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service_mw.go
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service_mw.go
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// Copyright 2015-present, Cyrill @ Schumacher.fm and the CoreStore contributors
//
// 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 cors
import (
"net/http"
"github.com/corestoreio/errors"
"github.com/corestoreio/log"
loghttp "github.com/corestoreio/log/http"
)
// WithCORS to be used as a middleware. This middleware expects to find a
// scope.FromContext().
func (s *Service) WithCORS(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
scpCfg, err := s.configByContext(r.Context())
if err != nil {
s.Log.Info("cors.Service.WithCORS.configByContext.Error", log.Err(err))
if s.Log.IsDebug() {
s.Log.Debug("cors.Service.WithCORS.configByContext", log.Err(err), loghttp.Request("request", r))
}
s.ErrorHandler(errors.Wrap(err, "cors.Service.WithCORS.configFromContext")).ServeHTTP(w, r)
return
}
if s.Log.IsInfo() {
s.Log.Info("cors.Service.WithCORS.handleActualRequest", log.String("method", r.Method), log.Object("scopedConfig", scpCfg))
}
if r.Method == methodOptions {
if s.Log.IsDebug() {
s.Log.Debug("cors.Service.WithCORS.handlePreflight", log.String("method", r.Method), log.Bool("OptionsPassthrough", scpCfg.OptionsPassthrough))
}
scpCfg.handlePreflight(w, r)
// Preflight requests are standalone and should stop the chain as
// some other middleware may not handle OPTIONS requests correctly.
// One typical example is authentication middleware ; OPTIONS
// requests won't carry authentication headers (see #1)
if scpCfg.OptionsPassthrough {
next.ServeHTTP(w, r)
}
return
}
scpCfg.handleActualRequest(w, r)
next.ServeHTTP(w, r)
})
}