╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ 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🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭a40064bb..╮ a40064bb.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (599) user
╭────╮ ╭ clone ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╮ │http│ ssh │ │ ╰────╯ ╰ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╯
.. embed/ event/ test/ ui/ command.zig diff3.zig event.zig find.zig fork.zig lib.zig main.zig main_wasm.zig markdown.zig patch.zig progress.zig push.zig search.zig search_commit.zig search_thread.zig serve.zig serve_common.zig serve_http.zig serve_ssh.zig serve_ssh_protocol.zig test.zig testnet.zig try.zig ui.zig ╭─────────────────────────────────╮ │web.zig │ ╰─────────────────────────────────╯
756 result catch |err| { 757 if (kind != .patch) return err; 758 const failure = ui.Session.FormFeedback.PatchFailure.fromError(err) orelse return err; 759 const form_location = try std.fmt.allocPrint(allocator, "{s}/patches/new", .{base}); 760 defer allocator.free(form_location); 761 return respondThreadFormFailure(request, allocator, host, form_location, patchFeedback(failure, title, labels, description, target_branch, source_branch)); 762 }; 763 }, 764 } 765 }, 766 } 767 } 768 769 const location = try std.fmt.allocPrint(allocator, "{s}/{s}:{s}", .{ base, @tagName(kind), &event_id_hex }); 770 defer allocator.free(location); 771 try request.respond("", .{ 772 .status = .see_other, 773 .extra_headers = &.{.{ .name = "location", .value = location }}, 774 }); 775 } 776 777 const CommentBaseParts = struct { 778 repo_base: []const u8, 779 thread_kind: evt.EventKind, 780 thread_id: [evt.event_id_size]u8, 781 comment_id: ?[evt.event_id_size]u8, 782 }; 783 784 fn commentBaseParts(base: []const u8) ?CommentBaseParts { 785 const route = ui.RoutablePage.fromUrl(base) orelse ui.RoutablePage.fromUrlLocal(base) orelse return null; 786 const identity, const thread_kind, const thread_hex, const comment_hex = switch (route) { 787 .repo_issues => |*issue| .{ issue.name.slice(), evt.EventKind.issue, issue.selected.slice(), issue.comment.slice() }, 788 .repo_patches => |*patch| .{ patch.name.slice(), evt.EventKind.patch, patch.selected.slice(), patch.comment.slice() }, 789 .repo_discussions => |*discussion| .{ discussion.name.slice(), evt.EventKind.discuss, discussion.selected.slice(), discussion.comment.slice() }, 790 else => return null, 791 }; 792 const thread_id = evt.parseEventId(thread_hex) catch return null; 793 const comment_id = if (comment_hex.len == 0) null else evt.parseEventId(comment_hex) catch return null; 794 const repo_base_len = if (identity.len == 0) 0 else "/repo/".len + identity.len; 795 return .{ .repo_base = base[0..repo_base_len], .thread_kind = thread_kind, .thread_id = thread_id, .comment_id = comment_id }; 796 } 797 798 fn handlePatchPublish( 799 io: std.Io, 800 request: *std.http.Server.Request, 801 allocator: std.mem.Allocator, 802 base: []const u8, 803 host: Host, 804 ) !void { 805 const parts = commentBaseParts(base) orelse return respondRemoveNotFound(request); 806 if (parts.thread_kind != .patch or parts.comment_id != null) return respondRemoveNotFound(request); 807 const server = switch (host) { 808 .server => |server| server, 809 .local => return respondRemoveNotFound(request), 810 }; 811 var author_arena = std.heap.ArenaAllocator.init(allocator); 812 defer author_arena.deinit(); 813 // only the draft's author may publish it, which publish checks 814 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return; 815 const user_id = actor.user_id orelse return respondLoginRequired(request); 816 const author = actor.author; 817 818 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 819 defer request_repo.deinit(allocator); 820 const repo_id = evt.parseEventId(std.fs.path.basename(request_repo.source.path)) catch return respondRemoveNotFound(request); 821 var target_repo = try rp.Repo(.xit, .{}).open(io, allocator, request_repo.source.localInitOpts()); 822 defer target_repo.deinit(io, allocator); 823 var admin_repo = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = server.admin_repo_path }); 824 defer admin_repo.deinit(io, allocator); 825 const id = std.fmt.bytesToHex(parts.thread_id, .lower); 826 try pch.publish(.{}, io, allocator, server.users_dir, &admin_repo, &target_repo, .{ 827 .id = id, 828 .user_id = user_id, 829 .repo_id = repo_id, 830 .author = author, 831 .timestamp = @intCast(std.Io.Timestamp.now(io, .real).toSeconds()), 832 }); 833 try request.respond("", .{ 834 .status = .see_other, 835 .extra_headers = &.{.{ .name = "location", .value = base }}, 836 }); 837 } 838 839 fn handlePatchMerge( 840 io: std.Io, 841 request: *std.http.Server.Request, 842 allocator: std.mem.Allocator, 843 base: []const u8, 844 host: Host, 845 revision: evt.Patch.MergeRevision, 846 ) !void { 847 const parts = commentBaseParts(base) orelse return respondRemoveNotFound(request); 848 if (parts.thread_kind != .patch or parts.comment_id != null) return respondRemoveNotFound(request); 849 const server = switch (host) { 850 .server => |server| server, 851 .local => return respondRemoveNotFound(request), 852 }; 853 var author_arena = std.heap.ArenaAllocator.init(allocator); 854 defer author_arena.deinit(); 855 const author = ((try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .write)) orelse return).author; 856 857 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 858 defer request_repo.deinit(allocator); 859 var target_repo = try rp.Repo(.xit, .{}).open(io, allocator, request_repo.source.localInitOpts()); 860 defer target_repo.deinit(io, allocator); 861 862 const id = std.fmt.bytesToHex(parts.thread_id, .lower); 863 pch.mergeAndRemoveFork(.{}, io, allocator, server.users_dir, &target_repo, .{ 864 .id = id, 865 .revision = revision, 866 .author = author, 867 .timestamp = @intCast(std.Io.Timestamp.now(io, .real).toSeconds()), 868 }) catch |err| switch (err) { 869 error.MergeConflict => return request.respond("merge conflict", .{ 870 .status = .conflict, 871 .keep_alive = false, 872 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 873 }), 874 error.MergeCheckUnavailable, error.PatchOutOfDate, error.PatchDataUnavailable => {}, 875 else => return err, 876 }; 877 878 const location = try std.fmt.allocPrint(allocator, "{s}/patch:{s}", .{ parts.repo_base, &id }); 879 defer allocator.free(location); 880 try request.respond("", .{ 881 .status = .see_other, 882 .keep_alive = false, 883 .extra_headers = &.{.{ .name = "location", .value = location }}, 884 }); 885 } 886 887 // create a reply and redirect to its permalink. 888 fn handleCommentNew( 889 io: std.Io, 890 request: *std.http.Server.Request, 891 allocator: std.mem.Allocator, 892 base: []const u8, 893 host: Host, 894 ) !void { 895 const not_found = "comment parent not found"; 896 const parts = commentBaseParts(base) orelse { 897 try request.respond(not_found, .{ 898 .status = .not_found, 899 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 900 }); 901 return; 902 }; 903 904 var author_arena = std.heap.ArenaAllocator.init(allocator); 905 defer author_arena.deinit(); 906 const author = ((try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return).author; 907 908 const form_body = try readFormBody(request, allocator); 909 defer allocator.free(form_body); 910 const body_crlf = (try parseFormField(allocator, form_body, "body")) orelse try allocator.dupe(u8, ""); 911 defer allocator.free(body_crlf); 912 const body = try std.mem.replaceOwned(u8, allocator, body_crlf, "\r\n", "\n"); 913 defer allocator.free(body); 914 915 if (!evt.Comment.fieldsValid(body)) { 916 const form_location = try std.fmt.allocPrint(allocator, "{s}/new", .{base}); 917 defer allocator.free(form_location); 918 try request.respond("", .{ 919 .status = .see_other, 920 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 921 }); 922 return; 923 } 924 925 const thread_id_hex = std.fmt.bytesToHex(parts.thread_id, .lower); 926 const parent_id_hex = std.fmt.bytesToHex(parts.comment_id orelse parts.thread_id, .lower); 927 928 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse { 929 try request.respond(not_found, .{ 930 .status = .not_found, 931 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 932 }); 933 return; 934 }; 935 defer request_repo.deinit(allocator); 936 const source = request_repo.source; 937 var event_id_hex: [evt.event_id_size * 2]u8 = undefined; 938 switch (source.repo_kind) { 939 inline else => |repo_kind| { 940 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 941 defer any_repo.deinit(io, allocator); 942 switch (any_repo) { 943 inline else => |*repo| event_id_hex = try evt.Comment.create(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, &thread_id_hex, &parent_id_hex, body, author), 944 } 945 }, 946 } 947 948 const location = try std.fmt.allocPrint(allocator, "{s}/{s}:{s}/comment:{s}", .{ parts.repo_base, @tagName(parts.thread_kind), &thread_id_hex, &event_id_hex }); 949 defer allocator.free(location); 950 try request.respond("", .{ 951 .status = .see_other, 952 .extra_headers = &.{.{ .name = "location", .value = location }}, 953 }); 954 } 955 956 const AttachmentRequest = struct { 957 repo_base: []const u8, 958 id: [evt.event_id_size]u8, 959 }; 960 961 // an attachment url is its repo's base and the attachment's event id 962 fn attachmentRequest(path: []const u8) ?AttachmentRequest { 963 const infix = "/attachment:"; 964 const at = std.mem.lastIndexOf(u8, path, infix) orelse return null; 965 const tail = path[at + infix.len ..]; 966 const id = evt.parseEventId(tail) catch return null; 967 return .