╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ 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🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭73ff1bca..╮ 73ff1bca.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (614) 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 │ ╰─────────────────────────────────╯
1312 .status = .not_found, 1313 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1314 }); 1315 return; 1316 }, 1317 else => |e| return e, 1318 }; 1319 1320 try request.respond("", .{ 1321 .status = .see_other, 1322 .extra_headers = &.{.{ .name = "location", .value = base }}, 1323 }); 1324 } 1325 1326 fn updateThread( 1327 comptime Event: type, 1328 io: std.Io, 1329 allocator: std.mem.Allocator, 1330 host: Host, 1331 repo_base: []const u8, 1332 id: *const [evt.event_id_size]u8, 1333 update: Event.Update, 1334 author: evt.CommitAuthor, 1335 ) !void { 1336 const request_repo = (try requestRepoSource(io, allocator, host, repo_base)) orelse return error.NotFound; 1337 defer request_repo.deinit(allocator); 1338 const source = request_repo.source; 1339 switch (source.repo_kind) { 1340 inline else => |repo_kind| { 1341 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1342 defer any_repo.deinit(io, allocator); 1343 switch (any_repo) { 1344 inline else => |*repo| try Event.update(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, id, update, author), 1345 } 1346 }, 1347 } 1348 } 1349 1350 const RemoveParts = struct { 1351 repo_base: []const u8, 1352 kind: evt.EventKind, 1353 id: [evt.event_id_size]u8, 1354 }; 1355 1356 // split a remove url into the repo and event it names 1357 fn removeParts(base: []const u8) ?RemoveParts { 1358 if (attachmentRequest(base)) |attachment| { 1359 const parent = attachParentParts(attachment.repo_base) orelse return null; 1360 return .{ 1361 .repo_base = parent.repo_base, 1362 .kind = .attach, 1363 .id = attachment.id, 1364 }; 1365 } 1366 if (commentBaseParts(base)) |thread| return .{ 1367 .repo_base = thread.repo_base, 1368 .kind = if (thread.comment_id != null) .comment else thread.thread_kind, 1369 .id = thread.comment_id orelse thread.thread_id, 1370 }; 1371 return null; 1372 } 1373 1374 // remove the event named by the form's url 1375 fn handleRemove( 1376 io: std.Io, 1377 request: *std.http.Server.Request, 1378 allocator: std.mem.Allocator, 1379 base: []const u8, 1380 host: Host, 1381 ) !void { 1382 const parts = removeParts(base) orelse return respondRemoveNotFound(request); 1383 1384 var author_arena = std.heap.ArenaAllocator.init(allocator); 1385 defer author_arena.deinit(); 1386 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return; 1387 const author = actor.author; 1388 1389 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1390 defer request_repo.deinit(allocator); 1391 const source = request_repo.source; 1392 1393 if (parts.kind == .patch) switch (host) { 1394 .server => |server| { 1395 const user_id = actor.user_id orelse return respondLoginRequired(request); 1396 1397 // a draft lives in its author's user repo 1398 if (try evt.readForkById(io, allocator, &author_arena, server.users_dir, &user_id, &parts.id)) |fork_record| { 1399 const repo_id = evt.parseEventId(std.fs.path.basename(source.path)) catch return respondRemoveNotFound(request); 1400 if (!fork_record.removed and fork_record.event.stage == .draft and std.mem.eql(u8, fork_record.event.repo_id, &repo_id)) { 1401 const id = std.fmt.bytesToHex(parts.id, .lower); 1402 try fork.remove(io, allocator, server.users_dir, &user_id, &id, author); 1403 1404 const location = try std.fmt.allocPrint(allocator, "{s}/patches/drafts", .{parts.repo_base}); 1405 defer allocator.free(location); 1406 try request.respond("", .{ 1407 .status = .see_other, 1408 .keep_alive = false, 1409 .extra_headers = &.{.{ .name = "location", .value = location }}, 1410 }); 1411 return; 1412 } 1413 } 1414 }, 1415 .local => {}, 1416 }; 1417 1418 // a draft is its author's alone, which its removal above checks 1419 if (!try source.canModify(io, allocator, actor, parts.kind, &parts.id)) return respondForbidden(request); 1420 1421 switch (source.repo_kind) { 1422 inline else => |repo_kind| { 1423 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1424 defer any_repo.deinit(io, allocator); 1425 switch (any_repo) { 1426 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) { 1427 error.EventNotFound => return respondRemoveNotFound(request), 1428 else => |e| return e, 1429 }, 1430 } 1431 }, 1432 } 1433 1434 const id = std.fmt.bytesToHex(parts.id, .lower); 1435 const location = try std.fmt.allocPrint(allocator, "{s}/event:{s}/kind:{s}", .{ parts.repo_base, &id, @tagName(parts.kind) }); 1436 defer allocator.free(location); 1437 try request.respond("", .{ 1438 .status = .see_other, 1439 .keep_alive = false, 1440 .extra_headers = &.{.{ .name = "location", .value = location }}, 1441 }); 1442 } 1443 1444 fn respondRemoveNotFound(request: *std.http.Server.Request) !void { 1445 try request.respond("event not found", .{ 1446 .status = .not_found, 1447 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1448 }); 1449 } 1450 1451 fn updateDiscussion( 1452 io: std.Io, 1453 allocator: std.mem.Allocator, 1454 host: Host, 1455 repo_base: []const u8, 1456 id: *const [evt.event_id_size]u8, 1457 title: []const u8, 1458 labels: []const u8, 1459 description: []const u8, 1460 author: evt.CommitAuthor, 1461 ) !void { 1462 const request_repo = (try requestRepoSource(io, allocator, host, repo_base)) orelse return error.NotFound; 1463 defer request_repo.deinit(allocator); 1464 const source = request_repo.source; 1465 switch (source.repo_kind) { 1466 inline else => |repo_kind| { 1467 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1468 defer any_repo.deinit(io, allocator); 1469 switch (any_repo) { 1470 inline else => |*repo| try evt.Discussion.update(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, id, title, labels, description, author), 1471 } 1472 }, 1473 } 1474 } 1475 1476 // set the status of the issue the url names (base is 1477 // "/repo/<owner>/<name>/issue:<id>", identity elided in local mode) by 1478 // re-emitting its event, then redirect back to it 1479 fn handleThreadStatus( 1480 io: std.Io, 1481 request: *std.http.Server.Request, 1482 allocator: std.mem.Allocator, 1483 base: []const u8, 1484 host: Host, 1485 open: bool, 1486 ) !void { 1487 const not_found = "thread not found"; 1488 const parts = commentBaseParts(base) orelse { 1489 try request.respond(not_found, .