You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
244 lines
9.0 KiB
244 lines
9.0 KiB
4 years ago
|
# cors
|
||
|
|
|
||
|
|
[![NPM Version][npm-image]][npm-url]
|
||
|
|
[![NPM Downloads][downloads-image]][downloads-url]
|
||
|
|
[![Build Status][travis-image]][travis-url]
|
||
|
|
[![Test Coverage][coveralls-image]][coveralls-url]
|
||
|
|
|
||
|
|
CORS is a node.js package for providing a [Connect](http://www.senchalabs.org/connect/)/[Express](http://expressjs.com/) middleware that can be used to enable [CORS](http://en.wikipedia.org/wiki/Cross-origin_resource_sharing) with various options.
|
||
|
|
|
||
|
|
**[Follow me (@troygoode) on Twitter!](https://twitter.com/intent/user?screen_name=troygoode)**
|
||
|
|
|
||
|
|
* [Installation](#installation)
|
||
|
|
* [Usage](#usage)
|
||
|
|
* [Simple Usage](#simple-usage-enable-all-cors-requests)
|
||
|
|
* [Enable CORS for a Single Route](#enable-cors-for-a-single-route)
|
||
|
|
* [Configuring CORS](#configuring-cors)
|
||
|
|
* [Configuring CORS Asynchronously](#configuring-cors-asynchronously)
|
||
|
|
* [Enabling CORS Pre-Flight](#enabling-cors-pre-flight)
|
||
|
|
* [Configuration Options](#configuration-options)
|
||
|
|
* [Demo](#demo)
|
||
|
|
* [License](#license)
|
||
|
|
* [Author](#author)
|
||
|
|
|
||
|
|
## Installation
|
||
|
|
|
||
|
|
This is a [Node.js](https://nodejs.org/en/) module available through the
|
||
|
|
[npm registry](https://www.npmjs.com/). Installation is done using the
|
||
|
|
[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):
|
||
|
|
|
||
|
|
```sh
|
||
|
|
$ npm install cors
|
||
|
|
```
|
||
|
|
|
||
|
|
## Usage
|
||
|
|
|
||
|
|
### Simple Usage (Enable *All* CORS Requests)
|
||
|
|
|
||
|
|
```javascript
|
||
|
|
var express = require('express')
|
||
|
|
var cors = require('cors')
|
||
|
|
var app = express()
|
||
|
|
|
||
|
|
app.use(cors())
|
||
|
|
|
||
|
|
app.get('/products/:id', function (req, res, next) {
|
||
|
|
res.json({msg: 'This is CORS-enabled for all origins!'})
|
||
|
|
})
|
||
|
|
|
||
|
|
app.listen(80, function () {
|
||
|
|
console.log('CORS-enabled web server listening on port 80')
|
||
|
|
})
|
||
|
|
```
|
||
|
|
|
||
|
|
### Enable CORS for a Single Route
|
||
|
|
|
||
|
|
```javascript
|
||
|
|
var express = require('express')
|
||
|
|
var cors = require('cors')
|
||
|
|
var app = express()
|
||
|
|
|
||
|
|
app.get('/products/:id', cors(), function (req, res, next) {
|
||
|
|
res.json({msg: 'This is CORS-enabled for a Single Route'})
|
||
|
|
})
|
||
|
|
|
||
|
|
app.listen(80, function () {
|
||
|
|
console.log('CORS-enabled web server listening on port 80')
|
||
|
|
})
|
||
|
|
```
|
||
|
|
|
||
|
|
### Configuring CORS
|
||
|
|
|
||
|
|
```javascript
|
||
|
|
var express = require('express')
|
||
|
|
var cors = require('cors')
|
||
|
|
var app = express()
|
||
|
|
|
||
|
|
var corsOptions = {
|
||
|
|
origin: 'http://example.com',
|
||
|
|
optionsSuccessStatus: 200 // some legacy browsers (IE11, various SmartTVs) choke on 204
|
||
|
|
}
|
||
|
|
|
||
|
|
app.get('/products/:id', cors(corsOptions), function (req, res, next) {
|
||
|
|
res.json({msg: 'This is CORS-enabled for only example.com.'})
|
||
|
|
})
|
||
|
|
|
||
|
|
app.listen(80, function () {
|
||
|
|
console.log('CORS-enabled web server listening on port 80')
|
||
|
|
})
|
||
|
|
```
|
||
|
|
|
||
|
|
### Configuring CORS w/ Dynamic Origin
|
||
|
|
|
||
|
|
```javascript
|
||
|
|
var express = require('express')
|
||
|
|
var cors = require('cors')
|
||
|
|
var app = express()
|
||
|
|
|
||
|
|
var whitelist = ['http://example1.com', 'http://example2.com']
|
||
|
