Add cookie cache decider

Author: levidurfee

fixtures/index.php

@@ -1,5 +1,7 @@
 <?php
 
+setcookie('wordpress_logged_in_123123', 'abcdefg');
+
 header('x-test: testing');
 
 echo 'hi';

handlers/cookie.go

@@ -0,0 +1,27 @@
+package handlers
+
+import (
+	"net/http"
+	"regexp"
+
+	"github.com/golevi/cache-handler/config"
+)
+
+// Cookie compares the config cookie values against the ones sent by the request
+// and if one matches, we want to bypass the cache.
+func Cookie(c config.Config, w http.ResponseWriter, r *http.Request) bool {
+	// Loop through all the cookies from the request
+	for _, cookie := range r.Cookies() {
+		// Loop through all the regexp cookie names from the config
+		for _, cc := range c.Cookie {
+			// Compile the regexp
+			rge := regexp.MustCompile(cc)
+			// If we find a cookie, return true that we should bypass the cache.
+			if rge.Find([]byte(cookie.Name)) != nil {
+				return true
+			}
+		}
+	}
+
+	return false
+}

httpcache.go

@@ -258,6 +258,7 @@ func (c *Cache) Provision(ctx caddy.Context) error {
 
 	c.Deciders = append(c.Deciders, handlers.URI)
 	c.Deciders = append(c.Deciders, handlers.Method)
+	c.Deciders = append(c.Deciders, handlers.Cookie)
 
 	return nil
 }