{ 1490 .status = .not_found, 1491 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1492 }); 1493 return; 1494 }; 1495 1496 var author_arena = std.heap.ArenaAllocator.init(allocator); 1497 defer author_arena.deinit(); 1498 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return; 1499 const author = actor.author; 1500 { 1501 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1502 defer request_repo.deinit(allocator); 1503 if (!try request_repo.source.canModify(io, allocator, actor, parts.thread_kind, &parts.thread_id)) return respondForbidden(request); 1504 } 1505 1506 (switch (parts.thread_kind) { 1507 .issue => updateThread(evt.Issue, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .status = if (open) .open else .closed }, author), 1508 .patch => updateThread(evt.Patch, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .status = if (open) .open else .closed }, author), 1509 else => return respondRemoveNotFound(request), 1510 }) catch |err| switch (err) { 1511 error.NotFound => { 1512 try request.respond(not_found, .{ 1513 .status = .not_found, 1514 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1515 }); 1516 return; 1517 }, 1518 else => |e| return e, 1519 }; 1520 1521 // like logout, this is a bodyless POST, so close the connection rather than 1522 // letting the keep-alive path try to discard a body that isn't framed. 1523 try request.respond("", .{ 1524 .status = .see_other, 1525 .keep_alive = false, 1526 .extra_headers = &.{.{ .name = "location", .value = base }}, 1527 }); 1528 } 1529 1530 // replace a thread's editable fields. 1531 fn handleThreadEdit( 1532 io: std.Io, 1533 request: *std.http.Server.Request, 1534 allocator: std.mem.Allocator, 1535 base: []const u8, 1536 host: Host, 1537 parts: CommentBaseParts, 1538 ) !void { 1539 var author_arena = std.heap.ArenaAllocator.init(allocator); 1540 defer author_arena.deinit(); 1541 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return; 1542 const author = actor.author; 1543 1544 const body = try readFormBody(request, allocator); 1545 defer allocator.free(body); 1546 1547 const title = (try parseFormField(allocator, body, "title")) orelse try allocator.dupe(u8, ""); 1548 defer allocator.free(title); 1549 const labels = (try parseFormField(allocator, body, "labels")) orelse try allocator.dupe(u8, ""); 1550 defer allocator.free(labels); 1551 const description_crlf = (try parseFormField(allocator, body, "description")) orelse try allocator.dupe(u8, ""); 1552 defer allocator.free(description_crlf); 1553 // form submission normalizes textarea line breaks to CRLF; store plain 1554 // newlines so the text renders the same on every host 1555 const description = try std.mem.replaceOwned(u8, allocator, description_crlf, "\r\n", "\n"); 1556 defer allocator.free(description); 1557 const target_branch = (try parseFormField(allocator, body, "target_branch")) orelse try allocator.dupe(u8, ""); 1558 defer allocator.free(target_branch); 1559 1560 // invalid fields send the user back to the edit form 1561 const valid = switch (parts.thread_kind) { 1562 .issue => evt.Issue.fieldsValid(title, labels), 1563 .patch => evt.Patch.fieldsValid(title, labels), 1564 .discuss => evt.Discussion.fieldsValid(title, labels), 1565 else => unreachable, 1566 }; 1567 if (!valid) { 1568 const form_location = try std.fmt.allocPrint(allocator, "{s}/edit", .{base}); 1569 defer allocator.free(form_location); 1570 if (!evt.titleValid(title)) { 1571 return respondThreadFormFailure(request, allocator, host, form_location, requiredTitleFeedback(parts.thread_kind, title, labels, description, target_branch, null)); 1572 } 1573 try request.respond("", .{ 1574 .status = .see_other, 1575 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 1576 }); 1577 return; 1578 } 1579 1580 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1581 defer request_repo.deinit(allocator); 1582 1583 const draft_user_id = if (parts.thread_kind == .patch) actor.user_id else null; 1584 if (draft_user_id) |user_id| { 1585 const server = switch (host) { 1586 .server => |server| server, 1587 .local => unreachable, 1588 }; 1589 if (!evt.Patch.branchValid(target_branch) or !try request_repo.source.hasBranch(io, allocator, target_branch)) { 1590 const form_location = try std.fmt.allocPrint(allocator, "{s}/edit", .{base}); 1591 defer allocator.free(form_location); 1592 return respondThreadFormFailure(request, allocator, host, form_location, patchFeedback(.invalid_target_branch, title, labels, description, target_branch, null)); 1593 } 1594 const repo_id = evt.parseEventId(std.fs.path.basename(request_repo.source.path)) catch return respondRemoveNotFound(request); 1595 var admin_repo = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = server.admin_repo_path }); 1596 defer admin_repo.deinit(io, allocator); 1597 const id = std.fmt.bytesToHex(parts.thread_id, .lower); 1598 if (try pch.editDraft(.{}, io, allocator, server.users_dir, &admin_repo, .{ 1599 .id = id, 1600 .user_id = user_id, 1601 .repo_id = repo_id, 1602 .title = title, 1603 .labels = labels, 1604 .description = description, 1605 .target_branch = target_branch, 1606 .author = author, 1607 .timestamp = @intCast(std.Io.Timestamp.now(io, .real).toSeconds()), 1608 })) { 1609 try request.respond("", .{ 1610 .status = .see_other, 1611 .extra_headers = &.{.{ .name = "location", .value = base }}, 1612 }); 1613 return; 1614 } 1615 } 1616 1617 // a draft is its author's alone, which its edit above checks 1618 if (!try request_repo.source.canModify(io, allocator, actor, parts.thread_kind, &parts.thread_id)) return respondForbidden(request); 1619 1620 const not_found = switch (parts.thread_kind) { 1621 .issue => "issue not found", 1622 .patch => "patch not found", 1623 .discuss => "discussion not found", 1624 else => unreachable, 1625 }; 1626 (switch (parts.thread_kind) { 1627 .issue => updateThread(evt.Issue, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .fields = .{ 1628 .title = title, 1629 .labels = labels, 1630 .description = description, 1631 } }, author), 1632 .patch => updateThread(evt.Patch, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .fields = .{ 1633 .title = title, 1634 .labels = labels, 1635 .description = description, 1636 .target_branch = target_branch, 1637 } }, author), 1638 .discuss => updateDiscussion(io, allocator, host, parts.repo_base, &parts.thread_id, title, labels, description, author), 1639 else => unreachable, 1640 }) catch |err| switch (err) { 1641 error.NotFound => { 1642 try request.respond(not_found, .{ 1643 .status = .not_found, 1644 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1645 }); 1646 return; 1647 }, 1648 else => { 1649 if (parts.thread_kind != .patch) return err; 1650 const failure = ui.Session.FormFeedback.PatchFailure.fromError(err) orelse return err; 1651 const form_location = try std.fmt.allocPrint(allocator, "{s}/edit", .{base}); 1652 defer allocator.free(form_location); 1653 return respondThreadFormFailure(request, allocator, host, form_location, patchFeedback(failure, title, labels, description, target_branch, null)); 1654 }, 1655 }; 1656 1657 try request.respond("", .