Dockerコンテナ(Nodejs)使ってCloudStorageにアクセスしてみる

NodeJS
```
import { Storage } from '@google-cloud/storage';
import { createRequire } from 'module';

const require = createRequire(import.meta.url);
const express = require('express');
const app = express();
//const storage = new Storage({projectId: 'soe-tkmtk-dev-is', keyFilename: './key.json'});
const storage = new Storage();
const bucket = storage.bucket('htkmtk-dev-is-bucket');

async function getMetadata(fileName) {
  // Gets the metadata for the file
  const contents = await bucket.file(fileName).download()
  const [metadata] = await bucket.file(fileName).getMetadata();
  console.log("contents:", contents[0])
  console.log(`Bucket: ${metadata.bucket}`);
  console.log(`CacheControl: ${metadata.cacheControl}`);
  console.log(`ComponentCount: ${metadata.componentCount}`);
  console.log(`ContentDisposition: ${metadata.contentDisposition}`);
  console.log(`ContentEncoding: ${metadata.contentEncoding}`);
  console.log(`ContentLanguage: ${metadata.contentLanguage}`);
  console.log(`ContentType: ${metadata.contentType}`);
  console.log(`CustomTime: ${metadata.customTime}`);
  console.log(`Crc32c: ${metadata.crc32c}`);
  console.log(`ETag: ${metadata.etag}`);
  console.log(`Generation: ${metadata.generation}`);
  console.log(`Id: ${metadata.id}`);
  console.log(`KmsKeyName: ${metadata.kmsKeyName}`);
  console.log(`Md5Hash: ${metadata.md5Hash}`);
  console.log(`MediaLink: ${metadata.mediaLink}`);
  console.log(`Metageneration: ${metadata.metageneration}`);
  console.log(`Name: ${metadata.name}`);
  console.log(`Size: ${metadata.size}`);
  console.log(`StorageClass: ${metadata.storageClass}`);
  console.log(`TimeCreated: ${new Date(metadata.timeCreated)}`);
  console.log(`Last Metadata Update: ${new Date(metadata.updated)}`);
  console.log(`TurboReplication: ${metadata.rpo}`);
  console.log(
    `temporaryHold: ${metadata.temporaryHold ? 'enabled' : 'disabled'}`
  );
  console.log(
    `eventBasedHold: ${metadata.eventBasedHold ? 'enabled' : 'disabled'}`
  );
  if (metadata.retentionExpirationTime) {
    console.log(
      `retentionExpirationTime: ${new Date(metadata.retentionExpirationTime)}`
    );
  }
  if (metadata.metadata) {
    console.log('\n\n\nUser metadata:');
    for (const key in metadata.metadata) {
      console.log(`${key}=${metadata.metadata[key]}`);
    }
  }
}

async function listFiles() {
  // Lists files in the bucket
  const [files] = await bucket.getFiles();
  
  console.log('Files:');
  files.forEach(file => {
    console.log(file.name);
    getMetadata(file.name);
  });
}

app.get('/', (req, res) => {
  listFiles().catch(console.error);
  const name = process.env.NAME || 'World';
  res.send(`Hello new ${name}!`);
});

const port = parseInt(process.env.PORT) || 8080;
app.listen(port, () => {
  console.log(`helloworld: listening on port ${port}`);
});
```

Dockerfile
```
FROM node:16.15.1-slim

# アプリケーションディレクトリを作成する
COPY . /app/
WORKDIR /app/
EXPOSE 8080

ENTRYPOINT [ "node", "index.js" ]
```
package.json
```
{
    "name": "helloworld",
    "description": "Simple hello world sample in Node",
    "version": "1.0.0",
    "private": true,
    "type": "module",
    "main": "index.js",
    "scripts": {
      "start": "node index.js"
    },
    "engines": {
      "node": ">=12.0.0"
    },
    "author": "Google LLC",
    "license": "Apache-2.0",
    "dependencies": {
      "express": "^4.17.1"
    }
  }
```