Allow read in FireStore rules based on timestamp value in document

user_3448221 0
Viewed 7865

I want to create a FireStore rule that grantes read privilages to documents after the current date has surpassed a timestamp value in the document.

This is for a blog web application. E.G a blogger sets a blog post to be available to the public on a certain date.

From reading the documentation this should work, but It dosn't.

service cloud.firestore {
  match /databases/{database}/documents {
    match /Articles/{article}{
   allow read: if request.time.date() < resource.data.date
    }
  }
}

What I am i missing ??

firebase-security google-cloud-firestore firebase
5 Answers

firebaser here

I tried the same thing a while ago, and found out it isn't currently possible.

It is possible to allow/deny read to a specific document based on a property of that document.

It is possible to allow a query that filters documents based on a property in that document, but currently that is only possible based on request.auth.

This means that unfortunately your filter currently can't be implemented with security rules. I recommend you file a feature request to chime in.

Update (2018-04-24): this might now be possible with request.time, but I haven't had a chance to test yet. Have a look here.

user_2091030

NOTE: As this is my first answer on Stack Overflow, I wasn't allowed to comment on Frank van Pueffelen's answer, so just as a heads-up, the credits for this solution are his!

The request has a request.time which is a timestamp, and Firestore allows for basic math operators on timestamp <> timestamp operations, so your request.time < resource.data.date will work ;)

service cloud.firestore {
  match /databases/{database}/documents {
    match /Articles/{article}{
   allow read: if request.time < resource.data.date
    }
  }
}

This is based on my personal testing on 2018.09.29

user_104336470

trying switching the < to >.

request.time will be the time of accessing the document while resource.data.date should be the creation timestamp of the document.

try using this for your security rules:

    allow read: if request.time > (resource.data.timestampPropertyName + duration.time(1, 0, 0, 0));

duration.time(4, 3, 2, 1) will create a four hour, three minute, two second, one nanosecond duration.

More information can be found at: https://firebase.google.com/docs/firestore/reference/security/#timestamp

Do remember to wait for sometime after saving your security rules for it to take effect!

user_7769140

Answer of @user776914 is nice but what if there are diff timezones

Lets add +- 27 hours to be sure it was e.g. created in that day +- 1

duration.abs(request.time - request.resource.data.created) < duration.value(27, 'h')

What's max timezone offset

user_52791560

I wanted to do a similar thing for a game. I wanted to activate and deactivate a game object only after a particular date. I used google's cloud functions to do it. I deployed a function that runs every day to check the firestore documents and changes values according to the script.

user_128762390
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