Usar o Cloud Storage

Use o Cloud Storage para disponibilizar arquivos como filmes, imagens ou outros conteúdos estáticos.

Neste documento, descrevemos como usar as bibliotecas de cliente do Cloud para Cloud Storage no seu aplicativo para armazenar dados e recuperar dados

Antes de começar

  • Siga as instruções em Como configurar o ambiente de desenvolvimento para configurar o ambiente e o projeto e entender como os aplicativos são estruturados no App Engine. Anote e salve o ID do projeto. Você precisará dele para executar o aplicativo de amostra descrito neste documento.

  • Certifique-se de criar um bucket do Cloud Storage para o aplicativo invocando o seguinte comando:

    gsutil mb gs://[YOUR_BUCKET_NAME]

  • Configure o bucket como acessível para leitura pública para disponibilização de arquivos:

    gsutil defacl set public-read gs://[YOUR_BUCKET_NAME]

Faça o download da amostra

Go

Para clonar o repositório:

v1.18 e posterior 

  git clone https://github.com/GoogleCloudPlatform/golang-samples.git
  cd golang-samples/appengine_flexible/storage

v1.15 e anteriores 

  git clone https://github.com/GoogleCloudPlatform/golang-samples.git
  cd golang-samples/appengine_flexible/go115_and_earlier/storage

Java

Para clonar o repositório:

Versão 11/17 

  git clone https://github.com/GoogleCloudPlatform/java-docs-samples
  cd java-docs-samples/flexible/java-11/cloudstorage

Versão 8 

  git clone https://github.com/GoogleCloudPlatform/java-docs-samples
  cd java-docs-samples/flexible/java-8/cloudstorage

Node.js

Para clonar o repositório:

v18 e posteriores 

  git clone https://github.com/GoogleCloudPlatform/nodejs-docs-samples/
  cd nodejs-docs-samples/appengine/storage/flexible

v16 e anteriores 

  git clone https://github.com/GoogleCloudPlatform/nodejs-docs-samples/
  cd nodejs-docs-samples/appengine/storage/flexible_nodejs16_and_earlier

PHP

Para clonar o repositório:

git clone https://github.com/GoogleCloudPlatform/php-docs-samples
cd php-docs-samples/appengine/flexible/storage

Python

Para clonar o repositório:

v3.8 e posterior 

git clone https://github.com/GoogleCloudPlatform/python-docs-samples
cd python-docs-samples/appengine/flexible/storage

v3.7 e anteriores 

git clone https://github.com/GoogleCloudPlatform/python-docs-samples
cd python-docs-samples/appengine/flexible_python37_and_earlier/storage

Ruby

Para clonar o repositório:

versão 3.2 

git clone https://github.com/GoogleCloudPlatform/ruby-docs-samples
cd ruby-docs-samples/appengine/flexible/storage/

versão 3.1 e anteriores 

git clone https://github.com/GoogleCloudPlatform/ruby-docs-samples
cd ruby-docs-samples/appengine/flexible/ruby31-and-earlier/storage/

.NET

  1. Faça o download do aplicativo de amostra e extraia-o.

  2. Se você estiver usando a linha de comando, navegue até o seguinte diretório de aplicativos:

    versão 6 e mais recentes

    dotnet-docs-samples\appengine\flexible\CloudStorage\CloudStorage.Sample

    versão 3.1 e anteriores

    Use a ramificação flex-dotnet3-and-earlier.

      dotnet-docs-samples\appengine\flexible\CloudStorage

    Para executar o aplicativo localmente, configure uma conta de serviço e faça o download das credenciais:

  3. Abra a lista de credenciais no console do Google Cloud.

    Abrir a lista de credenciais

  4. Clique em Criar credenciais.

  5. Selecione Chave da conta de serviço.

    A janela Criar chave da conta de serviço é exibida.

  6. Clique no menu suspenso abaixo de Conta de serviço e depois em Conta de serviço padrão do Compute Engine.

  7. Selecione JSON como Tipo de chave.

  8. Clique em Criar.

    Uma janela Nova chave privada é exibida e o download da chave privada é realizado automaticamente.

