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iam.go
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iam.go
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// Copyright 2016 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 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 (
"golang.org/x/net/context"
pb "google.golang.org/genproto/googleapis/iam/v1"
"google.golang.org/grpc"
)
// A Handle provides IAM operations for a resource.
type Handle struct {
c pb.IAMPolicyClient
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 &Handle{
c: pb.NewIAMPolicyClient(conn),
resource: resource,
}
}
// Policy retrieves the IAM policy for the resource.
func (h *Handle) Policy(ctx context.Context) (*Policy, error) {
proto, err := h.c.GetIamPolicy(ctx, &pb.GetIamPolicyRequest{Resource: h.resource})
if err != nil {
return nil, err
}
return &Policy{proto: 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 {
_, err := h.c.SetIamPolicy(ctx, &pb.SetIamPolicyRequest{
Resource: h.resource,
Policy: policy.proto,
})
return err
}
// TestPermissions returns the subset of permissions that the caller has on the resource.
func (h *Handle) TestPermissions(ctx context.Context, permissions []string) ([]string, error) {
res, err := h.c.TestIamPermissions(ctx, &pb.TestIamPermissionsRequest{
Resource: h.resource,
Permissions: permissions,
})
if err != nil {
return nil, err
}
return res.Permissions, nil
}
// 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 {
proto *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.proto == nil {
p.proto = &pb.Policy{}
}
p.proto.Bindings = append(p.proto.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) {
b := p.binding(r)
i := memberIndex(member, b)
if i < 0 {
return
}
// Order doesn't matter, so move the last member into the
// removed spot and shrink the slice.
// TODO(jba): worry about multiple copies of m?
last := len(b.Members) - 1
b.Members[i] = 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.proto == nil {
return nil
}
var rns []RoleName
for _, b := range p.proto.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 {
if p.proto == nil {
return nil
}
for _, b := range p.proto.Bindings {
if b.Role == string(r) {
return b
}
}
return nil
}
// 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
}