199 lines
6.6 KiB
Markdown
199 lines
6.6 KiB
Markdown
# object-hash
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Generate hashes from objects and values in node and the browser. Uses node.js
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crypto module for hashing. Supports SHA1 and many others (depending on the platform)
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as well as custom streams (e.g. CRC32).
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[](https://www.npmjs.com/package/object-hash)
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[](https://secure.travis-ci.org/puleos/object-hash?branch=master)
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[](https://coveralls.io/github/puleos/object-hash?branch=master)
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* Hash values of any type.
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* Supports a keys only option for grouping similar objects with different values.
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```js
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var hash = require('object-hash');
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hash({foo: 'bar'}) // => '67b69634f9880a282c14a0f0cb7ba20cf5d677e9'
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hash([1, 2, 2.718, 3.14159]) // => '136b9b88375971dff9f1af09d7356e3e04281951'
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```
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## Versioning Disclaimer
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Starting with version `1.1.8` (released April 2017), new versions will consider
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the exact returned hash part of the API contract, i.e. changes that will affect
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hash values will be considered `semver-major`. Previous versions may violate
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that expectation.
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For more information, see [this discussion](https://github.com/puleos/object-hash/issues/30).
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## hash(value, options)
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Generate a hash from any object or type. Defaults to sha1 with hex encoding.
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* `algorithm` hash algo to be used: 'sha1', 'md5', 'passthrough'. default: sha1
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* This supports the algorithms returned by `crypto.getHashes()`. Note that the default of SHA-1 is not considered secure, and a stronger algorithm should be used if a cryptographical hash is desired.
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* This also supports the `passthrough` algorith, which will return the information that would otherwise have been hashed.
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* `excludeValues` {true|false} hash object keys, values ignored. default: false
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* `encoding` hash encoding, supports 'buffer', 'hex', 'binary', 'base64'. default: hex
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* `ignoreUnknown` {true|*false} ignore unknown object types. default: false
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* `replacer` optional function that replaces values before hashing. default: accept all values
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* `respectFunctionProperties` {true|false} Whether properties on functions are considered when hashing. default: true
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* `respectFunctionNames` {true|false} consider `name` property of functions for hashing. default: true
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* `respectType` {true|false} Whether special type attributes (`.prototype`, `.__proto__`, `.constructor`)
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are hashed. default: true
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* `unorderedArrays` {true|false} Sort all arrays before hashing. Note that this affects *all* collections,
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i.e. including typed arrays, Sets, Maps, etc. default: false
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* `unorderedSets` {true|false} Sort `Set` and `Map` instances before hashing, i.e. make
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`hash(new Set([1, 2])) == hash(new Set([2, 1]))` return `true`. default: true
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* `unorderedObjects` {true|false} Sort objects before hashing, i.e. make `hash({ x: 1, y: 2 }) === hash({ y: 2, x: 1 })`. default: true
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* `excludeKeys` optional function for excluding specific key(s) from hashing, if true is returned then exclude from hash. default: include all keys
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## hash.sha1(value)
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Hash using the sha1 algorithm.
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Note that SHA-1 is not considered secure, and a stronger algorithm should be used if a cryptographical hash is desired.
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*Sugar method, equivalent to* `hash(value, {algorithm: 'sha1'})`
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## hash.keys(value)
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Hash object keys using the sha1 algorithm, values ignored.
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*Sugar method, equivalent to* `hash(value, {excludeValues: true})`
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## hash.MD5(value)
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Hash using the md5 algorithm.
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Note that the MD5 algorithm is not considered secure, and a stronger algorithm should be used if a cryptographical hash is desired.
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*Sugar method, equivalent to* `hash(value, {algorithm: 'md5'})`
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## hash.keysMD5(value)
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Hash object keys using the md5 algorithm, values ignored.
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Note that the MD5 algorithm is not considered secure, and a stronger algorithm should be used if a cryptographical hash is desired.
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*Sugar method, equivalent to* `hash(value, {algorithm: 'md5', excludeValues: true})`
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## hash.writeToStream(value, [options,] stream)
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Write the information that would otherwise have been hashed to a stream, e.g.:
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```js
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hash.writeToStream({foo: 'bar', a: 42}, {respectType: false}, process.stdout)
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// => e.g. 'object:a:number:42foo:string:bar'
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```
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## Installation
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node:
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```js
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npm install object-hash
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```
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browser: */dist/object_hash.js*
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```html
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<script src="object_hash.js" type="text/javascript"></script>
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<script>
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var hash = objectHash.sha1({foo:'bar'});
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console.log(hash); // e003c89cdf35cdf46d8239b4692436364b7259f9
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</script>
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```
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## Example usage
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```js
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var hash = require('object-hash');
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var peter = { name: 'Peter', stapler: false, friends: ['Joanna', 'Michael', 'Samir'] };
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var michael = { name: 'Michael', stapler: false, friends: ['Peter', 'Samir'] };
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var bob = { name: 'Bob', stapler: true, friends: [] };
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/***
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* sha1 hex encoding (default)
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*/
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hash(peter);
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// 14fa461bf4b98155e82adc86532938553b4d33a9
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hash(michael);
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// 4b2b30e27699979ce46714253bc2213010db039c
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hash(bob);
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// 38d96106bc8ef3d8bd369b99bb6972702c9826d5
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/***
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* hash object keys, values ignored
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*/
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hash(peter, { excludeValues: true });
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// 48f370a772c7496f6c9d2e6d92e920c87dd00a5c
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hash(michael, { excludeValues: true });
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// 48f370a772c7496f6c9d2e6d92e920c87dd00a5c
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hash.keys(bob);
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// 48f370a772c7496f6c9d2e6d92e920c87dd00a5c
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/***
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* hash object, ignore specific key(s)
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*/
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hash(peter, { excludeKeys: function(key) {
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if ( key === 'friends') {
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return true;
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}
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return false;
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}
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});
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// 66b7d7e64871aa9fda1bdc8e88a28df797648d80
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/***
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* md5 base64 encoding
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*/
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hash(peter, { algorithm: 'md5', encoding: 'base64' });
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// 6rkWaaDiG3NynWw4svGH7g==
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hash(michael, { algorithm: 'md5', encoding: 'base64' });
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// djXaWpuWVJeOF8Sb6SFFNg==
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hash(bob, { algorithm: 'md5', encoding: 'base64' });
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// lFzkw/IJ8/12jZI0rQeS3w==
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```
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## Legacy Browser Support
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IE <= 8 and Opera <= 11 support dropped in version 0.3.0. If you require
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legacy browser support you must either use an ES5 shim or use version 0.2.5
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of this module.
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## Development
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```sh-session
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git clone https://github.com/puleos/object-hash
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```
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## Node Docker Wrapper
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If you want to stand this up in a docker container, you should take at look
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at the [](https://github.com/bean5/node-object-hash) project.
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### gulp tasks
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* `gulp watch` (default) watch files, test and lint on change/add
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* `gulp test` unit tests
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* `gulp karma` browser unit tests
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* `gulp lint` jshint
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* `gulp dist` create browser version in /dist
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## License
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MIT
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## Changelog
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### v2.0.0
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Only Node.js versions `>= 6.0.0` are being tested in CI now.
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No other breaking changes were introduced.
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