82 lines
2 KiB
Go
82 lines
2 KiB
Go
package compress
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import (
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"compress/gzip"
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"context"
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"mime"
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"net/http"
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"github.com/NYTimes/gziphandler"
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"github.com/containous/traefik/v2/pkg/config/dynamic"
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"github.com/containous/traefik/v2/pkg/log"
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"github.com/containous/traefik/v2/pkg/middlewares"
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"github.com/containous/traefik/v2/pkg/tracing"
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"github.com/opentracing/opentracing-go/ext"
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)
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const (
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typeName = "Compress"
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)
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// Compress is a middleware that allows to compress the response.
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type compress struct {
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next http.Handler
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name string
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excludes []string
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}
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// New creates a new compress middleware.
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func New(ctx context.Context, next http.Handler, conf dynamic.Compress, name string) (http.Handler, error) {
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log.FromContext(middlewares.GetLoggerCtx(ctx, name, typeName)).Debug("Creating middleware")
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excludes := []string{"application/grpc"}
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for _, v := range conf.ExcludedContentTypes {
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mediaType, _, err := mime.ParseMediaType(v)
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if err != nil {
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return nil, err
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}
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excludes = append(excludes, mediaType)
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}
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return &compress{next: next, name: name, excludes: excludes}, nil
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}
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func (c *compress) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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mediaType, _, err := mime.ParseMediaType(req.Header.Get("Content-Type"))
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if err != nil {
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log.FromContext(middlewares.GetLoggerCtx(context.Background(), c.name, typeName)).Debug(err)
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}
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if contains(c.excludes, mediaType) {
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c.next.ServeHTTP(rw, req)
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} else {
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ctx := middlewares.GetLoggerCtx(req.Context(), c.name, typeName)
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gzipHandler(ctx, c.next).ServeHTTP(rw, req)
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}
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}
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func (c *compress) GetTracingInformation() (string, ext.SpanKindEnum) {
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return c.name, tracing.SpanKindNoneEnum
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}
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func gzipHandler(ctx context.Context, h http.Handler) http.Handler {
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wrapper, err := gziphandler.GzipHandlerWithOpts(
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gziphandler.CompressionLevel(gzip.DefaultCompression),
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gziphandler.MinSize(gziphandler.DefaultMinSize))
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if err != nil {
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log.FromContext(ctx).Error(err)
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}
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return wrapper(h)
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}
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func contains(values []string, val string) bool {
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for _, v := range values {
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if v == val {
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return true
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}
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}
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return false
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}
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