question

en.karam1989 asked May 24, '16

CloudScript CreateSharedGroup if not exists

Dear all:

I'm using CloudScript to implement the friendship requests.

Where a player sends a request to the other, the other should see the requests and choose to accept/ cancel the request.

As mentioned in previous posts, I'm using CloudScript to CreateSharedGroup with SharedGroupId related to the receiver PlayfabId, and store the requests (Sender PlayfabIds) in it.

And then use GetSharedGroupData and UpdateSharedGroupDate for later requests

The problem is:
You can't check if the there is a SharedGroup with id=x or not
(To create a group when it doesn't exist, and update it if it exists)

There is no such method to do it, could you help please.

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brendan answered May 24, '16

Sure thing - the way to do this would be to check for the "InvalidSharedGroupId" error when reading the shared group data via the Server API call. If you see that error, you know that the group does not exist (and so, in this case, should be created).

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en.karam1989 answered May 24, '16

Yes actually I've done it the same way you told, But I think there should be a method to test the existence of a SharedGroupId, better than catching an error to know the absence of it.

Thanks a lot for your response

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brendan answered May 24, '16

I'll add a backlog item for that, but currently, this would be the correct way to test for the existence of a shared group data ID.

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Hamza Lazaar answered May 24, '16

I'm using this code:

try {
createSharedGroup(sharedGroupId);
} catch (e){
if (!undefinedOrNull(e.Error) && e.Error.error === "InvalidSharedGroupId"){
// shared group already exists
} else {
// handler other errors: "native JS ones" or "PlayFab custom ones"
}
}

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Andres Urquijo answered Apr 14, '17

@Brendan I tried doing the error check you are suggesting within the Unity framework. However I'm not getting any errors from GetSharedGroupData calls, even when trying to read from group IDs that surely do not exist (like "randomgroup26").

My current approach is to check the Members list from the result. and if that is empty or null, I create the group.

4

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brendan commented · Apr 14, 2017 at 07:32 PM

To be clear, the error is returned for the Server API call - not the Client API. This is specifically because clients that do not know about a given Shared Group should not be able go "fishing" for valid IDs.

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brendan brendan commented · Apr 14, 2017 at 07:32 PM

I've updated the answer above, to clarify this.

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Andres Urquijo brendan commented · Apr 14, 2017 at 11:04 PM

That makes sense! I'm actually in the process of moving some more of the logic over to cloudscript as it seems to be a better place for what I'm doing anyways (user registration). So that works out for me.

Wouldn't my previous work-around allow you to do that fishing you want to prevent? Thanks for the quick response.

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brendan Andres Urquijo commented · Apr 15, 2017 at 02:29 AM

Our general advice is to never add a player to a Shared Group Data directly, since that gives the client read/write access to the data (allowing a hacked client to write anything at all to it). But if you add players directly, then yes, that would allow people to at least see that the data object exists.

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