{ .repo_base = path[0..at], .id = id }; 968 } 969 970 // serve an attachment's bytes from the repo its url names 971 fn serveAttachment( 972 io: std.Io, 973 request: *std.http.Server.Request, 974 allocator: std.mem.Allocator, 975 attachment: AttachmentRequest, 976 host: Host, 977 ) !void { 978 if (!try mayRead(io, allocator, request, host, attachment.repo_base)) return respondAttachmentNotFound(request); 979 const request_repo = (try requestRepoSource(io, allocator, host, attachment.repo_base)) orelse return respondAttachmentNotFound(request); 980 defer request_repo.deinit(allocator); 981 const source = request_repo.source; 982 switch (source.repo_kind) { 983 inline else => |repo_kind| { 984 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 985 defer any_repo.deinit(io, allocator); 986 switch (any_repo) { 987 inline else => |*repo| try sendAttachment(repo_kind, repo.self_repo_opts, io, request, allocator, repo, &attachment.id), 988 } 989 }, 990 } 991 } 992 993 fn sendAttachment( 994 comptime repo_kind: rp.RepoKind, 995 comptime repo_opts: rp.RepoOpts(repo_kind), 996 io: std.Io, 997 request: *std.http.Server.Request, 998 allocator: std.mem.Allocator, 999 repo: *rp.Repo(repo_kind, repo_opts), 1000 id: *const [evt.event_id_size]u8, 1001 ) !void { 1002 var arena = std.heap.ArenaAllocator.init(allocator); 1003 defer arena.deinit(); 1004 1005 const DB = evt.EventDB(repo_opts.hash); 1006 var event_db_maybe: ?evt.LocalEventDB(repo_opts.hash) = if (repo_kind == .git) try evt.LocalEventDB(repo_opts.hash).openReadOnly(io, allocator, repo.core.repo_dir) else null; 1007 defer if (event_db_maybe) |*event_db| event_db.deinit(io, allocator); 1008 const haxy_moment = (if (event_db_maybe) |*event_db| 1009 evt.currentMomentFromDb(repo_opts.hash, event_db.db) 1010 else if (repo_kind == .git) 1011 return respondAttachmentNotFound(request) 1012 else 1013 evt.currentMoment(repo_opts, repo)) catch return respondAttachmentNotFound(request); 1014 1015 const record = (try evt.Attachment.readById(DB, repo_opts.hash, haxy_moment, &arena, id)) orelse return respondAttachmentNotFound(request); 1016 if (record.removed) return respondAttachmentNotFound(request); 1017 if (record.blob_oid.len != hash.hexLen(repo_opts.hash)) return respondAttachmentNotFound(request); 1018 const blob_oid: *const [hash.hexLen(repo_opts.hash)]u8 = @ptrCast(record.blob_oid.ptr); 1019 1020 var moment = repo.core.latestMoment() catch return respondAttachmentNotFound(request); 1021 const state = rp.Repo(repo_kind, repo_opts).State(.read_only){ .core = &repo.core, .extra = .{ .moment = &moment } }; 1022 var object_reader = obj.ObjectReader(repo_kind, repo_opts).init(state, io, allocator, blob_oid) catch return respondAttachmentNotFound(request); 1023 defer object_reader.deinit(); 1024 if (object_reader.header().kind != .blob) return respondAttachmentNotFound(request); 1025 1026 const content_type = attachmentContentType(record.name); 1027 const encoded_name = try ui.urlEncodeRef(allocator, record.name); 1028 defer allocator.free(encoded_name); 1029 const disposition = try std.fmt.allocPrint(allocator, "{s}; filename*=UTF-8''{s}", .{ if (content_type == null) "attachment" else "inline", encoded_name }); 1030 defer allocator.free(disposition); 1031 1032 var send_buf: [8192]u8 = undefined; 1033 var body = try request.respondStreaming(&send_buf, .{ 1034 .content_length = object_reader.header().size, 1035 .respond_options = .{ 1036 .extra_headers = &.{ 1037 .{ .name = "content-type", .value = content_type orelse "application/octet-stream" }, 1038 .{ .name = "content-disposition", .value = disposition }, 1039 // uploaded bytes are never sniffed into a type that could run 1040 // as script on this origin 1041 .{ .name = "x-content-type-options", .value = "nosniff" }, 1042 }, 1043 }, 1044 }); 1045 _ = try object_reader.interface.streamRemaining(&body.writer); 1046 try body.end(); 1047 } 1048 1049 // the images a browser renders safely inline. anything else downloads as 1050 // opaque bytes, so an uploaded page can't run on this origin. 1051 fn attachmentContentType(name: []const u8) ?[]const u8 { 1052 const types = [_]struct { ext: []const u8, value: []const u8 }{ 1053 .{ .ext = ".png", .value = "image/png" }, 1054 .{ .ext = ".jpg", .value = "image/jpeg" }, 1055 .{ .ext = ".jpeg", .value = "image/jpeg" }, 1056 .{ .ext = ".gif", .value = "image/gif" }, 1057 .{ .ext = ".webp", .value = "image/webp" }, 1058 }; 1059 for (types) |entry| { 1060 if (name.len > entry.ext.len and std.ascii.eqlIgnoreCase(name[name.len - entry.ext.len ..], entry.ext)) return entry.value; 1061 } 1062 return null; 1063 } 1064 1065 fn respondAttachmentNotFound(request: *std.http.Server.Request) !void { 1066 try request.respond("attachment not found", .{ 1067 .status = .not_found, 1068 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1069 }); 1070 } 1071 1072 fn respondAttachmentParentNotFound(request: *std.http.Server.Request) !void { 1073 try request.respond("attachment parent not found", .{ 1074 .status = .not_found, 1075 .keep_alive = false, 1076 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1077 }); 1078 } 1079 1080 // the upload declares its file's name here, since the body is the file itself 1081 const attachment_name_header = "x-attachment-name"; 1082 1083 const AttachParentParts = struct { 1084 repo_base: []const u8, 1085 kind: evt.EventKind, 1086 id_bytes: [evt.event_id_size]u8, 1087 }; 1088 1089 // what an attachment hangs off: the `<kind>:<id>` segment the form's page ends 1090 // with, whatever kind that is 1091 fn attachParentParts(base: []const u8) ?AttachParentParts { 1092 const segment_at = std.mem.lastIndexOfScalar(u8, base, '/') orelse return null; 1093 const segment = base[segment_at + 1 ..]; 1094 const colon_at = std.mem.lastIndexOfScalar(u8, segment, ':') orelse return null; 1095 const kind = std.meta.stringToEnum(evt.EventKind, segment[0..colon_at]) orelse return null; 1096 const id_bytes = evt.parseEventId(segment[colon_at + 1 ..]) catch return null; 1097 return .{ .repo_base = base[0..segment_at], .kind = kind, .id_bytes = id_bytes }; 1098 } 1099 1100 // attach the uploaded file to the event the url names, then reload. the file is 1101 // the whole request body, so it streams from the socket into the object store 1102 // without being buffered. 1103 fn handleAttach( 1104 io: std.Io, 1105 request: *std.http.Server.Request, 1106 allocator: std.mem.Allocator, 1107 base: []const u8, 1108 host: Host, 1109 ) !void { 1110 const parts = attachParentParts(base) orelse return respondAttachmentParentNotFound(request); 1111 1112 var author_arena = std.heap.ArenaAllocator.init(allocator); 1113 defer author_arena.deinit(); 1114 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return; 1115 const author = actor.author; 1116 // an attachment changes the event it hangs off 1117 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondAttachmentParentNotFound(request); 1118 defer request_repo.deinit(allocator); 1119 const source = request_repo.source; 1120 if (!try source.canModify(io, allocator, actor, parts.kind, &parts.id_bytes)) return respondForbidden(request); 1121 1122 const name = (try attachmentName(allocator, request)) orelse return respondUploadError(request, .bad_request, "attachment needs a name"); 1123 defer allocator.free(name); 1124 if (!evt.Attachment.nameValid(name)) return respondUploadError(request, .bad_request, "invalid attachment name"); 1125 1126 const size = request.head.content_length orelse return respondUploadError(request, .length_required, "attachments must declare a content length"); 1127 if (size == 0) return respondUploadError(request, .bad_request, "attachment is empty"); 1128 if (size > evt.Attachment.max_size) return respondUploadError(request, .payload_too_large, "attachment is too large"); 1129 1130 const parent_id_hex = std.fmt.bytesToHex(parts.id_bytes, .lower); 1131 1132 var body_buf: [4096]u8 = undefined; 1133 const blob: evt.Blob = .{ .name = name, .size = size, .reader = try request.readerExpectContinue(&body_buf) }; 1134 1135 switch (source.repo_kind) { 1136 inline else => |repo_kind| { 1137 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1138 defer any_repo.deinit(io, allocator); 1139 switch (any_repo) { 1140 inline else => |*repo| _ = evt.Attachment.create(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, &parent_id_hex, blob, author) catch |err| switch (err) { 1141 error.ParentNotFound => return respondAttachmentParentNotFound(request), 1142 else => return err, 1143 }, 1144 } 1145 }, 1146 } 1147 1148 // the client reloads the page itself 1149 try request.respond("", .{ .status = .no_content, .keep_alive = false }); 1150 } 1151 1152 // the name the upload declares for its file, percent-encoded so it survives a 1153 // header 1154 fn attachmentName(allocator: std.mem.Allocator, request: *std.http.Server.Request) !?[]u8 { 1155 var iter = request.iterateHeaders(); 1156 while (iter.next()) |header| { 1157 if (!std.ascii.eqlIgnoreCase(header.name, attachment_name_header)) continue; 1158 return try decodeFormValue(allocator, header.value); 1159 } 1160 return null; 1161 } 1162 1163 // an upload that failed leaves the body partly read, so the connection closes 1164 fn respondUploadError(request: *std.http.Server.Request, status: std.http.Status, message: []const u8) !void { 1165 try request.respond(message, .