Reverse old embed HTML if it has videopress URLs in it

modules/videopress/utility-functions.php

@@ -692,3 +692,37 @@ function videopress_get_attachment_url( $post_id ) {
 	// If the URL is a string, return it. Otherwise, we shouldn't to avoid errors downstream, so null.
 	return ( is_string( $return ) ) ? $return : null;
 }
+
+/**
+ * Converts VideoPress flash embeds into oEmbed-able URLs.
+ *
+ * Older VideoPress embed depended on Flash, which no longer work,
+ * so let us convert them to an URL that WordPress can oEmbed.
+ *
+ * Note that this file is always loaded via modules/module-extras.php and is not dependent on module status.
+ *
+ * @param string $content the content.
+ * @return string filtered content
+ */
+function jetpack_videopress_flash_embed_filter( $content ) {
+	$regex   = '%<embed[^>]*+>(?:\s*</embed>)?%i';
+	$content = preg_replace_callback(
+		$regex,
+		function( $matches, $orig_html = null ) {
+			$embed_code  = $matches[0];
+			$url_matches = array();
+
+			// get video ID from flash URL.
+			$url_matched = preg_match( '/src="http:\/\/v.wordpress.com\/([^"]+)"/', $embed_code, $url_matches );
+
+			if ( $url_matched ) {
+				$video_id = $url_matches[1];
+				return "https://videopress.com/v/$video_id";
+			}
+		},
+		$content
+	);
+	return $content;
+}
+
+add_filter( 'the_content', 'jetpack_videopress_flash_embed_filter', 7 ); // Needs to be priority 7 to allow Core to oEmbed.

phpunit.xml.dist

@@ -60,6 +60,9 @@
 		<testsuite name="verification-tools">
 			<directory prefix="test_" suffix=".php">tests/php/modules/verification-tools</directory>
 		</testsuite>
+		<testsuite name="videopress">
+			<directory prefix="test_" suffix=".php">tests/php/modules/videopress</directory>
+		</testsuite>
 		<testsuite name="wpcom-block-editor">
 			<directory prefix="test_" suffix=".php">tests/php/modules/wpcom-block-editor</directory>
 		</testsuite>

tests/php/modules/videopress/test_functions.utility-functions.php

@@ -0,0 +1,31 @@
+<?php
+/**
+ * Class WP_Test_Jetpack_VideoPress_Utility_Functions
+ *
+ * Note that modules/videopress/utility-functions.php is automatically loaded and does not need to be required in this file.
+ *
+ * @package Jetpack
+ */
+
+/**
+ * Tests Jetpack_VideoPress_Utility_Functions
+ */
+class WP_Test_Jetpack_VideoPress_Utility_Functions extends WP_UnitTestCase {
+
+	/**
+	 * Tests the VideoPress Flash to oEmbedable URL filter.
+	 *
+	 * @author kraftbj
+	 * @covers jetpack_videopress_flash_embed_filter
+	 * @since 8.1.0
+	 */
+	public function test_jetpack_videopress_flash_embed_filter_flash() {
+		$content  = '<p><embed src="http://v.wordpress.com/YtfS78jH" type="application/x-shockwave-flash" width="600" height="338"></embed></p>';
+		$contains = 'https://videopress.com/v/YtfS78jH';
+
+		$filtered = jetpack_videopress_flash_embed_filter( $content );
+
+		$this->assertContains( $contains, $filtered );
+	}
+
+}