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Copy pathcompress.go
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Copy pathcompress.go
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217 lines (183 loc) · 4.41 KB
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package revel
import (
"compress/gzip"
"compress/zlib"
"io"
"net/http"
"strconv"
"strings"
)
var compressionTypes = [...]string{
"gzip",
"deflate",
}
var compressableMimes = [...]string{
"text/plain",
"text/html",
"text/xml",
"text/css",
"application/json",
"application/xml",
"application/xhtml+xml",
"application/rss+xml",
"application/javascript",
"application/x-javascript",
}
type WriteFlusher interface {
io.Writer
io.Closer
Flush() error
}
type CompressResponseWriter struct {
http.ResponseWriter
compressWriter WriteFlusher
compressionType string
headersWritten bool
parentNotify <-chan bool
closeNotify chan bool
closed bool
}
func CompressFilter(c *Controller, fc []Filter) {
if Config.BoolDefault("results.compressed", false) {
writer := CompressResponseWriter{c.Response.Out, nil, "", false, nil, make(chan bool, 1), false}
writer.DetectCompressionType(c.Request, c.Response)
w, ok := c.Response.Out.(http.CloseNotifier)
if ok {
writer.parentNotify = w.CloseNotify()
}
c.Response.Out = &writer
}
fc[0](c, fc[1:])
}
func (c *CompressResponseWriter) prepareHeaders() {
if c.compressionType != "" {
responseMime := c.Header().Get("Content-Type")
responseMime = strings.TrimSpace(strings.SplitN(responseMime, ";", 2)[0])
shouldEncode := false
if c.Header().Get("Content-Encoding") == "" {
for _, compressableMime := range compressableMimes {
if responseMime == compressableMime {
shouldEncode = true
c.Header().Set("Content-Encoding", c.compressionType)
c.Header().Del("Content-Length")
break
}
}
}
if !shouldEncode {
c.compressWriter = nil
c.compressionType = ""
}
}
}
func (c *CompressResponseWriter) WriteHeader(status int) {
c.headersWritten = true
c.prepareHeaders()
c.ResponseWriter.WriteHeader(status)
}
func (c *CompressResponseWriter) Write(b []byte) (int, error) {
// Abort if parent has been closed
if c.parentNotify != nil {
select {
case <-c.parentNotify:
return 0, io.ErrClosedPipe
default:
}
}
// Abort if we ourselves have been closed
if c.closed {
return 0, io.ErrClosedPipe
}
if !c.headersWritten {
c.prepareHeaders()
c.headersWritten = true
}
if c.compressionType != "" {
return c.compressWriter.Write(b)
}
return c.ResponseWriter.Write(b)
}
func (c *CompressResponseWriter) Close() error {
if c.compressionType == "" {
c.compressWriter.Close()
}
if w, ok := c.ResponseWriter.(io.Closer); ok {
w.Close()
}
// Non-blocking write to the closenotifier, if we for some reason should
// get called multiple times
select {
case c.closeNotify <- true:
default:
}
c.closed = true
return nil
}
func (c CompressResponseWriter) CloseNotify() <-chan bool {
if c.parentNotify != nil {
return c.parentNotify
}
return c.closeNotify
}
func (c *CompressResponseWriter) DetectCompressionType(req *Request, resp *Response) {
if Config.BoolDefault("results.compressed", false) {
acceptedEncodings := strings.Split(req.Request.Header.Get("Accept-Encoding"), ",")
largestQ := 0.0
chosenEncoding := len(compressionTypes)
for _, encoding := range acceptedEncodings {
encoding = strings.TrimSpace(encoding)
encodingParts := strings.SplitN(encoding, ";", 2)
// If we are the format "gzip;q=0.8"
if len(encodingParts) > 1 {
// Strip off the q=
num, err := strconv.ParseFloat(strings.TrimSpace(encodingParts[1])[2:], 32)
if err != nil {
continue
}
if num >= largestQ && num > 0 {
if encodingParts[0] == "*" {
chosenEncoding = 0
largestQ = num
continue
}
for i, encoding := range compressionTypes {
if encoding == encodingParts[0] {
if i < chosenEncoding {
largestQ = num
chosenEncoding = i
}
break
}
}
}
} else {
// If we can accept anything, chose our preferred method.
if encodingParts[0] == "*" {
chosenEncoding = 0
largestQ = 1
break
}
// This is for just plain "gzip"
for i, encoding := range compressionTypes {
if encoding == encodingParts[0] {
if i < chosenEncoding {
largestQ = 1.0
chosenEncoding = i
}
break
}
}
}
}
if largestQ == 0 {
return
}
c.compressionType = compressionTypes[chosenEncoding]
switch c.compressionType {
case "gzip":
c.compressWriter = gzip.NewWriter(resp.Out)
case "deflate":
c.compressWriter = zlib.NewWriter(resp.Out)
}
}
}