forked from Fediversity/fediversity.eu
454 lines
15 KiB
JavaScript
454 lines
15 KiB
JavaScript
'use strict';
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var crypto = require('crypto');
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/**
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* Exported function
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*
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* Options:
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*
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* - `algorithm` hash algo to be used by this instance: *'sha1', 'md5'
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* - `excludeValues` {true|*false} hash object keys, values ignored
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* - `encoding` hash encoding, supports 'buffer', '*hex', 'binary', 'base64'
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* - `ignoreUnknown` {true|*false} ignore unknown object types
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* - `replacer` optional function that replaces values before hashing
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* - `respectFunctionProperties` {*true|false} consider function properties when hashing
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* - `respectFunctionNames` {*true|false} consider 'name' property of functions for hashing
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* - `respectType` {*true|false} Respect special properties (prototype, constructor)
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* when hashing to distinguish between types
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* - `unorderedArrays` {true|*false} Sort all arrays before hashing
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* - `unorderedSets` {*true|false} Sort `Set` and `Map` instances before hashing
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* * = default
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*
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* @param {object} object value to hash
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* @param {object} options hashing options
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* @return {string} hash value
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* @api public
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*/
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exports = module.exports = objectHash;
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function objectHash(object, options){
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options = applyDefaults(object, options);
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return hash(object, options);
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}
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/**
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* Exported sugar methods
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*
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* @param {object} object value to hash
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* @return {string} hash value
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* @api public
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*/
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exports.sha1 = function(object){
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return objectHash(object);
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};
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exports.keys = function(object){
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return objectHash(object, {excludeValues: true, algorithm: 'sha1', encoding: 'hex'});
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};
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exports.MD5 = function(object){
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return objectHash(object, {algorithm: 'md5', encoding: 'hex'});
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};
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exports.keysMD5 = function(object){
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return objectHash(object, {algorithm: 'md5', encoding: 'hex', excludeValues: true});
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};
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// Internals
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var hashes = crypto.getHashes ? crypto.getHashes().slice() : ['sha1', 'md5'];
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hashes.push('passthrough');
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var encodings = ['buffer', 'hex', 'binary', 'base64'];
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function applyDefaults(object, sourceOptions){
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sourceOptions = sourceOptions || {};
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// create a copy rather than mutating
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var options = {};
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options.algorithm = sourceOptions.algorithm || 'sha1';
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options.encoding = sourceOptions.encoding || 'hex';
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options.excludeValues = sourceOptions.excludeValues ? true : false;
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options.algorithm = options.algorithm.toLowerCase();
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options.encoding = options.encoding.toLowerCase();
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options.ignoreUnknown = sourceOptions.ignoreUnknown !== true ? false : true; // default to false
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options.respectType = sourceOptions.respectType === false ? false : true; // default to true
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options.respectFunctionNames = sourceOptions.respectFunctionNames === false ? false : true;
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options.respectFunctionProperties = sourceOptions.respectFunctionProperties === false ? false : true;
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options.unorderedArrays = sourceOptions.unorderedArrays !== true ? false : true; // default to false
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options.unorderedSets = sourceOptions.unorderedSets === false ? false : true; // default to false
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options.unorderedObjects = sourceOptions.unorderedObjects === false ? false : true; // default to true
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options.replacer = sourceOptions.replacer || undefined;
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options.excludeKeys = sourceOptions.excludeKeys || undefined;
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if(typeof object === 'undefined') {
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throw new Error('Object argument required.');
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}
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// if there is a case-insensitive match in the hashes list, accept it
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// (i.e. SHA256 for sha256)
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for (var i = 0; i < hashes.length; ++i) {
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if (hashes[i].toLowerCase() === options.algorithm.toLowerCase()) {
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options.algorithm = hashes[i];
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}
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}
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if(hashes.indexOf(options.algorithm) === -1){
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throw new Error('Algorithm "' + options.algorithm + '" not supported. ' +
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'supported values: ' + hashes.join(', '));
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}
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if(encodings.indexOf(options.encoding) === -1 &&
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options.algorithm !== 'passthrough'){
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throw new Error('Encoding "' + options.encoding + '" not supported. ' +
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'supported values: ' + encodings.join(', '));
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}
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return options;
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}
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/** Check if the given function is a native function */
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function isNativeFunction(f) {
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if ((typeof f) !== 'function') {
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return false;
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}
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var exp = /^function\s+\w*\s*\(\s*\)\s*{\s+\[native code\]\s+}$/i;
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return exp.exec(Function.prototype.toString.call(f)) != null;
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}
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function hash(object, options) {
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var hashingStream;
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if (options.algorithm !== 'passthrough') {
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hashingStream = crypto.createHash(options.algorithm);
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} else {
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hashingStream = new PassThrough();
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}
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if (typeof hashingStream.write === 'undefined') {
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hashingStream.write = hashingStream.update;
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hashingStream.end = hashingStream.update;
