To integrate Google Drive with Salesforce, you can use the Google Drive REST API along with Apex code in Salesforce. Here's an example of Apex code that demonstrates how to authenticate with Google Drive and perform basic operations like listing files and uploading a file:
Step 1: Set Up the Integration:
1. Create a new Connected App in Salesforce:
- Go to Setup.
- Search for "App Manager" and click on it.
- Click on "New Connected App" and fill in the required details.
- Enable OAuth settings and specify a callback URL.
2. Obtain the Google Drive API credentials:
- Go to the Google API Console (https://console.developers.google.com/).
- Create a new project or select an existing one.
- Enable the Google Drive API.
- Create API credentials (OAuth 2.0 Client ID).
- Make sure to set the correct redirect URI (callback URL).
Step 2: Apex Code Integration:
public class GoogleDriveIntegration {
// Google Drive API Endpoint URLs
private static final String AUTH_ENDPOINT = 'https://accounts.google.com/o/oauth2/auth';
private static final String TOKEN_ENDPOINT = 'https://accounts.google.com/o/oauth2/token';
private static final String DRIVE_API_ENDPOINT = 'https://www.googleapis.com/drive/v3';
// Google Drive API Client ID and Secret
private static final String CLIENT_ID = '<YOUR_CLIENT_ID>';
private static final String CLIENT_SECRET = '<YOUR_CLIENT_SECRET>';
private static final String REDIRECT_URI = '<YOUR_REDIRECT_URI>';
// Google Drive API Scopes
private static final String[] SCOPES = new String[]{'https://www.googleapis.com/auth/drive'};
// Access Token variables
private static String accessToken;
private static String refreshToken;
// Authenticate with Google Drive
public static void authenticate() {
String authUrl = AUTH_ENDPOINT + '?response_type=code' +
'&client_id=' + EncodingUtil.urlEncode(CLIENT_ID, 'UTF-8') +
'&redirect_uri=' + EncodingUtil.urlEncode(REDIRECT_URI, 'UTF-8') +
'&scope=' + EncodingUtil.urlEncode(String.join(' ', SCOPES), 'UTF-8');
// Redirect the user to the Google Drive authorization page
PageReference authPage = new PageReference(authUrl);
authPage.setRedirect(true);
}
// Callback method to retrieve the access token
public static void getToken(String code) {
Http http = new Http();
HttpRequest request = new HttpRequest();
request.setEndpoint(TOKEN_ENDPOINT);
request.setMethod('POST');
request.setHeader('Content-Type', 'application/x-www-form-urlencoded');
String requestBody = 'code=' + EncodingUtil.urlEncode(code, 'UTF-8') +
'&client_id=' + EncodingUtil.urlEncode(CLIENT_ID, 'UTF-8') +
'&client_secret=' + EncodingUtil.urlEncode(CLIENT_SECRET, 'UTF-8') +
'&redirect_uri=' + EncodingUtil.urlEncode(REDIRECT_URI, 'UTF-8') +
'&grant_type=authorization_code';
request.setBody(requestBody);
HttpResponse response = http.send(request);
if (response.getStatusCode() == 200) {
Map<String, Object> responseMap = (Map<String, Object>) JSON.deserializeUntyped(response.getBody());
accessToken = (String) responseMap.get('access_token');
refreshToken = (String) responseMap.get('refresh_token');
}
}
// Method to list files in Google Drive
public static void listFiles() {
Http http = new Http();
HttpRequest request = new HttpRequest();
request.setEndpoint(DRIVE_API
_ENDPOINT + '/files');
request.setMethod('GET');
request.setHeader('Authorization', 'Bearer ' + accessToken);
HttpResponse response = http.send(request);
if (response.getStatusCode() == 200) {
// Process the response to get the list of files
// ...
}
}
// Method to upload a file to Google Drive
public static void uploadFile(String fileName, Blob fileContent) {
Http http = new Http();
HttpRequest request = new HttpRequest();
request.setEndpoint(DRIVE_API_ENDPOINT + '/files?uploadType=multipart');
request.setMethod('POST');
request.setHeader('Authorization', 'Bearer ' + accessToken);
request.setHeader('Content-Type', 'multipart/related; boundary=boundary');
// Construct the multipart request body
String requestBody = '--boundary\r\n' +
'Content-Type: application/json; charset=UTF-8\r\n\r\n' +
'{"name":"' + fileName + '"}\r\n\r\n' +
'--boundary\r\n' +
'Content-Type: application/octet-stream\r\n\r\n';
String requestBodyEnd = '\r\n\r\n--boundary--';
request.setBodyAsBlob(Blob.valueOf(requestBody) + fileContent + Blob.valueOf(requestBodyEnd));
HttpResponse response = http.send(request);
if (response.getStatusCode() == 200) {
// File upload successful
}
}
}
Step 3: Use the Google Drive Integration:
To use the Google Drive integration, you need to call the methods from the `GoogleDriveIntegration` class. For example:
// Step 1: Redirect the user to the Google Drive authorization page
GoogleDriveIntegration.authenticate();
// Step 2: Implement the callback method to retrieve the access token
String authorizationCode = '<Authorization_Code_from_Google_Drive_Redirect>';
GoogleDriveIntegration.getToken(authorizationCode);
// Step 3: List files in Google Drive
GoogleDriveIntegration.listFiles();
// Step 4: Upload a file to Google Drive
String fileName = 'MyFile.txt';
Blob fileContent = Blob.valueOf('This is the content of my file.');
GoogleDriveIntegration.uploadFile(fileName, fileContent);
Remember to replace <YOUR_CLIENT_ID>,<YOUR_CLIENT_SECRET>, and <YOUR_REDIRECT_URI> with your actual Google Drive API credentials and redirect URI.
Note: This example covers basic operations, and you may need to handle additional scenarios like handling access token expiration and handling file download operations. Refer to the Google Drive API documentation (https://developers.google.com/drive) for more details on available API endpoints and features.