[apisix] 16/18: fix: APISIX extended variables cannot be used in `_meta.filter` (#8256)

[sp...@apache.org]

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spacewander pushed a commit to branch release/2.15
in repository https://gitbox.apache.org/repos/asf/apisix.git

commit c020f0eb06e0d011eebc7564632286e9574c8834
Author: soulbird <zh...@outlook.com>
AuthorDate: Mon Nov 7 15:02:28 2022 +0800

    fix: APISIX extended variables cannot be used in `_meta.filter` (#8256)
    
    Co-authored-by: soulbird <zh...@gmail.com>
    Fixes https://github.com/apache/apisix/issues/8251
---
 apisix/plugin.lua |  2 +-
 t/plugin/plugin.t | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+), 1 deletion(-)

diff --git a/apisix/plugin.lua b/apisix/plugin.lua
index 511fbc605..7224e3492 100644
--- a/apisix/plugin.lua
+++ b/apisix/plugin.lua
@@ -425,7 +425,7 @@ local function meta_filter(ctx, plugin_name, plugin_conf)
                          " plugin_name: ", plugin_name)
         return true
     end
-    ok, err = ex:eval()
+    ok, err = ex:eval(ctx.var)
     if err then
         core.log.warn("failed to run the 'vars' expression: ", err,
                          " plugin_name: ", plugin_name)
diff --git a/t/plugin/plugin.t b/t/plugin/plugin.t
index 248688050..7ad45bc0d 100644
--- a/t/plugin/plugin.t
+++ b/t/plugin/plugin.t
@@ -735,3 +735,55 @@ passed
 GET /hello
 --- response_headers
 !x-version
+
+
+
+=== TEST 29: use APISIX's built-in variables in  meta.filter
+--- config
+    location /t {
+        content_by_lua_block {
+            local t = require("lib.test_admin").test
+            local code, body = t('/apisix/admin/routes/1',
+                ngx.HTTP_PUT,
+                {
+                    plugins = {
+                        ["proxy-rewrite"] = {
+                            _meta = {
+                                filter = {
+                                    {"post_arg_key", "==", "abc"}
+                                }
+                            },
+                            uri = "/echo",
+                            headers = {
+                                ["X-Api-Version"] = "ga"
+                            }
+                        }
+                    },
+                    upstream = {
+                        nodes = {
+                            ["127.0.0.1:1980"] = 1
+                        }
+                    },
+                    uri = "/hello"
+                }
+            )
+            if code >= 300 then
+                ngx.print(body)
+            else
+                ngx.say(body)
+            end
+        }
+    }
+--- response_body
+passed
+
+
+
+=== TEST 30: hit route: proxy-rewrite enable with post_arg_xx in meta.filter
+--- request
+POST /hello
+key=abc
+--- more_headers
+Content-Type: application/x-www-form-urlencoded
+--- response_headers
+x-api-version: ga