  9. Clique em Fechar.

Edite a configuração do projeto e instale as dependências

Go

Em app.yaml, defina GCLOUD_STORAGE_BUCKET. Esse valor é o nome do bucket do Cloud Storage criado anteriormente.

v1.18 e posterior 

# Copyright 2019 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.

runtime: go
env: flex

runtime_config:
  operating_system: ubuntu22
  runtime_version: 1.19

automatic_scaling:
  min_num_instances: 1

env_variables:
  GCLOUD_STORAGE_BUCKET: your-bucket-name

v1.15 e anteriores 

# 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.

runtime: go
env: flex

automatic_scaling:
  min_num_instances: 1

env_variables:
  GCLOUD_STORAGE_BUCKET: your-bucket-name

Java

Em app.yaml, defina BUCKET_NAME como o Cloud Storage criado anteriormente para o projeto.

versão 11/17 

runtime: java
env: flex
runtime_config:
  operating_system: ubuntu18
  runtime_version: 11
handlers:
- url: /.*
  script: this field is required, but ignored

env_variables:
  BUCKET_NAME: YOUR-BUCKET-NAME

versão 8 

#  Copyright 2023 Google Inc.
#
#  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
#
#       http://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.

runtime: java
env: flex

handlers:
- url: /.*
  script: this field is required, but ignored

env_variables:
  BUCKET_NAME: YOUR-BUCKET-NAME

Em pom.xml, defina com.google.cloud como uma dependência e especifique google-cloud-storage como o artifactID dessa dependência. Isso fornece as funções para usar o Cloud Storage.

versão 11/17 

<!--  Using libraries-bom to manage versions.
See https://github.com/GoogleCloudPlatform/cloud-opensource-java/wiki/The-Google-Cloud-Platform-Libraries-BOM -->
<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>com.google.cloud</groupId>
      <artifactId>libraries-bom</artifactId>
      <version>26.32.0</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-dependencies</artifactId>
      <version>${spring.boot.version}</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

<dependencies>
  <dependency>
    <groupId>com.google.cloud</groupId>
    <artifactId>google-cloud-storage</artifactId>
  </dependency>
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
  </dependency>
  <dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <type>jar</type>
    <scope>provided</scope>
  </dependency>
  <dependency>
    <groupId>org.junit.vintage</groupId>
    <artifactId>junit-vintage-engine</artifactId>
    <scope>test</scope>
  </dependency>
  <dependency>
    <groupId>org.junit-pioneer</groupId>
    <artifactId>junit-pioneer</artifactId>
    <version>2.2.0</version>
    <scope>test</scope>
  </dependency>
  <dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-inline</artifactId>
    <scope>test</scope>
  </dependency>
  <dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-junit-jupiter</artifactId>
    <scope>test</scope>
  </dependency>
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
  </dependency>

</dependencies>

Versão 8 

<!--  Using libraries-bom to manage versions.
See https://github.com/GoogleCloudPlatform/cloud-opensource-java/wiki/The-Google-Cloud-Platform-Libraries-BOM -->
<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>com.google.cloud</groupId>
      <artifactId>libraries-bom</artifactId>
      <version>26.28.0</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

<dependencies>
  <dependency>
    <groupId>com.google.cloud</groupId>
    <artifactId>google-cloud-storage</artifactId>
  </dependency>
</dependencies>

Node.js

Em app.yaml, adicione o ID do projeto ao valor do ambiente GOOGLE_CLOUD_PROJECT. Em seguida, configure o valor de ambiente GCLOUD_STORAGE_BUCKET para o nome do bucket do Cloud Storage criado anteriormente.

v18 e posteriores 

runtime: nodejs
env: flex
runtime_config:
  operating_system: ubuntu22

env_variables:
  GCLOUD_STORAGE_BUCKET: YOUR_BUCKET_NAME

v16 e anteriores 

runtime: nodejs
env: flex

env_variables:
  GCLOUD_STORAGE_BUCKET: YOUR_BUCKET_NAME

Em package.json, adicione @google-cloud/storage como uma dependência, que fornece as funções para usar o Cloud Storage.

