AC-9831: Block template render enhancement

	 * code review fix

Author: rizwankhgl

lib/internal/Magento/Framework/Filter/Template.php

@@ -514,11 +514,6 @@ protected function getParameters($value)
         $tokenizer->setString($value);
         $params = $tokenizer->tokenize();
         foreach ($params as $key => $value) {
-            $validKey = strtolower($key);
-            if (strcmp($key, $validKey)) {
-                $params[$validKey] = $value;
-                unset($params[$key]);
-            }
             if ($value !== null && substr($value, 0, 1) === '$') {
                 $params[$key] = $this->getVariable(substr($value, 1), null);
             }

lib/internal/Magento/Framework/Filter/Template/Tokenizer/Parameter.php

@@ -25,7 +25,7 @@ public function tokenize()
             }
 
             if ($this->char() !== '=') {
-                $parameterName .= $this->char();
+                $parameterName .= strtolower($this->char());
             } else {
                 $parameters[$parameterName] = $this->getValue();
                 $parameterName = '';

lib/internal/Magento/Framework/View/Element/AbstractBlock.php

@@ -1043,10 +1043,18 @@ public function getCacheKeyInfo()
      * Get Key for caching block content
      *
      * @return string
+     * @throws \Magento\Framework\Exception\LocalizedException
      */
     public function getCacheKey()
     {
         if ($this->hasData('cache_key')) {
+            if (preg_match('/[^a-z0-9]/i', $this->getData('cache_key'))) {
+                throw new \Magento\Framework\Exception\LocalizedException(
+                    __(
+                        'Please enter cache key with only alphanumeric characters.'
+                    )
+                );
+            }
             return static::CUSTOM_CACHE_KEY_PREFIX . $this->getData('cache_key');
         }