{ 1166 .status = status, 1167 .keep_alive = false, 1168 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1169 }); 1170 } 1171 1172 // re-emit the comment `parts` names with a new body, in the repo the host 1173 // resolves the base to. 1174 fn updateComment( 1175 io: std.Io, 1176 allocator: std.mem.Allocator, 1177 host: Host, 1178 parts: CommentBaseParts, 1179 body: []const u8, 1180 author: evt.CommitAuthor, 1181 ) !void { 1182 const comment_id = parts.comment_id orelse return error.NotFound; 1183 const thread_id = std.fmt.bytesToHex(parts.thread_id, .lower); 1184 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return error.NotFound; 1185 defer request_repo.deinit(allocator); 1186 const source = request_repo.source; 1187 switch (source.repo_kind) { 1188 inline else => |repo_kind| { 1189 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1190 defer any_repo.deinit(io, allocator); 1191 switch (any_repo) { 1192 inline else => |*repo| try evt.Comment.update(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, &thread_id, &comment_id, body, author), 1193 } 1194 }, 1195 } 1196 } 1197 1198 // edit actions share a suffix; the base identifies the event being edited. 1199 fn handleEdit( 1200 io: std.Io, 1201 request: *std.http.Server.Request, 1202 allocator: std.mem.Allocator, 1203 base: []const u8, 1204 host: Host, 1205 ) !void { 1206 const parts = commentBaseParts(base) orelse return respondRemoveNotFound(request); 1207 if (parts.comment_id != null) return handleCommentEdit(io, request, allocator, base, host, parts); 1208 return handleThreadEdit(io, request, allocator, base, host, parts); 1209 } 1210 1211 // replace the body of the comment the url names, then redirect to its 1212 // permalink. 1213 fn handleCommentEdit( 1214 io: std.Io, 1215 request: *std.http.Server.Request, 1216 allocator: std.mem.Allocator, 1217 base: []const u8, 1218 host: Host, 1219 parts: CommentBaseParts, 1220 ) !void { 1221 var author_arena = std.heap.ArenaAllocator.init(allocator); 1222 defer author_arena.deinit(); 1223 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return; 1224 const author = actor.author; 1225 // edits only reach here for a comment 1226 const comment_id = parts.comment_id orelse unreachable; 1227 { 1228 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1229 defer request_repo.deinit(allocator); 1230 if (!try request_repo.source.canModify(io, allocator, actor, .comment, &comment_id)) return respondForbidden(request); 1231 } 1232 1233 const form_body = try readFormBody(request, allocator); 1234 defer allocator.free(form_body); 1235 const body_crlf = (try parseFormField(allocator, form_body, "body")) orelse try allocator.dupe(u8, ""); 1236 defer allocator.free(body_crlf); 1237 const body = try std.mem.replaceOwned(u8, allocator, body_crlf, "\r\n", "\n"); 1238 defer allocator.free(body); 1239 1240 if (!evt.Comment.fieldsValid(body)) { 1241 const form_location = try std.fmt.allocPrint(allocator, "{s}/edit", .{base}); 1242 defer allocator.free(form_location); 1243 try request.respond("", .{ 1244 .status = .see_other, 1245 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 1246 }); 1247 return; 1248 } 1249 1250 const not_found = "comment not found"; 1251 updateComment(io, allocator, host, parts, body, author) catch |err| switch (err) { 1252 error.NotFound => { 1253 try request.respond(not_found, .{ 1254 .status = .not_found, 1255 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1256 }); 1257 return; 1258 }, 1259 else => |e| return e, 1260 }; 1261 1262 try request.respond("", .{ 1263 .status = .see_other, 1264 .extra_headers = &.{.{ .name = "location", .value = base }}, 1265 }); 1266 } 1267 1268 fn updateThread( 1269 comptime Event: type, 1270 io: std.Io, 1271 allocator: std.mem.Allocator, 1272 host: Host, 1273 repo_base: []const u8, 1274 id: *const [evt.event_id_size]u8, 1275 update: Event.Update, 1276 author: evt.CommitAuthor, 1277 ) !void { 1278 const request_repo = (try requestRepoSource(io, allocator, host, repo_base)) orelse return error.NotFound; 1279 defer request_repo.deinit(allocator); 1280 const source = request_repo.source; 1281 switch (source.repo_kind) { 1282 inline else => |repo_kind| { 1283 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1284 defer any_repo.deinit(io, allocator); 1285 switch (any_repo) { 1286 inline else => |*repo| try Event.update(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, id, update, author), 1287 } 1288 }, 1289 } 1290 } 1291 1292 const RemoveParts = struct { 1293 repo_base: []const u8, 1294 kind: evt.EventKind, 1295 id: [evt.event_id_size]u8, 1296 }; 1297 1298 // split a remove url into the repo and event it names 1299 fn removeParts(base: []const u8) ?RemoveParts { 1300 if (attachmentRequest(base)) |attachment| { 1301 const parent = attachParentParts(attachment.repo_base) orelse return null; 1302 return .{ 1303 .repo_base = parent.repo_base, 1304 .kind = .attach, 1305 .id = attachment.id, 1306 }; 1307 } 1308 if (commentBaseParts(base)) |thread| return .{ 1309 .repo_base = thread.repo_base, 1310 .kind = if (thread.comment_id != null) .comment else thread.thread_kind, 1311 .id = thread.comment_id orelse thread.thread_id, 1312 }; 1313 return null; 1314 } 1315 1316 // remove the event named by the form's url 1317 fn handleRemove( 1318 io: std.Io, 1319 request: *std.http.Server.Request, 1320 allocator: std.mem.Allocator, 1321 base: []const u8, 1322 host: Host, 1323 ) !void { 1324 const parts = removeParts(base) orelse return respondRemoveNotFound(request); 1325 1326 var author_arena = std.heap.ArenaAllocator.init(allocator); 1327 defer author_arena.deinit(); 1328 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return; 1329 const author = actor.author; 1330 1331 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1332 defer request_repo.deinit(allocator); 1333 const source = request_repo.source; 1334 1335 if (parts.kind == .patch) switch (host) { 1336 .server => |server| { 1337 const user_id = actor.user_id orelse return respondLoginRequired(request); 1338 1339 // a draft lives in its author's user repo 1340 if (try evt.readForkById(io, allocator, &author_arena, server.users_dir, &user_id, &parts.id)) |fork_record| { 1341 const repo_id = evt.parseEventId(std.fs.path.basename(source.path)) catch return respondRemoveNotFound(request); 1342 if (!fork_record.removed and fork_record.event.stage == .draft and std.mem.eql(u8, fork_record.event.repo_id, &repo_id)) { 1343 const id = std.fmt.bytesToHex(parts.id, .lower); 1344 try fork.remove(io, allocator, server.users_dir, &user_id, &id, author); 1345 1346 const location = try std.fmt.allocPrint(allocator, "{s}/patches/drafts", .{parts.repo_base}); 1347 defer allocator.free(location); 1348 try request.respond("", .{ 1349 .status = .see_other, 1350 .keep_alive = false, 1351 .extra_headers = &.{.{ .name = "location", .value = location }}, 1352 }); 1353 return; 1354 } 1355 } 1356 }, 1357 .local => {}, 1358 }; 1359 1360 // a draft is its author's alone, which its removal above checks 1361 if (!try source.canModify(io, allocator, actor, parts.kind, &parts.id)) return respondForbidden(request); 1362 1363 switch (source.repo_kind) { 1364 inline else => |repo_kind| { 1365 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1366 defer any_repo.deinit(io, allocator); 1367 switch (any_repo) { 1368 inline else => |*repo| evt.remove(host.event(), .repo, repo_kind, repo.self_repo_opts, io, allocator, repo, &parts.id, parts.kind, author) catch |err| switch (err) { 1369 error.EventNotFound => return respondRemoveNotFound(request), 1370 else => |e| return e, 1371 }, 1372 } 1373 }, 1374 } 1375 1376 const id = std.fmt.bytesToHex(parts.id, .lower); 1377 const location = try std.fmt.allocPrint(allocator, "{s}/event:{s}/kind:{s}", .{ parts.repo_base, &id, @tagName(parts.kind) }); 1378 defer allocator.free(location); 1379 try request.respond("", .{ 1380 .status = .see_other, 1381 .keep_alive = false, 1382 .extra_headers = &.{.{ .name = "location", .value = location }}, 1383 }); 1384 } 1385 1386 fn respondRemoveNotFound(request: *std.http.Server.Request) !void { 1387 try request.respond("event not found", .{ 1388 .status = .not_found, 1389 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1390 }); 1391 } 1392 1393 fn updateDiscussion( 1394 io: std.Io, 1395 allocator: std.mem.Allocator, 1396 host: Host, 1397 repo_base: []const u8, 1398 id: *const [evt.event_id_size]u8, 1399 title: []const u8, 1400 labels: []const u8, 1401 description: []const u8, 1402 author: evt.CommitAuthor, 1403 ) !void { 1404 const request_repo = (try requestRepoSource(io, allocator, host, repo_base)) orelse return error.NotFound; 1405 defer request_repo.deinit(allocator); 1406 const source = request_repo.source; 1407 switch (source.repo_kind) { 1408 inline else => |repo_kind| { 1409 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1410 defer any_repo.deinit(io, allocator); 1411 switch (any_repo) { 1412 inline else => |*repo| try evt.Discussion.update(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, id, title, labels, description, author), 1413 } 1414 }, 1415 } 1416 } 1417 1418 // set the status of the issue the url names (base is 1419 // "/repo/<owner>/<name>/issue:<id>", identity elided in local mode) by 1420 // re-emitting its event, then redirect back to it 1421 fn handleThreadStatus( 1422 io: std.Io, 1423 request: *std.http.Server.Request, 1424 allocator: std.mem.Allocator, 1425 base: []const u8, 1426 host: Host, 1427 open: bool, 1428 ) !void { 1429 const not_found = "thread not found"; 1430 const parts = commentBaseParts(base) orelse { 1431 try request.respond(not_found, .