sails.registerActionMiddleware()
This feature is still experimental.
This method is still under development, and its interface and/or behavior could change at any time.
Register a new action middleware function that will be applied to actions with the specified identities.
sails.registerActionMiddleware(actionMiddlewareFns, actionIdentities);
Action middleware functions are essentially policies that you declare programmatically (rather than via sails.config.policies). In fact, policies are implemented under-the-hood using action middleware. The registerActionMiddleware() method is mainly useful in custom hooks as a way of adding new policies to an app.
Usage
| Argument | Type | Details | |
|---|---|---|---|
| 1 | actionMiddlewareFns | One or more middleware functions to register. Action middleware (like policies) must be functions which accept req, res and next arguments. |
|
| 2 | actionIdentities | An expression that indicates the action or actions that the action middleware should apply to. Use * at the end for a wildcard; e.g. user/* will apply to any actions whose identities begin with user/. Use a ! at the beginning to indicate that the action middleware should NOT apply to the actions specified by the expression, e.g. !user/foo or !user/*. Multiple identity expressions can be specified by separating with a comma, e.g. pets/count,user/*,!user/tickle |
The
actionIdentitiesargument expects the identities to be expressed as if they were standalone actions. To apply action middleware to actions inside of a controller file (e.g.UserController.js), simply refer to the lower-cased version of the filename without "Controller" (e.g.user).
Example
As an example of action middleware that might be applied in a custom hook, imagine a page view counter (this code might be added to the initialize method of the hook):
// Declare a local var to hold the number of views for each URL.
var pageViews = {};
// Register middleware to record each page view.
sails.registerActionMiddleware(
// First argument is the middleware to run
function countPage (req, res, next) {
// Initialize the page counter to zero if this is the first time we've seen this URL.
pageViews[req.url] = pageViews[req.url] || 0;
// Increment the page counter.
pageViews[req.url]++;
// Add the current page count to the request, so that it can be used in other middleware / actions.
req.currentPageCount = pageViews[req.url];
// Continue to the next matching middleware / action
next();
},
// Second argument is the actions to apply the middleware to. In this case, we want the
// hook to apply to all actions EXCEPT the `show-page-views` action supplied by this hook.
'*, !page-view-hook/show-page-views'
);
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Reference
- Application
- Blueprint API
- Command-line interface
-
Configuration
- sails.config.*
- sails.config.blueprints
- sails.config.bootstrap()
- sails.config.custom
- sails.config.datastores
- sails.config.globals
- sails.config.http
- sails.config.i18n
- sails.config.log
- sails.config.models
- sails.config.policies
- sails.config.routes
- sails.config.security
- sails.config.session
- sails.config.sockets
- sails.config.views
-
Request (`req`)
- req._startTime
- req.body
- req.cookies
- req.fresh
- req.headers
- req.hostname
- req.ip
- req.ips
- req.isSocket
- req.method
- req.options
- req.originalUrl
- req.params
- req.path
- req.protocol
- req.query
- req.secure
- req.signedCookies
- req.socket
- req.subdomains
- req.url
- req.wantsJSON
- req.xhr
- req.accepts()
- req.acceptsCharsets()
- req.acceptsLanguages()
- req.allParams()
- req.file()
- req.get()
- req.is()
- req.param()
- req.setLocale()
- req.setTimeout()
- req.host
- Response (`res`)
- Waterline (ORM)
- WebSockets
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