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error_handler.go
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error_handler.go
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// Copyright 2023 Dimitrij Drus <dadrus@gmx.de>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0
package errorhandler
import (
"errors"
"net/http"
"github.com/rs/zerolog"
"github.com/dadrus/heimdall/internal/accesscontext"
"github.com/dadrus/heimdall/internal/heimdall"
)
//go:generate mockery --name ErrorHandler --structname ErrorHandlerMock
type ErrorHandler interface {
HandleError(rw http.ResponseWriter, req *http.Request, err error)
}
func New(opts ...Option) ErrorHandler {
options := defaultOptions()
for _, opt := range opts {
opt(options)
}
return &errorHandler{opts: options}
}
type errorHandler struct {
*opts
}
func (h *errorHandler) HandleError(rw http.ResponseWriter, req *http.Request, err error) {
ctx := req.Context()
switch {
case errors.Is(err, heimdall.ErrAuthentication):
h.onAuthenticationError(rw, req, err)
case errors.Is(err, heimdall.ErrAuthorization):
h.onAuthorizationError(rw, req, err)
case errors.Is(err, heimdall.ErrCommunicationTimeout) || errors.Is(err, heimdall.ErrCommunication):
h.onCommunicationError(rw, req, err)
case errors.Is(err, heimdall.ErrArgument):
h.onPreconditionError(rw, req, err)
case errors.Is(err, heimdall.ErrMethodNotAllowed):
h.onBadMethodError(rw, req, err)
case errors.Is(err, heimdall.ErrNoRuleFound):
h.onNoRuleError(rw, req, err)
case errors.Is(err, &heimdall.RedirectError{}):
var redirectError *heimdall.RedirectError
errors.As(err, &redirectError)
rw.Header().Set("Location", redirectError.RedirectTo)
rw.WriteHeader(redirectError.Code)
return
default:
logger := zerolog.Ctx(ctx)
logger.Error().Err(err).Msg("Internal error occurred")
h.onInternalError(rw, req, err)
}
accesscontext.SetError(ctx, err)
}