Utilities

Format conversions

The \Cobweb\Svconnector\Utility\ConnectorUtility class provides a conversion method utility, which transforms a XML structure into a PHP array without losing any information. This method is simply called as:

$phpArray = \Cobweb\Svconnector\Utility\ConnectorUtility::convertXmlToArray($xml)

Of course one's own conversion method may be used if needed. The conversion from a PHP array to a XML structure can safely rely on TYPO3 CMS API. e.g.:

$xml = '<?xml version="1.0" encoding="utf-8" standalone="yes" ?>' . "\n" . GeneralUtility::array2xml($result);

Again one's own conversion method may be used if needed.

Reading files

The \Cobweb\Svconnector\Utility\FileUtility provides a general method for reading the content of a file, even if that is actually an API endpoint. It will transparently handle the following syntax for pointing to a resource:

• an absolute file path (within the TYPO3 root path or TYPO3_CONF_VARS[BE][lockRootPath]), e.g. /var/foo/web/fileadmin/import/bar.csv
• a file path relative to the TYPO3 root, e.g. fileadmin/import/foo.txt
• a file reference using the EXT: syntax, e.g. EXT:foo/Resources/Private/Data/bar.txt
• a fully qualified URL, e.g. http://www.example.com/foo.txt
• a FAL reference including storage ID and file identifier, e.g. FAL:2:/foo.txt
• a custom syntax, starting with whatever keyword you want, e.g. MYKEY:whatever_you_want

For the latter, you need to implement a "reader" class which will handle this custom reference. This class must inherit from \Cobweb\Svconnector\Utility\AbstractFileReader. It must be declared like a hook, using the custom keyword (without the colon) as a key. Example:

$GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['svconnector']['fileReader']['MYKEY']

The class must implement the read() method, which is expected to return the file's content as a string, or false if some problem happened. An error message about the problem can be reported from within the reader using:

$this->fileUtility->setError('Some reason here');

The read() method receives the full syntax as input (in the above example, MYKEY:whatever_you_want).

Using the \Cobweb\Svconnector\Utility\FileUtility in your own Connector service is very easy. Here is how it's done in the "svconnector_csv" extension

$fileUtility = GeneralUtility::makeInstance(\Cobweb\Svconnector\Utility\FileUtility::class);
$fileContent =  $fileUtility->getFileContent($parameters['filename']);

The getFileContent() method will return false if some error happened reading the file. An error message is available to retrieve using:

$error =  $fileUtility->getError();

If you would rather have the content stored into a (temporary) file rather than returned directly, you can use the getFileAsTemporaryFile(), which will return the full path to the file where the content is stored. It is up to you to read the file and delete it once done:

$fileUtility = GeneralUtility::makeInstance(\Cobweb\Svconnector\Utility\FileUtility::class);
// Get the content stored into a temp file
$filename =  $fileUtility->getFileAsTemporaryFile($parameters['filename']);
// Read from the file
$content = file_get_contents($filename);
// Remove the file
unlink($filename);

Method getFileAsTemporaryFile() will also return false when something went wrong reading the distant data.