forked from googleapis/google-cloud-go
-
Notifications
You must be signed in to change notification settings - Fork 0
/
iam.go
292 lines (262 loc) · 8.32 KB
/
iam.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
// 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.
// Package iam supports the resource-specific operations of Google Cloud
// IAM (Identity and Access Management) for the Google Cloud Libraries.
// See https://cloud.google.com/iam for more about IAM.
//
// Users of the Google Cloud Libraries will typically not use this package
// directly. Instead they will begin with some resource that supports IAM, like
// a pubsub topic, and call its IAM method to get a Handle for that resource.
package iam
import (
"context"
"time"
gax "github.com/googleapis/gax-go"
pb "google.golang.org/genproto/googleapis/iam/v1"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
)
// client abstracts the IAMPolicy API to allow multiple implementations.
type client interface {
Get(ctx context.Context, resource string) (*pb.Policy, error)
Set(ctx context.Context, resource string, p *pb.Policy) error
Test(ctx context.Context, resource string, perms []string) ([]string, error)
}
// grpcClient implements client for the standard gRPC-based IAMPolicy service.
type grpcClient struct {
c pb.IAMPolicyClient
}
var withRetry = gax.WithRetry(func() gax.Retryer {
return gax.OnCodes([]codes.Code{
codes.DeadlineExceeded,
codes.Unavailable,
}, gax.Backoff{
Initial: 100 * time.Millisecond,
Max: 60 * time.Second,
Multiplier: 1.3,
})
})
func (g *grpcClient) Get(ctx context.Context, resource string) (*pb.Policy, error) {
var proto *pb.Policy
err := gax.Invoke(ctx, func(ctx context.Context, _ gax.CallSettings) error {
var err error
proto, err = g.c.GetIamPolicy(ctx, &pb.GetIamPolicyRequest{Resource: resource})
return err
}, withRetry)
if err != nil {
return nil, err
}
return proto, nil
}
func (g *grpcClient) Set(ctx context.Context, resource string, p *pb.Policy) error {
return gax.Invoke(ctx, func(ctx context.Context, _ gax.CallSettings) error {
_, err := g.c.SetIamPolicy(ctx, &pb.SetIamPolicyRequest{
Resource: resource,
Policy: p,
})
return err
}, withRetry)
}
func (g *grpcClient) Test(ctx context.Context, resource string, perms []string) ([]string, error) {
var res *pb.TestIamPermissionsResponse
err := gax.Invoke(ctx, func(ctx context.Context, _ gax.CallSettings) error {
var err error
res, err = g.c.TestIamPermissions(ctx, &pb.TestIamPermissionsRequest{
Resource: resource,
Permissions: perms,
})
return err
}, withRetry)
if err != nil {
return nil, err
}
return res.Permissions, nil
}
// A Handle provides IAM operations for a resource.
type Handle struct {
c client
resource string
}
// InternalNewHandle is for use by the Google Cloud Libraries only.
//
// InternalNewHandle returns a Handle for resource.
// The conn parameter refers to a server that must support the IAMPolicy service.
func InternalNewHandle(conn *grpc.ClientConn, resource string) *Handle {
return InternalNewHandleGRPCClient(pb.NewIAMPolicyClient(conn), resource)
}
// InternalNewHandleGRPCClient is for use by the Google Cloud Libraries only.
//
// InternalNewHandleClient returns a Handle for resource using the given
// grpc service that implements IAM as a mixin
func InternalNewHandleGRPCClient(c pb.IAMPolicyClient, resource string) *Handle {
return InternalNewHandleClient(&grpcClient{c: c}, resource)
}
// InternalNewHandleClient is for use by the Google Cloud Libraries only.
//
// InternalNewHandleClient returns a Handle for resource using the given
// client implementation.
func InternalNewHandleClient(c client, resource string) *Handle {
return &Handle{
c: c,
resource: resource,
}
}
// Policy retrieves the IAM policy for the resource.
func (h *Handle) Policy(ctx context.Context) (*Policy, error) {
proto, err := h.c.Get(ctx, h.resource)
if err != nil {
return nil, err
}
return &Policy{InternalProto: proto}, nil
}
// SetPolicy replaces the resource's current policy with the supplied Policy.
