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Simple "Hello world" samples for accessing Google Cloud APIs in (node,dotnet,java,golang,python)

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Google Cloud Platform API hello world samples

samples provided as-is without warranty

Sample code demonstrating various Auth mechanism for Google Cloud Platform APIs.

Please refer to official documentation for usage and additional samples/usage.

Google Authentication Samples

Application Default Credentials

The samples use Application Default Credentials which uses credentials in the following order as described in the link. Set the environment variable to override.

You can always specify the target source to acquire credentials by using intent specific targets such as: ComputeCredentials, UserCredentials or ServiceAccountCredential.

There are two types of client libraries you can use to connect to Google APIs:

  • Google Cloud Client Libraries
  • Gooogle API Client Libraries

The basic differences is the Cloud Client libraries are idomatic, has gcloud-based emulators and much eaiser to use.

It is recommended to use Cloud Client Libraries whereever possible. Although this article primarily describes the API Client libraries, the python code section describes uses of Cloud Client libraries with Google Cloud Storage.

For more information, see

This article also describes how to use IAM's serviceAccountActor role to issue access_tokens, id_tokens and JWT. For more information on that, see auth/tokens/.

The following examples use the Oauth2 service to demonstrate the initialized client using Google API Client Libraries. The first section is about the different client libraries you can use.

For more inforamtion, see:

GoogleLibraries

As described in the introduciton, this section details the two types of libraries you can use to access Google Services:

Google Cloud Client Libraries

These libraries are idomatic, easy to use and even support the gcloud-based emulator framework. This is the recommended library set to use to access Google Cloud APIs.

For more information, see:

The following example describes various ways to initialize a service account to list the Google Cloud Storage buckets the account has access to. It also shows listing the buckets using the default account currently initialized by gcloud.

To use the mechanisms here, you need to initialize gcloud's application defaults:

gcloud auth application-default login

Cloud Python

The following uses the google-storage client described here: Storage Client

virtualenv env
source env/bin/activate
pip install google-cloud-storage

The following lists some of the various mechanisms to acquire credentials:

List buckets using the default account on the current gcloud cli (preferred)

from google.cloud import storage

client = storage.Client()
buckets = client.list_buckets()
for bkt in buckets:
  print bkt

List buckts using gcloud cli explicit credential and project

from google.cloud import storage
import google.auth

credentials, project = google.auth.default()    
client = storage.Client(credentials=credentials)
buckets = client.list_buckets()
for bkt in buckets:
  print bkt

List buckets using an environment variable and then google.auth.default() credentials.

from google.cloud import storage
import google.auth
impot os

os.environ["GOOGLE_APPLICATION_CREDENTIALS"] = "YOUR_JSON_CERT.json"
credentials, project = google.auth.default()
if credentials.requires_scopes:
  credentials = credentials.with_scopes(['https://www.googleapis.com/auth/devstorage.read_write'])
client = storage.Client(credentials=credentials)
buckets = client.list_buckets()
for bkt in buckets:
  print bkt

List buckets using a service_account oauth2 object directly

from google.cloud import storage
import google.auth
from google.oauth2 import service_account

credentials = service_account.Credentials.from_service_account_file('YOUR_JSON_CERT.json')
if credentials.requires_scopes:
  credentials = credentials.with_scopes(['https://www.googleapis.com/auth/devstorage.read_write'])

client = storage.Client(credentials=credentials)
buckets = client.list_buckets()
for bkt in buckets:
  print bkt

List buckets using the storage client directly loading the certificate:

from google.cloud import storage

client = storage.Client.from_service_account_json("YOUR_JSON_CERT.json")
buckets = client.list_buckets()
for bkt in buckets:
  print bkt
Iterators

see

  • Logging:
import os
import pprint
from google.cloud import logging

from google.cloud.logging import ASCENDING
from google.cloud.logging import DESCENDING

pp = pprint.PrettyPrinter(indent=1)

FILTER = 'resource.type="gae_app" AND logName="projects/mineral-minutia-820/logs/appengine.googleapis.com%2Frequest_log" AND protoPayload.resource="/"'

client = logging.Client()

iterator = client.list_entries(filter_=FILTER, order_by=DESCENDING)
for page in iterator.pages:
  print('    Page number: %d' % (iterator.page_number,))
  print('  Items in page: %d' % (page.num_items,))
  print('Items remaining: %d' % (page.remaining,))
  print('Next page token: %s' % (iterator.next_page_token,))  
  print('----------------------------')
  for entry in page:
      print(entry.timestamp)
  • Monitoring:
# virtualenv env
# source env/bin/activate
# pip install google-cloud-monitoring==0.30.0

import datetime, time
import pprint
from google.cloud import monitoring_v3
from google.cloud.monitoring_v3.query import Query

client = monitoring_v3.MetricServiceClient()

metric_type = 'serviceruntime.googleapis.com/api/request_count'
resource_type = 'consumed_api'
service = 'logging.googleapis.com'

now = datetime.datetime.utcnow()
fifteen_mins_ago =  now - datetime.timedelta(minutes=15)

q = Query(client, project='YOUR_PROJECT', metric_type=metric_type, minutes=10)
q.select_interval(end_time=now,start_time=fifteen_mins_ago)
q.select_resources(resource_type=resource_type, service=service)

for timeseries in q.iter():
  print '========== Metric: '
  #pprint.pprint(timeseries)
  print '========== Points: '
  for p in timeseries.points:
   print repr(p)
   print str(p.start_time) + ' --> ' + str(p.end_time) + '  : [' +  str(p.value.get('bucketCounts')) + ']'
  print('-----------------')
Using google.auth for GoogleAPIs

