[njs] Respecting writable attribute for property handlers.

[Dmitry Volyntsev]

details:   http://hg.nginx.org/njs/rev/ff2007772ec6
branches:  
changeset: 588:ff2007772ec6
user:      Dmitry Volyntsev <xeioex at nginx.com>
date:      Mon Aug 27 16:37:42 2018 +0300
description:
Respecting writable attribute for property handlers.

diffstat:

 njs/njs_vm.c             |  2 +-
 njs/test/njs_unit_test.c |  5 +----
 2 files changed, 2 insertions(+), 5 deletions(-)

diffs (27 lines):

diff -r 76cee25a8228 -r ff2007772ec6 njs/njs_vm.c
--- a/njs/njs_vm.c	Mon Aug 27 16:37:35 2018 +0300
+++ b/njs/njs_vm.c	Mon Aug 27 16:37:42 2018 +0300
@@ -656,7 +656,7 @@ njs_vmcode_property_set(njs_vm_t *vm, nj
     case NXT_OK:
         prop = pq.lhq.value;
 
-        if (prop->type == NJS_PROPERTY_HANDLER) {
+        if (prop->type == NJS_PROPERTY_HANDLER && prop->writable) {
             ret = prop->value.data.u.prop_handler(vm, object, value,
                                                   &vm->retval);
             if (nxt_slow_path(ret != NXT_OK)) {
diff -r 76cee25a8228 -r ff2007772ec6 njs/test/njs_unit_test.c
--- a/njs/test/njs_unit_test.c	Mon Aug 27 16:37:35 2018 +0300
+++ b/njs/test/njs_unit_test.c	Mon Aug 27 16:37:42 2018 +0300
@@ -6065,10 +6065,7 @@ static njs_unit_test_t  njs_test[] =
       nxt_string("true") },
 
     { nxt_string("({}).__proto__ = 1"),
-      nxt_string("1") },
-
-    { nxt_string("var o = {}; o.__proto__ = 1; o.__proto__"),
-      nxt_string("[object Object]") },
+      nxt_string("TypeError: Cannot assign to read-only property '__proto__' of object") },
 
     { nxt_string("({}).__proto__.constructor === Object"),
       nxt_string("true") },