From 838c071cee7536c6509cbffd2baa0cf12c5179f4 Mon Sep 17 00:00:00 2001
From: Terence Eden <github.com@shkspr.mobi>
Date: Sat, 17 Feb 2024 20:48:03 +0000
Subject: [PATCH] Add mentions

---
 README.md |  1 +
 index.php | 36 ++++++++++++++++++++++++++++++++----
 2 files changed, 33 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index e6f7cae..3f5ff67 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,7 @@ Optionally, upload an `icon.png` to make the user look nice.
 * The `index.php` file performs a specific action depending on the path requested.
 * Log files are saved as .txt in the `/logs` directory.
 * Post files are saved as .json in the `/posts` directory.
+* This has sloppy support for linking #hashtags, https:// URls, and @ mentions.
 
 ##	Requirements
 
diff --git a/index.php b/index.php
index dcd4b06..d17de4d 100644
--- a/index.php
+++ b/index.php
@@ -485,8 +485,8 @@ HTML;
 		//	Get any hashtags
 		$hashtags = [];
 		$hashtag_pattern = '/(?:^|\s)\#(\w+)/';	//	Beginning of string, or whitespace, followed by #
-		preg_match_all( $hashtag_pattern, $content, $matches );
-		foreach ($matches[1] as $match) {
+		preg_match_all( $hashtag_pattern, $content, $hashtag_matches );
+		foreach ($hashtag_matches[1] as $match) {
 			$hashtags[] = $match;
 		}
 
@@ -501,15 +501,43 @@ HTML;
 
 		//	Add HTML links for hashtags into the text
 		$content = preg_replace(
-			'/(?<!\S)#([0-9\p{L}]+)/u', 
+			$hashtag_pattern, 
 			"<a href='https://{$server}/tag/$1'>#$1</a>", 
 			$content
 		);
 
+		//	Detect user mentions
+		$usernames = [];
+		$usernames_pattern = '/@(\S+)@(\S+)/'; //	This is a *very* sloppy regex
+		preg_match_all( $usernames_pattern, $content, $usernames_matches );
+		foreach ( $usernames_matches[0] as $match ) {
+			$usernames[] = $match;
+		}
+
+		//	Construct the mentions value for the note object
+		//	This goes in the generic "tag" property
+		//	TODO: Add this to the CC field
+		foreach ( $usernames as $username ) {
+			list( $null, $user, $domain ) = explode( "@", $username );
+			$tags[] = array(
+				"type" => "Mention",
+				"href" => "https://{$domain}/@{$user}",
+				"name" => "{$username}"
+			);
+
+			//	Add HTML links to usernames
+			$username_link = "<a href=\"https://{$domain}/@{$user}\">$username</a>";
+			$content = str_replace( $username, $username_link, $content );
+
+		}
+
 		//	Construct the content
 		$content = "<p>{$content}</p>";
 
-		return ["HTML" => $content, "TagArray" => $tags];
+		return [
+			"HTML" => $content, 
+			"TagArray" => $tags
+		];
 	}
 
 //	"One to stun, two to kill, three to make sure"