The following shows transport authorization for the original Google APIs

import oauth2client
from oauth2client.client import GoogleCredentials
import httplib2

http = httplib2.Http()
credentials = GoogleCredentials.get_application_default()
if credentials.create_scoped_required():
  credentials = credentials.create_scoped(scopes)
http = credentials.authorize(http)

If you need to use the more recent Google Cloud Auth library, you need to cast the transport:

import google.auth
import google_auth_httplib2

scopes = ['https://www.googleapis.com/auth/devstorage.read_write']
credentials, project = google.auth.default(scopes=scopes)
http =  google_auth_httplib2.AuthorizedHttp(credentials)

or preferably init a cloud API:

from google.cloud import storage
import google.auth
from google.oauth2 import service_account
import os

#credentials = service_account.Credentials.from_service_account_file('YOUR_JSON_CERT.json')
#if credentials.requires_scopes:
#  credentials = credentials.with_scopes(['https://www.googleapis.com/auth/devstorage.read_write'])
#client = storage.Client(credentials=credentials)

os.environ["GOOGLE_APPLICATION_CREDENTIALS"] = "/home/srashid/gcp_misc/certs/mineral-minutia-820-83b3ce7dcddb.json"
credentials, project = google.auth.default()    
client = storage.Client(credentials=credentials)
buckets = client.list_buckets()
for bkt in buckets:
  print bkt
Logging_Cloud_python

If you want to enable trace logging with google-cloud-python* library set,

#!/usr/bin/python

from google.cloud import bigquery
from six.moves import http_client

http_client.HTTPConnection.debuglevel = 5

client = bigquery.Client()
query_job = client.query("""
        SELECT timestamp
FROM
 `mineral-minutia-820.gae_request_logs.appengine_googleapis_com_request_log_20161119`
ORDER BY timestamp DESC
LIMIT
 4;""")

results = query_job.result()
for row in results:
        print(row)

Cloud Java

The following describes using java default credentials. You can explictly setCredentials() while initializing a service but that is not recommended as the code is not portable

The various credential types can be found here:

The samples conained within

Shows one sample app that uses both library types. At the time of writing (7/7/18), there is a conflict between the grpc dependencies and google apis.

WHich means, if you use GoogleAPIs, comment out the sections for Cloud API in the pom and .java files:

for Cloud APIs, use:

  • pom.xml
  <dependency>
      <groupId>com.google.cloud</groupId>
      <artifactId>google-cloud-storage</artifactId>
      <version>1.35.0</version>
  </dependency>

  <dependency>
    <groupId>com.google.cloud</groupId>
    <artifactId>google-cloud-pubsub</artifactId>
    <version>1.35.0</version>
  </dependency>
import com.google.cloud.storage.Bucket;
import com.google.cloud.storage.Storage;
import com.google.cloud.storage.StorageOptions;
import com.google.cloud.storage.Blob;
import com.google.cloud.storage.Blob.BlobSourceOption;
import com.google.cloud.storage.BlobId;
import com.google.cloud.storage.BlobInfo;

import com.google.cloud.storage.Storage.SignUrlOption;
import java.util.concurrent.TimeUnit;
import java.net.URL;
import java.util.Iterator;
import java.io.FileInputStream;


//import com.google.auth.oauth2.ServiceAccountCredentials;

// Using Google Cloud APIs with service account file
// You can also just export an export GOOGLE_APPLICATION_CREDENTIALS and use StorageOptions.defaultInstance().service()
// see https://github.com/google/google-auth-library-java#google-auth-library-oauth2-http
/*
Storage storage_service = StorageOptions.newBuilder()
			.setCredentials(ServiceAccountCredentials.fromStream(new FileInputStream("/path/to/your/certificate.json")))
			.build()
			.getService();			
*/

Storage storage_service = StorageOptions.newBuilder()
	.build()
	.getService();
for (Bucket b : storage_service.list().iterateAll()){
  System.out.println(b);
}

