// TODO: Create the storage client
// The Storage(...) factory function accepts an options
// object which is used to specify which project's Cloud
// Storage buckets should be used via the projectId
// property.
// The projectId is retrieved from the config module.
// This module retrieves the project ID from the
// GCLOUD_PROJECT environment variable.
const storage = new Storage({
projectId: config.get('GCLOUD_PROJECT')
});
// END TODO
// TODO: Get the GCLOUD_BUCKET environment variable
// Recall that earlier you exported the bucket name into an
// environment variable.
// The config module provides access to this environment
// variable so you can use it in code
const GCLOUD_BUCKET = config.get('GCLOUD_BUCKET');
// END TODO
// TODO: Create a stream to write the file into
// Cloud Storage
// The uploaded file's MIME type can be retrieved using
// req.file.mimetype.
// Cloud Storage metadata can be used for many purposes,
// including establishing the type of an object.
const stream = file.createWriteStream({
metadata: {
contentType: req.file.mimetype
}
});
// END TODO
// TODO: Attach two event handlers (1) error
// Event handler if there's an error when uploading
stream.on('error', err => {
// TODO: If there's an error move to the next handler
next(err);
// END TODO
});
// END TODO
// TODO: Attach two event handlers (2) finish
// The upload completed successfully
stream.on('finish', () => {
// TODO: Make the object publicly accessible
file.makePublic().then(() => {
// TODO: Set a new property on the file for the
// public URL for the object
// Cloud Storage public URLs are in the form:
// https://storage.googleapis.com/[BUCKET]/[OBJECT]
// Use an ECMAScript template literal (`https://...`)to
// populate the URL with appropriate values for the bucket
// ${GCLOUD_BUCKET} and object name ${oname}
req.file.cloudStoragePublicUrl = `https://storage.googleapis.com/${GCLOUD_BUCKET}/${oname}`;
// END TODO
// TODO: Invoke the next middleware handler
next();
// END TODO
});
// END TODO
});
// END TODO
// TODO: End the stream to upload the file's data
stream.end(req.file.buffer);
// END TODO
cloudstorage.js
上記の変更をして、ファイルは次のようになります：
'use strict';
const config = require('../config');
// TODO: Load the module for Cloud Storage
const {Storage} = require('@google-cloud/storage');
// END TODO
// TODO: Create the storage client
// The Storage(...) factory function accepts an options
// object which is used to specify which project's Cloud
// Storage buckets should be used via the projectId
// property.
// The projectId is retrieved from the config module.
// This module retrieves the project ID from the
// GCLOUD_PROJECT environment variable.
const storage = new Storage({
projectId: config.get('GCLOUD_PROJECT')
});
// END TODO
// TODO: Get the GCLOUD_BUCKET environment variable
// Recall that earlier you exported the bucket name into an
// environment variable.
// The config module provides access to this environment
// variable so you can use it in code
const GCLOUD_BUCKET = config.get('GCLOUD_BUCKET');
// END TODO
// TODO: Get a reference to the Cloud Storage bucket
const bucket = storage.bucket(GCLOUD_BUCKET);
// END TODO
// Express middleware that will automatically pass uploads to Cloud Storage.
// req.file is processed and will have a new property:
// * ``cloudStoragePublicUrl`` the public url to the object.
// [START sendUploadToGCS]
function sendUploadToGCS(req, res, next) {
// The existing code in the handler checks to see if there
// is a file property on the HTTP request - if a file has
// been uploaded, then Multer will have created this
// property in the preceding middleware call.
if (!req.file) {
return next();
}
// In addition, a unique object name, oname, has been
// created based on the file's original name. It has a
// prefix generated using the current date and time.
// This should ensure that a new file upload won't
// overwrite an existing object in the bucket
const oname = Date.now() + req.file.originalname;
// TODO: Get a reference to the new object
const file = bucket.file(oname);
// END TODO
// TODO: Create a stream to write the file into
// Cloud Storage
// The uploaded file's MIME type can be retrieved using
// req.file.mimetype.
// Cloud Storage metadata can be used for many purposes,
// including establishing the type of an object.
const stream = file.createWriteStream({
metadata: {
contentType: req.file.mimetype
}
});
// END TODO
// TODO: Attach two event handlers (1) error
// Event handler if there's an error when uploading
stream.on('error', err => {
// TODO: If there's an error move to the next handler
next(err);
// END TODO
});
// END TODO
// TODO: Attach two event handlers (2) finish
// The upload completed successfully
stream.on('finish', () => {
// TODO: Make the object publicly accessible
file.makePublic().then(() => {
// TODO: Set a new property on the file for the
// public URL for the object
// Cloud Storage public URLs are in the form:
// https://storage.googleapis.com/[BUCKET]/[OBJECT]
// Use an ECMAScript template literal (`https://...`)to
// populate the URL with appropriate values for the bucket
// ${GCLOUD_BUCKET} and object name ${oname}
req.file.cloudStoragePublicUrl = `https://storage.googleapis.com/${GCLOUD_BUCKET}/${oname}`;
// END TODO
// TODO: Invoke the next middleware handler
next();
// END TODO
});
// END TODO
});
// END TODO
// TODO: End the stream to upload the file's data
stream.end(req.file.buffer);
// END TODO
}
// [END sendUploadToGCS]
// Multer handles parsing multipart/form-data requests.
// This instance is configured to store images in memory.
// This makes it straightforward to upload to Cloud Storage.
// [START multer]
const Multer = require('multer');
const multer = Multer({
storage: Multer.MemoryStorage,
limits: {
fileSize: 40 * 1024 * 1024 // no larger than 40mb
}
});
// [END multer]
module.exports = {
sendUploadToGCS,
multer
};