|
var corsOptions = {
|
||
|
|
origin: function (origin, callback) {
|
||
|
|
if (whitelist.indexOf(origin) !== -1) {
|
||
|
|
callback(null, true)
|
||
|
|
} else {
|
||
|
|
callback(new Error('Not allowed by CORS'))
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
app.get('/products/:id', cors(corsOptions), function (req, res, next) {
|
||
|
|
res.json({msg: 'This is CORS-enabled for a whitelisted domain.'})
|
||
|
|
})
|
||
|
|
|
||
|
|
app.listen(80, function () {
|
||
|
|
console.log('CORS-enabled web server listening on port 80')
|
||
|
|
})
|
||
|
|
```
|
||
|
|
|
||
|
|
If you do not want to block REST tools or server-to-server requests,
|
||
|
|
add a `!origin` check in the origin function like so:
|
||
|
|
|
||
|
|
```javascript
|
||
|
|
var corsOptions = {
|
||
|
|
origin: function (origin, callback) {
|
||
|
|
if (whitelist.indexOf(origin) !== -1 || !origin) {
|
||
|
|
callback(null, true)
|
||
|
|
} else {
|
||
|
|
callback(new Error('Not allowed by CORS'))
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
### Enabling CORS Pre-Flight
|
||
|
|
|
||
|
|
Certain CORS requests are considered 'complex' and require an initial
|
||
|
|
`OPTIONS` request (called the "pre-flight request"). An example of a
|
||
|
|
'complex' CORS request is one that uses an HTTP verb other than
|
||
|
|
GET/HEAD/POST (such as DELETE) or that uses custom headers. To enable
|
||
|
|
pre-flighting, you must add a new OPTIONS handler for the route you want
|
||
|
|
to support:
|
||
|
|
|
||
|
|
```javascript
|
||
|
|
var express = require('express')
|
||
|
|
var cors = require('cors')
|
||
|
|
var app = express()
|
||
|
|
|
||
|
|
app.options('/products/:id', cors()) // enable pre-flight request for DELETE request
|
||
|
|
app.del('/products/:id', cors(), function (req, res, next) {
|
||
|
|
res.json({msg: 'This is CORS-enabled for all origins!'})
|
||
|
|
})
|
||
|
|
|
||
|
|
app.listen(80, function () {
|
||
|
|
console.log('CORS-enabled web server listening on port 80')
|
||
|
|
})
|
||
|
|
```
|
||
|
|
|
||
|
|
You can also enable pre-flight across-the-board like so:
|
||
|
|
|
||
|
|
```javascript
|
||
|
|
app.options('*', cors()) // include before other routes
|
||
|
|
```
|
||
|
|
|
||
|
|
### Configuring CORS Asynchronously
|
||
|
|
|
||
|
|
```javascript
|
||
|
|
var express = require('express')
|
||
|
|
var cors = require('cors')
|
||
|
|
var app = express()
|
||
|
|
|
||
|
|
var whitelist = ['http://example1.com', 'http://example2.com']
|
||
|
|
var corsOptionsDelegate = function (req, callback) {
|
||
|
|
var corsOptions;
|
||
|
|
if (whitelist.indexOf(req.header('Origin')) !== -1) {
|
||
|
|
corsOptions = { origin: true } // reflect (enable) the requested origin in the CORS response
|
||
|
|
} else {
|
||
|
|
corsOptions = { origin: false } // disable CORS for this request
|
||
|
|
}
|
||
|
|
callback(null, corsOptions) // callback expects two parameters: error and options
|
||
|
|
}
|
||
|
|
|
||
|
|
app.get('/products/:id', cors(corsOptionsDelegate), function (req, res, next) {
|
||
|
|
res.json({msg: 'This is CORS-enabled for a whitelisted domain.'})
|
||
|
|
})
|
||
|
|
|
||
|
|
app.listen(80, function () {
|
||
|
|
console.log('CORS-enabled web server listening on port 80')
|
||
|
|
})
|
||
|
|
```
|
||
|
|
|
||
|
|
## Configuration Options
|
||
|
|
|
||
|
|
* `origin`: Configures the **Access-Control-Allow-Origin** CORS header. Possible values:
|
||
|
|
- `Boolean` - set `origin` to `true` to reflect the [request origin](http://tools.ietf.org/html/draft-abarth-origin-09), as defined by `req.header('Origin')`, or set it to `false` to disable CORS.