{ 1432 .status = .not_found, 1433 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1434 }); 1435 return; 1436 }; 1437 1438 var author_arena = std.heap.ArenaAllocator.init(allocator); 1439 defer author_arena.deinit(); 1440 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return; 1441 const author = actor.author; 1442 { 1443 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1444 defer request_repo.deinit(allocator); 1445 if (!try request_repo.source.canModify(io, allocator, actor, parts.thread_kind, &parts.thread_id)) return respondForbidden(request); 1446 } 1447 1448 (switch (parts.thread_kind) { 1449 .issue => updateThread(evt.Issue, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .status = if (open) .open else .closed }, author), 1450 .patch => updateThread(evt.Patch, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .status = if (open) .open else .closed }, author), 1451 else => return respondRemoveNotFound(request), 1452 }) catch |err| switch (err) { 1453 error.NotFound => { 1454 try request.respond(not_found, .{ 1455 .status = .not_found, 1456 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1457 }); 1458 return; 1459 }, 1460 else => |e| return e, 1461 }; 1462 1463 // like logout, this is a bodyless POST, so close the connection rather than 1464 // letting the keep-alive path try to discard a body that isn't framed. 1465 try request.respond("", .{ 1466 .status = .see_other, 1467 .keep_alive = false, 1468 .extra_headers = &.{.{ .name = "location", .value = base }}, 1469 }); 1470 } 1471 1472 // replace a thread's editable fields. 1473 fn handleThreadEdit( 1474 io: std.Io, 1475 request: *std.http.Server.Request, 1476 allocator: std.mem.Allocator, 1477 base: []const u8, 1478 host: Host, 1479 parts: CommentBaseParts, 1480 ) !void { 1481 var author_arena = std.heap.ArenaAllocator.init(allocator); 1482 defer author_arena.deinit(); 1483 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return; 1484 const author = actor.author; 1485 1486 const body = try readFormBody(request, allocator); 1487 defer allocator.free(body); 1488 1489 const title = (try parseFormField(allocator, body, "title")) orelse try allocator.dupe(u8, ""); 1490 defer allocator.free(title); 1491 const labels = (try parseFormField(allocator, body, "labels")) orelse try allocator.dupe(u8, ""); 1492 defer allocator.free(labels); 1493 const description_crlf = (try parseFormField(allocator, body, "description")) orelse try allocator.dupe(u8, ""); 1494 defer allocator.free(description_crlf); 1495 // form submission normalizes textarea line breaks to CRLF; store plain 1496 // newlines so the text renders the same on every host 1497 const description = try std.mem.replaceOwned(u8, allocator, description_crlf, "\r\n", "\n"); 1498 defer allocator.free(description); 1499 const target_branch = (try parseFormField(allocator, body, "target_branch")) orelse try allocator.dupe(u8, ""); 1500 defer allocator.free(target_branch); 1501 1502 // invalid fields send the user back to the edit form 1503 const valid = switch (parts.thread_kind) { 1504 .issue => evt.Issue.fieldsValid(title, labels), 1505 .patch => evt.Patch.fieldsValid(title, labels), 1506 .discuss => evt.Discussion.fieldsValid(title, labels), 1507 else => unreachable, 1508 }; 1509 if (!valid) { 1510 const form_location = try std.fmt.allocPrint(allocator, "{s}/edit", .{base}); 1511 defer allocator.free(form_location); 1512 if (!evt.titleValid(title)) { 1513 return respondThreadFormFailure(request, allocator, host, form_location, requiredTitleFeedback(parts.thread_kind, title, labels, description, target_branch, null)); 1514 } 1515 try request.respond("", .{ 1516 .status = .see_other, 1517 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 1518 }); 1519 return; 1520 } 1521 1522 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1523 defer request_repo.deinit(allocator); 1524 1525 const draft_user_id = if (parts.thread_kind == .patch) actor.user_id else null; 1526 if (draft_user_id) |user_id| { 1527 const server = switch (host) { 1528 .server => |server| server, 1529 .local => unreachable, 1530 }; 1531 if (!evt.Patch.branchValid(target_branch) or !try request_repo.source.hasBranch(io, allocator, target_branch)) { 1532 const form_location = try std.fmt.allocPrint(allocator, "{s}/edit", .{base}); 1533 defer allocator.free(form_location); 1534 return respondThreadFormFailure(request, allocator, host, form_location, patchFeedback(.invalid_target_branch, title, labels, description, target_branch, null)); 1535 } 1536 const repo_id = evt.parseEventId(std.fs.path.basename(request_repo.source.path)) catch return respondRemoveNotFound(request); 1537 var admin_repo = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = server.admin_repo_path }); 1538 defer admin_repo.deinit(io, allocator); 1539 const id = std.fmt.bytesToHex(parts.thread_id, .lower); 1540 if (try pch.editDraft(.{}, io, allocator, server.users_dir, &admin_repo, .{ 1541 .id = id, 1542 .user_id = user_id, 1543 .repo_id = repo_id, 1544 .title = title, 1545 .labels = labels, 1546 .description = description, 1547 .target_branch = target_branch, 1548 .author = author, 1549 .timestamp = @intCast(std.Io.Timestamp.now(io, .real).toSeconds()), 1550 })) { 1551 try request.respond("", .{ 1552 .status = .see_other, 1553 .extra_headers = &.{.{ .name = "location", .value = base }}, 1554 }); 1555 return; 1556 } 1557 } 1558 1559 // a draft is its author's alone, which its edit above checks 1560 if (!try request_repo.source.canModify(io, allocator, actor, parts.thread_kind, &parts.thread_id)) return respondForbidden(request); 1561 1562 const not_found = switch (parts.thread_kind) { 1563 .issue => "issue not found", 1564 .patch => "patch not found", 1565 .discuss => "discussion not found", 1566 else => unreachable, 1567 }; 1568 (switch (parts.thread_kind) { 1569 .issue => updateThread(evt.Issue, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .fields = .{ 1570 .title = title, 1571 .labels = labels, 1572 .description = description, 1573 } }, author), 1574 .patch => updateThread(evt.Patch, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .fields = .{ 1575 .title = title, 1576 .labels = labels, 1577 .description = description, 1578 .target_branch = target_branch, 1579 } }, author), 1580 .discuss => updateDiscussion(io, allocator, host, parts.repo_base, &parts.thread_id, title, labels, description, author), 1581 else => unreachable, 1582 }) catch |err| switch (err) { 1583 error.NotFound => { 1584 try request.respond(not_found, .{ 1585 .status = .not_found, 1586 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1587 }); 1588 return; 1589 }, 1590 else => { 1591 if (parts.thread_kind != .patch) return err; 1592 const failure = ui.Session.FormFeedback.PatchFailure.fromError(err) orelse return err; 1593 const form_location = try std.fmt.allocPrint(allocator, "{s}/edit", .{base}); 1594 defer allocator.free(form_location); 1595 return respondThreadFormFailure(request, allocator, host, form_location, patchFeedback(failure, title, labels, description, target_branch, null)); 1596 }, 1597 }; 1598 1599 try request.respond("", .{ 1600 .status = .see_other, 1601 .extra_headers = &.{.{ .name = "location", .value = base }}, 1602 }); 1603 } 1604 1605 // resolve every conflicted field of the thread the url names 1606 fn handleThreadResolve( 1607 io: std.Io, 1608 request: *std.http.Server.Request, 1609 allocator: std.mem.Allocator, 1610 base: []const u8, 1611 host: Host, 1612 ) !void { 1613 const parts = commentBaseParts(base) orelse { 1614 try request.respond("thread not found", .{ 1615 .status = .not_found, 1616 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1617 }); 1618 return; 1619 }; 1620 1621 var author_arena = std.heap.ArenaAllocator.init(allocator); 1622 defer author_arena.deinit(); 1623 const author = ((try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .write)) orelse return).author; 1624 1625 const body = try readFormBody(request, allocator); 1626 defer allocator.free(body); 1627 1628 var field_arena = std.heap.ArenaAllocator.init(allocator); 1629 defer field_arena.deinit(); 1630 const aa = field_arena.allocator(); 1631 const title = try parseFormField(aa, body, "title"); 1632 const labels = try parseFormField(aa, body, "labels"); 1633 1634 // the hunk inputs are submitted as d0, d1, ...; form submission normalizes their 1635 // textarea line breaks to CRLF 1636 var hunks: std.ArrayList([]const u8) = .empty; 1637 var hunk_index: usize = 0; 1638 while (true) : (hunk_index += 1) { 1639 const name = try std.fmt.allocPrint(aa, "d{d}", .{hunk_index}); 1640 const submitted = (try parseFormField(aa, body, name)) orelse break; 1641 try hunks.append(aa, try std.mem.replaceOwned(u8, aa, submitted, "\r\n", "\n")); 1642 } 1643 1644 if (parts.comment_id != null or (parts.thread_kind != .issue and parts.thread_kind != .patch)) { 1645 try request.respond("thread not found", .{ 1646 .status = .not_found, 1647 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1648 }); 1649 return; 1650 } 1651 const route = ui.RoutablePage.fromUrl(base) orelse ui.RoutablePage.fromUrlLocal(base) orelse { 1652 try request.respond("thread not found", .{ 1653 .status = .not_found, 1654 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1655 }); 1656 return; 1657 }; 1658 const theirs: []const u8 = switch (route) { 1659 .repo_patches => |*patch| patch.theirs.slice(), 1660 .repo_issues => "", 1661 else => unreachable, 1662 }; 1663 const not_found = if (parts.thread_kind == .patch) "patch not found" else "issue not found"; 1664 1665 (switch (parts.thread_kind) { 1666 .issue => updateThread(evt.Issue, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .resolve = .