我无法使Firebase Storage使用自定义规则和自定义声明。
在“ Python管理”面板中,我执行以下操作来创建用户并分配声明client_id:
# Standard Auth
import firebase_admin
from firebase_admin import db, storage, auth
cred = firebase_admin.credentials.Certificate('path_to_cert_json')
app = firebase_admin.initialize_app(cred, 'config')
bucket = storage.bucket(app=app)
# Create User
auth.create_user(email=email)
# Create custom claims
auth.set_custom_user_claims(uid, {'client_id': client_id})
然后针对Firebase规则,当文件位于具有client_id的子文件夹中时,我尝试允许用户仅读取(或下载)文件:
存储中的文件结构:
/{environment}/{client_id}/other_folders_and_files
我设置了以下存储规则:
service firebase.storage {
match /b/{bucket}/o {
match /{environment}/{client_id}/{allPaths=**} {
allow read: if request.auth.token.client_id == client_id
}
}
}
但是,这给了我一个错误,即权限被拒绝。
我在做什么错了?
注意:
答案 0 :(得分:2)
如果我没记错,那么您使用的是这个错误。应该是:
service firebase.storage {
match /b/{bucket}/o {
match /{environment}/{client_id}/{allPaths=**} {
allow read: if request.auth.uid == client_id
}
}
}
令牌返回其他对象,例如:
因此,为了能够比较用户ID,必须使用request.auth.uid
。这种方式将比较cliente客户ID。如果您想看看docs,request.auth
上的一切都来了。
如果您想要自己的自定义令牌,例如:request.auth.token.client_id
,则需要使用Python中的以下代码来实现:
uid = 'some-uid'
additional_claims = {
'client_id': your_custom_client_id
}
custom_token = auth.create_custom_token(uid, additional_claims)
然后您可以在存储规则中使用
service firebase.storage {
match /b/{bucket}/o {
match /{environment}/{client_id}/{allPaths=**} {
allow read: if request.auth.token.client_id == client_id
}
}
}
请参见docs
答案 1 :(得分:0)
自定义声明是目前执行此操作的唯一方法。 规则应如下所示:
service firebase.storage {
match /b/{bucket}/o {
function isAuth() {
return request.auth != null && request.auth.uid != null
}
function isAdmin() {
return isAuth() &&
request.auth.token.admin == true;
}
function clientMatch(clientId) { // expects user's "client" field to be ID of client
return isAuth() &&
clientId == request.auth.token.clientId;
}
match /storage/path/{clientId}/{allPaths=**} {
allow read, write: if isAdmin() || clientMatch(clientId)
}
我们在auth令牌上使用两个自定义字段:admin
和clientId
。
与数据库同步的云功能看起来像这样:
exports.updateUser = functions.firestore
.document('users/{userId}')
.onWrite( async (change, context) => {
// change.before and change.after are DocumentSnapshot objects
const userid=context.params.userId // (from {userId} above)
const isDeleted = !change.after.exists
const isNew = !change.before.exists
let customClaims = {}
if (!isDeleted) {
let newData = change.after.data()
let oldData = change.before.data()
// do we need to update anything?
if (isNew ||
newData.admin !== oldData.admin ||
newData.client !== oldData.client) {
customClaims.admin = Boolean(newData.admin)
customClaims.clientId = newData.client
}
}
else {
let oldData = change.before.data()
customClaims.admin = false
customClaims.clientId = null
}
// now do the update if needed
if (customClaims !== {}) {
// See https://firebase.google.com/docs/reference/admin/node/admin.auth.Auth
await admin.auth().setCustomUserClaims(userid, customClaims)
console.log(`Updating client for ${isNew?"new":"existing"} user ${userid}: ` +
`${JSON.stringify(customClaims)}`)
}
})
可以在对用户文档进行任何更改时运行,并将其同步到auth的自定义声明。
答案 2 :(得分:0)
出于完整性考虑,需要在为用户设置令牌之前创建一个令牌。
因此,完整代码:
uid = 'some-uid'
additional_claims = {
'client_id': your_custom_client_id
}
# First time, only once needed
custom_token = auth.create_custom_token(uid, additional_claims)
# Then
auth.set_custom_user_claims(uid, additional_claims )