// You can also use the client to generate a signed URL:
URL signedUrl = storage_service.signUrl(BlobInfo.newBuilder("your_project", "a.txt").build(), 60,  TimeUnit.SECONDS);
System.out.println(signedUrl);
Proxy Server Settings

see proxy/README.md

export  https_proxy=proxy_server:3128

Credential/Channel Providers

import com.google.auth.oauth2.GoogleCredentials;
import com.google.auth.oauth2.ServiceAccountCredentials;

import com.google.api.gax.core.GoogleCredentialsProvider;
import com.google.api.gax.core.FixedCredentialsProvider;
import com.google.api.gax.grpc.GrpcTransportChannel;
import com.google.api.gax.rpc.TransportChannelProvider;
import com.google.api.gax.rpc.FixedTransportChannelProvider;

import com.google.cloud.pubsub.v1.Publisher;
import com.google.cloud.pubsub.v1.TopicAdminClient;
import com.google.cloud.pubsub.v1.TopicAdminSettings;
import com.google.cloud.pubsub.v1.TopicAdminClient.ListTopicSubscriptionsPagedResponse;
import com.google.cloud.pubsub.v1.TopicAdminClient.ListTopicsPagedResponse;
import com.google.pubsub.v1.ProjectTopicName;
import com.google.pubsub.v1.ListTopicsRequest;
import com.google.pubsub.v1.ProjectName;
import com.google.pubsub.v1.ProjectTopicName;
import com.google.pubsub.v1.Topic;

import io.grpc.ManagedChannel;
import io.grpc.ManagedChannelBuilder;

    // or set ADC
    //export GOOGLE_APPLICATION_CREDENTIALS="/path/to/keyfile.json"
    String cred_env = System.getenv("GOOGLE_APPLICATION_CREDENTIALS");
	GoogleCredentials creds = GoogleCredentials.getApplicationDefault();	  	  
    //String cert_file = "keyfile.json";    
	//GoogleCredentials creds = GoogleCredentials.fromStream(new FileInputStream(cred_env));
	FixedCredentialsProvider credentialsProvider = FixedCredentialsProvider.create(creds);

	///ManagedChannel channel = ManagedChannelBuilder.forTarget("pubsub.googleapis.com:443").build();
    //TransportChannelProvider channelProvider = FixedTransportChannelProvider.create(GrpcTransportChannel.create(channel));

	TransportChannelProvider channelProvider = TopicAdminSettings.defaultTransportChannelProvider();

	TopicAdminClient topicClient =
	  TopicAdminClient.create(
		  TopicAdminSettings.newBuilder()
			  .setTransportChannelProvider(channelProvider)
			  .setCredentialsProvider(credentialsProvider)
			  .build());
Async Futures

see Example

import com.google.iam.v1.GetIamPolicyRequest;
import com.google.iam.v1.Policy;
import com.google.iam.v1.SetIamPolicyRequest;
import com.google.iam.v1.Binding;
import com.google.cloud.Role;

    // setup topicadmin client using the bit above
	TopicAdminClient topicClient =
	  TopicAdminClient.create(
		  TopicAdminSettings.newBuilder()
			  .setTransportChannelProvider(channelProvider)
			  .setCredentialsProvider(credentialsProvider)
              .build());

      String formattedResource = TopicName.create("mineral-minutia-820", "saltopic2").toString();

      GetIamPolicyRequest request = GetIamPolicyRequest.newBuilder()
        .setResource(formattedResource)
        .build();
      ApiFuture<Policy> future = topicAdminClient.getIamPolicyCallable().futureCall(request);
      Policy response = future.get();
      System.out.println(response);

Cloud Go

Package cloud.google.com/go/storage

The following shows google.DefaultTokenSource as well as gcloud's Application Default Credentials

import (
        "golang.org/x/net/context"
        "cloud.google.com/go/storage"
        "google.golang.org/api/iterator"
        "google.golang.org/api/option"
        "log"  
)

	ctx := context.Background()
	/*
		tokenSource, err := google.DefaultTokenSource(oauth2.NoContext, storage.ScopeReadOnly)
		if err != nil {
			log.Fatalf("Unable to acquire token source: %v", err)
		}
		storeageClient, err := storage.NewClient(ctx, option.WithTokenSource(tokenSource))
	*/

	storeageClient, err := storage.NewClient(ctx)
	if err != nil {
		log.Fatalf("Unable to acquire storage Client: %v", err)
	}

	it := storeageClient.Buckets(ctx, "your_project")
	for {
		bucketAttrs, err := it.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			log.Fatalf("Unable to acquire storage Client: %v", err)
		}
		log.Printf(bucketAttrs.Name)
	}
Adding custom headers
package main


import (
  "context"
  "io/ioutil"
  "log"
  "net/http"

  "cloud.google.com/go/storage"
  "google.golang.org/api/option"
  raw "google.golang.org/api/storage/v1"
  htransport "google.golang.org/api/transport/http"
)

func main() {

  ctx := context.Background()

  // Standard way to initialize client:
  // client, err := storage.NewClient(ctx)
  // if err != nil {
  //      // handle error
  // }

  // Instead, create a custom http.Client.
  base := http.DefaultTransport
  trans, err := htransport.NewTransport(ctx, base, option.WithScopes(raw.DevstorageFullControlScope),
            option.WithUserAgent("custom-user-agent"))
  if err != nil {
            // Handle error.
  }
  c := http.Client{Transport:trans}

