Add gzip

Dockerfile

@@ -1,8 +1,11 @@
-FROM frolvlad/alpine-glibc:alpine-3.9_glibc-2.29
-RUN apk update && apk add --no-cache ca-certificates git
 
+FROM golang:1.13-alpine as certs
+RUN apk update && apk add --no-cache ca-certificates
+
+FROM busybox:glibc
 RUN mkdir -p /var/log
 WORKDIR /main
+COPY --from=certs /etc/ssl/certs /etc/ssl/certs
 
 COPY . .
 
@@ -10,3 +13,4 @@ ENV GOPATH=""
 ENV MNT="/mnt/"
 ENTRYPOINT ["/main/exec-notes-server"]
 CMD []
+

server/gzipresponsewriter.go

@@ -0,0 +1,49 @@
+package server
+
+import (
+	"compress/gzip"
+	"fmt"
+	"net/http"
+	"strings"
+)
+
+type GZipResponseWriter struct {
+	w  http.ResponseWriter
+	gz *gzip.Writer
+}
+
+func NewGZipResponseWriter(w http.ResponseWriter) *GZipResponseWriter {
+	w.Header().Add("Content-Type", "text/html")
+	w.Header().Add("Content-Encoding", "gzip")
+	return &GZipResponseWriter{
+		w:  w,
+		gz: gzip.NewWriter(w),
+	}
+}
+
+func (gz *GZipResponseWriter) Header() http.Header {
+	return gz.w.Header()
+}
+
+func (gz *GZipResponseWriter) WriteHeader(statusCode int) {
+	gz.w.WriteHeader(statusCode)
+}
+
+func (gz *GZipResponseWriter) Write(b []byte) (int, error) {
+	return gz.gz.Write(b)
+}
+
+func (gz *GZipResponseWriter) Close() error {
+	return gz.gz.Close()
+}
+
+func (s *Server) gzip(h http.HandlerFunc) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if encoding, _ := r.Header["Accept-Encoding"]; strings.Contains(fmt.Sprint(encoding), "gzip") {
+			gz := NewGZipResponseWriter(w)
+			defer gz.Close()
+			w = gz
+		}
+		h(w, r)
+	}
+}

server/gzipresponsewriter_test.go

@@ -0,0 +1,34 @@
+package server
+
+import (
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestGZipResponseWriter(t *testing.T) {
+	s := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		gz := NewGZipResponseWriter(w)
+		defer gz.Close()
+		fmt.Fprintln(gz, "Hello world")
+	}))
+	defer s.Close()
+
+	req := httptest.NewRequest("GET", s.URL, nil)
+	req.RequestURI = ""
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		t.Fatal(resp.StatusCode)
+	}
+	if b, err := ioutil.ReadAll(resp.Body); err != nil {
+		t.Fatal(err)
+	} else if s := string(b); s != "Hello world\n" {
+		t.Fatalf("%q", s)
+	}
+}

server/routes.go

@@ -18,27 +18,27 @@ func (s *Server) Routes() error {
 		},
 		{
 			path:    fmt.Sprintf("notes/%s%s", wildcard, wildcard),
-			handler: s.authenticate(s.notes),
+			handler: s.gzip(s.authenticate(s.notes)),
 		},
 		{
 			path:    fmt.Sprintf("edit/%s%s", wildcard, wildcard),
-			handler: s.authenticate(s.edit),
+			handler: s.gzip(s.authenticate(s.edit)),
 		},
 		{
 			path:    fmt.Sprintf("delete/%s%s", wildcard, wildcard),
-			handler: s.authenticate(s.delete),
+			handler: s.gzip(s.authenticate(s.delete)),
 		},
 		{
 			path:    fmt.Sprintf("submit/%s%s", wildcard, wildcard),
-			handler: s.authenticate(s.submit),
+			handler: s.gzip(s.authenticate(s.submit)),
 		},
 		{
 			path:    fmt.Sprintf("create/%s%s", wildcard, wildcard),
-			handler: s.authenticate(s.create),
+			handler: s.gzip(s.authenticate(s.create)),
 		},
 		{
 			path:    fmt.Sprintf("search"),
-			handler: s.authenticate(s.search),
+			handler: s.gzip(s.authenticate(s.search)),
 		},
 	}