{ 1658 .status = .see_other, 1659 .extra_headers = &.{.{ .name = "location", .value = base }}, 1660 }); 1661 } 1662 1663 // resolve every conflicted field of the thread the url names 1664 fn handleThreadResolve( 1665 io: std.Io, 1666 request: *std.http.Server.Request, 1667 allocator: std.mem.Allocator, 1668 base: []const u8, 1669 host: Host, 1670 ) !void { 1671 const parts = commentBaseParts(base) orelse { 1672 try request.respond("thread not found", .{ 1673 .status = .not_found, 1674 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1675 }); 1676 return; 1677 }; 1678 1679 var author_arena = std.heap.ArenaAllocator.init(allocator); 1680 defer author_arena.deinit(); 1681 const author = ((try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .write)) orelse return).author; 1682 1683 const body = try readFormBody(request, allocator); 1684 defer allocator.free(body); 1685 1686 var field_arena = std.heap.ArenaAllocator.init(allocator); 1687 defer field_arena.deinit(); 1688 const aa = field_arena.allocator(); 1689 const title = try parseFormField(aa, body, "title"); 1690 const labels = try parseFormField(aa, body, "labels"); 1691 1692 // the hunk inputs are submitted as d0, d1, ...; form submission normalizes their 1693 // textarea line breaks to CRLF 1694 var hunks: std.ArrayList([]const u8) = .empty; 1695 var hunk_index: usize = 0; 1696 while (true) : (hunk_index += 1) { 1697 const name = try std.fmt.allocPrint(aa, "d{d}", .{hunk_index}); 1698 const submitted = (try parseFormField(aa, body, name)) orelse break; 1699 try hunks.append(aa, try std.mem.replaceOwned(u8, aa, submitted, "\r\n", "\n")); 1700 } 1701 1702 if (parts.comment_id != null or (parts.thread_kind != .issue and parts.thread_kind != .patch)) { 1703 try request.respond("thread not found", .{ 1704 .status = .not_found, 1705 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1706 }); 1707 return; 1708 } 1709 const route = ui.RoutablePage.fromUrl(base) orelse ui.RoutablePage.fromUrlLocal(base) orelse { 1710 try request.respond("thread not found", .{ 1711 .status = .not_found, 1712 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1713 }); 1714 return; 1715 }; 1716 const theirs: []const u8 = switch (route) { 1717 .repo_patches => |*patch| patch.theirs.slice(), 1718 .repo_issues => "", 1719 else => unreachable, 1720 }; 1721 const not_found = if (parts.thread_kind == .patch) "patch not found" else "issue not found"; 1722 1723 (switch (parts.thread_kind) { 1724 .issue => updateThread(evt.Issue, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .resolve = .{ 1725 .title = title, 1726 .labels = labels, 1727 .hunks = hunks.items, 1728 } }, author), 1729 .patch => updateThread(evt.Patch, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .resolve = .{ 1730 .title = title, 1731 .labels = labels, 1732 .hunks = hunks.items, 1733 .theirs = theirs, 1734 } }, author), 1735 else => unreachable, 1736 }) catch |err| switch (err) { 1737 error.NotFound => { 1738 try request.respond(not_found, .{ 1739 .status = .not_found, 1740 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1741 }); 1742 return; 1743 }, 1744 // invalid fields send the user back to the resolve form 1745 error.InvalidFields => { 1746 const form_location = try std.fmt.allocPrint(allocator, "{s}/resolve", .{base}); 1747 defer allocator.free(form_location); 1748 try request.respond("", .{ 1749 .status = .see_other, 1750 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 1751 }); 1752 return; 1753 }, 1754 else => |e| return e, 1755 }; 1756 1757 try request.respond("", .{ 1758 .status = .see_other, 1759 .extra_headers = &.{.{ .name = "location", .value = base }}, 1760 }); 1761 } 1762 1763 // the posted path drops the action's own segment, so the route it parses is 1764 // the undo page the action applies to, never the confirmation page itself 1765 fn handleUndo(io: std.Io, request: *std.http.Server.Request, allocator: std.mem.Allocator, base: []const u8, host: Host, action: enum { undo, clear }) !void { 1766 const route = (switch (host) { 1767 .local => ui.RoutablePage.fromUrlLocal(base), 1768 .server => ui.RoutablePage.fromUrl(base), 1769 }) orelse return respondRepoNotFound(request); 1770 if (route != .repo_undo) return respondRepoNotFound(request); 1771 const target = route.repo_undo; 1772 var arena = std.heap.ArenaAllocator.init(allocator); 1773 defer arena.deinit(); 1774 const repo_base = if (target.name.len == 0) "" else try std.fmt.allocPrint(arena.allocator(), "/repo/{s}", .{target.name.slice()}); 1775 _ = (try authorizeWrite(io, allocator, &arena, request, host, repo_base, .owner)) orelse return; 1776 const resolved = (try requestRepoSource(io, allocator, host, repo_base)) orelse return respondRepoNotFound(request); 1777 defer resolved.deinit(allocator); 1778 (switch (action) { 1779 .undo => ui.Repo.Undo.execute(io, allocator, resolved.source, target.index orelse return respondRepoNotFound(request)), 1780 .clear => ui.Repo.Undo.clearHistory(io, allocator, resolved.source), 1781 }) catch |err| switch (err) { 1782 error.NotFound, error.InvalidHistoryIndex, error.TransactionNotFound => return respondRepoNotFound(request), 1783 else => return err, 1784 }; 1785 const location = try (ui.RoutablePage.repoUndoRoute(target.name.slice(), null) orelse return error.RouteTooLong).toUrl(&arena); 1786 try request.respond("", .{ .status = .see_other, .keep_alive = false, .extra_headers = &.{.{ .name = "location", .value = location }} }); 1787 } 1788 1789 fn handleSync( 1790 io: std.Io, 1791 request: *std.http.Server.Request, 1792 allocator: std.mem.Allocator, 1793 base: []const u8, 1794 source: ui.RepoSource, 1795 ) !void { 1796 if (base.len != 0) { 1797 try request.respond("not found", .{ 1798 .status = .not_found, 1799 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1800 }); 1801 return; 1802 } 1803 1804 var owned_failure: ?[]u8 = null; 1805 defer if (owned_failure) |message| allocator.free(message); 1806 const failure: ?[]const u8 = blk: { 1807 owned_failure = ui.Repo.Events.sync(io, allocator, source) catch |err| break :blk @errorName(err); 1808 break :blk owned_failure; 1809 }; 1810 if (failure) |message| { 1811 var encoded: std.Io.Writer.Allocating = .init(allocator); 1812 defer encoded.deinit(); 1813 try std.Uri.Component.percentEncode(&encoded.writer, message, struct { 1814 fn isUnreserved(c: u8) bool { 1815 return std.ascii.isAlphanumeric(c) or c == '-' or c == '.' or c == '_' or c == '~'; 1816 } 1817 }.isUnreserved); 1818 const cookie = try std.fmt.allocPrint( 1819 allocator, 1820 local_flash_cookie ++ "=" ++ local_sync_failure_prefix ++ "{s}; Path=/; HttpOnly; SameSite=Strict", 1821 .