/
main.go
85 lines (70 loc) · 1.88 KB
/
main.go
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package main
//go:generate go run genstatic.go -o static.go
import (
"bytes"
"compress/gzip"
"crypto/sha1"
"encoding/base64"
"flag"
"io/ioutil"
"log"
"mime"
"net/http"
"path/filepath"
"strings"
"time"
)
var staticHTML = make(map[string]string)
var start = time.Now()
var addr = flag.String("addr", ":443", "address to listen on")
func makeEtag(b []byte) string {
sum := sha1.Sum(b)
return `"` + base64.StdEncoding.EncodeToString(sum[:]) + `"`
}
func staticHandler(path, gzb64src string) func(w http.ResponseWriter, req *http.Request) {
gzsrc, err := base64.StdEncoding.DecodeString(gzb64src)
if err != nil {
log.Fatalf("error decoding %s: %v", path, err)
}
r, err := gzip.NewReader(bytes.NewReader(gzsrc))
if err != nil {
log.Fatalf("error gunzipping %s: %v", path, err)
}
src, err := ioutil.ReadAll(r)
if err != nil {
log.Fatalf("error gunzipping %s: %v", path, err)
}
ctype := mime.TypeByExtension(filepath.Ext(path))
if ctype == "" {
ctype = http.DetectContentType(src)
}
gzetag := makeEtag(gzsrc)
etag := makeEtag(src)
return func(w http.ResponseWriter, req *http.Request) {
if req.URL.Path != path && !strings.HasPrefix(req.URL.Path, "/ng/") {
http.NotFound(w, req)
return
}
w.Header().Set("Content-Type", ctype)
if strings.Contains(req.Header.Get("Accept-Encoding"), "gzip") {
w.Header().Set("Content-Encoding", "gzip")
w.Header().Set("Etag", gzetag)
http.ServeContent(w, req, path, start, bytes.NewReader(gzsrc))
return
}
w.Header().Set("Etag", etag)
http.ServeContent(w, req, path, start, bytes.NewReader(src))
}
}
func main() {
flag.Parse()
for name, src := range staticHTML {
http.HandleFunc(name, staticHandler(name, src))
}
log.Printf("serving neugram.io on %s", *addr)
if *addr == ":443" {
log.Fatal(http.ListenAndServeTLS(*addr, "www.pem", "www.key", nil))
} else {
log.Fatal(http.ListenAndServe(*addr, nil))
}
}