syncthing/lib/assets/assets_test.go

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// Copyright (C) 2020 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package assets
import (
"bytes"
"compress/gzip"
"io"
"io/ioutil"
"net/http"
"net/http/httptest"
"strconv"
"strings"
"testing"
"time"
)
func compress(s string) string {
var sb strings.Builder
gz := gzip.NewWriter(&sb)
io.WriteString(gz, s)
gz.Close()
return sb.String()
}
func decompress(p []byte) (out []byte) {
r, err := gzip.NewReader(bytes.NewBuffer(p))
if err == nil {
out, err = ioutil.ReadAll(r)
}
if err != nil {
panic(err)
}
return out
}
func TestServe(t *testing.T) { testServe(t, false) }
func TestServeGzip(t *testing.T) { testServe(t, true) }
func testServe(t *testing.T, gzip bool) {
const indexHTML = `<html>Hello, world!</html>`
content := indexHTML
if gzip {
content = compress(indexHTML)
}
handler := func(w http.ResponseWriter, r *http.Request) {
Serve(w, r, Asset{
Content: content,
Gzipped: gzip,
Length: len(indexHTML),
Filename: r.URL.Path[1:],
Modified: time.Unix(0, 0),
})
}
for _, acceptGzip := range []bool{true, false} {
r := httptest.NewRequest("GET", "http://localhost/index.html", nil)
if acceptGzip {
r.Header.Set("accept-encoding", "gzip, deflate")
}
w := httptest.NewRecorder()
handler(w, r)
res := w.Result()
if res.StatusCode != http.StatusOK {
t.Fatalf("wanted OK, got status %d", res.StatusCode)
}
if ctype := res.Header.Get("Content-Type"); ctype != "text/html; charset=utf-8" {
t.Errorf("unexpected Content-Type %q", ctype)
}
// ETags must be quoted ASCII strings:
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag
if etag := res.Header.Get("ETag"); etag != `"0"` {
t.Errorf("unexpected ETag %q", etag)
}
body, _ := ioutil.ReadAll(res.Body)
// Content-Length is the number of bytes in the encoded (compressed) body
// (https://stackoverflow.com/a/3819303).
n, err := strconv.Atoi(res.Header.Get("Content-Length"))
if err != nil {
t.Errorf("malformed Content-Length %q", res.Header.Get("Content-Length"))
} else if n != len(body) {
t.Errorf("wrong Content-Length %d, should be %d", n, len(body))
}
if gzip && acceptGzip {
body = decompress(body)
}
if string(body) != indexHTML {
t.Fatalf("unexpected content %q", body)
}
}
r := httptest.NewRequest("GET", "http://localhost/index.html", nil)
r.Header.Set("if-none-match", `"0"`)
w := httptest.NewRecorder()
handler(w, r)
res := w.Result()
if res.StatusCode != http.StatusNotModified {
t.Fatalf("wanted NotModified, got status %d", res.StatusCode)
}
r = httptest.NewRequest("GET", "http://localhost/index.html", nil)
r.Header.Set("if-modified-since", time.Now().Format(http.TimeFormat))
w = httptest.NewRecorder()
handler(w, r)
res = w.Result()
if res.StatusCode != http.StatusNotModified {
t.Fatalf("wanted NotModified, got status %d", res.StatusCode)
}
}