appengine_flexible/go115_and_earlier/storage/storage.go (70 lines of code) (raw):
// Copyright 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// [START gae_flex_storage_app]
// Sample storage demonstrates use of the cloud.google.com/go/storage package from App Engine flexible environment.
package main
import (
"context"
"fmt"
"io"
"log"
"net/http"
"net/url"
"os"
"cloud.google.com/go/storage"
"google.golang.org/appengine"
)
var (
storageClient *storage.Client
// Set this in app.yaml when running in production.
bucket = os.Getenv("GCLOUD_STORAGE_BUCKET")
)
func main() {
ctx := context.Background()
var err error
storageClient, err = storage.NewClient(ctx)
if err != nil {
log.Fatal(err)
}
http.HandleFunc("/", formHandler)
http.HandleFunc("/upload", uploadHandler)
appengine.Main()
}
func uploadHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
http.Error(w, "", http.StatusMethodNotAllowed)
return
}
ctx := appengine.NewContext(r)
f, fh, err := r.FormFile("file")
if err != nil {
msg := fmt.Sprintf("Could not get file: %v", err)
http.Error(w, msg, http.StatusBadRequest)
return
}
defer f.Close()
sw := storageClient.Bucket(bucket).Object(fh.Filename).NewWriter(ctx)
if _, err := io.Copy(sw, f); err != nil {
msg := fmt.Sprintf("Could not write file: %v", err)
http.Error(w, msg, http.StatusInternalServerError)
return
}
if err := sw.Close(); err != nil {
msg := fmt.Sprintf("Could not put file: %v", err)
http.Error(w, msg, http.StatusInternalServerError)
return
}
u, _ := url.Parse("/" + bucket + "/" + sw.Attrs().Name)
fmt.Fprintf(w, "Successful! URL: https://storage.googleapis.com%s", u.EscapedPath())
}
func formHandler(w http.ResponseWriter, r *http.Request) {
fmt.Fprint(w, formHTML)
}
const formHTML = `<!DOCTYPE html>
<html>
<head>
<title>Storage</title>
<meta charset="utf-8">
</head>
<body>
<form method="POST" action="/upload" enctype="multipart/form-data">
<input type="file" name="file">
<input type="submit">
</form>
</body>
</html>`
// [END gae_flex_storage_app]