  // Add RoundTripper to the created HTTP client.
  c.Transport = withDebugHeader{c.Transport}

  // Supply this client to storage.NewClient
  client, err := storage.NewClient(ctx, option.WithHTTPClient(&c))
  if err != nil {
              // Handle error.
  }

  // Use client...
 }

type withDebugHeader struct {
  rt http.RoundTripper
}

func (wdh withDebugHeader) RoundTrip(r *http.Request) (*http.Response, error) {
  headerName := "X-Custom-Header"
  r.Header.Add(headerName, "value")
  resp, err := wdh.rt.RoundTrip(r)
  if err == nil {
    log.Printf("Resp Header: %+v, ", resp.Header.Get(headerName))
  } else {
    log.Printf("Error: %+v", err)
  }
  return resp, err
}
Exponential Backoff

Cloud libraries implement backoff automatically per service.

Cloud Node

The google-cloud node package initalizes the Cloud API library set:

The sample under auth/compute/nodeapp shows both Cloud APIs and Google APIs

const Storage = require('@google-cloud/storage');
const storage = new Storage({
    projectId: 'your-project',
  });

storage.getBuckets(function(err, buckets) {
  if (!err) {
  	buckets.forEach(function(value){
  			logger.info(value.id);
	});
  }
});

const Pubsub = require('@google-cloud/pubsub');
const pubsub = Pubsub({
    projectId: 'your-project'
  });
  pubsub.getTopics((err, topic) => {
      if (err) {
          logger.error(err);
          return;
      }
      topic.forEach(function(entry) {
      logger.info(entry.name);
      });
  });

Cloud C#

Use Google.Cloud.Storage.V1 package for Google Cloud API access

See auth/service/dotnet for sample for both Cloud APIs and Google APIs libraries.

using Google.Cloud.Storage.V1;

namespace CloudStorageAppGcloud
{
    class Program
    {
        static void Main(string[] args)
        {
            var client = StorageClient.Create();

            foreach (var obj in client.ListObjects("your_project", ""))
            {
                Console.WriteLine(obj.Name);
            }
            Console.ReadLine();
        }
    }
}

gRPC Environment Variables

JWT Access Token

JWT access tokens are efficient way to access certain google apis without the extra round trip to get an access_token. Unlike the normal Oauth service account flow where you

  1. use a local service account to sign a JWT,
  2. Exchange that JWT with google to get an access_token
  3. Use that access_token to make an API call to google

with JWT Access Tokens, all you do is sign a JWT locally with a service account with the intended Service you want to access and then simply send it to the service.

The following links describes this flow:

where these Google APIs will support this:

eg. for PubSub

	// https://github.com/googleapis/googleapis/blob/master/google/pubsub/pubsub.yaml#L6

	ctx := context.Background()
	projectID := "YOUR_PROJECT"
	keyfile := "service_account.json"

	audience := "https://pubsub.googleapis.com/google.pubsub.v1.Publisher"

	keyBytes, err := ioutil.ReadFile(keyfile)
	if err != nil {
		log.Fatalf("Unable to read service account key file  %v", err)
	}
	tokenSource, err := google.JWTAccessTokenSourceFromJSON(keyBytes, audience)
	if err != nil {
		log.Fatalf("Error building JWT access token source: %v", err)
	}
	jwt, err := tokenSource.Token()
	if err != nil {
		log.Fatalf("Unable to generate JWT token: %v", err)
	}
	fmt.Println(jwt.AccessToken)

	pubsubClient, err := pubsub.NewClient(ctx, projectID, option.WithTokenSource(tokenSource))
	if err != nil {
		log.Fatalf("Could not create pubsub Client: %v", err)
	}

Google API Client Library for Python

The following describes the older, non-idomatic libraries. As you can see, its much easier using the idomatic library set.

virtualenv env
source env/bin/activate
pip install --upgrade requests google-api-python-client httplib2 oauth2client


import os
import httplib2
from apiclient.discovery import build
from oauth2client.service_account import ServiceAccountCredentials
from oauth2client.client import GoogleCredentials

scope='https://www.googleapis.com/auth/devstorage.read_only'

#os.environ["GOOGLE_APPLICATION_CREDENTIALS"] = "YOUR_JSON_CERT.json"
credentials = GoogleCredentials.get_application_default()
if credentials.create_scoped_required():
  credentials = credentials.create_scoped(scope)
http = httplib2.Http()
credentials.authorize(http)

service = build(serviceName='storage', version= 'v1',http=http)
resp = service.buckets().list(project='YOUR_PROJECT').execute()
for i in resp['items']:
  print i['name']

You can also initialize an AuthorizedHttp artifact from google-auth library with discovery:

# http://google-auth.readthedocs.io/en/latest/reference/google.auth.html
# https://github.com/GoogleCloudPlatform/google-auth-library-python-httplib2
import google.auth
import google_auth_httplib2
credentials, project = google.auth.default(scopes=scopes)
http =  google_auth_httplib2.AuthorizedHttp(credentials)

service = build(serviceName='cloudtasks',
  discoveryServiceUrl='https://cloudtasks.googleapis.com/%24discovery/rest?version=v2beta2',
  version= 'v2beta2',http=http)

Google API Python

apt-get install curl python2.7 python-pip
pip install requests google-api-python-client httplib2 oauth2client

Appengine

Under auth/gae/pyapp/ Deploys an application to appengine that uses Application Default Credentials.

