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cea4780cb3## Summary
Image uploads delivered through the `aws_bedrock_converse` LLM provider
were rejected by Bedrock with `Could not process image` whenever an
agent / LLM had `vision_enabled` set to true.
Two related bugs are fixed:
### 1. `Dialects::Converse#upload_node` — base64 string passed where raw
bytes expected
In `plugins/discourse-ai/lib/completions/dialects/converse.rb`, image
content was emitted as:
```ruby
source: { bytes: details[:base64] }
```
`details[:base64]` is the upload's base64-encoded string (as produced by
`UploadEncoder`), but `Aws::BedrockRuntime::Client#converse` expects
**raw bytes** on the `:bytes` key — the SDK then base64-encodes them on
the wire. Passing the already-base64-encoded string causes Bedrock to
receive **doubly-encoded** data, which it cannot decode into a valid
image. Decoding back to raw bytes via
`Base64.decode64(details[:base64])` resolves the round-trip.
### 2. `AwsBedrockConverse#perform_completion!` — JSON-logging fails on
binary payloads
With raw bytes now flowing through `sdk_params`, the subsequent
`sdk_params.to_json` call (used to record the request in `start_log`)
raises `EncodingError` because PNG/JPEG bytes are not valid UTF-8. The
call is wrapped in `begin / rescue EncodingError` so the request can
still proceed; a placeholder string is recorded in the audit log instead
of the binary payload.
## Test plan
- A new spec case in
`plugins/discourse-ai/spec/lib/completions/dialects/converse_spec.rb`
asserts that `details[:base64]` is decoded back to raw bytes before
being emitted as `source: { bytes: ... }`. This guards against
regression.
- Verified end-to-end against `us.anthropic.claude-sonnet-4-6` via
Bedrock Converse on `ap-northeast-1` → `us-east-1` cross-region
inference profile: with this patch the model correctly describes
uploaded PNG attachments (a Loupe Browser version warning dialog)
instead of returning `Could not process image`.
## Reproduction (before the fix)
1. Configure an `aws_bedrock_converse` LLM in Discourse and assign it to
an `AiAgent` with `vision_enabled: true`.
2. Wire up `llm_triage` (or any path that goes through
`Dialects::Converse#upload_node`) to reply to a topic that contains an
image upload.
3. Observe:
`DiscourseAi::Completions::Endpoints::Base::CompletionFailed: The model
returned the following errors: Could not process image`
## Discovered while
Standing up a Discourse instance with Bedrock-backed AI as part of an
internal forum spike. Happy to iterate on the patch (e.g. tighten the
log fallback or extract a helper) if reviewers prefer a different shape.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Co-authored-by: Rafael Silva <xfalcox@gmail.com>
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|---|---|---|
| .. | ||
| chat_gpt.rb | ||
| claude.rb | ||
| claude_tools.rb | ||
| cohere_tools.rb | ||
| command.rb | ||
| converse.rb | ||
| converse_tools.rb | ||
| dialect.rb | ||
| fake.rb | ||
| gemini.rb | ||
| mistral.rb | ||
| nova.rb | ||
| nova_tools.rb | ||
| ollama.rb | ||
| ollama_tools.rb | ||
| open_ai_compatible.rb | ||
| open_ai_responses.rb | ||
| open_ai_tools.rb | ||
| xml_tools.rb | ||
