╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭7fcb7c5a..╮ 7fcb7c5a.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (647) 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 │ ╰─────────────────────────────────╯
2425 const row = root_focus.children.get(child.parent_id) orelse continue; 2426 var id_buf: [128]u8 = undefined; 2427 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2428 try appendFormAttribute(allocator, output, root_focus, id); 2429 try output.appendSlice(allocator, " name=\""); 2430 try appendEscapedHtml(allocator, output, field[0..separator]); 2431 try output.appendSlice(allocator, "\" value=\""); 2432 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2433 try output.append(allocator, '"'); 2434 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2435 var pos_buf: [128]u8 = undefined; 2436 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 })); 2437 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2438 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2439 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2440 var id_buf: [128]u8 = undefined; 2441 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 })); 2442 } 2443 }, 2444 else => {}, 2445 } 2446 } 2447 } 2448 2449 // emit hidden form owners beside the rendered panels. their controls point 2450 // back here with the standard HTML `form` attribute. 2451 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2452 // the focus child map preserves insertion order, which matches the order 2453 // widgets were added in code 2454 var iter = root_focus.children.iterator(); 2455 while (iter.next()) |entry| { 2456 const child = entry.value_ptr.*; 2457 const action_url = formAction(child.focus) orelse continue; 2458 2459 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2460 var id_buf: [96]u8 = undefined; 2461 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2462 try appendEscapedHtml(allocator, output, action_url); 2463 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2464 } 2465 } 2466 2467 // the 16 ansi colors as the browser shows them (xterm's defaults) 2468 const ansi_palette = [16]Grid.Color.Rgb{ 2469 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2470 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2471 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2472 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2473 }; 2474 2475 // resolve any color to rgb: palette colors through the ansi table and the 2476 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2477 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2478 return switch (color) { 2479 .rgb => |c| c, 2480 .ansi => |a| ansi_palette[@backingInt(a)], 2481 .indexed => |n| if (n < 16) 2482 ansi_palette[n] 2483 else if (n < 232) blk: { 2484 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2485 const i = n - 16; 2486 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2487 } else blk: { 2488 const v: u8 = 8 + (n - 232) * 10; 2489 break :blk .{ .r = v, .g = v, .b = v }; 2490 }, 2491 }; 2492 } 2493 2494 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2495 // cell's style into `buf`, omitting whichever color is unset. an inverted 2496 // cell swaps the two, falling back to the page's --fg/--bg variables for 2497 // whichever side is unset. text attributes follow the colors. returns an 2498 // empty slice when nothing is set. 2499 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2500 if (style.eql(.{})) return buf[0..0]; 2501 const prefix = " style=\""; 2502 @memcpy(buf[0..prefix.len], prefix); 2503 var i: usize = prefix.len; 2504 const inverted = style.inverted; 2505 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2506 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2507 const decoration: []const u8 = if (style.underline and style.strikethrough) 2508 "text-decoration:underline line-through;" 2509 else if (style.underline) 2510 "text-decoration:underline;" 2511 else if (style.strikethrough) 2512 "text-decoration:line-through;" 2513 else 2514 ""; 2515 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2516 if (style.bold) "font-weight:bold;" else "", 2517 if (style.italic) "font-style:italic;" else "", 2518 decoration, 2519 if (style.dim) "opacity:.6;" else "", 2520 }) catch return buf[0..0]; 2521 i += attributes.len; 2522 if (i >= buf.len) return buf[0..0]; 2523 buf[i] = '"'; 2524 return buf[0 .. i + 1]; 2525 } 2526 2527 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2528 // the color is unset (nothing when both are). returns the new end, or null 2529 // when it doesn't fit. 2530 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2531 const s = if (color) |c| blk: { 2532 const v = colorRgb(c); 2533 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; 2534 } else if (fallback) |f| 2535 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2536 else 2537 return i; 2538 return i + s.len; 2539 } 2540 2541 // a cell's link as an href, when it's a page path or a web or mail url 2542 fn webLink(link: ?[]const u8) ?[]const u8 { 2543 const url = link orelse return null; 2544 // a page path, not a protocol-relative url 2545 if (url.len > 1 and url[0] == '/' and url[1] != '/') return url; 2546 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2547 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2548 } 2549 return null; 2550 } 2551 2552 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2553 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2554 return b == null; 2555 } 2556 2557 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2558 for (input) |ch| { 2559 switch (ch) { 2560 '&' => try out.appendSlice(allocator, "&amp;"), 2561 '<' => try out.appendSlice(allocator, "&lt;"), 2562 '>' => try out.appendSlice(allocator, "&gt;"), 2563 '"' => try out.appendSlice(allocator, "&quot;"), 2564 '\'' => try out.appendSlice(allocator, "&#39;"), 2565 else => try out.append(allocator, ch), 2566 } 2567 } 2568 } 2569 2570 // --- helpers -------------------------------------------------------------- 2571 2572 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2573 var iter = request.iterateHeaders(); 2574 while (iter.next()) |header| { 2575 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2576 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2577 while (pairs.next()) |pair| { 2578 const trimmed = std.mem.trim(u8, pair, " \t"); 