AppAssertionCredentials is also shown but commented.

Remember to edit app.yaml file with your appID.

If running on the dev_appserver, you will need to set the local service account id and certificate first:

cd auth/gae/pyapp

virtualenv env
source env/bin/activate
pip install -t lib  -r requirements.txt
deactvate && rm -rf env

# To run with your own gcloud credentials
dev_appserver.py app.yaml

# For service account credentials
cat your_svc_account.p12 | openssl pkcs12 -nodes -nocerts -passin pass:notasecret | openssl rsa > key.pem
dev_appserver.py app.yaml --appidentity-email-address=YOUR_SERVICE_ACCOUNT_ID@developer.gserviceaccount.com --appidentity-private-key-path=key.pem

For info on --appidentity-email-address and --appidentity-private-key-path, see documentation on gcloud dev_appserver.

ComputeEngine

Under auth/compute/pyapp Runs a simple application on compute engine using Application Default Credentials.

AppAssertionCredentials is also shown but commented

or

cd auth/compute/pyapp
virtualenv env
source env/bin/activate
pip install -r requirements.txt

python compute.py

Service Account File

Under auth/service/pyapp Runs a simple application that uses the service account credential from both a PKCS12 file and a JSON keyfile. Application Default Credentials uses the JSON keyfile only if the GOOGLE_APPLICATION_CREDENTIALS variable isset

For more details, goto Service Accounts

Userflow

Under auth/userflow/pyapp Runs a simple application that performs user-interactive webflow and propmpts the user for consent. Download an installed app client_secrets.json and reference it for the 'flow_from_clientsecrets()' method.

For more deails, goto flow_from_clientsecrets

The sample also shows the simplified flow with a browser listener (so that you dont' have to type in the code manually):

from google_auth_oauthlib.flow import InstalledAppFlow
flow = InstalledAppFlow.from_client_secrets_file(
    'client_secrets.json',
    scopes=['profile', 'email'])

flow.run_local_server()

client = photos_v1.PhotoServiceClient(credentials=flow.credentials)

Misc

Setting API Key

Example showing how to set the API_KEY.

service = build(serviceName='oauth2', version= 'v2',http=http, developerKey='YOUR_API_KEY')
Logging

Enable verbose wire tracing.

import logging
import httplib2
import sys

logFormatter = logging.Formatter('%(asctime)s - %(name)s - %(message)s')
root = logging.getLogger()
root.setLevel(logging.INFO)           
ch = logging.StreamHandler(sys.stdout)
ch.setLevel(logging.INFO)    
ch.setFormatter(logFormatter)
root.addHandler(ch)
logging.getLogger('oauth2client.client').setLevel(logging.DEBUG)
logging.getLogger('apiclient.discovery').setLevel(logging.DEBUG)

httplib2.debuglevel=3
Appengine Cloud Endpoints Framework

Sample discovery for Appengine Cloud Enpoints.

Note: this is for use with Endpoints Framework running on GAE python27 and java7 (not OpenAPI)

service = build(serviceName='myendpoint', discoveryServiceUrl='https://yourappid.appspot.com/_ah/api/discovery/v1/apis/yourendpoint/v1/rest',version= 'v1',http=http)
resource = service.yourAPI()
resp = resource.get(parameter='value').execute()
Credential store

See credential store documentation.

ID Token from Service Account JSON Signed by Google

If you need an id_token issued by Google using your JSON certificate:

THe old way was to run through the full flow manually:

from oauth2client.service_account import ServiceAccountCredentials
credentials = ServiceAccountCredentials.from_json_keyfile_name('YOUR_SERVICE_AcCOUNT.json')
now = int(time.time())
payload = {
        'iat': now,
        'exp': now + credentials.MAX_TOKEN_LIFETIME_SECS,
        'aud': 'https://www.googleapis.com/oauth2/v4/token',
        'iss': 'svc1-001@YOUR_PROJECT.iam.gserviceaccount.com',
        'scope': 'svc1-001@YOUR_PROJECT.iam.gserviceaccount.com'
}
signed_jwt = oauth2client.crypt.make_signed_jwt(credentials._signer, payload, key_id=credentials._private_key_id)
params = urllib.urlencode({
      'grant_type': 'urn:ietf:params:oauth:grant-type:jwt-bearer',
      'assertion': signed_jwt })
headers = {"Content-Type": "application/x-www-form-urlencoded"}
conn = httplib.HTTPSConnection("www.googleapis.com")
conn.request("POST", "/oauth2/v4/token", params, headers)
res = json.loads(conn.getresponse().read())
print res

