traefik/pkg/middlewares/compress/compress.go

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package compress
import (
"compress/gzip"
"context"
"mime"
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"net/http"
"github.com/klauspost/compress/gzhttp"
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"github.com/opentracing/opentracing-go/ext"
"github.com/traefik/traefik/v2/pkg/config/dynamic"
"github.com/traefik/traefik/v2/pkg/log"
"github.com/traefik/traefik/v2/pkg/middlewares"
"github.com/traefik/traefik/v2/pkg/tracing"
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)
const (
typeName = "Compress"
)
// Compress is a middleware that allows to compress the response.
type compress struct {
next http.Handler
name string
excludes []string
minSize int
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}
// New creates a new compress middleware.
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"}
for _, v := range conf.ExcludedContentTypes {
mediaType, _, err := mime.ParseMediaType(v)
if err != nil {
return nil, err
}
excludes = append(excludes, mediaType)
}
minSize := gzhttp.DefaultMinSize
if conf.MinResponseBodyBytes > 0 {
minSize = conf.MinResponseBodyBytes
}
return &compress{next: next, name: name, excludes: excludes, minSize: minSize}, nil
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}
func (c *compress) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
mediaType, _, err := mime.ParseMediaType(req.Header.Get("Content-Type"))
if err != nil {
log.FromContext(middlewares.GetLoggerCtx(context.Background(), c.name, typeName)).Debug(err)
}
if contains(c.excludes, mediaType) {
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c.next.ServeHTTP(rw, req)
} else {
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ctx := middlewares.GetLoggerCtx(req.Context(), c.name, typeName)
c.gzipHandler(ctx).ServeHTTP(rw, req)
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}
}
func (c *compress) GetTracingInformation() (string, ext.SpanKindEnum) {
return c.name, tracing.SpanKindNoneEnum
}
func (c *compress) gzipHandler(ctx context.Context) http.Handler {
wrapper, err := gzhttp.NewWrapper(
gzhttp.ExceptContentTypes(c.excludes),
gzhttp.CompressionLevel(gzip.DefaultCompression),
gzhttp.MinSize(c.minSize))
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if err != nil {
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log.FromContext(ctx).Error(err)
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}
return wrapper(c.next)
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}
func contains(values []string, val string) bool {
for _, v := range values {
if v == val {
return true
}
}
return false
}