╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭a40064bb..╮ a40064bb.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (599) 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 │ ╰─────────────────────────────────╯
2034 var cur_style: Grid.Style = .{}; 2035 var open_tag: ?CellTag = null; 2036 var open_link: ?[]const u8 = null; 2037 var first = true; 2038 for (0..grid.size.width) |x| { 2039 const cell = (try grid.cell(x, y)).*; 2040 // a cell covered by a child scroll's viewport is drawn by that scroll's 2041 // own div, so blank its glyph and make it non-clickable here — but keep 2042 // its background, so the backdrop still shows through the scroll's 2043 // transparent div instead of a bare hole. 2044 const covered_by_scroll = blk: { 2045 for (direct.items) |id| { 2046 const r = (focus.children.get(id) orelse continue).rect; 2047 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; 2048 } 2049 break :blk false; 2050 }; 2051 // the focusable owning the cell at (x, y); none for a covered cell. 2052 const cell_id = if (covered_by_scroll) null else owners[y * grid.size.width + x]; 2053 const style: Grid.Style = if (covered_by_scroll) .{ .bg = cell.style.bg } else cell.style; 2054 2055 if (first or cell_id != cur_id or !style.eql(cur_style)) { 2056 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2057 open_link = null; 2058 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2059 2060 var new_tag: ?CellTag = null; 2061 if (cell_id) |id| { 2062 if (focus.children.get(id)) |child| { 2063 new_tag = switch (child.focus.kind) { 2064 .custom => |custom| CellTag.init(custom), 2065 else => .span, 2066 }; 2067 } 2068 } 2069 if (new_tag == null and !style.eql(.{})) new_tag = .plain; 2070 2071 if (new_tag) |t| { 2072 var style_buf: [192]u8 = undefined; 2073 try t.writeOpenTag(allocator, output, cell_id orelse 0, styleAttr(&style_buf, style)); 2074 } 2075 2076 open_tag = new_tag; 2077 cur_id = cell_id; 2078 cur_style = style; 2079 first = false; 2080 } 2081 2082 // an anchor can't nest in another, so a link tag's cells skip theirs 2083 const in_anchor = if (open_tag) |t| t == .a else false; 2084 const link = if (covered_by_scroll or in_anchor) null else webLink(cell.link); 2085 if (!sameLink(link, open_link)) { 2086 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2087 if (link) |url| { 2088 try output.appendSlice(allocator, "<a class=\"cell-link\" tabindex=\"-1\" target=\"_blank\" rel=\"noopener noreferrer\" href=\""); 2089 try appendEscapedHtml(allocator, output, url); 2090 try output.appendSlice(allocator, "\">"); 2091 } 2092 open_link = link; 2093 } 2094 2095 if (covered_by_scroll) { 2096 try appendEscapedHtml(allocator, output, " "); 2097 } else if (cell.continuation) { 2098 // the wide rune to the left was emitted 2ch wide, covering this column 2099 } else if (cell.rune) |rune| { 2100 var encoded: [4]u8 = undefined; 2101 const encoded_len = try std.unicode.utf8Encode(rune, &encoded); 2102 const rune_text = encoded[0..encoded_len]; 2103 // a double-width rune is pinned inside a 2ch span so the 2104 // fallback glyph's advance width can't shift the rest of the row 2105 const wide = x + 1 < grid.size.width and (try grid.cell(x + 1, y)).continuation; 2106 if (wide) { 2107 try output.appendSlice(allocator, "<span class=\"w2\">"); 2108 try appendEscapedHtml(allocator, output, rune_text); 2109 try output.appendSlice(allocator, "</span>"); 2110 } else { 2111 try appendEscapedHtml(allocator, output, rune_text); 2112 } 2113 } else { 2114 try appendEscapedHtml(allocator, output, " "); 2115 } 2116 } 2117 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2118 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2119 try output.append(allocator, '\n'); 2120 } 2121 try output.appendSlice(allocator, "</div>"); 2122 2123 // native controls live in their panel, beside the replaceable cells. their 2124 // stable keys let JS update layout without recreating their DOM nodes, and 2125 // being actual descendants of a scroll gives them native movement/clipping. 2126 try renderPanelControls(allocator, output, focus, session, root_focus, &excluded); 2127 2128 // each child scroll becomes a natively-scrollable div positioned over its 2129 // viewport, holding its full content rendered recursively. 