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129 lines
3.8 KiB
Markdown
129 lines
3.8 KiB
Markdown
12 months ago
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# encodeurl
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[![NPM Version][npm-image]][npm-url]
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[![NPM Downloads][downloads-image]][downloads-url]
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[![Node.js Version][node-version-image]][node-version-url]
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[![Build Status][travis-image]][travis-url]
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[![Test Coverage][coveralls-image]][coveralls-url]
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Encode a URL to a percent-encoded form, excluding already-encoded sequences
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## Installation
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This is a [Node.js](https://nodejs.org/en/) module available through the
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[npm registry](https://www.npmjs.com/). Installation is done using the
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[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):
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```sh
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$ npm install encodeurl
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```
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## API
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```js
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var encodeUrl = require('encodeurl')
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```
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### encodeUrl(url)
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Encode a URL to a percent-encoded form, excluding already-encoded sequences.
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This function will take an already-encoded URL and encode all the non-URL
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code points (as UTF-8 byte sequences). This function will not encode the
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"%" character unless it is not part of a valid sequence (`%20` will be
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left as-is, but `%foo` will be encoded as `%25foo`).
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This encode is meant to be "safe" and does not throw errors. It will try as
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hard as it can to properly encode the given URL, including replacing any raw,
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unpaired surrogate pairs with the Unicode replacement character prior to
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encoding.
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This function is _similar_ to the intrinsic function `encodeURI`, except it
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will not encode the `%` character if that is part of a valid sequence, will
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not encode `[` and `]` (for IPv6 hostnames) and will replace raw, unpaired
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surrogate pairs with the Unicode replacement character (instead of throwing).
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## Examples
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### Encode a URL containing user-controled data
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```js
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var encodeUrl = require('encodeurl')
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var escapeHtml = require('escape-html')
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http.createServer(function onRequest (req, res) {
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// get encoded form of inbound url
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var url = encodeUrl(req.url)
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// create html message
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var body = '<p>Location ' + escapeHtml(url) + ' not found</p>'
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// send a 404
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res.statusCode = 404
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res.setHeader('Content-Type', 'text/html; charset=UTF-8')
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res.setHeader('Content-Length', String(Buffer.byteLength(body, 'utf-8')))
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res.end(body, 'utf-8')
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})
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```
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### Encode a URL for use in a header field
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```js
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var encodeUrl = require('encodeurl')
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var escapeHtml = require('escape-html')
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var url = require('url')
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http.createServer(function onRequest (req, res) {
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// parse inbound url
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var href = url.parse(req)
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// set new host for redirect
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href.host = 'localhost'
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href.protocol = 'https:'
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href.slashes = true
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// create location header
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var location = encodeUrl(url.format(href))
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// create html message
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var body = '<p>Redirecting to new site: ' + escapeHtml(location) + '</p>'
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// send a 301
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res.statusCode = 301
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res.setHeader('Content-Type', 'text/html; charset=UTF-8')
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res.setHeader('Content-Length', String(Buffer.byteLength(body, 'utf-8')))
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res.setHeader('Location', location)
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res.end(body, 'utf-8')
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})
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```
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## Testing
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```sh
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$ npm test
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$ npm run lint
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```
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## References
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- [RFC 3986: Uniform Resource Identifier (URI): Generic Syntax][rfc-3986]
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- [WHATWG URL Living Standard][whatwg-url]
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[rfc-3986]: https://tools.ietf.org/html/rfc3986
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[whatwg-url]: https://url.spec.whatwg.org/
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## License
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[MIT](LICENSE)
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[npm-image]: https://img.shields.io/npm/v/encodeurl.svg
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[npm-url]: https://npmjs.org/package/encodeurl
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[node-version-image]: https://img.shields.io/node/v/encodeurl.svg
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[node-version-url]: https://nodejs.org/en/download
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[travis-image]: https://img.shields.io/travis/pillarjs/encodeurl.svg
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[travis-url]: https://travis-ci.org/pillarjs/encodeurl
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[coveralls-image]: https://img.shields.io/coveralls/pillarjs/encodeurl.svg
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[coveralls-url]: https://coveralls.io/r/pillarjs/encodeurl?branch=master
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[downloads-image]: https://img.shields.io/npm/dm/encodeurl.svg
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[downloads-url]: https://npmjs.org/package/encodeurl
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