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iam_policy_service.go
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iam_policy_service.go
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// Copyright 2021 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
//
// https://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 services
import (
"context"
"sync"
"github.com/golang/protobuf/proto"
iampb "google.golang.org/genproto/googleapis/iam/v1"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
var missingResource error = status.Error(codes.InvalidArgument, "Missing required argument: resource")
var missingPolicy error = status.Error(codes.InvalidArgument, "Missing required argument: policy")
var resourceDoesNotExist error = status.Error(codes.NotFound, "Requested resource has no Policy")
// NewIAMPolicyServer returns a new LocationsServer for the Showcase API.
func NewIAMPolicyServer() iampb.IAMPolicyServer {
return &iamPolicyServerImpl{
policies: map[string]*iampb.Policy{},
}
}
type iamPolicyServerImpl struct {
mu sync.Mutex
// The key is the resource name.
// The value is the IAM Policy assigned to the resource.
policies map[string]*iampb.Policy
}
// GetIamPolicy retrieves the Policy for the named resource, if it has one.
func (i *iamPolicyServerImpl) GetIamPolicy(ctx context.Context, in *iampb.GetIamPolicyRequest) (*iampb.Policy, error) {
if in.GetResource() == "" {
return nil, missingResource
}
i.mu.Lock()
defer i.mu.Unlock()
p, ok := i.policies[in.GetResource()]
if !ok {
return nil, resourceDoesNotExist
}
res := proto.Clone(p)
return res.(*iampb.Policy), nil
}
// SetIamPolicy assigns the given Policy to the resource.
func (i *iamPolicyServerImpl) SetIamPolicy(ctx context.Context, in *iampb.SetIamPolicyRequest) (*iampb.Policy, error) {
if in.GetResource() == "" {
return nil, missingResource
}
if in.GetPolicy() == nil {
return nil, missingPolicy
}
i.mu.Lock()
defer i.mu.Unlock()
clone := proto.Clone(in.GetPolicy())
p := clone.(*iampb.Policy)
i.policies[in.GetResource()] = p
return in.GetPolicy(), nil
}
// TestIamPermissions verifies that the requested resource has been Set at one point, and echoes the back permissions to be tested.
func (i *iamPolicyServerImpl) TestIamPermissions(ctx context.Context, in *iampb.TestIamPermissionsRequest) (*iampb.TestIamPermissionsResponse, error) {
if in.GetResource() == "" {
return nil, missingResource
}
i.mu.Lock()
defer i.mu.Unlock()
if _, ok := i.policies[in.GetResource()]; !ok {
return nil, resourceDoesNotExist
}
return &iampb.TestIamPermissionsResponse{
Permissions: in.GetPermissions(),
}, nil
}