/*
* Minio Go Library for Amazon S3 Compatible Cloud Storage
* Copyright 2015-2017 Minio, Inc.
*
* 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 minio
import (
"encoding/xml"
"github.com/minio/minio-go/pkg/set"
)
// NotificationEventType is a S3 notification event associated to the bucket notification configuration
type NotificationEventType string
// The role of all event types are described in :
// http://docs.aws.amazon.com/AmazonS3/latest/dev/NotificationHowTo.html#notification-how-to-event-types-and-destinations
const (
ObjectCreatedAll NotificationEventType = "s3:ObjectCreated:*"
ObjectCreatedPut = "s3:ObjectCreated:Put"
ObjectCreatedPost = "s3:ObjectCreated:Post"
ObjectCreatedCopy = "s3:ObjectCreated:Copy"
ObjectCreatedCompleteMultipartUpload = "s3:ObjectCreated:CompleteMultipartUpload"
ObjectAccessedGet = "s3:ObjectAccessed:Get"
ObjectAccessedHead = "s3:ObjectAccessed:Head"
ObjectAccessedAll = "s3:ObjectAccessed:*"
ObjectRemovedAll = "s3:ObjectRemoved:*"
ObjectRemovedDelete = "s3:ObjectRemoved:Delete"
ObjectRemovedDeleteMarkerCreated = "s3:ObjectRemoved:DeleteMarkerCreated"
ObjectReducedRedundancyLostObject = "s3:ReducedRedundancyLostObject"
)
// FilterRule - child of S3Key, a tag in the notification xml which
// carries suffix/prefix filters
type FilterRule struct {
Name string `xml:"Name"`
Value string `xml:"Value"`
}
// S3Key - child of Filter, a tag in the notification xml which
// carries suffix/prefix filters
type S3Key struct {
FilterRules []FilterRule `xml:"FilterRule,omitempty"`
}
// Filter - a tag in the notification xml structure which carries
// suffix/prefix filters
type Filter struct {
S3Key S3Key `xml:"S3Key,omitempty"`
}
// Arn - holds ARN information that will be sent to the web service,
// ARN desciption can be found in http://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html
type Arn struct {
Partition string
Service string
Region string
AccountID string
Resource string
}
// NewArn creates new ARN based on the given partition, service, region, account id and resource
func NewArn(partition, service, region, accountID, resource string) Arn {
return Arn{Partition: partition,
Service: service,
Region: region,
AccountID: accountID,
Resource: resource}
}
// Return the string format of the ARN
func (arn Arn) String() string {
return "arn:" + arn.Partition + ":" + arn.Service + ":" + arn.Region + ":" + arn.AccountID + ":" + arn.Resource
}
// NotificationConfig - represents one single notification configuration
// such as topic, queue or lambda configuration.
type NotificationConfig struct {
ID string `xml:"Id,omitempty"`
Arn Arn `xml:"-"`
Events []NotificationEventType `xml:"Event"`
Filter *Filter `xml:"Filter,omitempty"`
}
// NewNotificationConfig creates one notification config and sets the given ARN
func NewNotificationConfig(arn Arn) NotificationConfig {
return NotificationConfig{Arn: arn, Filter: &Filter{}}
}
// AddEvents adds one event to the current notification config
func (t *NotificationConfig) AddEvents(events ...NotificationEventType) {
t.Events = append(t.Events, events...)
