/**
* Handles view events for latex files
*
* @param \Hubzero\Filesystem\Collection $collection The file collection to view
* @return void
**/
public function onHandleView(\Hubzero\Filesystem\Collection $collection)
{
if (!$this->canHandle($collection)) {
return false;
}
$file = $collection->findFirstWithExtension('tex');
// Create view
$view = new \Hubzero\Plugin\View(['folder' => 'handlers', 'element' => 'latex', 'name' => 'latex', 'layout' => 'view']);
// Build path for storing temp previews
$outputDir = PATH_APP . DS . trim($this->params->get('compile_dir', 'site/latex/compiled'), DS);
$adapter = Manager::adapter('local', ['path' => $outputDir]);
$uniqid = md5(uniqid());
$temp = File::fromPath($uniqid . '.tex', $adapter);
// Clean up data from Windows characters - important!
$data = preg_replace('/[^(\\x20-\\x7F)\\x0A]*/', '', $file->read());
// Store file locally
$temp->write($data);
// Build the command
$command = DS . trim($this->params->get('texpath', '/usr/bin/pdflatex'), DS);
$command .= ' -output-directory=' . $outputDir . ' -interaction=batchmode ' . escapeshellarg($temp->getAbsolutePath());
// Exec and capture output
exec($command, $out);
$compiled = File::fromPath($uniqid . '.pdf', $adapter);
$log = File::fromPath($uniqid . '.log', $adapter);
if (!$compiled->size()) {
$view->setError(Lang::txt('PLG_HANDLERS_LATEX_ERROR_COMPILE_TEX_FAILED'));
}
// Read log (to show in case of error)
if ($log->size()) {
$view->log = $log->read();
}
$view->compiled = $compiled;
return $view;
}
/**
* Compiles PDF/image preview for any kind of file
*
* @return string
*/
public function compile()
{
// Combine file and folder data
$items = $this->getCollection();
// Incoming
$download = Request::getInt('download', 0);
// Check that we have compile enabled
// @FIXME: why are latex and compiled preview tied together?
// presumedly we are also 'compiling' pdfs?
if (!$this->params->get('latex')) {
$this->setError(Lang::txt('PLG_PROJECTS_FILES_COMPILE_NOTALLOWED'));
return;
}
// Output HTML
$view = new \Hubzero\Plugin\View(['folder' => 'projects', 'element' => 'files', 'name' => 'connected', 'layout' => 'compiled']);
// Make sure we have an item
if (count($items) == 0) {
$view->setError(Lang::txt('PLG_PROJECTS_FILES_ERROR_NO_FILES_TO_COMPILE'));
$view->loadTemplate();
return;
}
// We can only handle one file at a time
$file = $items->first();
// Build path for storing temp previews
$imagePath = trim($this->model->config()->get('imagepath', '/site/projects'), DS);
$outputDir = DS . $imagePath . DS . strtolower($this->model->get('alias')) . DS . 'compiled';
// Make sure output dir exists
if (!is_dir(PATH_APP . $outputDir)) {
if (!Filesystem::makeDirectory(PATH_APP . $outputDir)) {
$this->setError(Lang::txt('PLG_PROJECTS_FILES_UNABLE_TO_CREATE_UPLOAD_PATH'));
return;
}
}
// Get LaTeX helper
$compiler = new \Components\Projects\Helpers\Compiler();
// Tex compiler path
$texPath = DS . trim($this->params->get('texpath'), DS);
// Set view args and defaults
$view->file = $file;
$view->oWidth = '780';
$view->oHeight = '460';
$view->url = $this->model->link('files');
$cExt = 'pdf';
// Tex file?
$tex = $compiler->isTexFile($file->getName());
// Build temp name
$tempBase = $tex ? 'temp__' . \Components\Projects\Helpers\Html::takeOutExt($file->getName()) : $file->getName();
$tempBase = str_replace(' ', '_', $tempBase);
$view->data = $file->isImage() ? NULL : $file->read();
// LaTeX file?
if ($tex && !empty($view->data)) {
// Clean up data from Windows characters - important!