{encoded.written()}, 1822 ); 1823 defer allocator.free(cookie); 1824 try request.respond("", .{ 1825 .status = .see_other, 1826 .extra_headers = &.{ 1827 .{ .name = "location", .value = "/events" }, 1828 .{ .name = "set-cookie", .value = cookie }, 1829 }, 1830 }); 1831 return; 1832 } 1833 1834 try request.respond("", .{ 1835 .status = .see_other, 1836 .extra_headers = &.{ 1837 .{ .name = "location", .value = "/events" }, 1838 .{ .name = "set-cookie", .value = local_flash_cookie ++ "=; Path=/; Max-Age=0" }, 1839 }, 1840 }); 1841 } 1842 1843 fn renderIndexHtml( 1844 io: std.Io, 1845 allocator: std.mem.Allocator, 1846 host: Host, 1847 session_token: ?[]const u8, 1848 session_data: ui.Session.Data, 1849 ) ![]const u8 { 1850 const template = (findEmbed("/index.html") orelse return error.MissingIndexAsset).body; 1851 1852 var page_arena = std.heap.ArenaAllocator.init(allocator); 1853 defer page_arena.deinit(); 1854 1855 // the server admin repo must outlive the page build, since the session's 1856 // moment reads from it. 1857 var repo_maybe: ?rp.Repo(.xit, evt.admin_repo_opts) = null; 1858 defer if (repo_maybe) |*repo| repo.deinit(io, allocator); 1859 1860 var session = switch (host) { 1861 .server => |server| blk: { 1862 // open the admin repo to read live user/repo data. 1863 repo_maybe = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = server.admin_repo_path }); 1864 const repo = if (repo_maybe) |*repo| repo else unreachable; 1865 var session = try ui.Session.init(&page_arena, repo, session_data); 1866 // the session dropped a user whose account was removed, so revoke 1867 // the token that named them 1868 if (session_token) |token| { 1869 if (session.data.user_id == null) server.session_store.remove(token); 1870 } 1871 // give the page builders filesystem access to the on-disk repos (a 1872 // sibling "users" dir next to the admin repo) so the Repo page can 1873 // read its files. 1874 session.users_dir = server.users_dir; 1875 break :blk session; 1876 }, 1877 .local => |local| ui.Session{ 1878 .data = session_data, 1879 .arena = &page_arena, 1880 .page_arena = &page_arena, 1881 .local = local, 1882 }, 1883 }; 1884 session.io = io; 1885 1886 var page = try ui.Page.init(session.page_arena, &session, session.data.current_page); 1887 var root = try ui.initRoot(allocator, &page, &session); 1888 defer root.deinit(allocator); 1889 1890 const snapshot: ui.Snapshot = .{ .page = page, .session = session.data }; 1891 1892 const content = try generateHtml(allocator, &root, &session); 1893 defer allocator.free(content); 1894 1895 // serialize the snapshot so the wasm side can parse it back without making 1896 // a second request. it's embedded raw in a <script type="application/json"> 1897 // block, whose content is raw text terminated only by "</script". in json, 1898 // '<' appears solely inside string values, so escaping every '<' (and '>' 1899 // for good measure) to its \uXXXX form yields equivalent json that can't 1900 // break out of the tag. 1901 var json: std.Io.Writer.Allocating = .init(allocator); 1902 defer json.deinit(); 1903 try std.json.Stringify.value(snapshot, .{}, &json.writer); 1904 1905 var json_escaped: std.ArrayList(u8) = .empty; 1906 defer json_escaped.deinit(allocator); 1907 for (json.written()) |c| switch (c) { 1908 '<' => try json_escaped.appendSlice(allocator, "\\u003c"), 1909 '>' => try json_escaped.appendSlice(allocator, "\\u003e"), 1910 else => try json_escaped.append(allocator, c), 1911 }; 1912 1913 var out: std.ArrayList(u8) = .empty; 1914 errdefer out.deinit(allocator); 1915 { 1916 var cursor: usize = 0; 1917 for (&[_]struct { needle: []const u8, replacement: []const u8 }{ 1918 .{ .needle = "{{{ HAXY_HTML }}}", .replacement = content }, 1919 .{ .needle = "{{{ HAXY_JSON }}}", .replacement = json_escaped.items }, 1920 }) |sub| { 1921 const idx = std.mem.indexOfPos(u8, template, cursor, sub.needle) orelse return error.MissingTemplateToken; 1922 try out.appendSlice(allocator, template[cursor..idx]); 1923 try out.appendSlice(allocator, sub.replacement); 1924 cursor = idx + sub.needle.len; 1925 } 1926 try out.appendSlice(allocator, template[cursor..]); 1927 } 1928 return try out.toOwnedSlice(allocator); 1929 } 1930 1931 fn findEmbed(request_path: []const u8) ?Embed { 1932 const path = if (std.mem.eql(u8, request_path, "/")) 1933 "index.html" 1934 else if (request_path.len > 1 and request_path[0] == '/') 1935 request_path[1..] 1936 else 1937 return null; 1938 1939 for (embeds) |embed| { 1940 if (std.mem.eql(u8, path, embed.path)) return embed; 1941 } 1942 return null; 1943 } 1944 1945 // emits the TUI grid cells as static HTML. each web-native Scroll becomes its 1946 // own absolutely-positioned, natively-scrollable <div> holding its full content, 1947 // rendered recursively so nested scrolls work. 1948 pub fn generateHtml(allocator: std.mem.Allocator, root: *ui.Widget, session: *ui.Session) ![]const u8 { 1949 const grid = root.getGrid() orelse return error.MissingGrid; 1950 const root_focus = root.getFocus(); 1951 1952 var out: std.ArrayList(u8) = .empty; 1953 errdefer out.deinit(allocator); 1954 1955 switch (root.*) { 1956 .background => |*background| { 1957 if (background.art.getGrid()) |art| { 1958 var position_buf: [64]u8 = undefined; 1959 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})); 1960 try renderPanel(allocator, &out, background.art.getFocus(), art, session, root_focus); 1961 try out.appendSlice(allocator, "</div>"); 1962 } 1963 }, 1964 else => {}, 1965 } 1966 try out.appendSlice(allocator, "<div class=\"grid-content\" data-key=\"panel:root\">"); 1967 try renderPanel(allocator, &out, root_focus, grid, session, root_focus); 1968 try out.appendSlice(allocator, "</div>"); 1969 try renderForms(allocator, &out, root_focus); 1970 return try out.toOwnedSlice(allocator); 1971 } 1972 1973 // render one panel — a focus subtree and its content grid — as HTML, recursing 1974 // once per web-native Scroll inside it. the root panel is the whole page; each 1975 // Scroll becomes a nested, natively-scrollable div holding its full content. 1976 // emits the panel's grid cells as text, leaving holes where child scrolls sit, 1977 // then the child scroll divs over those holes. 1978 fn renderPanel(allocator: std.mem.Allocator, output: *std.ArrayList(u8), focus: *Focus, grid: Grid, session: *ui.Session, root_focus: *Focus) !void { 1979 // `direct` is this panel's scroll children, each drawn as an overlaid div. 1980 // `excluded` is every focus id that belongs to a scroll (the scroll nodes 1981 // plus their descendants, which the focus tree flattens into this panel's 1982 // children): the cell hit-test below skips them so this panel doesn't claim 1983 // cells that are really rendered inside a child scroll's own panel. 