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mockiampolicies.go
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mockiampolicies.go
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// Copyright 2023 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.
package mockgcp
import (
"bytes"
"crypto/md5"
"encoding/json"
"fmt"
"io"
"net/http"
"cloud.google.com/go/iam/apiv1/iampb"
"google.golang.org/protobuf/proto"
)
type mockIAMPolicies struct {
policies map[string]*iampb.Policy
}
func newMockIAMPolicies() *mockIAMPolicies {
return &mockIAMPolicies{
policies: make(map[string]*iampb.Policy),
}
}
func (m *mockIAMPolicies) serveGetIAMPolicy(resourcePath string) (*http.Response, error) {
policy := m.policies[resourcePath]
if policy == nil {
policy = &iampb.Policy{}
policy.Version = 3
policy.Etag = computeEtag(policy)
}
b, err := json.Marshal(policy)
if err != nil {
return nil, err
}
body := io.NopCloser(bytes.NewReader(b))
return &http.Response{StatusCode: http.StatusOK, Body: body}, nil
}
func (m *mockIAMPolicies) serveSetIAMPolicy(resourcePath string, httpRequest *http.Request) (*http.Response, error) {
request := &iampb.SetIamPolicyRequest{}
requestBytes, err := io.ReadAll(httpRequest.Body)
if err != nil {
return nil, err
}
if err := json.Unmarshal(requestBytes, request); err != nil {
return nil, err
}
oldPolicy := m.policies[resourcePath]
if oldPolicy == nil {
oldPolicy = &iampb.Policy{}
oldPolicy.Version = 3
oldPolicy.Etag = computeEtag(oldPolicy)
}
if request.Policy.Etag != nil && !bytes.Equal(request.Policy.Etag, oldPolicy.Etag) {
responseBytes := []byte("{}")
responseBody := io.NopCloser(bytes.NewReader(responseBytes))
return &http.Response{StatusCode: http.StatusConflict, Body: responseBody}, nil
}
request.Policy.Version = 3
request.Policy.Etag = computeEtag(request.Policy)
m.policies[resourcePath] = request.Policy
responseBytes, err := json.Marshal(request.Policy)
if err != nil {
return nil, err
}
responseBody := io.NopCloser(bytes.NewReader(responseBytes))
return &http.Response{StatusCode: http.StatusOK, Body: responseBody}, nil
}
func computeEtag(policy *iampb.Policy) []byte {
b, err := proto.Marshal(policy)
if err != nil {
panic(fmt.Sprintf("converting to proto: %v", err))
}
hash := md5.Sum(b)
return hash[:]
}