Agent communication protocol (#9175)

* Agent communication protocol

Add brotli compression support
Add accepted encodings
Add common headers for agent
Use common headers on inventory requests
Work with new protocol

Author: trasher

.composer-require-checker.config.json

@@ -62,7 +62,11 @@
     "sodium_crypto_aead_chacha20poly1305_ietf_keygen", "SODIUM_CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NPUBBYTES", "sodium_crypto_aead_xchacha20poly1305_ietf_encrypt", "sodium_crypto_aead_xchacha20poly1305_ietf_decrypt",
 
     "//xhprof",
-    "XHPROF_FLAGS_NO_BUILTINS", "XHPROF_FLAGS_CPU", "XHPROF_FLAGS_MEMORY"
+    "XHPROF_FLAGS_NO_BUILTINS", "XHPROF_FLAGS_CPU", "XHPROF_FLAGS_MEMORY",
+
+    "//brotli compression",
+    "brotli_uncompress",
+    "brotli_compress"
   ],
   "scan-files": [
     "ajax/**/*.php",

front/inventory.php

@@ -35,7 +35,7 @@
 include ('../inc/includes.php');
 
 $inventory_request = new Request();
-
+$inventory_request->handleHeaders();
 
 $handle = true;
 if (isset($_GET['refused'])) {
@@ -61,10 +61,10 @@
    $redirect_url = $refused->handleInventoryRequest($inventory_request);
    Html::redirect($redirect_url);
 } else {
-   header('Content-Type: ' . $inventory_request->getContentType());
-   header('Cache-Control: no-cache,no-store');
-   header('Pragma: no-cache');
-   header('Connection: close');
-
+   $headers = $inventory_request->getHeaders(true);
+   http_response_code($inventory_request->getHttpResponseCode());
+   foreach ($headers as $key => $value) {
+      header(sprintf('%1$s: %2$s', $key, $value));
+   }
    echo $inventory_request->getResponse();
 }