Add File::mime()

Fixes #1051

lib/Cake/Test/Case/Utility/FileTest.php

@@ -463,6 +463,17 @@ public function testCopy() {
 		$TmpFile->close();
 	}
 
+/**
+ * Test mime()
+ *
+ * @return void
+ */
+	public function testMime() {
+		$path = CAKE . 'Test' . DS . 'test_app' . DS . 'webroot' . DS . 'img' . DS . 'cake.power.gif';
+		$file = new File($path);
+		$this->assertEquals('image/gif', $file->mime());
+	}
+
 /**
  * getTmpFile method
  *

lib/Cake/Utility/File.php

@@ -291,9 +291,16 @@ public function delete() {
 	}
 
 /**
- * Returns the File info.
+ * Returns the File info as an array with the following keys:
  *
- * @return string The File extension
+ * - dirname
+ * - basename
+ * - extension
+ * - filename
+ * - filesize
+ * - mime
+ *
+ * @return array File information.
  * @link http://book.cakephp.org/2.0/en/core-utility-libraries/file-folder.html#File::info
  */
 	public function info() {
@@ -306,6 +313,9 @@ public function info() {
 		if (!isset($this->info['filesize'])) {
 			$this->info['filesize'] = $this->size();
 		}
+		if (!isset($this->info['mime'])) {
+			$this->info['mime'] = $this->mime();
+		}
 		return $this->info;
 	}
 
@@ -536,4 +546,22 @@ public function copy($dest, $overwrite = true) {
 		}
 		return copy($this->path, $dest);
 	}
+
+/**
+ * Get the mime type of the file.  Uses the finfo extension if 
+ * its available, otherwise falls back to mime_content_type
+ *
+ * @return false|string The mimetype of the file, or false if reading fails.
+ */
+	public function mime() {
+		if (function_exists('finfo_open')) {
+			$finfo = finfo_open(FILEINFO_MIME);
+			list($type, $charset) = explode(';', finfo_file($finfo, $this->pwd()));
+			return $type;
+		} else if (function_exists('mime_content_type')) {
+			return mime_content_type($this->pwd());
+		}
+		return false;
+	}
+
 }