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(Ruby) Google OAuth2 Access Token

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

Chilkat Ruby Downloads

Ruby Library for Linux and MAC OS X

require 'chilkat'

#  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:55568/
#  Your app should choose a port not likely not used by any other application.
oauth2.put_ListenPort(55568)

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(true)
oauth2.put_CodeChallengeMethod("S256")

#  This is the scope for Google Drive.
#  See https://developers.google.com/identity/protocols/googlescopes
oauth2.put_Scope("https://www.googleapis.com/auth/drive")

#  Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
url = oauth2.startAuth()
if (oauth2.get_LastMethodSuccess() != true)
    print oauth2.lastErrorText() + "\n";
    exit
end

#  At this point, your application should load the URL in a browser.
#  For example,
#  in C#:  System.Diagnostics.Process.Start(url);
#  in Java: Desktop.getDesktop().browse(new URI(url));
#  in VBScript: Set wsh=WScript.CreateObject("WScript.Shell")
#               wsh.Run url
#  The Google account owner would interactively accept or deny the authorization request.

#  Add the code to load the url in a web browser here...
#  Add the code to load the url in a web browser here...
#  Add the code to load the url in a web browser here...

#  Now wait for the authorization.
#  We'll wait for a max of 30 seconds.
numMsWaited = 0
while (numMsWaited < 30000) and (oauth2.get_AuthFlowState() < 3)
    oauth2.SleepMs(100)
    numMsWaited = numMsWaited + 100
end

#  If there was no response from the browser within 30 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!" + "\n";
    exit
end

#  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." + "\n";
    print oauth2.failureInfo() + "\n";
    exit
end

if (oauth2.get_AuthFlowState() == 4)
    print "OAuth2 authorization was denied." + "\n";
    print oauth2.accessTokenResponse() + "\n";
    exit
end

if (oauth2.get_AuthFlowState() != 3)
    print "Unexpected AuthFlowState:" + oauth2.get_AuthFlowState().to_s() + "\n";
    exit
end

#  Save the full JSON access token response to a file.
sbJson = Chilkat::CkStringBuilder.new()
sbJson.Append(oauth2.accessTokenResponse())
sbJson.WriteFile("qa_data/tokens/googleDrive.json","utf-8",false)

#  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";

 

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