Make local lambda server configurable

Package.swift

@@ -52,7 +52,10 @@ let package = Package(
         .target(name: "MockServer", dependencies: [
             .product(name: "NIOHTTP1", package: "swift-nio"),
         ]),
-        .target(name: "StringSample", dependencies: ["AWSLambdaRuntime"]),
+        .target(name: "StringSample", dependencies: [
+            .byName(name: "AWSLambdaRuntime"),
+            .byName(name: "AWSLambdaTesting"),
+        ]),
         .target(name: "CodableSample", dependencies: ["AWSLambdaRuntime"]),
     ]
 )

Sources/AWSLambdaTesting/APIGatewayV2Proxy.swift

@@ -0,0 +1,33 @@
+
+#if DEBUG
+import AWSLambdaEvents
+import NIO
+
+struct APIGatewayV2Proxy: LocalLambdaInvocationProxy {
+    let eventLoop: EventLoop
+
+    init(eventLoop: EventLoop) {
+        self.eventLoop = eventLoop
+    }
+
+    func invocation(from request: HTTPRequest) -> EventLoopFuture<ByteBuffer> {
+        switch (request.method, request.uri) {
+        case (.POST, "/invoke"):
+            guard let body = request.body else {
+                return self.eventLoop.makeFailedFuture(InvocationHTTPError(.init(status: .badRequest)))
+            }
+            return self.eventLoop.makeSucceededFuture(body)
+        default:
+            return self.eventLoop.makeFailedFuture(InvocationHTTPError(.init(status: .notFound)))
+        }
+    }
+
+    func processResult(_ result: ByteBuffer?) -> EventLoopFuture<HTTPResponse> {
+        self.eventLoop.makeSucceededFuture(.init(status: .ok, body: result))
+    }
+
+    func processError(_ error: ByteBuffer?) -> EventLoopFuture<HTTPResponse> {
+        self.eventLoop.makeSucceededFuture(.init(status: .internalServerError, body: error))
+    }
+}
+#endif