// validate validates the options.
func (opts *PUBLISHOptions) validate() error {
// Check the QoS.
if !mqtt.ValidQoS(opts.QoS) {
return ErrInvalidQoS
}
// Check the length of the Topic Name.
if len(opts.TopicName) > maxStringsLen {
return ErrTopicNameExceedsMaxStringsLen
}
// Check if the Topic Name contains the wildcard characters.
if bytes.IndexAny(opts.TopicName, wildcards) != -1 {
return ErrTopicNameContainsWildcards
}
// Check the length of the Application Message.
if len(opts.Message) > maxStringsLen {
return ErrMessageExceedsMaxStringsLen
}
// End the validation if the QoS equals to QoS 0.
if opts.QoS == mqtt.QoS0 {
return nil
}
// Check the Packet Identifier.
if opts.PacketID == 0 {
return ErrInvalidPacketID
}
return nil
}
func (opts *CONNECTOptions) validate() error {
// Check the length of the Client Identifier.
if len(opts.ClientID) > maxStringsLen {
return ErrClientIDExceedsMaxStringsLen
}
// Check the combination of the Client Identifier and the Clean Session.
if len(opts.ClientID) == 0 && !opts.CleanSession {
return ErrInvalidClientIDCleanSession
}
// Check the length of the User Name.
if len(opts.UserName) > maxStringsLen {
return ErrUserNameExceedsMaxStringsLen
}
// Check the length of the Password.
if len(opts.Password) > maxStringsLen {
return ErrPasswordExceedsMaxStringsLen
}
// Check the combination of the Client Identifier and the Password.
if len(opts.UserName) == 0 && len(opts.Password) > 0 {
return ErrInvalidClientIDPassword
}
// Check the length of the Will Topic.
if len(opts.WillTopic) > maxStringsLen {
return ErrWillTopicExceedsMaxStringsLen
}
// Check the length of the Will Message.
if len(opts.WillMessage) > maxStringsLen {
return ErrWillMessageExceedsMaxStringsLen
}
// Check the combination of the Will Topic and the Will Message.
if (len(opts.WillTopic) > 0 && len(opts.WillMessage) == 0) || (len(opts.WillTopic) == 0 && len(opts.WillMessage) > 0) {
return ErrInvalidWillTopicMessage
}
// Check the Will QoS.
if !mqtt.ValidQoS(opts.WillQoS) {
return ErrInvalidWillQoS
}
// Check the combination of the Will Topic, the Will Message and the Will QoS.
if len(opts.WillTopic) == 0 && len(opts.WillMessage) == 0 && opts.WillQoS != mqtt.QoS0 {
return ErrInvalidWillTopicMessageQoS
}
// Check the combination of the Will Topic, the Will Message and the Will Retain.
if len(opts.WillTopic) == 0 && len(opts.WillMessage) == 0 && opts.WillRetain {
return ErrInvalidWillTopicMessageRetain
}
return nil
}
// validateSUBACKBytes validates the fixed header and the remaining.
func validateSUBACKBytes(fixedHeader FixedHeader, remaining []byte) error {
// Extract the MQTT Control Packet type.
ptype, err := fixedHeader.ptype()
if err != nil {
return err
}
// Check the length of the fixed header.
if len(fixedHeader) < minLenSUBACKFixedHeader {
return ErrInvalidFixedHeaderLen
}
// Check the MQTT Control Packet type.
if ptype != TypeSUBACK {
return ErrInvalidPacketType
}
// Check the reserved bits of the fixed header.
if fixedHeader[0]<<4 != 0x00 {
return ErrInvalidFixedHeader
}
// Check the length of the remaining.
if len(remaining) < lenSUBACKVariableHeader+1 {
return ErrInvalidRemainingLen
}
// Extract the Packet Identifier.
packetID, _ := decodeUint16(remaining[0:lenSUBACKVariableHeader])
// Check the Packet Identifier.
if packetID == 0 {
return ErrInvalidPacketID
}
// Check each Return Code.
for _, b := range remaining[lenSUBACKVariableHeader:] {
if !mqtt.ValidQoS(b) && b != SUBACKRetFailure {
return ErrInvalidSUBACKReturnCode
}
}
return nil
}
// validate validates the subscription request.
func (s *SubReq) validate() error {
// Check the length of the Topic Filter.
l := len(s.TopicFilter)
if l == 0 {
return ErrNoTopicFilter
}
if l > maxStringsLen {
return ErrTopicFilterExceedsMaxStringsLen
}
// Check the QoS.
if !mqtt.ValidQoS(s.QoS) {
return ErrInvalidQoS
}
return nil
}
// validatePUBLISHBytes validates the fixed header and the variable header.
func validatePUBLISHBytes(fixedHeader FixedHeader, remaining []byte) error {
// Extract the MQTT Control Packet type.
ptype, err := fixedHeader.ptype()
if err != nil {
return err
}
// Check the length of the fixed header.
if len(fixedHeader) < minLenPUBLISHFixedHeader {
return ErrInvalidFixedHeaderLen
}
// Check the MQTT Control Packet type.
if ptype != TypePUBLISH {
return ErrInvalidPacketType
}
// Get the QoS.
qos := (fixedHeader[0] & 0x06) >> 1
// Check the QoS.
if !mqtt.ValidQoS(qos) {
return ErrInvalidQoS
}
// Check the length of the remaining.
if l := len(remaining); l < minLenPUBLISHVariableHeader || l > maxRemainingLength {
return ErrInvalidRemainingLen
}
// Extract the length of the Topic Name.
lenTopicName, _ := decodeUint16(remaining[0:2])
// Calculate the length of the variable header.
var lenVariableHeader int
if qos == mqtt.QoS0 {
lenVariableHeader = 2 + int(lenTopicName)
} else {
lenVariableHeader = 2 + int(lenTopicName) + 2
}
// Check the length of the remaining.
if len(remaining) < lenVariableHeader {
return ErrInvalidRemainingLength
}
// End the validation if the QoS equals to QoS 0.
if qos == mqtt.QoS0 {
return nil
}
// Extract the Packet Identifier.
packetID, _ := decodeUint16(remaining[2+int(lenTopicName) : 2+int(lenTopicName)+2])
// Check the Packet Identifier.
if packetID == 0 {
return ErrInvalidPacketID
}
return nil
}