}
// AddFilterSuffix sets the suffix configuration to the current notification config
func (t *NotificationConfig) AddFilterSuffix(suffix string) {
if t.Filter == nil {
t.Filter = &Filter{}
}
newFilterRule := FilterRule{Name: "suffix", Value: suffix}
// Replace any suffix rule if existing and add to the list otherwise
for index := range t.Filter.S3Key.FilterRules {
if t.Filter.S3Key.FilterRules[index].Name == "suffix" {
t.Filter.S3Key.FilterRules[index] = newFilterRule
return
}
}
t.Filter.S3Key.FilterRules = append(t.Filter.S3Key.FilterRules, newFilterRule)
}
// AddFilterPrefix sets the prefix configuration to the current notification config
func (t *NotificationConfig) AddFilterPrefix(prefix string) {
if t.Filter == nil {
t.Filter = &Filter{}
}
newFilterRule := FilterRule{Name: "prefix", Value: prefix}
// Replace any prefix rule if existing and add to the list otherwise
for index := range t.Filter.S3Key.FilterRules {
if t.Filter.S3Key.FilterRules[index].Name == "prefix" {
t.Filter.S3Key.FilterRules[index] = newFilterRule
return
}
}
t.Filter.S3Key.FilterRules = append(t.Filter.S3Key.FilterRules, newFilterRule)
}
// TopicConfig carries one single topic notification configuration
type TopicConfig struct {
NotificationConfig
Topic string `xml:"Topic"`
}
// QueueConfig carries one single queue notification configuration
type QueueConfig struct {
NotificationConfig
Queue string `xml:"Queue"`
}
// LambdaConfig carries one single cloudfunction notification configuration
type LambdaConfig struct {
NotificationConfig
Lambda string `xml:"CloudFunction"`
}
// BucketNotification - the struct that represents the whole XML to be sent to the web service
type BucketNotification struct {
XMLName xml.Name `xml:"NotificationConfiguration"`
LambdaConfigs []LambdaConfig `xml:"CloudFunctionConfiguration"`
TopicConfigs []TopicConfig `xml:"TopicConfiguration"`
QueueConfigs []QueueConfig `xml:"QueueConfiguration"`
}
// AddTopic adds a given topic config to the general bucket notification config
func (b *BucketNotification) AddTopic(topicConfig NotificationConfig) bool {
newTopicConfig := TopicConfig{NotificationConfig: topicConfig, Topic: topicConfig.Arn.String()}
for _, n := range b.TopicConfigs {
// If new config matches existing one
if n.Topic == newTopicConfig.Arn.String() && newTopicConfig.Filter == n.Filter {
existingConfig := set.NewStringSet()
for _, v := range n.Events {
existingConfig.Add(string(v))
}
newConfig := set.NewStringSet()
for _, v := range topicConfig.Events {
newConfig.Add(string(v))
}
if !newConfig.Intersection(existingConfig).IsEmpty() {
return false
}
}
}
b.TopicConfigs = append(b.TopicConfigs, newTopicConfig)
return true
}
// AddQueue adds a given queue config to the general bucket notification config
func (b *BucketNotification) AddQueue(queueConfig NotificationConfig) bool {
newQueueConfig := QueueConfig{NotificationConfig: queueConfig, Queue: queueConfig.Arn.String()}
for _, n := range b.QueueConfigs {
if n.Queue == newQueueConfig.Arn.String() && newQueueConfig.Filter == n.Filter {
existingConfig := set.NewStringSet()
for _, v := range n.Events {
existingConfig.Add(string(v))
}
newConfig := set.NewStringSet()
for _, v := range queueConfig.Events {
newConfig.Add(string(v))
}
if !newConfig.Intersection(existingConfig).IsEmpty() {
return false
}
}
}
b.QueueConfigs = append(b.QueueConfigs, newQueueConfig)
return true
}
// AddLambda adds a given lambda config to the general bucket notification config
func (b *BucketNotification) AddLambda(lambdaConfig NotificationConfig) bool {
newLambdaConfig := LambdaConfig{NotificationConfig: lambdaConfig, Lambda: lambdaConfig.Arn.String()}
for _, n := range b.LambdaConfigs {
if n.Lambda == newLambdaConfig.Arn.String() && newLambdaConfig.Filter == n.Filter {
existingConfig := set.NewStringSet()
for _, v := range n.Events {
existingConfig.Add(string(v))
}
newConfig := set.NewStringSet()
for _, v := range lambdaConfig.Events {
newConfig.Add(string(v))
}
if !newConfig.Intersection(existingConfig).IsEmpty() {
return false
}
}
}
b.LambdaConfigs = append(b.LambdaConfigs, newLambdaConfig)
return true
}
// RemoveTopicByArn removes all topic configurations that match the exact specified ARN
func (b *BucketNotification) RemoveTopicByArn(arn Arn) {
var topics []TopicConfig
for _, topic := range b.TopicConfigs {
if topic.Topic != arn.String() {
topics = append(topics, topic)
}
}
b.TopicConfigs = topics
}
// RemoveQueueByArn removes all queue configurations that match the exact specified ARN
func (b *BucketNotification) RemoveQueueByArn(arn Arn) {
var queues []QueueConfig
for _, queue := range b.QueueConfigs {
if queue.Queue != arn.String() {
queues = append(queues, queue)
}
}
b.QueueConfigs = queues
}
// RemoveLambdaByArn removes all lambda configurations that match the exact specified ARN
func (b *BucketNotification) RemoveLambdaByArn(arn Arn) {
var lambdas []LambdaConfig
for _, lambda := range b.LambdaConfigs {
if lambda.Lambda != arn.String() {
lambdas = append(lambdas, lambda)
}
}
b.LambdaConfigs = lambdas
}