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unchunked.go
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unchunked.go
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/*
Copyright (C) 2017 Kagucho <kagucho.net@gmail.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// Package unchunked implements an unchunked response writer wrapper.
package unchunked
import (
"compress/gzip"
"net/http"
)
// Unchunked is a structure which implements an unchunked http.ResponseWriter.
type Unchunked struct {
handle http.HandlerFunc
}
// New returns a new unchunked.Unchunked.
func New(handle http.HandlerFunc) Unchunked {
return Unchunked{handle}
}
// ServeHTTP serves an unchunked response.
func (unchunked Unchunked) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
var gzipEncode bool
if accepted, present := request.Header[`Accept-Encoding`]; present {
const unsetGzipQ = 2 << qInitIndex
gzipQ := uint(unsetGzipQ)
identityQ := uint(0)
parse(accepted, func(coding codingIndex, q uint) {
switch coding {
case codingAny:
if gzipQ == unsetGzipQ {
gzipQ = q
}
case codingGzip:
gzipQ = q
case codingIdentity:
identityQ = q
}
})
gzipEncode = gzipQ >= identityQ &&
gzipQ > 0 && gzipQ != unsetGzipQ
} else {
gzipEncode = true
}
commonWriter := unchunkedResponseWriter{
writer, &unchunkedResponseWriterState{code: http.StatusOK},
}
if gzipEncode {
writer.Header().Set(`Content-Encoding`, `gzip`)
gzipWriter := gzipUnchunkedResponseWriter{
unchunkedResponseWriter: commonWriter,
}
var err error
gzipWriter.gzip, err = gzip.NewWriterLevel(
&gzipWriter.unchunkedResponseWriter.state.buffer,
gzip.BestCompression)
if err != nil {
panic(err)
}
unchunked.handle(gzipWriter, request)
gzipWriter.finalize()
} else {
identityWriter := identityUnchunkedResponseWriter{commonWriter}
unchunked.handle(identityWriter, request)
identityWriter.finalize()
}
}