Add image attachements

index.php

@@ -7,7 +7,8 @@
 	*	For educational purposes only.
 	*	The Server produces an Actor who can be followed.
 	*	The Actor can send messages to followers.
-	*	Those messages can have linkable URls, hashtags, and mentions.
+	*	The message can have linkable URls, hashtags, and mentions.
+	*	An image and alt text can be attached to the message.
 	*	The Server saves logs about requests it receives and sends.
 	*	This code is NOT suitable for production use.
 	*	SPDX-License-Identifier: AGPL-3.0-or-later
@@ -381,6 +382,10 @@ echo <<< HTML
 		<form action="/send" method="post" enctype="multipart/form-data">
 			<label   for="content">Your message:</label><br>
 			<textarea id="content"  name="content" rows="5" cols="32"></textarea><br>
+			<label   for="image">Attach an image</label><br>
+			<input  type="file"     name="image" id="image" accept="image/*"><br>
+			<label   for="alt">Alt Text</label>
+			<input  type="text"     name="alt" id="alt" size="32" /><br>
 			<label   for="password">Password</label><br>
 			<input  type="password" name="password" id="password" size="32"><br>
 			<input  type="submit"  value="Post Message"> 
@@ -406,6 +411,46 @@ HTML;
 		//	Process the content into HTML to get hashtags etc
 		list( "HTML" => $content, "TagArray" => $tags ) = process_content( $content );
 
+		//	Is there an image attached?
+		if ( isset( $_FILES['image']['tmp_name'] ) && ("" != $_FILES['image']['tmp_name'] ) ) {
+			//	Get information about the image
+			$image      = $_FILES['image']['tmp_name'];
+			$image_info = getimagesize( $image );
+			$image_ext  = image_type_to_extension( $image_info[2] );
+			$image_mime = $image_info["mime"];
+
+			//	Files are stored according to their hash
+			//	A hash of "abc123" is stored in "/images/abc123.jpg"
+			$sha1 = sha1_file( $image );
+			$image_path = "images";
+			$image_full_path = "{$image_path}/{$sha1}.{$image_ext}";
+
+			//	Move media to the correct location
+			//	Create a directory if it doesn't exist
+			if( ! is_dir( $image_path ) ) { 
+				mkdir( $image_path ); 
+			}
+			move_uploaded_file($image, $image_full_path );
+
+			//	Get the alt text
+			if ( isset( $_POST["alt"] ) ) {
+				$alt = $_POST["alt"];
+			} else {
+				$alt = "";
+			}
+
+			//	Construct the attachment value for the post
+			$attachment = [
+				"type"      => "Image",
+				"mediaType" => "{$image_mime}",
+				"url"       => "https://{$server}/{$image_full_path}",
+				"name"      => $alt
+		  ];
+
+		} else {
+			$attachment = [];
+		}
+
 		//	Current time - ISO8601
 		$timestamp = date( "c" );
 
@@ -426,7 +471,8 @@ HTML;
 			"content"      => $content,
 			"contentMap"   => ["en" => $content],
 			"to"           => ["https://www.w3.org/ns/activitystreams#Public"],
-			"tag"          => $tags
+			"tag"          => $tags,
+			"attachment"   => $attachment
 		];
 
 		//	Construct the Message