(PHP ActiveX) Google OAuth2 Access Token

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

Note: This example requires Chilkat v10.1.2 or later.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

// To further clarify, see OAuth 2.0 Authorization Flow

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.OAuth2')
$oauth2 = new COM("Chilkat.OAuth2");

// 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.
$oauth2->ListenPort = 55568;

$oauth2->AuthorizationEndpoint = 'https://accounts.google.com/o/oauth2/v2/auth';
$oauth2->TokenEndpoint = 'https://www.googleapis.com/oauth2/v4/token';

// Replace this with your actual client ID.
$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.
$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.
$url = $oauth2->startAuth();
if ($oauth2->LastMethodSuccess != 1) {
    print $oauth2->LastErrorText . "\n";
    exit;
}

// Launch the default browser on the system and navigate to the url.
// The LaunchBrowser method was added in Chilkat v10.1.2.
$success = $oauth2->LaunchBrowser($url);
if ($success == 0) {
    print $oauth2->LastErrorText . "\n";
    exit;
}

// Wait for the interactive user to grant permission in the interactive browser session.
// We'll wait for a max of 90 seconds.
$numMsWaited = 0;
while (($numMsWaited < 90000) and ($oauth2->AuthFlowState < 3)) {
    $oauth2->SleepMs(100);
    $numMsWaited = $numMsWaited + 100;
}

// 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 ($oauth2->AuthFlowState < 3) {
    $oauth2->Cancel();
    print 'No response from the browser!' . "\n";
    exit;
}

// 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 ($oauth2->AuthFlowState == 5) {
    print 'OAuth2 failed to complete.' . "\n";
    print $oauth2->FailureInfo . "\n";
    exit;
}

if ($oauth2->AuthFlowState == 4) {
    print 'OAuth2 authorization was denied.' . "\n";
    print $oauth2->AccessTokenResponse . "\n";
    exit;
}

if ($oauth2->AuthFlowState != 3) {
    print 'Unexpected AuthFlowState:' . $oauth2->AuthFlowState . "\n";
    exit;
}

// Save the full JSON access token response to a file.
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.StringBuilder')
$sbJson = new COM("Chilkat.StringBuilder");
$sbJson->Append($oauth2->AccessTokenResponse);
$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"
// 	}
// 
print 'OAuth2 authorization granted!' . "\n";
print 'Access Token = ' . $oauth2->AccessToken . "\n";

// 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.

// 

?>