diff options
Diffstat (limited to 'backend/node_modules/jws/lib/verify-stream.js')
-rw-r--r-- | backend/node_modules/jws/lib/verify-stream.js | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/backend/node_modules/jws/lib/verify-stream.js b/backend/node_modules/jws/lib/verify-stream.js new file mode 100644 index 0000000..39f7c73 --- /dev/null +++ b/backend/node_modules/jws/lib/verify-stream.js @@ -0,0 +1,120 @@ +/*global module*/ +var Buffer = require('safe-buffer').Buffer; +var DataStream = require('./data-stream'); +var jwa = require('jwa'); +var Stream = require('stream'); +var toString = require('./tostring'); +var util = require('util'); +var JWS_REGEX = /^[a-zA-Z0-9\-_]+?\.[a-zA-Z0-9\-_]+?\.([a-zA-Z0-9\-_]+)?$/; + +function isObject(thing) { + return Object.prototype.toString.call(thing) === '[object Object]'; +} + +function safeJsonParse(thing) { + if (isObject(thing)) + return thing; + try { return JSON.parse(thing); } + catch (e) { return undefined; } +} + +function headerFromJWS(jwsSig) { + var encodedHeader = jwsSig.split('.', 1)[0]; + return safeJsonParse(Buffer.from(encodedHeader, 'base64').toString('binary')); +} + +function securedInputFromJWS(jwsSig) { + return jwsSig.split('.', 2).join('.'); +} + +function signatureFromJWS(jwsSig) { + return jwsSig.split('.')[2]; +} + +function payloadFromJWS(jwsSig, encoding) { + encoding = encoding || 'utf8'; + var payload = jwsSig.split('.')[1]; + return Buffer.from(payload, 'base64').toString(encoding); +} + +function isValidJws(string) { + return JWS_REGEX.test(string) && !!headerFromJWS(string); +} + +function jwsVerify(jwsSig, algorithm, secretOrKey) { + if (!algorithm) { + var err = new Error("Missing algorithm parameter for jws.verify"); + err.code = "MISSING_ALGORITHM"; + throw err; + } + jwsSig = toString(jwsSig); + var signature = signatureFromJWS(jwsSig); + var securedInput = securedInputFromJWS(jwsSig); + var algo = jwa(algorithm); + return algo.verify(securedInput, signature, secretOrKey); +} + +function jwsDecode(jwsSig, opts) { + opts = opts || {}; + jwsSig = toString(jwsSig); + + if (!isValidJws(jwsSig)) + return null; + + var header = headerFromJWS(jwsSig); + + if (!header) + return null; + + var payload = payloadFromJWS(jwsSig); + if (header.typ === 'JWT' || opts.json) + payload = JSON.parse(payload, opts.encoding); + + return { + header: header, + payload: payload, + signature: signatureFromJWS(jwsSig) + }; +} + +function VerifyStream(opts) { + opts = opts || {}; + var secretOrKey = opts.secret||opts.publicKey||opts.key; + var secretStream = new DataStream(secretOrKey); + this.readable = true; + this.algorithm = opts.algorithm; + this.encoding = opts.encoding; + this.secret = this.publicKey = this.key = secretStream; + this.signature = new DataStream(opts.signature); + this.secret.once('close', function () { + if (!this.signature.writable && this.readable) + this.verify(); + }.bind(this)); + + this.signature.once('close', function () { + if (!this.secret.writable && this.readable) + this.verify(); + }.bind(this)); +} +util.inherits(VerifyStream, Stream); +VerifyStream.prototype.verify = function verify() { + try { + var valid = jwsVerify(this.signature.buffer, this.algorithm, this.key.buffer); + var obj = jwsDecode(this.signature.buffer, this.encoding); + this.emit('done', valid, obj); + this.emit('data', valid); + this.emit('end'); + this.readable = false; + return valid; + } catch (e) { + this.readable = false; + this.emit('error', e); + this.emit('close'); + } +}; + +VerifyStream.decode = jwsDecode; +VerifyStream.isValid = isValidJws; +VerifyStream.verify = jwsVerify; + +module.exports = VerifyStream; |