$view->data = preg_replace('/[^(\\x20-\\x7F)\\x0A]*/', '', $view->data);
// Store file locally
$tmpfile = PATH_APP . $outputDir . DS . $tempBase;
file_put_contents($tmpfile, $view->data);
// Compile and get path to PDF
$contentFile = $compiler->compileTex($tmpfile, $view->data, $texPath, PATH_APP . $outputDir, 1, $tempBase);
// Read log (to show in case of error)
$logFile = $tempBase . '.log';
if (file_exists(PATH_APP . $outputDir . DS . $logFile)) {
$view->log = Filesystem::read(PATH_APP . $outputDir . DS . $logFile);
}
if (!$contentFile) {
$this->setError(Lang::txt('PLG_PROJECTS_FILES_ERROR_COMPILE_TEX_FAILED'));
}
$cType = Filesystem::mimetype(PATH_APP . $outputDir . DS . $contentFile);
} else {
// Make sure we can handle preview of this type of file
if ($file->hasExtension('pdf') || $file->isImage() || !$file->isBinary()) {
$origin = $this->connection->provider->alias . '://' . $file->getPath();
$dest = 'compiled://' . $tempBase;
// Do the copy
Manager::adapter('local', ['path' => PATH_APP . $outputDir . DS], 'compiled');
Manager::copy($origin, $dest);
$contentFile = $tempBase;
}
}
// Parse output
if (!empty($contentFile) && file_exists(PATH_APP . $outputDir . DS . $contentFile)) {
// Get compiled content mimetype
$cType = Filesystem::mimetype(PATH_APP . $outputDir . DS . $contentFile);
// Is image?
if (strpos($cType, 'image/') !== false) {
// Fix up object width & height
list($width, $height, $type, $attr) = getimagesize(PATH_APP . $outputDir . DS . $contentFile);
$xRatio = $view->oWidth / $width;
$yRatio = $view->oHeight / $height;
if ($xRatio * $height < $view->oHeight) {
// Resize the image based on width
$view->oHeight = ceil($xRatio * $height);
} else {
// Resize the image based on height
$view->oWidth = ceil($yRatio * $width);
}
}
// Download compiled file?
if ($download) {
$pdfName = $tex ? str_replace('temp__', '', basename($contentFile)) : basename($contentFile);
// Serve up file
$server = new \Hubzero\Content\Server();
$server->filename(PATH_APP . $outputDir . DS . $contentFile);
$server->disposition('attachment');
$server->acceptranges(false);
$server->saveas($pdfName);
$result = $server->serve();
if (!$result) {
// Should only get here on error
throw new Exception(Lang::txt('PLG_PROJECTS_FILES_SERVER_ERROR'), 404);
} else {
exit;
}
}
// Generate preview image for browsers that cannot embed pdf
if ($cType == 'application/pdf') {
// GS path
$gspath = trim($this->params->get('gspath'), DS);
if ($gspath && file_exists(DS . $gspath . DS . 'gs')) {
$gspath = DS . $gspath . DS;
$pdfName = $tex ? str_replace('temp__', '', basename($contentFile)) : basename($contentFile);
$pdfPath = PATH_APP . $outputDir . DS . $contentFile;
$exportPath = PATH_APP . $outputDir . DS . $tempBase . '%d.jpg';
exec($gspath . "gs -dNOPAUSE -sDEVICE=jpeg -r300 -dFirstPage=1 -dLastPage=1 -sOutputFile={$exportPath} {$pdfPath} 2>&1", $out);
if (is_file(PATH_APP . $outputDir . DS . $tempBase . '1.jpg')) {
$hi = new \Hubzero\Image\Processor(PATH_APP . $outputDir . DS . $tempBase . '1.jpg');
if (count($hi->getErrors()) == 0) {
$hi->resize($view->oWidth, false, false, true);
$hi->save(PATH_APP . $outputDir . DS . $tempBase . '1.jpg');
} else {
return false;
}
}
if (is_file(PATH_APP . $outputDir . DS . $tempBase . '1.jpg')) {
$image = $tempBase . '1.jpg';
}
}
}
} elseif (!$this->getError()) {
$this->setError(Lang::txt('PLG_PROJECTS_FILES_ERROR_COMPILE_PREVIEW_FAILED'));
}
$view->file = $file;
$view->outputDir = $outputDir;
$view->embed = $contentFile;
$view->cType = $cType;
$view->subdir = $this->subdir;
$view->option = $this->_option;
$view->image = !empty($image) ? $image : NULL;
$view->model = $this->model;
$view->repo = $this->repo;
$view->connection = $this->connection;
if ($this->getError()) {
$view->setError($this->getError());
}
return $view->loadTemplate();
}
/**
* Generates the filesystem adapter for the given provider
*
* @param array $options extra params to include with defaults
* @return object
**/
public function adapter($options = [])
{
$params = (array) json_decode($this->params);
$params = array_merge($params, $options);
return Manager::adapter($this->provider->alias, $params);
}