Infer domain name from request context (awslabs#67)

* Update github.com/aws/aws-lambda-go?!

* Infer serverAddress from RequestContext.DomainName

* Update CustomHostVariable docs

* Remove redundant DefaultServerAddress

* Update vendor.json

* Update github.com/aws/aws-lambda-go

* Dont expect https protocol in host

core/request.go

@@ -21,13 +21,10 @@ import (
 
 // 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
+// reverts to `RequestContext.DomainName`. 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"
-
 // APIGwContextHeader is the custom header key used to store the
 // API Gateway context. To access the Context properties use the
 // GetAPIGatewayContext method of the RequestAccessor object.
@@ -149,7 +146,7 @@ func (r *RequestAccessor) EventToRequest(req events.APIGatewayProxyRequest) (*ht
 	if !strings.HasPrefix(path, "/") {
 		path = "/" + path
 	}
-	serverAddress := DefaultServerAddress
+	serverAddress := "https://" + req.RequestContext.DomainName
 	if customAddress, ok := os.LookupEnv(CustomHostVariable); ok {
 		serverAddress = customAddress
 	}

core/request_test.go

@@ -287,12 +287,13 @@ var _ = Describe("RequestAccessor tests", func() {
 		It("Populates the default hostname correctly", func() {
 
 			basicRequest := getProxyRequest("orders", "GET")
+			basicRequest.RequestContext = getRequestContext()
 			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))
+			Expect(basicRequest.RequestContext.DomainName).To(Equal(httpReq.Host))
+			Expect(basicRequest.RequestContext.DomainName).To(Equal(httpReq.URL.Host))
 		})
 
 		It("Uses a custom hostname", func() {
@@ -336,6 +337,7 @@ func getRequestContext() events.APIGatewayProxyRequestContext {
 		RequestID: "x",
 		APIID:     "x",
 		Stage:     "prod",
+		DomainName: "12abcdefgh.execute-api.us-east-2.amazonaws.com",
 	}
 }
 

go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/BurntSushi/toml v0.3.1 // indirect
 	github.com/Joker/jade v1.0.0 // indirect
 	github.com/Shopify/goreferrer v0.0.0-20181106222321-ec9c9a553398 // indirect
-	github.com/aws/aws-lambda-go v0.0.0-20190129190457-dcf76fe64fb6
+	github.com/aws/aws-lambda-go v1.17.0
 	github.com/aymerick/raymond v2.0.2+incompatible // indirect
 	github.com/dchest/safefile v0.0.0-20151022103144-855e8d98f185 // indirect
 	github.com/eknkc/amber v0.0.0-20171010120322-cdade1c07385 // indirect
@@ -42,7 +42,6 @@ require (
 	github.com/pkg/errors v0.8.1 // indirect
 	github.com/ryanuber/columnize v2.1.0+incompatible // indirect
 	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
-	github.com/stretchr/testify v1.3.0 // indirect
 	github.com/ugorji/go v0.0.0-20180129160544-d2b24cf3d3b4
 	github.com/urfave/negroni v0.0.0-20180130044549-22c5532ea862
 	github.com/valyala/fasttemplate v1.0.1 // indirect

