add GDrive provider support (#118)

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

vendor/cloud.google.com/go/iam/admin/apiv1/policy_methods.go

@@ -0,0 +1,52 @@
+// Copyright 2016 Google LLC
+//
+// 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.
+
+// This is handwritten code. These methods are implemented by hand so they can use
+// the iam.Policy type.
+
+package admin
+
+import (
+	"cloud.google.com/go/iam"
+	"golang.org/x/net/context"
+	iampb "google.golang.org/genproto/googleapis/iam/v1"
+)
+
+// GetIamPolicy returns the IAM access control policy for a ServiceAccount.
+func (c *IamClient) GetIamPolicy(ctx context.Context, req *iampb.GetIamPolicyRequest) (*iam.Policy, error) {
+	policy, err := c.getIamPolicy(ctx, req)
+	if err != nil {
+		return nil, err
+	}
+	return &iam.Policy{InternalProto: policy}, nil
+}
+
+// SetIamPolicyRequest is the request type for the SetIamPolicy method.
+type SetIamPolicyRequest struct {
+	Resource string
+	Policy   *iam.Policy
+}
+
+// SetIamPolicy sets the IAM access control policy for a ServiceAccount.
+func (c *IamClient) SetIamPolicy(ctx context.Context, req *SetIamPolicyRequest) (*iam.Policy, error) {
+	preq := &iampb.SetIamPolicyRequest{
+		Resource: req.Resource,
+		Policy:   req.Policy.InternalProto,
+	}
+	policy, err := c.setIamPolicy(ctx, preq)
+	if err != nil {
+		return nil, err
+	}
+	return &iam.Policy{InternalProto: policy}, nil
+}