{ 1667 .title = title, 1668 .labels = labels, 1669 .hunks = hunks.items, 1670 } }, author), 1671 .patch => updateThread(evt.Patch, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .resolve = .{ 1672 .title = title, 1673 .labels = labels, 1674 .hunks = hunks.items, 1675 .theirs = theirs, 1676 } }, author), 1677 else => unreachable, 1678 }) catch |err| switch (err) { 1679 error.NotFound => { 1680 try request.respond(not_found, .{ 1681 .status = .not_found, 1682 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1683 }); 1684 return; 1685 }, 1686 // invalid fields send the user back to the resolve form 1687 error.InvalidFields => { 1688 const form_location = try std.fmt.allocPrint(allocator, "{s}/resolve", .{base}); 1689 defer allocator.free(form_location); 1690 try request.respond("", .{ 1691 .status = .see_other, 1692 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 1693 }); 1694 return; 1695 }, 1696 else => |e| return e, 1697 }; 1698 1699 try request.respond("", .{ 1700 .status = .see_other, 1701 .extra_headers = &.{.{ .name = "location", .value = base }}, 1702 }); 1703 } 1704 1705 // the posted path drops the action's own segment, so the route it parses is 1706 // the undo page the action applies to, never the confirmation page itself 1707 fn handleUndo(io: std.Io, request: *std.http.Server.Request, allocator: std.mem.Allocator, base: []const u8, host: Host, action: enum { undo, clear }) !void { 1708 const route = (switch (host) { 1709 .local => ui.RoutablePage.fromUrlLocal(base), 1710 .server => ui.RoutablePage.fromUrl(base), 1711 }) orelse return respondRepoNotFound(request); 1712 if (route != .repo_undo) return respondRepoNotFound(request); 1713 const target = route.repo_undo; 1714 var arena = std.heap.ArenaAllocator.init(allocator); 1715 defer arena.deinit(); 1716 const repo_base = if (target.name.len == 0) "" else try std.fmt.allocPrint(arena.allocator(), "/repo/{s}", .{target.name.slice()}); 1717 _ = (try authorizeWrite(io, allocator, &arena, request, host, repo_base, .owner)) orelse return; 1718 const resolved = (try requestRepoSource(io, allocator, host, repo_base)) orelse return respondRepoNotFound(request); 1719 defer resolved.deinit(allocator); 1720 (switch (action) { 1721 .undo => ui.Repo.Undo.execute(io, allocator, resolved.source, target.index orelse return respondRepoNotFound(request)), 1722 .clear => ui.Repo.Undo.clearHistory(io, allocator, resolved.source), 1723 }) catch |err| switch (err) { 1724 error.NotFound, error.InvalidHistoryIndex, error.TransactionNotFound => return respondRepoNotFound(request), 1725 else => return err, 1726 }; 1727 const location = try (ui.RoutablePage.repoUndoRoute(target.name.slice(), null) orelse return error.RouteTooLong).toUrl(&arena); 1728 try request.respond("", .{ .status = .see_other, .keep_alive = false, .extra_headers = &.{.{ .name = "location", .value = location }} }); 1729 } 1730 1731 fn handleSync( 1732 io: std.Io, 1733 request: *std.http.Server.Request, 1734 allocator: std.mem.Allocator, 1735 base: []const u8, 1736 source: ui.RepoSource, 1737 ) !void { 1738 if (base.len != 0) { 1739 try request.respond("not found", .{ 1740 .status = .not_found, 1741 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1742 }); 1743 return; 1744 } 1745 1746 var owned_failure: ?[]u8 = null; 1747 defer if (owned_failure) |message| allocator.free(message); 1748 const failure: ?[]const u8 = blk: { 1749 owned_failure = ui.Repo.Events.sync(io, allocator, source) catch |err| break :blk @errorName(err); 1750 break :blk owned_failure; 1751 }; 1752 if (failure) |message| { 1753 var encoded: std.Io.Writer.Allocating = .init(allocator); 1754 defer encoded.deinit(); 1755 try std.Uri.Component.percentEncode(&encoded.writer, message, struct { 1756 fn isUnreserved(c: u8) bool { 1757 return std.ascii.isAlphanumeric(c) or c == '-' or c == '.' or c == '_' or c == '~'; 1758 } 1759 }.isUnreserved); 1760 const cookie = try std.fmt.allocPrint( 1761 allocator, 1762 local_flash_cookie ++ "=" ++ local_sync_failure_prefix ++ "{s}; Path=/; HttpOnly; SameSite=Strict", 1763 .{encoded.written()}, 1764 ); 1765 defer allocator.free(cookie); 1766 try request.respond("", .{ 1767 .status = .see_other, 1768 .extra_headers = &.{ 1769 .{ .name = "location", .value = "/events" }, 1770 .{ .name = "set-cookie", .value = cookie }, 1771 }, 1772 }); 1773 return; 1774 } 1775 1776 try request.respond("", .{ 1777 .status = .see_other, 1778 .extra_headers = &.{ 1779 .{ .name = "location", .value = "/events" }, 1780 .{ .name = "set-cookie", .value = local_flash_cookie ++ "=; Path=/; Max-Age=0" }, 1781 }, 1782 }); 1783 } 1784 1785 fn renderIndexHtml( 1786 io: std.Io, 1787 allocator: std.mem.Allocator, 1788 host: Host, 1789 session_token: ?[]const u8, 1790 session_data: ui.Session.Data, 1791 ) ![]const u8 { 1792 const template = (findEmbed("/index.html") orelse return error.MissingIndexAsset).body; 1793 1794 var page_arena = std.heap.ArenaAllocator.init(allocator); 1795 defer page_arena.deinit(); 1796 1797 // the server admin repo must outlive the page build, since the session's 1798 // moment reads from it. 1799 var repo_maybe: ?rp.Repo(.xit, evt.admin_repo_opts) = null; 1800 defer if (repo_maybe) |*repo| repo.deinit(io, allocator); 1801 1802 var session = switch (host) { 1803 .server => |server| blk: { 1804 // open the admin repo to read live user/repo data. 1805 repo_maybe = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = server.admin_repo_path }); 1806 const repo = if (repo_maybe) |*repo| repo else unreachable; 1807 var session = try ui.Session.init(&page_arena, repo, session_data); 1808 // the session dropped a user whose account was removed, so revoke 1809 // the token that named them 1810 if (session_token) |token| { 1811 if (session.data.user_id == null) server.session_store.remove(token); 1812 } 1813 // give the page builders filesystem access to the on-disk repos (a 1814 // sibling "users" dir next to the admin repo) so the Repo page can 1815 // read its files. 1816 session.users_dir = server.users_dir; 1817 break :blk session; 1818 }, 1819 .local => |local| ui.Session{ 1820 .data = session_data, 1821 .arena = &page_arena, 1822 .page_arena = &page_arena, 1823 .local = local, 1824 }, 1825 }; 1826 session.io = io; 1827 1828 var page = try ui.Page.init(session.page_arena, &session, session.data.current_page); 1829 var root = try ui.initRoot(allocator, &page, &session); 1830 defer root.deinit(allocator); 1831 1832 const snapshot: ui.Snapshot = .{ .page = page, .session = session.data }; 1833 1834 const content = try generateHtml(allocator, &root, &session); 1835 defer allocator.free(content); 1836 1837 // serialize the snapshot so the wasm side can parse it back without making 1838 // a second request. it's embedded raw in a <script type="application/json"> 1839 // block, whose content is raw text terminated only by "</script". in json, 1840 // '<' appears solely inside string values, so escaping every '<' (and '>' 1841 // for good measure) to its \uXXXX form yields equivalent json that can't 1842 // break out of the tag. 1843 var json: std.Io.Writer.Allocating = .init(allocator); 1844 defer json.deinit(); 1845 try std.json.Stringify.value(snapshot, .{}, &json.writer); 1846 1847 var json_escaped: std.ArrayList(u8) = .empty; 1848 defer json_escaped.deinit(allocator); 1849 for (json.written()) |c| switch (c) { 1850 '<' => try json_escaped.appendSlice(allocator, "\\u003c"), 1851 '>' => try json_escaped.appendSlice(allocator, "\\u003e"), 1852 else => try json_escaped.append(allocator, c), 1853 }; 1854 1855 var out: std.ArrayList(u8) = .empty; 1856 errdefer out.deinit(allocator); 1857 { 1858 var cursor: usize = 0; 1859 for (&[_]struct { needle: []const u8, replacement: []const u8 }{ 1860 .{ .needle = "{{{ HAXY_HTML }}}", .replacement = content }, 1861 .{ .needle = "{{{ HAXY_JSON }}}", .replacement = json_escaped.items }, 1862 }) |sub| { 1863 const idx = std.mem.indexOfPos(u8, template, cursor, sub.needle) orelse return error.MissingTemplateToken; 1864 try out.appendSlice(allocator, template[cursor..idx]); 1865 try out.appendSlice(allocator, sub.replacement); 1866 cursor = idx + sub.needle.len; 1867 } 1868 try out.appendSlice(allocator, template[cursor..]); 1869 } 1870 return try out.toOwnedSlice(allocator); 1871 } 1872 1873 fn findEmbed(request_path: []const u8) ?Embed { 1874 const path = if (std.mem.eql(u8, request_path, "/")) 1875 "index.html" 1876 else if (request_path.len > 1 and request_path[0] == '/') 1877 request_path[1..] 1878 else 1879 return null; 1880 1881 for (embeds) |embed| { 1882 if (std.mem.eql(u8, path, embed.path)) return embed; 1883 } 1884 return null; 1885 } 1886 1887 // emits the TUI grid cells as static HTML. each web-native Scroll becomes its 1888 // own absolutely-positioned, natively-scrollable <div> holding its full content, 1889 // rendered recursively so nested scrolls work. 1890 pub fn generateHtml(allocator: std.mem.Allocator, root: *ui.Widget, session: *ui.Session) ![]const u8 { 1891 const grid = root.getGrid() orelse return error.MissingGrid; 1892 const root_focus = root.getFocus(); 1893 1894 var out: std.ArrayList(u8) = .empty; 1895 errdefer out.deinit(allocator); 1896 1897 switch (root.*) { 1898 .background => |*background| { 1899 if (background.art.getGrid()) |art| { 1900 var position_buf: [64]u8 = undefined; 1901 try out.appendSlice(allocator, try std.fmt.bufPrint(&position_buf, "<div class=\"ansi-art\" aria-hidden=\"true\" style=\"left:{d}ch\">", .