英文:
Firebase Security rules wildcards [syntax version 2] question
问题
我阅读了Firebase安全规则的官方文档。但我遇到了一段难以理解的文本。请确认我是否正确理解了以下引用：
在安全规则的第2版中，递归通配符匹配零个或多个路径项。
match/cities/{city}/{document=**}匹配任何子集合中的文档，以及cities集合中的文档。您必须通过在安全规则顶部添加rules_version = '2'来选择第2版：
rules_version = '2';
service cloud.firestore {
match /databases/{database}/documents {
// 匹配cities集合中的任何文档，以及任何子集合中的文档。
match /cities/{city}/{document=**} {
allow read, write: if <condition>;
}
}
}
这段引用来自这个页面。
问题
如果我正确理解了这个引用：
在安全规则的第2版中，递归通配符匹配零个或多个路径项。
那么这个引用的意思是：match/cities/{city}/{document=**}将匹配到请求中的/cities/LA和/cities/LA/landmarks/landmark1路径。因为在/cities/LA示例中，递归通配符匹配零个路径项，如上述引用所述。
英文:
I read the official documentation of Firebase Security Rules. But I came across a text that was hard to understand. Please confirm if I understood the following quote correctly
> In version 2 of the security rules, recursive wildcards match zero or
> more path items. match/cities/{city}/{document=**} matches documents
> in any subcollections as well as documents in the cities collection.
> You must opt-in to version 2 by adding rules_version = '2'; at the top
> of your security rules:
>
> rules_version = '2';
> service cloud.firestore {
> match /databases/{database}/documents {
> // Matches any document in the cities collection as well as any document
> // in a subcollection.
> match /cities/{city}/{document=**} {
> allow read, write: if <condition>;
> }
> }
> }
This quote from this page
Question
If I understood correctly this quote:
> In version 2 of the security rules, recursive wildcards match zero or
> more path items. match/cities/{city}/{document=**} matches documents
> in any subcollections as well as documents in the cities collection.
That quote means: that match/cities/{city}/{document=**} matches to /cities/LA and /cities/LA/landmarks/landmark1 paths in requests. Because in /cities/LA example recursive wildcards match to zero as said doc quote:
> In version 2 of the security rules, recursive wildcards match zero or
> more path items.
答案1
得分: 1
那句话的意思是：
match/cities/{city}/{document=**与请求中的路径/cities/LA和/cities/LA/landmarks/landmark1匹配。因为在/cities/LA的示例中使用了递归通配符。
是的，这正是它的作用。您可以从 cities 集合中读取文档，还可以从 landmarks 子集合中读取文档。递归通配符意味着您的安全规则将允许您读取来自顶级集合的文档，并会延伸到最深层的子集合。
英文:
> That quote means: that match/cities/{city}/{document=** matches to /cities/LA and /cities/LA/landmarks/landmark1 paths in requests. Because in /cities/LA example recursive wildcards.
Yes, that is exactly what it does. You can read documents from the cities collection, as well as from the landmarks sub-collection. Recursive wildcards mean that your security rules will allow you to read documents from the top-level collection and will fall to the deepest sub-collections.
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