Add Redirect & Override Attributes Support to Shortcodes.

* Adds support for setting the redirect cookie when shortcodes are used.
* Adds support for overriding some attributes for authentication URLs
  and login buttons when using the shortcodes.
* Fixes code formatting.

includes/openid-connect-generic-client-wrapper.php

@@ -97,10 +97,21 @@ class OpenID_Connect_Generic_Client_Wrapper {
 	/**
 	 * Get the authentication url from the client
 	 * 
+	 * @param array $atts The optional attributes array when called via a shortcode.
+	 *
 	 * @return string
 	 */
-	function get_authentication_url(){
+	function get_authentication_url( $atts = array() ){
-		return $this->client->make_authentication_url();
+
+		if ( ! empty( $atts['redirect_to'] ) ) {
+			// Set the request query parameter used to set the cookie redirect.
+			$_REQUEST['redirect_to'] = $atts['redirect_to'];
+			$login_form = new OpenID_Connect_Generic_Login_Form( $this->settings, $this );
+			$login_form->handle_redirect_cookie();
+		}
+    
+		return $this->client->make_authentication_url( $atts );
+
 	}
 
 	/**

includes/openid-connect-generic-client.php

@@ -45,20 +45,28 @@ class OpenID_Connect_Generic_Client {
 	/**
 	 * Create a single use authentication url
 	 *
+	 * @param array $atts An optional array of override/feature attributes.
+	 *
 	 * @return string
 	 */
-	function make_authentication_url() {
+	function make_authentication_url( $atts = array() ) {
+
+		$endpoint_login = ( ! empty( $atts['endpoint_login'] ) ) ? $atts['endpoint_login'] : $this->endpoint_login;
+		$scope = ( ! empty( $atts['scope'] ) ) ? $atts['scope'] : $this->scope;
+		$client_id = ( ! empty( $atts['client_id'] ) ) ? $atts['client_id'] : $this->client_id;
+		$redirect_uri = ( ! empty( $atts['redirect_uri'] ) ) ? $atts['redirect_uri'] : $this->redirect_uri;
+    
 		$separator = '?';
 		if ( stripos( $this->endpoint_login, '?' ) !== FALSE ) {
 			$separator = '&';
 		}
 		$url = sprintf( '%1$s%2$sresponse_type=code&scope=%3$s&client_id=%4$s&state=%5$s&redirect_uri=%6$s',
-			$this->endpoint_login,
+			$endpoint_login,
 			$separator,
-			rawurlencode( $this->scope ),
+			rawurlencode( $scope ),
-			rawurlencode( $this->client_id ),
+			rawurlencode( $client_id ),
 			$this->new_state(),
-			rawurlencode( $this->redirect_uri )
+			rawurlencode( $redirect_uri )
 		);
 
 		$this->logger->log( apply_filters( 'openid-connect-generic-auth-url', $url ), 'make_authentication_url' );

includes/openid-connect-generic-login-form.php

@@ -128,12 +128,20 @@ class OpenID_Connect_Generic_Login_Form {
 
 	/**
 	 * Create a login button (link)
+	 * 
+	 * @param array $atts Array of optional attributes to override login buton 
+	 * functionality when used by shortcode.
 	 *
 	 * @return string
 	 */
-	function make_login_button() {
+	function make_login_button( $atts = array() ) {
-		$text = apply_filters( 'openid-connect-generic-login-button-text', __( 'Login with OpenID Connect' ) );
+		$button_text = __( 'Login with OpenID Connect' );
-		$href = $this->client_wrapper->get_authentication_url();
+		if ( ! empty( $atts['button_text'] ) ) {
+			$button_text = $atts['button_text'];
+		}
+    
+		$text = apply_filters( 'openid-connect-generic-login-button-text', $button_text );
+		$href = $this->client_wrapper->get_authentication_url( $atts );
 
 		ob_start();
 		?>