minio/bucket-notification-utils.go

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/*
* Minio Cloud Storage, (C) 2016 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 main
import "strings"
// List of valid event types.
var suppportedEventTypes = map[string]struct{}{
// Object created event types.
"s3:ObjectCreated:*": {},
"s3:ObjectCreated:Put": {},
"s3:ObjectCreated:Post": {},
"s3:ObjectCreated:Copy": {},
"s3:ObjectCreated:CompleteMultipartUpload": {},
// Object removed event types.
"s3:ObjectRemoved:*": {},
"s3:ObjectRemoved:Delete": {},
}
// checkEvent - checks if an event is supported.
func checkEvent(event string) APIErrorCode {
_, ok := suppportedEventTypes[event]
if !ok {
return ErrEventNotification
}
return ErrNone
}
// checkEvents - checks given list of events if all of them are valid.
// given if one of them is invalid, this function returns an error.
func checkEvents(events []string) APIErrorCode {
for _, event := range events {
if s3Error := checkEvent(event); s3Error != ErrNone {
return s3Error
}
}
return ErrNone
}
// Valid if filterName is 'prefix'.
func isValidFilterNamePrefix(filterName string) bool {
return "prefix" == filterName
}
// Valid if filterName is 'suffix'.
func isValidFilterNameSuffix(filterName string) bool {
return "suffix" == filterName
}
// Is this a valid filterName? - returns true if valid.
func isValidFilterName(filterName string) bool {
return isValidFilterNamePrefix(filterName) || isValidFilterNameSuffix(filterName)
}
// checkFilterRules - checks given list of filter rules if all of them are valid.
func checkFilterRules(filterRules []filterRule) APIErrorCode {
ruleSetMap := make(map[string]string)
// Validate all filter rules.
for _, filterRule := range filterRules {
// Unknown filter rule name found, returns an appropriate error.
if !isValidFilterName(filterRule.Name) {
return ErrFilterNameInvalid
}
// Filter names should not be set twice per notification service
// configuration, if found return an appropriate error.
if _, ok := ruleSetMap[filterRule.Name]; ok {
if isValidFilterNamePrefix(filterRule.Name) {
return ErrFilterNamePrefix
} else if isValidFilterNameSuffix(filterRule.Name) {
return ErrFilterNameSuffix
} else {
return ErrFilterNameInvalid
}
}
// Maximum prefix length can be up to 1,024 characters, validate.
if !IsValidObjectPrefix(filterRule.Value) {
return ErrFilterPrefixValueInvalid
}
// Set the new rule name to keep track of duplicates.
ruleSetMap[filterRule.Name] = filterRule.Value
}
// Success all prefixes validated.
return ErrNone
}
// checkQueueArn - check if the queue arn is valid.
func checkQueueArn(queueArn string) APIErrorCode {
if !strings.HasPrefix(queueArn, minioSqs) {
return ErrARNNotification
}
if !strings.HasPrefix(queueArn, minioSqs+serverConfig.GetRegion()+":") {
return ErrRegionNotification
}
return ErrNone
}
// Validate if we recognize the queue type.
func isValidQueue(sqsArn arnMinioSqs) bool {
amqpQ := isAMQPQueue(sqsArn) // Is amqp queue?.
elasticQ := isElasticQueue(sqsArn) // Is elastic queue?.
redisQ := isRedisQueue(sqsArn) // Is redis queue?.
return amqpQ || elasticQ || redisQ
}
// Check - validates queue configuration and returns error if any.
func checkQueueConfig(qConfig queueConfig) APIErrorCode {
// Check queue arn is valid.
if s3Error := checkQueueArn(qConfig.QueueArn); s3Error != ErrNone {
return s3Error
}
// Unmarshals QueueArn into structured object.
sqsArn := unmarshalSqsArn(qConfig.QueueArn)
// Validate if sqsArn requested any of the known supported queues.
if !isValidQueue(sqsArn) {
return ErrARNNotification
}
// Check if valid events are set in queue config.
if s3Error := checkEvents(qConfig.Events); s3Error != ErrNone {
return s3Error
}
// Check if valid filters are set in queue config.
if s3Error := checkFilterRules(qConfig.Filter.Key.FilterRules); s3Error != ErrNone {
return s3Error
}
// Success.
return ErrNone
}
// Validates all incoming queue configs, checkQueueConfig validates if the
// input fields for each queues is not malformed and has valid configuration
// information. If validation fails bucket notifications are not enabled.
func validateQueueConfigs(queueConfigs []queueConfig) APIErrorCode {
for _, qConfig := range queueConfigs {
if s3Error := checkQueueConfig(qConfig); s3Error != ErrNone {
return s3Error
}
}
// Success.
return ErrNone
}
// Validates all the bucket notification configuration for their validity,
// if one of the config is malformed or has invalid data it is rejected.
// Configuration is never applied partially.
func validateNotificationConfig(nConfig notificationConfig) APIErrorCode {
if s3Error := validateQueueConfigs(nConfig.QueueConfigurations); s3Error != ErrNone {
return s3Error
}
// Add validation for other configurations.
return ErrNone
}
// Unmarshals input value of AWS ARN format into minioSqs object.
// Returned value represents minio sqs types, currently supported are
// - amqp
// - elasticsearch
// - redis
func unmarshalSqsArn(queueArn string) (mSqs arnMinioSqs) {
sqsType := strings.TrimPrefix(queueArn, minioSqs+serverConfig.GetRegion()+":")
mSqs = arnMinioSqs{}
switch sqsType {
case queueTypeAMQP:
mSqs.sqsType = queueTypeAMQP
case queueTypeElastic:
mSqs.sqsType = queueTypeElastic
case queueTypeRedis:
mSqs.sqsType = queueTypeRedis
} // Add more cases here.
return mSqs
}