Telegram - Integration Gmail Api with Flutter

SaayeedMDaawoud
March 7, 2024
206 views
1 vote
2 Answers

I’m working on a flutter app that has a module which help user to listen to his gmail and notify him if there is a new mail delivered it’s look like this bot on telegram

for example i want list his all message so i went to this api and tring it on postmant

my request as thier guide is

curl --location --request GET 'https://gmail.googleapis.com/gmail/v1/users/me/profile?key=AIzaSyB4Eg2A34XlMp89XEdLA0aJUFAsTPn9B3o' 
--header 'Authorization: Bearer ya29.a0Ad52N395ZScRVeFUSJvAaD8jIQQE3BpdZf4awh-W_XmNc3Gb92N2CPw5Sc3BYz6QrOfPwuqP1YkzMoBxuuYAzkV7vy4MJ2alLiNI3uOfyET9Yiwga7vpVkc81LY5_4FD-ejw83DyOV9janee8EFnKo6JIafbzS6_MeFVXxfTawaCgYKAa4SARESFQHGX2Mi_H5hxg6MtI_NEFJXp91Ngw0177' 
--header 'Content-Type: application/json'

but i get this reponse

{
    "error": {
        "code": 401,
        "message": "Request had invalid authentication credentials. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.",
        "errors": [
            {
                "message": "Invalid Credentials",
                "domain": "global",
                "reason": "authError",
                "location": "Authorization",
                "locationType": "header"
            }
        ],
        "status": "UNAUTHENTICATED"
    }
}

i tried to do Oauth in flutter using

oauth2: ^2.0.2
oauth2_client: ^3.2.2
flutter_appauth: ^6.0.4
googleapis_auth: ^1.5.0
extension_google_sign_in_as_googleapis_auth: ^2.0.12

no one worked for me, always there is something is missing like customUriScheme / redirectUri /discoveryUrl / etc

anyone could help me how to deal with gmail api, please?

Answers

Instead of testing it in Postman, I opted to code directly within the app. Utilizing the google_sign_in package, I obtained the current user’s access credentials/headers and utilized them to authenticate with Google’s API package(googleapis).

Get AuthHeaders Using google_sign_in

await _googleSignIn.signIn();
Map<String, String>? headers = await _googleSignIn.currentUser?.authHeaders;

import 'package:googleapis/gmail/v1.dart' as gMail;

final authHeaders =headers; // usersAuthHeaders
final authenticateClient = GoogleAuthClient(authHeaders);
gmailApi = gMail.GmailApi(authenticateClient);

GoogleAuthClient

import 'package:http/http.dart' as http;

class GoogleAuthClient extends http.BaseClient {
  final Map<String, String> _headers;

  final http.Client _client = http.Client();

  GoogleAuthClient(this._headers);

  @override
  Future<http.StreamedResponse> send(http.BaseRequest request) {
    return _client.send(request..headers.addAll(_headers));
  }

Following this setup, you can proceed to iterate through and retrieve messages:

for (gMail.Message message in results.messages ?? []) {
    // Your code here
}

Result is list of gMail.Message

i’ll share more snippet of my code

Future<void> init() async {
    final authHeaders = headers;
    final authenticateClient = GoogleAuthClient(authHeaders);
    gmailApi = gMail.GmailApi(authenticateClient);

    try {
      gMail.ListMessagesResponse results = await gmailApi.users.messages
          .list('me', q: 'is:inbox');

      for (gMail.Message message in results.messages ?? []) {
        print("Message ID : ${message.id}");

        gMail.Message messageData =
            await gmailApi.users.messages.get("me", message.id ?? "-");

        setState(() {
          messagesList.add(messageData);
        });
      }
    } catch (e) {
      print('Error initializing Gmail API: $e');
      // Handle error gracefully, maybe show an error message to the user.
    }
  }

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Telegram – Integration Gmail Api with Flutter

Answers