How to Block Script Uploads in Javascript

Script attacks are a very dangerous threat, claiming a record number of sites as victims this year. One reason for this, is most virus scanning services do not have a means to detect them. This leaves your site wide open for hijacking. Today we are going to plug up this gap in your security by setting up an advanced virus scanning API that has built-in script detection.

First we need to import the client by adding this script tag to the head section of your page:

<script src="https://cdn.cloudmersive.com/jsclient/cloudmersive-virus-client.js"></script>

Now we can call our scanning function. Make sure than allowScripts is set to false, which will cause the API to check each scanned file for scripts and inform you of their presence. Meanwhile we will keep our file upload stored in memory to make sure that it doesn’t cause any harm while the scan takes place.

var CloudmersiveVirusApiClient = require('cloudmersive-virus-api-client');
var defaultClient = CloudmersiveVirusApiClient.ApiClient.instance;
// Configure API key authorization: Apikey
var Apikey = defaultClient.authentications['Apikey'];
Apikey.apiKey = 'YOUR API KEY';
// Uncomment the following line to set a prefix for the API key, e.g. "Token" (defaults to null)
//Apikey.apiKeyPrefix = 'Token';
var apiInstance = new CloudmersiveVirusApiClient.ScanApi();
var inputFile = "/path/to/file"; // File | Input file to perform the operation on.
var opts = {
'allowExecutables': true, // Boolean | Set to false to block executable files (program code) from being allowed in the input file.  Default is false (recommended).
'allowInvalidFiles': true, // Boolean | Set to false to block invalid files, such as a PDF file that is not really a valid PDF file, or a Word Document that is not a valid Word Document.  Default is false (recommended).
'allowScripts': true, // Boolean | Set to false to block script files, such as a PHP files, Pythong scripts, and other malicious content or security threats that can be embedded in the file.  Set to true to allow these file types.  Default is false (recommended).
'allowPasswordProtectedFiles': true, // Boolean | Set to false to block password protected and encrypted files, such as encrypted zip and rar files, and other files that seek to circumvent scanning through passwords.  Set to true to allow these file types.  Default is false (recommended).
'restrictFileTypes': "restrictFileTypes_example" // String | Specify a restricted set of file formats to allow as clean as a comma-separated list of file formats, such as .pdf,.docx,.png would allow only PDF, PNG and Word document files.  All files must pass content verification against this list of file formats, if they do not, then the result will be returned as CleanResult=false.  Set restrictFileTypes parameter to null or empty string to disable; default is disabled.
};
var callback = function(error, data, response) {
if (error) {
console.error(error);
} else {
console.log('API called successfully. Returned data: ' + data);
}
};
apiInstance.scanFileAdvanced(inputFile, opts, callback);

And that’s all, folks! Your page now has cutting edge virus protection against scripts, viruses, and other malicious threats.