fix(fiber): Fix fiber returning 500 internal server error

fiber/adapter.go

@@ -5,9 +5,12 @@ package fiberadapter
 
 import (
 	"context"
-	"io/ioutil"
+	"fmt"
+	"io"
+	"log"
 	"net"
 	"net/http"
+	"strings"
 
 	"github.com/aws/aws-lambda-go/events"
 	"github.com/gofiber/fiber/v2"
@@ -103,7 +106,7 @@ func (f *FiberLambda) adaptor(w http.ResponseWriter, r *http.Request) {
 	defer fasthttp.ReleaseRequest(req)
 
 	// Convert net/http -> fasthttp request
-	body, err := ioutil.ReadAll(r.Body)
+	body, err := io.ReadAll(r.Body)
 	if err != nil {
 		http.Error(w, utils.StatusMessage(fiber.StatusInternalServerError), fiber.StatusInternalServerError)
 		return
@@ -129,8 +132,16 @@ func (f *FiberLambda) adaptor(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
-	remoteAddr, err := net.ResolveTCPAddr("tcp", r.RemoteAddr)
+	// We need to make sure the net.ResolveTCPAddr call works as it expects a port
+	addrWithPort := r.RemoteAddr
+	if !strings.Contains(r.RemoteAddr, ":") {
+		addrWithPort = r.RemoteAddr + ":80" // assuming a default port
+	}
+
+	remoteAddr, err := net.ResolveTCPAddr("tcp", addrWithPort)
 	if err != nil {
+		fmt.Printf("could not resolve TCP address for addr %s\n", r.RemoteAddr)
+		log.Println(err)
 		http.Error(w, utils.StatusMessage(fiber.StatusInternalServerError), fiber.StatusInternalServerError)
 		return
 	}

fiber/fiberlambda_test.go

@@ -39,6 +39,39 @@ var _ = Describe("FiberLambda tests", func() {
 		})
 	})
 
+	Context("RemoteAddr handling", func() {
+		It("Properly parses the IP address", func() {
+			app := fiber.New()
+			app.Get("/ping", func(c *fiber.Ctx) error {
+				// make sure the ip address is actually set properly
+				Expect(c.Context().RemoteAddr().String()).To(Equal("8.8.8.8:80"))
+				return c.SendString("pong")
+			})
+
+			adapter := fiberadaptor.New(app)
+
+			req := events.APIGatewayProxyRequest{
+				Path:       "/ping",
+				HTTPMethod: "GET",
+				RequestContext: events.APIGatewayProxyRequestContext{
+					Identity: events.APIGatewayRequestIdentity{
+						SourceIP: "8.8.8.8",
+					},
+				},
+			}
+
+			resp, err := adapter.ProxyWithContext(context.Background(), req)
+
+			Expect(err).To(BeNil())
+			Expect(resp.StatusCode).To(Equal(200))
+
+			resp, err = adapter.Proxy(req)
+
+			Expect(err).To(BeNil())
+			Expect(resp.StatusCode).To(Equal(200))
+		})
+	})
+
 	Context("Request header", func() {
 		It("Check pass canonical header to fiber", func() {
 			app := fiber.New()