Support for 'Data' field in controllers

src/main/controllers.zig

@@ -84,13 +84,39 @@ fn parseRouteArg(comptime T: type, segment: []const u8) !T {
     @compileError("Unsupported Type " ++ @typeName(T));
 }
 
-fn parseBody(comptime T: type, reader: anytype, alloc: std.mem.Allocator) !T {
+const BaseContentType = enum {
+    json,
+    url_encoded,
+    octet_stream,
+
+    other,
+};
+
+fn parseBody(comptime T: type, content_type: BaseContentType, reader: anytype, alloc: std.mem.Allocator) !T {
     const buf = try reader.readAllAlloc(alloc, 1 << 16);
     defer alloc.free(buf);
+
+    switch (content_type) {
+        .octet_stream, .json => {
             const body = try json_utils.parse(T, buf, alloc);
             defer json_utils.parseFree(body, alloc);
 
             return try util.deepClone(alloc, body);
+        },
+        else => return error.UnsupportedMediaType,
+    }
+}
+
+fn matchContentType(hdr: ?[]const u8) ?BaseContentType {
+    if (hdr) |h| {
+        if (std.ascii.eqlIgnoreCase(h, "application/x-www-form-urlencoded")) return .url_encoded;
+        if (std.ascii.eqlIgnoreCase(h, "application/json")) return .json;
+        if (std.ascii.eqlIgnoreCase(h, "application/octet-stream")) return .octet_stream;
+
+        return .other;
+    }
+
+    return null;
 }
 
 pub fn Context(comptime Route: type) type {
@@ -107,6 +133,8 @@ pub fn Context(comptime Route: type) type {
         // leave it as a simple string instead of void
         pub const Query = if (@hasDecl(Route, "Query")) Route.Query else void;
 
+        pub const Data = if (@hasDecl(Route, "Data")) Route.Data else void;
+
         base_request: *http.Request,
 
         allocator: std.mem.Allocator,
@@ -118,6 +146,7 @@ pub fn Context(comptime Route: type) type {
         args: Args,
         body: Body,
         query: Query,
+        data: Data,
 
         // TODO
         body_buf: ?[]const u8 = null,
@@ -144,9 +173,11 @@ pub fn Context(comptime Route: type) type {
             alloc: std.mem.Allocator,
             args: Args,
         ) !void {
+            const base_content_type = matchContentType(req.headers.get("Content-Type"));
+
             const body = if (Body != void) blk: {
                 var stream = req.body orelse return error.NoBody;
-                break :blk try parseBody(Body, stream.reader(), alloc);
+                break :blk try parseBody(Body, base_content_type orelse .json, stream.reader(), alloc);
             } else {};
             defer if (Body != void) util.deepFree(alloc, body);
 
@@ -157,6 +188,21 @@ pub fn Context(comptime Route: type) type {
                 break :blk try query_utils.parseQuery(Query, q);
             };
 
+            var should_free_data: bool = false;
+            const data = if (Data != void) blk: {
+                if (Query != void or Body != void) @compileError("Cannot specify both Data and Query/Body");
+                if (base_content_type == .url_encoded) {
+                    const path = std.mem.sliceTo(req.uri, '?');
+                    const q = req.uri[path.len..];
+                    break :blk try query_utils.parseQuery(Query, q);
+                } else {
+                    should_free_data = true;
+                    var stream = req.body orelse return error.NoBody;
+                    break :blk try parseBody(Body, base_content_type orelse .json, stream.reader(), alloc);
+                }
+            };
+            defer if (should_free_data) util.deepFree(alloc, data);
+
             var api_conn = conn: {
                 const host = req.headers.get("Host") orelse return error.NoHost;
                 const auth_header = req.headers.get("Authorization");
@@ -184,6 +230,7 @@ pub fn Context(comptime Route: type) type {
                 .args = args,
                 .body = body,
                 .query = query,
+                .data = data,
             };
 
             try Route.handler(self, res, &api_conn);