v18 e posteriores 

{
  "name": "appengine-storage",
  "description": "Node.js Google Cloud Storage sample for Google App Engine",
  "scripts": {
    "start": "node app.js",
    "test": "c8 mocha -p -j 2 system-test/*.test.js --exit --timeout=30000"
  },
  "engines": {
    "node": ">=16.0.0"
  },
  "dependencies": {
    "@google-cloud/storage": "^7.0.0",
    "express": "^4.18.2",
    "multer": "^1.4.5-lts.1",
    "pug": "^3.0.2"
  },
  "devDependencies": {
    "@types/express": "^4.17.17",
    "@types/multer": "^1.4.7",
    "@types/proxyquire": "^1.3.28",
    "@types/supertest": "^2.0.12",
    "@types/uuid": "^9.0.1",
    "c8": "^8.0.0",
    "mocha": "^10.2.0",
    "proxyquire": "^2.1.3",
    "supertest": "^6.3.3",
    "uuid": "^9.0.0"
  }
}

v16 e anteriores 

{
  "name": "appengine-storage",
  "description": "Node.js Google Cloud Storage sample for Google App Engine",
  "scripts": {
    "start": "node app.js",
    "test": "c8 mocha -p -j 2 system-test/*.test.js --exit --timeout=30000"
  },
  "engines": {
    "node": "16.x.x"
  },
  "dependencies": {
    "@google-cloud/storage": "^7.0.0",
    "express": "^4.18.2",
    "multer": "^1.4.5-lts.1",
    "pug": "^3.0.2"
  },
  "devDependencies": {
    "@types/express": "^4.17.17",
    "@types/multer": "^1.4.7",
    "@types/proxyquire": "^1.3.28",
    "@types/supertest": "^2.0.12",
    "@types/uuid": "^9.0.1",
    "c8": "^8.0.0",
    "mocha": "^10.2.0",
    "proxyquire": "^2.1.3",
    "supertest": "^6.3.3",
    "uuid": "^9.0.0"
  }
}

Consulte o arquivo README.md para instruções sobre como executar e testar localmente.

PHP

Em app.yaml, defina CLOUD_STORAGE_BUCKET. Esse valor é o nome do bucket do Cloud Storage criado anteriormente.

env_variables:
  GOOGLE_STORAGE_BUCKET: "your-bucket-name"

Em composer.json, observe que é preciso incluir a biblioteca de cliente do Cloud, porque isso fornece as funções do Cloud Storage.

{
    "require": {
        "slim/slim": "^4.0",
        "slim/psr7": "^1.3",
        "google/cloud-storage": "^1.0",
        "php-di/slim-bridge": "^3.1"
    }
}

Python

Em app.yaml, defina GOOGLE_STORAGE_BUCKET. Esse valor é o nome do bucket do Cloud Storage criado anteriormente.

v3.8 e posterior 

env_variables:
  CLOUD_STORAGE_BUCKET: [your-bucket-name]

v3.7 e anteriores 

env_variables:
    CLOUD_STORAGE_BUCKET: your-bucket-name

Em requirements.txt, observe que é preciso incluir a biblioteca google-cloud-storage, porque isso fornece as funções do Cloud Storage.

v3.8 e posterior 

Flask==3.0.0
google-cloud-storage==2.9.0
gunicorn==22.0.0

v3.7 e anteriores 

Flask==3.0.0; python_version > '3.6'
Flask==2.0.3; python_version < '3.7'
werkzeug==3.0.1; python_version > '3.7'
werkzeug==2.3.8; python_version <= '3.7'
google-cloud-storage==2.9.0
gunicorn==22.0.0

Ruby

Em app.yaml, defina GCLOUD_STORAGE_BUCKET como o Cloud Storage criado anteriormente para o projeto.

