thurston

Route-level file type validation for hapi parsed multipart/form-data stream request payloads. Also works as a standalone module, and most importantly, works in tandem with houdin for a truly magical experience.

Table of Contents

• Installation
• Usage
  • async validate(payload, options)
    • Hapi
    • Standalone
• Supported File Types

Installation

Install via NPM.

$ npm install thurston

Usage

async validate(payload, options)

Validates all Stream.Readable values in a payload given a whitelist of file types provided in the options. Throws a joi-like ValidationError if some file type is not allowed or unknown otherwise it returns the original parsed payload.

Hapi

const Hapi = require('hapi');
const Thurston = require('thurston');
 
const server = new Hapi.Server({
    routes: {
        validate: {
            options: {
                whitelist: ['image/png']
            }
        }
    }
});
 
server.route({
    config: {
        validate: {
            // override the default `failAction` if you want further
            // details about the validation error
            failAction: (request, h, err) => {
                // throw the error as is
                throw err;
            },
            payload: Thurston.validate
        },
        payload: {
            output: 'stream',
            parse: true
        }
    }
});

Standalone

const Fs = require('fs');
const Thurston = require('thurston');
 
const options = { whitelist: ['image/png'] };
 
Fs.createWriteStream('file.png').end(Buffer.from('89504e470d0a1a0a', 'hex'));
const png = Fs.createReadStream('file.png');
 
try {
    const payload = await Thurston.validate({ file: png }, options);
    console.log(payload); // { file: ReadStream { _readableState: { ..., buffer: [ <Buffer 89 50> ], ... }, ... } }
}
catch (err) {
    // Unreachable code.
});

const Fs = require('fs');
const Thurston = require('thurston');
 
const options = { whitelist: ['image/png'] };
 
Fs.createWriteStream('file.gif').end(Buffer.from('474946383761', 'hex'));
const gif = Fs.createReadStream('file.gif');
 
try {
    await Thurston.validate({ file: gif }, options);
}
catch (err) {
    console.log(err); // [ValidationError: child "file" fails because ["file" type is not allowed]]
}

Supported File Types

The same as file-type.