{grid.size.width -| art.size.width})); 1902 try renderPanel(allocator, &out, background.art.getFocus(), art, session, root_focus); 1903 try out.appendSlice(allocator, "</div>"); 1904 } 1905 }, 1906 else => {}, 1907 } 1908 try out.appendSlice(allocator, "<div class=\"grid-content\" data-key=\"panel:root\">"); 1909 try renderPanel(allocator, &out, root_focus, grid, session, root_focus); 1910 try out.appendSlice(allocator, "</div>"); 1911 try renderForms(allocator, &out, root_focus); 1912 return try out.toOwnedSlice(allocator); 1913 } 1914 1915 // render one panel — a focus subtree and its content grid — as HTML, recursing 1916 // once per web-native Scroll inside it. the root panel is the whole page; each 1917 // Scroll becomes a nested, natively-scrollable div holding its full content. 1918 // emits the panel's grid cells as text, leaving holes where child scrolls sit, 1919 // then the child scroll divs over those holes. 1920 fn renderPanel(allocator: std.mem.Allocator, output: *std.ArrayList(u8), focus: *Focus, grid: Grid, session: *ui.Session, root_focus: *Focus) !void { 1921 // `direct` is this panel's scroll children, each drawn as an overlaid div. 1922 // `excluded` is every focus id that belongs to a scroll (the scroll nodes 1923 // plus their descendants, which the focus tree flattens into this panel's 1924 // children): the cell hit-test below skips them so this panel doesn't claim 1925 // cells that are really rendered inside a child scroll's own panel. 1926 // (scrolls aren't nested in practice, so every scroll child is direct here.) 1927 var direct: std.ArrayList(usize) = .empty; 1928 defer direct.deinit(allocator); 1929 var excluded: std.AutoHashMapUnmanaged(usize, void) = .empty; 1930 defer excluded.deinit(allocator); 1931 { 1932 var it = focus.children.iterator(); 1933 while (it.next()) |e| { 1934 if (e.value_ptr.focus.scroll == null) continue; 1935 try direct.append(allocator, e.key_ptr.*); 1936 try excluded.put(allocator, e.key_ptr.*, {}); 1937 var mit = e.value_ptr.focus.children.iterator(); 1938 while (mit.next()) |m| try excluded.put(allocator, m.key_ptr.*, {}); 1939 } 1940 } 1941 1942 // the HTML element a run of cells is wrapped in, chosen from the cell's 1943 // focusable kind 1944 const CellTag = union(enum) { 1945 span, // clickable focusable cell 1946 a: []const u8, // clickable focusable link 1947 plain, // non-focusable, colored 1948 1949 const a_prefix = "a:"; 1950 // an "in-page" anchor: rendered as a real <a href> so it works with js 1951 // disabled, but wasm handles it without navigating. 1952 fn init(str: []const u8) @This() { 1953 if (std.mem.startsWith(u8, str, ui.raw_link_prefix)) { 1954 return .{ .a = str[ui.raw_link_prefix.len..] }; 1955 } 1956 if (std.mem.startsWith(u8, str, ui.in_page_link_prefix)) { 1957 return .{ .a = str[ui.in_page_link_prefix.len..] }; 1958 } 1959 if (std.mem.startsWith(u8, str, a_prefix)) { 1960 return .{ .a = str[a_prefix.len..] }; 1961 } 1962 return .span; 1963 } 1964 1965 fn writeOpenTag(self: @This(), alloc: std.mem.Allocator, out: *std.ArrayList(u8), id: usize, style_attr: []const u8) !void { 1966 var id_buf: [32]u8 = undefined; 1967 switch (self) { 1968 .span => { 1969 try out.appendSlice(alloc, "<span class=\"clickable\" data-focus-id=\""); 1970 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 1971 try out.appendSlice(alloc, "\""); 1972 try out.appendSlice(alloc, style_attr); 1973 try out.appendSlice(alloc, ">"); 1974 }, 1975 .a => |href| { 1976 // tabindex=-1 keeps these out of the browser's tab order 1977 try out.appendSlice(alloc, "<a class=\"clickable\" tabindex=\"-1\" data-focus-id=\""); 1978 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 1979 try out.appendSlice(alloc, "\" href=\""); 1980 try appendEscapedHtml(alloc, out, href); 1981 try out.appendSlice(alloc, "\""); 1982 try out.appendSlice(alloc, style_attr); 1983 try out.appendSlice(alloc, ">"); 1984 }, 1985 .plain => { 1986 try out.appendSlice(alloc, "<span"); 1987 try out.appendSlice(alloc, style_attr); 1988 try out.appendSlice(alloc, ">"); 1989 }, 1990 } 1991 } 1992 1993 fn closeTag(self: @This()) []const u8 { 1994 return switch (self) { 1995 .span, .plain => "</span>", 1996 .a => "</a>", 1997 }; 1998 } 1999 }; 2000 2001 // the focusable owning each cell, among this panel's own (skipping any 2002 // that belong to a child scroll, whose cells are drawn in their own panel). 2003 // claimed in focus order, so the first focusable over a cell keeps it. 2004 // looking every focusable up for every cell is quadratic in a long list. 2005 const owners = try allocator.alloc(?usize, grid.size.width * grid.size.height); 2006 defer allocator.free(owners); 2007 @memset(owners, null); 2008 { 2009 var it = focus.children.iterator(); 2010 while (it.next()) |entry| { 2011 const child = entry.value_ptr.*; 2012 if (child.focus.mode != .all) continue; 2013 if (excluded.contains(entry.key_ptr.*)) continue; 2014 const r = child.rect; 2015 for (@min(r.y, grid.size.height)..@min(r.y + r.size.height, grid.size.height)) |y| { 2016 for (@min(r.x, grid.size.width)..@min(r.x + r.size.width, grid.size.width)) |x| { 2017 const owner = &owners[y * grid.size.width + x]; 2018 if (owner.* == null) owner.* = entry.key_ptr.*; 2019 } 2020 } 2021 } 2022 } 2023 2024 // the cells are the volatile part of a panel. js replaces this one subtree 2025 // wholesale while retaining the panel's native controls and scroll shells. 2026 try output.appendSlice(allocator, "<div class=\"grid-cells\">"); 2027 2028 // emit this panel's grid as rows of text, coalescing adjacent cells that 2029 // share a focus id and style into one tag (a clickable span, a link, or a 2030 // plain styled span). cells under a child scroll keep only their background. 2031 // a cell's own link is an anchor nested in that tag. 2032 for (0..grid.size.height) |y| { 2033 var cur_id: ?usize = null; 2034 var cur_style: Grid.Style = .{}; 2035 var open_tag: ?CellTag = null; 2036 var open_link: ?[]const u8 = null; 2037 var first = true; 2038 for (0..grid.size.width) |x| { 2039 const cell = (try grid.cell(x, y)).*; 2040 // a cell covered by a child scroll's viewport is drawn by that scroll's 2041 // own div, so blank its glyph and make it non-clickable here — but keep 2042 // its background, so the backdrop still shows through the scroll's 2043 // transparent div instead of a bare hole. 2044 const covered_by_scroll = blk: { 2045 for (direct.items) |id| { 2046 const r = (focus.children.get(id) orelse continue).rect; 2047 if (x >= r.x and y >= r.y and x < r.x + r.size.width and y < r.y + r.size.height) break :blk true; 2048 } 2049 break :blk false; 2050 }; 2051 // the focusable owning the cell at (x, y); none for a covered cell. 2052 const cell_id = if (covered_by_scroll) null else owners[y * grid.size.width + x]; 2053 const style: Grid.Style = if (covered_by_scroll) .{ .bg = cell.style.bg } else cell.style; 2054 2055 if (first or cell_id != cur_id or !style.eql(cur_style)) { 2056 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2057 open_link = null; 2058 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2059 2060 var new_tag: ?CellTag = null; 2061 if (cell_id) |id| { 2062 if (focus.children.get(id)) |child| { 2063 new_tag = switch (child.focus.kind) { 2064 .custom => |custom| CellTag.init(custom), 2065 else => .span, 2066 }; 2067 } 2068 } 2069 if (new_tag == null and !style.eql(.{})) new_tag = .plain; 2070 2071 if (new_tag) |t| { 2072 var style_buf: [192]u8 = undefined; 2073 try t.writeOpenTag(allocator, output, cell_id orelse 0, styleAttr(&style_buf, style)); 2074 } 2075 2076 open_tag = new_tag; 2077 cur_id = cell_id; 2078 cur_style = style; 2079 first = false; 2080 } 2081 2082 // an anchor can't nest in another, so a link tag's cells skip theirs 2083 const in_anchor = if (open_tag) |t| t == .a else false; 2084 const link = if (covered_by_scroll or in_anchor) null else webLink(cell.link); 2085 if (!sameLink(link, open_link)) { 2086 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2087 if (link) |url| { 2088 try output.appendSlice(allocator, "<a class=\"cell-link\" tabindex=\"-1\" target=\"_blank\" rel=\"noopener noreferrer\" href=\""); 2089 try appendEscapedHtml(allocator, output, url); 2090 try output.appendSlice(allocator, "\">"); 2091 } 2092 open_link = link; 2093 } 2094 2095 if (covered_by_scroll) { 2096 try appendEscapedHtml(allocator, output, " "); 2097 } else if (cell.continuation) { 2098 // the wide rune to the left was emitted 2ch wide, covering this column 2099 } else if (cell.rune) |rune| { 2100 var encoded: [4]u8 = undefined; 2101 const encoded_len = try std.unicode.utf8Encode(rune, &encoded); 2102 const rune_text = encoded[0..encoded_len]; 2103 // a double-width rune is pinned inside a 2ch span so the 2104 // fallback glyph's advance width can't shift the rest of the row 2105 const wide = x + 1 < grid.size.width and (try grid.cell(x + 1, y)).continuation; 2106 if (wide) { 2107 try output.appendSlice(allocator, "<span class=\"w2\">"); 2108 try appendEscapedHtml(allocator, output, rune_text); 2109 try output.appendSlice(allocator, "</span>"); 2110 } else { 2111 try appendEscapedHtml(allocator, output, rune_text); 2112 } 2113 } else { 2114 try appendEscapedHtml(allocator, output, " "); 2115 } 2116 } 2117 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2118 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2119 try output.append(allocator, '\n'); 2120 } 2121 try output.appendSlice(allocator, "</div>"); 2122 2123 // native controls live in their panel, beside the replaceable cells. their 2124 // stable keys let JS update layout without recreating their DOM nodes, and 2125 // being actual descendants of a scroll gives them native movement/clipping. 