The new (preferred) way is to use the new ```iamcredentials`` API directly. See id_tokens/README.md

both which Returns JSON with a JWT signed by Google:

{"id_token": "YOUR_ID_TOKEN_SIGNED_BY_GOOGLE"}

Decoded JWT id_token:

{
  "iss": "https://accounts.google.com",
  "aud": "svc1-001@YOUR_PROJECT.iam.gserviceaccount.com",
  "sub": "111402810199779215722",
  "email_verified": true,
  "azp": "svc1-001@YOUR_PROJECT.iam.gserviceaccount.com",
  "email": "svc1-001@YOUR_PROJECT.iam.gserviceaccount.com",
  "iat": 1468897846,
  "exp": 1468901446
}

If you are running the flow directly, if you used 'scope': 'https://www.googleapis.com/auth/userinfo.email', the return fields would include an access_token scoped to userinfo.email for the service account.

Google API Java

Java API Client Library. Most of the samples below uses gradle to build and deploy.

Appengine

Under auth/gae/javaapp. Runs a simple application using both Application DefaultCredentials and AppIdentityService. To deploy, edit the build.gradle file and enter the username of an administrator on the GAE application.

Sample shows both Cloud Client and Google API library set

mvn appengine:run
mvn appengine:deploy

ComputeEngine

Under auth/compute/javaapp. Runs a simple application using both Application DefaultCredentials and ComputeCredential.

mvn exec:java

Service Account File

Under auth/service/javaapp. Runs a simple application using both Application DefaultCredentials and by directly reading in the JSON certificate file. If the GOOGLE_APPLICATION_CREDENTIALS variable is set to point to the JSON file, the applicationDefault profile will also read the JSON file (otherwise, it will attempt to pick up the gcloud credentials)

mvn exec:java

UserFlow

Under auth/userflow/javaapp. Runs a simple webflow application to acquire user consent for GoogleAPIs. This particular userflow launches a browser and listener.

mvn exec:java

Misc

Logging
import java.util.logging.ConsoleHandler;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.logging.SimpleFormatter;

ConsoleHandler consoleHandler = new ConsoleHandler();
consoleHandler.setLevel(Level.ALL);
consoleHandler.setFormatter(new SimpleFormatter());

Logger logger = Logger.getLogger("com.google.api.client");
logger.setLevel(Level.ALL);
logger.addHandler(consoleHandler);  

Logger lh = Logger.getLogger("httpclient.wire.header");
lh.setLevel(Level.ALL);
lh.addHandler(consoleHandler);

Logger lc = Logger.getLogger("httpclient.wire.content");
lc.setLevel(Level.ALL);
lc.addHandler(consoleHandler);

Logger gl = Logger.getLogger("io.grpc");
gl.setLevel(Level.FINE);
gl.addHandler(consoleHandler);
Setting API Key
String API_KEY = "...";
Oauth2 service = new Oauth2.Builder(httpTransport, jsonFactory, credential)
    .setApplicationName("oauth client")
    .setOauth2RequestInitializer(new Oauth2RequestInitializer(API_KEY))    
    .build();
Setting Request Parameter
Oauth2 service = new Oauth2.Builder(httpTransport, jsonFactory, credential)
    .setApplicationName("oauth client")
    .setOauth2RequestInitializer(new Oauth2RequestInitializer(){
        @Override
        public void initializeOauth2Request(Oauth2Request<?> request) {
            request.setPrettyPrint(true);
        }
    })      
    .build();
Credential store

See documentatin on Drive

Exponential Backoff

See ExponentialBackOff

Usign GoogleAPIs:

import com.google.api.client.util.ExponentialBackOff;

final GoogleCredential credential = GoogleCredential.getApplicationDefault(httpTransport,jsonFactory).createScoped(Arrays.asList(Oauth2Scopes.USERINFO_EMAIL));

Oauth2 service = new Oauth2.Builder(httpTransport, jsonFactory, new HttpRequestInitializer() {
                public void initialize(HttpRequest request) throws IOException {
                    request.setContentLoggingLimit(0);
                    request.setCurlLoggingEnabled(false);
                    credential.initialize(request);
                    ExponentialBackOff backoff = new ExponentialBackOff.Builder()
                    .setInitialIntervalMillis(500)
                    .setMaxElapsedTimeMillis(900000)
                    .setMaxIntervalMillis(6000)
                    .setMultiplier(1.5)
                    .setRandomizationFactor(0.5)
                    .build();
                  request.setUnsuccessfulResponseHandler(new HttpBackOffUnsuccessfulResponseHandler(backoff));
                }
            })                  
            .setApplicationName("oauth client")
            .build();

or using Cloud Libraries

import com.google.api.gax.retrying.RetrySettings;

        Storage storage = StorageOptions.newBuilder()
            .setCredentials(myprovider.getCredentials())
            .setRetrySettings(ServiceOptions.getDefaultRetrySettings())
            .build()
            .getService();