1984 // (scrolls aren't nested in practice, so every scroll child is direct here.) 1985 var direct: std.ArrayList(usize) = .empty; 1986 defer direct.deinit(allocator); 1987 var excluded: std.AutoHashMapUnmanaged(usize, void) = .empty; 1988 defer excluded.deinit(allocator); 1989 { 1990 var it = focus.children.iterator(); 1991 while (it.next()) |e| { 1992 if (e.value_ptr.focus.scroll == null) continue; 1993 try direct.append(allocator, e.key_ptr.*); 1994 try excluded.put(allocator, e.key_ptr.*, {}); 1995 var mit = e.value_ptr.focus.children.iterator(); 1996 while (mit.next()) |m| try excluded.put(allocator, m.key_ptr.*, {}); 1997 } 1998 } 1999 2000 // the HTML element a run of cells is wrapped in, chosen from the cell's 2001 // focusable kind 2002 const CellTag = union(enum) { 2003 span, // clickable focusable cell 2004 a: []const u8, // clickable focusable link 2005 plain, // non-focusable, colored 2006 2007 const a_prefix = "a:"; 2008 // an "in-page" anchor: rendered as a real <a href> so it works with js 2009 // disabled, but wasm handles it without navigating. 2010 fn init(str: []const u8) @This() { 2011 if (std.mem.startsWith(u8, str, ui.raw_link_prefix)) { 2012 return .{ .a = str[ui.raw_link_prefix.len..] }; 2013 } 2014 if (std.mem.startsWith(u8, str, ui.in_page_link_prefix)) { 2015 return .{ .a = str[ui.in_page_link_prefix.len..] }; 2016 } 2017 if (std.mem.startsWith(u8, str, a_prefix)) { 2018 return .{ .a = str[a_prefix.len..] }; 2019 } 2020 return .span; 2021 } 2022 2023 fn writeOpenTag(self: @This(), alloc: std.mem.Allocator, out: *std.ArrayList(u8), id: usize, style_attr: []const u8) !void { 2024 var id_buf: [32]u8 = undefined; 2025 switch (self) { 2026 .span => { 2027 try out.appendSlice(alloc, "<span class=\"clickable\" data-focus-id=\""); 2028 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2029 try out.appendSlice(alloc, "\""); 2030 try out.appendSlice(alloc, style_attr); 2031 try out.appendSlice(alloc, ">"); 2032 }, 2033 .a => |href| { 2034 // tabindex=-1 keeps these out of the browser's tab order 2035 try out.appendSlice(alloc, "<a class=\"clickable\" tabindex=\"-1\" data-focus-id=\""); 2036 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2037 try out.appendSlice(alloc, "\" href=\""); 2038 try appendEscapedHtml(alloc, out, href); 2039 try out.appendSlice(alloc, "\""); 2040 try out.appendSlice(alloc, style_attr); 2041 try out.appendSlice(alloc, ">"); 2042 }, 2043 .plain => { 2044 try out.appendSlice(alloc, "<span"); 2045 try out.appendSlice(alloc, style_attr); 2046 try out.appendSlice(alloc, ">"); 2047 }, 2048 } 2049 } 2050 2051 fn closeTag(self: @This()) []const u8 { 2052 return switch (self) { 2053 .span, .plain => "</span>", 2054 .a => "</a>", 2055 }; 2056 } 2057 }; 2058 2059 // the focusable owning each cell, among this panel's own (skipping any 2060 // that belong to a child scroll, whose cells are drawn in their own panel). 2061 // claimed in focus order, so the first focusable over a cell keeps it. 2062 // looking every focusable up for every cell is quadratic in a long list. 2063 const owners = try allocator.alloc(?usize, grid.size.width * grid.size.height); 2064 defer allocator.free(owners); 2065 @memset(owners, null); 2066 { 2067 var it = focus.children.iterator(); 2068 while (it.next()) |entry| { 2069 const child = entry.value_ptr.*; 2070 if (child.focus.mode != .all) continue; 2071 if (excluded.contains(entry.key_ptr.*)) continue; 2072 const r = child.rect; 2073 for (@min(r.y, grid.size.height)..@min(r.y + r.size.height, grid.size.height)) |y| { 2074 for (@min(r.x, grid.size.width)..@min(r.x + r.size.width, grid.size.width)) |x| { 2075 const owner = &owners[y * grid.size.width + x]; 2076 if (owner.* == null) owner.* = entry.key_ptr.*; 2077 } 2078 } 2079 } 2080 } 2081 2082 // the cells are the volatile part of a panel. js replaces this one subtree 2083 // wholesale while retaining the panel's native controls and scroll shells. 2084 try output.appendSlice(allocator, "<div class=\"grid-cells\">"); 2085 2086 // emit this panel's grid as rows of text, coalescing adjacent cells that 2087 // share a focus id and style into one tag (a clickable span, a link, or a 2088 // plain styled span). cells under a child scroll keep only their background. 2089 // a cell's own link is an anchor nested in that tag. 2090 for (0..grid.size.height) |y| { 2091 var cur_id: ?usize = null; 2092 var cur_style: Grid.Style = .{}; 2093 var open_tag: ?CellTag = null; 2094 var open_link: ?[]const u8 = null; 2095 var first = true; 2096 for (0..grid.size.width) |x| { 2097 const cell = (try grid.cell(x, y)).*; 2098 // a cell covered by a child scroll's viewport is drawn by that scroll's 2099 // own div, so blank its glyph and make it non-clickable here — but keep 2100 // its background, so the backdrop still shows through the scroll's 2101 // transparent div instead of a bare hole. 2102 const covered_by_scroll = blk: { 2103 for (direct.items) |id| { 2104 const r = (focus.children.get(id) orelse continue).rect; 2105 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; 2106 } 2107 break :blk false; 2108 }; 2109 // the focusable owning the cell at (x, y); none for a covered cell. 2110 const cell_id = if (covered_by_scroll) null else owners[y * grid.size.width + x]; 2111 const style: Grid.Style = if (covered_by_scroll) .{ .bg = cell.style.bg } else cell.style; 2112 2113 if (first or cell_id != cur_id or !style.eql(cur_style)) { 2114 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2115 open_link = null; 2116 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2117 2118 var new_tag: ?CellTag = null; 2119 if (cell_id) |id| { 2120 if (focus.children.get(id)) |child| { 2121 new_tag = switch (child.focus.kind) { 2122 .custom => |custom| CellTag.init(custom), 2123 else => .span, 2124 }; 2125 } 2126 } 2127 if (new_tag == null and !style.eql(.