/
errors.go
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/
errors.go
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// Copyright 2018 Google LLC
//
// 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
//
// https://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.
package util
import (
"fmt"
"log"
"net/http"
)
// TODO(twifkak): Change all functions to return error instead of *HTTPError,
// per https://golang.org/doc/faq#nil_error. Will need to convert LogAndRespond
// to a free function that takes an error and switches on type.
// HTTPError encodes an internal message to be logged and an HTTP status code
// to be used for the external error message. External errors should only be
// used to signal misconfiguration of the packager. For errors that are
// transient or a result of downstream server errors, the signer should fall
// back to proxying the content unsigned.
type HTTPError struct {
internalMsg string
statusCode int
}
func NewHTTPError(statusCode int, msg ...interface{}) *HTTPError {
return &HTTPError{fmt.Sprint(msg...), statusCode}
}
// Implements the error interface.
func (e *HTTPError) Error() string {
return e.internalMsg
}
func (e *HTTPError) LogAndRespond(resp http.ResponseWriter) {
log.Println(e.internalMsg)
resp.Header().Set("Cache-Control", "no-store")
http.Error(resp, http.StatusText(e.statusCode), e.statusCode)
}