B4A Class [class][B4X] Google OAuth2

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GoogleOAuth2 class is compatible with B4A, B4i and B4J (new).

It is no longer possible to use WebView to implement Google's OAuth2 authentication.
The solution is to open the default browser and set the redirection uri in such a way that the browser will redirect the response back to our app.

GoogleOAuth2 class takes care of several tasks:

1. Opening the browser and getting the authorization code.
2. Getting and saving the access token and refresh token from the authorization code.
3. Getting a new access token when it expires using the refresh token.

The process is documented here: https://developers.google.com/identity/protocols/OAuth2InstalledApp

Setup

1. Go to Google developer console, create a new project if needed and add a client id:

SS-2017-05-11_15.14.36.png


For the Android client you need to get the SHA-1 signature. It is available under Tools - Private Sign Key.
Set the package name or bundle identifier fields to your app's package name.

2. B4A:
Add to the manifest editor:
B4X:
AddActivityText(Main,
  <intent-filter>
  <action android:name="android.intent.action.VIEW" />
  <category android:name="android.intent.category.DEFAULT" />
  <category android:name="android.intent.category.BROWSABLE" />
  <data android:scheme="$PACKAGE$" />
  </intent-filter>
   )
B4i:
Change b4i.example2 with your package name.
B4X:
#UrlScheme: b4i.example2

3. B4A code:
B4X:
Sub Activity_Resume
   oauth2.CallFromResume(Activity.GetStartingIntent)
End Sub
B4i code:
B4X:
Sub Application_OpenUrl (Url As String, Data As Object, SourceApplication As String) As Boolean
   oauth2.CallFromOpenUrl(Url)
   Return True
End Sub

B4J:
Create a new OAuth Client id with the type set to Other.
You need to add both the client id and the client secret to the project (client secret is not required in the the mobile solutions).
The Initialize methods expects two additional parameters: client secret and the path where the token will be stored.


3. Initialize GoogleOAuth2 with the required scopes (based on the API that you want to call).
Call GoogleOAuth2.GetAccessToken. The AccessTokenAvailable will be raised when the token is available.
Once you have the access token, you can access the relevant Google web service.
In this example we will access the People API. You need to enable it in Google console.
Example:
B4X:
Sub btnGetData_Click
   oauth2.GetAccessToken
   Wait For OAuth2_AccessTokenAvailable (Success As Boolean, Token As String)
   If Success = False Then
     ToastMessageShow("Error accessing account.", True)
     Return
   End If
   Dim j As HttpJob
   j.Initialize("", Me)
   j.Download2("https://people.googleapis.com/v1/people/me", _
       Array As String("access_token", Token, "requestMask.includeField", "person.email_addresses,person.birthdays,person.names"))
   Wait For (j) JobDone(j As HttpJob)
   If j.Success Then
     ParsePersonData(j.GetString)
   Else
     ToastMessageShow("Online data not available.", True)
   End If
   j.Release
End Sub

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SS-2017-06-20_17.56.27.png


The latest version (v2.10) of GoogleOAuth2 class is attached separately. You should use that version instead of the one included in the zips.
 

Attachments

  • B4i_GoogleOAuth2.zip
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  • B4A_GoogleOAuth2.zip
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  • B4J_GoogleOAuth2.zip
    5.5 KB · Views: 496
  • GoogleOAuth2.bas
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Last edited:

Rusty

Well-Known Member
Licensed User
This works great! Thanks!
Can this be "embedded" into a widget?
Rusty
 
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