|
||
|
|
- `String` - set `origin` to a specific origin. For example if you set it to `"http://example.com"` only requests from "http://example.com" will be allowed.
|
||
|
|
- `RegExp` - set `origin` to a regular expression pattern which will be used to test the request origin. If it's a match, the request origin will be reflected. For example the pattern `/example\.com$/` will reflect any request that is coming from an origin ending with "example.com".
|
||
|
|
- `Array` - set `origin` to an array of valid origins. Each origin can be a `String` or a `RegExp`. For example `["http://example1.com", /\.example2\.com$/]` will accept any request from "http://example1.com" or from a subdomain of "example2.com".
|
||
|
|
- `Function` - set `origin` to a function implementing some custom logic. The function takes the request origin as the first parameter and a callback (which expects the signature `err [object], allow [bool]`) as the second.
|
||
|
|
* `methods`: Configures the **Access-Control-Allow-Methods** CORS header. Expects a comma-delimited string (ex: 'GET,PUT,POST') or an array (ex: `['GET', 'PUT', 'POST']`).
|
||
|
|
* `allowedHeaders`: Configures the **Access-Control-Allow-Headers** CORS header. Expects a comma-delimited string (ex: 'Content-Type,Authorization') or an array (ex: `['Content-Type', 'Authorization']`). If not specified, defaults to reflecting the headers specified in the request's **Access-Control-Request-Headers** header.
|
||
|
|
* `exposedHeaders`: Configures the **Access-Control-Expose-Headers** CORS header. Expects a comma-delimited string (ex: 'Content-Range,X-Content-Range') or an array (ex: `['Content-Range', 'X-Content-Range']`). If not specified, no custom headers are exposed.
|
||
|
|
* `credentials`: Configures the **Access-Control-Allow-Credentials** CORS header. Set to `true` to pass the header, otherwise it is omitted.
|
||
|
|
* `maxAge`: Configures the **Access-Control-Max-Age** CORS header. Set to an integer to pass the header, otherwise it is omitted.
|
||
|
|
* `preflightContinue`: Pass the CORS preflight response to the next handler.
|
||
|
|
* `optionsSuccessStatus`: Provides a status code to use for successful `OPTIONS` requests, since some legacy browsers (IE11, various SmartTVs) choke on `204`.
|
||
|
|
|
||
|
|
The default configuration is the equivalent of:
|
||
|
|
|
||
|
|
```json
|
||
|
|
{
|
||
|
|
"origin": "*",
|
||
|
|
"methods": "GET,HEAD,PUT,PATCH,POST,DELETE",
|
||
|
|
"preflightContinue": false,
|
||
|
|
"optionsSuccessStatus": 204
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
For details on the effect of each CORS header, read [this](http://www.html5rocks.com/en/tutorials/cors/) article on HTML5 Rocks.
|
||
|
|
|
||
|
|
## Demo
|
||
|
|
|
||
|
|
A demo that illustrates CORS working (and not working) using jQuery is available here: [http://node-cors-client.herokuapp.com/](http://node-cors-client.herokuapp.com/)
|
||
|
|
|
||
|
|
Code for that demo can be found here:
|
||
|
|
|
||
|
|
* Client: [https://github.com/TroyGoode/node-cors-client](https://github.com/TroyGoode/node-cors-client)
|
||
|
|
* Server: [https://github.com/TroyGoode/node-cors-server](https://github.com/TroyGoode/node-cors-server)
|
||
|
|
|
||
|
|
## License
|
||
|
|
|
||
|
|
[MIT License](http://www.opensource.org/licenses/mit-license.php)
|
||
|
|
|
||
|
|
## Author
|
||
|
|
|
||
|
|
[Troy Goode](https://github.com/TroyGoode) ([troygoode@gmail.com](mailto:troygoode@gmail.com))
|
||
|
|
|
||
|
|
[coveralls-image]: https://img.shields.io/coveralls/expressjs/cors/master.svg
|
||
|
|
[coveralls-url]: https://coveralls.io/r/expressjs/cors?branch=master
|
||
|
|
[downloads-image]: https://img.shields.io/npm/dm/cors.svg
|
||
|
|
[downloads-url]: https://npmjs.org/package/cors
|
||
|
|
[npm-image]: https://img.shields.io/npm/v/cors.svg
|
||
|
|
[npm-url]: https://npmjs.org/package/cors
|
||
|
|
[travis-image]: https://img.shields.io/travis/expressjs/cors/master.svg
|
||
|
|
[travis-url]: https://travis-ci.org/expressjs/cors
|