.net - Access Gmail's IMAP using AssertionFlowClient and service account -


is possible use assertionflowclient , service account access mailbox of user in domain through imap. same 2-legged oauth 1.0.

here's code:

x509certificate2 certificate =  new x509certificate2(...) authorizationserverdescription server = new authorizationserverdescription {...}; list<string> scope = new list<string> {      "https://mail.google.com/",      "https://www.googleapis.com/auth/userinfo#email" };  assertionflowclient provider = new assertionflowclient(server, certificate) {   serviceaccountid = service_account_email,   scope = string.join(" ",scope.toarray()), };  iauthorizationstate grantedaccess = assertionflowclient.getstate(provider); accesstoken = grantedaccess.accesstoken;  using (imap client = new imap()) {     client.connectssl("imap.gmail.com");     client.loginoauth2("user@mydomain.com", accesstoken);     ... }

i'm able retrieve valid accesstoken accounts.google.com server (although assertionflowclient/dotnetopenauth has bug , use debugger , watch window retrieve it).

i'm sure accesstoken correct, can query www.googleapis.com/userinfo/email api endpoint using - returns same value service_account_email.

gmail's imap server returns following error however:

{"status":"400","schemes":"bearer","scope":"https://mail.google.com/"}

"manage api client access" service account configured "email (read/write/send) https://mail.google.com/" on cpanel.

assertionflowclient/dotnetopenauth bug indicates no-one has ever tried this.

is possible @ all?

so seems google forgot include little detail in documentation:

assertionflowclient provider = new assertionflowclient(server, certificate)     {         serviceaccountid = service_account_email,         scope = "https://mail.google.com/",         serviceaccountuser = "user@mydomain.com",  // <- important     };

it seems requesting access multiple scopes (space separated) fails.


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