From 02caeafb5d9eeaa7a55b269ae5fccfb806b19e66 Mon Sep 17 00:00:00 2001
From: Darren Shepherd <darren@rancher.com>
Date: Mon, 9 Mar 2020 23:17:40 -0700
Subject: [PATCH] Support gzip encoding

---
 pkg/schemaserver/server/server.go | 26 ++++++++++------
 pkg/schemaserver/writer/gzip.go   | 52 +++++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+), 10 deletions(-)
 create mode 100644 pkg/schemaserver/writer/gzip.go

diff --git a/pkg/schemaserver/server/server.go b/pkg/schemaserver/server/server.go
index efe88cc..e742719 100644
--- a/pkg/schemaserver/server/server.go
+++ b/pkg/schemaserver/server/server.go
@@ -41,19 +41,25 @@ func DefaultAPIServer() *Server {
 	s := &Server{
 		Schemas: types.EmptyAPISchemas().MustAddSchemas(builtin.Schemas),
 		ResponseWriters: map[string]types.ResponseWriter{
-			"json": &writer.EncodingResponseWriter{
-				ContentType: "application/json",
-				Encoder:     types.JSONEncoder,
-			},
-			"html": &writer.HTMLResponseWriter{
-				EncodingResponseWriter: writer.EncodingResponseWriter{
-					Encoder:     types.JSONEncoder,
+			"json": &writer.GzipWriter{
+				ResponseWriter: &writer.EncodingResponseWriter{
 					ContentType: "application/json",
+					Encoder:     types.JSONEncoder,
 				},
 			},
-			"yaml": &writer.EncodingResponseWriter{
-				ContentType: "application/yaml",
-				Encoder:     types.YAMLEncoder,
+			"html": &writer.GzipWriter{
+				ResponseWriter: &writer.HTMLResponseWriter{
+					EncodingResponseWriter: writer.EncodingResponseWriter{
+						Encoder:     types.JSONEncoder,
+						ContentType: "application/json",
+					},
+				},
+			},
+			"yaml": &writer.GzipWriter{
+				ResponseWriter: &writer.EncodingResponseWriter{
+					ContentType: "application/yaml",
+					Encoder:     types.YAMLEncoder,
+				},
 			},
 		},
 		AccessControl: &SchemaBasedAccess{},
diff --git a/pkg/schemaserver/writer/gzip.go b/pkg/schemaserver/writer/gzip.go
new file mode 100644
index 0000000..c028fae
--- /dev/null
+++ b/pkg/schemaserver/writer/gzip.go
@@ -0,0 +1,52 @@
+package writer
+
+import (
+	"compress/gzip"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"strings"
+
+	"github.com/rancher/steve/pkg/schemaserver/types"
+)
+
+type GzipWriter struct {
+	types.ResponseWriter
+}
+
+func setup(apiOp *types.APIRequest) (*types.APIRequest, io.Closer) {
+	if !strings.Contains(apiOp.Request.Header.Get("Accept-Encoding"), "gzip") {
+		return apiOp, ioutil.NopCloser(nil)
+	}
+
+	apiOp.Response.Header().Set("Content-Encoding", "gzip")
+	apiOp.Response.Header().Del("Content-Length")
+
+	gz := gzip.NewWriter(apiOp.Response)
+	gzw := &gzipResponseWriter{Writer: gz, ResponseWriter: apiOp.Response}
+
+	newOp := *apiOp
+	newOp.Response = gzw
+	return &newOp, gz
+}
+
+func (g *GzipWriter) Write(apiOp *types.APIRequest, code int, obj types.APIObject) {
+	apiOp, closer := setup(apiOp)
+	defer closer.Close()
+	g.ResponseWriter.Write(apiOp, code, obj)
+}
+
+func (g *GzipWriter) WriteList(apiOp *types.APIRequest, code int, obj types.APIObjectList) {
+	apiOp, closer := setup(apiOp)
+	defer closer.Close()
+	g.ResponseWriter.WriteList(apiOp, code, obj)
+}
+
+type gzipResponseWriter struct {
+	io.Writer
+	http.ResponseWriter
+}
+
+func (g gzipResponseWriter) Write(b []byte) (int, error) {
+	return g.Writer.Write(b)
+}