From 2dd4a19e2ee85a239edc87ace60194d35e53ea5f Mon Sep 17 00:00:00 2001
From: Bob Farrell <git@bob.frl>
Date: Mon, 5 May 2025 10:31:02 +0100
Subject: [PATCH] Public routing path

Set `public_routing_path` config option to specify a request path prefix
for public requests.
---
 demo/src/main.zig          |  4 ++++
 src/jetzig/config.zig      |  4 ++++
 src/jetzig/http/Server.zig | 11 +++++++++--
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/demo/src/main.zig b/demo/src/main.zig
index b306e70..454a95a 100644
--- a/demo/src/main.zig
+++ b/demo/src/main.zig
@@ -66,6 +66,10 @@ pub const jetzig_options = struct {
     // Path relative to cwd() to serve public content from. Symlinks are not followed.
     pub const public_content_path = "public";
 
+    /// Request path to map to public directory, e.g. if `public_routing_path` is `"/foo"` then a
+    /// request to `/foo/bar.png` will serve static content found in `public/bar.png`
+    pub const public_routing_path = "/";
+
     // HTTP buffer. Must be large enough to store all headers. This should typically not be modified.
     pub const http_buffer_size: usize = std.math.pow(usize, 2, 16);
 
diff --git a/src/jetzig/config.zig b/src/jetzig/config.zig
index da82dbc..9ac1d95 100644
--- a/src/jetzig/config.zig
+++ b/src/jetzig/config.zig
@@ -84,6 +84,10 @@ pub const max_connections: u16 = 512;
 /// Path relative to cwd() to serve public content from. Symlinks are not followed.
 pub const public_content_path = "public";
 
+/// Request path to map to public directory, e.g. if `public_routing_path` is `"/foo"` then a
+/// request to `/foo/bar.png` will serve static content found in `public/bar.png`
+pub const public_routing_path = "/";
+
 /// Middleware chain. Add any custom middleware here, or use middleware provided in
 /// `jetzig.middleware` (e.g. `jetzig.middleware.HtmxMiddleware`).
 pub const middleware = &.{};
diff --git a/src/jetzig/http/Server.zig b/src/jetzig/http/Server.zig
index 7c1e073..9aaed47 100644
--- a/src/jetzig/http/Server.zig
+++ b/src/jetzig/http/Server.zig
@@ -754,9 +754,16 @@ fn matchStaticResource(self: *Server, request: *jetzig.http.Request) !?StaticRes
 }
 
 fn matchPublicContent(self: *Server, request: *jetzig.http.Request) !?StaticResource {
-    if (request.path.file_path.len <= 1) return null;
+    const public_routing_path = comptime jetzig.config.get([]const u8, "public_routing_path");
+    if (!std.mem.startsWith(u8, request.path.file_path, public_routing_path)) return null;
     if (request.method != .GET) return null;
 
+    const match_path = if (comptime std.mem.endsWith(u8, public_routing_path, "/"))
+        request.path.file_path[public_routing_path.len..]
+    else if (request.path.file_path.len <= public_routing_path.len + 1) {
+        return null;
+    } else request.path.file_path[public_routing_path.len + 1 ..];
+
     var iterable_dir = std.fs.cwd().openDir(
         jetzig.config.get([]const u8, "public_content_path"),
         .{ .iterate = true, .no_follow = true },
@@ -777,7 +784,7 @@ fn matchPublicContent(self: *Server, request: *jetzig.http.Request) !?StaticReso
             _ = std.mem.replace(u8, file.path, std.fs.path.sep_str_windows, std.fs.path.sep_str_posix, &path_buffer);
             break :blk path_buffer[0..file.path.len];
         } else file.path;
-        if (std.mem.eql(u8, file_path, request.path.file_path[1..])) {
+        if (std.mem.eql(u8, file_path, match_path)) {
             const content = try iterable_dir.readFileAlloc(
                 request.allocator,
                 file_path,