2579 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2580 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2581 return trimmed[eq + 1 ..]; 2582 } 2583 } 2584 } 2585 return null; 2586 } 2587 2588 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2589 var iter = std.mem.splitScalar(u8, body, '&'); 2590 while (iter.next()) |pair| { 2591 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2592 if (std.mem.eql(u8, pair[0..eq], key)) { 2593 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2594 } 2595 } 2596 return null; 2597 } 2598 2599 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2600 var buffer: [256]u8 = undefined; 2601 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2602 } 2603 2604 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2605 var out: std.ArrayList(u8) = .empty; 2606 errdefer out.deinit(allocator); 2607 var i: usize = 0; 2608 while (i < encoded.len) : (i += 1) { 2609 switch (encoded[i]) { 2610 '+' => try out.append(allocator, ' '), 2611 '%' => { 2612 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2613 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2614 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2615 try out.append(allocator, hi * 16 + lo); 2616 i += 2; 2617 }, 2618 else => try out.append(allocator, encoded[i]), 2619 } 2620 } 2621 return try out.toOwnedSlice(allocator); 2622 } 2623 2624 // disk-backed web session store. each login mints a random, opaque token 2625 // (not the user's id) that is stored as a file named by the token hex, whose 2626 // contents are the raw user_id bytes. authenticating a request is a lookup of 2627 // the cookie's token; logout deletes the file, revoking the session. there is 2628 // deliberately no expiry — a session lives until logout. form failures use 2629 // files in the flash subdirectory that the redirected GET consumes. the 2630 // directory is cleared whenever the server starts. 2631 pub const SessionStore = struct { 2632 io: std.Io, 2633 dir: std.Io.Dir, 2634 flash_dir: std.Io.Dir, 2635 auto_login: ?[token_hex_len]u8, 2636 2637 pub const token_hex_len = evt.event_id_size * 2; 2638 2639 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2640 try data_dir.createDirPath(io, "sessions"); 2641 const dir = try data_dir.openDir(io, "sessions", .{}); 2642 errdefer dir.close(io); 2643 try dir.deleteTree(io, "flash"); 2644 try dir.createDirPath(io, "flash"); 2645 const flash_dir = try dir.openDir(io, "flash", .{}); 2646 errdefer flash_dir.close(io); 2647 const auto_login = blk: { 2648 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2649 defer file.close(io); 2650 var token: [token_hex_len]u8 = undefined; 2651 var storage: [token_hex_len]u8 = undefined; 2652 var reader = file.reader(io, &storage); 2653 reader.interface.readSliceAll(&token) catch break :blk null; 2654 break :blk token; 2655 }; 2656 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2657 } 2658 2659 pub fn deinit(self: SessionStore) void { 2660 self.flash_dir.close(self.io); 2661 self.dir.close(self.io); 2662 } 2663 2664 // mint a new session for user_id, returning the token hex to set as the 2665 // cookie value. 2666 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 2667 var token: [evt.event_id_size]u8 = undefined; 2668 self.io.random(&token); 2669 const token_hex = std.fmt.bytesToHex(token, .lower); 2670 const file = try self.dir.createFile(self.io, &token_hex, .{}); 2671 defer file.close(self.io); 2672 try file.writeStreamingAll(self.io, user_id); 2673 return token_hex; 2674 } 2675 2676 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 2677 var token: [evt.event_id_size]u8 = undefined; 2678 self.io.random(&token); 2679 const token_hex = std.fmt.bytesToHex(token, .lower); 2680 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 2681 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 2682 defer file.close(self.io); 2683 2684 var json: std.Io.Writer.Allocating = .init(allocator); 2685 defer json.deinit(); 2686 try std.json.Stringify.value(value, .{}, &json.writer); 2687 try file.writeStreamingAll(self.io, json.written()); 2688 return token_hex; 2689 } 2690 2691 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 2692 if (!isToken(token_hex)) return null; 2693 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 2694 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 2695 defer file.close(self.io); 2696 2697 var storage: [4096]u8 = undefined; 2698 var reader = file.reader(self.io, &storage); 2699 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 2700 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 2701 } 2702 2703 // resolve a cookie's token to its user_id. returns false (logged out) for a 2704 // missing, malformed, or unknown token. 2705 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 2706 if (!isToken(token_hex)) return false; 2707 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 2708 defer file.close(self.io); 2709 var storage: [evt.event_id_size]u8 = undefined; 2710 var file_reader = file.reader(self.io, &storage); 2711 file_reader.interface.readSliceAll(out) catch return false; 2712 return true; 2713 } 2714 2715 // revoke a session. a no-op for a missing or malformed token. 2716 pub fn remove(self: SessionStore, token_hex: []const u8) void { 2717 if (!isToken(token_hex)) return; 2718 self.dir.deleteFile(self.io, token_hex) catch {}; 2719 } 2720 2721 // leave `token_hex`'s session for visitors arriving without one. only the 2722 // `try` fixture writes one. the name can't collide with a session token. 2723 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 2724 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 2725 defer file.close(self.io); 2726 try file.writeStreamingAll(self.io, token_hex); 2727 } 2728 2729 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 2730 out.* = self.auto_login orelse return false; 2731 return true; 2732 } 2733 2734 const auto_login_name = "auto-login"; 2735 2736 // a token is exactly token_hex_len hex chars. validating before using the 2737 // value as a path keeps attacker-supplied cookies from escaping the 2738 // sessions dir (e.g. via "/" or ".." bytes). 2739 fn isToken(token_hex: []const u8) bool { 2740 if (token_hex.len != token_hex_len) return false; 2741 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 2742 return true; 2743 } 2744 }; 2745