Google API Go

DefaultTokenSource

Appengine

Under auth/gae/goapp. Runs a simple GAE application using both Application DefaultCredentials and AppEngineTokenSource. To deploy:

Note: for use with Appengine Standard:

mkdir extra
export GOPATH=`pwd`/extra

go get golang.org/x/oauth2
go get google.golang.org/appengine/...
go get google.golang.org/cloud/compute/...
go get google.golang.org/api/oauth2/v2
go get cloud.google.com/go/compute/metadata


run locally:
  dev_appserver.py src/app.yaml

deploy:
  gcloud app deploy deploy src/app.yaml

ComputeEngine

Under auth/compute/goapp. Runs a simple application using both Application DefaultCredentials and ComputeTokenSource. To deploy:

Make sure you create a GCE instance with the userinfo.email scope. That will allow the token to be used against the oauth2 endpoint

export GOPATH=`pwd`

go get golang.org/x/oauth2
go get google.golang.org/cloud/compute/...
go get google.golang.org/api/oauth2/v2
go get cloud.google.com/go/compute/metadata


go run src/main.go

Service Account JSON File

Under auth/service/goapp. Runs a simple application using both Application DefaultCredentials and directly reading JWTConfigFromJSON.

The sample also demonstrates both google api clients and google cloud client libraries.

To use:

edit serviceAccountJSONFile := "YOUR_SERVICE_ACCOUNT_JSON_FILE" and set the path to your service account JSON file. After that, you can either explictly use the credential type for service account (JWTConfigFromJSON, or set the environment variable ause ADC)

THis sample also uses the service account to iterate over the Cloud Storage buckets. Make sure the service account has that permissoin

export GOPATH=`pwd`

go get golang.org/x/oauth2
go get google.golang.org/cloud/compute/...
go get google.golang.org/api/oauth2/v2
go get cloud.google.com/go/compute/metadata
go get github.com/googleapis/gax-go
go get o.opencensus.io/trace
go get go.opencensus.io/plugin/ochttp
go get go.opencensus.io/exporter/stackdriver/propagation
go get google.golang.org/grpc

go run src/main.go

UserFlow

Under auth/userflow/goapp. Runs a simple webflow application to acquire user consent for GoogleAPIs. This particular userflow launches a link URL and expects the authorization token to get entered (installed application).

To use, go to the cloud console, "API & Credentials > Credentials", then "Create Credentials > Oauth2 Credentials > Other". Copy the clientID and secret into main.go:

        ClientID:     "YOUR_CLIENT_ID",
        ClientSecret: "YOUR_CLIENT_SECRET",

go get golang.org/x/net/context
go get golang.org/x/oauth2/google
go get google.golang.org/cloud/compute/...
go get google.golang.org/api/oauth2/v2

go run src/main.go

You will see a URL. Copy that URL to a browser, login and then enter the code. This sample runs the "installed application" flow

Misc

Setting API Key
import "google.golang.org/api/googleapi/transport"
apiKey :="YOUR_API_KEY"
client.Transport = &transport.APIKey{
    Key: apiKey,
}
ID Token Signed by Google

The following only works with your local (user) gcloud credentials.

Also see

import (
	"log"

	"golang.org/x/net/context"
	"golang.org/x/oauth2"
	"golang.org/x/oauth2/google"
	oauthsvc "google.golang.org/api/oauth2/v2"

	"google.golang.org/grpc/credentials/oauth"
)

func main() {

	src, err := google.DefaultTokenSource(oauth2.NoContext, oauthsvc.UserinfoEmailScope)
	if err != nil {
		log.Fatalf("Unable to acquire token source: %v", err)
	}

	creds := oauth.TokenSource{src}
	tok, err := creds.Token()
	if err != nil {
		log.Fatalf("Unable to acquire token source: %v", err)
	}
	if (tok.Extra("id_token") != nil){
		log.Printf("id_token: " , tok.Extra("id_token").(string))
	}
}

Validating id_token

src, err := google.DefaultTokenSource(oauth2.NoContext, oauthsvc.UserinfoEmailScope)
if err != nil {
    log.Fatalf("Unable to acquire token source: %v", err)
}
tok, err := src.Token()
if err != nil {
    log.Fatalf("Unable to acquire token: %v", err)
}
log.Printf("id_token: " , tok.Extra("id_token").(string))

Also see

Credential store

See oauth2.ReuseTokenSource

src, err := google.DefaultTokenSource(oauth2.NoContext, oauthsvc.UserinfoEmailScope)
if err != nil {
   log.Fatalf("Unable to acquire token source: %v", err)
}

tok, err := tokenFromFile("credential.token")
src = oauth2.ReuseTokenSource(tok,src)
tokenval, err := src2.Token()
if err != nil {
    log.Fatalf("Token can't be read")
} else {
    log.Printf("token %v\n", tokenval.AccessToken)
}

client := oauth2.NewClient(context.Background(), src)
svc, err := oauthsvc.New(client)
if err != nil {
    log.Fatalf("ERROR: ", err)
}
...
...
func saveToken(file string, token *oauth2.Token) {
    f, err := os.Create(file)
    if err != nil {
        log.Printf("Warning: failed to cache oauth token: %v", err)
        return
    }
    defer f.Close()
    json.NewEncoder(f).Encode(token)
}

func tokenFromFile(file string) (*oauth2.Token, error) {
    f, err := os.Open(file)
    if err != nil {
        return nil, err
    }
    defer f.Close()
    t := new(oauth2.Token)
    err = json.NewDecoder(f).Decode(t)
    return t, err
}
Logging

The follwoing example of trace http logging wraps the Transport around a logging version: LogTransport.

