feat(libhttp): move into the Portainer repository EE-5475 (#10231)

pkg/libhttp/error/error.go

@@ -0,0 +1,46 @@
+// Package error provides error/logging functions that can be used in conjuction with http.Handler.
+package error
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+
+	"github.com/rs/zerolog/log"
+)
+
+type (
+	// LoggerHandler defines a HTTP handler that includes a HandlerError return pointer
+	LoggerHandler func(http.ResponseWriter, *http.Request) *HandlerError
+
+	errorResponse struct {
+		Message string `json:"message,omitempty"`
+		Details string `json:"details,omitempty"`
+	}
+)
+
+func (handler LoggerHandler) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
+	err := handler(rw, r)
+	if err != nil {
+		writeErrorResponse(rw, err)
+	}
+}
+
+func writeErrorResponse(rw http.ResponseWriter, err *HandlerError) {
+	if err.Err == nil {
+		err.Err = errors.New(err.Message)
+	}
+
+	log.Debug().CallerSkipFrame(2).Err(err.Err).Int("status_code", err.StatusCode).Str("msg", err.Message).Msg("HTTP error")
+
+	rw.Header().Set("Content-Type", "application/json")
+	rw.WriteHeader(err.StatusCode)
+
+	json.NewEncoder(rw).Encode(&errorResponse{Message: err.Message, Details: err.Err.Error()})
+}
+
+// WriteError is a convenience function that creates a new HandlerError before calling writeErrorResponse.
+// For use outside of the standard http handlers.
+func WriteError(rw http.ResponseWriter, code int, message string, err error) {
+	writeErrorResponse(rw, &HandlerError{code, message, err})
+}