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212 lines
6.3 KiB
Markdown
212 lines
6.3 KiB
Markdown
# psl (Public Suffix List)
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[](https://github.com/lupomontero/psl/actions/workflows/node.js.yml)
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`psl` is a `JavaScript` domain name parser based on the
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[Public Suffix List](https://publicsuffix.org/).
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This implementation is tested against the
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[test data hosted by Mozilla](http://mxr.mozilla.org/mozilla-central/source/netwerk/test/unit/data/test_psl.txt?raw=1)
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and kindly provided by [Comodo](https://www.comodo.com/).
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Cross browser testing provided by
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[<img alt="BrowserStack" width="160" src="./browserstack-logo.svg" />](https://www.browserstack.com/)
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## What is the Public Suffix List?
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The Public Suffix List is a cross-vendor initiative to provide an accurate list
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of domain name suffixes.
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The Public Suffix List is an initiative of the Mozilla Project, but is
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maintained as a community resource. It is available for use in any software,
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but was originally created to meet the needs of browser manufacturers.
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A "public suffix" is one under which Internet users can directly register names.
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Some examples of public suffixes are ".com", ".co.uk" and "pvt.k12.wy.us". The
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Public Suffix List is a list of all known public suffixes.
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Source: http://publicsuffix.org
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## Installation
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### Node.js
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```sh
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npm install --save psl
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```
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### Browser
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Download [psl.min.js](https://raw.githubusercontent.com/lupomontero/psl/master/dist/psl.min.js)
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and include it in a script tag.
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```html
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<script src="psl.min.js"></script>
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```
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This script is browserified and wrapped in a [umd](https://github.com/umdjs/umd)
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wrapper so you should be able to use it standalone or together with a module
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loader.
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## API
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### `psl.parse(domain)`
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Parse domain based on Public Suffix List. Returns an `Object` with the following
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properties:
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* `tld`: Top level domain (this is the _public suffix_).
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* `sld`: Second level domain (the first private part of the domain name).
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* `domain`: The domain name is the `sld` + `tld`.
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* `subdomain`: Optional parts left of the domain.
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#### Example:
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```js
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var psl = require('psl');
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// Parse domain without subdomain
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var parsed = psl.parse('google.com');
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console.log(parsed.tld); // 'com'
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console.log(parsed.sld); // 'google'
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console.log(parsed.domain); // 'google.com'
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console.log(parsed.subdomain); // null
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// Parse domain with subdomain
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var parsed = psl.parse('www.google.com');
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console.log(parsed.tld); // 'com'
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console.log(parsed.sld); // 'google'
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console.log(parsed.domain); // 'google.com'
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console.log(parsed.subdomain); // 'www'
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// Parse domain with nested subdomains
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var parsed = psl.parse('a.b.c.d.foo.com');
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console.log(parsed.tld); // 'com'
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console.log(parsed.sld); // 'foo'
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console.log(parsed.domain); // 'foo.com'
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console.log(parsed.subdomain); // 'a.b.c.d'
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```
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### `psl.get(domain)`
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Get domain name, `sld` + `tld`. Returns `null` if not valid.
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#### Example:
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```js
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var psl = require('psl');
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// null input.
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psl.get(null); // null
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// Mixed case.
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psl.get('COM'); // null
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psl.get('example.COM'); // 'example.com'
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psl.get('WwW.example.COM'); // 'example.com'
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// Unlisted TLD.
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psl.get('example'); // null
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psl.get('example.example'); // 'example.example'
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psl.get('b.example.example'); // 'example.example'
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psl.get('a.b.example.example'); // 'example.example'
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// TLD with only 1 rule.
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psl.get('biz'); // null
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psl.get('domain.biz'); // 'domain.biz'
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psl.get('b.domain.biz'); // 'domain.biz'
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psl.get('a.b.domain.biz'); // 'domain.biz'
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// TLD with some 2-level rules.
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psl.get('uk.com'); // null);
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psl.get('example.uk.com'); // 'example.uk.com');
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psl.get('b.example.uk.com'); // 'example.uk.com');
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// More complex TLD.
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psl.get('c.kobe.jp'); // null
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psl.get('b.c.kobe.jp'); // 'b.c.kobe.jp'
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psl.get('a.b.c.kobe.jp'); // 'b.c.kobe.jp'
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psl.get('city.kobe.jp'); // 'city.kobe.jp'
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psl.get('www.city.kobe.jp'); // 'city.kobe.jp'
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// IDN labels.
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psl.get('食狮.com.cn'); // '食狮.com.cn'
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psl.get('食狮.公司.cn'); // '食狮.公司.cn'
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psl.get('www.食狮.公司.cn'); // '食狮.公司.cn'
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// Same as above, but punycoded.
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psl.get('xn--85x722f.com.cn'); // 'xn--85x722f.com.cn'
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psl.get('xn--85x722f.xn--55qx5d.cn'); // 'xn--85x722f.xn--55qx5d.cn'
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psl.get('www.xn--85x722f.xn--55qx5d.cn'); // 'xn--85x722f.xn--55qx5d.cn'
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```
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### `psl.isValid(domain)`
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Check whether a domain has a valid Public Suffix. Returns a `Boolean` indicating
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whether the domain has a valid Public Suffix.
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#### Example
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```js
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var psl = require('psl');
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psl.isValid('google.com'); // true
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psl.isValid('www.google.com'); // true
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psl.isValid('x.yz'); // false
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```
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## Testing and Building
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Test are written using [`mocha`](https://mochajs.org/) and can be
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run in two different environments: `node` and `phantomjs`.
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```sh
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# This will run `eslint`, `mocha` and `karma`.
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npm test
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# Individual test environments
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# Run tests in node only.
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./node_modules/.bin/mocha test
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# Run tests in phantomjs only.
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./node_modules/.bin/karma start ./karma.conf.js --single-run
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# Build data (parse raw list) and create dist files
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npm run build
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```
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Feel free to fork if you see possible improvements!
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## Acknowledgements
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* Mozilla Foundation's [Public Suffix List](https://publicsuffix.org/)
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* Thanks to Rob Stradling of [Comodo](https://www.comodo.com/) for providing
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test data.
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* Inspired by [weppos/publicsuffix-ruby](https://github.com/weppos/publicsuffix-ruby)
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## License
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The MIT License (MIT)
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Copyright (c) 2017 Lupo Montero <lupomontero@gmail.com>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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