Key invalid character check

src/Flintstone/FlintstoneDB.php

@@ -512,15 +512,19 @@ private function preserveLines($data, $reverse) {
 	 * @return boolean
 	 */
 	private function isValidKey($key) {
-        	if (!is_string($key)) {
-            		throw new FlintstoneException('Key must be string');
-        	}
+		if (!is_string($key)) {
+			throw new FlintstoneException('Key must be a string');
+		}
 
-        	if (strlen($key) > 1024) {
-            		throw new FlintstoneException('Maximum key length is 1024 characters');
-        	}
+		if (strlen($key) > 1024) {
+			throw new FlintstoneException('Maximum key length is 1024 characters');
+		}
 
-        	return true;
+		if (strpos($key, '=') !== false) {
+			throw new FlintstoneException('Key may not contain the equals character');
+		}
+
+		return true;
 	}
 
 	/**

tests/FeatureTest.php

@@ -33,19 +33,27 @@ public function testInvalidKey() {
 		$this->db->get(1);
 	}
 
+	/**
+	 * Test invalid character key
+	 * @expectedException Flintstone\FlintstoneException
+	 */
+	public function testInvalidChrKey() {
+		$this->db->get('a=b');
+	}
+
 	/**
 	 * Test blank key
 	 */
 	public function testBlankKey() {
 		$this->assertFalse($this->db->get(''));
 	}
 
-    	/**
-     	 * Test complex key
-     	*/
-    	public function testComplexKey() {
-        	$this->assertFalse($this->db->get('users:1:name'));
-    	}
+	/**
+	 * Test complex key
+	*/
+	public function testComplexKey() {
+		$this->assertFalse($this->db->get('users:1:name'));
+	}
 
 	/**
 	 * Test huge key