yurkovoznyak opened a new issue, #13593:
URL: https://github.com/apache/apisix/issues/13593
### Current Behavior
In the official `apache/apisix:3.17.0-ubuntu` image, `cjson.empty_array` no
longer serializes to `[]`. It serializes to nothing, producing malformed JSON.
```lua
require("cjson").encode({ x = require("cjson").empty_array })
-- 3.17.0: {"x":} <-- malformed, value missing
-- expected: {"x":[]}
```
Root cause: 3.17.0 adds the `oas-validator` plugin, whose rockspec
dependency `lua-resty-openapi-validator = 1.0.5-1` declares an unpinned
`lua-cjson` dependency. `make deps` (luarocks) therefore installs **lua-cjson
2.1.0.10** into `/usr/local/apisix/deps/lib/lua/5.1/cjson.so`.
Any plugin (built-in or custom) that relies on the `cjson.empty_array`
sentinel to emit an empty JSON array is silently affected; the emitted body is
invalid JSON.
### Expected Behavior
`cjson.empty_array` encodes to `[]`, as it does with the OpenResty-bundled
lua-cjson 2.1.0.11. The image should not ship a transitive lua-cjson in `deps/`
that shadows (and regresses) the bundled one.
### Error Logs
No error is raised — this is the dangerous part. The encoder silently drops
the sentinel value, yielding malformed JSON
### Steps to Reproduce
1. Pull the official image: `docker pull apache/apisix:3.17.0-ubuntu`
2. Run the bundled OpenResty against the `deps/` cjson (what a worker loads):
```sh
docker run --rm --entrypoint /usr/local/openresty/bin/resty \
apache/apisix:3.17.0-ubuntu -e \
'package.cpath="/usr/local/apisix/deps/lib/lua/5.1/?.so;"..package.cpath
local c=require"cjson"
print(c._VERSION, c.encode({x=c.empty_array}))'
# => 2.1.0.10 {"x":} (expected: {"x":[]})
```
3. For contrast, force the bundled cjson:
```sh
docker run --rm --entrypoint /usr/local/openresty/bin/resty \
apache/apisix:3.17.0-ubuntu -e \
'package.cpath="/usr/local/openresty/lualib/?.so;"..package.cpath
local c=require"cjson"
print(c._VERSION, c.encode({x=c.empty_array}))'
# => 2.1.0.11 {"x":[]}
```
4. Confirm where it came from:
```sh
docker run --rm --entrypoint sh apache/apisix:3.17.0-ubuntu -c \
'find / -name "cjson*.so" 2>/dev/null'
# /usr/local/apisix/deps/lib/lua/5.1/cjson.so (2.1.0.10, luarocks)
# /usr/local/openresty/lualib/cjson.so (2.1.0.11, bundled)
```
`lua-resty-openapi-validator` is the rock that pulls lua-cjson into
`deps/`
(new in 3.17.0; absent in 3.16.0).
Note: `setmetatable({}, cjson.array_mt)` encodes to `[]` correctly in both
versions and is a viable workaround for plugin authors.
### Environment
- APISIX version: 3.17.0 (official `apache/apisix:3.17.0-ubuntu`, digest
`sha256:d7c01c5fc829e2f7375f8f7f2b02d29bb3d85f5069c327e61734c5bb8132a823`)
- Operating system: image is Ubuntu; reproduced on arm64 (cause is
arch-independent — the lua-cjson 2.1.0.10 rock is installed by luarocks
regardless of architecture)
- OpenResty / Nginx version: openresty/1.29.2.4
- etcd version: n/a
- LuaRocks: lua-cjson **2.1.0.10** installed in `deps/`, shadowing bundled
**2.1.0.11**; pulled in transitively by `lua-resty-openapi-validator = 1.0.5-1`
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