Reply Block: Embed referenced post when possible

Fixes #1027.

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Improved
 
 * Direct Messages: Improve HTML to e-mail text conversion
+* The Reply block now shows an embedded version of the referenced post, if available
 
 ## [4.5.1] - 2024-12-18
 

includes/class-blocks.php

@@ -339,7 +339,19 @@ public static function render_reply_block( $attrs ) {
 		$html = '';
 
 		if ( ! empty( $attrs['url'] ) ) {
-			$html = sprintf(
+			wp_oembed_add_provider( '#https?://mastodon\.social/(@.+)/([0-9]+)#i', 'https://mastodon.social/api/oembed', true );
+
+			/**
+			 * Fires to add an oEmbed provider for the reply block.
+			 */
+			do_action( 'activitypub_reply_block_add_oembed_provider' );
+
+			$embed = wp_oembed_get( $attrs['url'] );
+			if ( $embed ) {
+				$html .= $embed;
+			}
+
+			$html .= sprintf(
 				'<p><a title="%2$s" aria-label="%2$s" href="%1$s" class="u-in-reply-to" target="_blank">%3$s</a></p>',
 				esc_url( $attrs['url'] ),
 				esc_attr__( 'This post is a response to the referenced content.', 'activitypub' ),

readme.txt

@@ -135,6 +135,7 @@ For reasons of data protection, it is not possible to see the followers of other
 = Unreleased =
 
 * Improved: HTML to e-mail text conversion
+* Improved: The Reply block now shows an embedded version of the referenced post, if available
 
 = 4.5.1 =
 

tests/includes/class-test-blocks.php

@@ -48,4 +48,42 @@ public function test_render_reply_block_with_empty_url() {
 		$output = \Activitypub\Blocks::render_reply_block( $attrs );
 		$this->assertEmpty( $output );
 	}
+
+	/**
+	 * Test the render_reply_block() method with a Mastodon URL that has an embed.
+	 *
+	 * @covers ::render_reply_block
+	 */
+	public function test_render_reply_block_with_mastodon_embed() {
+		$mock_embed = '<div class="mastodon-embed">Mock Embed Content</div>';
+		add_filter(
+			'pre_oembed_result',
+			function () use ( $mock_embed ) {
+				return $mock_embed;
+			}
+		);
+
+		$attrs  = array( 'url' => 'https://mastodon.social/@user/123456' );
+		$output = \Activitypub\Blocks::render_reply_block( $attrs );
+
+		$this->assertStringContainsString( $mock_embed, $output, 'Output should contain the embedded content.' );
+		$this->assertStringContainsString( 'u-in-reply-to', $output, 'Output should still contain the reply link.' );
+		$this->assertStringContainsString( 'mastodon.social/@user/123456', $output, 'Output should contain the formatted URL.' );
+	}
+
+	/**
+	 * Test the render_reply_block() method with a URL that has no available embed.
+	 *
+	 * @covers ::render_reply_block
+	 */
+	public function test_render_reply_block_with_no_embed() {
+		add_filter( 'pre_oembed_result', '__return_false' );
+
+		$attrs  = array( 'url' => 'https://example.com/no-embed' );
+		$output = \Activitypub\Blocks::render_reply_block( $attrs );
+
+		$this->assertStringNotContainsString( '<blockquote', $output, 'Output should not contain any embedded content.' );
+		$this->assertStringContainsString( 'u-in-reply-to', $output, 'Output should contain the reply link.' );
+		$this->assertStringContainsString( 'example.com/no-embed', $output, 'Output should contain the formatted URL.' );
+	}
 }