8293f546af
This implementation is similar to AMQP notifications: * Notifications are published on a single topic as a JSON feed * Topic is configurable, as is the QoS. Uses the paho.mqtt.golang library for the mqtt connection, and supports connections over tcp and websockets, with optional secure tls support. * Additionally the minio server configuration has been bumped up so mqtt configuration can be added. * Configuration migration code is added with tests. MQTT is an ISO standard M2M/IoT messaging protocol and was originally designed for applications for limited bandwidth networks. Today it's use is growing in the IoT space.
83 lines
2.5 KiB
Go
83 lines
2.5 KiB
Go
/*
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* Copyright (c) 2014 IBM Corp.
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*
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* Seth Hoenig
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* Allan Stockdill-Mander
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* Mike Robertson
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*/
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package mqtt
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import (
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"errors"
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"strings"
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)
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//ErrInvalidQos is the error returned when an packet is to be sent
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//with an invalid Qos value
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var ErrInvalidQos = errors.New("Invalid QoS")
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//ErrInvalidTopicEmptyString is the error returned when a topic string
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//is passed in that is 0 length
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var ErrInvalidTopicEmptyString = errors.New("Invalid Topic; empty string")
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//ErrInvalidTopicMultilevel is the error returned when a topic string
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//is passed in that has the multi level wildcard in any position but
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//the last
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var ErrInvalidTopicMultilevel = errors.New("Invalid Topic; multi-level wildcard must be last level")
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// Topic Names and Topic Filters
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// The MQTT v3.1.1 spec clarifies a number of ambiguities with regard
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// to the validity of Topic strings.
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// - A Topic must be between 1 and 65535 bytes.
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// - A Topic is case sensitive.
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// - A Topic may contain whitespace.
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// - A Topic containing a leading forward slash is different than a Topic without.
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// - A Topic may be "/" (two levels, both empty string).
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// - A Topic must be UTF-8 encoded.
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// - A Topic may contain any number of levels.
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// - A Topic may contain an empty level (two forward slashes in a row).
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// - A TopicName may not contain a wildcard.
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// - A TopicFilter may only have a # (multi-level) wildcard as the last level.
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// - A TopicFilter may contain any number of + (single-level) wildcards.
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// - A TopicFilter with a # will match the absense of a level
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// Example: a subscription to "foo/#" will match messages published to "foo".
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func validateSubscribeMap(subs map[string]byte) ([]string, []byte, error) {
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var topics []string
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var qoss []byte
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for topic, qos := range subs {
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if err := validateTopicAndQos(topic, qos); err != nil {
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return nil, nil, err
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}
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topics = append(topics, topic)
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qoss = append(qoss, qos)
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}
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return topics, qoss, nil
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}
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func validateTopicAndQos(topic string, qos byte) error {
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if len(topic) == 0 {
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return ErrInvalidTopicEmptyString
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}
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levels := strings.Split(topic, "/")
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for i, level := range levels {
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if level == "#" && i != len(levels)-1 {
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return ErrInvalidTopicMultilevel
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}
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}
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if qos < 0 || qos > 2 {
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return ErrInvalidQos
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}
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return nil
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}
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