╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭b656302e..╮ b656302e.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (289) user
╭────╮ ╭ clone ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╮ │http│ ssh │ │ ╰────╯ ╰ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╯
.. embed/ event/ test/ ui/ command.zig event.zig lib.zig main.zig main_wasm.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 │ ╰─────────────────────────────────╯
479 if (std.mem.startsWith(u8, str, inpage_prefix)) { 480 return .{ .a = str[inpage_prefix.len..] }; 481 } 482 if (std.mem.startsWith(u8, str, a_prefix)) { 483 return .{ .a = str[a_prefix.len..] }; 484 } 485 return .span; 486 } 487 488 fn writeOpenTag(self: @This(), alloc: std.mem.Allocator, out: *std.ArrayList(u8), id: usize, style_attr: []const u8) !void { 489 var id_buf: [32]u8 = undefined; 490 switch (self) { 491 .span => { 492 try out.appendSlice(alloc, "<span class=\"clickable\" data-focus-id=\""); 493 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 494 try out.appendSlice(alloc, "\""); 495 try out.appendSlice(alloc, style_attr); 496 try out.appendSlice(alloc, ">"); 497 }, 498 .a => |href| { 499 // tabindex=-1 keeps these out of the browser's tab order 500 try out.appendSlice(alloc, "<a class=\"clickable\" tabindex=\"-1\" data-focus-id=\""); 501 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 502 try out.appendSlice(alloc, "\" href=\""); 503 try appendEscapedHtml(alloc, out, href); 504 try out.appendSlice(alloc, "\""); 505 try out.appendSlice(alloc, style_attr); 506 try out.appendSlice(alloc, ">"); 507 }, 508 .plain => { 509 try out.appendSlice(alloc, "<span"); 510 try out.appendSlice(alloc, style_attr); 511 try out.appendSlice(alloc, ">"); 512 }, 513 } 514 } 515 516 fn closeTag(self: @This()) []const u8 { 517 return switch (self) { 518 .span, .plain => "</span>", 519 .a => "</a>", 520 }; 521 } 522 }; 523 524 // emit this panel's grid as rows of text, coalescing adjacent cells that 525 // share a focus id and colors into one tag (a clickable span, a link, or a 526 // plain colored span). cells under a child scroll keep only their background. 527 for (0..grid.size.height) |y| { 528 var cur_id: ?usize = null; 529 var cur_fg: ?Grid.Color = null; 530 var cur_bg: ?Grid.Color = null; 531 var open_tag: ?CellTag = null; 532 var first = true; 533 for (0..grid.size.width) |x| { 534 const cell = grid.cells.items[try grid.cells.at(.{ y, x })]; 535 // a cell covered by a child scroll's viewport is drawn by that scroll's 536 // own div, so blank its glyph and make it non-clickable here — but keep 537 // its background, so the backdrop still shows through the scroll's 538 // transparent div instead of a bare hole. 539 const covered_by_scroll = blk: { 540 for (direct.items) |id| { 541 const r = (focus.children.get(id) orelse continue).rect; 542 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; 543 } 544 break :blk false; 545 }; 546 // the focusable cell at (x, y) among this panel's own focusables (skipping 547 // any that belong to a child scroll, whose cells are drawn in their own 548 // panel); none for a covered cell. 549 const cell_id = if (covered_by_scroll) null else blk: { 550 var iter = focus.children.iterator(); 551 while (iter.next()) |entry| { 552 const child = entry.value_ptr.*; 553 if (!child.focus.focusable) continue; 554 if (excluded.contains(entry.key_ptr.*)) continue; 555 const r = child.rect; 556 if (x >= r.x and y >= r.y and x < r.x + r.size.width and y < r.y + r.size.height) { 557 break :blk entry.key_ptr.