B4J Question [SOLVED] Google Oauth2 And Refresh Token

Star-Dust · Mar 14, 2024

When I ask for the token following Erel's example (here) it works correctly and tells me that the token will last 60 minutes. When I refresh nothing changes, it gives me a response that doesn't change the duration and it doesn't give me a refresh token.

Following the instructions of several tutorials I set my application as public (no longer in testing phase) but nothing changed.

Other tutorials say that if it doesn't give you a Refresh Token, you should use the same Token for the refresh....

At the end of all experiments after 60 minutes I always have to authenticate again.

There is a solution?

DonManfred · Mar 18, 2024

Star-Dust said:
it doesn't give me the refresh token back like you see in my logs.

You are not requesting OAuth in OFFLINE-Mode.
Probably that´s the problem.

Using OAuth 2.0 for Web Server Applications | Authorization | Google for Developers

developers.google.com

You´ll only get a Refreshtoken in offline-mode.

I recently had the same problem with my Dropbox-Library.
I had to rewrite the OAuthflow to use offline-mode to get a refreshtoken which i can use to generate a new AccessToken whenever i need to.

Erel · Mar 14, 2024

Star-Dust said:
At the end of all experiments after 60 minutes I always have to authenticate again.

Do you need to do a full authentication with the browser? I'm running services that access Google apis and they run quietly forever.

Star-Dust · Mar 14, 2024

Yes, I have to re-authenticate with the browser. I know you can, unfortunately I can't. I would like to understand why it doesn't give me any refresh-token code

Erel · Mar 14, 2024

Add some logging to this sub:

B4X:

Public Sub GetAccessToken
    If ti.Valid = False Then
        Authenticate
    Else If ti.AccessExpiry < DateTime.Now Then
        GetTokenFromRefresh
    Else
        RaiseEvent(True)
    End If
End Sub

ti.Valid should always be true. If it becomes false then the file was probably deleted, or you called ResetToken.

Star-Dust · Mar 14, 2024

It becomes false without deleting the file and without resetting. After 60 minutes it no longer works. If I call refreshtoken 5 minutes before 60 minutes it returns "expired in 300" i.e. 5 minutes

Erel · Mar 14, 2024

There are two places where ResetToken is called. Debug it and find out where it fails.

Star-Dust · Mar 14, 2024

I've tested them both, I've been studying them for 10 days. If I ask for a refresh before 60 minutes it gives me back the remaining time. If I call after 60 minutes it says the Token is not valid.

However, at the first login it should give me a refresh code in addition to the token, but it doesn't send it, some guides say that you have to use the same token as refresh, but it doesn't work

Star-Dust · Mar 14, 2024

I get this on first login

{
"access_token": "ya29.a0Ad...",
"expires_in": 3599,
"scope": "https://www.googleapis.com/auth/drive",
"token_type": "Bearer"
}

And this at the renewal

{
"access_token": "ya29.a0Ad52N3....",
"expires_in": 288,
"scope": "https://www.googleapis.com/auth/drive",
"token_type": "Bearer"
}

?

Erel · Mar 17, 2024

I still don't understand where it fails.
Change the sub to:

B4X:

Public Sub GetAccessToken
    Log("valid? " & ti.Valid)
    If ti.Valid = False Then
        Authenticate
    Else If ti.AccessExpiry < DateTime.Now Then
        GetTokenFromRefresh
    Else
        RaiseEvent(True)
    End If
End Sub

And post the logs.

Star-Dust · Mar 17, 2024

First connection

{
"access_token": "ya29.a0Ad...",
"expires_in": 3599,
"scope": "https://www.googleapis.com/auth/drive",
"token_type": "Bearer"
}

request renewal after 55 minutes

Getting access token from refresh token...
{
"access_token": "ya29.a0Ad52N3....",
"expires_in": 288,
"scope": "https://www.googleapis.com/auth/drive",
"token_type": "Bearer"
}

request after 60 minutes

Getting access token from refresh token...
ResponseError. Reason: , Response: {
"error": "invalid_grant",
"error_description": "Token has been expired or revoked."
}

Erel · Mar 18, 2024

"error": "invalid_grant",
This is important information.

1. The refresh token never expires. It is the access token that expires and you then use the refresh token to get a new one.
2. Go over the suggestions here: https://stackoverflow.com/questions/10576386/invalid-grant-trying-to-get-oauth-token-from-google

Star-Dust · Mar 18, 2024

it doesn't give me the refresh token back like you see in my logs.

DonManfred · Mar 18, 2024

Star-Dust said:
it doesn't give me the refresh token back like you see in my logs.

You are not requesting OAuth in OFFLINE-Mode.
Probably that´s the problem.

Using OAuth 2.0 for Web Server Applications | Authorization | Google for Developers

developers.google.com

You´ll only get a Refreshtoken in offline-mode.

I recently had the same problem with my Dropbox-Library.
I had to rewrite the OAuthflow to use offline-mode to get a refreshtoken which i can use to generate a new AccessToken whenever i need to.

Star-Dust · Mar 18, 2024

DonManfred said:
You are not requesting OAuth in OFFLINE-Mode.
Probably that´s the problem.

Using OAuth 2.0 for Web Server Applications | Authorization | Google for Developers

developers.google.com

You´ll only get a Refreshtoken in offline-mode.
View attachment 151911

I recently had the same problem with my Dropbox-Library.
I had to rewrite the OAuthflow to use offline-mode to get a refreshtoken which i can use to generate a new AccessToken whenever i need to.

Resolved. That was exactly the problem. Thank you so much

DonManfred · Mar 18, 2024

Star-Dust said:
Resolved.

can you please post the changes you made to the OAuth-Class?

Star-Dust · Mar 18, 2024

B4X:

Private Sub Authenticate
#if B4J
    PrepareServer
#End If
    Dim link As String = BuildLink("https://accounts.google.com/o/oauth2/v2/auth", _
         CreateMap("client_id": mClientId, _
        "redirect_uri": GetRedirectUri, _
        "response_type": "code", "scope": mScope, "access_type":"offline"))
#if B4A
    Dim pi As PhoneIntents
    StartActivity(pi.OpenBrowser(link))
#else if B4i
    Main.App.OpenURL(link)
#else if B4J
    fx.ShowExternalDocument(link)
#end if
End Sub

B4J Question [SOLVED] Google Oauth2 And Refresh Token

Star-Dust

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Using OAuth 2.0 for Web Server Applications | Authorization | Google for Developers

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