Gradle License Report

A plugin for generating reports about the licenses of the dependencies for your Gradle project. This plugin is a fork of https://github.com/RobertFischer/Gradle-License-Report.

This plugin will resolve all your dependencies, and then scour them for anything that looks like relevant licensing information. The theory is to automatically generate a report that you can hand to corporate IP lawyers in order to keep them busy.

Usage

Add this to your build.gradle file:

plugins {
  id 'com.github.jk1.dependency-license-report' version '0.4.1'
}

or via a buildscript block

buildscript {
    repositories {
        maven {
            url 'https://plugins.gradle.org/m2/'
        }  
    }

    dependencies {
        classpath 'gradle.plugin.com.github.jk1:gradle-license-report:0.4.1'
    }
}
apply plugin: 'com.github.jk1.dependency-license-report'

Then run gradle generateLicenseReport to generate your report in build/reports/dependency-license.

Configuration

Configuration described below is entirely optional.

licenseReport {
    // Set output directory for the report data. 
    // Defaults to ${project.buildDir}/reports/dependency-license.
    outputDir = "$projectDir/build/licenses"

    // List the groups ids to exclude from dependency report.
    // By default project's own group is excluded.
    // For finer granularity, see: excludes.
    excludeGroups = ['do.not.want'] 

    // List the ids (in module:name format) to exclude from dependency report.
    // By default excludes is empty.
    excludes = ['moduleGroup:moduleName']

    // Set custom report renderer, implementing ReportRenderer.
    // Yes, you can write your own to support any format necessary.
    renderer = new XmlReportRenderer('third-party-libs.xml', 'Back-End Libraries')

    // Set importers to import any external dependency information, i.e. from npm.
    // Custom importer should implement DependencyDataImporter interface.
    importers = [new XmlReportImporter('Frontend dependencies', file(frontend_libs.xml))]

    // Adjust the configurations to use, e.g. for Android projects.
    configurations = ['compile']
}

Renderers

Renderers define how a final dependency report will look like. Plugin comes with a number of predefined renderers for text, html, xml and other popular presentation formats. It's also possible to create a custom renderer for the report.

All the renderers support report file name customization via constructor parameter:

licenseReport {
    renderer = new XmlReportRenderer('third-party-libs.xml', 'Back-End Libraries')
}

InventoryHtmlReportRender

The InventoryHtmlReportRender renders a report grouped by license type so you can more easily identify which dependencies share the same license. This makes it easier to know the individual licenses you need to verify with your legal department. To use this report you simply add it to the configuration:

licenseReport {
    renderer = new InventoryHtmlReportRenderer()
}

This defaults to using the name of the project as the title and index.html as the name of the file it creates. You can change this by passing additional arguments. The first argument is the filename to write out, and the 2nd is the title to use in the report. For dependencies that don't declare their license they will be listed underneath the Unknown license group. You can provide the license information for these dependencies statically using the overridesFilename. The overrides file is a pipe-separated value file with the columns for Dependency Name,Project URL,License, and License URL, respectively. Here is an example of the contents of the override file:

com.google.code.gson:gson:2.5|https://github.com/google/gson|The Apache Software License, Version 2.0|https://github.com/google/gson/blob/master/LICENSE
org.springframework.security:spring-security-core:3.2.9.RELEASE|https://github.com/spring-projects/spring-security|The Apache Software License, Version 2.0|https://github.com/spring-projects/spring-security/blob/master/license.txt
org.springframework.security:spring-security-acl:3.2.9.RELEASE|https://github.com/spring-projects/spring-security|The Apache Software License, Version 2.0|https://github.com/spring-projects/spring-security/blob/master/license.txt

There are no column headers on this file. Here is the example of how to config the InventoryHtmlReportRenderer to use an overrides file:

licenseReport {
    renderer = new InventoryHtmlReportRenderer('index.html', 'Some Title', new File(projectDir,"../unknown-license-details.txt"))
}

Importers

Importer adds license information from an external source to your report. Importer may come in handy if

• some modules within your application use their own means of library dependency resolution, e.g. npm registry
• your application integrates third party components or services with their own library dependencies
• joint report for a multimodule project is required

The following example demonstrates how to use an importer:

licenseReport {
    // integrate javascript frontend dependencies into our report
    importers = [ new XmlReportImporter("Front End", new File(projectDir,"src/main/webapp/vendor/front_end.xml") ) ]
}

Writing custom renderers and importers

It's also possible to implement a custom importer to support any dependency data format necessary. To do so put custom importer implementation inside buildSrc folder:

package org.sample;

import com.github.jk1.license.ImportedModuleBundle;
import com.github.jk1.license.importer.DependencyDataImporter;
import java.util.Collection;

public class CustomImporter implements DependencyDataImporter{

    public String getImporterName() {
        return "Custom importer";
    }


    public Collection<ImportedModuleBundle> doImport() {
        throw new UnsupportedOperationException("Not implemented yet");
    }
}

with buildSrc/build.gradle defined as follows to get all the imports resolved:

apply plugin: 'java'

repositories {
    maven {
        url 'https://plugins.gradle.org/m2/'
    }
}

dependencies {
    compile 'gradle.plugin.com.github.jk1:gradle-license-report:0.4.1'
}

Now you can use your custom importer in the main build:

import org.sample.CustomImporter 

...

licenseReport {
    importers = [ new CustomImporter() ]
}

The same technique can be used to create a renderer to support custom report formats.