2130 for (direct.items) |id| { 2131 const child = focus.children.get(id) orelse continue; 2132 const info = child.focus.scroll orelse continue; 2133 const r = child.rect; 2134 // overflow only on the axes the widget scrolls; `auto` shows a bar only 2135 // when that axis actually overflows. the other axis is clipped (hidden), 2136 // matching how the terminal Scroll handles its non-scrolling axis. 2137 const overflow = switch (info.direction) { 2138 .vert => "overflow-x:hidden;overflow-y:auto", 2139 .horiz => "overflow-x:auto;overflow-y:hidden", 2140 .both => "overflow:auto", 2141 }; 2142 // the id carries a content version so JS preserves the native scroll 2143 // position across re-renders of the same content but resets it when the 2144 // content is replaced — e.g. selecting a different commit. the widget's 2145 // scroll offset (in cells) rides along so JS can apply it when it has no 2146 // preserved position, letting a wasm-side scrollToRect (the files list 2147 // scrolling to its selected row on page load) reach the browser. 2148 var buf: [256]u8 = undefined; 2149 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 })); 2150 try renderPanel(allocator, output, child.focus, info.content, session, root_focus); 2151 try output.appendSlice(allocator, "</div>"); 2152 } 2153 } 2154 2155 const form_prefix = "form:"; 2156 const form_id_prefix = "haxy-form-"; 2157 2158 fn formAction(focus: *const Focus) ?[]const u8 { 2159 return switch (focus.kind) { 2160 .custom => |custom| if (std.mem.startsWith(u8, custom, form_prefix)) custom[form_prefix.len..] else null, 2161 else => null, 2162 }; 2163 } 2164 2165 // find the form ancestor of a flattened focus-tree child. html's `form` 2166 // attribute then associates the control with that form without requiring the 2167 // form and control to share a DOM parent. 2168 fn formOwner(root_focus: *Focus, focus_id: usize) ?usize { 2169 var id = focus_id; 2170 while (root_focus.children.get(id)) |child| { 2171 const parent_id = child.parent_id; 2172 if (parent_id == root_focus.id) return if (formAction(root_focus) != null) root_focus.id else null; 2173 const parent = root_focus.children.get(parent_id) orelse return null; 2174 if (formAction(parent.focus) != null) return parent_id; 2175 id = parent_id; 2176 } 2177 return null; 2178 } 2179 2180 fn appendFormAttribute(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus, focus_id: usize) !void { 2181 const form_id = formOwner(root_focus, focus_id) orelse return; 2182 var buf: [64]u8 = undefined; 2183 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, " form=\"" ++ form_id_prefix ++ "{d}\"", .{form_id})); 2184 } 2185 2186 fn renderPanelControls( 2187 allocator: std.mem.Allocator, 2188 output: *std.ArrayList(u8), 2189 focus: *Focus, 2190 session: *ui.Session, 2191 root_focus: *Focus, 2192 excluded: *const std.AutoHashMapUnmanaged(usize, void), 2193 ) !void { 2194 var iter = focus.children.iterator(); 2195 while (iter.next()) |entry| { 2196 const id = entry.key_ptr.*; 2197 if (excluded.contains(id)) continue; 2198 const child = entry.value_ptr.*; 2199 const r = child.rect; 2200 2201 if (r.size.width == 0 or r.size.height == 0) continue; // not laid out, rather than merely off-screen 2202 2203 switch (child.focus.kind) { 2204 .text_input, .text_input_password, .text_area => { 2205 const ti = session.text_inputs.get(id) orelse continue; 2206 2207 const inner_left = r.x + 1; 2208 const inner_top = r.y + 1; 2209 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 2210 const preserve = !ti.options.read_only; 2211 2212 if (child.focus.kind == .text_area) { 2213 const value = try ti.text(allocator); 2214 defer allocator.free(value); 2215 var id_buf: [128]u8 = undefined; 2216 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<textarea data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2217 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2218 try appendFormAttribute(allocator, output, root_focus, id); 2219 if (ti.options.name.len > 0) { 2220 try output.appendSlice(allocator, " name=\""); 2221 try appendEscapedHtml(allocator, output, ti.options.name); 2222 try output.append(allocator, '"'); 2223 } 2224 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 2225 var pos_buf: [128]u8 = undefined; 2226 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 })); 2227 try appendEscapedHtml(allocator, output, value); 2228 try output.appendSlice(allocator, "</textarea>"); 2229 continue; 2230 } 2231 2232 var id_buf: [160]u8 = undefined; 2233 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 })); 2234 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2235 try appendFormAttribute(allocator, output, root_focus, id); 2236 if (ti.options.name.len > 0) { 2237 try output.appendSlice(allocator, " name=\""); 2238 try appendEscapedHtml(allocator, output, ti.options.name); 2239 try output.append(allocator, '"'); 2240 } 2241 if (child.focus.kind != .text_input_password) { 2242 const value = try ti.text(allocator); 2243 defer allocator.free(value); 2244 try output.appendSlice(allocator, " value=\""); 2245 try appendEscapedHtml(allocator, output, value); 2246 try output.append(allocator, '"'); 2247 } 2248 var pos_buf: [96]u8 = undefined; 2249 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 })); 2250 }, 2251 .custom => |custom| { 2252 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2253 if (formOwner(root_focus, id) == null) continue; 2254 var id_buf: [128]u8 = undefined; 2255 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2256 try appendFormAttribute(allocator, output, root_focus, id); 2257 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2258 try output.appendSlice(allocator, " formaction=\""); 2259 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2260 try output.append(allocator, '"'); 2261 } 2262 var pos_buf: [128]u8 = undefined; 2263 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 })); 2264 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2265 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2266 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2267 var id_buf: [128]u8 = undefined; 2268 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 })); 2269 } 2270 }, 2271 else => {}, 2272 } 2273 } 2274 } 2275 2276 // emit hidden form owners beside the rendered panels. their controls point 2277 // back here with the standard HTML `form` attribute. 2278 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2279 // the focus child map preserves insertion order, which matches the order 2280 // widgets were added in code 2281 var iter = root_focus.children.iterator(); 2282 while (iter.next()) |entry| { 2283 const child = entry.value_ptr.*; 2284 const action_url = formAction(child.focus) orelse continue; 2285 2286 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2287 var id_buf: [96]u8 = undefined; 2288 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2289 try appendEscapedHtml(allocator, output, action_url); 2290 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2291 } 2292 } 2293 2294 // the 16 ansi colors as the browser shows them (xterm's defaults) 2295 const ansi_palette = [16]Grid.Color.Rgb{ 2296 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2297 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2298 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2299 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2300 }; 2301 2302 // resolve any color to rgb: palette colors through the ansi table and the 2303 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2304 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2305 return switch (color) { 2306 .rgb => |c| c, 2307 .ansi => |a| ansi_palette[@intFromEnum(a)], 2308 .indexed => |n| if (n < 16) 2309 ansi_palette[n] 2310 else if (n < 232) blk: { 2311 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2312 const i = n - 16; 2313 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2314 } else blk: { 2315 const v: u8 = 8 + (n - 232) * 10; 2316 break :blk .{ .r = v, .g = v, .b = v }; 2317 }, 2318 }; 2319 } 2320 2321 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2322 // cell's style into `buf`, omitting whichever color is unset. an inverted 2323 // cell swaps the two, falling back to the page's --fg/--bg variables for 2324 // whichever side is unset. text attributes follow the colors. returns an 2325 // empty slice when nothing is set. 2326 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2327 if (style.eql(.