Files
coder/aibridge/client.go
Danny Kopping 8aa3294f06 fix(aibridge): track Charm Crush client and session ID (#24630)
*Disclaimer: implemented by a Coder Agent using Claude Opus 4.6*

Porting https://github.com/coder/aibridge/pull/277 to coder/coder after
the [aibridge code move](https://github.com/coder/coder/pull/24190).

## Summary

Fixes client detection and session ID tracking for the [Charm
Crush](https://github.com/charmbracelet/crush) AI coding client.

## Changes

### Bug fix: User-Agent matching

The actual Crush user-agent is `Charm-Crush/{version}
(https://charm.land/crush)` (hyphenated), but `GuessClient` only checked
for `charm crush/` (space-separated). After lowercasing,
`Charm-Crush/0.2.0` becomes `charm-crush/0.2.0`, which did not match the
`charm crush/` prefix.

Now matches both formats for backwards compatibility.

### Session ID tracking

Adds an explicit `ClientCrush` case to `GuessSessionID`. Crush does not
currently send a session ID header to upstream AI providers, so this
returns `nil` (consistent with how `ClientZed`, `ClientRoo`, and
`ClientCursor` are handled).

### Tests

- Added `charm_crush_hyphen` test case for `GuessClient` using the real
user-agent format.
- Added `crush_returns_empty` test case for `GuessSessionID`.
2026-04-22 19:02:31 +02:00

61 lines
2.3 KiB
Go

package aibridge
import (
"net/http"
"strings"
)
type Client string
const (
// Possible values for the "client" field in interception records.
// Must be kept in sync with documentation: https://github.com/coder/coder/blob/90c11f3386578da053ec5cd9f1475835b980e7c7/docs/ai-coder/ai-bridge/monitoring.md?plain=1#L36-L44
ClientClaudeCode Client = "Claude Code"
ClientCodex Client = "Codex"
ClientZed Client = "Zed"
ClientCopilotVSC Client = "GitHub Copilot (VS Code)"
ClientCopilotCLI Client = "GitHub Copilot (CLI)"
ClientKilo Client = "Kilo Code"
ClientCoderAgents Client = "Coder Agents"
ClientCrush Client = "Charm Crush"
ClientMux Client = "Mux"
ClientRoo Client = "Roo Code"
ClientCursor Client = "Cursor"
ClientUnknown Client = "Unknown"
)
// GuessClient attempts to guess the client application from the request headers.
// Not all clients set proper user agent headers, so this is a best-effort approach.
// Based on https://github.com/coder/aibridge/issues/20#issuecomment-3769444101.
func GuessClient(r *http.Request) Client {
userAgent := strings.ToLower(r.UserAgent())
originator := r.Header.Get("originator")
// Must be kept in sync with documentation: https://github.com/coder/coder/blob/90c11f3386578da053ec5cd9f1475835b980e7c7/docs/ai-coder/ai-bridge/monitoring.md?plain=1#L36-L44
switch {
case strings.HasPrefix(userAgent, "mux/"):
return ClientMux
case strings.HasPrefix(userAgent, "claude"):
return ClientClaudeCode
case strings.HasPrefix(userAgent, "codex"):
return ClientCodex
case strings.HasPrefix(userAgent, "zed/"):
return ClientZed
case strings.HasPrefix(userAgent, "githubcopilotchat/"):
return ClientCopilotVSC
case strings.HasPrefix(userAgent, "copilot/"):
return ClientCopilotCLI
case strings.HasPrefix(userAgent, "kilo-code/") || originator == "kilo-code":
return ClientKilo
case strings.HasPrefix(userAgent, "roo-code/") || originator == "roo-code":
return ClientRoo
case strings.HasPrefix(userAgent, "coder-agents/"):
return ClientCoderAgents
case strings.HasPrefix(userAgent, "charm crush/") || strings.HasPrefix(userAgent, "charm-crush/"):
return ClientCrush
case r.Header.Get("x-cursor-client-version") != "":
return ClientCursor
}
return ClientUnknown
}