Var: dynamic variables support.

This commit adds the variables $arg_NAME, $header_NAME, and $cookie_NAME.

src/nxt_http_variables.c

@@ -8,29 +8,47 @@
 
 
 static nxt_int_t nxt_http_var_method(nxt_task_t *task, nxt_str_t *str,
-    void *ctx);
+    void *ctx, uint16_t field);
 static nxt_int_t nxt_http_var_request_uri(nxt_task_t *task, nxt_str_t *str,
-    void *ctx);
-static nxt_int_t nxt_http_var_uri(nxt_task_t *task, nxt_str_t *str, void *ctx);
-static nxt_int_t nxt_http_var_host(nxt_task_t *task, nxt_str_t *str, void *ctx);
+    void *ctx, uint16_t field);
+static nxt_int_t nxt_http_var_uri(nxt_task_t *task, nxt_str_t *str, void *ctx,
+    uint16_t field);
+static nxt_int_t nxt_http_var_host(nxt_task_t *task, nxt_str_t *str, void *ctx,
+    uint16_t field);
+static nxt_int_t nxt_http_var_arg(nxt_task_t *task, nxt_str_t *str, void *ctx,
+    uint16_t field);
+static nxt_int_t nxt_http_var_header(nxt_task_t *task, nxt_str_t *str,
+    void *ctx, uint16_t field);
+static nxt_int_t nxt_http_var_cookie(nxt_task_t *task, nxt_str_t *str,
+    void *ctx, uint16_t field);
 
 
 static nxt_var_decl_t  nxt_http_vars[] = {
-    { nxt_string("method"),
-      &nxt_http_var_method,
-      0 },
-
-    { nxt_string("request_uri"),
-      &nxt_http_var_request_uri,
-      0 },
-
-    { nxt_string("uri"),
-      &nxt_http_var_uri,
-      0 },
-
-    { nxt_string("host"),
-      &nxt_http_var_host,
-      0 },
+    {
+        .name = nxt_string("method"),
+        .handler = nxt_http_var_method,
+    }, {
+        .name = nxt_string("request_uri"),
+        .handler = nxt_http_var_request_uri,
+    }, {
+        .name = nxt_string("uri"),
+        .handler = nxt_http_var_uri,
+    }, {
+        .name = nxt_string("host"),
+        .handler = nxt_http_var_host,
+    }, {
+        .name = nxt_string("arg"),
+        .handler = nxt_http_var_arg,
+        .field_hash = nxt_http_argument_hash,
+    }, {
+        .name = nxt_string("header"),
+        .handler = nxt_http_var_header,
+        .field_hash = nxt_http_header_hash,
+    }, {
+        .name = nxt_string("cookie"),
+        .handler = nxt_http_var_cookie,
+        .field_hash = nxt_http_cookie_hash,
+    },
 };
 
 
@@ -42,7 +60,7 @@ nxt_http_register_variables(void)
 
 
 static nxt_int_t
-nxt_http_var_method(nxt_task_t *task, nxt_str_t *str, void *ctx)
+nxt_http_var_method(nxt_task_t *task, nxt_str_t *str, void *ctx, uint16_t field)
 {
     nxt_http_request_t  *r;
 
@@ -55,7 +73,8 @@ nxt_http_var_method(nxt_task_t *task, nxt_str_t *str, void *ctx)
 
 
 static nxt_int_t
-nxt_http_var_request_uri(nxt_task_t *task, nxt_str_t *str, void *ctx)
+nxt_http_var_request_uri(nxt_task_t *task, nxt_str_t *str, void *ctx,
+    uint16_t field)
 {
     nxt_http_request_t  *r;
 
@@ -68,7 +87,7 @@ nxt_http_var_request_uri(nxt_task_t *task, nxt_str_t *str, void *ctx)
 
 
 static nxt_int_t
-nxt_http_var_uri(nxt_task_t *task, nxt_str_t *str, void *ctx)
+nxt_http_var_uri(nxt_task_t *task, nxt_str_t *str, void *ctx, uint16_t field)
 {
     nxt_http_request_t  *r;
 