go.sum

@@ -9,8 +9,11 @@ github.com/Shopify/goreferrer v0.0.0-20181106222321-ec9c9a553398 h1:WDC6ySpJzbxG
 github.com/Shopify/goreferrer v0.0.0-20181106222321-ec9c9a553398/go.mod h1:a1uqRtAwp2Xwc6WNPJEufxJ7fx3npB4UV/JOLmbu5I0=
 github.com/aws/aws-lambda-go v0.0.0-20190129190457-dcf76fe64fb6 h1:YV5tCBu1MJG2XMDkSvDohTQkZZpc2IeZMXuUFCPwE80=
 github.com/aws/aws-lambda-go v0.0.0-20190129190457-dcf76fe64fb6/go.mod h1:zUsUQhAUjYzR8AuduJPCfhBuKWUaDbQiPOG+ouzmE1A=
+github.com/aws/aws-lambda-go v1.17.0 h1:Ogihmi8BnpmCNktKAGpNwSiILNNING1MiosnKUfU8m0=
+github.com/aws/aws-lambda-go v1.17.0/go.mod h1:FEwgPLE6+8wcGBTe5cJN3JWurd1Ztm9zN4jsXsjzKKw=
 github.com/aymerick/raymond v2.0.2+incompatible h1:VEp3GpgdAnv9B2GFyTvqgcKvY+mfKMjPOA3SbKLtnU0=
 github.com/aymerick/raymond v2.0.2+incompatible/go.mod h1:osfaiScAUVup+UC9Nfq76eWqDhXlp+4UYaA8uhTBO6g=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dchest/safefile v0.0.0-20151022103144-855e8d98f185 h1:3T8ZyTDp5QxTx3NU48JVb2u+75xc040fofcBaN+6jPA=
 github.com/dchest/safefile v0.0.0-20151022103144-855e8d98f185/go.mod h1:cFRxtTwTOJkz2x3rQUNCYKWC93yP1VKjR8NUhqFxZNU=
@@ -84,14 +87,17 @@ github.com/onsi/gomega v1.3.0/go.mod h1:C1qb7wdrVGGVU+Z6iS04AVkA3Q65CEZX59MT0QO5
 github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/ryanuber/columnize v2.1.0+incompatible h1:j1Wcmh8OrK4Q7GXY+V7SVSY8nUWQxHW5TkBe7YUl+2s=
 github.com/ryanuber/columnize v2.1.0+incompatible/go.mod h1:sm1tb6uqfes/u+d4ooFouqFdy9/2g9QGwK3SQygK0Ts=
 github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
 github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/ugorji/go v0.0.0-20180129160544-d2b24cf3d3b4 h1:euf5tLM++W5h5uyfs6NSMoCGGhw+hRXMLE/DU6hireM=
 github.com/ugorji/go v0.0.0-20180129160544-d2b24cf3d3b4/go.mod h1:hnLbHMwcvSihnDhEfx2/BzKp2xb0Y+ErdfYcrs9tkJQ=
+github.com/urfave/cli/v2 v2.1.1/go.mod h1:SE9GqnLQmjVa0iPEY0f1w3ygNIYcIJ0OKPMoW2caLfQ=
 github.com/urfave/negroni v0.0.0-20180130044549-22c5532ea862 h1:eg5xqGZGatsyRpVnFJkdeUWSFk46lDgkXLvOryv5ySg=
 github.com/urfave/negroni v0.0.0-20180130044549-22c5532ea862/go.mod h1:Meg73S6kFm/4PpbYdq35yYWoCZ9mS/YSx+lKnmiohz4=
 github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6KllzawFIhcdPw=

vendor/vendor.json

@@ -3,13 +3,13 @@
 	"ignore": "test",
 	"package": [
 		{
-			"checksumSHA1": "60T22joBzjxNa8yKzW0V4egimZI=",
+			"checksumSHA1": "7udeaLOJs0KkZCqN02ndEtOk/+s=",
 			"path": "github.com/aws/aws-lambda-go/events",
-			"revision": "dcf76fe64fb68bc66dd3522c904ccf5ff1b2710a",
-			"revisionTime": "2019-01-29T19:04:57Z"
+			"revision": "26aa36445a99488623e4b21c0e5c0b4dc684eff9",
+			"revisionTime": "2020-05-30T01:27:16Z"
 		},
 		{
-			"checksumSHA1": "trfV9u2UzDAypLfWLdFApLNWj0k=",
+			"checksumSHA1": "SXH3An37BX9zsZA/WmH3MjDqhB4=",
 			"path": "github.com/aws/aws-lambda-go/lambda",
 			"revision": "dcf76fe64fb68bc66dd3522c904ccf5ff1b2710a",
 			"revisionTime": "2019-01-29T19:04:57Z"