feat(cloudrun): add sample for service-to-service auth (#5291)

* feat(cloudrun): start service-to-service auth sample

* fix(cloudrun): start with receiveAuthorizeRequest endpoint

* fix(cloudrun): start with receiveAuthorizeRequest endpoint

* feat(cloudrun): add sample for auth service-to-service

* feat(cloudrun): add sample for auth service-to-service

* fix(cloudrun): run go mod tidy

* fix(cloudrun): remove unnecesary jumpline

* fix(cloudrun): update http response status

* fix(cloudrun): run go mod tidy

* fix(cloudrun): add retry block in test

* fix(cloudrun): fix pr issues

* fix(cloudrun): add region tag and move handler to main

* fix(cloudrun): update get identity token

* fix(cloudrun): modify auth token function

* fix(cloudrun): modify auth token function

* fix(cloudrun): modify auth token function

* fix(cloudrun): add comments to newApp function

* fix(cloudrun): add complementary comments

* fix(cloudrun): reduce function getServiceURL

* fix(cloudrun): make region a const

* fix(cloudrun): remove old change

* fix(cloudrun): fix deployed service error

* fix(cloudrun): add region tags

* fix(cloudrun): add region tags

---------

Co-authored-by: Eric Schmidt <[email protected]>

Author: OremGLG

go.work

@@ -128,6 +128,7 @@ use (
 	./run/markdown-preview/editor
 	./run/markdown-preview/renderer
 	./run/pubsub
+	./run/service-auth
 	./run/sigterm-handler
 	./run/system_package
 	./run/testing

run/service-auth/go.mod

@@ -0,0 +1,58 @@
+module github.com/GoogleCloudPlatform/golang-samples/run/service-auth
+
+go 1.23.0
+
+require (
+	github.com/GoogleCloudPlatform/golang-samples v0.0.0-20250414185348-49adefec1b88
+	github.com/google/uuid v1.6.0
+	google.golang.org/api v0.233.0
+)
+
+require (
+	cel.dev/expr v0.20.0 // indirect
+	cloud.google.com/go v0.120.0 // indirect
+	cloud.google.com/go/auth v0.16.1 // indirect
+	cloud.google.com/go/auth/oauth2adapt v0.2.8 // indirect
+	cloud.google.com/go/compute/metadata v0.6.0 // indirect
+	cloud.google.com/go/iam v1.5.0 // indirect
+	cloud.google.com/go/monitoring v1.24.0 // indirect
+	cloud.google.com/go/storage v1.50.0 // indirect
+	github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.26.0 // indirect
+	github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/metric v0.50.0 // indirect
+	github.com/GoogleCloudPlatform/opentelemetry-operations-go/internal/resourcemapping v0.50.0 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/cncf/xds/go v0.0.0-20250121191232-2f005788dc42 // indirect
+	github.com/envoyproxy/go-control-plane/envoy v1.32.4 // indirect
+	github.com/envoyproxy/protoc-gen-validate v1.2.1 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/go-jose/go-jose/v4 v4.0.4 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/google/s2a-go v0.1.9 // indirect
+	github.com/googleapis/enterprise-certificate-proxy v0.3.6 // indirect
+	github.com/googleapis/gax-go/v2 v2.14.1 // indirect
+	github.com/planetscale/vtprotobuf v0.6.1-0.20240319094008-0393e58bdf10 // indirect
+	github.com/spiffe/go-spiffe/v2 v2.5.0 // indirect
+	github.com/zeebo/errs v1.4.0 // indirect
+	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
+	go.opentelemetry.io/contrib/detectors/gcp v1.34.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.60.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.60.0 // indirect
+	go.opentelemetry.io/otel v1.35.0 // indirect
+	go.opentelemetry.io/otel/metric v1.35.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.35.0 // indirect
+	go.opentelemetry.io/otel/sdk/metric v1.35.0 // indirect
+	go.opentelemetry.io/otel/trace v1.35.0 // indirect
+	golang.org/x/crypto v0.38.0 // indirect
+	golang.org/x/net v0.40.0 // indirect
+	golang.org/x/oauth2 v0.30.0 // indirect
+	golang.org/x/sync v0.14.0 // indirect
+	golang.org/x/sys v0.33.0 // indirect
+	golang.org/x/text v0.25.0 // indirect
+	golang.org/x/time v0.11.0 // indirect
+	google.golang.org/genproto v0.0.0-20250303144028-a0af3efb3deb // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20250414145226-207652e42e2e // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20250505200425-f936aa4a68b2 // indirect
+	google.golang.org/grpc v1.72.0 // indirect
+	google.golang.org/protobuf v1.36.6 // indirect
+)

