## Summary
Ports five Python agent APIs to Go under the v1 Gin router:
- `GET /api/v1/agents/attachments/<attachment_id>/download`
- `POST /api/v1/chatbots/<dialog_id>/completions` (SSE)
- `GET /api/v1/chatbots/<dialog_id>/info`
- `POST /api/v1/agentbots/<agent_id>/completions` (SSE)
- `GET /api/v1/agentbots/<agent_id>/inputs`
Mirrors the existing Python wire shape (`{code, message,
data:{answer,reference,...}}` per Python `canvas_service.completion`) so
the iframe SDK and existing JS widgets keep working.
## Behavioural parity with Python
| # | Concern | How it's met |
|---|---------|--------------|
| R0 | Bot routes must not require regular user session | Routes mount
on `apiNoAuth` (router.go:198-202), with `BetaAuthMiddleware` only |
| R3 | Two SSE formats in Go drift | F2: `AgentChatCompletions` and
`AgentbotCompletion` share `service.WriteChatbotRunEvent` |
| R7 | `GetBySessionID` returns `(nil, nil)` on miss | Defensive
nil-check before `session.UserID != tenantID` |
| R8 | Begin component name vs ID | `FindBeginComponentID` resolves name
→ ID first, then `ExtractComponentInputForm(dsl, beginID)` |
| R9 | Defensive PromptConfig parsing | `stringFromMap` helper used for
`prologue` and `tavily_api_key` |
| R10 | `BetaAuthMiddleware` Bearer-prefix pre-filter | Removed —
`GetUserByToken` is called unconditionally, falls back to
`GetUserByBetaAPIToken` |
| F8 | Multi-turn chatbot history | `ChatbotCompletion` reads prior
turns from `session.Message`, appends user turn, calls LLM, persists new
pair via new `API4ConversationDAO.Update` |
| F9 | UUID gate stricter than plan | Removed — only `filepath.Base` +
CR/LF/quote header sanitization remains |
| H2 | Defence-in-depth IDOR | `AgentbotCompletion` calls `loadCanvas`
before delegating to `RunAgent` |
| M2 | SSE error leakage | `WriteChatbotFrame` emits generic `"an
internal error occurred"`; real error logged via `common.Error` |
## Verification
```bash
$ go vet ./... # clean (only pre-existing issues)
$ go build ./... # success
$ go test ./internal/handler/ ./internal/service/ ./internal/agent/dsl/ ./internal/common/ ./internal/dao/
ok ragflow/internal/handler 0.617s
ok ragflow/internal/service 1.729s
ok ragflow/internal/agent/dsl 0.008s
ok ragflow/internal/common 0.087s
ok ragflow/internal/dao 0.083s
```
1199 tests pass across 5 packages.
## Known follow-ups (out of scope for this PR)
- **F1**: token-level streaming in `ChatbotCompletion` (currently emits
one frame per turn)
- **F3**: per-route `auth_types` attribute in Go (currently applied via
route group middleware)
---------
Co-authored-by: Claude <noreply@anthropic.com>
