Black Hat GraphQL by Nick Aleks & Dolev Farhi

Author:Nick Aleks & Dolev Farhi [Aleks, Nick & Farhi, Dolev]
Language: eng
Format: epub
ISBN: 9781718502857
Published: 2023-01-23T00:00:00+00:00

This query requests the owner field, and then the owner field’s id (once) and name (four times). As you can see, the height altogether is 5. An application might limit any query that exceeds a certain allowed height. Keep in mind that, by default, GraphQL does not implement this type of control.

Limits on the Number of Returned Records

GraphQL servers could limit the number of objects they return when a client requests an array field. To do so, they could set a maximum number of items to return on the server side and keep the client from overriding it. Here is an example of how this can be achieved in Graphene:

def resolve_pastes(self, info, public=False): query = PasteObject.get_query(info) return query.filter_by(public=public, burn=False).order_by(Paste.id.desc()).limit(100)

This example resolver function is for the pastes query. The limit ensures that no matter how many pastes exist in the database, the maximum number of pastes returned is 1,000.

Another way to limit the number of records returned in a response is by introducing API pagination, which controls the number of records a client can retrieve in a single request.

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