This example also shows how the API_KEY could get constructed although this particular API (oauth2/v2) does not need or expect an api_key.

package main
import (
    "golang.org/x/oauth2"
    "golang.org/x/oauth2/google"    
    "log"   
    oauthsvc "google.golang.org/api/oauth2/v2"
    "google.golang.org/api/googleapi/transport"
    "net/http"
)
const (
    api_key   = "YOUR_API_KEY"
)
func Auth() {
    src, err := google.DefaultTokenSource(oauth2.NoContext, oauthsvc.UserinfoEmailScope)
    if err != nil {
        log.Fatalf("Unable to acquire token source: %v", err)
    }
    transport := &transport.APIKey{
    //  Key:       api_key,
        Transport: &logTransport{http.DefaultTransport},
    }
    client := &http.Client{
        Transport: &oauth2.Transport{
            Source: src,
            Base:   transport,
        },
    }           
    service, err := oauthsvc.New(client)
    if err != nil {
        log.Fatalf("Unable to create oauth2 service client: %v", err)
    }
    ui, err := service.Userinfo.Get().Do()
    if err != nil {
        log.Fatalf("ERROR: ", err)
    }   
    log.Printf("UserInfo: %v", ui.Email)
}

Google API NodeJS

google.auth.getApplicationDefault

Appengine

Under auth/gae/nodeapp. Runs a simple GAE application using Application DefaultCredentials. To deploy:

gcloud app deploy app.yaml

ComputeEngine

Runs sample on ComputeEngine. Requires the userinfo scope enabled on the compute engine instance.

npm install
npm start

Service Account JSON File

Under auth/service/nodeapp. Runs a simple application using both Application DefaultCredentials and directly reading JSON KEY file.

UserFlow

Under auth/userflow/nodeapp. Runs a simple webflow application to acquire user consent for GoogleAPIs. This particular userflow provides a link URL and expects the authorization token to get entered (installed application).

Misc

Setting API Key
var service = google.oauth2({
      version: 'v2',
      auth: authClient,
      params: { key: 'YOUR_API_KEY'}
});
Logging
export NODE_DEBUG=request

Google API C#

.NET packages downloadable from NuGet. Full end-to-end example of all the auth modes available here for CloudStorage

The following code snippet demonstrates both google apis and google cloud libraries all in one auth/compute/dotnet:

cd auth/compute/dotnet
dotnet restore
dotnet run

Appengine

GAE Standard does not support .NET as a runtime. However, you can deploy your application to GAE Flex if you run .NET Core on Linux. See the following sample that runs a .NET webapp in Flex: .NET on GCP. Note: Google APIs do not support .NET Core (coreCLR) yet. At the time of writing, they only supports upto .NET Framework 4.5.1. This means you cannot use Google APIs from within a Container. There are some ports to coreCLR but they are not officially supported.

ComputeEngine

Under auth/compute/dotnet. Runs a simple application using both Application DefaultCredentials and ComputeCredential.

dotnet restore
dotnet run

Service Account JSON File

Under auth/service/dotnet. Runs a simple application using both Application DefaultCredentials using a JSON Certificate and by directly reading in the PKCS12 Certificate file. If the GOOGLE_APPLICATION_CREDENTIALS variable is set to point to the JSON file, the applicationDefault profile will also read the JSON file (otherwise, it will attempt to pick up the gcloud credentials).

Edit service/dotnet/ServiceAuth.cs file and set the path to the service account key file. Then,

dotnet restore
dotnet run

UserFlow

Under auth/userflow/dotnet. Runs a simple webflow application to acquire user consent for GoogleAPIs. This particular userflow launches provides a link URL and expects user consent on the browser.

Credential store

Credentials from the GoogleAPIs userflow is usually stored at

Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData));
or c:\Users\%USER%\AppData\Roaming\Google.Apis.Auth

Using API through Proxy

gRPC clients support http_proxy parameter:

See proxy folder for detailed usage.

to use:

docker run  -p 3128:3128 -ti docker.io/salrashid123/squidproxy /bin/bash

then when inside the container:
/apps/squid/sbin/squid -NsY -f /apps/squid.conf.transparent &

tail -f /apps/squid/var/logs/access.log

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Simple "Hello world" samples for accessing Google Cloud APIs in (node,dotnet,java,golang,python)

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