I am working in the Google Drive API integration to my project during this, I wanted to use Google drive service
as a service to my application because I don't want each user to log in via Google account to retrieve and
upload any file in the cloud storage.
So I started using different approaches provided for Google API (Web application, Stand alone application and As a service account). All these accounts require authentication Via OATH 2.0.
I did some Goggling for the solution and finally found a solution to use service account, by hoping this may help other writing this.
First login to API Console and create a service account.
Once service account is created download private key file and use it for service account authentication.
So I started using different approaches provided for Google API (Web application, Stand alone application and As a service account). All these accounts require authentication Via OATH 2.0.
I did some Goggling for the solution and finally found a solution to use service account, by hoping this may help other writing this.
First login to API Console and create a service account.
Once service account is created download private key file and use it for service account authentication.
Constants
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| private static final String KEY_TYPE = "PKCS12"; | |
| private static final String KEY_ALIAS = "privatekey"; | |
| private static final String KEY_PASSWORD = "notasecret"; | |
| private static final String KEY = "YOUR_PRIVATE_KEY.p12"; | |
| private static final String SERVICE_ACCOUNT_EMAIL = YOUR_SERVICE_ACCOUNT; | |
| private static final List<String> SCOPES = Arrays.asList(YOUR_API_SCOPES); | |
| public static final HttpTransport HTTP_TRANSPORT = new NetHttpTransport(); | |
| public static final JsonFactory JSON_FACTORY = new JacksonFactory(); |
Key Validation
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| Preconditions.checkArgument(!SERVICE_ACCOUNT_EMAIL.startsWith("[["), "Please enter your service account e-mail from the Google APIs Console to the " + | |
| "SERVICE_ACCOUNT_EMAIL constant in %s", GAuthentication.class.getName()); | |
| InputSupplier < InputStream > inputSupplier = new InputSupplier < InputStream > () { | |
| public InputStream getInput() throws IOException { | |
| return GAuthentication.class.getResourceAsStream(KEY); | |
| }; | |
| }; | |
| String p12Content = CharStreams.readFirstLine(CharStreams.newReaderSupplier(inputSupplier, Charset.defaultCharset())); | |
| Preconditions.checkArgument(!p12Content.startsWith("Please"), p12Content) |
Create Google Credential
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| KeyStore keyStore = KeyStore.getInstance(KEY_TYPE); | |
| InputStream keyStream = GAuthentication.class.getResourceAsStream(KEY); | |
| PrivateKey privateKey = PrivateKeys.loadFromKeyStore(keyStore, keyStream, KEY_PASSWORD, KEY_ALIAS, KEY_PASSWORD); | |
| Builder builder = new GoogleCredential.Builder(); | |
| builder.setTransport(HTTP_TRANSPORT); | |
| builder.setJsonFactory(JSON_FACTORY); | |
| builder.setServiceAccountId(SERVICE_ACCOUNT_EMAIL); | |
| builder.setServiceAccountScopes(SCOPES); | |
| builder.setServiceAccountPrivateKey(privateKey); | |
| credential = builder.build(); |
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