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error_template.go
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error_template.go
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// Copyright © 2021 The Things Network Foundation, The Things Industries B.V.
//
// 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.
package webhandlers
import (
_ "embed"
"encoding/json"
"html/template"
"net/http"
"time"
"go.thethings.network/lorawan-stack/v3/pkg/errors"
"go.thethings.network/lorawan-stack/v3/pkg/log"
)
// Data contains data to render templates.
type Data struct {
ErrorTitle string
ErrorMessage string
ErrorID string
CorrelationID string
BackendErrorDetails string
Year int
IsGenericNotFound bool
}
//go:embed "error_template.html.tmpl"
var errorTemplate string
// Template for rendering the static error.
var Template = func() *ErrorTemplate {
return NewErrorTemplate(template.Must(template.New("error").Parse(errorTemplate)))
}()
// ErrorTemplate wraps the error template for the static error route.
type ErrorTemplate struct {
template *template.Template
}
// NewErrorTemplate instantiates a new error template for non-frontend handled routes.
func NewErrorTemplate(t *template.Template) *ErrorTemplate {
return &ErrorTemplate{template: t}
}
// ServeHTTP renders the non-frontend handled errors.
func (t *ErrorTemplate) ServeHTTP(w http.ResponseWriter, r *http.Request) {
err := RetrieveError(r)
if err == nil {
return
}
errMsg, _ := json.MarshalIndent(err, "", " ")
errorID := "n/a"
errorCorrelationID := "n/a"
var errorTitle string
if ttnErr, ok := errors.From(err); ok {
errorID = ttnErr.FullName()
errorCorrelationID = ttnErr.CorrelationID()
errorTitle = ttnErr.FormatMessage(ttnErr.Attributes())
}
var errorMessage string
isGenericNotFound := errors.Resemble(err, errRouteNotFound)
switch errors.Code(err) {
case http.StatusNotFound:
if isGenericNotFound {
errorTitle = "Page not found"
}
errorMessage = "The resource you requested cannot be found."
case http.StatusUnauthorized:
errorMessage = "You are not allowed to perform this action."
default:
errorMessage = "An unknown error occurred."
}
if err := t.template.Execute(w, Data{
ErrorTitle: errorTitle,
ErrorMessage: errorMessage,
ErrorID: errorID,
CorrelationID: errorCorrelationID,
BackendErrorDetails: string(errMsg),
Year: time.Now().Year(),
IsGenericNotFound: isGenericNotFound,
}); err != nil {
log.FromContext(r.Context()).WithError(err).Warn("Failed to execute template")
}
}