Dynamic named credentials Salesforce

Question

I need to update the permissions of a Drive document from Salesforce.

I wanted to use Named Credentials, but I didn't find any way of building a call like this one:

https://www.googleapis.com/drive/v3/files/{documentId}/permissions

where {documentId} is a dynamic value.

I've seen that it is possible to add a prefix, but actually even if I create a Named Credential with only https://www.googleapis.com/drive/v3/files, when I call it from my Apex class I get a permission error.

Is there a way to achieve what I would like or I need to change approach?

Thank you

Answer 1

What exactly error are you getting? Salesforce security about not having access to class X? Something about callouts not allowed from triggers? You're sure it works with hardcoded document id?

Should be possible to make the named credential point to https://www.googleapis.com or https://www.googleapis.com/drive/v3/files/ and then add the rest of the endpoint in Apex. If it throws errors - maybe Drive's API is special, you'd need to read up.

String endpoint = 'callout:MyNamedCredential' + '/abc123/permissions';
HttpRequest req = new HttpRequest();
req.setEndpoint(endpoint);
req.setMethod('GET');

I have something like that:

Named credential pointing to https://maps.googleapis.com/maps/api/geocode/json

and then

static final String ENDPOINT = 'callout:GoogleMaps?key={0}&latlng={1}&result_type=premise%7Cstreet_address';
String apiKey = SomeCustomSetting__c.getInstance().GoogleApiKey__c;
String latLng = '60.23,11.17';

req.setEndpoint(String.format(ENDPOINT, new List<String>{apiKey, latLng}));
HttpResponse res = h.send(req);

You could also look into "Files Connect" API I guess.