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335 lines
8.8 KiB
335 lines
8.8 KiB
// Copyright 2014 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package storage
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import (
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"net/http"
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"reflect"
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"cloud.google.com/go/internal/trace"
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"golang.org/x/net/context"
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"google.golang.org/api/googleapi"
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raw "google.golang.org/api/storage/v1"
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)
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// ACLRole is the level of access to grant.
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type ACLRole string
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const (
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RoleOwner ACLRole = "OWNER"
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RoleReader ACLRole = "READER"
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RoleWriter ACLRole = "WRITER"
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)
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// ACLEntity refers to a user or group.
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// They are sometimes referred to as grantees.
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//
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// It could be in the form of:
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// "user-<userId>", "user-<email>", "group-<groupId>", "group-<email>",
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// "domain-<domain>" and "project-team-<projectId>".
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//
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// Or one of the predefined constants: AllUsers, AllAuthenticatedUsers.
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type ACLEntity string
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const (
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AllUsers ACLEntity = "allUsers"
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AllAuthenticatedUsers ACLEntity = "allAuthenticatedUsers"
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)
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// ACLRule represents a grant for a role to an entity (user, group or team) for a
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// Google Cloud Storage object or bucket.
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type ACLRule struct {
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Entity ACLEntity
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EntityID string
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Role ACLRole
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Domain string
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Email string
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ProjectTeam *ProjectTeam
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}
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// ProjectTeam is the project team associated with the entity, if any.
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type ProjectTeam struct {
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ProjectNumber string
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Team string
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}
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// ACLHandle provides operations on an access control list for a Google Cloud Storage bucket or object.
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type ACLHandle struct {
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c *Client
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bucket string
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object string
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isDefault bool
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userProject string // for requester-pays buckets
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}
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// Delete permanently deletes the ACL entry for the given entity.
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func (a *ACLHandle) Delete(ctx context.Context, entity ACLEntity) (err error) {
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ctx = trace.StartSpan(ctx, "cloud.google.com/go/storage.ACL.Delete")
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defer func() { trace.EndSpan(ctx, err) }()
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if a.object != "" {
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return a.objectDelete(ctx, entity)
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}
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if a.isDefault {
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return a.bucketDefaultDelete(ctx, entity)
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}
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return a.bucketDelete(ctx, entity)
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}
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// Set sets the role for the given entity.
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func (a *ACLHandle) Set(ctx context.Context, entity ACLEntity, role ACLRole) (err error) {
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ctx = trace.StartSpan(ctx, "cloud.google.com/go/storage.ACL.Set")
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defer func() { trace.EndSpan(ctx, err) }()
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if a.object != "" {
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return a.objectSet(ctx, entity, role, false)
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}
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if a.isDefault {
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return a.objectSet(ctx, entity, role, true)
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}
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return a.bucketSet(ctx, entity, role)
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}
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// List retrieves ACL entries.
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func (a *ACLHandle) List(ctx context.Context) (rules []ACLRule, err error) {
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ctx = trace.StartSpan(ctx, "cloud.google.com/go/storage.ACL.List")
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defer func() { trace.EndSpan(ctx, err) }()
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if a.object != "" {
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return a.objectList(ctx)
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}
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if a.isDefault {
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return a.bucketDefaultList(ctx)
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}
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return a.bucketList(ctx)
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}
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func (a *ACLHandle) bucketDefaultList(ctx context.Context) ([]ACLRule, error) {
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var acls *raw.ObjectAccessControls
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var err error
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err = runWithRetry(ctx, func() error {
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req := a.c.raw.DefaultObjectAccessControls.List(a.bucket)
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a.configureCall(req, ctx)
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acls, err = req.Do()
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return err
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})
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if err != nil {
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return nil, err
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}
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return toObjectACLRules(acls.Items), nil
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}
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func (a *ACLHandle) bucketDefaultDelete(ctx context.Context, entity ACLEntity) error {
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return runWithRetry(ctx, func() error {
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req := a.c.raw.DefaultObjectAccessControls.Delete(a.bucket, string(entity))
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a.configureCall(req, ctx)
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return req.Do()
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})
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}
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func (a *ACLHandle) bucketList(ctx context.Context) ([]ACLRule, error) {
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var acls *raw.BucketAccessControls
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var err error
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err = runWithRetry(ctx, func() error {
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req := a.c.raw.BucketAccessControls.List(a.bucket)
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a.configureCall(req, ctx)
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acls, err = req.Do()
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return err
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})
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if err != nil {
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return nil, err
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}
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return toBucketACLRules(acls.Items), nil
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}
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func (a *ACLHandle) bucketSet(ctx context.Context, entity ACLEntity, role ACLRole) error {
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acl := &raw.BucketAccessControl{
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Bucket: a.bucket,
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Entity: string(entity),
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Role: string(role),
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}
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err := runWithRetry(ctx, func() error {
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req := a.c.raw.BucketAccessControls.Update(a.bucket, string(entity), acl)
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a.configureCall(req, ctx)
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_, err := req.Do()
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return err
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})
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if err != nil {
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return err
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}
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return nil
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}
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func (a *ACLHandle) bucketDelete(ctx context.Context, entity ACLEntity) error {
