Legacy format: save compilation on each call. GuessSessionID attempts to retrieve a session ID which may have been sent by the client. We only attempt to retrieve sessions using methods recognized for the given client.
(client Client, r *http.Request)
| 18 | // the client. We only attempt to retrieve sessions using methods recognized for |
| 19 | // the given client. |
| 20 | func GuessSessionID(client Client, r *http.Request) *string { |
| 21 | switch client { |
| 22 | case ClientClaudeCode: |
| 23 | // Prefer the dedicated header (added in Claude Code v2.1.86+). |
| 24 | if sid := cleanRef(r.Header.Get("X-Claude-Code-Session-Id")); sid != nil { |
| 25 | return sid |
| 26 | } |
| 27 | |
| 28 | // Fall back to extracting from the metadata.user_id field in the JSON body. |
| 29 | // Newer format: JSON-encoded object with a "session_id" field. |
| 30 | // Legacy format: "user_{sha256}_account_{id}_session_{uuid}" |
| 31 | payload, err := io.ReadAll(r.Body) |
| 32 | if err != nil { |
| 33 | return nil |
| 34 | } |
| 35 | _ = r.Body.Close() |
| 36 | |
| 37 | // Restore the request body. |
| 38 | r.Body = io.NopCloser(bytes.NewReader(payload)) |
| 39 | userID := gjson.GetBytes(payload, "metadata.user_id") |
| 40 | if userID.Type != gjson.String { |
| 41 | return nil |
| 42 | } |
| 43 | |
| 44 | raw := userID.String() |
| 45 | |
| 46 | // Newer body format: user_id is a JSON-encoded object with a session_id field. |
| 47 | if sessionID := gjson.Get(raw, "session_id"); sessionID.Exists() { |
| 48 | return cleanRef(sessionID.String()) |
| 49 | } |
| 50 | |
| 51 | // Legacy body format: "user_{sha256}_account_{id}_session_{uuid}" |
| 52 | matches := claudeCodePattern.FindStringSubmatch(raw) |
| 53 | if len(matches) < 2 { |
| 54 | return nil |
| 55 | } |
| 56 | return cleanRef(matches[1]) |
| 57 | case ClientCodex: |
| 58 | return cleanRef(r.Header.Get("session_id")) |
| 59 | case ClientMux: |
| 60 | return cleanRef(r.Header.Get("X-Mux-Workspace-Id")) |
| 61 | case ClientZed: |
| 62 | return nil // Zed does not send a session ID from Zed Agent or Text Thread. |
| 63 | case ClientCopilotVSC: |
| 64 | // This does not map precisely to what we consider a session, but it's close enough. |
| 65 | // Most other providers' equivalent of this would persist for the duration of a |
| 66 | // conversation; it does seem to persist across an agentic loop though, which is |
| 67 | // all we really need. |
| 68 | // |
| 69 | // There's also `vscode-sessionid` but that's persistent for the duration of the |
| 70 | // VS Code window. |
| 71 | return cleanRef(r.Header.Get("x-interaction-id")) |
| 72 | case ClientCopilotCLI: |
| 73 | return cleanRef(r.Header.Get("X-Client-Session-Id")) |
| 74 | case ClientKilo: |
| 75 | return cleanRef(r.Header.Get("X-KILOCODE-TASKID")) |
| 76 | case ClientCoderAgents: |
| 77 | return cleanRef(r.Header.Get("X-Coder-Chat-Id")) |