{})) new_tag = .plain; 2128 2129 if (new_tag) |t| { 2130 var style_buf: [192]u8 = undefined; 2131 try t.writeOpenTag(allocator, output, cell_id orelse 0, styleAttr(&style_buf, style)); 2132 } 2133 2134 open_tag = new_tag; 2135 cur_id = cell_id; 2136 cur_style = style; 2137 first = false; 2138 } 2139 2140 // an anchor can't nest in another, so a link tag's cells skip theirs 2141 const in_anchor = if (open_tag) |t| t == .a else false; 2142 const link = if (covered_by_scroll or in_anchor) null else webLink(cell.link); 2143 if (!sameLink(link, open_link)) { 2144 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2145 if (link) |url| { 2146 try output.appendSlice(allocator, "<a class=\"cell-link\" tabindex=\"-1\" target=\"_blank\" rel=\"noopener noreferrer\" href=\""); 2147 try appendEscapedHtml(allocator, output, url); 2148 try output.appendSlice(allocator, "\">"); 2149 } 2150 open_link = link; 2151 } 2152 2153 if (covered_by_scroll) { 2154 try appendEscapedHtml(allocator, output, " "); 2155 } else if (cell.continuation) { 2156 // the wide rune to the left was emitted 2ch wide, covering this column 2157 } else if (cell.rune) |rune| { 2158 var encoded: [4]u8 = undefined; 2159 const encoded_len = try std.unicode.utf8Encode(rune, &encoded); 2160 const rune_text = encoded[0..encoded_len]; 2161 // a double-width rune is pinned inside a 2ch span so the 2162 // fallback glyph's advance width can't shift the rest of the row 2163 const wide = x + 1 < grid.size.width and (try grid.cell(x + 1, y)).continuation; 2164 if (wide) { 2165 try output.appendSlice(allocator, "<span class=\"w2\">"); 2166 try appendEscapedHtml(allocator, output, rune_text); 2167 try output.appendSlice(allocator, "</span>"); 2168 } else { 2169 try appendEscapedHtml(allocator, output, rune_text); 2170 } 2171 } else { 2172 try appendEscapedHtml(allocator, output, " "); 2173 } 2174 } 2175 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2176 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2177 try output.append(allocator, '\n'); 2178 } 2179 try output.appendSlice(allocator, "</div>"); 2180 2181 // native controls live in their panel, beside the replaceable cells. their 2182 // stable keys let JS update layout without recreating their DOM nodes, and 2183 // being actual descendants of a scroll gives them native movement/clipping. 2184 try renderPanelControls(allocator, output, focus, session, root_focus, &excluded); 2185 2186 // each child scroll becomes a natively-scrollable div positioned over its 2187 // viewport, holding its full content rendered recursively. 2188 for (direct.items) |id| { 2189 const child = focus.children.get(id) orelse continue; 2190 const info = child.focus.scroll orelse continue; 2191 const r = child.rect; 2192 // overflow only on the axes the widget scrolls; `auto` shows a bar only 2193 // when that axis actually overflows. the other axis is clipped (hidden), 2194 // matching how the terminal Scroll handles its non-scrolling axis. 2195 const overflow = switch (info.direction) { 2196 .vert => "overflow-x:hidden;overflow-y:auto", 2197 .horiz => "overflow-x:auto;overflow-y:hidden", 2198 .both => "overflow:auto", 2199 }; 2200 // the id carries a content version so JS preserves the native scroll 2201 // position across re-renders of the same content but resets it when the 2202 // content is replaced — e.g. selecting a different commit. the widget's 2203 // scroll offset (in cells) rides along so JS can apply it when it has no 2204 // preserved position, letting a wasm-side scrollToRect (the files list 2205 // scrolling to its selected row on page load) reach the browser. 2206 var buf: [256]u8 = undefined; 2207 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 })); 2208 try renderPanel(allocator, output, child.focus, info.content, session, root_focus); 2209 try output.appendSlice(allocator, "</div>"); 2210 } 2211 } 2212 2213 const form_prefix = "form:"; 2214 const form_id_prefix = "haxy-form-"; 2215 2216 fn formAction(focus: *const Focus) ?[]const u8 { 2217 return switch (focus.kind) { 2218 .custom => |custom| if (std.mem.startsWith(u8, custom, form_prefix)) custom[form_prefix.len..] else null, 2219 else => null, 2220 }; 2221 } 2222 2223 // find the form ancestor of a flattened focus-tree child. html's `form` 2224 // attribute then associates the control with that form without requiring the 2225 // form and control to share a DOM parent. 2226 fn formOwner(root_focus: *Focus, focus_id: usize) ?usize { 2227 var id = focus_id; 2228 while (root_focus.children.get(id)) |child| { 2229 const parent_id = child.parent_id; 2230 if (parent_id == root_focus.id) return if (formAction(root_focus) != null) root_focus.id else null; 2231 const parent = root_focus.children.get(parent_id) orelse return null; 2232 if (formAction(parent.focus) != null) return parent_id; 2233 id = parent_id; 2234 } 2235 return null; 2236 } 2237 2238 fn appendFormAttribute(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus, focus_id: usize) !void { 2239 const form_id = formOwner(root_focus, focus_id) orelse return; 2240 var buf: [64]u8 = undefined; 2241 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, " form=\"" ++ form_id_prefix ++ "{d}\"", .{form_id})); 2242 } 2243 2244 fn renderPanelControls( 2245 allocator: std.mem.Allocator, 2246 output: *std.ArrayList(u8), 2247 focus: *Focus, 2248 session: *ui.Session, 2249 root_focus: *Focus, 2250 excluded: *const std.AutoHashMapUnmanaged(usize, void), 2251 ) !void { 2252 var iter = focus.children.iterator(); 2253 while (iter.next()) |entry| { 2254 const id = entry.key_ptr.*; 2255 if (excluded.contains(id)) continue; 2256 const child = entry.value_ptr.*; 2257 const r = child.rect; 2258 2259 if (r.size.width == 0 or r.size.height == 0) continue; // not laid out, rather than merely off-screen 2260 2261 switch (child.focus.kind) { 2262 .text_input, .text_input_password, .text_area => { 2263 const ti = session.text_inputs.get(id) orelse continue; 2264 2265 const inner_left = r.x + 1; 2266 const inner_top = r.y + 1; 2267 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 2268 const preserve = !ti.options.read_only; 2269 2270 if (child.focus.kind == .text_area) { 2271 const value = try ti.text(allocator); 2272 defer allocator.free(value); 2273 var id_buf: [128]u8 = undefined; 2274 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<textarea data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2275 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2276 try appendFormAttribute(allocator, output, root_focus, id); 2277 if (ti.options.name.len > 0) { 2278 try output.appendSlice(allocator, " name=\""); 2279 try appendEscapedHtml(allocator, output, ti.options.name); 2280 try output.append(allocator, '"'); 2281 } 2282 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 2283 var pos_buf: [128]u8 = undefined; 2284 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 })); 2285 try appendEscapedHtml(allocator, output, value); 2286 try output.appendSlice(allocator, "</textarea>"); 2287 continue; 2288 } 2289 2290 var id_buf: [160]u8 = undefined; 2291 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 })); 2292 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2293 try appendFormAttribute(allocator, output, root_focus, id); 2294 if (ti.options.name.len > 0) { 2295 try output.appendSlice(allocator, " name=\""); 2296 try appendEscapedHtml(allocator, output, ti.options.name); 2297 try output.append(allocator, '"'); 2298 } 2299 if (child.focus.kind != .text_input_password) { 2300 const value = try ti.text(allocator); 2301 defer allocator.free(value); 2302 try output.appendSlice(allocator, " value=\""); 2303 try appendEscapedHtml(allocator, output, value); 