*; 558 } 559 } 560 break :blk null; 561 }; 562 const fg = if (covered_by_scroll) null else cell.style.fg; 563 const bg = cell.style.bg; 564 565 if (first or cell_id != cur_id or !colorEql(fg, cur_fg) or !colorEql(bg, cur_bg)) { 566 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 567 568 var new_tag: ?CellTag = null; 569 if (cell_id) |id| { 570 if (focus.children.get(id)) |child| { 571 new_tag = switch (child.focus.kind) { 572 .custom => |custom| CellTag.init(custom), 573 else => .span, 574 }; 575 } 576 } 577 if (new_tag == null and (fg != null or bg != null)) new_tag = .plain; 578 579 if (new_tag) |t| { 580 var style_buf: [64]u8 = undefined; 581 try t.writeOpenTag(allocator, output, cell_id orelse 0, styleAttr(&style_buf, fg, bg)); 582 } 583 584 open_tag = new_tag; 585 cur_id = cell_id; 586 cur_fg = fg; 587 cur_bg = bg; 588 first = false; 589 } 590 591 try appendEscapedHtml(allocator, output, if (covered_by_scroll) " " else (cell.rune orelse " ")); 592 } 593 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 594 try output.append(allocator, '\n'); 595 } 596 597 // each child scroll becomes a natively-scrollable div positioned over its 598 // viewport, holding its full content rendered recursively. 599 for (direct.items) |id| { 600 const child = focus.children.get(id) orelse continue; 601 const info = child.focus.scroll orelse continue; 602 const r = child.rect; 603 // overflow only on the axes the widget scrolls; `auto` shows a bar only 604 // when that axis actually overflows. the other axis is clipped (hidden), 605 // matching how the terminal Scroll handles its non-scrolling axis. 606 const overflow = switch (info.direction) { 607 .vert => "overflow-x:hidden;overflow-y:auto", 608 .horiz => "overflow-x:auto;overflow-y:hidden", 609 .both => "overflow:auto", 610 }; 611 // the id carries a content version so JS preserves the native scroll 612 // position across re-renders of the same content but resets it when the 613 // content is replaced — e.g. selecting a different commit. the widget's 614 // scroll offset (in cells) rides along so JS can apply it when it has no 615 // preserved position, letting a wasm-side scrollToRect (the files list 616 // scrolling to its selected row on page load) reach the browser. 617 var buf: [224]u8 = undefined; 618 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, "<div class=\"scroll\" data-scroll-id=\"{d}-{d}\" data-scroll-x=\"{d}\" data-scroll-y=\"{d}\" style=\"left:{d}ch;top:{d}em;width:{d}ch;height:{d}em;{s}\">", .{ id, child.focus.version, info.offset_x, info.offset_y, r.x, r.y, r.size.width, r.size.height, overflow })); 619 try renderPanel(allocator, output, child.focus, info.content); 620 try output.appendSlice(allocator, "</div>"); 621 } 622 } 623 624 // emits the form overlay — one <form> per "form:<url>" focus subtree in the 625 // widget tree, each wrapping the text inputs and submit button inside it, 626 // positioned absolutely over the matching grid cells. 627 pub fn generateOverlay(allocator: std.mem.Allocator, root: *ui.Widget, session: *ui.Session) ![]const u8 { 628 const root_focus = root.getFocus(); 629 630 var out: std.ArrayList(u8) = .empty; 631 errdefer out.deinit(allocator); 632 633 const form_prefix = "form:"; 634 635 // Focus.children is an AutoArrayHashMap that preserves insertion order, 636 // which matches the order widgets were added in code 637 var iter = root_focus.children.iterator(); 638 while (iter.next()) |entry| { 639 const child = entry.value_ptr.*; 640 const action_url = switch (child.focus.kind) { 641 .custom => |custom| if (std.mem.startsWith(u8, custom, form_prefix)) 642 custom[form_prefix.len..] 643 else 644 continue, 645 else => continue, 646 }; 647 648 try out.appendSlice(allocator, "<form action=\""); 649 try appendEscapedHtml(allocator, &out, action_url); 650 try out.appendSlice(allocator, "\" method=\"post\""); 651 // an empty action must not POST — block it and send the input to the TUI instead 652 if (action_url.len == 0) try out.appendSlice(allocator, " onsubmit=\"event.preventDefault();sendEnter(this);\""); 653 try out.appendSlice(allocator, ">"); 654 655 // form.focus.children was populated by addChild, which flattens the 656 // whole subtree into one map — so descendants (inputs + the submit 657 // button) all appear here. positions on form.focus are relative to 658 // the form, so we look up absolute rects via root_focus for layout. 