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}
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var hasher = typeHasher(options, hashingStream);
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hasher.dispatch(object);
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if (!hashingStream.update) {
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hashingStream.end('');
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}
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if (hashingStream.digest) {
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return hashingStream.digest(options.encoding === 'buffer' ? undefined : options.encoding);
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}
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var buf = hashingStream.read();
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if (options.encoding === 'buffer') {
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return buf;
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}
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return buf.toString(options.encoding);
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}
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/**
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* Expose streaming API
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*
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* @param {object} object Value to serialize
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* @param {object} options Options, as for hash()
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* @param {object} stream A stream to write the serializiation to
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* @api public
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*/
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exports.writeToStream = function(object, options, stream) {
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if (typeof stream === 'undefined') {
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stream = options;
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options = {};
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}
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options = applyDefaults(object, options);
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return typeHasher(options, stream).dispatch(object);
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};
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function typeHasher(options, writeTo, context){
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context = context || [];
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var write = function(str) {
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if (writeTo.update) {
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return writeTo.update(str, 'utf8');
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} else {
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return writeTo.write(str, 'utf8');
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}
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};
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return {
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dispatch: function(value){
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if (options.replacer) {
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value = options.replacer(value);
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}
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var type = typeof value;
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if (value === null) {
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type = 'null';
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}
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//console.log("[DEBUG] Dispatch: ", value, "->", type, " -> ", "_" + type);
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return this['_' + type](value);
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},
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_object: function(object) {
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var pattern = (/\[object (.*)\]/i);
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var objString = Object.prototype.toString.call(object);
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var objType = pattern.exec(objString);
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if (!objType) { // object type did not match [object ...]
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objType = 'unknown:[' + objString + ']';
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} else {
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objType = objType[1]; // take only the class name
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}
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objType = objType.toLowerCase();
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var objectNumber = null;
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if ((objectNumber = context.indexOf(object)) >= 0) {
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return this.dispatch('[CIRCULAR:' + objectNumber + ']');
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} else {
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context.push(object);
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}
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if (typeof Buffer !== 'undefined' && Buffer.isBuffer && Buffer.isBuffer(object)) {
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write('buffer:');
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return write(object);
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}
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if(objType !== 'object' && objType !== 'function' && objType !== 'asyncfunction') {
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if(this['_' + objType]) {
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this['_' + objType](object);
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} else if (options.ignoreUnknown) {
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return write('[' + objType + ']');
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} else {
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throw new Error('Unknown object type "' + objType + '"');
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}
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}else{
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var keys = Object.keys(object);
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if (options.unorderedObjects) {
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keys = keys.sort();
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}
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// Make sure to incorporate special properties, so
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// Types with different prototypes will produce
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// a different hash and objects derived from
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// different functions (`new Foo`, `new Bar`) will
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// produce different hashes.
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// We never do this for native functions since some
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// seem to break because of that.
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if (options.respectType !== false && !isNativeFunction(object)) {
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keys.splice(0, 0, 'prototype', '__proto__', 'constructor');
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}
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if (options.excludeKeys) {
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keys = keys.filter(function(key) { return !options.excludeKeys(key); });
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}
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write('object:' + keys.length + ':');
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var self = this;
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return keys.forEach(function(key){
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self.dispatch(key);
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write(':');
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if(!options.excludeValues) {
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self.dispatch(object[key]);
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}
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write(',');
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});
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}
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},
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_array: function(arr, unordered){
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unordered = typeof unordered !== 'undefined' ? unordered :
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options.unorderedArrays !== false; // default to options.unorderedArrays
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var self = this;
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write('array:' + arr.length + ':');
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if (!unordered || arr.length <= 1) {
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return arr.forEach(function(entry) {
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return self.dispatch(entry);
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});
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}
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// the unordered case is a little more complicated:
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// since there is no canonical ordering on objects,
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// i.e. {a:1} < {a:2} and {a:1} > {a:2} are both false,
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// we first serialize each entry using a PassThrough stream
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// before sorting.
