mirror of
https://github.com/go-gitea/gitea.git
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533 lines
16 KiB
Go
533 lines
16 KiB
Go
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package gziphandler // import "github.com/NYTimes/gziphandler"
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import (
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"bufio"
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"compress/gzip"
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"fmt"
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"io"
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"mime"
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"net"
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"net/http"
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"strconv"
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"strings"
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"sync"
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)
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const (
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vary = "Vary"
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acceptEncoding = "Accept-Encoding"
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contentEncoding = "Content-Encoding"
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contentType = "Content-Type"
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contentLength = "Content-Length"
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)
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type codings map[string]float64
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const (
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// DefaultQValue is the default qvalue to assign to an encoding if no explicit qvalue is set.
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// This is actually kind of ambiguous in RFC 2616, so hopefully it's correct.
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// The examples seem to indicate that it is.
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DefaultQValue = 1.0
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// DefaultMinSize is the default minimum size until we enable gzip compression.
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// 1500 bytes is the MTU size for the internet since that is the largest size allowed at the network layer.
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// If you take a file that is 1300 bytes and compress it to 800 bytes, it’s still transmitted in that same 1500 byte packet regardless, so you’ve gained nothing.
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// That being the case, you should restrict the gzip compression to files with a size greater than a single packet, 1400 bytes (1.4KB) is a safe value.
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DefaultMinSize = 1400
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)
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// gzipWriterPools stores a sync.Pool for each compression level for reuse of
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// gzip.Writers. Use poolIndex to covert a compression level to an index into
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// gzipWriterPools.
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var gzipWriterPools [gzip.BestCompression - gzip.BestSpeed + 2]*sync.Pool
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func init() {
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for i := gzip.BestSpeed; i <= gzip.BestCompression; i++ {
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addLevelPool(i)
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}
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addLevelPool(gzip.DefaultCompression)
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}
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// poolIndex maps a compression level to its index into gzipWriterPools. It
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// assumes that level is a valid gzip compression level.
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func poolIndex(level int) int {
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// gzip.DefaultCompression == -1, so we need to treat it special.
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if level == gzip.DefaultCompression {
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return gzip.BestCompression - gzip.BestSpeed + 1
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}
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return level - gzip.BestSpeed
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}
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func addLevelPool(level int) {
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gzipWriterPools[poolIndex(level)] = &sync.Pool{
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New: func() interface{} {
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// NewWriterLevel only returns error on a bad level, we are guaranteeing
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// that this will be a valid level so it is okay to ignore the returned
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// error.
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w, _ := gzip.NewWriterLevel(nil, level)
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return w
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},
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}
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}
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// GzipResponseWriter provides an http.ResponseWriter interface, which gzips
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// bytes before writing them to the underlying response. This doesn't close the
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// writers, so don't forget to do that.
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// It can be configured to skip response smaller than minSize.
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type GzipResponseWriter struct {
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http.ResponseWriter
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index int // Index for gzipWriterPools.
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gw *gzip.Writer
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code int // Saves the WriteHeader value.
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minSize int // Specifed the minimum response size to gzip. If the response length is bigger than this value, it is compressed.
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buf []byte // Holds the first part of the write before reaching the minSize or the end of the write.
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ignore bool // If true, then we immediately passthru writes to the underlying ResponseWriter.
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contentTypes []parsedContentType // Only compress if the response is one of these content-types. All are accepted if empty.
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}
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type GzipResponseWriterWithCloseNotify struct {
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*GzipResponseWriter
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}
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func (w GzipResponseWriterWithCloseNotify) CloseNotify() <-chan bool {
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return w.ResponseWriter.(http.CloseNotifier).CloseNotify()
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}
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// Write appends data to the gzip writer.
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func (w *GzipResponseWriter) Write(b []byte) (int, error) {
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// GZIP responseWriter is initialized. Use the GZIP responseWriter.
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if w.gw != nil {
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return w.gw.Write(b)
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}
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// If we have already decided not to use GZIP, immediately passthrough.
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if w.ignore {
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return w.ResponseWriter.Write(b)
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}
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// Save the write into a buffer for later use in GZIP responseWriter (if content is long enough) or at close with regular responseWriter.
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// On the first write, w.buf changes from nil to a valid slice
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w.buf = append(w.buf, b...)
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var (
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cl, _ = strconv.Atoi(w.Header().Get(contentLength))
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ct = w.Header().Get(contentType)
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ce = w.Header().Get(contentEncoding)
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)
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// Only continue if they didn't already choose an encoding or a known unhandled content length or type.
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if ce == "" && (cl == 0 || cl >= w.minSize) && (ct == "" || handleContentType(w.contentTypes, ct)) {
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// If the current buffer is less than minSize and a Content-Length isn't set, then wait until we have more data.
