visualcaptcha

Node.js NPM package for visualCaptcha's backend service

Installation with NPM

You need Node.js installed with npm.

npm install visualcaptcha

Run tests

Run next command to start mocha unit tests:

npm test

Usage

Initialization

On initialization visualCaptcha function requires req.session session object as first argument:

visualCaptcha = require( 'visualcaptcha' )( req.session, defaultImages, defaultAudios );

Where:

• defaultImages is optional parameter. Defaults to the array inside ./images.json. The path is relative to ./images/
• defaultAudios is optional parameter. Defaults to the array inside ./audios.json. The path is relative to ./audios/

visualCaptcha properties

• session, JSON object — Object that will have a reference for the session object.

It will have .visualCaptcha.images, .visualCaptcha.audios, .visualCaptcha.validImageOption, and .visualCaptcha.validAudioOption.

• imageOptions, array — All the image options.

These can be easily overwritten or extended using addImageOptions( ), or replaceImageOptions( ). By default, they're populated using the ./images.json file.

• audioOptions, array — All the audio options.

These can be easily overwritten or extended using addImageOptions( ), or replaceImageOptions( ). By default, they're populated using the ./audios.json file.

visualCaptcha methods

• generate: function( numberOfOptions ) — Generate a new valid visualCaptcha front-end data. numberOfOptions — is optional parameter for number of generated images, defaults to 5.
• getFrontendData: function() — Get data to be used by the frontend.
• getValidImageOption: function() — Get the current validImageOption.
• getValidAudioOption: function() — Get the current validAudioOption.
• validateImage: function( sentOption ) — Validate the sent image value with the validImageOption.
• validateAudio: function( sentOption ) — Validate the sent audio value with the validAudioOption.
• getImageOptions: function() — Return generated image options.
• getImageOptionAtIndex: function(index) — Return generated image option at index.
• getAudioOption: function() — Alias for getValidAudioOption.
• getAllImageOptions: function() — Return all the image options.
• getAllAudioOptions: function() — Return all the audio options.
• streamAudio: function( response, fileType ) — Stream audio file. Parameters:

- `response` is a [response object](#response-object);
- `fileType` is audio filetype, defaults to `'mp3'`, can also be `'ogg'`.

• streamImage: function( index, response, isRetina ) — Stream image file given an index in the session visualCaptcha images array. Parameters:

- `index` is index of the image in the session images array to send;
- `response` is a [response object](#response-object);
- `isRetina`, boolean, defaults to `false`.

response object

The response object used in .streamAudio(), and .streamImage() was thought of for Express' response object, so it needs:

• .set()
• .write()
• .status()
• .send()
• .end()
• .headerSent (boolean)

License

View the LICENSE file.