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https://github.com/mohiva/play-html-compressor

Google's HTML Compressor for Play Framework 2
https://github.com/mohiva/play-html-compressor

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Google's HTML Compressor for Play Framework 2

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README 

        
# This project is not maintained anymore.



A fork can be found under: https://github.com/fkoehler/play-html-compressor



# Google's HTML (and XML) Compressor for Play Framework 2 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.mohiva/play-html-compressor_2.11/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.mohiva/play-html-compressor_2.11) [![Build Status](https://travis-ci.org/mohiva/play-html-compressor.png)](https://travis-ci.org/mohiva/play-html-compressor)

[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/mohiva/play-html-compressor?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)



## Installation



In your project/Build.scala:

```scala

libraryDependencies ++= Seq(

  "com.mohiva" %% "play-html-compressor" % "0.7.1"

)

```



### History



* For Play Framework 2.6 use version 0.7.1

* For Play Framework 2.5 use version 0.6.3

* For Play Framework 2.4 use version 0.5.0

* For Play Framework 2.3 use version 0.3.1

* For Play Framework 2.2 use version 0.2.1

* For Play Framework 2.1 use version 0.1-SNAPSHOT



## How to use



The filter comes with built-in `HtmlCompressor` and `XmlCompressor`

configurations, but it can also be used with user-defined configurations. The

following two examples shows how to define the filters with the default and the

user-defined configurations.



To provide the filters for your application you must define it as described in the Play

Documentation ([Scala](https://www.playframework.com/documentation/2.6.x/ScalaHttpFilters#Using-filters), [Java](https://www.playframework.com/documentation/2.6.x/JavaHttpFilters#Using-filters)).



### Provide filters



#### For Scala users



```scala

import javax.inject.Inject



import com.mohiva.play.htmlcompressor.HTMLCompressorFilter

import com.mohiva.play.xmlcompressor.XMLCompressorFilter

import play.api.http.HttpFilters

import play.api.mvc.EssentialFilter



class Filters @Inject() (

  htmlCompressorFilter: HTMLCompressorFilter,

  xmlCompressorFilter: XMLCompressorFilter)

  extends HttpFilters {



  override def filters: Seq[EssentialFilter] = Seq(

    htmlCompressorFilter,

    xmlCompressorFilter

  )

}

```



#### For Java users



```java

import com.mohiva.play.htmlcompressor.HTMLCompressorFilter;

import com.mohiva.play.xmlcompressor.XMLCompressorFilter;

import play.mvc.EssentialFilter;

import play.http.HttpFilters;



import javax.inject.Inject;



public class DefaultFilter implements HttpFilters {



    private HTMLCompressorFilter htmlCompressorFilter;

    private XMLCompressorFilter xmlCompressorFilter;



    @Inject

    public DefaultFilter(

        HTMLCompressorFilter htmlCompressorFilter,

        XMLCompressorFilter xmlCompressorFilter) {



        this.htmlCompressorFilter = htmlCompressorFilter;

        this.xmlCompressorFilter = xmlCompressorFilter;

    }



    @Override

    public EssentialFilter[] filters() {

        return new EssentialFilter[] {

            htmlCompressorFilter.asJava(),

            xmlCompressorFilter.asJava()

        };

    }

}



```



### Default filter



For the default filters we provide DI modules which will be automatically enabled if you

pull in the dependency. You must only provide your instance of `HttpFilters` as described

above.



### User-defined filter



For user defined filters there is a little bit mor to do. First you must create your instances of

the filter. As next you must provide your instance of `HttpFilters` as described above. At last

you must provide the bindings for you created filter and disable the default DI modules.



#### Implement filters



##### For Scala users



```scala

import javax.inject.Inject



import akka.stream.Materializer

import com.googlecode.htmlcompressor.compressor.HtmlCompressor

import com.mohiva.play.htmlcompressor.HTMLCompressorFilter

import play.api.{Configuration, Environment, Mode}



class CustomHTMLCompressorFilter @Inject() (

  val configuration: Configuration, environment: Environment, val mat: Materializer)

  extends HTMLCompressorFilter {



  override val compressor: HtmlCompressor = {

    val c = new HtmlCompressor()

    if (environment.mode == Mode.Dev) {

      c.setPreserveLineBreaks(true)

    }



    c.setRemoveComments(true)

    c.setRemoveIntertagSpaces(false)

    c.setRemoveHttpProtocol(true)

    c.setRemoveHttpsProtocol(true)

    c

  }

}



```



##### For Java users



```java

import akka.stream.Materializer;

import com.googlecode.htmlcompressor.compressor.HtmlCompressor;

import com.mohiva.play.htmlcompressor.HTMLCompressorFilter;

import play.Environment;

import play.Mode;

import play.api.Configuration;



import javax.inject.Inject;



public class CustomHTMLCompressorFilter extends HTMLCompressorFilter {



    private Configuration configuration;

    private Environment environment;

    private Materializer mat;



    @Inject

    public CustomHTMLCompressorFilter(

        Configuration configuration, Environment environment, Materializer mat) {



        this.configuration = configuration;

        this.environment = environment;

        this.mat = mat;

    }



    @Override

    public Configuration configuration() {

        return configuration;

    }



    @Override

    public HtmlCompressor compressor() {

        HtmlCompressor compressor = new HtmlCompressor();

        if (environment.mode() == Mode.DEV) {

            compressor.setPreserveLineBreaks(true);

        }



        compressor.setRemoveComments(true);

        compressor.setRemoveIntertagSpaces(true);

        compressor.setRemoveHttpProtocol(true);

        compressor.setRemoveHttpsProtocol(true);



        return compressor;

    }



    @Override

    public Materializer mat() {

        return mat;

    }



}



```



#### Provide bindings



To provide your bindings for your user defined filter you must either create a new module

or you can add the binding to your default DI module. This process is detailed documented

for [Scala](https://www.playframework.com/documentation/2.6.x/ScalaDependencyInjection) and

[Java](https://www.playframework.com/documentation/2.6.x/JavaDependencyInjection) users. So

please refer to this documentation.



##### Disable default modules



To disable the default modules you must append the modules to the `play.modules.disabled` property in `application.conf`:



```scala

play.modules.disabled += "com.mohiva.play.htmlcompressor.HTMLCompressorFilterModule"

play.modules.disabled += "com.mohiva.play.xmlcompressor.XMLCompressorFilterModule"

```



### Customize filter behaviour



You have the possibility to customize filter behaviour without using class inheritance. For

that, you could adding the following keys on your `application.conf` file :



```scala

play.filters {



  # Mohiva Compressor

  # ~~~~~

  # https://github.com/mohiva/play-html-compressor

  compressor {

    html {

      preserveLineBreaks = false

      removeComments = true

      removeIntertagSpaces = false

      removeHttpProtocol = true

      removeHttpsProtocol = true

    }



    xml {

      removeComments = true

      removeIntertagSpaces = true

    }

  }

}

```