659 var inner_iter = child.focus.children.iterator(); 660 while (inner_iter.next()) |inner_entry| { 661 const inner_id = inner_entry.key_ptr.*; 662 const root_child = root_focus.children.get(inner_id) orelse continue; 663 const r = root_child.rect; 664 switch (root_child.focus.kind) { 665 .text_input, .text_input_password => { 666 const ti = session.text_inputs.get(inner_id) orelse continue; 667 const inner_left = r.x + 1; 668 const inner_top = r.y + 1; 669 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 670 671 try out.appendSlice(allocator, "<input type=\""); 672 try out.appendSlice(allocator, if (root_child.focus.kind == .text_input_password) "password" else "text"); 673 try out.appendSlice(allocator, "\" data-focus-id=\""); 674 var id_buf: [32]u8 = undefined; 675 try out.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}", .{inner_id})); 676 if (ti.options.name.len > 0) { 677 try out.appendSlice(allocator, "\" name=\""); 678 try appendEscapedHtml(allocator, &out, ti.options.name); 679 } 680 // intentionally no `value` attribute: the browser tracks user input 681 // natively, and including the wasm-side value here would make the 682 // overlay HTML differ on every keystroke — that would trip the diff 683 // in _setOverlay and rebuild the <input>, eating the user's caret. 684 try out.appendSlice(allocator, "\" style=\"left:"); 685 var pos_buf: [64]u8 = undefined; 686 try out.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, "{d}ch;top:{d}em;width:{d}ch;height:1em", .{ inner_left, inner_top, inner_width })); 687 try out.appendSlice(allocator, "\">"); 688 }, 689 .custom => |custom| { 690 if (std.mem.eql(u8, "submit", custom)) { 691 // inside the dashed border the TUI cells draw around the button. 692 const inner_left = r.x + 1; 693 const inner_top = r.y + 1; 694 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 695 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 696 try out.appendSlice(allocator, "<button type=\"submit\" data-focus-id=\""); 697 var id_buf: [32]u8 = undefined; 698 try out.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}", .{inner_id})); 699 try out.appendSlice(allocator, "\" style=\"left:"); 700 var pos_buf: [128]u8 = undefined; 701 try out.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, "{d}ch;top:{d}em;width:{d}ch;height:{d}em", .{ inner_left, inner_top, inner_width, inner_height })); 702 try out.appendSlice(allocator, "\"></button>"); 703 } 704 }, 705 else => {}, 706 } 707 } 708 709 try out.appendSlice(allocator, "</form>"); 710 } 711 712 return try out.toOwnedSlice(allocator); 713 } 714 715 fn colorEql(a: ?Grid.Color, b: ?Grid.Color) bool { 716 if (a) |av| return if (b) |bv| av.eql(bv) else false; 717 return b == null; 718 } 719 720 // builds an HTML ` style="color:#rrggbb;background-color:#rrggbb"` attribute 721 // from a cell's fg/bg into `buf`, omitting whichever color is unset. returns an 722 // empty slice when neither is set. 723 fn styleAttr(buf: []u8, fg: ?Grid.Color, bg: ?Grid.Color) []const u8 { 724 if (fg == null and bg == null) return buf[0..0]; 725 const prefix = " style=\""; 726 @memcpy(buf[0..prefix.len], prefix); 727 var i: usize = prefix.len; 728 if (fg) |c| { 729 const s = std.fmt.bufPrint(buf[i..], "color:#{x:0>2}{x:0>2}{x:0>2};", .{ c.r, c.g, c.b }) catch return buf[0..0]; 730 i += s.len; 731 } 732 if (bg) |c| { 733 const s = std.fmt.bufPrint(buf[i..], "background-color:#{x:0>2}{x:0>2}{x:0>2};", .