// Copyright 2024 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

//

// http://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 chat_quickstart]

import com.google.api.client.auth.oauth2.Credential;

import com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp;

import com.google.api.client.extensions.jetty.auth.oauth2.LocalServerReceiver;

import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;

import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets;

import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;

import com.google.api.client.json.JsonFactory;

import com.google.api.client.json.gson.GsonFactory;

import com.google.api.client.util.store.FileDataStoreFactory;

import com.google.api.gax.core.FixedCredentialsProvider;

import com.google.auth.Credentials;

import com.google.auth.oauth2.AccessToken;

import com.google.auth.oauth2.UserCredentials;

import com.google.chat.v1.ChatServiceClient;

import com.google.chat.v1.ChatServiceSettings;

import com.google.chat.v1.ListSpacesRequest;

import com.google.chat.v1.Space;

import com.google.protobuf.util.JsonFormat;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.util.Collections;

import java.util.Date;

import java.util.List;

/* class to demonstrate use of Google Chat API spaces list API */

public class ChatQuickstart {

/** Directory to store authorization tokens for this application. */

private static final String TOKENS_DIRECTORY_PATH = "tokens";

/**

* Global instance of the scopes required by this quickstart. If modifying these scopes, delete

* your previously saved tokens/ folder.

*/

private static final List<String> SCOPES =

Collections.singletonList("https://www.googleapis.com/auth/chat.spaces.readonly");

/** Global instance of the JSON factory. */

private static final JsonFactory JSON_FACTORY = GsonFactory.getDefaultInstance();

private static final String CREDENTIALS_FILE_PATH = "/credentials.json";

/**

* Run the OAuth2 flow for local/installed app.

*

* @return An authorized Credential object.

* @throws IOException If the credentials.json file cannot be found.

*/

private static Credentials getCredentials() throws Exception {

// Load client secrets.

InputStream credentialsFileInputStream =

ChatQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH);

if (credentialsFileInputStream == null) {

throw new FileNotFoundException("Credentials file resource not found.");

}

GoogleClientSecrets clientSecrets =

GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(credentialsFileInputStream));

// Set up authorization code flow.

GoogleAuthorizationCodeFlow flow =

new GoogleAuthorizationCodeFlow.Builder(

GoogleNetHttpTransport.newTrustedTransport(), JSON_FACTORY, clientSecrets, SCOPES)

// Set these two options to generate refresh token alongside access token.

.setDataStoreFactory(new FileDataStoreFactory(new File(TOKENS_DIRECTORY_PATH)))

.setAccessType("offline")

.build();

// Authorize.

Credential credential =

new AuthorizationCodeInstalledApp(flow, new LocalServerReceiver()).authorize("user");

// Build and return an authorized Credential object

AccessToken accessToken =

new AccessToken(

credential.getAccessToken(),

new Date(

// put the actual expiry date of access token here

System.currentTimeMillis()));

return UserCredentials.newBuilder()

.setAccessToken(accessToken)

.setRefreshToken(credential.getRefreshToken())

.setClientId(clientSecrets.getInstalled().getClientId())

.setClientSecret(clientSecrets.getInstalled().getClientSecret())

.build();

}

public static void main(String... args) throws Exception {

// Override default service settings to supply user credentials.

Credentials credentials = getCredentials();

// Create the ChatServiceSettings with the credentials

ChatServiceSettings chatServiceSettings =

ChatServiceSettings.newBuilder()

.setCredentialsProvider(FixedCredentialsProvider.create(credentials))

.build();

try (ChatServiceClient chatServiceClient = ChatServiceClient.create(chatServiceSettings)) {

ListSpacesRequest request =

ListSpacesRequest.newBuilder()

// Filter spaces by space type (SPACE or GROUP_CHAT or

// DIRECT_MESSAGE).

.setFilter("spaceType = \"SPACE\"")

.build();

// Iterate over results and resolve additional pages automatically.

for (Space response : chatServiceClient.listSpaces(request).iterateAll()) {

System.out.println(JsonFormat.printer().print(response));

}

}

}

}

// [END chat_quickstart]