versão 3.2 

runtime: ruby
env: flex
entrypoint: bundle exec ruby app.rb

runtime_config:
  operating_system: ubuntu22

env_variables:
  GOOGLE_CLOUD_STORAGE_BUCKET: <your-bucket-name>

versão 3.1 e anteriores 

runtime: ruby
env: flex
entrypoint: bundle exec ruby app.rb

env_variables:
  GOOGLE_CLOUD_STORAGE_BUCKET: <your-bucket-name>

É necessário incluir a biblioteca gcloud em Gemfile para usar os recursos do Cloud Storage.

source "https://rubygems.org"

gem "google-cloud-storage"
gem "sinatra"

.NET

Faça as configurações a seguir:

versão 6 e mais recentes

No arquivo app.yaml, defina TEST_GOOGLE_BUCKET_NAME como o Cloud Storage criado anteriormente para o projeto.

env_variables:
  TEST_GOOGLE_BUCKET_NAME: [your-bucket-name]

versão 3.1 e anteriores

Em appsettings.json, defina BucketName. Esse valor é o nome do bucket do Cloud Storage criado anteriormente.

{
  "GoogleCloudStorage": {
    "BucketName": "your-google-bucket-name"
  },
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Debug",
      "System": "Information",
      "Microsoft": "Information"
    }
  }
}

Código do aplicativo

Go

O aplicativo de amostra apresenta uma página da Web que solicita ao usuário um arquivo para armazenar no Cloud Storage. Quando o usuário seleciona um arquivo e clica em enviar, o gerenciador de uploads grava o arquivo no bucket do Cloud Storage usando a função NewWriter do Cloud Storage.

Para recuperar esse arquivo do Cloud Storage, especifique o nome do bucket e o nome do arquivo. Armazene esses valores no app para uso futuro.

// Copyright 2019 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.

// 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>`

Java

O aplicativo de amostra apresenta uma página da Web que solicita ao usuário um arquivo para armazenar no Cloud Storage. Quando o usuário seleciona um arquivo e clica em "Enviar", o gerenciador de solicitações doPost grava o arquivo no bucket do Cloud Storage usando o Storage.create.

Para recuperar esse arquivo do Cloud Storage, especifique o nome do bucket e o nome do arquivo. Armazene esses valores no app para uso futuro.

versão 11/17 

@SuppressWarnings("serial")
@WebServlet(name = "upload", value = "/upload")
@MultipartConfig()
public class UploadServlet extends HttpServlet {

  private static final String BUCKET_NAME =
      System.getenv().getOrDefault("BUCKET_NAME", "my-test-bucket");
  private static Storage storage = null;

  public UploadServlet() {
    storage = StorageOptions.getDefaultInstance().getService();
  }

  @Override
  public void doPost(HttpServletRequest req, HttpServletResponse resp)
      throws IOException, ServletException {
    final Part filePart = req.getPart("file");
    final String fileName = filePart.getSubmittedFileName();
    // Modify access list to allow all users with link to read file
    List<Acl> acls = new ArrayList<>();
    acls.add(Acl.of(Acl.User.ofAllUsers(), Acl.Role.READER));
    // the inputstream is closed by default, so we don't need to close it here
    Blob blob =
        storage.create(
            BlobInfo.newBuilder(BUCKET_NAME, fileName).setAcl(acls).build(),
            filePart.getInputStream());

    // return the public download link
    resp.getWriter().print(blob.getMediaLink());
  }
}

Versão 8 

@SuppressWarnings("serial")
@WebServlet(name = "upload", value = "/upload")
@MultipartConfig()
public class UploadServlet extends HttpServlet {

  private static final String BUCKET_NAME = System.getenv("BUCKET_NAME");
  private static Storage storage = null;

  @Override
  public void init() {
    storage = StorageOptions.getDefaultInstance().getService();
  }

  @Override
  public void doPost(HttpServletRequest req, HttpServletResponse resp)
      throws IOException, ServletException {
    final Part filePart = req.getPart("file");
    final String fileName = filePart.getSubmittedFileName();