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if len(w.buf) < w.minSize && cl == 0 {
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return len(b), nil
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}
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// If the Content-Length is larger than minSize or the current buffer is larger than minSize, then continue.
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if cl >= w.minSize || len(w.buf) >= w.minSize {
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// If a Content-Type wasn't specified, infer it from the current buffer.
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if ct == "" {
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ct = http.DetectContentType(w.buf)
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w.Header().Set(contentType, ct)
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}
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// If the Content-Type is acceptable to GZIP, initialize the GZIP writer.
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if handleContentType(w.contentTypes, ct) {
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if err := w.startGzip(); err != nil {
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return 0, err
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}
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return len(b), nil
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}
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}
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}
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// If we got here, we should not GZIP this response.
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if err := w.startPlain(); err != nil {
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return 0, err
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}
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return len(b), nil
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}
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// startGzip initializes a GZIP writer and writes the buffer.
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func (w *GzipResponseWriter) startGzip() error {
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// Set the GZIP header.
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w.Header().Set(contentEncoding, "gzip")
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// if the Content-Length is already set, then calls to Write on gzip
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// will fail to set the Content-Length header since its already set
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// See: https://github.com/golang/go/issues/14975.
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w.Header().Del(contentLength)
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// Write the header to gzip response.
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if w.code != 0 {
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w.ResponseWriter.WriteHeader(w.code)
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// Ensure that no other WriteHeader's happen
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w.code = 0
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}
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// Initialize and flush the buffer into the gzip response if there are any bytes.
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// If there aren't any, we shouldn't initialize it yet because on Close it will
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// write the gzip header even if nothing was ever written.
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if len(w.buf) > 0 {
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// Initialize the GZIP response.
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w.init()
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n, err := w.gw.Write(w.buf)
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// This should never happen (per io.Writer docs), but if the write didn't
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// accept the entire buffer but returned no specific error, we have no clue
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// what's going on, so abort just to be safe.
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if err == nil && n < len(w.buf) {
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err = io.ErrShortWrite
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}
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return err
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}
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return nil
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}
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// startPlain writes to sent bytes and buffer the underlying ResponseWriter without gzip.
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func (w *GzipResponseWriter) startPlain() error {
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if w.code != 0 {
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w.ResponseWriter.WriteHeader(w.code)
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// Ensure that no other WriteHeader's happen
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w.code = 0
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}
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w.ignore = true
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// If Write was never called then don't call Write on the underlying ResponseWriter.
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if w.buf == nil {
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return nil
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}
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n, err := w.ResponseWriter.Write(w.buf)
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w.buf = nil
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// This should never happen (per io.Writer docs), but if the write didn't
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// accept the entire buffer but returned no specific error, we have no clue
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// what's going on, so abort just to be safe.
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if err == nil && n < len(w.buf) {
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err = io.ErrShortWrite
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}
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return err
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}
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// WriteHeader just saves the response code until close or GZIP effective writes.
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func (w *GzipResponseWriter) WriteHeader(code int) {
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if w.code == 0 {
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w.code = code
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}
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}
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// init graps a new gzip writer from the gzipWriterPool and writes the correct
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// content encoding header.
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func (w *GzipResponseWriter) init() {
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// Bytes written during ServeHTTP are redirected to this gzip writer
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// before being written to the underlying response.
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gzw := gzipWriterPools[w.index].Get().(*gzip.Writer)
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gzw.Reset(w.ResponseWriter)
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w.gw = gzw
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}
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// Close will close the gzip.Writer and will put it back in the gzipWriterPool.
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func (w *GzipResponseWriter) Close() error {
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if w.ignore {
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return nil
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}
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if w.gw == nil {
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// GZIP not triggered yet, write out regular response.
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err := w.startPlain()
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// Returns the error if any at write.
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if err != nil {
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err = fmt.Errorf("gziphandler: write to regular responseWriter at close gets error: %q", err.Error())
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}
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return err
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}
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err := w.gw.Close()
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gzipWriterPools[w.index].Put(w.gw)
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w.gw = nil
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return err
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}
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// Flush flushes the underlying *gzip.Writer and then the underlying
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// http.ResponseWriter if it is an http.Flusher. This makes GzipResponseWriter
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// an http.Flusher.
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func (w *GzipResponseWriter) Flush() {
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if w.gw == nil && !w.ignore {
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// Only flush once startGzip or startPlain has been called.
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//
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// Flush is thus a no-op until we're certain whether a plain
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// or gzipped response will be served.
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return
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}
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if w.gw != nil {
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w.gw.Flush()
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}
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if fw, ok := w.ResponseWriter.(http.Flusher); ok {
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fw.Flush()
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}
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}
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// Hijack implements http.Hijacker. If the underlying ResponseWriter is a
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// Hijacker, its Hijack method is returned. Otherwise an error is returned.
