I'm currently facing a 400 error when calling Gmail API.
I have enabled Gmail API in my Google Cloud console (it is G Suite account, not personal account).
And i have created a service account, then try to use postman to test out the Gmail API.
I'm using my service account to exchange a Bearer Token
I have requested all the possible scopes.
[https://www.googleapis.com/auth/gmail.addons.current.message.readonly, https://www.googleapis.com/auth/gmail.addons.current.action.compose, https://www.googleapis.com/auth/gmail.settings.basic, https://www.googleapis.com/auth/gmail.labels, https://www.googleapis.com/auth/gmail.settings.sharing, https://www.googleapis.com/auth/gmail.addons.current.message.metadata, https://www.googleapis.com/auth/gmail.readonly, https://www.googleapis.com/auth/gmail.send, https://www.googleapis.com/auth/gmail.addons.current.message.action, https://www.googleapis.com/auth/gmail.compose, https://www.googleapis.com/auth/gmail.insert, https://www.googleapis.com/auth/gmail.metadata, https://mail.google.com/, https://www.googleapis.com/auth/gmail.modify]
And then I use the token to access the following endpoint.
GET https://gmail.googleapis.com/gmail/v1/users/me/messages
It gives me the following error. I have been googling for a few days but i have no luck.
{
"error": {
"code": 400,
"message": "Precondition check failed.",
"errors": [
{
"message": "Precondition check failed.",
"domain": "global",
"reason": "failedPrecondition"
}
],
"status": "FAILED_PRECONDITION"
}
}
This is the my code:
public static void main(String[] args) {
try {
NetHttpTransport httpTransport = GoogleNetHttpTransport.newTrustedTransport();
GoogleCredentials credentials = ServiceAccountCredentials
.fromStream(new FileInputStream("/home/rl/.gsutil/prive-production-appDev.json"));
credentials = credentials.createScoped(GmailScopes.all());
System.out.println(credentials.getAuthenticationType());
Properties props = new Properties();
Session session = Session.getDefaultInstance(props, null);
MimeMessage email = new MimeMessage(session);
email.setFrom(new InternetAddress("xxxx"));
email.addRecipient(javax.mail.Message.RecipientType.TO,
new InternetAddress("xxxx"));
email.setSubject("test");
email.setText("test");
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
email.writeTo(buffer);
String encodedEmail = Base64.encodeBase64URLSafeString(buffer.toByteArray());
com.google.api.services.gmail.model.Message message = new com.google.api.services.gmail.model.Message();
message.setRaw(encodedEmail);
HttpRequestInitializer requestInitializer = new HttpCredentialsAdapter(credentials);
Gmail gmail = new Gmail.Builder(httpTransport, JacksonFactory.getDefaultInstance(), requestInitializer)
.setApplicationName("Prive Technologies")
.build();
ListMessagesResponse res = gmail.users().messages().list("me").execute();
message = gmail.users().messages().send("me", message).execute();
} catch (IOException | MessagingException | GeneralSecurityException e) {
e.printStackTrace();
}
}
I'm using this :