2304 try output.append(allocator, '"'); 2305 } 2306 var pos_buf: [96]u8 = undefined; 2307 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 })); 2308 }, 2309 .custom => |custom| { 2310 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2311 if (formOwner(root_focus, id) == null) continue; 2312 var id_buf: [128]u8 = undefined; 2313 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2314 try appendFormAttribute(allocator, output, root_focus, id); 2315 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2316 try output.appendSlice(allocator, " formaction=\""); 2317 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2318 try output.append(allocator, '"'); 2319 } 2320 var pos_buf: [128]u8 = undefined; 2321 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 })); 2322 } else if (std.mem.startsWith(u8, custom, ui.radio_prefix)) { 2323 // an invisible native radio over the option, checked when the option is its row's selection 2324 const field = custom[ui.radio_prefix.len..]; 2325 const separator = std.mem.indexOfScalar(u8, field, '=') orelse continue; 2326 const row = root_focus.children.get(child.parent_id) orelse continue; 2327 var id_buf: [128]u8 = undefined; 2328 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2329 try appendFormAttribute(allocator, output, root_focus, id); 2330 try output.appendSlice(allocator, " name=\""); 2331 try appendEscapedHtml(allocator, output, field[0..separator]); 2332 try output.appendSlice(allocator, "\" value=\""); 2333 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2334 try output.append(allocator, '"'); 2335 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2336 var pos_buf: [128]u8 = undefined; 2337 try output.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, " style=\"opacity:0;left:{d}ch;top:{d}em;width:{d}ch;height:{d}em\">", .{ r.x, r.y, r.size.width, r.size.height })); 2338 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2339 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2340 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2341 var id_buf: [128]u8 = undefined; 2342 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 })); 2343 } 2344 }, 2345 else => {}, 2346 } 2347 } 2348 } 2349 2350 // emit hidden form owners beside the rendered panels. their controls point 2351 // back here with the standard HTML `form` attribute. 2352 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2353 // the focus child map preserves insertion order, which matches the order 2354 // widgets were added in code 2355 var iter = root_focus.children.iterator(); 2356 while (iter.next()) |entry| { 2357 const child = entry.value_ptr.*; 2358 const action_url = formAction(child.focus) orelse continue; 2359 2360 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2361 var id_buf: [96]u8 = undefined; 2362 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2363 try appendEscapedHtml(allocator, output, action_url); 2364 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2365 } 2366 } 2367 2368 // the 16 ansi colors as the browser shows them (xterm's defaults) 2369 const ansi_palette = [16]Grid.Color.Rgb{ 2370 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2371 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2372 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2373 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2374 }; 2375 2376 // resolve any color to rgb: palette colors through the ansi table and the 2377 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2378 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2379 return switch (color) { 2380 .rgb => |c| c, 2381 .ansi => |a| ansi_palette[@intFromEnum(a)], 2382 .indexed => |n| if (n < 16) 2383 ansi_palette[n] 2384 else if (n < 232) blk: { 2385 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2386 const i = n - 16; 2387 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2388 } else blk: { 2389 const v: u8 = 8 + (n - 232) * 10; 2390 break :blk .{ .r = v, .g = v, .b = v }; 2391 }, 2392 }; 2393 } 2394 2395 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2396 // cell's style into `buf`, omitting whichever color is unset. an inverted 2397 // cell swaps the two, falling back to the page's --fg/--bg variables for 2398 // whichever side is unset. text attributes follow the colors. returns an 2399 // empty slice when nothing is set. 2400 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2401 if (style.eql(.{})) return buf[0..0]; 2402 const prefix = " style=\""; 2403 @memcpy(buf[0..prefix.len], prefix); 2404 var i: usize = prefix.len; 2405 const inverted = style.inverted; 2406 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2407 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2408 const decoration: []const u8 = if (style.underline and style.strikethrough) 2409 "text-decoration:underline line-through;" 2410 else if (style.underline) 2411 "text-decoration:underline;" 2412 else if (style.strikethrough) 2413 "text-decoration:line-through;" 2414 else 2415 ""; 2416 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2417 if (style.bold) "font-weight:bold;" else "", 2418 if (style.italic) "font-style:italic;" else "", 2419 decoration, 2420 if (style.dim) "opacity:.6;" else "", 2421 }) catch return buf[0..0]; 2422 i += attributes.len; 2423 if (i >= buf.len) return buf[0..0]; 2424 buf[i] = '"'; 2425 return buf[0 .. i + 1]; 2426 } 2427 2428 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2429 // the color is unset (nothing when both are). returns the new end, or null 2430 // when it doesn't fit. 2431 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2432 const s = if (color) |c| blk: { 2433 const v = colorRgb(c); 2434 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; 2435 } else if (fallback) |f| 2436 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2437 else 2438 return i; 2439 return i + s.len; 2440 } 2441 2442 // a cell's link as an href, when it's a web or mail url 2443 fn webLink(link: ?[]const u8) ?