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func (w *GzipResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
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if hj, ok := w.ResponseWriter.(http.Hijacker); ok {
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return hj.Hijack()
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}
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return nil, nil, fmt.Errorf("http.Hijacker interface is not supported")
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}
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// verify Hijacker interface implementation
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var _ http.Hijacker = &GzipResponseWriter{}
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// MustNewGzipLevelHandler behaves just like NewGzipLevelHandler except that in
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// an error case it panics rather than returning an error.
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func MustNewGzipLevelHandler(level int) func(http.Handler) http.Handler {
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wrap, err := NewGzipLevelHandler(level)
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if err != nil {
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panic(err)
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}
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return wrap
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}
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// NewGzipLevelHandler returns a wrapper function (often known as middleware)
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// which can be used to wrap an HTTP handler to transparently gzip the response
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// body if the client supports it (via the Accept-Encoding header). Responses will
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// be encoded at the given gzip compression level. An error will be returned only
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// if an invalid gzip compression level is given, so if one can ensure the level
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// is valid, the returned error can be safely ignored.
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func NewGzipLevelHandler(level int) (func(http.Handler) http.Handler, error) {
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return NewGzipLevelAndMinSize(level, DefaultMinSize)
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}
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// NewGzipLevelAndMinSize behave as NewGzipLevelHandler except it let the caller
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// specify the minimum size before compression.
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func NewGzipLevelAndMinSize(level, minSize int) (func(http.Handler) http.Handler, error) {
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return GzipHandlerWithOpts(CompressionLevel(level), MinSize(minSize))
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}
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func GzipHandlerWithOpts(opts ...option) (func(http.Handler) http.Handler, error) {
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c := &config{
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level: gzip.DefaultCompression,
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minSize: DefaultMinSize,
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}
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for _, o := range opts {
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o(c)
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}
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if err := c.validate(); err != nil {
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return nil, err
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}
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return func(h http.Handler) http.Handler {
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index := poolIndex(c.level)
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.Header().Add(vary, acceptEncoding)
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if acceptsGzip(r) {
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gw := &GzipResponseWriter{
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ResponseWriter: w,
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index: index,
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minSize: c.minSize,
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contentTypes: c.contentTypes,
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}
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defer gw.Close()
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if _, ok := w.(http.CloseNotifier); ok {
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gwcn := GzipResponseWriterWithCloseNotify{gw}
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h.ServeHTTP(gwcn, r)
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} else {
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h.ServeHTTP(gw, r)
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}
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} else {
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h.ServeHTTP(w, r)
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}
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})
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}, nil
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}
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// Parsed representation of one of the inputs to ContentTypes.
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// See https://golang.org/pkg/mime/#ParseMediaType
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type parsedContentType struct {
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mediaType string
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params map[string]string
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}
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// equals returns whether this content type matches another content type.
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func (pct parsedContentType) equals(mediaType string, params map[string]string) bool {
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if pct.mediaType != mediaType {
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return false
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}
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// if pct has no params, don't care about other's params
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if len(pct.params) == 0 {
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return true
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}
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// if pct has any params, they must be identical to other's.
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if len(pct.params) != len(params) {
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return false
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}
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for k, v := range pct.params {
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if w, ok := params[k]; !ok || v != w {
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return false
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}
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}
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return true
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}
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// Used for functional configuration.
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type config struct {
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minSize int
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level int
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contentTypes []parsedContentType
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}
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func (c *config) validate() error {
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if c.level != gzip.DefaultCompression && (c.level < gzip.BestSpeed || c.level > gzip.BestCompression) {
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return fmt.Errorf("invalid compression level requested: %d", c.level)
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}
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if c.minSize < 0 {
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return fmt.Errorf("minimum size must be more than zero")
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}
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return nil
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}
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type option func(c *config)
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func MinSize(size int) option {
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return func(c *config) {
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c.minSize = size
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}
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}
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func CompressionLevel(level int) option {
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return func(c *config) {
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c.level = level
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}
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}
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|
|||
|
// ContentTypes specifies a list of content types to compare
|
|||
|
// the Content-Type header to before compressing. If none
|
|||
|
// match, the response will be returned as-is.
|
|||
|
//
|
|||
|
// Content types are compared in a case-insensitive, whitespace-ignored
|
|||
|
// manner.
|
|||
|
//
|
|||
|
// A MIME type without any other directive will match a content type
|
|||
|
// that has the same MIME type, regardless of that content type's other
|
|||
|
// directives. I.e., "text/html" will match both "text/html" and
|
|||
|
// "text/html; charset=utf-8".
|
|||
|
//
|
|||
|
// A MIME type with any other directive will only match a content type
|
|||
|
// that has the same MIME type and other directives. I.e.,
|
|||
|
// "text/html; charset=utf-8" will only match "text/html; charset=utf-8".
