reallydangerous

NodeJS port of the Python itsdangerous module

Features

• Timestamp signer with custom epoch support
• Reduce signature length by striping trailing “=” automatically
• Similar output to python itsdangerous
• Web-safe format (convert “+” to “-” and “/” to “_”)
• Built-in web-safe Base64 encoder/decoder

Installation

You can install this package via NPM: npm install reallydangerous

Usage

Signer

const RD = require('reallydangerous');
const signer = new RD.Signer('my-secret');

console.log(signer.sign('test'));
// 'test.c_1GcJ_PKrUqi7gx_0uP1rRAHMk'
console.log(signer.unsign('test.c_1GcJ_PKrUqi7gx_0uP1rRAHMk'));
// 'test'

new RD.Signer(secret[, salt, sep, key_derivation, digest_method, algorithm])

• secret {String} Secret to be used (Defaults to ‘my-secret’)
• salt {String} Salt to be used for key generation (Defaults to ‘itsDangerous.Signer’)
• sep {String} Separator to be used for token. Only characters not inside the base64 alphabet are supported.
• key_derivation {String} Similar to the python module. Available options are ‘concat’, ‘hmac’, ‘none’ and ‘django-concat’ (default)
• digest_method {String} Hashing function type to be used for hash calculation. Supported values include any hashing function from nodejs crypto library.
• algorithm {Class} Algorithm class instance used for signatures with the methods ‘get_signature’ and ‘verify_signature’

signer.derive_key()

Returns a Node.js Buffer of the generated key.

signer.get_signature(value)

• value {String} Input to get signature of

Returns signature of value as string

signer.sign(value)

• value {String} The value to be signed

Returns signed string

signer.unsign(data)

• data {String} Signed value

Returns original value if signature is correct, else throw BadSignature error

TimestampSigner

const RD = require('reallydangerous');
const signer = new RD.TimestampSigner('my-secret');

console.log(signer.sign('test'));
// 'test.XTxTRw.dXVJz1MsFiapD0GQ5a16bHjOq2M'
console.log(signer.unsign('test.XTxTRw.dXVJz1MsFiapD0GQ5a16bHjOq2M'));
// 'test'
console.log(signer.unsign('test.XTxTRw.dXVJz1MsFiapD0GQ5a16bHjOq2M'), 0, true);
// ['test', 1564234567]

new RD.TimestampSigner(secret[, salt, sep, key_derivation, digest_method, algorithm])

• secret {String} Secret to be used (Defaults to ‘my-secret’)
• salt {String} Salt to be used for key generation (Defaults to ‘itsdangerous.Signer’)
• sep {String} Separator to be used for token. Only characters not inside the base64 alphabet are supported.
• key_derivation {String} Similar to the python module. Available options are ‘concat’, ‘hmac’, ‘none’ and ‘django-concat’ (default)
• digest_method {String} Hashing function type to be used for hash calculation. Supported values include any hashing function from nodejs crypto library.
• algorithm {Class} Algorithm class to sign and requires the methods ‘get_signature’ and ‘verify_signature’

signer.set_epoch(epoch)

• epoch {Number|String} Epoch to use for signing/unsigning in seconds

signer.get_epoch()

Returns current epoch as a number

signer.sign(value)

• value {String} The value to be signed

Returns signed string with timestamp

signer.unsign(data[, max_age, return_timestamp])

• data {String} Signed value
• max_age {Number} Max age time in milliseconds. Default to 0 which is no expiry.
• return_timestamp {Boolean} Whether the timestamp should be returned. Defaults to ‘false’

Returns original value if signature is correct and age is less than max_age (if defined), else throw BadTimeSignature error. Returns an array of the original value and the timestamp without epoch if ‘return_timestamp’ is set to true.

signer.get_timestamp()

Returns current timestamp in seconds

Web-safe Base64 encode/decode

const RD = require('reallydangerous');

console.log(RD.Base64.encode('test'));
// 'dGVzdA'
console.log(RD.Base64.decode('dGVzdA'));
// 'test'

Base64.encode(data)

• data {String|Buffer} Data to be encoded in web-safe format

Returns web-safe base64 encoded string

Base64.decode(payload, buffer)

• payload {String} Encoded base64 to be decoded
• buffer {Boolean} Set to true to return a buffer instead of a string

Returns the data buffer if the buffer parameter is true otherwise the original data string