nic-6443 opened a new pull request, #13634:
URL: https://github.com/apache/apisix/pull/13634
### Description
`ai-prompt-guard` returns 500 when any inspected chat message has structured
`content`.
OpenAI Chat Completions allows `messages[].content` to be either a plain
string or an array of typed parts, e.g.:
```json
{ "role": "user", "content": [ { "type": "text", "text": "hello" } ] }
```
The plugin collected `msg.content` as-is and then called `table.concat`, so
an array element triggers:
```
ai-prompt-guard.lua: invalid value (table) at index N in table for 'concat'
```
and the request fails with a Lua runtime error. This is easy to hit with
`match_all_conversation_history` / `match_all_roles` enabled, since real
clients often send structured assistant/history messages.
The fix flattens each message's content before concatenation — strings pass
through, and the text parts of an array are extracted — mirroring how the
protocol adapters (`openai-chat`, `anthropic-messages`, etc.) already pull text
out of `content`. Non-text parts (e.g. `image_url`) are ignored, so there is
nothing to concat that isn't a string.
#### Which issue(s) this PR fixes:
Fixes #
### Checklist
- [x] I have explained the need for this PR and the problem it solves
- [x] I have explained the changes or the new features added to this PR
- [x] I have added tests corresponding to this change
- [ ] I have updated the documentation to reflect this change
- [x] I have verified that this change is backward compatible
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