|
|||
|
//
|
|||
|
// By default, responses are gzipped regardless of
|
|||
|
// Content-Type.
|
|||
|
func ContentTypes(types []string) option {
|
|||
|
return func(c *config) {
|
|||
|
c.contentTypes = []parsedContentType{}
|
|||
|
for _, v := range types {
|
|||
|
mediaType, params, err := mime.ParseMediaType(v)
|
|||
|
if err == nil {
|
|||
|
c.contentTypes = append(c.contentTypes, parsedContentType{mediaType, params})
|
|||
|
}
|
|||
|
}
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
// GzipHandler wraps an HTTP handler, to transparently gzip the response body if
|
|||
|
// the client supports it (via the Accept-Encoding header). This will compress at
|
|||
|
// the default compression level.
|
|||
|
func GzipHandler(h http.Handler) http.Handler {
|
|||
|
wrapper, _ := NewGzipLevelHandler(gzip.DefaultCompression)
|
|||
|
return wrapper(h)
|
|||
|
}
|
|||
|
|
|||
|
// acceptsGzip returns true if the given HTTP request indicates that it will
|
|||
|
// accept a gzipped response.
|
|||
|
func acceptsGzip(r *http.Request) bool {
|
|||
|
acceptedEncodings, _ := parseEncodings(r.Header.Get(acceptEncoding))
|
|||
|
return acceptedEncodings["gzip"] > 0.0
|
|||
|
}
|
|||
|
|
|||
|
// returns true if we've been configured to compress the specific content type.
|
|||
|
func handleContentType(contentTypes []parsedContentType, ct string) bool {
|
|||
|
// If contentTypes is empty we handle all content types.
|
|||
|
if len(contentTypes) == 0 {
|
|||
|
return true
|
|||
|
}
|
|||
|
|
|||
|
mediaType, params, err := mime.ParseMediaType(ct)
|
|||
|
if err != nil {
|
|||
|
return false
|
|||
|
}
|
|||
|
|
|||
|
for _, c := range contentTypes {
|
|||
|
if c.equals(mediaType, params) {
|
|||
|
return true
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
return false
|
|||
|
}
|
|||
|
|
|||
|
// parseEncodings attempts to parse a list of codings, per RFC 2616, as might
|
|||
|
// appear in an Accept-Encoding header. It returns a map of content-codings to
|
|||
|
// quality values, and an error containing the errors encountered. It's probably
|
|||
|
// safe to ignore those, because silently ignoring errors is how the internet
|
|||
|
// works.
|
|||
|
//
|
|||
|
// See: http://tools.ietf.org/html/rfc2616#section-14.3.
|
|||
|
func parseEncodings(s string) (codings, error) {
|
|||
|
c := make(codings)
|
|||
|
var e []string
|
|||
|
|
|||
|
for _, ss := range strings.Split(s, ",") {
|
|||
|
coding, qvalue, err := parseCoding(ss)
|
|||
|
|
|||
|
if err != nil {
|
|||
|
e = append(e, err.Error())
|
|||
|
} else {
|
|||
|
c[coding] = qvalue
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
// TODO (adammck): Use a proper multi-error struct, so the individual errors
|
|||
|
// can be extracted if anyone cares.
|
|||
|
if len(e) > 0 {
|
|||
|
return c, fmt.Errorf("errors while parsing encodings: %s", strings.Join(e, ", "))
|
|||
|
}
|
|||
|
|
|||
|
return c, nil
|
|||
|
}
|
|||
|
|
|||
|
// parseCoding parses a single conding (content-coding with an optional qvalue),
|
|||
|
// as might appear in an Accept-Encoding header. It attempts to forgive minor
|
|||
|
// formatting errors.
|
|||
|
func parseCoding(s string) (coding string, qvalue float64, err error) {
|
|||
|
for n, part := range strings.Split(s, ";") {
|
|||
|
part = strings.TrimSpace(part)
|
|||
|
qvalue = DefaultQValue
|
|||
|
|
|||
|
if n == 0 {
|
|||
|
coding = strings.ToLower(part)
|
|||
|
} else if strings.HasPrefix(part, "q=") {
|
|||
|
qvalue, err = strconv.ParseFloat(strings.TrimPrefix(part, "q="), 64)
|
|||
|
|
|||
|
if qvalue < 0.0 {
|
|||
|
qvalue = 0.0
|
|||
|
} else if qvalue > 1.0 {
|
|||
|
qvalue = 1.0
|
|||
|
}
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
if coding == "" {
|
|||
|
err = fmt.Errorf("empty content-coding")
|
|||
|
}
|
|||
|
|
|||
|
return
|
|||
|
}
|