基于Firestore角色的身份验证无法按预期工作

Question

尝试为Android firestore应用启用安全角色

遵循此文件：https://firebase.google.com/docs/firestore/solutions/role-based-access

    service cloud.firestore {
   match /databases/{database}/documents {
     match /Dairy/{dairyId} {
        function isSignedIn() {
          return request.auth != null;
        }

        function getRole() {
          //both of the below statements are not working
          //return resource.data.roles[request.auth.uid];
          return get(/databases/$(database)/documents/Dairy/$(dairyId)).data.roles[request.auth.uid];

        }

        function isOneOfRoles(array) {
          return isSignedIn() && (getRole() in array);
        }

        function isValidNewDoc() {
          return resource.data == null
            && request.resource.data.roles[request.auth.uid] == 'OWNER';
        }

        allow write: if isValidNewDoc() || isOneOfRoles(['OWNER']);

        allow read: if isOneOfRoles(['OWNER', 'ADMIN']);

        match /{document=**} {
          allow read: if isOneOfRoles(['OWNER', 'ADMIN']);
        }
     }

     match /DairyOwnerProfile/{user_profile} {
        function isUserSignedIn() {
          return request.auth != null;
        }

        function isValidNewProfile() {
          // Valid if Dairy does not exist and the new Dairy has the correct owner.
          return isUserSignedIn() && resource.data == null
            && request.resource.data.uid == request.auth.uid;
        }
        allow read, write: if isUserSignedIn() && (user_profile == request.auth.uid || isValidNewProfile());
     }
   }
}

域模型是

创建文档适用于下面的文档模型，其中包含path / databases / {database} / documents / DairyOwnerProfile / {USER_ID}

public class DairyOwnerProfile {
    private String uid;
    private String name;
    private String phone;
    private String dairyId;
}

但是创建和读取不适用于Dairy集合及其所有子集合下面的Dairy模型存储在path / databases / {database} / documents / Dairy / {dairyId}中

public class Dairy {

    private String id;
    private String dairyName;
    private boolean active;
    private String address;
    private Date updateTime;
    private Map<String, Role> roles;
}
public enum Role {
    OWNER, FARMER, ADMIN, MANAGER
}

尝试了几天，但无法弄清楚上面的火库安全规则有什么问题

尝试使用以下变体的isValidNewDoc（）方法

//Not working
function isValidNewDoc() {
    return resource.data == null
            && request.resource.data.roles[request.auth.uid] == 'OWNER';
}

//Not working
function isValidNewDoc() {
          return resource.data == null
            && request.resource.data == null;
}

//Not working
function isValidNewDoc() {
  return resource.data == null
    && request.resource.data != null;
}


//Not working
function isValidNewDoc() {
  return resource.data == null;
}


//working
function isValidNewDoc() {
   return isSignedIn();
}

//Working, Create and update both worked (Sub collection read/write failed)
//but this allows overwriting existing document by another user, adding "resource.data == null" with && causing it to fail
function isValidNewDoc() {
  return request.resource.data.roles[request.auth.uid] == 'OWNER';
}

这是Android studio控制台中出现的错误com.google.firebase.firestore.FirebaseFirestoreException：PERMISSION_DENIED：权限丢失或不足。

我做错了数据的规则或层次是问题

在Dairy集合下有许多子集合，对这些子集合的读/写也失败了

这个问题阻止我的第一个版本的Android应用程序发布，请指出我正确的方向找到并解决问题

注意：这是我第一次使用android和firestore

如果需要更多信息，请告诉我。

Sample Data stored in Forestore without security rule

Answer 1

使用resource == null而不是resource.data == null：

function isValidNewDoc() {
      return resource == null
        && request.resource.data.roles[request.auth.uid] == 'OWNER';
    }