Google Chat'ten gelen istekleri doğrulama

Konsol

İşlevinizi Google Cloud'a dağıttıktan sonra:

1. Google Cloud Console'da Cloud Functions sayfasına gidin:

   Cloud Functions'a git

2. Cloud Functions listesinde, alma işlevinin yanındaki onay kutusunu tıklayın. (İşlevi tıklamayın.)

3. Ekranın üst kısmındaki İzinler'i tıklayın. İzinler paneli açılır.

4. Ana hesap ekle'yi tıklayın.

5. Yeni ana hesaplar alanına chat@system.gserviceaccount.com yazın.

6. Rol seçin açılır menüsünden Cloud Functions > Cloud Functions Çağırıcısı rolünü seçin.

7. Kaydet'i tıklayın.

gcloud

gcloud functions add-iam-policy-binding komutunu kullanın:

gcloud functions add-iam-policy-binding RECEIVING_FUNCTION \
  --member='serviceAccount:chat@system.gserviceaccount.com' \
  --role='roles/cloudfunctions.invoker'

RECEIVING_FUNCTION değerini Chat uygulamanızın işlevinin adıyla değiştirin.

Konsol

İşlevinizi veya hizmetinizi Google Cloud'a dağıttıktan sonra:

1. Google Cloud Console'da Cloud Run sayfasına gidin:

   Cloud Run'a git

2. Cloud Run hizmetleri listesinde, alma işlevinin yanındaki onay kutusunu tıklayın. (İşlevi tıklamayın.)

3. Ekranın üst kısmındaki İzinler'i tıklayın. İzinler paneli açılır.

4. Ana hesap ekle'yi tıklayın.

5. Yeni ana hesaplar alanına chat@system.gserviceaccount.com yazın.

6. Rol seçin açılır menüsünden Cloud Run > Cloud Run Çağırıcısı rolünü seçin.

7. Kaydet'i tıklayın.

gcloud

gcloud functions add-invoker-policy-binding komutunu kullanın:

gcloud functions add-invoker-policy-binding RECEIVING_FUNCTION \
  --member='serviceAccount:chat@system.gserviceaccount.com'

RECEIVING_FUNCTION değerini Chat uygulamanızın işlevinin adıyla değiştirin.

Java

import java.io.IOException;
import java.security.GeneralSecurityException;
import java.util.Collections;

import com.google.api.client.googleapis.auth.oauth2.GoogleIdToken;
import com.google.api.client.googleapis.auth.oauth2.GoogleIdTokenVerifier;
import com.google.api.client.googleapis.auth.oauth2.GooglePublicKeysManager;
import com.google.api.client.http.apache.ApacheHttpTransport;
import com.google.api.client.json.gson.GsonFactory;
import com.google.api.client.json.JsonFactory;

/** Tool for verifying JWT Tokens for Apps in Google Chat. */
public class JWTVerify {
  // Bearer Tokens received by apps will always specify this issuer.
  static String CHAT_ISSUER = "chat@system.gserviceaccount.com";

  // Intended audience of the token, which is the URL of the app.
  static String AUDIENCE = "https://example.com/app/";

  // Get this value from the request's Authorization HTTPS header.
  // For example, for "Authorization: Bearer AbCdEf123456" use "AbCdEf123456".
  static String BEARER_TOKEN = "AbCdEf123456";

  public static void main(String[] args) throws GeneralSecurityException, IOException {
    JsonFactory factory = new GsonFactory();

    GoogleIdTokenVerifier verifier =
        new GoogleIdTokenVerifier.Builder(new ApacheHttpTransport(), factory)
        .setAudience(Collections.singletonList(AUDIENCE))
        .build();

    GoogleIdToken idToken = GoogleIdToken.parse(factory, BEARER_TOKEN);
    if (idToken == null) {
      System.out.println("Token cannot be parsed");
      System.exit(-1);
    }

    // Verify valid token, signed by CHAT_ISSUER, intended for a third party.
    if (!verifier.verify(idToken)
        || !idToken.getPayload().getEmailVerified()
        || !idToken.getPayload().getEmail().equals(CHAT_ISSUER)) {
      System.out.println("Invalid token");
      System.exit(-1);
    }

    // Token originates from Google and is targeted to a specific client.
    System.out.println("The token is valid");
  }
}

Python

import sys
from google.oauth2 import id_token
from google.auth.transport import requests

# Bearer Tokens received by apps will always specify this issuer.
CHAT_ISSUER = 'chat@system.gserviceaccount.com'

# Intended audience of the token, which is the URL of the app.
AUDIENCE = 'https://example.com/app/'

# Get this value from the request's Authorization HTTPS header.
# For example, for 'Authorization: Bearer AbCdEf123456' use 'AbCdEf123456'.
BEARER_TOKEN = 'AbCdEf123456'

try:
  # Verify valid token, signed by CHAT_ISSUER, intended for a third party.
  request = requests.Request()
  token = id_token.verify_oauth2_token(BEARER_TOKEN, request, AUDIENCE)

  if token['email'] != CHAT_ISSUER:
    sys.exit('Invalid token')
except:
  sys.exit('Invalid token')

# Token originates from Google and is targeted to a specific client.
print('The token is valid')

Node.js

import {OAuth2Client} from 'google-auth-library';

// Bearer Tokens received by apps will always specify this issuer.
const CHAT_ISSUER = 'chat@system.gserviceaccount.com';

// Intended audience of the token, which is the URL of the app.
const AUDIENCE = 'https://example.com/app/';