    // Modify access list to allow all users with link to read file
    List<Acl> acls = new ArrayList<>();
    acls.add(Acl.of(Acl.User.ofAllUsers(), Acl.Role.READER));
    // the inputstream is closed by default, so we don't need to close it here
    Blob blob =
        storage.create(
            BlobInfo.newBuilder(BUCKET_NAME, fileName).setAcl(acls).build(),
            filePart.getInputStream());

    // return the public download link
    resp.getWriter().print(blob.getMediaLink());
  }
}

Node.js

O aplicativo de amostra apresenta uma página da Web que solicita ao usuário um arquivo para armazenar no Cloud Storage. Depois que o usuário seleciona o arquivo e clica em enviar, o gerenciador de upload carrega o conteúdo do arquivo em um blob e o salva no Cloud Storage.

Após o upload do arquivo no Cloud Storage, o URL público dele é retornado. É possível usá-lo para disponibilizar o arquivo diretamente do Cloud Storage. Armazene esse valor no app para uso futuro.

const {format} = require('util');
const express = require('express');
const Multer = require('multer');

// By default, the client will authenticate using the service account file
// specified by the GOOGLE_APPLICATION_CREDENTIALS environment variable and use
// the project specified by the GOOGLE_CLOUD_PROJECT environment variable. See
// https://github.com/GoogleCloudPlatform/google-cloud-node/blob/master/docs/authentication.md
// These environment variables are set automatically on Google App Engine
const {Storage} = require('@google-cloud/storage');

// Instantiate a storage client
const storage = new Storage();

const app = express();
app.set('view engine', 'pug');

// This middleware is available in Express v4.16.0 onwards
app.use(express.json());

// Multer is required to process file uploads and make them available via
// req.files.
const multer = Multer({
  storage: Multer.memoryStorage(),
  limits: {
    fileSize: 5 * 1024 * 1024, // no larger than 5mb, you can change as needed.
  },
});

// A bucket is a container for objects (files).
const bucket = storage.bucket(process.env.GCLOUD_STORAGE_BUCKET);

// Display a form for uploading files.
app.get('/', (req, res) => {
  res.render('form.pug');
});

// Process the file upload and upload to Google Cloud Storage.
app.post('/upload', multer.single('file'), (req, res, next) => {
  if (!req.file) {
    res.status(400).send('No file uploaded.');
    return;
  }

  // Create a new blob in the bucket and upload the file data.
  const blob = bucket.file(req.file.originalname);
  const blobStream = blob.createWriteStream();

  blobStream.on('error', err => {
    next(err);
  });

  blobStream.on('finish', () => {
    // The public URL can be used to directly access the file via HTTP.
    const publicUrl = format(
      `https://storage.googleapis.com/${bucket.name}/${blob.name}`
    );
    res.status(200).send(publicUrl);
  });

  blobStream.end(req.file.buffer);
});

const PORT = parseInt(process.env.PORT) || 8080;
app.listen(PORT, () => {
  console.log(`App listening on port ${PORT}`);
  console.log('Press Ctrl+C to quit.');
});

PHP

O aplicativo de amostra apresenta uma página da Web que solicita ao usuário um arquivo para armazenar no Cloud Storage. Depois que o usuário seleciona o arquivo e clica em enviar, o gerenciador de upload carrega o conteúdo do arquivo em um blob e o salva no Cloud Storage.

Após o upload do arquivo no Cloud Storage, o URL público dele é retornado. É possível usá-lo para disponibilizar o arquivo diretamente do Cloud Storage. Armazene esse valor no app para uso futuro.

use DI\Container;
use Google\Cloud\Storage\StorageClient;
use Psr\Http\Message\ServerRequestInterface as Request;
use Psr\Http\Message\ResponseInterface as Response;
use Slim\Factory\AppFactory;

// Create App
AppFactory::setContainer($container = new Container());
$app = AppFactory::create();

// Display errors
$app->addErrorMiddleware(true, true, true);

$container = $app->getContainer();

