166 lines
5.2 KiB
Markdown
166 lines
5.2 KiB
Markdown
# protocol
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The `protocol` module can register a custom protocol or intercept an existing
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protocol.
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An example of implementing a protocol that has the same effect as the
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`file://` protocol:
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```javascript
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var app = require('app');
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var path = require('path');
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app.on('ready', function() {
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var protocol = require('protocol');
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protocol.registerFileProtocol('atom', function(request, callback) {
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var url = request.url.substr(7);
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callback({path: path.normalize(__dirname + '/' + url)});
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}, function (error) {
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if (error)
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console.error('Failed to register protocol')
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});
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});
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```
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**Note:** This module can only be used after the `ready` event in the `app`
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module is emitted.
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## Methods
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The `protocol` module has the following methods:
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### `protocol.registerStandardSchemes(schemes)`
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* `schemes` Array - Custom schemes to be registered as standard schemes.
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A standard `scheme` adheres to what RFC 3986 calls
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[generic URI syntax](https://tools.ietf.org/html/rfc3986#section-3). This
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includes `file:` and `filesystem:`.
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### `protocol.registerFileProtocol(scheme, handler[, completion])`
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* `scheme` String
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* `handler` Function
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* `completion` Function (optional)
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Registers a protocol of `scheme` that will send the file as a response. The
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`handler` will be called with `handler(request, callback)` when a `request` is
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going to be created with `scheme`. `completion` will be called with
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`completion(null)` when `scheme` is successfully registered or
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`completion(error)` when failed.
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To handle the `request`, the `callback` should be called with either the file's
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path or an object that has a `path` property, e.g. `callback(filePath)` or
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`callback({path: filePath})`.
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When `callback` is called with nothing, a number, or an object that has an
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`error` property, the `request` will fail with the `error` number you
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specified. For the available error numbers you can use, please see the
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[net error list](https://code.google.com/p/chromium/codesearch#chromium/src/net/base/net_error_list.h).
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By default the `scheme` is treated like `http:`, which is parsed differently
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than protocols that follow the "generic URI syntax" like `file:`, so you
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probably want to call `protocol.registerStandardSchemes` to have your scheme
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treated as a standard scheme.
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### `protocol.registerBufferProtocol(scheme, handler[, completion])`
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* `scheme` String
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* `handler` Function
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* `completion` Function (optional)
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Registers a protocol of `scheme` that will send a `Buffer` as a response. The
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`callback` should be called with either a `Buffer` object or an object that
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has the `data`, `mimeType`, and `chart` properties.
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Example:
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```javascript
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protocol.registerBufferProtocol('atom', function(request, callback) {
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callback({mimeType: 'text/html', data: new Buffer('<h5>Response</h5>')});
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}, function (error) {
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if (error)
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console.error('Failed to register protocol')
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});
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```
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### `protocol.registerStringProtocol(scheme, handler[, completion])`
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* `scheme` String
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* `handler` Function
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* `completion` Function (optional)
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Registers a protocol of `scheme` that will send a `String` as a response. The
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`callback` should be called with either a `String` or an object that has the
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`data`, `mimeType`, and `chart` properties.
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### `protocol.registerHttpProtocol(scheme, handler[, completion])`
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* `scheme` String
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* `handler` Function
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* `completion` Function (optional)
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Registers a protocol of `scheme` that will send an HTTP request as a response.
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The `callback` should be called with an object that has the `url`, `method`,
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`referer`, and `session` properties.
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By default the HTTP request will reuse the current session. If you want the
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request to have a different session you should set `session` to `null`.
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### `protocol.unregisterProtocol(scheme[, completion])`
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* `scheme` String
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* `completion` Function (optional)
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Unregisters the custom protocol of `scheme`.
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### `protocol.isProtocolHandled(scheme, callback)`
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* `scheme` String
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* `callback` Function
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The `callback` will be called with a boolean that indicates whether there is
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already a handler for `scheme`.
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### `protocol.interceptFileProtocol(scheme, handler[, completion])`
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* `scheme` String
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* `handler` Function
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* `completion` Function (optional)
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Intercepts `scheme` protocol and uses `handler` as the protocol's new handler
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which sends a file as a response.
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### `protocol.interceptStringProtocol(scheme, handler[, completion])`
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* `scheme` String
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* `handler` Function
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* `completion` Function (optional)
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Intercepts `scheme` protocol and uses `handler` as the protocol's new handler
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which sends a `String` as a response.
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## `protocol.interceptBufferProtocol(scheme, handler[, completion])`
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* `scheme` String
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* `handler` Function
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* `completion` Function (optional)
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Intercepts `scheme` protocol and uses `handler` as the protocol's new handler
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which sends a `Buffer` as a response.
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## `protocol.interceptHttpProtocol(scheme, handler[, completion])`
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* `scheme` String
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* `handler` Function
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* `completion` Function (optional)
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Intercepts `scheme` protocol and uses `handler` as the protocol's new handler
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which sends a new HTTP request as a response.
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## `protocol.uninterceptProtocol(scheme[, completion])`
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* `scheme` String
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* `completion` Function
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Remove the interceptor installed for `scheme` and restore its original handler.
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