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<?php |
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declare(strict_types=1); |
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namespace unreal4u\MQTT\Internals; |
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use Psr\Log\LoggerInterface; |
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use unreal4u\MQTT\Exceptions\MessageTooBig; |
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use unreal4u\MQTT\Utilities; |
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/** |
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* Trait WritableContent |
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* @package unreal4u\MQTT\Internals |
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*/ |
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trait WritableContent |
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{ |
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/** |
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* @var LoggerInterface |
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*/ |
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protected $logger; |
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/** |
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* Any special flags that are set on runtime |
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* |
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* PUBLISH for example needs to know QoS, the retain bit and duplicate delivery settings |
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* PUBREL, SUBSCRIBE and UNSUBSCRIBE has always bit 1 set to true |
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* |
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* @var int |
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*/ |
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protected $specialFlags = 0; |
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/** |
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* The protocol version we are talking with. Currently only v3.1.1 is supported |
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* @var string |
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*/ |
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public $protocolLevel = '3.1.1'; |
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/** |
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* Returns the fixed header part needed for all methods |
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* |
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* This takes into account the basic control packet value, any special flags and, in the second byte, the variable |
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* header length |
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* |
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* @param int $variableHeaderLength |
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* @return string |
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* @throws \unreal4u\MQTT\Exceptions\MessageTooBig |
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*/ |
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final public function createFixedHeader(int $variableHeaderLength): string |
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{ |
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$this->logger->debug('Creating fixed header with values', [ |
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'controlPacketValue' => static::CONTROL_PACKET_VALUE, |
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'specialFlags' => $this->specialFlags, |
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'variableHeaderLength' => $variableHeaderLength, |
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'composed' => decbin(\chr((static::CONTROL_PACKET_VALUE << 4) | $this->specialFlags)), |
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]); |
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// Binary OR is safe to do because the first 4 bits are always 0 after shifting |
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return |
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\chr((static::CONTROL_PACKET_VALUE << 4) | $this->specialFlags) . |
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$this->getRemainingLength($variableHeaderLength); |
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} |
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/** |
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* Returns the correct format for the length in bytes of the remaining bytes |
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* |
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* @param int $lengthInBytes |
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* @return string |
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* @throws \unreal4u\MQTT\Exceptions\MessageTooBig |
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*/ |
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final public function getRemainingLength(int $lengthInBytes): string |
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{ |
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if ($lengthInBytes > 268435455) { |
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throw new MessageTooBig('The message cannot exceed 268435455 bytes in length'); |
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} |
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$x = $lengthInBytes; |
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$outputString = ''; |
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do { |
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$encodedByte = $x % 128; |
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$x >>= 7; // Shift 7 bytes |
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// if there are more data to encode, set the top bit of this byte |
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if ($x > 0) { |
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$encodedByte |= 128; |
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} |
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$outputString .= \chr($encodedByte); |
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} while ($x > 0); |
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return $outputString; |
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} |
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/** |
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* Creates the entire message |
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* @return string |
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* @throws \unreal4u\MQTT\Exceptions\MessageTooBig |
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*/ |
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final public function createSendableMessage(): string |
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{ |
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$variableHeader = $this->createVariableHeader(); |
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$this->logger->debug('Creating variable header', ['variableHeader' => base64_encode($variableHeader)]); |
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$payload = $this->createPayload(); |
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$this->logger->debug('Creating payload', ['payload' => base64_encode($payload)]); |
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$fixedHeader = $this->createFixedHeader(mb_strlen($variableHeader . $payload)); |
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$this->logger->debug('Created fixed header', ['fixedHeader' => base64_encode($fixedHeader)]); |
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return $fixedHeader . $variableHeader . $payload; |
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} |
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/** |
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* Gets the current protocol lvl bit |
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* @return string |
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*/ |
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3 |
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final public function getProtocolLevel(): string |
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{ |
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if ($this->protocolLevel === '3.1.1') { |
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return \chr(4); |
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} |
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// Return a default of 0, which will be invalid anyway (but data will be sent to the broker this way) |
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1 |
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return \chr(0); |
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} |
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/** |
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* Creates a UTF8 big-endian representation of the given string |
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* |
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* @param string $data |
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* @return string |
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*/ |
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final public function createUTF8String(string $data): string |
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{ |
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return Utilities::convertNumberToBinaryString(mb_strlen($data)) . $data; |
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} |
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} |
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unreal4u /
mqtt
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