$app->get('/', function (Request $request, Response $response) use ($container) {
    /** @var Google\Cloud\StorageClient */
    $storage = $container->get('storage');
    $bucketName = $container->get('bucket_name');
    $objectName = $container->get('object_name');
    $bucket = $storage->bucket($bucketName);
    $object = $bucket->object($objectName);
    $content = $object->exists() ? $object->downloadAsString() : '';
    $escapedContent = htmlspecialchars($content);
    $response->getBody()->write(<<<EOF
    <h1>Storage Example</h1>
    <h3>Write [<a href="https://cloud.google.com/appengine/docs/flexible/php/using-cloud-storage">docs</a>]:</h3>
    <form action="/write" method="post">
        Some file content:<br />
        <textarea name="content"></textarea><br />
        <input type="submit" />
    </form>
EOF
    );
    if ($content) {
        $response->getBody()->write(
            "<p><strong>Your content:</strong><p><p>$escapedContent</p>"
        );
    }
    return $response;
});

/**
 * Write to a Storage bucket.
 * @see https://cloud.google.com/appengine/docs/flexible/php/using-cloud-storage
 */
$app->post('/write', function (Request $request, Response $response) use ($container) {
    /** @var Google\Cloud\StorageClient */
    $storage = $container->get('storage');
    $bucketName = $container->get('bucket_name');
    $objectName = $container->get('object_name');
    parse_str((string) $request->getBody(), $postData);
    $metadata = ['contentType' => 'text/plain'];
    $storage->bucket($bucketName)->upload($postData['content'] ?? '', [
        'name' => $objectName,
        'metadata' => $metadata,
    ]);
    return $response
        ->withStatus(302)
        ->withHeader('Location', '/');
});

$container->set('storage', function () use ($container) {
    $projectId = $container->get('project_id');
    $storage = new StorageClient([
        'projectId' => $projectId
    ]);
    return $storage;
});

Python

O aplicativo de amostra apresenta uma página da Web que solicita ao usuário um arquivo para armazenar no Cloud Storage. Quando o usuário seleciona um arquivo e clica em "Enviar", o gerenciador de uploads carrega o conteúdo do arquivo em um blob e o grava no bucket (links em inglês) do Cloud Storage.

Após o upload do arquivo no Cloud Storage, o URL público dele é retornado. É possível usá-lo para disponibilizar o arquivo diretamente do Cloud Storage. Armazene esse valor no app para uso futuro.

v3.8 e posterior 

from __future__ import annotations

import logging
import os

from flask import Flask, request
from google.cloud import storage

app = Flask(__name__)

# Configure this environment variable via app.yaml
CLOUD_STORAGE_BUCKET = os.environ["CLOUD_STORAGE_BUCKET"]

@app.route("/")
def index() -> str:
    return """
<form method="POST" action="/upload" enctype="multipart/form-data">
    <input type="file" name="file">
    <input type="submit">
</form>
"""

@app.route("/upload", methods=["POST"])
def upload() -> str:
    """Process the uploaded file and upload it to Google Cloud Storage."""
    uploaded_file = request.files.get("file")

    if not uploaded_file:
        return "No file uploaded.", 400

    # Create a Cloud Storage client.
    gcs = storage.Client()

    # Get the bucket that the file will be uploaded to.
    bucket = gcs.get_bucket(CLOUD_STORAGE_BUCKET)

    # Create a new blob and upload the file's content.
    blob = bucket.blob(uploaded_file.filename)

    blob.upload_from_string(
        uploaded_file.read(), content_type=uploaded_file.content_type
    )

    # Make the blob public. This is not necessary if the
    # entire bucket is public.
    # See https://cloud.google.com/storage/docs/access-control/making-data-public.
    blob.make_public()

    # The public URL can be used to directly access the uploaded file via HTTP.
    return blob.public_url

@app.errorhandler(500)
def server_error(e: Exception | int) -> str:
    logging.exception("An error occurred during a request.")
    return (
        """
    An internal error occurred: <pre>{}</pre>
    See logs for full stacktrace.
    """.format(
            e
        ),
        500,
    )

if __name__ == "__main__":
    # This is used when running locally. Gunicorn is used to run the
    # application on Google App Engine. See entrypoint in app.yaml.
    app.run(host="127.0.0.1", port=8080, debug=True)

v3.7 e anteriores 

from __future__ import annotations

import logging
import os

from flask import Flask, request
from google.cloud import storage

app = Flask(__name__)

