diff options
Diffstat (limited to 'sandbox/testAppNevena/Front/node_modules/ssri/index.js')
| -rw-r--r-- | sandbox/testAppNevena/Front/node_modules/ssri/index.js | 470 |
1 files changed, 0 insertions, 470 deletions
diff --git a/sandbox/testAppNevena/Front/node_modules/ssri/index.js b/sandbox/testAppNevena/Front/node_modules/ssri/index.js deleted file mode 100644 index 2b309849..00000000 --- a/sandbox/testAppNevena/Front/node_modules/ssri/index.js +++ /dev/null @@ -1,470 +0,0 @@ -'use strict' - -const crypto = require('crypto') -const MiniPass = require('minipass') - -const SPEC_ALGORITHMS = ['sha256', 'sha384', 'sha512'] - -// TODO: this should really be a hardcoded list of algorithms we support, -// rather than [a-z0-9]. -const BASE64_REGEX = /^[a-z0-9+/]+(?:=?=?)$/i -const SRI_REGEX = /^([a-z0-9]+)-([^?]+)([?\S*]*)$/ -const STRICT_SRI_REGEX = /^([a-z0-9]+)-([A-Za-z0-9+/=]{44,88})(\?[\x21-\x7E]*)?$/ -const VCHAR_REGEX = /^[\x21-\x7E]+$/ - -const defaultOpts = { - algorithms: ['sha512'], - error: false, - options: [], - pickAlgorithm: getPrioritizedHash, - sep: ' ', - single: false, - strict: false -} - -const ssriOpts = (opts = {}) => ({ ...defaultOpts, ...opts }) - -const getOptString = options => !options || !options.length - ? '' - : `?${options.join('?')}` - -const _onEnd = Symbol('_onEnd') -const _getOptions = Symbol('_getOptions') -class IntegrityStream extends MiniPass { - constructor (opts) { - super() - this.size = 0 - this.opts = opts - - // may be overridden later, but set now for class consistency - this[_getOptions]() - - // options used for calculating stream. can't be changed. - const { algorithms = defaultOpts.algorithms } = opts - this.algorithms = Array.from( - new Set(algorithms.concat(this.algorithm ? [this.algorithm] : [])) - ) - this.hashes = this.algorithms.map(crypto.createHash) - } - - [_getOptions] () { - const { - integrity, - size, - options - } = { ...defaultOpts, ...this.opts } - - // For verification - this.sri = integrity ? parse(integrity, this.opts) : null - this.expectedSize = size - this.goodSri = this.sri ? !!Object.keys(this.sri).length : false - this.algorithm = this.goodSri ? this.sri.pickAlgorithm(this.opts) : null - this.digests = this.goodSri ? this.sri[this.algorithm] : null - this.optString = getOptString(options) - } - - emit (ev, data) { - if (ev === 'end') this[_onEnd]() - return super.emit(ev, data) - } - - write (data) { - this.size += data.length - this.hashes.forEach(h => h.update(data)) - return super.write(data) - } - - [_onEnd] () { - if (!this.goodSri) { - this[_getOptions]() - } - const newSri = parse(this.hashes.map((h, i) => { - return `${this.algorithms[i]}-${h.digest('base64')}${this.optString}` - }).join(' '), this.opts) - // Integrity verification mode - const match = this.goodSri && newSri.match(this.sri, this.opts) - if (typeof this.expectedSize === 'number' && this.size !== this.expectedSize) { - const err = new Error(`stream size mismatch when checking ${this.sri}.\n Wanted: ${this.expectedSize}\n Found: ${this.size}`) - err.code = 'EBADSIZE' - err.found = this.size - err.expected = this.expectedSize - err.sri = this.sri - this.emit('error', err) - } else if (this.sri && !match) { - const err = new Error(`${this.sri} integrity checksum failed when using ${this.algorithm}: wanted ${this.digests} but got ${newSri}. (${this.size} bytes)`) - err.code = 'EINTEGRITY' - err.found = newSri - err.expected = this.digests - err.algorithm = this.algorithm - err.sri = this.sri - this.emit('error', err) - } else { - this.emit('size', this.size) - this.emit('integrity', newSri) - match && this.emit('verified', match) - } - } -} - -class Hash { - get isHash () { return true } - constructor (hash, opts) { - opts = ssriOpts(opts) - const strict = !!opts.strict - this.source = hash.trim() - - // set default values so that we make V8 happy to - // always see a familiar object template. - this.digest = '' - this.algorithm = '' - this.options = [] - - // 3.1. Integrity metadata (called "Hash" by ssri) - // https://w3c.github.io/webappsec-subresource-integrity/#integrity-metadata-description - const match = this.source.match( - strict - ? STRICT_SRI_REGEX - : SRI_REGEX - ) - if (!match) { return } - if (strict && !SPEC_ALGORITHMS.some(a => a === match[1])) { return } - this.algorithm = match[1] - this.digest = match[2] - - const rawOpts = match[3] - if (rawOpts) { - this.options = rawOpts.slice(1).split('?') - } - } - - hexDigest () { - return this.digest && Buffer.from(this.digest, 'base64').toString('hex') - } - - toJSON () { - return this.toString() - } - - toString (opts) { - opts = ssriOpts(opts) - if (opts.strict) { - // Strict mode enforces the standard as close to the foot of the - // letter as it can. - if (!