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// also: we can’t use the same context array for all entries
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// since the order of hashing should *not* matter. instead,
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// we keep track of the additions to a copy of the context array
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// and add all of them to the global context array when we’re done
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var contextAdditions = [];
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var entries = arr.map(function(entry) {
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var strm = new PassThrough();
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var localContext = context.slice(); // make copy
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var hasher = typeHasher(options, strm, localContext);
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hasher.dispatch(entry);
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// take only what was added to localContext and append it to contextAdditions
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contextAdditions = contextAdditions.concat(localContext.slice(context.length));
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return strm.read().toString();
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});
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context = context.concat(contextAdditions);
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entries.sort();
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return this._array(entries, false);
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},
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_date: function(date){
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return write('date:' + date.toJSON());
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},
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_symbol: function(sym){
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return write('symbol:' + sym.toString());
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},
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_error: function(err){
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return write('error:' + err.toString());
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},
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_boolean: function(bool){
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return write('bool:' + bool.toString());
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},
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_string: function(string){
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write('string:' + string.length + ':');
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write(string.toString());
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},
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_function: function(fn){
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write('fn:');
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if (isNativeFunction(fn)) {
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this.dispatch('[native]');
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} else {
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this.dispatch(fn.toString());
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}
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if (options.respectFunctionNames !== false) {
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// Make sure we can still distinguish native functions
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// by their name, otherwise String and Function will
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// have the same hash
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this.dispatch("function-name:" + String(fn.name));
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}
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if (options.respectFunctionProperties) {
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this._object(fn);
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}
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},
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_number: function(number){
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return write('number:' + number.toString());
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},
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_xml: function(xml){
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return write('xml:' + xml.toString());
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},
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_null: function() {
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return write('Null');
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},
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_undefined: function() {
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return write('Undefined');
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},
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_regexp: function(regex){
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return write('regex:' + regex.toString());
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},
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_uint8array: function(arr){
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write('uint8array:');
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return this.dispatch(Array.prototype.slice.call(arr));
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},
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_uint8clampedarray: function(arr){
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write('uint8clampedarray:');
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return this.dispatch(Array.prototype.slice.call(arr));
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},
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_int8array: function(arr){
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write('int8array:');
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return this.dispatch(Array.prototype.slice.call(arr));
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},
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_uint16array: function(arr){
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write('uint16array:');
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return this.dispatch(Array.prototype.slice.call(arr));
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},
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_int16array: function(arr){
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write('int16array:');
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return this.dispatch(Array.prototype.slice.call(arr));
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},
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_uint32array: function(arr){
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write('uint32array:');
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return this.dispatch(Array.prototype.slice.call(arr));
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},
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_int32array: function(arr){
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write('int32array:');
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return this.dispatch(Array.prototype.slice.call(arr));
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},
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_float32array: function(arr){
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write('float32array:');
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return this.dispatch(Array.prototype.slice.call(arr));
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},
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_float64array: function(arr){
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write('float64array:');
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return this.dispatch(Array.prototype.slice.call(arr));
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},
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_arraybuffer: function(arr){
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write('arraybuffer:');
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return this.dispatch(new Uint8Array(arr));
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},
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_url: function(url) {
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return write('url:' + url.toString(), 'utf8');
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},
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_map: function(map) {
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write('map:');
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var arr = Array.from(map);
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return this._array(arr, options.unorderedSets !== false);
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},
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_set: function(set) {
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write('set:');
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var arr = Array.from(set);
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return this._array(arr, options.unorderedSets !== false);
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},
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_file: function(file) {
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write('file:');
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return this.dispatch([file.name, file.size, file.type, file.lastModfied]);
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},
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_blob: function() {
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if (options.ignoreUnknown) {
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return write('[blob]');
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}
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throw Error('Hashing Blob objects is currently not supported\n' +
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'(see https://github.com/puleos/object-hash/issues/26)\n' +
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'Use "options.replacer" or "options.ignoreUnknown"\n');
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},
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_domwindow: function() { return write('domwindow'); },
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_bigint: function(number){
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return write('bigint:' + number.toString());
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},
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/* Node.js standard native objects */
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_process: function() { return write('process'); },
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_timer: function() { return write('timer'); },
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_pipe: function() { return write('pipe'); },
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_tcp: function() { return write('tcp'); },
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_udp: function() { return write('udp'); },
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_tty: function() { return write('tty'); },
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_statwatcher: function() { return write('statwatcher'); },
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_securecontext: function() { return write('securecontext'); },
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_connection: function() { return write('connection'); },
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_zlib: function() { return write('zlib'); },
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_context: function() { return write('context'); },
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_nodescript: function() { return write('nodescript'); },
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_httpparser: function() { return write('httpparser'); },
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_dataview: function() { return write('dataview'); },
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_signal: function() { return write('signal'); },
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_fsevent: function() { return write('fsevent'); },
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_tlswrap: function() { return write('tlswrap'); },
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};
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}
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// Mini-implementation of stream.PassThrough
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// We are far from having need for the full implementation, and we can
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// make assumptions like "many writes, then only one final read"
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// and we can ignore encoding specifics
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function PassThrough() {
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return {
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buf: '',
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write: function(b) {
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this.buf += b;
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},
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end: function(b) {
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this.buf += b;
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},
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read: function() {
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return this.buf;
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}
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};
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}
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