╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭336d7ed3..╮ 336d7ed3.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (619) 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 │ ╰─────────────────────────────────╯
2372 try output.appendSlice(allocator, " formaction=\""); 2373 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2374 try output.append(allocator, '"'); 2375 } 2376 var pos_buf: [128]u8 = undefined; 2377 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 })); 2378 } else if (std.mem.startsWith(u8, custom, ui.radio_prefix)) { 2379 // an invisible native radio over the option, checked when the option is its row's selection 2380 const field = custom[ui.radio_prefix.len..]; 2381 const separator = std.mem.indexOfScalar(u8, field, '=') orelse continue; 2382 const row = root_focus.children.get(child.parent_id) orelse continue; 2383 var id_buf: [128]u8 = undefined; 2384 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2385 try appendFormAttribute(allocator, output, root_focus, id); 2386 try output.appendSlice(allocator, " name=\""); 2387 try appendEscapedHtml(allocator, output, field[0..separator]); 2388 try output.appendSlice(allocator, "\" value=\""); 2389 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2390 try output.append(allocator, '"'); 2391 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2392 var pos_buf: [128]u8 = undefined; 2393 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 })); 2394 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2395 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2396 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2397 var id_buf: [128]u8 = undefined; 2398 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 })); 2399 } 2400 }, 2401 else => {}, 2402 } 2403 } 2404 } 2405 2406 // emit hidden form owners beside the rendered panels. their controls point 2407 // back here with the standard HTML `form` attribute. 2408 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2409 // the focus child map preserves insertion order, which matches the order 2410 // widgets were added in code 2411 var iter = root_focus.children.iterator(); 2412 while (iter.next()) |entry| { 2413 const child = entry.value_ptr.*; 2414 const action_url = formAction(child.focus) orelse continue; 2415 2416 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2417 var id_buf: [96]u8 = undefined; 2418 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2419 try appendEscapedHtml(allocator, output, action_url); 2420 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2421 } 2422 } 2423 2424 // the 16 ansi colors as the browser shows them (xterm's defaults) 2425 const ansi_palette = [16]Grid.Color.Rgb{ 2426 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2427 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2428 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2429 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2430 }; 2431 2432 // resolve any color to rgb: palette colors through the ansi table and the 2433 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2434 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2435 return switch (color) { 2436 .rgb => |c| c, 2437 .ansi => |a| ansi_palette[@intFromEnum(a)], 2438 .indexed => |n| if (n < 16) 2439 ansi_palette[n] 2440 else if (n < 232) blk: { 2441 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2442 const i = n - 16; 2443 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2444 } else blk: { 2445 const v: u8 = 8 + (n - 232) * 10; 2446 break :blk .{ .r = v, .g = v, .b = v }; 2447 }, 2448 }; 2449 } 2450 2451 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2452 // cell's style into `buf`, omitting whichever color is unset. an inverted 2453 // cell swaps the two, falling back to the page's --fg/--bg variables for 2454 // whichever side is unset. text attributes follow the colors. returns an 2455 // empty slice when nothing is set. 2456 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2457 if (style.eql(.{})) return buf[0..0]; 2458 const prefix = " style=\""; 2459 @memcpy(buf[0..prefix.len], prefix); 2460 var i: usize = prefix.len; 2461 const inverted = style.inverted; 2462 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2463 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2464 const decoration: []const u8 = if (style.underline and style.strikethrough) 2465 "text-decoration:underline line-through;" 2466 else if (style.underline) 2467 "text-decoration:underline;" 2468 else if (style.strikethrough) 2469 "text-decoration:line-through;" 2470 else 2471 ""; 2472 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2473 if (style.bold) "font-weight:bold;" else "", 2474 if (style.italic) "font-style:italic;" else "", 2475 decoration, 2476 if (style.dim) "opacity:.6;" else "", 2477 }) catch return buf[0..0]; 2478 i += attributes.len; 2479 if (i >= buf.len) return buf[0..0]; 2480 buf[i] = '"'; 2481 return buf[0 .. i + 1]; 2482 } 2483 2484 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2485 // the color is unset (nothing when both are). returns the new end, or null 2486 // when it doesn't fit. 2487 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2488 const s = if (color) |c| blk: { 2489 const v = colorRgb(c); 2490 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; 2491 } else if (fallback) |f| 2492 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2493 else 2494 return i; 2495 return i + s.len; 2496 } 2497 2498 // a cell's link as an href, when it's a web or mail url 2499 fn webLink(link: ?[]const u8) ?[]const u8 { 2500 const url = link orelse return null; 2501 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2502 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2503 } 2504 return null; 2505 } 2506 2507 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2508 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2509 return b == null; 2510 } 2511 2512 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2513 for (input) |ch| { 2514 switch (ch) { 2515 '&' => try out.appendSlice(allocator, "&amp;"), 2516 '<' => try out.appendSlice(allocator, "&lt;"), 2517 '>' => try out.appendSlice(allocator, "&gt;"), 2518 '"' => try out.appendSlice(allocator, "&quot;"), 2519 '\'' => try out.appendSlice(allocator, "&#39;"), 2520 else => try out.append(allocator, ch), 2521 } 2522 } 2523 } 2524 2525 // --- helpers -------------------------------------------------------------- 2526 2527 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2528 var iter = request.iterateHeaders(); 2529 while (iter.next()) |header| { 2530 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2531 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2532 while (pairs.next()) |pair| { 2533 const trimmed = std.mem.trim(u8, pair, " \t"); 2534 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2535 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2536 return trimmed[eq + 1 ..]; 2537 } 2538 } 2539 } 2540 return null; 2541 } 2542 2543 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2544 var iter = std.mem.splitScalar(u8, body, '&'); 2545 while (iter.next()) |pair| { 2546 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2547 if (std.mem.eql(u8, pair[0..eq], key)) { 2548 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2549 } 2550 } 2551 return null; 2552 } 2553 2554 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2555 var buffer: [256]u8 = undefined; 2556 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2557 } 2558 2559 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2560 var out: std.ArrayList(u8) = .empty; 2561 errdefer out.deinit(allocator); 2562 var i: usize = 0; 2563 while (i < encoded.len) : (i += 1) { 2564 switch (encoded[i]) { 2565 '+' => try out.append(allocator, ' '), 2566 '%' => { 2567 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2568 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2569 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2570 try out.append(allocator, hi * 16 + lo); 2571 i += 2; 2572 }, 2573 else => try out.append(allocator, encoded[i]), 2574 } 2575 } 2576 return try out.toOwnedSlice(allocator); 2577 } 2578 2579 // disk-backed web session store. each login mints a random, opaque token 2580 // (not the user's id) that is stored as a file named by the token hex, whose 2581 // contents are the raw user_id bytes. authenticating a request is a lookup of 2582 // the cookie's token; logout deletes the file, revoking the session. there is 2583 // deliberately no expiry — a session lives until logout. form failures use 2584 // files in the flash subdirectory that the redirected GET consumes. the 2585 // directory is cleared whenever the server starts. 2586 pub const SessionStore = struct { 2587 io: std.Io, 2588 dir: std.Io.Dir, 2589 flash_dir: std.Io.Dir, 2590 auto_login: ?[token_hex_len]u8, 2591 2592 pub const token_hex_len = evt.event_id_size * 2; 2593 2594 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2595 try data_dir.createDirPath(io, "sessions"); 2596 const dir = try data_dir.openDir(io, "sessions", .{}); 2597 errdefer dir.close(io); 2598 try dir.deleteTree(io, "flash"); 2599 try dir.createDirPath(io, "flash"); 2600 const flash_dir = try dir.openDir(io, "flash", .{}); 2601 errdefer flash_dir.close(io); 2602 const auto_login = blk: { 2603 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2604 defer file.close(io); 2605 var token: [token_hex_len]u8 = undefined; 2606 var storage: [token_hex_len]u8 = undefined; 2607 var reader = file.reader(io, &storage); 2608 reader.interface.readSliceAll(&token) catch break :blk null; 2609 break :blk token; 2610 }; 2611 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2612 } 2613 2614 pub fn deinit(self: SessionStore) void { 2615 self.flash_dir.close(self.io); 2616 self.dir.close(self.io); 2617 } 2618 2619 // mint a new session for user_id, returning the token hex to set as the 2620 // cookie value. 2621 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 2622 var token: [evt.event_id_size]u8 = undefined; 2623 self.io.random(&token); 2624 const token_hex = std.fmt.bytesToHex(token, .lower); 2625 const file = try self.dir.createFile(self.io, &token_hex, .{}); 2626 defer file.close(self.io); 2627 try file.writeStreamingAll(self.io, user_id); 2628 return token_hex; 2629 } 2630 2631 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 2632 var token: [evt.event_id_size]u8 = undefined; 2633 self.io.random(&token); 2634 const token_hex = std.fmt.bytesToHex(token, .lower); 2635 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 2636 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 2637 defer file.close(self.io); 2638 2639 var json: std.Io.Writer.Allocating = .init(allocator); 2640 defer json.deinit(); 2641 try std.json.Stringify.value(value, .{}, &json.writer); 2642 try file.writeStreamingAll(self.io, json.written()); 2643 return token_hex; 2644 } 2645 2646 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 2647 if (!isToken(token_hex)) return null; 2648 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 2649 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 2650 defer file.close(self.io); 2651 2652 var storage: [4096]u8 = undefined; 2653 var reader = file.reader(self.io, &storage); 2654 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 2655 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 2656 } 2657 2658 // resolve a cookie's token to its user_id. returns false (logged out) for a 2659 // missing, malformed, or unknown token. 2660 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 2661 if (!isToken(token_hex)) return false; 2662 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 2663 defer file.close(self.io); 2664 var storage: [evt.event_id_size]u8 = undefined; 2665 var file_reader = file.reader(self.io, &storage); 2666 file_reader.interface.readSliceAll(out) catch return false; 2667 return true; 2668 } 2669 2670 // revoke a session. a no-op for a missing or malformed token. 2671 pub fn remove(self: SessionStore, token_hex: []const u8) void { 2672 if (!isToken(token_hex)) return; 2673 self.dir.deleteFile(self.io, token_hex) catch {}; 2674 } 2675 2676 // leave `token_hex`'s session for visitors arriving without one. only the 2677 // `try` fixture writes one. the name can't collide with a session token. 2678 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 2679 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 2680 defer file.close(self.io); 2681 try file.writeStreamingAll(self.io, token_hex); 2682 } 2683 2684 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 2685 out.* = self.auto_login orelse return false; 2686 return true; 2687 } 2688 2689 const auto_login_name = "auto-login"; 2690 2691 // a token is exactly token_hex_len hex chars. validating before using the 2692 // value as a path keeps attacker-supplied cookies from escaping the 2693 // sessions dir (e.g. via "/" or ".." bytes). 2694 fn isToken(token_hex: []const u8) bool { 2695 if (token_hex.len != token_hex_len) return false; 2696 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 2697 return true; 2698 } 2699 }; 2700