2126 try renderPanelControls(allocator, output, focus, session, root_focus, &excluded); 2127 2128 // each child scroll becomes a natively-scrollable div positioned over its 2129 // viewport, holding its full content rendered recursively. 2130 for (direct.items) |id| { 2131 const child = focus.children.get(id) orelse continue; 2132 const info = child.focus.scroll orelse continue; 2133 const r = child.rect; 2134 // overflow only on the axes the widget scrolls; `auto` shows a bar only 2135 // when that axis actually overflows. the other axis is clipped (hidden), 2136 // matching how the terminal Scroll handles its non-scrolling axis. 2137 const overflow = switch (info.direction) { 2138 .vert => "overflow-x:hidden;overflow-y:auto", 2139 .horiz => "overflow-x:auto;overflow-y:hidden", 2140 .both => "overflow:auto", 2141 }; 2142 // the id carries a content version so JS preserves the native scroll 2143 // position across re-renders of the same content but resets it when the 2144 // content is replaced — e.g. selecting a different commit. the widget's 2145 // scroll offset (in cells) rides along so JS can apply it when it has no 2146 // preserved position, letting a wasm-side scrollToRect (the files list 2147 // scrolling to its selected row on page load) reach the browser. 2148 var buf: [256]u8 = undefined; 2149 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, "<div class=\"scroll\" data-key=\"scroll:{d}\" data-scroll-id=\"{d}-{d}\" data-scroll-direction=\"{s}\" data-scroll-x=\"{d}\" data-scroll-y=\"{d}\" style=\"left:{d}ch;top:{d}em;width:{d}ch;height:{d}em;{s}\">", .{ id, id, child.focus.version, @tagName(info.direction), info.offset_x, info.offset_y, r.x, r.y, r.size.width, r.size.height, overflow })); 2150 try renderPanel(allocator, output, child.focus, info.content, session, root_focus); 2151 try output.appendSlice(allocator, "</div>"); 2152 } 2153 } 2154 2155 const form_prefix = "form:"; 2156 const form_id_prefix = "haxy-form-"; 2157 2158 fn formAction(focus: *const Focus) ?[]const u8 { 2159 return switch (focus.kind) { 2160 .custom => |custom| if (std.mem.startsWith(u8, custom, form_prefix)) custom[form_prefix.len..] else null, 2161 else => null, 2162 }; 2163 } 2164 2165 // find the form ancestor of a flattened focus-tree child. html's `form` 2166 // attribute then associates the control with that form without requiring the 2167 // form and control to share a DOM parent. 2168 fn formOwner(root_focus: *Focus, focus_id: usize) ?usize { 2169 var id = focus_id; 2170 while (root_focus.children.get(id)) |child| { 2171 const parent_id = child.parent_id; 2172 if (parent_id == root_focus.id) return if (formAction(root_focus) != null) root_focus.id else null; 2173 const parent = root_focus.children.get(parent_id) orelse return null; 2174 if (formAction(parent.focus) != null) return parent_id; 2175 id = parent_id; 2176 } 2177 return null; 2178 } 2179 2180 fn appendFormAttribute(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus, focus_id: usize) !void { 2181 const form_id = formOwner(root_focus, focus_id) orelse return; 2182 var buf: [64]u8 = undefined; 2183 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, " form=\"" ++ form_id_prefix ++ "{d}\"", .{form_id})); 2184 } 2185 2186 fn renderPanelControls( 2187 allocator: std.mem.Allocator, 2188 output: *std.ArrayList(u8), 2189 focus: *Focus, 2190 session: *ui.Session, 2191 root_focus: *Focus, 2192 excluded: *const std.AutoHashMapUnmanaged(usize, void), 2193 ) !void { 2194 var iter = focus.children.iterator(); 2195 while (iter.next()) |entry| { 2196 const id = entry.key_ptr.*; 2197 if (excluded.contains(id)) continue; 2198 const child = entry.value_ptr.*; 2199 const r = child.rect; 2200 2201 if (r.size.width == 0 or r.size.height == 0) continue; // not laid out, rather than merely off-screen 2202 2203 switch (child.focus.kind) { 2204 .text_input, .text_input_password, .text_area => { 2205 const ti = session.text_inputs.get(id) orelse continue; 2206 2207 const inner_left = r.x + 1; 2208 const inner_top = r.y + 1; 2209 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 2210 const preserve = !ti.options.read_only; 2211 2212 if (child.focus.kind == .text_area) { 2213 const value = try ti.text(allocator); 2214 defer allocator.free(value); 2215 var id_buf: [128]u8 = undefined; 2216 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<textarea data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2217 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2218 try appendFormAttribute(allocator, output, root_focus, id); 2219 if (ti.options.name.len > 0) { 2220 try output.appendSlice(allocator, " name=\""); 2221 try appendEscapedHtml(allocator, output, ti.options.name); 2222 try output.append(allocator, '"'); 2223 } 2224 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 2225 var pos_buf: [128]u8 = undefined; 2226 try output.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, " style=\"left:{d}ch;top:{d}em;width:{d}ch;height:{d}em\">\n", .{ inner_left, inner_top, inner_width, inner_height })); 2227 try appendEscapedHtml(allocator, output, value); 2228 try output.appendSlice(allocator, "</textarea>"); 2229 continue; 2230 } 2231 2232 var id_buf: [160]u8 = undefined; 2233 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"{s}\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ if (child.focus.kind == .text_input_password) "password" else "text", id, id })); 2234 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2235 try appendFormAttribute(allocator, output, root_focus, id); 2236 if (ti.options.name.len > 0) { 2237 try output.appendSlice(allocator, " name=\""); 2238 try appendEscapedHtml(allocator, output, ti.options.name); 2239 try output.append(allocator, '"'); 2240 } 2241 if (child.focus.kind != .text_input_password) { 2242 const value = try ti.text(allocator); 2243 defer allocator.free(value); 2244 try output.appendSlice(allocator, " value=\""); 2245 try appendEscapedHtml(allocator, output, value); 2246 try output.append(allocator, '"'); 2247 } 2248 var pos_buf: [96]u8 = undefined; 2249 try output.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, " style=\"left:{d}ch;top:{d}em;width:{d}ch;height:1em\">", .{ inner_left, inner_top, inner_width })); 2250 }, 2251 .custom => |custom| { 2252 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2253 if (formOwner(root_focus, id) == null) continue; 2254 var id_buf: [128]u8 = undefined; 2255 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2256 try appendFormAttribute(allocator, output, root_focus, id); 2257 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2258 try output.appendSlice(allocator, " formaction=\""); 2259 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2260 try output.append(allocator, '"'); 2261 } 2262 var pos_buf: [128]u8 = undefined; 2263 try output.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, " style=\"left:{d}ch;top:{d}em;width:{d}ch;height:{d}em\"></button>", .{ r.x, r.y, r.size.width, r.size.height })); 2264 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2265 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2266 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2267 var id_buf: [128]u8 = undefined; 2268 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "\" data-key=\"control:{d}\" data-focus-id=\"{d}\" style=\"opacity:0;left:{d}ch;top:{d}em;width:{d}ch;height:{d}em\">", .{ id, id, r.x, r.y, r.size.width, r.size.height })); 2269 } 2270 }, 2271 else => {}, 2272 } 2273 } 2274 } 2275 2276 // emit hidden form owners beside the rendered panels. their controls point 2277 // back here with the standard HTML `form` attribute. 2278 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2279 // the focus child map preserves insertion order, which matches the order 2280 // widgets were added in code 2281 var iter = root_focus.children.iterator(); 2282 while (iter.next()) |entry| { 2283 const child = entry.value_ptr.*; 2284 const action_url = formAction(child.focus) orelse continue; 2285 2286 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2287 var id_buf: [96]u8 = undefined; 2288 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2289 try appendEscapedHtml(allocator, output, action_url); 2290 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2291 } 2292 } 2293 2294 // the 16 ansi colors as the browser shows them (xterm's defaults) 2295 const ansi_palette = [16]Grid.Color.Rgb{ 2296 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2297 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2298 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2299 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2300 }; 2301 2302 // resolve any color to rgb: palette colors through the ansi table and the 2303 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2304 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2305 return switch (color) { 2306 .rgb => |c| c, 2307 .ansi => |a| ansi_palette[@intFromEnum(a)], 2308 .indexed => |n| if (n < 16) 2309 ansi_palette[n] 2310 else if (n < 232) blk: { 2311 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2312 const i = n - 16; 2313 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2314 } else blk: { 2315 const v: u8 = 8 + (n - 232) * 10; 2316 break :blk .