ArcanistChmodLinter.php
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	<?php

	/**
	* Ensures that files are not executable unless they are either binary or
	* contain a shebang.
	*/
	final class ArcanistChmodLinter extends ArcanistLinter {

	const LINT_INVALID_EXECUTABLE = 1;

	public function getInfoName() {
	return 'Chmod';
	}

	public function getInfoDescription() {
	return pht(
	'Checks the permissions on files and ensures that they are not made to '.
	'be executable unnecessarily. In particular, a file should not be '.
	'executable unless it is either binary or contain a shebang.');
	}

	public function getLinterName() {
	return 'CHMOD';
	}

	public function getLinterConfigurationName() {
	return 'chmod';
	}

	public function getLintNameMap() {
	return array(
	self::LINT_INVALID_EXECUTABLE => pht('Invalid Executable'),
	);
	}

	protected function getDefaultMessageSeverity($code) {
	return ArcanistLintSeverity::SEVERITY_WARNING;
	}

	protected function shouldLintBinaryFiles() {
	return true;
	}

	public function lintPath($path) {
	$engine = $this->getEngine();

	if (is_executable($engine->getFilePathOnDisk($path))) {
	if ($engine->isBinaryFile($path)) {
	$mime = Filesystem::getMimeType($engine->getFilePathOnDisk($path));

	switch ($mime) {
	// Archives
	case 'application/jar':
	case 'application/java-archive':
	case 'application/x-bzip2':
	case 'application/x-gzip':
	case 'application/x-rar-compressed':
	case 'application/x-tar':
	case 'application/zip':

	// Audio
	case 'audio/midi':
	case 'audio/mpeg':
	case 'audio/mp4':
	case 'audio/x-wav':

	// Fonts
	case 'application/vnd.ms-fontobject':
	case 'application/x-font-ttf':
	case 'application/x-woff':

	// Images
	case 'application/x-shockwave-flash':
	case 'image/gif':
	case 'image/jpeg':
	case 'image/png':
	case 'image/tiff':
	case 'image/x-icon':
	case 'image/x-ms-bmp':

	// Miscellaneous
	case 'application/msword':
	case 'application/pdf':
	case 'application/postscript':
	case 'application/rtf':
	case 'application/vnd.ms-excel':
	case 'application/vnd.ms-powerpoint':

	// Video
	case 'video/mpeg':
	case 'video/quicktime':
	case 'video/x-flv':
	case 'video/x-msvideo':
	case 'video/x-ms-wmv':

	$this->raiseLintAtPath(
	self::LINT_INVALID_EXECUTABLE,
	pht("'%s' files should not be executable.", $mime));
	return;

	default:
	// Path is a binary file, which makes it a valid executable.
	return;
	}
	} else if ($this->getShebang($path)) {
	// Path contains a shebang, which makes it a valid executable.
	return;
	} else {
	$this->raiseLintAtPath(
	self::LINT_INVALID_EXECUTABLE,
	pht(
	'Executable files should either be binary or contain a shebang.'));
	}
	}
	}

	/**
	* Returns the path's shebang.
	*
	* @param string
	* @return string\|null
	*/
	private function getShebang($path) {
	$line = head(phutil_split_lines($this->getEngine()->loadData($path), true));

	$matches = array();
	if (preg_match('/^#!(.*)$/', $line, $matches)) {
	return $matches[1];
	} else {
	return null;
	}
	}

	}

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