{})) return buf[0..0]; 2328 const prefix = " style=\""; 2329 @memcpy(buf[0..prefix.len], prefix); 2330 var i: usize = prefix.len; 2331 const inverted = style.inverted; 2332 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2333 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2334 const decoration: []const u8 = if (style.underline and style.strikethrough) 2335 "text-decoration:underline line-through;" 2336 else if (style.underline) 2337 "text-decoration:underline;" 2338 else if (style.strikethrough) 2339 "text-decoration:line-through;" 2340 else 2341 ""; 2342 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2343 if (style.bold) "font-weight:bold;" else "", 2344 if (style.italic) "font-style:italic;" else "", 2345 decoration, 2346 if (style.dim) "opacity:.6;" else "", 2347 }) catch return buf[0..0]; 2348 i += attributes.len; 2349 if (i >= buf.len) return buf[0..0]; 2350 buf[i] = '"'; 2351 return buf[0 .. i + 1]; 2352 } 2353 2354 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2355 // the color is unset (nothing when both are). returns the new end, or null 2356 // when it doesn't fit. 2357 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2358 const s = if (color) |c| blk: { 2359 const v = colorRgb(c); 2360 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; 2361 } else if (fallback) |f| 2362 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2363 else 2364 return i; 2365 return i + s.len; 2366 } 2367 2368 // a cell's link as an href, when it's a web or mail url 2369 fn webLink(link: ?[]const u8) ?[]const u8 { 2370 const url = link orelse return null; 2371 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2372 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2373 } 2374 return null; 2375 } 2376 2377 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2378 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2379 return b == null; 2380 } 2381 2382 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2383 for (input) |ch| { 2384 switch (ch) { 2385 '&' => try out.appendSlice(allocator, "&amp;"), 2386 '<' => try out.appendSlice(allocator, "&lt;"), 2387 '>' => try out.appendSlice(allocator, "&gt;"), 2388 '"' => try out.appendSlice(allocator, "&quot;"), 2389 '\'' => try out.appendSlice(allocator, "&#39;"), 2390 else => try out.append(allocator, ch), 2391 } 2392 } 2393 } 2394 2395 // --- helpers -------------------------------------------------------------- 2396 2397 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2398 var iter = request.iterateHeaders(); 2399 while (iter.next()) |header| { 2400 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2401 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2402 while (pairs.next()) |pair| { 2403 const trimmed = std.mem.trim(u8, pair, " \t"); 2404 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2405 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2406 return trimmed[eq + 1 ..]; 2407 } 2408 } 2409 } 2410 return null; 2411 } 2412 2413 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2414 var iter = std.mem.splitScalar(u8, body, '&'); 2415 while (iter.next()) |pair| { 2416 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2417 if (std.mem.eql(u8, pair[0..eq], key)) { 2418 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2419 } 2420 } 2421 return null; 2422 } 2423 2424 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2425 var buffer: [256]u8 = undefined; 2426 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2427 } 2428 2429 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2430 var out: std.ArrayList(u8) = .empty; 2431 errdefer out.deinit(allocator); 2432 var i: usize = 0; 2433 while (i < encoded.len) : (i += 1) { 2434 switch (encoded[i]) { 2435 '+' => try out.append(allocator, ' '), 2436 '%' => { 2437 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2438 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2439 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2440 try out.append(allocator, hi * 16 + lo); 2441 i += 2; 2442 }, 2443 else => try out.append(allocator, encoded[i]), 2444 } 2445 } 2446 return try out.toOwnedSlice(allocator); 2447 } 2448 2449 // disk-backed web session store. each login mints a random, opaque token 2450 // (not the user's id) that is stored as a file named by the token hex, whose 2451 // contents are the raw user_id bytes. authenticating a request is a lookup of 2452 // the cookie's token; logout deletes the file, revoking the session. there is 2453 // deliberately no expiry — a session lives until logout. form failures use 2454 // files in the flash subdirectory that the redirected GET consumes. the 2455 // directory is cleared whenever the server starts. 