Initial commit

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

common/imclient/errors.go

@@ -0,0 +1,41 @@
+package imclient
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+)
+
+const sessionExpiredCode = 401
+
+type APIError struct {
+	StatusCode int
+	Code       int
+	Message    string
+	Body       []byte
+}
+
+func (e *APIError) Error() string {
+	if e == nil {
+		return ""
+	}
+	if e.Code != 0 {
+		return fmt.Sprintf("im api error: status=%d code=%d message=%s", e.StatusCode, e.Code, e.Message)
+	}
+	return fmt.Sprintf("im api error: status=%d message=%s", e.StatusCode, e.Message)
+}
+
+func IsSessionExpired(err error) bool {
+	apiErr, ok := err.(*APIError)
+	if !ok || apiErr == nil {
+		return false
+	}
+	if apiErr.Code == sessionExpiredCode || apiErr.StatusCode == http.StatusUnauthorized {
+		return true
+	}
+	msg := strings.ToLower(apiErr.Message)
+	return strings.Contains(msg, "session has expired") ||
+		strings.Contains(msg, "log in again") ||
+		strings.Contains(msg, "token expired") ||
+		strings.Contains(msg, "token invalid")
+}