Add function for checking the mime type of a remove file

src/MD_STD.php

@@ -576,6 +576,36 @@ final class MD_STD {
 
     }
 
+    /**
+     * Wrapper around the finfo functions to get the mime content type of a file.
+     *
+     * @param string $filepath Expected file path.
+     *
+     * @return string
+     */
+    public static function remote_mime_content_type(string $url):string {
+
+        if (($tmp_file = \tempnam(\sys_get_temp_dir(), "remote_mime_type_check")) === false) {
+            throw new Exception("Failed to get temporary file location");
+        }
+
+        $fp = \fopen($tmp_file, 'w');
+
+        if (!($ch = \curl_init($url))) {
+            throw new Exception("Failed to initialize curl for $url");
+        };
+
+        \curl_setopt($ch, CURLOPT_FILE, $fp);
+        \curl_exec($ch);
+        \curl_close($ch);
+
+        $mime_type = MD_STD::mime_content_type($tmp_file);
+        \unlink($tmp_file);
+
+        return $mime_type;
+
+    }
+
     /**
      * Checks if a file exists, with one of the expected mime types.
      *