shared-helpers/database.rules.json at main · FabricElements/shared-helpers · GitHub

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{
  "rules": {
    "user-status":{
			"$uid": {
          ".read": "auth != null",
          ".write": true,
      	}
    	},
    // Chat rules
    "chats": {
      "groups": {
        ".write": true,
        ".read": true,
        ".indexOn": "users",
        "$group": {
          ".indexOn": "users",
          // any member can read the list of member names
          "users": {
            "$uid": {

            }
          }
        }
      },
      "messages": {
        "$group": {
          ".read": "root.child('chats/groups/'+$group+'/users/'+auth.uid).exists()",
          ".indexOn": "timestamp/created",
          "$message": {
            ".write": "data.child('user/uid').val() === auth.uid || newData.child('user/uid').val() === auth.uid && root.child('chats/groups/'+$group+'/users/'+auth.uid).exists()",
          }
        }
      },
      "users": {
				"$uid": {
          ".read": "auth.uid === $uid",
        }
      }
    },
    // other rules
  }
}