// Get this value from the request's Authorization HTTPS header.
// For example, for "Authorization: Bearer AbCdEf123456" use "AbCdEf123456"
const BEARER_TOKEN = 'AbCdEf123456';

const client = new OAuth2Client();

async function verify() {
  // Verify valid token, signed by CHAT_ISSUER, intended for a third party.
  try {
    const ticket = await client.verifyIdToken({
      idToken: BEARER_TOKEN,
      audience: AUDIENCE
    });
    if (!ticket.getPayload().email_verified
        || ticket.getPayload().email !== CHAT_ISSUER) {
      throw new Error('Invalid issuer');
    }
  } catch (unused) {
    console.error('Invalid token');
    process.exit(1);
  }

  // Token originates from Google and is targeted to a specific client.
  console.log('The token is valid');
}

verify();

Java

import java.io.IOException;
import java.security.GeneralSecurityException;
import java.util.Collections;

import com.google.api.client.googleapis.auth.oauth2.GoogleIdToken;
import com.google.api.client.googleapis.auth.oauth2.GoogleIdTokenVerifier;
import com.google.api.client.googleapis.auth.oauth2.GooglePublicKeysManager;
import com.google.api.client.http.apache.ApacheHttpTransport;
import com.google.api.client.json.gson.GsonFactory;
import com.google.api.client.json.JsonFactory;

/** Tool for verifying JWT Tokens for Apps in Google Chat. */
public class JWTVerify {
  // Bearer Tokens received by apps will always specify this issuer.
  static String CHAT_ISSUER = "chat@system.gserviceaccount.com";

  // Url to obtain the public certificate for the issuer.
  static String PUBLIC_CERT_URL_PREFIX =
      "https://www.googleapis.com/service_accounts/v1/metadata/x509/";

  // Intended audience of the token, which is the project number of the app.
  static String AUDIENCE = "1234567890";

  // Get this value from the request's Authorization HTTPS header.
  // For example, for "Authorization: Bearer AbCdEf123456" use "AbCdEf123456".
  static String BEARER_TOKEN = "AbCdEf123456";

  public static void main(String[] args) throws GeneralSecurityException, IOException {
    JsonFactory factory = new GsonFactory();

    GooglePublicKeysManager.Builder keyManagerBuilder =
        new GooglePublicKeysManager.Builder(new ApacheHttpTransport(), factory);

    String certUrl = PUBLIC_CERT_URL_PREFIX + CHAT_ISSUER;
    keyManagerBuilder.setPublicCertsEncodedUrl(certUrl);

    GoogleIdTokenVerifier.Builder verifierBuilder =
        new GoogleIdTokenVerifier.Builder(keyManagerBuilder.build());
    verifierBuilder.setIssuer(CHAT_ISSUER);
    GoogleIdTokenVerifier verifier = verifierBuilder.build();

    GoogleIdToken idToken = GoogleIdToken.parse(factory, BEARER_TOKEN);
    if (idToken == null) {
      System.out.println("Token cannot be parsed");
      System.exit(-1);
    }

    // Verify valid token, signed by CHAT_ISSUER, intended for a third party.
    if (!verifier.verify(idToken)
        || !idToken.verifyAudience(Collections.singletonList(AUDIENCE))
        || !idToken.verifyIssuer(CHAT_ISSUER)) {
      System.out.println("Invalid token");
      System.exit(-1);
    }

    // Token originates from Google and is targeted to a specific client.
    System.out.println("The token is valid");
  }
}

Python

import sys

from google.oauth2 import id_token
from google.auth.transport import requests

# Bearer Tokens received by apps will always specify this issuer.
CHAT_ISSUER = 'chat@system.gserviceaccount.com'

# Url to obtain the public certificate for the issuer.
PUBLIC_CERT_URL_PREFIX = 'https://www.googleapis.com/service_accounts/v1/metadata/x509/'

# Intended audience of the token, which will be the project number of the app.
AUDIENCE = '1234567890'

# Get this value from the request's Authorization HTTPS header.
# For example, for 'Authorization: Bearer AbCdEf123456' use 'AbCdEf123456'.
BEARER_TOKEN = 'AbCdEf123456'

try:
  # Verify valid token, signed by CHAT_ISSUER, intended for a third party.
  request = requests.Request()
  certs_url = PUBLIC_CERT_URL_PREFIX + CHAT_ISSUER
  token = id_token.verify_token(BEARER_TOKEN, request, AUDIENCE, certs_url)

  if token['iss'] != CHAT_ISSUER:
    sys.exit('Invalid issuer')
except:
  sys.exit('Invalid token')

# Token originates from Google and is targeted to a specific client.
print('The token is valid')

Node.js

import fetch from 'node-fetch';
import {OAuth2Client} from 'google-auth-library';

// Bearer Tokens received by apps will always specify this issuer.
const CHAT_ISSUER = 'chat@system.gserviceaccount.com';

// Url to obtain the public certificate for the issuer.
const PUBLIC_CERT_URL_PREFIX =
    'https://www.googleapis.com/service_accounts/v1/metadata/x509/';

// Intended audience of the token, which is the project number of the app.
const AUDIENCE = '1234567890';

// Get this value from the request's Authorization HTTPS header.
// For example, for "Authorization: Bearer AbCdEf123456" use "AbCdEf123456"
const BEARER_TOKEN = 'AbCdEf123456';

const client = new OAuth2Client();

/** Verifies JWT Tokens for Apps in Google Chat. */
async function verify() {
  // Verify valid token, signed by CHAT_ISSUER, intended for a third party.
  try {
    const response = await fetch(PUBLIC_CERT_URL_PREFIX + CHAT_ISSUER);
    const certs = await response.json();
    const ticket = await client.verifySignedJwtWithCertsAsync(
        BEARER_TOKEN, certs, AUDIENCE, [CHAT_ISSUER]);
  } catch (unused) {
    console.error('Invalid token');
    process.exit(1);
  }

  // Token originates from Google and is targeted to a specific client.
  console.log('The token is valid');
}

verify();