# Configure this environment variable via app.yaml
CLOUD_STORAGE_BUCKET = os.environ["CLOUD_STORAGE_BUCKET"]

@app.route("/")
def index() -> str:
    return """
<form method="POST" action="/upload" enctype="multipart/form-data">
    <input type="file" name="file">
    <input type="submit">
</form>
"""

@app.route("/upload", methods=["POST"])
def upload() -> str:
    """Process the uploaded file and upload it to Google Cloud Storage."""
    uploaded_file = request.files.get("file")

    if not uploaded_file:
        return "No file uploaded.", 400

    # Create a Cloud Storage client.
    gcs = storage.Client()

    # Get the bucket that the file will be uploaded to.
    bucket = gcs.get_bucket(CLOUD_STORAGE_BUCKET)

    # Create a new blob and upload the file's content.
    blob = bucket.blob(uploaded_file.filename)

    blob.upload_from_string(
        uploaded_file.read(), content_type=uploaded_file.content_type
    )

    # Make the blob public. This is not necessary if the
    # entire bucket is public.
    # See https://cloud.google.com/storage/docs/access-control/making-data-public.
    blob.make_public()

    # The public URL can be used to directly access the uploaded file via HTTP.
    return blob.public_url

@app.errorhandler(500)
def server_error(e: Exception | int) -> str:
    logging.exception("An error occurred during a request.")
    return (
        """
    An internal error occurred: <pre>{}</pre>
    See logs for full stacktrace.
    """.format(
            e
        ),
        500,
    )

if __name__ == "__main__":
    # This is used when running locally. Gunicorn is used to run the
    # application on Google App Engine. See entrypoint in app.yaml.
    app.run(host="127.0.0.1", port=8080, debug=True)

Ruby

O aplicativo de amostra apresenta uma página da Web que solicita ao usuário um arquivo para armazenar no Cloud Storage. Depois que o usuário seleciona o arquivo e clica em enviar, o gerenciador de upload carrega o conteúdo do arquivo em um blob e o salva no Cloud Storage.

Após o upload do arquivo no Cloud Storage, o URL público dele é retornado. É possível usá-lo para disponibilizar o arquivo diretamente do Cloud Storage. Armazene esse valor no app para uso futuro.

require "sinatra"
require "google/cloud/storage"

storage = Google::Cloud::Storage.new
bucket  = storage.bucket ENV["GOOGLE_CLOUD_STORAGE_BUCKET"]

get "/" do
  # Present the user with an upload form
  '
    <form method="POST" action="/upload" enctype="multipart/form-data">
      <input type="file" name="file">
      <input type="submit" value="Upload">
    </form>
  '
end

post "/upload" do
  file_path = params[:file][:tempfile].path
  file_name = params[:file][:filename]

  # Upload file to Google Cloud Storage bucket
  file = bucket.create_file file_path, file_name, acl: "public"

  # The public URL can be used to directly access the uploaded file via HTTP
  file.public_url
end

.NET

O aplicativo de amostra apresenta uma página da Web que solicita ao usuário um arquivo para armazenar no Cloud Storage. Depois que o usuário seleciona o arquivo e clica em enviar, o gerenciador de upload carrega o conteúdo do arquivo em um blob e o salva no Cloud Storage.

