Merged in feature/from-pantheon (pull request #16)

code from pantheon

* code from pantheon

wp/wp-content/plugins/wordpress-seo/src/exceptions/oauth/authentication-failed-exception.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace Yoast\WP\SEO\Exceptions\OAuth;
+
+use Exception;
+
+/**
+ * Class Authentication_Failed_Exception
+ */
+class Authentication_Failed_Exception extends Exception {
+
+	/**
+	 * Authentication_Failed_Exception constructor.
+	 *
+	 * @param Exception $original_exception The original exception.
+	 */
+	public function __construct( Exception $original_exception ) {
+		parent::__construct( 'Authentication failed', 401, $original_exception );
+	}
+
+	/**
+	 * Returns a formatted response object.
+	 *
+	 * @return object The response object.
+	 */
+	public function get_response() {
+		return (object) [
+			'tokens' => [],
+			'error'  => $this->getMessage() . ': ' . $this->getPrevious()->getMessage(),
+			'status' => $this->getCode(),
+		];
+	}
+}

wp/wp-content/plugins/wordpress-seo/src/exceptions/oauth/tokens/empty-property-exception.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Yoast\WP\SEO\Exceptions\OAuth\Tokens;
+
+use Exception;
+
+/**
+ * Class Empty_Property_Exception
+ */
+class Empty_Property_Exception extends Exception {
+
+	/**
+	 * Empty_Property_Exception constructor.
+	 *
+	 * @param string $property The property that is empty.
+	 */
+	public function __construct( $property ) {
+		parent::__construct( \sprintf( 'Token creation failed. Property `%s` cannot be empty.', $property ), 400 );
+	}
+}

wp/wp-content/plugins/wordpress-seo/src/exceptions/oauth/tokens/empty-token-exception.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Yoast\WP\SEO\Exceptions\OAuth\Tokens;
+
+use Exception;
+
+/**
+ * Class Empty_Token_Exception
+ */
+class Empty_Token_Exception extends Exception {
+
+	/**
+	 * Empty_Token_Exception constructor.
+	 */
+	public function __construct() {
+		parent::__construct( 'Token usage failed. Token is empty.', 400 );
+	}
+}

wp/wp-content/plugins/wordpress-seo/src/exceptions/oauth/tokens/failed-storage-exception.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Yoast\WP\SEO\Exceptions\OAuth\Tokens;
+
+use Exception;
+
+/**
+ * Class Failed_Storage_Exception
+ */
+class Failed_Storage_Exception extends Exception {
+
+	const DEFAULT_MESSAGE = 'Token storing failed. Please try again.';
+
+	/**
+	 * Failed_Storage_Exception constructor.
+	 *
+	 * @param string $reason The reason why token storage failed. Optional.
+	 */
+	public function __construct( $reason = '' ) {
+		$message = ( $reason ) ? \sprintf( 'Token storing failed. Reason: %s. Please try again', $reason ) : self::DEFAULT_MESSAGE;
+
+		parent::__construct( $message, 500 );
+	}
+}