╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭3f5466a2..╮ 3f5466a2.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (630) 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 │ ╰─────────────────────────────────╯
2400 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2401 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2402 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2403 var id_buf: [128]u8 = undefined; 2404 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 })); 2405 } 2406 }, 2407 else => {}, 2408 } 2409 } 2410 } 2411 2412 // emit hidden form owners beside the rendered panels. their controls point 2413 // back here with the standard HTML `form` attribute. 2414 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2415 // the focus child map preserves insertion order, which matches the order 2416 // widgets were added in code 2417 var iter = root_focus.children.iterator(); 2418 while (iter.next()) |entry| { 2419 const child = entry.value_ptr.*; 2420 const action_url = formAction(child.focus) orelse continue; 2421 2422 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2423 var id_buf: [96]u8 = undefined; 2424 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2425 try appendEscapedHtml(allocator, output, action_url); 2426 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2427 } 2428 } 2429 2430 // the 16 ansi colors as the browser shows them (xterm's defaults) 2431 const ansi_palette = [16]Grid.Color.Rgb{ 2432 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2433 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2434 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2435 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2436 }; 2437 2438 // resolve any color to rgb: palette colors through the ansi table and the 2439 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2440 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2441 return switch (color) { 2442 .rgb => |c| c, 2443 .ansi => |a| ansi_palette[@intFromEnum(a)], 2444 .indexed => |n| if (n < 16) 2445 ansi_palette[n] 2446 else if (n < 232) blk: { 2447 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2448 const i = n - 16; 2449 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2450 } else blk: { 2451 const v: u8 = 8 + (n - 232) * 10; 2452 break :blk .{ .r = v, .g = v, .b = v }; 2453 }, 2454 }; 2455 } 2456 2457 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2458 // cell's style into `buf`, omitting whichever color is unset. an inverted 2459 // cell swaps the two, falling back to the page's --fg/--bg variables for 2460 // whichever side is unset. text attributes follow the colors. returns an 2461 // empty slice when nothing is set. 2462 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2463 if (style.eql(.{})) return buf[0..0]; 2464 const prefix = " style=\""; 2465 @memcpy(buf[0..prefix.len], prefix); 2466 var i: usize = prefix.len; 2467 const inverted = style.inverted; 2468 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2469 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2470 const decoration: []const u8 = if (style.underline and style.strikethrough) 2471 "text-decoration:underline line-through;" 2472 else if (style.underline) 2473 "text-decoration:underline;" 2474 else if (style.strikethrough) 2475 "text-decoration:line-through;" 2476 else 2477 ""; 2478 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2479 if (style.bold) "font-weight:bold;" else "", 2480 if (style.italic) "font-style:italic;" else "", 2481 decoration, 2482 if (style.dim) "opacity:.6;" else "", 2483 }) catch return buf[0..0]; 2484 i += attributes.len; 2485 if (i >= buf.len) return buf[0..0]; 2486 buf[i] = '"'; 2487 return buf[0 .. i + 1]; 2488 } 2489 2490 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2491 // the color is unset (nothing when both are). returns the new end, or null 2492 // when it doesn't fit. 2493 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2494 const s = if (color) |c| blk: { 2495 const v = colorRgb(c); 2496 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; 2497 } else if (fallback) |f| 2498 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2499 else 2500 return i; 2501 return i + s.len; 2502 } 2503 2504 // a cell's link as an href, when it's a web or mail url 2505 fn webLink(link: ?[]const u8) ?[]const u8 { 2506 const url = link orelse return null; 2507 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2508 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2509 } 2510 return null; 2511 } 2512 2513 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2514 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2515 return b == null; 2516 } 2517 2518 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2519 for (input) |ch| { 2520 switch (ch) { 2521 '&' => try out.appendSlice(allocator, "&amp;"), 2522 '<' => try out.appendSlice(allocator, "&lt;"), 2523 '>' => try out.appendSlice(allocator, "&gt;"), 2524 '"' => try out.appendSlice(allocator, "&quot;"), 2525 '\'' => try out.appendSlice(allocator, "&#39;"), 2526 else => try out.append(allocator, ch), 2527 } 2528 } 2529 } 2530 2531 // --- helpers -------------------------------------------------------------- 2532 2533 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2534 var iter = request.iterateHeaders(); 2535 while (iter.next()) |header| { 2536 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2537 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2538 while (pairs.next()) |pair| { 2539 const trimmed = std.mem.trim(u8, pair, " \t"); 2540 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2541 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2542 return trimmed[eq + 1 ..]; 2543 } 2544 } 2545 } 2546 return null; 2547 } 2548 2549 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2550 var iter = std.mem.splitScalar(u8, body, '&'); 2551 while (iter.next()) |pair| { 2552 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2553 