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connect-inject

connect-inject

connect middleware for adding any script to the response, this is a forked version of connect-livereload.

This is a slightly modified version of connect-livereload all the credits go to the author.

For further documentation refer to the author's repo connect-livereload.

install

npm install connect-inject --save-dev
git clone https://github.com/danielhq/connect-inject.git

use

this middleware can be used to inject any sort of content into the webpage e.g. [Livereload, Weinre etc]

  snippet: string | Array

snippet now accepts either string or an array. ## connect/express example

  app.use(require('connect-inject')({
    snippet: "<script>alert('hello world');</script>"
  }));

options

Options are not mandatory: app.use(require('connect-inject')()); The Options have to be provided when the middleware is loaded:

e.g.:

  app.use(require('connect-inject')({
    snippet: "<script>alert('hello world');</script>",
    ignore: ['.js', '.svg']
  }));
 

These are the available options with the following defaults:

  // these files will be ignored 
  ignore: ['.js', '.css', '.svg', '.ico', '.woff', '.png', '.jpg', '.jpeg'],
 
  // this function is used to determine if the content of `res.write` or `res.end` is html. 
  html: function (str) {
    return /<[:_-\w\s\!\/\=\"\']+>/i.test(str);
  },
 
  // rules are provided to find the place where the snippet should be inserted. 
  // the main problem is that on the server side it can be tricky to determine if a string will be valid html on the client. 
  // the function `fn` of the first `match` is executed like this `body.replace(rule.match, rule.fn);` 
  // the function `fn` has got the arguments `fn(w, s)` where `w` is the matches string and `s` is the snippet. 
  rules: [{
    match: /<\/body>/,
    fn: prepend
  }, {
    match: /<\/html>/,
    fn: prepend
  }, {
    match: /<\!DOCTYPE.+>/,
    fn: append
  }],
 
 
  // snippet taks a string argument which can be anything you want, and will be appended (by default) before </body> tag 
  snippet: "<script>alert('hello world');</script>"

grunt example

The following example is from an actual Gruntfile that uses grunt-contrib-connect

connect: {
  options: {
    port: 3000,
    hostname: 'localhost'
  },
  dev: {
    options: {
      middleware: function (connect) {
        return [
          require('connect-inject')({ snippet: "<script>alert('hello world');</script>"}),
          mountFolder(connect, '.tmp'),
          mountFolder(connect, 'app')
        ];
      }
    }
  }
}

For use as middleware in grunt simply add the following to the top of your array of middleware.

  require('connect-inject')(),

You can pass in options to this call if you do not want the defaults.

dev is simply the name of the server being used with the task grunt connect:dev. The other items in the middleware array are all functions that either are of the form function (req, res, next) like checkForDownload or return that like mountFolder(connect, 'something').

multiple injections

You can also do multiple injections by defining a snippet inside of a rule and setting the runAll option to true

{
    runAll: true,
    rules: [
        {
            match: /<head>/ig,
            snippet: '<script src="/top_file.js"></script>',
            fn: function(w, s) {
                return w + s;
            }
        },
        {
            match: /<script .* src=".*\.test\.js"><\/script>/ig,
            snippet: [
              '<script src="/bottomFile1.js"></script>',
              '<script src="/bottomFile2.js"></script>',
              '<script src="/src-test/testUtils.js"></script>'
            ]
            fn: function(w, s) {
                return s + w;
            }
        }
    ]
}

credits

This is a slightly modified version of connect-livereload all the credits go to the author.

license

MIT License

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