PowerBuilder

Google OAuth2 Access Token

See more OAuth2 Examples

Demonstrates how to get a Google OAuth2 access token from a desktop application or script. PowerBuilder

integer li_rc
integer li_Success
oleobject loo_Oauth2
string ls_Url
integer li_NumMsWaited
oleobject loo_SbJson

li_Success = 0

// To further clarify, see OAuth 2.0 Authorization Flow

loo_Oauth2 = create oleobject
li_rc = loo_Oauth2.ConnectToNewObject("Chilkat.OAuth2")
if li_rc < 0 then
    destroy loo_Oauth2
    MessageBox("Error","Connecting to COM object failed")
    return
end if

// For Google OAuth2, set the listen port equal to the port used
// in the Authorized Redirect URL for the Client ID.
// For example, in this case the Authorized Redirect URL would be http://localhost:55568/
// Your app should choose a port not likely not used by another application.
loo_Oauth2.ListenPort = 55568

loo_Oauth2.AuthorizationEndpoint = "https://accounts.google.com/o/oauth2/v2/auth"
loo_Oauth2.TokenEndpoint = "https://www.googleapis.com/oauth2/v4/token"

// Replace this with your actual client ID.
loo_Oauth2.ClientId = "GOOGLE-CLIENT-ID"

// This is the scope for Google Drive.
// See https://developers.google.com/identity/protocols/googlescopes
// Add the scopes that you need.
loo_Oauth2.Scope = "https://www.googleapis.com/auth/drive"

// Begin the OAuth2 authorization code flow.  This returns a URL that should be loaded in a browser.
ls_Url = loo_Oauth2.StartAuth()
if loo_Oauth2.LastMethodSuccess <> 1 then
    Write-Debug loo_Oauth2.LastErrorText
    destroy loo_Oauth2
    return
end if

// Launch the default browser on the system and navigate to the url.
// The LaunchBrowser method was added in Chilkat v10.1.2.
li_Success = loo_Oauth2.LaunchBrowser(ls_Url)
if li_Success = 0 then
    Write-Debug loo_Oauth2.LastErrorText
    destroy loo_Oauth2
    return
end if

// Wait for the interactive user to grant permission in the interactive browser session.
// We'll wait for a max of 90 seconds.
li_NumMsWaited = 0
do while (li_NumMsWaited < 90000) AND (loo_Oauth2.AuthFlowState < 3)
    loo_Oauth2.SleepMs(100)
    li_NumMsWaited = li_NumMsWaited + 100
loop

// If there was no response from the browser within 90 seconds, then 
// the AuthFlowState will be equal to 1 or 2.
// 1: Waiting for Redirect. The OAuth2 background thread is waiting to receive the redirect HTTP request from the browser.
// 2: Waiting for Final Response. The OAuth2 background thread is waiting for the final access token response.
// In that case, cancel the background task started in the call to StartAuth.
if loo_Oauth2.AuthFlowState < 3 then
    loo_Oauth2.Cancel()
    Write-Debug "No response from the browser!"
    destroy loo_Oauth2
    return
end if

// Check the AuthFlowState to see if authorization was granted, denied, or if some error occurred
// The possible AuthFlowState values are:
// 3: Completed with Success. The OAuth2 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property.
// 4: Completed with Access Denied. The OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property.
// 5: Failed Prior to Completion. The OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property.
if loo_Oauth2.AuthFlowState = 5 then
    Write-Debug "OAuth2 failed to complete."
    Write-Debug loo_Oauth2.FailureInfo
    destroy loo_Oauth2
    return
end if

if loo_Oauth2.AuthFlowState = 4 then
    Write-Debug "OAuth2 authorization was denied."
    Write-Debug loo_Oauth2.AccessTokenResponse
    destroy loo_Oauth2
    return
end if

if loo_Oauth2.AuthFlowState <> 3 then
    Write-Debug "Unexpected AuthFlowState:" + string(loo_Oauth2.AuthFlowState)
    destroy loo_Oauth2
    return
end if

// Save the full JSON access token response to a file.
loo_SbJson = create oleobject
li_rc = loo_SbJson.ConnectToNewObject("Chilkat.StringBuilder")

loo_SbJson.Append(loo_Oauth2.AccessTokenResponse)
loo_SbJson.WriteFile("qa_data/tokens/_googleDrive.json","utf-8",0)

// The saved JSON response looks like this:

// 	{
// 	 "access_token": "ya39.Ci-XA_C5bGgRDC3UaD-h0_NeL-DVIQnI2gHtBBBHkZzrwlARkwX6R3O0PCDEzRlfaQ",
// 	 "token_type": "Bearer",
// 	 "expires_in": 3600,
// 	 "refresh_token": "1/r_2c_7jddspcdfesrrfKqfXtqo08D6Q-gUU0DsdfVMsx0c"
// 	}
// 
Write-Debug "OAuth2 authorization granted!"
Write-Debug "Access Token = " + loo_Oauth2.AccessToken

// Here is an example showing how to define your OAuth 2.0 Credential in the Google Cloud Console
// Note: Even though your application is technically not a web app, you should still select "Web Application"
// because the Redirect URI is going to http://localhost:55568/ where Chilkat will receive it in a background thread.

// 


destroy loo_Oauth2
destroy loo_SbJson