( - // The spec has very restricted productions for algorithms. - // https://www.w3.org/TR/CSP2/#source-list-syntax - SPEC_ALGORITHMS.some(x => x === this.algorithm) && - // Usually, if someone insists on using a "different" base64, we - // leave it as-is, since there's multiple standards, and the - // specified is not a URL-safe variant. - // https://www.w3.org/TR/CSP2/#base64_value - this.digest.match(BASE64_REGEX) && - // Option syntax is strictly visual chars. - // https://w3c.github.io/webappsec-subresource-integrity/#grammardef-option-expression - // https://tools.ietf.org/html/rfc5234#appendix-B.1 - this.options.every(opt => opt.match(VCHAR_REGEX)) - )) { - return '' - } - } - const options = this.options && this.options.length - ? `?${this.options.join('?')}` - : '' - return `${this.algorithm}-${this.digest}${options}` - } -} - -class Integrity { - get isIntegrity () { return true } - toJSON () { - return this.toString() - } - - isEmpty () { - return Object.keys(this).length === 0 - } - - toString (opts) { - opts = ssriOpts(opts) - let sep = opts.sep || ' ' - if (opts.strict) { - // Entries must be separated by whitespace, according to spec. - sep = sep.replace(/\S+/g, ' ') - } - return Object.keys(this).map(k => { - return this[k].map(hash => { - return Hash.prototype.toString.call(hash, opts) - }).filter(x => x.length).join(sep) - }).filter(x => x.length).join(sep) - } - - concat (integrity, opts) { - opts = ssriOpts(opts) - const other = typeof integrity === 'string' - ? integrity - : stringify(integrity, opts) - return parse(`${this.toString(opts)} ${other}`, opts) - } - - hexDigest () { - return parse(this, { single: true }).hexDigest() - } - - // add additional hashes to an integrity value, but prevent - // *changing* an existing integrity hash. - merge (integrity, opts) { - opts = ssriOpts(opts) - const other = parse(integrity, opts) - for (const algo in other) { - if (this[algo]) { - if (!this[algo].find(hash => - other[algo].find(otherhash => - hash.digest === otherhash.digest))) { - throw new Error('hashes do not match, cannot update integrity') - } - } else { - this[algo] = other[algo] - } - } - } - - match (integrity, opts) { - opts = ssriOpts(opts) - const other = parse(integrity, opts) - const algo = other.pickAlgorithm(opts) - return ( - this[algo] && - other[algo] && - this[algo].find(hash => - other[algo].find(otherhash => - hash.digest === otherhash.digest - ) - ) - ) || false - } - - pickAlgorithm (opts) { - opts = ssriOpts(opts) - const pickAlgorithm = opts.pickAlgorithm - const keys = Object.keys(this) - return keys.reduce((acc, algo) => { - return pickAlgorithm(acc, algo) || acc - }) - } -} - -module.exports.parse = parse -function parse (sri, opts) { - if (!sri) return null - opts = ssriOpts(opts) - if (typeof sri === 'string') { - return _parse(sri, opts) - } else if (sri.algorithm && sri.digest) { - const fullSri = new Integrity() - fullSri[sri.algorithm] = [sri] - return _parse(stringify(fullSri, opts), opts) - } else { - return _parse(stringify(sri, opts), opts) - } -} - -function _parse (integrity, opts) { - // 3.4.3. Parse metadata - // https://w3c.github.io/webappsec-subresource-integrity/#parse-metadata - if (opts.single) { - return new Hash(integrity, opts) - } - const hashes = integrity.trim().split(/\s+/).reduce((acc, string) => { - const hash = new Hash(string, opts) - if (hash.algorithm && hash.digest) { - const algo = hash.algorithm - if (!acc[algo]) { acc[algo] = [] } - acc[algo].push(hash) - } - return acc - }, new Integrity()) - return hashes.isEmpty() ? null : hashes -} - -module.exports.stringify = stringify -function stringify (obj, opts) { - opts = ssriOpts(opts) - if (obj.algorithm && obj.digest) { - return Hash.prototype.toString.call(obj, opts) - } else if (typeof obj === 'string') { - return stringify(parse(obj, opts), opts) - } else { - return Integrity.prototype.toString.call(obj, opts) - } -} - -module.exports.fromHex = fromHex -function fromHex (hexDigest, algorithm, opts) { - opts = ssriOpts(opts) - const optString = getOptString(opts.options) - return parse( - `${algorithm}-${ - Buffer.from(hexDigest, 'hex').toString('base64') - }${optString}`, opts - ) -} - -module.exports.fromData = fromData -function fromData (data, opts) { - opts = ssriOpts(opts) - const algorithms = opts.algorithms - const optString = getOptString(opts.options) - return algorithms.reduce((acc, algo) => { - const digest = crypto.createHash(algo).update(data).digest('base64') - const hash = new Hash( - `${algo}-${digest}${optString}`, - opts - ) - /* istanbul ignore else - it would be VERY strange if the string we - * just calculated with an algo did not have an algo or digest. - */ - if (hash.algorithm && hash.digest) { - const algo = hash.algorithm - if (!acc[algo]) { acc[algo] = [] } - acc[algo].push(hash) - } - return acc - }, new Integrity()) -} - -module.exports.fromStream = fromStream -function fromStream (stream, opts) { - opts = ssriOpts(opts) - const istream = integrityStream(opts) - return new Promise((resolve, reject) => { - stream.pipe(istream) - stream.on('error', reject) - istream.on('error', reject) - let sri - istream.on('integrity', s => { sri = s }) - istream.on('end', () => resolve(sri)) - istream.on('data', () => {}) - }) -} - -module.exports.checkData = checkData -function checkData (data, sri, opts) { - opts = ssriOpts(opts) - sri = parse(sri, opts) - if (!sri || !Object.keys(sri).length) { - if (opts.error) { - throw Object.assign( - new Error('No valid integrity hashes to check against'), { - code: 'EINTEGRITY' - } - ) - } else { - return false - } - } - const algorithm = sri.pickAlgorithm(opts) - const digest = crypto.createHash(algorithm).update(data).digest('base64') - const newSri = parse({ algorithm, digest }) - const match = newSri.match(sri, opts) - if (match || !opts.error) { - return match - } else if (typeof opts.size === 'number' && (data.length !== opts.size)) { - const err = new Error(`data size mismatch when checking ${sri}.\n Wanted: ${opts.size}\n Found: ${data.length}`) - err.code = 'EBADSIZE' - err.found = data.length - err.expected = opts.size - err.sri = sri - throw err - } else { - const err = new Error(`Integrity checksum failed when using ${algorithm}: Wanted ${sri}, but got ${newSri}. (${data.length} bytes)`) - err.code = 'EINTEGRITY' - err.found = newSri - err.expected = sri - err.algorithm = algorithm - err.sri = sri - throw err - } -} - -module.exports.checkStream = checkStream -function checkStream (stream, sri, opts) { - opts = ssriOpts(opts) - opts.integrity = sri - sri = parse(sri, opts) - if (!sri || !Object.keys(sri).length) { - return Promise.reject(Object.assign( - new Error('No valid integrity hashes to check against'), { - code: 'EINTEGRITY' - } - )) - } - const checker = integrityStream(opts) - return new Promise((resolve, reject) => { - stream.pipe(checker) - stream.on('error', reject) - checker.on('error', reject) - let sri - checker.on('verified', s => { sri = s }) - checker.on('end', () => resolve(sri)) - checker.on('data', () => {}) - }) -} - -module.exports.integrityStream = integrityStream -function integrityStream (opts = {}) { - return new IntegrityStream(opts) -} - -module.exports.create = createIntegrity -function createIntegrity (opts) { - opts = ssriOpts(opts) - const algorithms = opts.algorithms - const optString = getOptString(opts.options) - - const hashes = algorithms.map(crypto.createHash) - - return { - update: function (chunk, enc) { - hashes.forEach(h => h.update(chunk, enc)) - return this - }, - digest: function (enc) { - const integrity = algorithms.reduce((acc, algo) => { - const digest = hashes.shift().digest('base64') - const hash = new Hash( - `${algo}-${digest}${optString}`, - opts - ) - /* istanbul ignore else - it would be VERY strange if the hash we - * just calculated with an algo did not have an algo or digest. - */ - if (hash.algorithm && hash.digest) { - const algo = hash.algorithm - if (!acc[algo]) { acc[algo] = [] } - acc[algo].push(hash) - } - return acc - }, new Integrity()) - - return integrity - } - } -} - -const NODE_HASHES = new Set(crypto.getHashes()) - -// This is a Best Effort™ at a reasonable priority for hash algos -const DEFAULT_PRIORITY = [ - 'md5', 'whirlpool', 'sha1', 'sha224', 'sha256', 'sha384', 'sha512', - // TODO - it's unclear _which_ of these Node will actually use as its name - // for the algorithm, so we guesswork it based on the OpenSSL names. - 'sha3', - 'sha3-256', 'sha3-384', 'sha3-512', - 'sha3_256', 'sha3_384', 'sha3_512' -].filter(algo => NODE_HASHES.has(algo)) - -function getPrioritizedHash (algo1, algo2) { - return DEFAULT_PRIORITY.indexOf(algo1.toLowerCase()) >= DEFAULT_PRIORITY.indexOf(algo2.toLowerCase()) - ? algo1 - : algo2 -} |