//
// If policy was created from a prior call to Get, then the modification will
// only succeed if the policy has not changed since the Get.
func (h *Handle) SetPolicy(ctx context.Context, policy *Policy) error {
return h.c.Set(ctx, h.resource, policy.InternalProto)
}
// TestPermissions returns the subset of permissions that the caller has on the resource.
func (h *Handle) TestPermissions(ctx context.Context, permissions []string) ([]string, error) {
return h.c.Test(ctx, h.resource, permissions)
}
// A RoleName is a name representing a collection of permissions.
type RoleName string
// Common role names.
const (
Owner RoleName = "roles/owner"
Editor RoleName = "roles/editor"
Viewer RoleName = "roles/viewer"
)
const (
// AllUsers is a special member that denotes all users, even unauthenticated ones.
AllUsers = "allUsers"
// AllAuthenticatedUsers is a special member that denotes all authenticated users.
AllAuthenticatedUsers = "allAuthenticatedUsers"
)
// A Policy is a list of Bindings representing roles
// granted to members.
//
// The zero Policy is a valid policy with no bindings.
type Policy struct {
// TODO(jba): when type aliases are available, put Policy into an internal package
// and provide an exported alias here.
// This field is exported for use by the Google Cloud Libraries only.
// It may become unexported in a future release.
InternalProto *pb.Policy
}
// Members returns the list of members with the supplied role.
// The return value should not be modified. Use Add and Remove
// to modify the members of a role.
func (p *Policy) Members(r RoleName) []string {
b := p.binding(r)
if b == nil {
return nil
}
return b.Members
}
// HasRole reports whether member has role r.
func (p *Policy) HasRole(member string, r RoleName) bool {
return memberIndex(member, p.binding(r)) >= 0
}
// Add adds member member to role r if it is not already present.
// A new binding is created if there is no binding for the role.
func (p *Policy) Add(member string, r RoleName) {
b := p.binding(r)
if b == nil {
if p.InternalProto == nil {
p.InternalProto = &pb.Policy{}
}
p.InternalProto.Bindings = append(p.InternalProto.Bindings, &pb.Binding{
Role: string(r),
Members: []string{member},
})
return
}
if memberIndex(member, b) < 0 {
b.Members = append(b.Members, member)
return
}
}
// Remove removes member from role r if it is present.
func (p *Policy) Remove(member string, r RoleName) {
bi := p.bindingIndex(r)
if bi < 0 {
return
}
bindings := p.InternalProto.Bindings
b := bindings[bi]
mi := memberIndex(member, b)
if mi < 0 {
return
}
// Order doesn't matter for bindings or members, so to remove, move the last item
// into the removed spot and shrink the slice.
if len(b.Members) == 1 {
// Remove binding.
last := len(bindings) - 1
bindings[bi] = bindings[last]
bindings[last] = nil
p.InternalProto.Bindings = bindings[:last]
return
}
// Remove member.
// TODO(jba): worry about multiple copies of m?
last := len(b.Members) - 1
b.Members[mi] = b.Members[last]
b.Members[last] = ""
b.Members = b.Members[:last]
}
// Roles returns the names of all the roles that appear in the Policy.
func (p *Policy) Roles() []RoleName {
if p.InternalProto == nil {
return nil
}
var rns []RoleName
for _, b := range p.InternalProto.Bindings {
rns = append(rns, RoleName(b.Role))
}
return rns
}
// binding returns the Binding for the suppied role, or nil if there isn't one.
func (p *Policy) binding(r RoleName) *pb.Binding {
i := p.bindingIndex(r)
if i < 0 {
return nil
}
return p.InternalProto.Bindings[i]
}
func (p *Policy) bindingIndex(r RoleName) int {
if p.InternalProto == nil {
return -1
}
for i, b := range p.InternalProto.Bindings {
if b.Role == string(r) {
return i
}
}
return -1
}
// memberIndex returns the index of m in b's Members, or -1 if not found.
func memberIndex(m string, b *pb.Binding) int {
if b == nil {
return -1
}
for i, mm := range b.Members {
if mm == m {
return i
}
}
return -1
}