{ .r = v, .g = v, .b = v }; 2317 }, 2318 }; 2319 } 2320 2321 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2322 // cell's style into `buf`, omitting whichever color is unset. an inverted 2323 // cell swaps the two, falling back to the page's --fg/--bg variables for 2324 // whichever side is unset. text attributes follow the colors. returns an 2325 // empty slice when nothing is set. 2326 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2327 if (style.eql(.{})) return buf[0..0]; 2328 const prefix = " style=\""; 2329 @memcpy(buf[0..prefix.len], prefix); 2330 var i: usize = prefix.len; 2331 const inverted = style.inverted; 2332 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2333 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2334 const decoration: []const u8 = if (style.underline and style.strikethrough) 2335 "text-decoration:underline line-through;" 2336 else if (style.underline) 2337 "text-decoration:underline;" 2338 else if (style.strikethrough) 2339 "text-decoration:line-through;" 2340 else 2341 ""; 2342 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2343 if (style.bold) "font-weight:bold;" else "", 2344 if (style.italic) "font-style:italic;" else "", 2345 decoration, 2346 if (style.dim) "opacity:.6;" else "", 2347 }) catch return buf[0..0]; 2348 i += attributes.len; 2349 if (i >= buf.len) return buf[0..0]; 2350 buf[i] = '"'; 2351 return buf[0 .. i + 1]; 2352 } 2353 2354 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2355 // the color is unset (nothing when both are). returns the new end, or null 2356 // when it doesn't fit. 2357 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2358 const s = if (color) |c| blk: { 2359 const v = colorRgb(c); 2360 break :blk std.fmt.bufPrint(buf[i..], "{s}:#{x:0>2}{x:0>2}{x:0>2};", .{ prop, v.r, v.g, v.b }) catch return null; 2361 } else if (fallback) |f| 2362 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2363 else 2364 return i; 2365 return i + s.len; 2366 } 2367 2368 // a cell's link as an href, when it's a web or mail url 2369 fn webLink(link: ?[]const u8) ?[]const u8 { 2370 const url = link orelse return null; 2371 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2372 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2373 } 2374 return null; 2375 } 2376 2377 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2378 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2379 return b == null; 2380 } 2381 2382 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2383 for (input) |ch| { 2384 switch (ch) { 2385 '&' => try out.appendSlice(allocator, "&amp;"), 2386 '<' => try out.appendSlice(allocator, "&lt;"), 2387 '>' => try out.appendSlice(allocator, "&gt;"), 2388 '"' => try out.appendSlice(allocator, "&quot;"), 2389 '\'' => try out.appendSlice(allocator, "&#39;"), 2390 else => try out.append(allocator, ch), 2391 } 2392 } 2393 } 2394 2395 // --- helpers -------------------------------------------------------------- 2396 2397 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2398 var iter = request.iterateHeaders(); 2399 while (iter.next()) |header| { 2400 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2401 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2402 while (pairs.next()) |pair| { 2403 const trimmed = std.mem.trim(u8, pair, " \t"); 2404 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2405 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2406 return trimmed[eq + 1 ..]; 2407 } 2408 } 2409 } 2410 return null; 2411 } 2412 2413 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2414 var iter = std.mem.splitScalar(u8, body, '&'); 2415 while (iter.next()) |pair| { 2416 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2417 if (std.mem.eql(u8, pair[0..eq], key)) { 2418 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2419 } 2420 } 2421 return null; 2422 } 2423 2424 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2425 var buffer: [256]u8 = undefined; 2426 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2427 } 2428 2429 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2430 var out: std.ArrayList(u8) = .empty; 2431 errdefer out.deinit(allocator); 2432 var i: usize = 0; 2433 while (i < encoded.len) : (i += 1) { 2434 switch (encoded[i]) { 2435 '+' => try out.append(allocator, ' '), 2436 '%' => { 2437 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2438 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2439 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2440 try out.append(allocator, hi * 16 + lo); 2441 i += 2; 2442 }, 2443 else => try out.append(allocator, encoded[i]), 2444 } 2445 } 2446 return try out.toOwnedSlice(allocator); 2447 } 2448 2449 // disk-backed web session store. each login mints a random, opaque token 2450 // (not the user's id) that is stored as a file named by the token hex, whose 2451 // contents are the raw user_id bytes. authenticating a request is a lookup of 2452 // the cookie's token; logout deletes the file, revoking the session. there is 2453 // deliberately no expiry — a session lives until logout. form failures use 2454 // files in the flash subdirectory that the redirected GET consumes. the 2455 // directory is cleared whenever the server starts. 2456 pub const SessionStore = struct { 2457 io: std.Io, 2458 dir: std.Io.Dir, 2459 flash_dir: std.Io.Dir, 2460 auto_login: ?[token_hex_len]u8, 2461 2462 pub const token_hex_len = evt.event_id_size * 2; 2463 2464 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2465 try data_dir.createDirPath(io, "sessions"); 2466 const dir = try data_dir.openDir(io, "sessions", .{}); 2467 errdefer dir.close(io); 2468 try dir.deleteTree(io, "flash"); 2469 try dir.createDirPath(io, "flash"); 2470 const flash_dir = try dir.openDir(io, "flash", .{}); 2471 errdefer flash_dir.close(io); 2472 const auto_login = blk: { 2473 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2474 defer file.close(io); 2475 var token: [token_hex_len]u8 = undefined; 2476 var storage: [token_hex_len]u8 = undefined; 2477 var reader = file.reader(io, &storage); 2478 reader.interface.readSliceAll(&token) catch break :blk null; 2479 break :blk token; 2480 }; 2481 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2482 } 2483 2484 pub fn deinit(self: SessionStore) void { 2485 self.flash_dir.close(self.io); 2486 self.dir.close(self.io); 2487 } 2488 2489 // mint a new session for user_id, returning the token hex to set as the 2490 // cookie value. 2491 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 2492 var token: [evt.event_id_size]u8 = undefined; 2493 self.io.random(&token); 2494 const token_hex = std.fmt.bytesToHex(token, .lower); 2495 const file = try self.dir.createFile(self.io, &token_hex, .{}); 2496 defer file.close(self.io); 2497 try file.writeStreamingAll(self.io, user_id); 2498 return token_hex; 2499 } 2500 2501 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 2502 var token: [evt.event_id_size]u8 = undefined; 2503 self.io.random(&token); 2504 const token_hex = std.fmt.bytesToHex(token, .lower); 2505 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 2506 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 2507 defer file.close(self.io); 2508 2509 var json: std.Io.Writer.Allocating = .init(allocator); 2510 defer json.deinit(); 2511 try std.json.Stringify.value(value, .{}, &json.writer); 2512 try file.writeStreamingAll(self.io, json.written()); 2513 return token_hex; 2514 } 2515 2516 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 2517 if (!isToken(token_hex)) return null; 2518 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 2519 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 2520 defer file.close(self.io); 2521 2522 var storage: [4096]u8 = undefined; 2523 var reader = file.reader(self.io, &storage); 2524 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 2525 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 2526 } 2527 2528 // resolve a cookie's token to its user_id. returns false (logged out) for a 2529 // missing, malformed, or unknown token. 2530 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 2531 if (!isToken(token_hex)) return false; 2532 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 2533 defer file.close(self.io); 2534 var storage: [evt.event_id_size]u8 = undefined; 2535 var file_reader = file.reader(self.io, &storage); 2536 file_reader.interface.readSliceAll(out) catch return false; 2537 return true; 2538 } 2539 2540 // revoke a session. a no-op for a missing or malformed token. 2541 pub fn remove(self: SessionStore, token_hex: []const u8) void { 2542 if (!isToken(token_hex)) return; 2543 self.dir.deleteFile(self.io, token_hex) catch {}; 2544 } 2545 2546 // leave `token_hex`'s session for visitors arriving without one. only the 2547 // `try` fixture writes one. the name can't collide with a session token. 2548 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 2549 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 2550 defer file.close(self.io); 2551 try file.writeStreamingAll(self.io, token_hex); 2552 } 2553 2554 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 2555 out.* = self.auto_login orelse return false; 2556 return true; 2557 } 2558 2559 const auto_login_name = "auto-login"; 2560 2561 // a token is exactly token_hex_len hex chars. validating before using the 2562 // value as a path keeps attacker-supplied cookies from escaping the 2563 // sessions dir (e.g. via "/" or ".." bytes). 2564 fn isToken(token_hex: []const u8) bool { 2565 if (token_hex.len != token_hex_len) return false; 2566 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 2567 return true; 2568 } 2569 }; 2570