docs: improve registerFileProtocol example (#35580 )

* improve registerFileProtocol example

* link ProtocolResponse

* kick lint

2022-09-07 14:45:09 -04:00

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protocol

Register a custom protocol and intercept existing protocol requests.

Process: Main

An example of implementing a protocol that has the same effect as the file:// protocol:

const { app, protocol } = require('electron')
const path = require('path')
const url = require('url')

app.whenReady().then(() => {
  protocol.registerFileProtocol('atom', (request, callback) => {
    const filePath = url.fileURLToPath('file://' + request.url.slice('atom://'.length))
    callback(filePath)
  })
})

Note: All methods unless specified can only be used after the ready event of the app module gets emitted.

Using `protocol` with a custom `partition` or `session`

A protocol is registered to a specific Electron session object. If you don't specify a session, then your protocol will be applied to the default session that Electron uses. However, if you define a partition or session on your browserWindow's webPreferences, then that window will use a different session and your custom protocol will not work if you just use electron.protocol.XXX.

To have your custom protocol work in combination with a custom session, you need to register it to that session explicitly.

const { session, app, protocol } = require('electron')
const path = require('path')

app.whenReady().then(() => {
  const partition = 'persist:example'
  const ses = session.fromPartition(partition)

  ses.protocol.registerFileProtocol('atom', (request, callback) => {
    const url = request.url.substr(7)
    callback({ path: path.normalize(`${__dirname}/${url}`) })
  })

  mainWindow = new BrowserWindow({ webPreferences: { partition } })
})

Methods

The protocol module has the following methods:

`protocol.registerSchemesAsPrivileged(customSchemes)`

customSchemes CustomScheme[]

Note: This method can only be used before the ready event of the app module gets emitted and can be called only once.

Registers the scheme as standard, secure, bypasses content security policy for resources, allows registering ServiceWorker, supports fetch API, and streaming video/audio. Specify a privilege with the value of true to enable the capability.

An example of registering a privileged scheme, that bypasses Content Security Policy:

const { protocol } = require('electron')
protocol.registerSchemesAsPrivileged([
  { scheme: 'foo', privileges: { bypassCSP: true } }
])

A standard scheme adheres to what RFC 3986 calls generic URI syntax. For example http and https are standard schemes, while file is not.

Registering a scheme as standard allows relative and absolute resources to be resolved correctly when served. Otherwise the scheme will behave like the file protocol, but without the ability to resolve relative URLs.

For example when you load following page with custom protocol without registering it as standard scheme, the image will not be loaded because non-standard schemes can not recognize relative URLs:

<body>
  <img src='test.png'>
</body>

Registering a scheme as standard will allow access to files through the FileSystem API. Otherwise the renderer will throw a security error for the scheme.

By default web storage apis (localStorage, sessionStorage, webSQL, indexedDB, cookies) are disabled for non standard schemes. So in general if you want to register a custom protocol to replace the http protocol, you have to register it as a standard scheme.

Protocols that use streams (http and stream protocols) should set stream: true. The <video> and <audio> HTML elements expect protocols to buffer their responses by default. The stream flag configures those elements to correctly expect streaming responses.

`protocol.registerFileProtocol(scheme, handler)`

scheme string
handler Function
- request ProtocolRequest
- callback Function
  - response (string | ProtocolResponse)

Returns boolean - Whether the protocol was successfully registered

Registers a protocol of scheme that will send a file as the response. The handler will be called with request and callback where request is an incoming request for the scheme.

To handle the request, the callback should be called with either the file's path or an object that has a path property, e.g. callback(filePath) or callback({ path: filePath }). The filePath must be an absolute path.

By default the scheme is treated like http:, which is parsed differently from protocols that follow the "generic URI syntax" like file:.

`protocol.registerBufferProtocol(scheme, handler)`

scheme string
handler Function
- request ProtocolRequest
- callback Function
  - response (Buffer | ProtocolResponse)

Returns boolean - Whether the protocol was successfully registered

Registers a protocol of scheme that will send a Buffer as a response.

The usage is the same with registerFileProtocol, except that the callback should be called with either a Buffer object or an object that has the data property.

Example:

protocol.registerBufferProtocol('atom', (request, callback) => {
  callback({ mimeType: 'text/html', data: Buffer.from('<h5>Response</h5>') })
})

`protocol.registerStringProtocol(scheme, handler)`

scheme string
handler Function
- request ProtocolRequest
- callback Function
  - response (string | ProtocolResponse)

Returns boolean - Whether the protocol was successfully registered

Registers a protocol of scheme that will send a string as a response.

The usage is the same with registerFileProtocol, except that the callback should be called with either a string or an object that has the data property.

`protocol.registerHttpProtocol(scheme, handler)`

scheme string
handler Function
- request ProtocolRequest
- callback Function
  - response ProtocolResponse

Returns boolean - Whether the protocol was successfully registered

Registers a protocol of scheme that will send an HTTP request as a response.

The usage is the same with registerFileProtocol, except that the callback should be called with an object that has the url property.

`protocol.registerStreamProtocol(scheme, handler)`

scheme string
handler Function
- request ProtocolRequest
- callback Function
  - response (ReadableStream | ProtocolResponse)

Returns boolean - Whether the protocol was successfully registered

Registers a protocol of scheme that will send a stream as a response.

The usage is the same with registerFileProtocol, except that the callback should be called with either a ReadableStream object or an object that has the data property.

Example:

const { protocol } = require('electron')
const { PassThrough } = require('stream')

function createStream (text) {
  const rv = new PassThrough() // PassThrough is also a Readable stream
  rv.push(text)
  rv.push(null)
  return rv
}

protocol.registerStreamProtocol('atom', (request, callback) => {
  callback({
    statusCode: 200,
    headers: {
      'content-type': 'text/html'
    },
    data: createStream('<h5>Response</h5>')
  })
})

It is possible to pass any object that implements the readable stream API (emits data/end/error events). For example, here's how a file could be returned:

protocol.registerStreamProtocol('atom', (request, callback) => {
  callback(fs.createReadStream('index.html'))
})

`protocol.unregisterProtocol(scheme)`

scheme string

Returns boolean - Whether the protocol was successfully unregistered

Unregisters the custom protocol of scheme.

`protocol.isProtocolRegistered(scheme)`

scheme string

Returns boolean - Whether scheme is already registered.