Method: Authenticate the user if authentication wasn’t performed during the determine_current_user action.

Method: Check that the API keys provided have the proper key-specific permissions to either read or write API resources.

Method: Updated API Key last access datetime.

Method: If the consumer_key and consumer_secret $_GET parameters are NOT provided and the Basic auth headers are either not present or the consumer secret does not match the consumer key provided, then return the correct Basic headers and an error message.

Method: Check for user permissions and register last access.

Method: Creates an array of urlencoded strings out of each array key/value pairs.

Method: Normalize each parameter by assuming each parameter may have already been encoded, so attempt to decode, and then re-encode according to RFC 3986.

Method: Verify that the timestamp and nonce provided with the request are valid. This prevents replay attacks where an attacker could attempt to re-send an intercepted request at a later time.

Method: Return the user data for the given consumer_key.