(Ruby) Automatically Refresh Token for 401 Unauthorized

Demonstrates how to automatically refresh an access token (without user interaction) when the token expires and a 401 Unauthorized response is received.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

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

tokenFilePath = "qa_data/tokens/googleCalendar.json"

# Get our current access token.
jsonToken = Chilkat::CkJsonObject.new()
success = jsonToken.LoadFile(tokenFilePath)
if (jsonToken.HasMember("access_token") == false)
    print "No access token found." + "\n";
    exit
end

http = Chilkat::CkHttp.new()
http.put_AuthToken(jsonToken.stringOf("access_token"))

jsonResponse = http.quickGetStr("https://www.googleapis.com/calendar/v3/users/me/calendarList")
if (http.get_LastMethodSuccess() != true)

    if (http.get_LastStatus() != 401)
        print http.lastErrorText() + "\n";
        print "----" + "\n";
        print http.lastResponseBody() + "\n";
        exit
    end

    # The access token must've expired. 
    # Refresh the access token and then retry the request.
    oauth2 = Chilkat::CkOAuth2.new()

    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")

    # Get the "refresh_token"
    oauth2.put_RefreshToken(jsonToken.stringOf("refresh_token"))

    # Send the HTTP POST to refresh the access token..
    success = oauth2.RefreshAccessToken()
    if (success != true)
        print oauth2.lastErrorText() + "\n";
        exit
    end

    # The response contains a new access token, but we must keep
    # our existing refresh token for when we need to refresh again in the future.
    jsonToken.UpdateString("access_token",oauth2.accessToken())

    # Save the new JSON access token response to a file.
    sbJson = Chilkat::CkStringBuilder.new()
    jsonToken.put_EmitCompact(false)
    jsonToken.EmitSb(sbJson)
    sbJson.WriteFile(tokenFilePath,"utf-8",false)

    print "OAuth2 authorization granted!" + "\n";
    print "New Access Token = " + oauth2.accessToken() + "\n";

    # re-try the original request.
    http.put_AuthToken(oauth2.accessToken())
    jsonResponse = http.quickGetStr("https://www.googleapis.com/calendar/v3/users/me/calendarList")
    if (http.get_LastMethodSuccess() != true)
        print http.lastErrorText() + "\n";
        exit
    end

end

print jsonResponse + "\n";
print "-----------------------------" + "\n";