{ c.r, c.g, c.b }) catch return buf[0..0]; 734 i += s.len; 735 } 736 buf[i] = '"'; 737 i += 1; 738 return buf[0..i]; 739 } 740 741 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 742 for (input) |ch| { 743 switch (ch) { 744 '&' => try out.appendSlice(allocator, "&amp;"), 745 '<' => try out.appendSlice(allocator, "&lt;"), 746 '>' => try out.appendSlice(allocator, "&gt;"), 747 '"' => try out.appendSlice(allocator, "&quot;"), 748 '\'' => try out.appendSlice(allocator, "&#39;"), 749 else => try out.append(allocator, ch), 750 } 751 } 752 } 753 754 // --- helpers -------------------------------------------------------------- 755 756 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 757 var iter = request.iterateHeaders(); 758 while (iter.next()) |header| { 759 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 760 var pairs = std.mem.splitScalar(u8, header.value, ';'); 761 while (pairs.next()) |pair| { 762 const trimmed = std.mem.trim(u8, pair, " \t"); 763 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 764 if (std.mem.eql(u8, trimmed[0..eq], name)) { 765 return trimmed[eq + 1 ..]; 766 } 767 } 768 } 769 return null; 770 } 771 772 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 773 var iter = std.mem.splitScalar(u8, body, '&'); 774 while (iter.next()) |pair| { 775 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 776 if (std.mem.eql(u8, pair[0..eq], key)) { 777 return try decodeFormValue(allocator, pair[eq + 1 ..]); 778 } 779 } 780 return null; 781 } 782 783 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 784 var out: std.ArrayList(u8) = .empty; 785 errdefer out.deinit(allocator); 786 var i: usize = 0; 787 while (i < encoded.len) : (i += 1) { 788 switch (encoded[i]) { 789 '+' => try out.append(allocator, ' '), 790 '%' => { 791 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 792 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 793 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 794 try out.append(allocator, hi * 16 + lo); 795 i += 2; 796 }, 797 else => try out.append(allocator, encoded[i]), 798 } 799 } 800 return try out.toOwnedSlice(allocator); 801 } 802 803 // disk-backed web session store. each login mints a random, opaque token 804 // (not the user's id) that is stored as a file named by the token hex, whose 805 // contents are the raw user_id bytes. authenticating a request is a lookup of 806 // the cookie's token; logout deletes the file, revoking the session. there is 807 // deliberately no expiry — a session lives until logout. 808 pub const SessionStore = struct { 809 io: std.Io, 810 dir: std.Io.Dir, 811 812 pub const token_hex_len = evt.event_id_size * 2; 813 814 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 815 try data_dir.createDirPath(io, "sessions"); 816 const dir = try data_dir.openDir(io, "sessions", .{}); 817 return .{ .io = io, .dir = dir }; 818 } 819 820 pub fn deinit(self: SessionStore) void { 821 self.dir.close(self.io); 822 } 823 824 // mint a new session for user_id, returning the token hex to set as the 825 // cookie value. 826 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 827 var token: [evt.event_id_size]u8 = undefined; 828 self.io.random(&token); 829 const token_hex = std.fmt.bytesToHex(token, .lower); 830 const file = try self.dir.createFile(self.io, &token_hex, .{}); 831 defer file.close(self.io); 832 try file.writeStreamingAll(self.io, user_id); 833 return token_hex; 834 } 835 836 // resolve a cookie's token to its user_id. returns false (logged out) for a 837 // missing, malformed, or unknown token. 838 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 839 if (!isToken(token_hex)) return false; 840 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 841 defer file.close(self.io); 842 var storage: [evt.event_id_size]u8 = undefined; 843 var file_reader = file.reader(self.io, &storage); 844 file_reader.interface.readSliceAll(out) catch return false; 845 return true; 846 } 847 848 // revoke a session. a no-op for a missing or malformed token. 849 pub fn remove(self: SessionStore, token_hex: []const u8) void { 850 if (!isToken(token_hex)) return; 851 self.dir.deleteFile(self.io, token_hex) catch {}; 852 } 853 854 // a token is exactly token_hex_len hex chars. validating before using the 855 // value as a path keeps attacker-supplied cookies from escaping the 856 // sessions dir (e.g. via "/" or ".." bytes). 857 fn isToken(token_hex: []const u8) bool { 858 if (token_hex.len != token_hex_len) return false; 859 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 860 return true; 861 } 862 }; 863