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return runWithRetry(ctx, func() error {
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req := a.c.raw.BucketAccessControls.Delete(a.bucket, string(entity))
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a.configureCall(req, ctx)
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return req.Do()
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})
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}
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func (a *ACLHandle) objectList(ctx context.Context) ([]ACLRule, error) {
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var acls *raw.ObjectAccessControls
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var err error
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err = runWithRetry(ctx, func() error {
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req := a.c.raw.ObjectAccessControls.List(a.bucket, a.object)
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a.configureCall(req, ctx)
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acls, err = req.Do()
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return err
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})
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if err != nil {
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return nil, err
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}
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return toObjectACLRules(acls.Items), nil
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}
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func (a *ACLHandle) objectSet(ctx context.Context, entity ACLEntity, role ACLRole, isBucketDefault bool) error {
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type setRequest interface {
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Do(opts ...googleapi.CallOption) (*raw.ObjectAccessControl, error)
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Header() http.Header
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}
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acl := &raw.ObjectAccessControl{
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Bucket: a.bucket,
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Entity: string(entity),
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Role: string(role),
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}
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var req setRequest
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if isBucketDefault {
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req = a.c.raw.DefaultObjectAccessControls.Update(a.bucket, string(entity), acl)
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} else {
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req = a.c.raw.ObjectAccessControls.Update(a.bucket, a.object, string(entity), acl)
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}
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a.configureCall(req, ctx)
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return runWithRetry(ctx, func() error {
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_, err := req.Do()
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return err
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})
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}
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func (a *ACLHandle) objectDelete(ctx context.Context, entity ACLEntity) error {
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return runWithRetry(ctx, func() error {
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req := a.c.raw.ObjectAccessControls.Delete(a.bucket, a.object, string(entity))
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a.configureCall(req, ctx)
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return req.Do()
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})
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}
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func (a *ACLHandle) configureCall(call interface{ Header() http.Header }, ctx context.Context) {
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vc := reflect.ValueOf(call)
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vc.MethodByName("Context").Call([]reflect.Value{reflect.ValueOf(ctx)})
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if a.userProject != "" {
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vc.MethodByName("UserProject").Call([]reflect.Value{reflect.ValueOf(a.userProject)})
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}
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setClientHeader(call.Header())
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}
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func toObjectACLRules(items []*raw.ObjectAccessControl) []ACLRule {
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var rs []ACLRule
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for _, item := range items {
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rs = append(rs, toObjectACLRule(item))
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}
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return rs
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}
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func toBucketACLRules(items []*raw.BucketAccessControl) []ACLRule {
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var rs []ACLRule
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for _, item := range items {
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rs = append(rs, toBucketACLRule(item))
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}
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return rs
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}
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func toObjectACLRule(a *raw.ObjectAccessControl) ACLRule {
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return ACLRule{
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Entity: ACLEntity(a.Entity),
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EntityID: a.EntityId,
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Role: ACLRole(a.Role),
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Domain: a.Domain,
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Email: a.Email,
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ProjectTeam: toObjectProjectTeam(a.ProjectTeam),
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}
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}
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func toBucketACLRule(a *raw.BucketAccessControl) ACLRule {
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return ACLRule{
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Entity: ACLEntity(a.Entity),
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EntityID: a.EntityId,
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Role: ACLRole(a.Role),
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Domain: a.Domain,
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Email: a.Email,
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ProjectTeam: toBucketProjectTeam(a.ProjectTeam),
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}
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}
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func toRawObjectACL(rules []ACLRule) []*raw.ObjectAccessControl {
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if len(rules) == 0 {
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return nil
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}
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r := make([]*raw.ObjectAccessControl, 0, len(rules))
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for _, rule := range rules {
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r = append(r, rule.toRawObjectAccessControl("")) // bucket name unnecessary
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}
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return r
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}
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func toRawBucketACL(rules []ACLRule) []*raw.BucketAccessControl {
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if len(rules) == 0 {
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return nil
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}
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r := make([]*raw.BucketAccessControl, 0, len(rules))
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for _, rule := range rules {
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r = append(r, rule.toRawBucketAccessControl("")) // bucket name unnecessary
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}
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return r
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}
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func (r ACLRule) toRawBucketAccessControl(bucket string) *raw.BucketAccessControl {
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return &raw.BucketAccessControl{
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Bucket: bucket,
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Entity: string(r.Entity),
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Role: string(r.Role),
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// The other fields are not settable.
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}
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}
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func (r ACLRule) toRawObjectAccessControl(bucket string) *raw.ObjectAccessControl {
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return &raw.ObjectAccessControl{
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Bucket: bucket,
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Entity: string(r.Entity),
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Role: string(r.Role),
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// The other fields are not settable.
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}
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}
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func toBucketProjectTeam(p *raw.BucketAccessControlProjectTeam) *ProjectTeam {
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if p == nil {
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return nil
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}
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return &ProjectTeam{
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ProjectNumber: p.ProjectNumber,
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Team: p.Team,
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}
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}
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func toObjectProjectTeam(p *raw.ObjectAccessControlProjectTeam) *ProjectTeam {
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if p == nil {
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return nil
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}
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return &ProjectTeam{
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ProjectNumber: p.ProjectNumber,
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Team: p.Team,
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}
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}
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