Após o upload do arquivo no Cloud Storage, o URL público dele é retornado. É possível usá-lo para disponibilizar o arquivo diretamente do Cloud Storage. Armazene esse valor no app para uso futuro.

versão 6 e mais recentes 

    public class HomeController : Controller
    {
        // Contains the bucket name and object name
        readonly CloudStorageOptions _options;
        // The Google Cloud Storage client.
        readonly StorageClient _storage;

        public HomeController(CloudStorageOptions options)
        {
            _options = options;
            _storage = StorageClient.Create();
        }

        [HttpGet]
        public async Task<IActionResult> Index()
        {
            var model = new HomeIndex();
            if (new string[] { null, "", "your-google-bucket-name" }
                .Contains(_options.BucketName))
            {
                model.MissingBucketName = true;
                return View(model);
            }
            try
            {
                // Get the storage object.
                var storageObject =
                    await _storage.GetObjectAsync(_options.BucketName, _options.ObjectName);
                // Get a direct link to the storage object.
                model.MediaLink = storageObject.MediaLink;
                // Download the storage object.
                MemoryStream m = new MemoryStream();
                await _storage.DownloadObjectAsync(
                    _options.BucketName, _options.ObjectName, m);
                m.Seek(0, SeekOrigin.Begin);
                byte[] content = new byte[m.Length];
                m.Read(content, 0, content.Length);
                model.Content = Encoding.UTF8.GetString(content);
            }
            catch (GoogleApiException e)
            when (e.HttpStatusCode == System.Net.HttpStatusCode.NotFound)
            {
                // Does not exist yet.  No problem.
            }
            return View(model);
        }

        [HttpPost]
        public async Task<IActionResult> Index(Form sendForm)
        {
            var model = new HomeIndex();
            // Take the content uploaded in the form and upload it to
            // Google Cloud Storage.
            await _storage.UploadObjectAsync(
                _options.BucketName, _options.ObjectName, "text/plain",
                new MemoryStream(Encoding.UTF8.GetBytes(sendForm.Content)));
            model.Content = sendForm.Content;
            model.SavedNewContent = true;
            var storageObject =
                await _storage.GetObjectAsync(_options.BucketName, _options.ObjectName);
            model.MediaLink = storageObject.MediaLink;
            return View(model);
        }

versão 3.1 e anteriores 

    public class HomeController : Controller
    {
        // Contains the bucket name and object name
        readonly CloudStorageOptions _options;
        // The Google Cloud Storage client.
        readonly StorageClient _storage;

        public HomeController(IOptions<CloudStorageOptions> options)
        {
            _options = options.Value;
            _storage = StorageClient.Create();
        }

        [HttpGet]
        public async Task<IActionResult> Index()
        {
            var model = new HomeIndex();
            if (new string[] { null, "", "your-google-bucket-name" }
                .Contains(_options.BucketName))
            {
                model.MissingBucketName = true;
                return View(model);
            }
            try
            {
                // Get the storage object.
                var storageObject =
                    await _storage.GetObjectAsync(_options.BucketName, _options.ObjectName);
                // Get a direct link to the storage object.
                model.MediaLink = storageObject.MediaLink;
                // Download the storage object.
                MemoryStream m = new MemoryStream();
                await _storage.DownloadObjectAsync(
                    _options.BucketName, _options.ObjectName, m);
                m.Seek(0, SeekOrigin.Begin);
                byte[] content = new byte[m.Length];
                m.Read(content, 0, content.Length);
                model.Content = Encoding.UTF8.GetString(content);
            }
            catch (GoogleApiException e)
            when (e.HttpStatusCode == System.Net.HttpStatusCode.NotFound)
            {
                // Does not exist yet.  No problem.
            }
            return View(model);
        }

        [HttpPost]
        public async Task<IActionResult> Index(Form sendForm)
        {
            var model = new HomeIndex();
            // Take the content uploaded in the form and upload it to
            // Google Cloud Storage.
            await _storage.UploadObjectAsync(
                _options.BucketName, _options.ObjectName, "text/plain",
                new MemoryStream(Encoding.UTF8.GetBytes(sendForm.Content)));
            model.Content = sendForm.Content;
            model.SavedNewContent = true;
            var storageObject =
                await _storage.GetObjectAsync(_options.BucketName, _options.ObjectName);
            model.MediaLink = storageObject.MediaLink;
            return View(model);
        }

Para mais informações

Consulte a documentação do Cloud Storage para informações completas.