Add support for page cache using Redis

Author: bogdanpetrea

php/docker/templates/nginx-vhost-conf.d/80-index.conf

@@ -1,12 +1,74 @@
 # vim: set ft=nginx:
 
+{{- $truthStrings := list "true" "on" "yes" }}
+
 location / {
     try_files $uri $uri/ /index.php$is_args$args;
 }
 
 location ~ \.php$ {
+    {{ if (has (default "off" .Env.PAGE_CACHE | lower) $truthStrings) }}
+    set $skip_cache 0;
+
+    # POST requests and urls with a query string should always go to PHP
+    if ($request_method = POST) {
+        set $skip_cache 1;
+    }
+    if ($query_string != "") {
+        set $skip_cache 1;
+    }
+
+    # Don't cache uris containing the following segments
+    if ($request_uri ~* "/wp-admin/|/xmlrpc.php|wp-.*.php|/feed/|index.php|sitemap(_index)?.xml") {
+        set $skip_cache 1;
+    }
+
+    # Don't use the cache for logged in users or recent commenters
+    if ($http_cookie ~* "comment_author|wordpress_[a-f0-9]+|wp-postpass|wordpress_no_cache|wordpress_logged_in") {
+        set $skip_cache 1;
+    }
+
+    set $key "nginx-cache:https$request_method$host$request_uri";
+    try_files $uri =404;
+
+    add_header X-my-header my-header-content;
+
+    srcache_fetch_skip $skip_cache;
+    srcache_store_skip $skip_cache;
+
+    srcache_response_cache_control off;
+
+    set_escape_uri $escaped_key $key;
+
+    srcache_fetch GET /redis-fetch $key;
+    srcache_store PUT /redis-store key=$escaped_key&exptime=120;
+
+    more_set_headers 'X-Cache $srcache_fetch_status';
+    more_set_headers 'X-Cache-2 $srcache_store_status';
+    {{ end }}
+
     fastcgi_pass   $upstream;
     fastcgi_read_timeout {{ max 60 (add 10 (default "30" .Env.PHP_REQUEST_TIMEOUT | atoi)) }};
     fastcgi_index  index.php;
     include        /usr/local/openresty/nginx/conf/fastcgi.conf;
 }
+
+{{ if (has (default "off" .Env.PAGE_CACHE | lower) $truthStrings) }}
+location /redis-fetch {
+    internal;
+
+    set $redis_key $args;
+    redis_pass {{ default "localhost:6379" .Env.PAGE_CACHE_REDIS_HOST_PATH }};
+}
+
+location /redis-store {
+    internal;
+
+    set_unescape_uri $exptime $arg_exptime;
+    set_unescape_uri $key $arg_key;
+
+    redis2_query set $key $echo_request_body;
+    redis2_query expire $key $exptime;
+    redis2_pass {{ default "localhost:6379" .Env.PAGE_CACHE_REDIS_HOST_PATH }};
+}
+{{ end }}