137 lines
3.3 KiB
Go
137 lines
3.3 KiB
Go
package handlers
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import (
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"context"
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"html/template"
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"net/http"
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"path"
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"github.com/nicksnyder/go-i18n/v2/i18n"
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log "github.com/sirupsen/logrus"
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commonServices "git.cacert.org/oidc_login/common/services"
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)
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type errorKey int
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const (
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errorBucketKey errorKey = iota
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)
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type ErrorDetails struct {
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ErrorMessage string
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ErrorDetails []string
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ErrorCode string
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Error error
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}
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type ErrorBucket struct {
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errorDetails *ErrorDetails
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templates *template.Template
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logger *log.Logger
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bundle *i18n.Bundle
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messageCatalog *commonServices.MessageCatalog
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}
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func (b *ErrorBucket) serveHTTP(w http.ResponseWriter, r *http.Request) {
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if b.errorDetails != nil {
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accept := r.Header.Get("Accept-Language")
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localizer := i18n.NewLocalizer(b.bundle, accept)
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err := b.templates.Lookup("base").Execute(w, map[string]interface{}{
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"Title": b.messageCatalog.LookupMessage(
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"ErrorTitle",
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nil,
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localizer,
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),
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"details": b.errorDetails,
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})
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if err != nil {
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log.Errorf("error rendering error template: %v", err)
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http.Error(
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w,
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http.StatusText(http.StatusInternalServerError),
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http.StatusInternalServerError,
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)
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}
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}
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}
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func GetErrorBucket(r *http.Request) *ErrorBucket {
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return r.Context().Value(errorBucketKey).(*ErrorBucket)
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}
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// call this from your application's handler
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func (b *ErrorBucket) AddError(details *ErrorDetails) {
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b.errorDetails = details
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}
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type errorResponseWriter struct {
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http.ResponseWriter
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ctx context.Context
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statusCode int
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}
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func (w *errorResponseWriter) WriteHeader(code int) {
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w.statusCode = code
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if code >= 400 {
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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errorBucket := w.ctx.Value(errorBucketKey).(*ErrorBucket)
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if errorBucket != nil && errorBucket.errorDetails == nil {
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errorBucket.AddError(&ErrorDetails{
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ErrorMessage: http.StatusText(code),
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})
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}
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}
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w.ResponseWriter.WriteHeader(code)
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}
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func (w *errorResponseWriter) Write(content []byte) (int, error) {
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if w.statusCode > 400 {
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errorBucket := w.ctx.Value(errorBucketKey).(*ErrorBucket)
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if errorBucket != nil {
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if errorBucket.errorDetails.ErrorDetails == nil {
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errorBucket.errorDetails.ErrorDetails = make([]string, 0)
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}
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errorBucket.errorDetails.ErrorDetails = append(
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errorBucket.errorDetails.ErrorDetails, string(content),
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)
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return len(content), nil
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}
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}
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return w.ResponseWriter.Write(content)
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}
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func ErrorHandling(
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handlerContext context.Context,
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logger *log.Logger,
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templateBaseDir string,
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) (func(http.Handler) http.Handler, error) {
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errorTemplates, err := template.ParseFiles(
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path.Join(templateBaseDir, "base.gohtml"),
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path.Join(templateBaseDir, "errors.gohtml"),
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)
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if err != nil {
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return nil, err
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}
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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errorBucket := &ErrorBucket{
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templates: errorTemplates,
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logger: logger,
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bundle: commonServices.GetI18nBundle(handlerContext),
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messageCatalog: commonServices.GetMessageCatalog(handlerContext),
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}
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ctx := context.WithValue(r.Context(), errorBucketKey, errorBucket)
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interCeptingResponseWriter := &errorResponseWriter{
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w,
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ctx,
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http.StatusOK,
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}
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next.ServeHTTP(
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interCeptingResponseWriter,
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r.WithContext(ctx),
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)
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errorBucket.serveHTTP(w, r)
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})
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}, nil
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}
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