zero: merge pomerium/zero-sdk (#4848)

pkg/zero/apierror/request_id.go

@@ -0,0 +1,42 @@
+package apierror
+
+import (
+	"fmt"
+	"net/http"
+)
+
+// RequestIDError is an error that wraps another error and includes the response ID
+type RequestIDError struct {
+	Err        error
+	ResponseID *string
+}
+
+// Error implements error for RequestIDError
+func (e *RequestIDError) Error() string {
+	if e.ResponseID == nil {
+		return e.Err.Error()
+	}
+	return fmt.Sprintf("[x-response-id:%s]: %v", *e.ResponseID, e.Err)
+}
+
+// Unwrap implements errors.Unwrap for RequestIDError
+func (e *RequestIDError) Unwrap() error {
+	return e.Err
+}
+
+// Is implements errors.Is for RequestIDError
+func (e *RequestIDError) Is(err error) bool {
+	//nolint:errorlint
+	_, ok := err.(*RequestIDError)
+	return ok
+}
+
+// WithRequestID creates a new RequestIDError
+func WithRequestID(err error, headers http.Header) *RequestIDError {
+	r := &RequestIDError{Err: err}
+	id := headers.Get("X-Response-Id")
+	if id != "" {
+		r.ResponseID = &id
+	}
+	return r
+}