run/service-auth/go.sum

@@ -0,0 +1,127 @@
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+cloud.google.com/go v0.120.0 h1:wc6bgG9DHyKqF5/vQvX1CiZrtHnxJjBlKUyF9nP6meA=
+cloud.google.com/go v0.120.0/go.mod h1:/beW32s8/pGRuj4IILWQNd4uuebeT4dkOhKmkfit64Q=
+cloud.google.com/go/auth v0.16.1 h1:XrXauHMd30LhQYVRHLGvJiYeczweKQXZxsTbV9TiguU=
+cloud.google.com/go/auth v0.16.1/go.mod h1:1howDHJ5IETh/LwYs3ZxvlkXF48aSqqJUM+5o02dNOI=
+cloud.google.com/go/auth/oauth2adapt v0.2.8 h1:keo8NaayQZ6wimpNSmW5OPc283g65QNIiLpZnkHRbnc=
+cloud.google.com/go/auth/oauth2adapt v0.2.8/go.mod h1:XQ9y31RkqZCcwJWNSx2Xvric3RrU88hAYYbjDWYDL+c=
+cloud.google.com/go/compute/metadata v0.6.0 h1:A6hENjEsCDtC1k8byVsgwvVcioamEHvZ4j01OwKxG9I=
+cloud.google.com/go/compute/metadata v0.6.0/go.mod h1:FjyFAW1MW0C203CEOMDTu3Dk1FlqW3Rga40jzHL4hfg=
+cloud.google.com/go/iam v1.5.0 h1:QlLcVMhbLGOjRcGe6VTGGTyQib8dRLK2B/kYNV0+2xs=
+cloud.google.com/go/iam v1.5.0/go.mod h1:U+DOtKQltF/LxPEtcDLoobcsZMilSRwR7mgNL7knOpo=
+cloud.google.com/go/logging v1.13.0 h1:7j0HgAp0B94o1YRDqiqm26w4q1rDMH7XNRU34lJXHYc=
+cloud.google.com/go/logging v1.13.0/go.mod h1:36CoKh6KA/M0PbhPKMq6/qety2DCAErbhXT62TuXALA=
+cloud.google.com/go/longrunning v0.6.6 h1:XJNDo5MUfMM05xK3ewpbSdmt7R2Zw+aQEMbdQR65Rbw=
+cloud.google.com/go/longrunning v0.6.6/go.mod h1:hyeGJUrPHcx0u2Uu1UFSoYZLn4lkMrccJig0t4FI7yw=
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run/service-auth/main.go

@@ -0,0 +1,88 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+// [START auth_validate_and_decode_bearer_token_on_go]
+import (
+	"context"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+
+	"google.golang.org/api/idtoken"
+	"google.golang.org/api/option"
+)
+
+type app struct {
+	// serviceURI will be used as the audience value for validating tokens.
+	serviceURI string
+}
+
+// newApp returns an app with the serviceURI attribute assigned.
+func newApp() (app, error) {
+	a := app{}
+
+	// Get the service URL from the environment variable
+	// set at the time of deployment.
+	a.serviceURI = os.Getenv("SERVICE_URL")
+
+	return a, nil
+}
+
+// validateToken is used to validate the provided idToken with a known
+// Google cert URL.
+func (a *app) validateToken(token string) (*idtoken.Payload, int, error) {
+	ctx := context.Background()
+
+	// Verify and decode the JWT
+	validator, err := idtoken.NewValidator(ctx, option.WithHTTPClient(http.DefaultClient))
+	if err != nil {
+		return nil, http.StatusInternalServerError, fmt.Errorf("unable to create Validator")
+	}
+
+	// Validate token using serviceURI as audience.
+	payload, err := validator.Validate(ctx, token, a.serviceURI)
+	if err != nil {
+		return nil, http.StatusUnauthorized, fmt.Errorf("invalid token: %v", err)
+	}
+
+	return payload, http.StatusOK, nil
+}
+
+func main() {
+	a, err := newApp()
+	if err != nil {
+		log.Fatalf("newApp error: %v", err)
+	}
+
+	log.Print("starting server...")
+	http.HandleFunc("/", a.receiveAuthorizedRequest)
+
+	// Determine port for HTTP service.
+	port := os.Getenv("PORT")
+	if port == "" {
+		port = "8080"
+		log.Printf("defaulting to port %s", port)
+	}
+
+	// Start HTTP server.
+	log.Printf("listening on port %s", port)
+	if err := http.ListenAndServe(":"+port, nil); err != nil {
+		log.Fatal(err)
+	}
+}
+
+// [END auth_validate_and_decode_bearer_token_on_go]

run/service-auth/receive.go

@@ -0,0 +1,62 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+// [START auth_validate_and_decode_bearer_token_on_go]
+import (
+	"fmt"
+	"net/http"
+	"strings"
+)
+
+// Parse the authorization header and decode the information beign
+// sent by the Bearer Token
+func (a *app) receiveAuthorizedRequest(w http.ResponseWriter, r *http.Request) {
+	// Allows requests only for the root path ("/") to prevent duplicate calls.
+	if r.URL.Path != "/" {
+		http.NotFound(w, r)
+		return
+	}
+
+	// Request method should be GET.
+	if r.Method != http.MethodGet {
+		http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
+		return
+	}
+
+	// Attempt to retrieve and validate the Authorization header.
+	authHeader := r.Header.Get("Authorization")
+	if authHeader == "" {
+		w.Write([]byte("Hello, anonymous user\n"))
+		return
+	}
+
+	if len(strings.Split(authHeader, " ")) != 2 {
+		http.Error(w, "Malformed Authorization header", http.StatusBadRequest)
+		w.WriteHeader(http.StatusUnauthorized)
+		return
+	}
+
+	token := strings.Split(authHeader, " ")[1]
+
+	payload, status, err := a.validateToken(token)
+	if err != nil {
+		http.Error(w, err.Error(), status)
+	}
+
+	w.Write(fmt.Appendf(nil, "Hello, %s!\n", payload.Claims["email"]))
+}
+
+// [END auth_validate_and_decode_bearer_token_on_go]