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main.go
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main.go
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package main
import (
"context"
"crypto/subtle"
"encoding/json"
"fmt"
"html/template"
"io"
"log"
"mime"
"net/http"
"os"
"path"
"path/filepath"
"strings"
"sync"
"cloud.google.com/go/storage"
"github.com/google/uuid"
"google.golang.org/api/option"
)
func main() {
port := os.Getenv("PORT")
if port == "" {
port = "8080"
}
bucket := os.Getenv("BUCKET")
bucketPath := os.Getenv("BUCKET_PATH")
baseURL := os.Getenv("BASE_URL")
authUser := os.Getenv("AUTH_USER")
authPassword := os.Getenv("AUTH_PASSWORD")
objectMetadataJSON := os.Getenv("OBJECT_METADATA") // json
gcpServiceAccountJSON := os.Getenv("GOOGLE_APPLICATION_CREDENTIALS_JSON") // json
if bucket == "" {
log.Fatal("BUCKET env required")
}
if baseURL == "" {
log.Fatal("BASE_URL env required")
}
var objectMetadata map[string]string
if len(objectMetadataJSON) > 0 {
err := json.Unmarshal([]byte(objectMetadataJSON), &objectMetadata)
if err != nil {
log.Fatalf("unmarshaling object metadata; %v", err)
}
}
ctx := context.Background()
var opt []option.ClientOption
if gcpServiceAccountJSON != "" {
opt = append(opt, option.WithCredentialsJSON([]byte(gcpServiceAccountJSON)))
}
client, err := storage.NewClient(ctx, opt...)
if err != nil {
log.Fatal(err)
}
var h http.Handler
h = &uploader{
Bucket: client.Bucket(bucket),
BucketPath: bucketPath,
BaseURL: baseURL,
ObjectMetadata: objectMetadata,
}
h = &basicAuth{
User: authUser,
Password: authPassword,
Handler: h,
}
log.Print("start server on 0.0.0.0:" + port)
log.Fatal(http.ListenAndServe(":"+port, h))
}
type uploader struct {
Bucket *storage.BucketHandle
BucketPath string
BaseURL string
ObjectMetadata map[string]string
initOnce sync.Once
t *template.Template
}
func (h *uploader) init() {
if !strings.HasSuffix(h.BaseURL, "/") {
h.BaseURL += "/"
}
// language=HTML
h.t = template.Must(template.New("").Parse(`<!doctype html>
<title>GCS Uploader</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/dropzone@5.8.1/dist/min/dropzone.min.css">
<script src="https://cdn.jsdelivr.net/npm/dropzone@5.8.1/dist/min/dropzone.min.js" defer></script>
<script src="https://cdn.jsdelivr.net/npm/clipboard@2.0.8/dist/clipboard.min.js" defer></script>
<style>
form {
margin: 16px;
}
</style>
<form method="POST" action="/" enctype="multipart/form-data" class="dropzone">
<div class="fallback">
<input name="file" type="file">
</div>
</form>
<script>
document.addEventListener('DOMContentLoaded', () => {
Dropzone.autoDiscover = false
new Dropzone("form", {
url: '/',
parallelUploads: 5,
maxFilesize: 10240,
success (file, responseText) {
file.previewTemplate.addEventListener('click', () => {
open(responseText, '_blank')
})
const name = file.previewTemplate.querySelector('[data-dz-name]')
if (name) {
name.innerText = responseText
name.dataset.clipboardText = responseText
new ClipboardJS(name)
name.addEventListener('click', (ev) => {
ev.stopPropagation()
})
}
}
})
})
</script>`))
}
func (h *uploader) ServeHTTP(w http.ResponseWriter, r *http.Request) {
h.initOnce.Do(h.init)
if r.URL.Path != "/" {
http.Redirect(w, r, "/", http.StatusFound)
return
}
if r.Method == http.MethodPost {
h.handlePost(w, r)
return
}
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.Header().Set("Cache-Control", "private, max-age=0")
h.t.Execute(w, nil)
}
func (h *uploader) handlePost(w http.ResponseWriter, r *http.Request) {
fp, fh, err := r.FormFile("file")
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
defer fp.Close()
ct := fh.Header.Get("Content-Type")
ext := filepath.Ext(fh.Filename)
if ext == "" {
exts, _ := mime.ExtensionsByType(ct)
if len(exts) > 0 {
ext = exts[0]
}
}
fn := uuid.New().String() + ext
obj := h.Bucket.Object(path.Join(h.BucketPath, fn))
objWriter := obj.NewWriter(r.Context())
defer func() {
if err != nil {
objWriter.Close()
obj.Delete(context.Background())
}
}()
if objWriter.Metadata == nil {
objWriter.Metadata = make(map[string]string)
}
for k, v := range h.ObjectMetadata {
objWriter.Metadata[k] = v
}
objWriter.CacheControl = "public, max-age=31536000, immutable"
objWriter.ContentType = ct
_, err = io.Copy(objWriter, fp)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
err = objWriter.Close()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
fmt.Fprint(w, h.BaseURL+fn)
log.Printf("uploaded: fn=%s; size=%d", fn, fh.Size)
}
type basicAuth struct {
User string
Password string
Handler http.Handler
}
func (b *basicAuth) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if b.User == "" || b.Password == "" {
b.Handler.ServeHTTP(w, r)
return
}
var ok bool
defer func() {
if !ok {
w.Header().Set("WWW-Authenticate", "Basic")
http.Error(w, "Unauthorized", http.StatusUnauthorized)
}
}()
user, password, ok := r.BasicAuth()
if !ok {
return
}
okUser := subtle.ConstantTimeCompare([]byte(b.User), []byte(user)) == 1
okPassword := subtle.ConstantTimeCompare([]byte(b.Password), []byte(password)) == 1
ok = okUser && okPassword
if !ok {
return
}
b.Handler.ServeHTTP(w, r)
}