Custom host

core/request.go

@@ -11,11 +11,18 @@ import (
 	"log"
 	"net/http"
 	"net/url"
+	"os"
 	"strings"
 
 	"github.com/aws/aws-lambda-go/events"
 )
 
+// CustomHostVariable is the name of the environment variable that contains
+// the custom hostname for the request. If this variable is not set the framework
+// reverts to `DefaultServerAddress`. The value for a custom host should include
+// a protocol: http://my-custom.host.com
+const CustomHostVariable = "GO_API_HOST"
+
 // DefaultServerAddress is prepended to the path of each incoming reuqest
 const DefaultServerAddress = "https://aws-serverless-go-api.com"
 
@@ -128,13 +135,17 @@ func (r *RequestAccessor) ProxyEventToHTTPRequest(req events.APIGatewayProxyRequ
 	if r.stripBasePath != "" && len(r.stripBasePath) > 1 {
 		if strings.HasPrefix(path, r.stripBasePath) {
 			path = strings.Replace(path, r.stripBasePath, "", 1)
-			if !strings.HasPrefix(path, "/") {
-				path = "/" + path
-			}
 		}
 	}
+	if !strings.HasPrefix(path, "/") {
+		path = "/" + path
+	}
+	serverAddress := DefaultServerAddress
+	if customAddress, ok := os.LookupEnv(CustomHostVariable); ok {
+		serverAddress = customAddress
+	}
 
-	path = DefaultServerAddress + path
+	path = serverAddress + path
 
 	httpRequest, err := http.NewRequest(
 		strings.ToUpper(req.HTTPMethod),

core/request_test.go

@@ -4,6 +4,7 @@ import (
 	"encoding/base64"
 	"io/ioutil"
 	"math/rand"
+	"os"
 
 	"github.com/aws/aws-lambda-go/events"
 	"github.com/awslabs/aws-lambda-go-api-proxy/core"
@@ -149,6 +150,42 @@ var _ = Describe("RequestAccessor tests", func() {
 			Expect("value1").To(Equal(stageVars["var1"]))
 			Expect("value2").To(Equal(stageVars["var2"]))
 		})
+
+		It("Populates the default hostname correctly", func() {
+			basicRequest := getProxyRequest("orders", "GET")
+			accessor := core.RequestAccessor{}
+			httpReq, err := accessor.ProxyEventToHTTPRequest(basicRequest)
+			Expect(err).To(BeNil())
+
+			Expect(core.DefaultServerAddress).To(Equal("https://" + httpReq.Host))
+			Expect(core.DefaultServerAddress).To(Equal("https://" + httpReq.URL.Host))
+		})
+
+		It("Uses a custom hostname", func() {
+			myCustomHost := "http://my-custom-host.com"
+			os.Setenv(core.CustomHostVariable, myCustomHost)
+			basicRequest := getProxyRequest("orders", "GET")
+			accessor := core.RequestAccessor{}
+			httpReq, err := accessor.ProxyEventToHTTPRequest(basicRequest)
+			Expect(err).To(BeNil())
+
+			Expect(myCustomHost).To(Equal("http://" + httpReq.Host))
+			Expect(myCustomHost).To(Equal("http://" + httpReq.URL.Host))
+			os.Unsetenv(core.CustomHostVariable)
+		})
+
+		It("Strips terminating / from hostname", func() {
+			myCustomHost := "http://my-custom-host.com"
+			os.Setenv(core.CustomHostVariable, myCustomHost+"/")
+			basicRequest := getProxyRequest("orders", "GET")
+			accessor := core.RequestAccessor{}
+			httpReq, err := accessor.ProxyEventToHTTPRequest(basicRequest)
+			Expect(err).To(BeNil())
+
+			Expect(myCustomHost).To(Equal("http://" + httpReq.Host))
+			Expect(myCustomHost).To(Equal("http://" + httpReq.URL.Host))
+			os.Unsetenv(core.CustomHostVariable)
+		})
 	})
 })
 

core/types.go

@@ -12,7 +12,7 @@ func GatewayTimeout() events.APIGatewayProxyResponse {
 	return events.APIGatewayProxyResponse{StatusCode: http.StatusGatewayTimeout}
 }
 
-// New Logged Error
+// NewLoggedError generates a new error and logs it to stdout
 func NewLoggedError(format string, a ...interface{}) error {
 	err := fmt.Errorf(format, a...)
 	fmt.Println(err.Error())

gorillamux/adapter_test.go

@@ -2,7 +2,6 @@ package gorillamux_test
 
 import (
 	"fmt"
-	"log"
 	"net/http"
 
 	"github.com/aws/aws-lambda-go/events"
@@ -16,8 +15,6 @@ import (
 var _ = Describe("GorillaMuxAdapter tests", func() {
 	Context("Simple ping request", func() {
 		It("Proxies the event correctly", func() {
-			log.Println("Starting test")
-
 			homeHandler := func(w http.ResponseWriter, req *http.Request) {
 				w.Header().Add("unfortunately-required-header", "")
 				fmt.Fprintf(w, "Home Page")