@@ -81,7 +100,7 @@ nxt_http_var_uri(nxt_task_t *task, nxt_str_t *str, void *ctx)
 
 
 static nxt_int_t
-nxt_http_var_host(nxt_task_t *task, nxt_str_t *str, void *ctx)
+nxt_http_var_host(nxt_task_t *task, nxt_str_t *str, void *ctx, uint16_t field)
 {
     nxt_http_request_t  *r;
 
@@ -91,3 +110,125 @@ nxt_http_var_host(nxt_task_t *task, nxt_str_t *str, void *ctx)
 
     return NXT_OK;
 }
+
+
+static nxt_int_t
+nxt_http_var_arg(nxt_task_t *task, nxt_str_t *str, void *ctx, uint16_t field)
+{
+    nxt_array_t            *args;
+    nxt_var_field_t        *vf;
+    nxt_router_conf_t      *rtcf;
+    nxt_http_request_t     *r;
+    nxt_http_name_value_t  *nv, *start;
+
+    r = ctx;
+
+    rtcf = r->conf->socket_conf->router_conf;
+
+    vf = nxt_var_field_get(rtcf->var_fields, field);
+
+    args = nxt_http_arguments_parse(r);
+    if (nxt_slow_path(args == NULL)) {
+        return NXT_ERROR;
+    }
+
+    start = args->elts;
+    nv = start + args->nelts - 1;
+
+    while (nv >= start) {
+
+        if (vf->hash == nv->hash
+            && vf->name.length == nv->name_length
+            && nxt_memcmp(vf->name.start, nv->name, nv->name_length) == 0)
+        {
+            str->start = nv->value;
+            str->length = nv->value_length;
+
+            return NXT_OK;
+        }
+
+        nv--;
+    }
+
+    nxt_str_null(str);
+
+    return NXT_OK;
+}
+
+
+static nxt_int_t
+nxt_http_var_header(nxt_task_t *task, nxt_str_t *str, void *ctx, uint16_t field)
+{
+    nxt_var_field_t     *vf;
+    nxt_http_field_t    *f;
+    nxt_router_conf_t   *rtcf;
+    nxt_http_request_t  *r;
+
+    r = ctx;
+
+    rtcf = r->conf->socket_conf->router_conf;
+
+    vf = nxt_var_field_get(rtcf->var_fields, field);
+
+    nxt_list_each(f, r->fields) {
+
+        if (vf->hash == f->hash
+            && vf->name.length == f->name_length
+            && nxt_strncasecmp(vf->name.start, f->name, f->name_length) == 0)
+        {
+            str->start = f->value;
+            str->length = f->value_length;
+
+            return NXT_OK;
+        }
+
+    } nxt_list_loop;
+
+    nxt_str_null(str);
+
+    return NXT_OK;
+}
+
+
+static nxt_int_t
+nxt_http_var_cookie(nxt_task_t *task, nxt_str_t *str, void *ctx, uint16_t field)
+{
+    nxt_array_t            *cookies;
+    nxt_var_field_t        *vf;
+    nxt_router_conf_t      *rtcf;
+    nxt_http_request_t     *r;
+    nxt_http_name_value_t  *nv, *end;
+
+    r = ctx;
+
+    rtcf = r->conf->socket_conf->router_conf;
+
+    vf = nxt_var_field_get(rtcf->var_fields, field);
+
+    cookies = nxt_http_cookies_parse(r);
+    if (nxt_slow_path(cookies == NULL)) {
+        return NXT_ERROR;
+    }
+
+    nv = cookies->elts;
+    end = nv + cookies->nelts;
+
+    while (nv < end) {
+
+        if (vf->hash == nv->hash
+            && vf->name.length == nv->name_length
+            && nxt_memcmp(vf->name.start, nv->name, nv->name_length) == 0)
+        {
+            str->start = nv->value;
+            str->length = nv->value_length;
+
+            return NXT_OK;
+        }
+
+        nv++;
+    }
+
+    nxt_str_null(str);
+
+    return NXT_OK;
+}