if (std.mem.eql(u8, pair[0..eq], key)) { 2554 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2555 } 2556 } 2557 return null; 2558 } 2559 2560 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2561 var buffer: [256]u8 = undefined; 2562 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2563 } 2564 2565 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2566 var out: std.ArrayList(u8) = .empty; 2567 errdefer out.deinit(allocator); 2568 var i: usize = 0; 2569 while (i < encoded.len) : (i += 1) { 2570 switch (encoded[i]) { 2571 '+' => try out.append(allocator, ' '), 2572 '%' => { 2573 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2574 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2575 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2576 try out.append(allocator, hi * 16 + lo); 2577 i += 2; 2578 }, 2579 else => try out.append(allocator, encoded[i]), 2580 } 2581 } 2582 return try out.toOwnedSlice(allocator); 2583 } 2584 2585 // disk-backed web session store. each login mints a random, opaque token 2586 // (not the user's id) that is stored as a file named by the token hex, whose 2587 // contents are the raw user_id bytes. authenticating a request is a lookup of 2588 // the cookie's token; logout deletes the file, revoking the session. there is 2589 // deliberately no expiry — a session lives until logout. form failures use 2590 // files in the flash subdirectory that the redirected GET consumes. the 2591 // directory is cleared whenever the server starts. 2592 pub const SessionStore = struct { 2593 io: std.Io, 2594 dir: std.Io.Dir, 2595 flash_dir: std.Io.Dir, 2596 auto_login: ?[token_hex_len]u8, 2597 2598 pub const token_hex_len = evt.event_id_size * 2; 2599 2600 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2601 try data_dir.createDirPath(io, "sessions"); 2602 const dir = try data_dir.openDir(io, "sessions", .{}); 2603 errdefer dir.close(io); 2604 try dir.deleteTree(io, "flash"); 2605 try dir.createDirPath(io, "flash"); 2606 const flash_dir = try dir.openDir(io, "flash", .{}); 2607 errdefer flash_dir.close(io); 2608 const auto_login = blk: { 2609 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2610 defer file.close(io); 2611 var token: [token_hex_len]u8 = undefined; 2612 var storage: [token_hex_len]u8 = undefined; 2613 var reader = file.reader(io, &storage); 2614 reader.interface.readSliceAll(&token) catch break :blk null; 2615 break :blk token; 2616 }; 2617 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2618 } 2619 2620 pub fn deinit(self: SessionStore) void { 2621 self.flash_dir.close(self.io); 2622 self.dir.close(self.io); 2623 } 2624 2625 // mint a new session for user_id, returning the token hex to set as the 2626 // cookie value. 2627 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 2628 var token: [evt.event_id_size]u8 = undefined; 2629 self.io.random(&token); 2630 const token_hex = std.fmt.bytesToHex(token, .lower); 2631 const file = try self.dir.createFile(self.io, &token_hex, .{}); 2632 defer file.close(self.io); 2633 try file.writeStreamingAll(self.io, user_id); 2634 return token_hex; 2635 } 2636 2637 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 2638 var token: [evt.event_id_size]u8 = undefined; 2639 self.io.random(&token); 2640 const token_hex = std.fmt.bytesToHex(token, .lower); 2641 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 2642 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 2643 defer file.close(self.io); 2644 2645 var json: std.Io.Writer.Allocating = .init(allocator); 2646 defer json.deinit(); 2647 try std.json.Stringify.value(value, .{}, &json.writer); 2648 try file.writeStreamingAll(self.io, json.written()); 2649 return token_hex; 2650 } 2651 2652 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 2653 if (!isToken(token_hex)) return null; 2654 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 2655 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 2656 defer file.close(self.io); 2657 2658 var storage: [4096]u8 = undefined; 2659 var reader = file.reader(self.io, &storage); 2660 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 2661 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 2662 } 2663 2664 // resolve a cookie's token to its user_id. returns false (logged out) for a 2665 // missing, malformed, or unknown token. 2666 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 2667 if (!isToken(token_hex)) return false; 2668 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 2669 defer file.close(self.io); 2670 var storage: [evt.event_id_size]u8 = undefined; 2671 var file_reader = file.reader(self.io, &storage); 2672 file_reader.interface.readSliceAll(out) catch return false; 2673 return true; 2674 } 2675 2676 // revoke a session. a no-op for a missing or malformed token. 2677 pub fn remove(self: SessionStore, token_hex: []const u8) void { 2678 if (!isToken(token_hex)) return; 2679 self.dir.deleteFile(self.io, token_hex) catch {}; 2680 } 2681 2682 // leave `token_hex`'s session for visitors arriving without one. only the 2683 // `try` fixture writes one. the name can't collide with a session token. 2684 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 2685 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 2686 defer file.close(self.io); 2687 try file.writeStreamingAll(self.io, token_hex); 2688 } 2689 2690 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 2691 out.* = self.auto_login orelse return false; 2692 return true; 2693 } 2694 2695 const auto_login_name = "auto-login"; 2696 2697 // a token is exactly token_hex_len hex chars. validating before using the 2698 // value as a path keeps attacker-supplied cookies from escaping the 2699 // sessions dir (e.g. via "/" or ".." bytes). 2700 fn isToken(token_hex: []const u8) bool { 2701 if (token_hex.len != token_hex_len) return false; 2702 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 2703 return true; 2704 } 2705 }; 2706