add GDrive provider support (#118)

* GDrive provider support
* More reliable basedir ownership
* Fix mimetype

vendor/google.golang.org/api/internal/creds_test.go

@@ -0,0 +1,87 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package internal
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"golang.org/x/net/context"
+	"golang.org/x/oauth2"
+	"golang.org/x/oauth2/google"
+)
+
+type dummyTokenSource struct {
+	oauth2.TokenSource
+}
+
+func TestTokenSource(t *testing.T) {
+	ctx := context.Background()
+
+	// Pass in a TokenSource, get it back.
+	ts := &dummyTokenSource{}
+	ds := &DialSettings{TokenSource: ts}
+	got, err := Creds(ctx, ds)
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := &google.DefaultCredentials{TokenSource: ts}
+	if !cmp.Equal(got, want) {
+		t.Error("did not get the same TokenSource back")
+	}
+
+	// Load a valid JSON file. No way to really test the contents; we just
+	// verify that there is no error.
+	ds = &DialSettings{CredentialsFile: "service-account.json"}
+	if _, err := Creds(ctx, ds); err != nil {
+		t.Errorf("got %v, wanted no error", err)
+	}
+
+	// If both a file and TokenSource are passed, the file takes precedence
+	// (existing behavior).
+	// TODO(jba): make this an error?
+	ds = &DialSettings{
+		TokenSource:     ts,
+		CredentialsFile: "service-account.json",
+	}
+	got, err = Creds(ctx, ds)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if cmp.Equal(got, want) {
+		t.Error("got the same TokenSource back, wanted one from the JSON file")
+	}
+	// TODO(jba): find a way to test the call to google.DefaultTokenSource.
+}
+
+const validRefeshTokenJSON = `{
+  "client_id": "764-aaaaa.apps.googleusercontent.com",
+  "client_secret": "d-988888888",
+  "refresh_token": "1/88888aaaaaaaaa",
+  "type": "authorized_user"
+}`
+
+const validServiceAccountJSON = `{
+  "type": "service_account",
+  "project_id": "dumba-504",
+  "private_key_id": "adsfsdd",
+  "private_key": "-----BEGIN PRIVATE KEY-----\n\n-----END PRIVATE KEY-----\n",
+  "client_email": "dumba-504@appspot.gserviceaccount.com",
+  "client_id": "111",
+  "auth_uri": "https://accounts.google.com/o/oauth2/auth",
+  "token_uri": "https://accounts.google.com/o/oauth2/token",
+  "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
+  "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/dumba-504%40appspot.gserviceaccount.com"
+}`