fix(template): $proxy_add_forwarded not defined in reverse_proxy.conf

Author: 0xJacky

template/block/reverse_proxy.conf

@@ -26,6 +26,24 @@ map $http_upgrade $connection_upgrade {
     default upgrade;
     '' close;
 }
+map $remote_addr $proxy_forwarded_elem {
+    # IPv4 addresses can be sent as-is
+    ~^[0-9.]+$          "for=$remote_addr";
+
+    # IPv6 addresses need to be bracketed and quoted
+    ~^[0-9A-Fa-f:.]+$   "for=\"[$remote_addr]\"";
+
+    # Unix domain socket names cannot be represented in RFC 7239 syntax
+    default             "for=unknown";
+}
+
+map $http_forwarded $proxy_add_forwarded {
+    # If the incoming Forwarded header is syntactically valid, append to it
+    "~^(,[ \\t]*)*([!#$%&'*+.^_`|~0-9A-Za-z-]+=([!#$%&'*+.^_`|~0-9A-Za-z-]+|\"([\\t \\x21\\x23-\\x5B\\x5D-\\x7E\\x80-\\xFF]|\\\\[\\t \\x21-\\x7E\\x80-\\xFF])*\"))?(;([!#$%&'*+.^_`|~0-9A-Za-z-]+=([!#$%&'*+.^_`|~0-9A-Za-z-]+|\"([\\t \\x21\\x23-\\x5B\\x5D-\\x7E\\x80-\\xFF]|\\\\[\\t \\x21-\\x7E\\x80-\\xFF])*\"))?)*([ \\t]*,([ \\t]*([!#$%&'*+.^_`|~0-9A-Za-z-]+=([!#$%&'*+.^_`|~0-9A-Za-z-]+|\"([\\t \\x21\\x23-\\x5B\\x5D-\\x7E\\x80-\\xFF]|\\\\[\\t \\x21-\\x7E\\x80-\\xFF])*\"))?(;([!#$%&'*+.^_`|~0-9A-Za-z-]+=([!#$%&'*+.^_`|~0-9A-Za-z-]+|\"([\\t \\x21\\x23-\\x5B\\x5D-\\x7E\\x80-\\xFF]|\\\\[\\t \\x21-\\x7E\\x80-\\xFF])*\"))?)*)?)*$" "$http_forwarded, $proxy_forwarded_elem";
+
+    # Otherwise, replace it
+    default "$proxy_forwarded_elem";
+}
 {{- end }}
 # Nginx UI Custom End