2456 pub const SessionStore = struct { 2457 io: std.Io, 2458 dir: std.Io.Dir, 2459 flash_dir: std.Io.Dir, 2460 auto_login: ?[token_hex_len]u8, 2461 2462 pub const token_hex_len = evt.event_id_size * 2; 2463 2464 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2465 try data_dir.createDirPath(io, "sessions"); 2466 const dir = try data_dir.openDir(io, "sessions", .{}); 2467 errdefer dir.close(io); 2468 try dir.deleteTree(io, "flash"); 2469 try dir.createDirPath(io, "flash"); 2470 const flash_dir = try dir.openDir(io, "flash", .{}); 2471 errdefer flash_dir.close(io); 2472 const auto_login = blk: { 2473 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2474 defer file.close(io); 2475 var token: [token_hex_len]u8 = undefined; 2476 var storage: [token_hex_len]u8 = undefined; 2477 var reader = file.reader(io, &storage); 2478 reader.interface.readSliceAll(&token) catch break :blk null; 2479 break :blk token; 2480 }; 2481 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2482 } 2483 2484 pub fn deinit(self: SessionStore) void { 2485 self.flash_dir.close(self.io); 2486 self.dir.close(self.io); 2487 } 2488 2489 // mint a new session for user_id, returning the token hex to set as the 2490 // cookie value. 2491 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 2492 var token: [evt.event_id_size]u8 = undefined; 2493 self.io.random(&token); 2494 const token_hex = std.fmt.bytesToHex(token, .lower); 2495 const file = try self.dir.createFile(self.io, &token_hex, .{}); 2496 defer file.close(self.io); 2497 try file.writeStreamingAll(self.io, user_id); 2498 return token_hex; 2499 } 2500 2501 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 2502 var token: [evt.event_id_size]u8 = undefined; 2503 self.io.random(&token); 2504 const token_hex = std.fmt.bytesToHex(token, .lower); 2505 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 2506 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 2507 defer file.close(self.io); 2508 2509 var json: std.Io.Writer.Allocating = .init(allocator); 2510 defer json.deinit(); 2511 try std.json.Stringify.value(value, .{}, &json.writer); 2512 try file.writeStreamingAll(self.io, json.written()); 2513 return token_hex; 2514 } 2515 2516 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 2517 if (!isToken(token_hex)) return null; 2518 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 2519 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 2520 defer file.close(self.io); 2521 2522 var storage: [4096]u8 = undefined; 2523 var reader = file.reader(self.io, &storage); 2524 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 2525 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 2526 } 2527 2528 // resolve a cookie's token to its user_id. returns false (logged out) for a 2529 // missing, malformed, or unknown token. 2530 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 2531 if (!isToken(token_hex)) return false; 2532 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 2533 defer file.close(self.io); 2534 var storage: [evt.event_id_size]u8 = undefined; 2535 var file_reader = file.reader(self.io, &storage); 2536 file_reader.interface.readSliceAll(out) catch return false; 2537 return true; 2538 } 2539 2540 // revoke a session. a no-op for a missing or malformed token. 2541 pub fn remove(self: SessionStore, token_hex: []const u8) void { 2542 if (!isToken(token_hex)) return; 2543 self.dir.deleteFile(self.io, token_hex) catch {}; 2544 } 2545 2546 // leave `token_hex`'s session for visitors arriving without one. only the 2547 // `try` fixture writes one. the name can't collide with a session token. 2548 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 2549 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 2550 defer file.close(self.io); 2551 try file.writeStreamingAll(self.io, token_hex); 2552 } 2553 2554 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 2555 out.* = self.auto_login orelse return false; 2556 return true; 2557 } 2558 2559 const auto_login_name = "auto-login"; 2560 2561 // a token is exactly token_hex_len hex chars. validating before using the 2562 // value as a path keeps attacker-supplied cookies from escaping the 2563 // sessions dir (e.g. via "/" or ".." bytes). 2564 fn isToken(token_hex: []const u8) bool { 2565 if (token_hex.len != token_hex_len) return false; 2566 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 2567 return true; 2568 } 2569 }; 2570