From 4096676897ba547079e96230a16587150835d356 Mon Sep 17 00:00:00 2001
From: Vladimir Homutov <vl@nginx.com>
Date: Fri, 20 Mar 2020 12:44:45 +0300
Subject: [PATCH] Adedd the http "quic" variable.

The value is literal "quic" for requests passed over HTTP/3, and empty string
otherwise.
---
 src/http/v3/ngx_http_v3_module.c | 53 +++++++++++++++++++++++++++++++-
 1 file changed, 52 insertions(+), 1 deletion(-)

diff --git a/src/http/v3/ngx_http_v3_module.c b/src/http/v3/ngx_http_v3_module.c
index 6d3f34d41..20137b377 100644
--- a/src/http/v3/ngx_http_v3_module.c
+++ b/src/http/v3/ngx_http_v3_module.c
@@ -100,13 +100,16 @@ static ngx_command_t  ngx_http_v3_commands[] = {
 };
 
 
+static ngx_int_t ngx_http_variable_quic(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data);
+static ngx_int_t ngx_http_v3_add_variables(ngx_conf_t *cf);
 static void *ngx_http_v3_create_srv_conf(ngx_conf_t *cf);
 static char *ngx_http_v3_merge_srv_conf(ngx_conf_t *cf,
     void *parent, void *child);
 
 
 static ngx_http_module_t  ngx_http_v3_module_ctx = {
-    NULL,                                  /* preconfiguration */
+    ngx_http_v3_add_variables,             /* preconfiguration */
     NULL,                                  /* postconfiguration */
 
     NULL,                                  /* create main configuration */
@@ -136,6 +139,54 @@ ngx_module_t  ngx_http_v3_module = {
 };
 
 
+static ngx_http_variable_t  ngx_http_v3_vars[] = {
+    { ngx_string("quic"), NULL, ngx_http_variable_quic,
+      0, 0, 0 },
+
+      ngx_http_null_variable
+};
+
+
+static ngx_int_t
+ngx_http_variable_quic(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data)
+{
+    if (r->connection->qs) {
+
+        v->len = 4;
+        v->valid = 1;
+        v->no_cacheable = 1;
+        v->not_found = 0;
+        v->data = (u_char *) "quic";
+        return NGX_OK;
+    }
+
+    v->not_found = 1;
+
+    return NGX_OK;
+}
+
+
+static ngx_int_t
+ngx_http_v3_add_variables(ngx_conf_t *cf)
+{
+    ngx_http_variable_t  *var, *v;
+
+    for (v = ngx_http_v3_vars; v->name.len; v++) {
+        var = ngx_http_add_variable(cf, &v->name, v->flags);
+        if (var == NULL) {
+            return NGX_ERROR;
+        }
+
+        var->get_handler = v->get_handler;
+        var->data = v->data;
+    }
+
+    return NGX_OK;
+}
+
+
+
 static void *
 ngx_http_v3_create_srv_conf(ngx_conf_t *cf)
 {