simple-middleware
A package implementing the middleware pattern.
Example Usage
/**
* A library for returning base64 representation of image of *any* kind
*/
var Middleware = require("simple-middleware")
imageToBase64Middleware = new Middleware()
imageToBase64Middleware.use(function (context, next) {
context.imageExtension = getExtensionFromFileName(context.fileName)
return next()
})
// if jpeg
imageToBase64Middleware.use(function (context, next) {
if (context.imageExtension === 'jpeg' || context.imageExtension === 'jpg') {
// code for jpeg to Base64 goes here
return result
} else {
return next()
}
})
// if png
imageToBase64Middleware.use(function (context, next) {
...
})
...
// if tiff
imageToBase64Middleware.use(function (context, next) {
if (context.imageExtension === 'tiff') {
// code for tiff to Base64 goes here
return result
} else {
return next() // if there is no next(), null is returned
}
})
// add more code here in future when support for another new image type is needed
module.exports = function (fileName, imageFileContents) {
return imageToBase64Middleware.run({imageFileContents : imageFileContents, fileName: fileName})
}Installation
If you want to use this in node.js, simply install via npm using npm install simple-middleware and in
your code use it by var Middleware = require("simple-middleware")
If you want to use this in browser, simply download the compose-simple-middleware.js and simple-middleware.js files
in that order and include it via a script tag. The module exposes a global variable called Middleware.
Examples
See test/test.js file and this test file
from a sister project for examples of how to use this package.
License
MIT License. See LICENSE file.
