Google People API: null when listing connections

Question

When using Google.Apis.PeopleService.v1, the people.connections.list method seems to work (no exceptions are thrown) but the returned object always have all its fields set to null. Here is the relevant code:

var scopes = new[] { PeopleServiceService.Scope.ContactsReadonly, PeopleServiceService.ScopeConstants.Contacts };
var credential = GoogleCredential.FromFile("./my-secrets.json")
                                 .CreateScoped(scopes);
var service = new PeopleServiceService(new BaseClientService.Initializer()
{
    HttpClientInitializer = credential,
});

var req = service.People.Connections.List("people/me");
req.PageSize = 2000;
req.RequestMaskIncludeField = "person.names";
req.Fields = "connections,totalItems,nextSyncToken";

var res = await req.ExecuteAsync();
Console.WriteLine(res.Connections.Count); // <-- NullReferenceException

my-secrets.json is the secrets file downloaded from console.developers.google.com. It looks like this:

{
  "type": "service_account",
  "project_id": "",
  "private_key_id": "",
  "private_key": "",
  "client_email": "",
  "client_id": "",
  "auth_uri": "",
  "token_uri": "",
  "auth_provider_x509_cert_url": "",
  "client_x509_cert_url": ""
}

Does someone know what I'm missing ?

Same issue here. I see the name, but the email address is empty. — Nathan B

Chris Chris · Accepted Answer · 2019-10-21T07:59:52

The PeopleService API requires a user credential, not a service credential.

In a locally installed app (e.g. a console app), use GoogleWebAuthorizationBroker.AuthorizeAsync(...) to get one of these.

The request must set req.PersonFields as described here: https://developers.google.com/people/api/rest/v1/people.connections/list#query-parameters E.g. req.PersonFields = "emailAddresses";

It is not necessary to set req.Fields or req.RequestMaskIncludeField.

Google People API: null when listing connections

1 Answers