feat: add SupabaseFunctionsShelf

packages/supabase_functions/lib/supabase_functions_shelf.dart

@@ -0,0 +1,58 @@
+import 'dart:js_util' as js_util;
+
+import 'package:edge_runtime/edge_runtime.dart';
+import 'package:edge_runtime/src/interop/promise_interop.dart';
+import 'package:edge_runtime/src/response.dart';
+import 'package:js/js.dart';
+import 'package:js_bindings/js_bindings.dart' as interop;
+import 'package:shelf/shelf.dart' as shelf;
+
+export 'package:deno_deploy/deno_deploy.dart' hide Response;
+
+@JS('__dartSupabaseFetchHandler')
+external set __dartSupabaseFetchHandler(
+    Promise<interop.Response> Function(interop.Request req) f);
+
+class SupabaseFunctionsShelf {
+  final FutureOr<shelf.Response> Function(shelf.Request request)? fetch;
+
+  SupabaseFunctionsShelf({
+    this.fetch,
+  }) {
+    // Setup the runtime environment.
+    setupRuntime();
+
+    if (fetch != null) {
+      __dartSupabaseFetchHandler = allowInterop((interop.Request request) {
+        return futureToPromise(Future(() async {
+          final clone = request.clone();
+          final Map<String, String> headers = {};
+
+          js_util.callMethod(request.headers, 'forEach', [
+            allowInterop((value, key, _) {
+              headers[key] = value;
+            })
+          ]);
+
+          // Remove the first path segment, because it starts with `dart_edge/<actual-sub-path>`.
+          var uri = Uri.parse(clone.url);
+          uri = uri.replace(pathSegments: uri.pathSegments.skip(1));
+
+          final shelfRequest = shelf.Request(
+            clone.method,
+            uri,
+            body: clone.body,
+            headers: headers,
+          );
+          final response = await fetch!(shelfRequest);
+
+          return Response(
+            await response.readAsString(),
+            status: response.statusCode,
+            headers: Headers(response.headers),
+          ).delegate;
+        }));
+      });
+    }
+  }
+}

packages/supabase_functions/pubspec.yaml

@@ -13,6 +13,7 @@ dependencies:
   edge_runtime: ^0.0.4+1
   js_bindings: ^0.1.0
   js: ^0.6.5
+  shelf: ^1.4.0
 
 dev_dependencies:
   lints: ^2.0.0