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UpdateSignature.java
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UpdateSignature.java
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// Copyright 2022 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.
// [START gmail_update_signature]
import com.google.api.client.googleapis.json.GoogleJsonError;
import com.google.api.client.googleapis.json.GoogleJsonResponseException;
import com.google.api.client.http.HttpRequestInitializer;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.gson.GsonFactory;
import com.google.api.services.gmail.Gmail;
import com.google.api.services.gmail.GmailScopes;
import com.google.api.services.gmail.model.ListSendAsResponse;
import com.google.api.services.gmail.model.SendAs;
import com.google.auth.http.HttpCredentialsAdapter;
import com.google.auth.oauth2.GoogleCredentials;
import java.io.IOException;
/* Class to demonstrate the use of Gmail Update Signature API */
public class UpdateSignature {
/**
* Update the gmail signature.
*
* @return the updated signature id , {@code null} otherwise.
* @throws IOException - if service account credentials file not found.
*/
public static String updateGmailSignature() throws IOException {
/* Load pre-authorized user credentials from the environment.
TODO(developer) - See https://developers.google.com/identity for
guides on implementing OAuth2 for your application. */
GoogleCredentials credentials = GoogleCredentials.getApplicationDefault()
.createScoped(GmailScopes.GMAIL_SETTINGS_BASIC);
HttpRequestInitializer requestInitializer = new HttpCredentialsAdapter(credentials);
// Create the gmail API client
Gmail service = new Gmail.Builder(new NetHttpTransport(),
GsonFactory.getDefaultInstance(),
requestInitializer)
.setApplicationName("Gmail samples")
.build();
try {
SendAs primaryAlias = null;
ListSendAsResponse aliases = service.users().settings().sendAs().list("me").execute();
for (SendAs alias : aliases.getSendAs()) {
if (alias.getIsPrimary()) {
primaryAlias = alias;
break;
}
}
// Updating a new signature
SendAs aliasSettings = new SendAs().setSignature("Automated Signature");
SendAs result = service.users().settings().sendAs().patch(
"me",
primaryAlias.getSendAsEmail(),
aliasSettings)
.execute();
//Prints the updated signature
System.out.println("Updated signature - " + result.getSignature());
return result.getSignature();
} catch (GoogleJsonResponseException e) {
// TODO(developer) - handle error appropriately
GoogleJsonError error = e.getDetails();
if (error.getCode() == 403) {
System.err.println("Unable to update signature: " + e.getDetails());
} else {
throw e;
}
}
return null;
}
}
// [END gmail_update_signature]