[]const u8 { 2444 const url = link orelse return null; 2445 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2446 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2447 } 2448 return null; 2449 } 2450 2451 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2452 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2453 return b == null; 2454 } 2455 2456 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2457 for (input) |ch| { 2458 switch (ch) { 2459 '&' => try out.appendSlice(allocator, "&amp;"), 2460 '<' => try out.appendSlice(allocator, "&lt;"), 2461 '>' => try out.appendSlice(allocator, "&gt;"), 2462 '"' => try out.appendSlice(allocator, "&quot;"), 2463 '\'' => try out.appendSlice(allocator, "&#39;"), 2464 else => try out.append(allocator, ch), 2465 } 2466 } 2467 } 2468 2469 // --- helpers -------------------------------------------------------------- 2470 2471 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2472 var iter = request.iterateHeaders(); 2473 while (iter.next()) |header| { 2474 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2475 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2476 while (pairs.next()) |pair| { 2477 const trimmed = std.mem.trim(u8, pair, " \t"); 2478 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2479 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2480 return trimmed[eq + 1 ..]; 2481 } 2482 } 2483 } 2484 return null; 2485 } 2486 2487 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2488 var iter = std.mem.splitScalar(u8, body, '&'); 2489 while (iter.next()) |pair| { 2490 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2491 if (std.mem.eql(u8, pair[0..eq], key)) { 2492 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2493 } 2494 } 2495 return null; 2496 } 2497 2498 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2499 var buffer: [256]u8 = undefined; 2500 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2501 } 2502 2503 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2504 var out: std.ArrayList(u8) = .empty; 2505 errdefer out.deinit(allocator); 2506 var i: usize = 0; 2507 while (i < encoded.len) : (i += 1) { 2508 switch (encoded[i]) { 2509 '+' => try out.append(allocator, ' '), 2510 '%' => { 2511 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2512 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2513 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2514 try out.append(allocator, hi * 16 + lo); 2515 i += 2; 2516 }, 2517 else => try out.append(allocator, encoded[i]), 2518 } 2519 } 2520 return try out.toOwnedSlice(allocator); 2521 } 2522 2523 // disk-backed web session store. each login mints a random, opaque token 2524 // (not the user's id) that is stored as a file named by the token hex, whose 2525 // contents are the raw user_id bytes. authenticating a request is a lookup of 2526 // the cookie's token; logout deletes the file, revoking the session. there is 2527 // deliberately no expiry — a session lives until logout. form failures use 2528 // files in the flash subdirectory that the redirected GET consumes. the 2529 // directory is cleared whenever the server starts. 2530 pub const SessionStore = struct { 2531 io: std.Io, 2532 dir: std.Io.Dir, 2533 flash_dir: std.Io.Dir, 2534 auto_login: ?[token_hex_len]u8, 2535 2536 pub const token_hex_len = evt.event_id_size * 2; 2537 2538 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2539 try data_dir.createDirPath(io, "sessions"); 2540 const dir = try data_dir.openDir(io, "sessions", .{}); 2541 errdefer dir.close(io); 2542 try dir.deleteTree(io, "flash"); 2543 try dir.createDirPath(io, "flash"); 2544 const flash_dir = try dir.openDir(io, "flash", .{}); 2545 errdefer flash_dir.close(io); 2546 const auto_login = blk: { 2547 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2548 defer file.close(io); 2549 var token: [token_hex_len]u8 = undefined; 2550 var storage: [token_hex_len]u8 = undefined; 2551 var reader = file.reader(io, &storage); 2552 reader.interface.readSliceAll(&token) catch break :blk null; 2553 break :blk token; 2554 }; 2555 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2556 } 2557 2558 pub fn deinit(self: SessionStore) void { 2559 self.flash_dir.close(self.io); 2560 self.dir.close(self.io); 2561 } 2562 2563 // mint a new session for user_id, returning the token hex to set as the 2564 // cookie value. 2565 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 2566 var token: [evt.event_id_size]u8 = undefined; 2567 self.io.random(&token); 2568 const token_hex = std.fmt.bytesToHex(token, .lower); 2569 const file = try self.dir.createFile(self.io, &token_hex, .{}); 2570 defer file.close(self.io); 2571 try file.writeStreamingAll(self.io, user_id); 2572 return token_hex; 2573 } 2574 2575 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 2576 var token: [evt.event_id_size]u8 = undefined; 2577 self.io.random(&token); 2578 const token_hex = std.fmt.bytesToHex(token, .lower); 2579 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 2580 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 2581 defer file.close(self.io); 2582 2583 var json: std.Io.Writer.Allocating = .init(allocator); 2584 defer json.deinit(); 2585 try std.json.Stringify.value(value, .{}, &json.writer); 2586 try file.writeStreamingAll(self.io, json.written()); 2587 return token_hex; 2588 } 2589 2590 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 2591 if (!isToken(token_hex)) return null; 2592 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 2593 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 2594 defer file.close(self.io); 2595 2596 var storage: [4096]u8 = undefined; 2597 var reader = file.reader(self.io, &storage); 2598 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 2599 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 2600 } 2601 2602 // resolve a cookie's token to its user_id. returns false (logged out) for a 2603 // missing, malformed, or unknown token. 2604 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 2605 if (!isToken(token_hex)) return false; 2606 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 2607 defer file.close(self.io); 2608 var storage: [evt.event_id_size]u8 = undefined; 2609 var file_reader = file.reader(self.io, &storage); 2610 file_reader.interface.readSliceAll(out) catch return false; 2611 return true; 2612 } 2613 2614 // revoke a session. a no-op for a missing or malformed token. 2615 pub fn remove(self: SessionStore, token_hex: []const u8) void { 2616 if (!isToken(token_hex)) return; 2617 self.dir.deleteFile(self.io, token_hex) catch {}; 2618 } 2619 2620 // leave `token_hex`'s session for visitors arriving without one. only the 2621 // `try` fixture writes one. the name can't collide with a session token. 2622 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 2623 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 2624 defer file.close(self.io); 2625 try file.writeStreamingAll(self.io, token_hex); 2626 } 2627 2628 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 2629 out.* = self.auto_login orelse return false; 2630 return true; 2631 } 2632 2633 const auto_login_name = "auto-login"; 2634 2635 // a token is exactly token_hex_len hex chars. validating before using the 2636 // value as a path keeps attacker-supplied cookies from escaping the 2637 // sessions dir (e.g. via "/" or ".." bytes). 2638 fn isToken(token_hex: []const u8) bool { 2639 if (token_hex.len != token_hex_len) return false; 2640 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 2641 return true; 2642 } 2643 }; 2644