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handler.go
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/
handler.go
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/*
* Copyright 2018 The Trickster Authors
*
* 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 handler
import (
"net/http"
"strings"
"github.com/trickstercache/trickster/v2/pkg/encoding/profile"
"github.com/trickstercache/trickster/v2/pkg/encoding/providers"
"github.com/trickstercache/trickster/v2/pkg/proxy/headers"
strutil "github.com/trickstercache/trickster/v2/pkg/util/strings"
)
// HandleCompression wraps an HTTP response in a compression writer
// Compress types is a map[string]interface{} like: {"text/plain": nil, "application/json": nil}
// Any matching ContentType handled by the compression handler will be compressed
func HandleCompression(next http.Handler, compressTypes strutil.Lookup) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// if the client requested a No-Transform, then serve as-is
if strings.Contains(r.Header.Get(headers.NameCacheControl), headers.ValueNoTransform) {
next.ServeHTTP(w, r)
return
}
// setup the request's encoder profile to compress the provided content types
ep := &profile.Profile{
CompressTypes: compressTypes,
Level: -1,
}
// this checks the Client's accept-encoding header to identify any compatible encodings
enc := r.Header.Get(headers.NameAcceptEncoding)
ep.SupportedHeaderVal, ep.Supported = providers.GetCompatibleWebProviders(enc)
r = r.WithContext(profile.ToContext(r.Context(), ep))
// Set up the compression encoder here:
ew := NewEncoder(w, ep)
next.ServeHTTP(ew, r)
ew.Close()
})
}