gcloud-node-如何确保通过签名URL上传到Google Cloud Storage的文件是公开可读的? [英] gcloud-node - How do I ensure that files uploaded to Google Cloud Storage via signed URLs are publicly readable?
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问题描述
我想允许客户端(浏览器中的JavaScript)将文件上传到Google Cloud Storage,目前,我通过生成
I want to allow clients (JavaScript in browser) to upload files to Google Cloud Storage, something I currently accomplish by generating signed URLs. However, the uploaded files are private by default. How can I ensure that files uploaded via signed URLs are publicly readable?
推荐答案
Controlling file ACLs is handled via the header x-goog-acl, which must also be included when calculating the signed URL. For public readability, use the value public-read
.
let request = new XMLHttpRequest()
request.onreadystatechange = () => {
if (request.readyState === XMLHttpRequest.DONE) {
if (request.status === 200) {
console.log(`Google Cloud Storage upload was successful:`, request.responseText)
} else {
console.log(`Google Cloud Storage upload was not successful: ${request.status}`)
}
}
}
request.open('PUT', signedUrl, true)
// Don't care about content-type header for signature calculation
request.setRequestHeader('content-type', 'ignore')
request.setRequestHeader('x-goog-acl', 'public-read')
request.send(file)
示例服务器端代码(用于获取签名的URL):
let gcloud = require('gcloud')
let moment = require('moment')
let gcs = gcloud.storage({
projectId: process.env.GCLOUD_PROJECT_ID,
credentials: {
client_email: process.env.GCLOUD_CLIENT_EMAIL,
private_key: process.env.GCLOUD_PRIVATE_KEY,
},
})
let bucket = gcs.bucket('aBucket')
let cloudFile = bucket.file('aFile')
cloudFile.getSignedUrl({
action: 'write',
expires: moment.utc().add(1, 'days').format(),
contentType: 'ignore',
extensionHeaders: {'x-goog-acl': 'public-read',},
}, (error, signedUrl) => {
if (error != null) {
console.log(`Failed to obtain signed URL for file`)
} else {
console.log(`Got signed URL for file: ${signedUrl}`)
}
})
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