Helper for parsing headers attributes

composer.json

@@ -15,7 +15,8 @@
 	],
 	"require": {
 		"php": ">=5.6.0",
-		"nette/utils": "^2.4"
+		"nette/utils": "^2.4",
+		"nette/tokenizer": "^2.2"
 	},
 	"require-dev": {
 		"nette/di": "^2.3",

src/Http/Helpers.php

@@ -49,6 +49,62 @@ public static function ipMatch($ip, $mask)
 	}
 
 
+	public static function parseHeader($value)
+	{
+		$tokenizer = new Nette\Utils\Tokenizer([
+			'word' => '[\\w!#$%&\'*+\\-.\\^`|\\~/]+', // "/" manually allowed
+
+			'quoted' => '"(?:\\\\[\x01-\x7F]|[^"\\\\\x00\x80-\xFF])*+"',
+			'equal' => '=',
+			'semicolon' => ';',
+			'ows' => '\h+',
+		]);
+
+		$tokens = $tokenizer->tokenize("$value;");
+		$parsed = [];
+		$k = NULL;
+		$v = NULL;
+		$e = FALSE;
+
+		foreach ($tokens as list($value, $offset, $type)) {
+			if ($type === 'word') {
+				if ($e && $v === NULL) {
+					$v = $value;
+				} elseif ($k === NULL) {
+					$k = $value;
+				} else {
+					throw new \Exception();
+				}
+
+			} elseif ($type === 'quoted') {
+				$value = stripslashes(substr($value, 1, -1));
+				if ($e && $v === NULL) {
+					$v = $value;
+				} else {
+					throw new \Exception();
+				}
+
+			} elseif ($type === 'semicolon') {
+				if ($k === NULL) {
+					throw new \Exception();
+				}
+				$parsed[$k] = $v;
+				$k = $v = NULL;
+				$e = FALSE;
+
+			} elseif ($type === 'equal') {
+				if ($e || $k === NULL) {
+					throw new \Exception();
+				}
+
+				$e = TRUE;
+			}
+		}
+
+		return $parsed;
+	}
+
+
 	/**
 	 * Removes duplicate cookies from response.
 	 * @return void

tests/Http/Helpers.phpt

@@ -45,3 +45,47 @@ test(function () {
 	Assert::same('Tue, 15 Nov 1994 08:12:31 GMT', Helpers::formatDate(new DateTime('1994-11-15T06:12:31-0200')));
 	Assert::same('Tue, 15 Nov 1994 08:12:31 GMT', Helpers::formatDate(784887151));
 });
+
+
+
+test(function () {
+	Assert::same(
+		['text/html' => NULL],
+		Helpers::parseHeader('text/html')
+	);
+
+	Assert::same(
+		['text/html' => NULL, 'charset' => 'iso-8859-1'],
+		Helpers::parseHeader('text/html; charset="iso-8859-1"')
+	);
+
+	Assert::same(
+		['text/html' => NULL, 'charset' => 'ISO-8859-4'],
+		Helpers::parseHeader('text/html; charset=ISO-8859-4')
+	);
+
+	Assert::same(
+		['text/html' => NULL, 'charset' => 'utf-8'],
+		Helpers::parseHeader('text/html;charset=utf-8')
+	);
+
+	Assert::same(
+		['INLINE' => NULL, 'FILENAME' => 'an example.html'],
+		Helpers::parseHeader('INLINE; FILENAME= "an example.html"')
+	);
+
+	// SUPPORT THIS?
+	Assert::same(
+		['attachment' => NULL, 'filename' => '€ rates'],
+		Helpers::parseHeader('attachment; filename*= UTF-8\'\'%e2%82%ac%20rates')
+	);
+
+/*
+
+	Content-Type: token "/" token params
+
+	params     = *( OWS ";" OWS parameter )
+	param      = token "=" ( token / quoted-string )
+
+ */
+});