Perl

Google Photos OAuth2 Access Token

See more Google Photos Examples

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

use chilkat();

$success = 0;

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$oauth2 = chilkat::CkOAuth2->new();

# 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:3017/
# Your app should choose a port not likely not used by any other application.
$oauth2->put_ListenPort(3017);

$oauth2->put_AuthorizationEndpoint("https://accounts.google.com/o/oauth2/v2/auth");
$oauth2->put_TokenEndpoint("https://www.googleapis.com/oauth2/v4/token");

# Replace these with actual values.
$oauth2->put_ClientId("GOOGLE-CLIENT-ID");
$oauth2->put_ClientSecret("GOOGLE-CLIENT-SECRET");

$oauth2->put_CodeChallenge(1);
$oauth2->put_CodeChallengeMethod("S256");

# This is a scope for Google Photos.  See https://developers.google.com/photos/library/guides/authentication-authorization
# This scope provides read/write access but not sharing.
$oauth2->put_Scope("https://www.googleapis.com/auth/photoslibrary");

# Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
$url = $oauth2->startAuth();
if ($oauth2->get_LastMethodSuccess() == 0) {
    print $oauth2->lastErrorText() . "\r\n";
    exit;
}

# Launch the system's default browser navigated to the URL.
$success = $oauth2->LaunchBrowser($url);
if ($success == 0) {
    print $oauth2->lastErrorText() . "\r\n";
    exit;
}

# Now wait for the authorization.
# We'll wait for a max of 120 seconds.
$numMsWaited = 0;
while (($numMsWaited < 120000) and ($oauth2->get_AuthFlowState() < 3)) {
    $oauth2->SleepMs(100);
    $numMsWaited = $numMsWaited + 100;
}

# If there was no response from the browser within 120 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->get_AuthFlowState() < 3) {
    $oauth2->Cancel();
    print "No response from the browser!" . "\r\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->get_AuthFlowState() == 5) {
    print "OAuth2 failed to complete." . "\r\n";
    print $oauth2->failureInfo() . "\r\n";
    exit;
}

if ($oauth2->get_AuthFlowState() == 4) {
    print "OAuth2 authorization was denied." . "\r\n";
    print $oauth2->accessTokenResponse() . "\r\n";
    exit;
}

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

# Save the full JSON access token response to a file.
$sbJson = chilkat::CkStringBuilder->new();
$sbJson->Append($oauth2->accessTokenResponse());
$sbJson->WriteFile("qa_data/tokens/googlePhotos.json","utf-8",0);

# The saved JSON response looks like this:
# {
#   "access_token": "ya29.GlamBqWR6cp8lEfJMmTHVEua45912XLKoq4djyHl_Z3CEIzsPLIZkJSGie5oOrbaggy1rjJHn1zW5bjqSesGr5MEYIp9Hx-0CuvjVYf8srg2jeaDMwMACvzemp43",
#   "expires_in": 3600,
#   "refresh_token": "1/rl6k16nysDl9Bp1EhRH9F1WyRIoiSQAvko49Z4yY694MT5V1QXLj2ibNZGaRgek0",
#   "scope": "https://www.googleapis.com/auth/photoslibrary",
#   "token_type": "Bearer"
# }

print "OAuth2 authorization granted!" . "\r\n";
print "Access Token = " . $oauth2->accessToken() . "\r\n";