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PhabricatorBotMacroHandler.php
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Fri, May 9, 19:45

PhabricatorBotMacroHandler.php
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<?php
final class PhabricatorBotMacroHandler extends PhabricatorBotHandler {
private $macros;
private $regexp;
private $next = 0;
private function init() {
if ($this->macros === false) {
return false;
}
if ($this->macros !== null) {
return true;
}
$macros = $this->getConduit()->callMethodSynchronous(
'macro.query',
array());
// If we have no macros, cache `false` (meaning "no macros") and return
// immediately.
if (!$macros) {
$this->macros = false;
return false;
}
$regexp = array();
foreach ($macros as $macro_name => $macro) {
$regexp[] = preg_quote($macro_name, '/');
}
$regexp = '/^('.implode('|', $regexp).')\z/';
$this->macros = $macros;
$this->regexp = $regexp;
return true;
}
public function receiveMessage(PhabricatorBotMessage $message) {
if (!$this->init()) {
return;
}
switch ($message->getCommand()) {
case 'MESSAGE':
$message_body = $message->getBody();
$matches = null;
if (!preg_match($this->regexp, trim($message_body), $matches)) {
return;
}
$macro = $matches[1];
$ascii = idx($this->macros[$macro], 'ascii');
if ($ascii === false) {
return;
}
if (!$ascii) {
$this->macros[$macro]['ascii'] = $this->rasterize(
$this->macros[$macro],
$this->getConfig('macro.size', 48),
$this->getConfig('macro.aspect', 0.66));
$ascii = $this->macros[$macro]['ascii'];
}
if ($ascii === false) {
// If we failed to rasterize the macro, bail out.
return;
}
$target_name = $message->getTarget()->getName();
foreach ($ascii as $line) {
$this->replyTo($message, $line);
}
break;
}
}
public function rasterize($macro, $size, $aspect) {
try {
$image = $this->getConduit()->callMethodSynchronous(
'file.download',
array(
'phid' => $macro['filePHID'],
));
$image = base64_decode($image);
} catch (Exception $ex) {
return false;
}
if (!$image) {
return false;
}
$img = @imagecreatefromstring($image);
if (!$img) {
return false;
}
$sx = imagesx($img);
$sy = imagesy($img);
if ($sx > $size || $sy > $size) {
$scale = max($sx, $sy) / $size;
$dx = floor($sx / $scale);
$dy = floor($sy / $scale);
} else {
$dx = $sx;
$dy = $sy;
}
$dy = floor($dy * $aspect);
$dst = imagecreatetruecolor($dx, $dy);
if (!$dst) {
return false;
}
imagealphablending($dst, false);
$ok = imagecopyresampled(
$dst, $img,
0, 0,
0, 0,
$dx, $dy,
$sx, $sy);
if (!$ok) {
return false;
}
$map = array(
' ',
'.',
',',
':',
';',
'!',
'|',
'*',
'=',
'@',
'$',
'#',
);
$lines = array();
for ($ii = 0; $ii < $dy; $ii++) {
$buf = '';
for ($jj = 0; $jj < $dx; $jj++) {
$c = imagecolorat($dst, $jj, $ii);
$a = ($c >> 24) & 0xFF;
$r = ($c >> 16) & 0xFF;
$g = ($c >> 8) & 0xFF;
$b = ($c) & 0xFF;
$luma = (255 - ((0.30 * $r) + (0.59 * $g) + (0.11 * $b))) / 256;
$luma *= ((127 - $a) / 127);
$char = $map[max(0, floor($luma * count($map)))];
$buf .= $char;
}
$lines[] = $buf;
}
return $lines;
}
}

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