This simple plugin allows you to load properties (such as API keys) from .properties files into project extras.

First of all, load plugin in your root project's build.gradle file:

plugins {
    id "io.github.fobo66.propertiesloader" version "1.0"
}

For Kotlin DSL:

plugins {
    id("io.github.fobo66.propertiesloader") version "1.0"
}

Then you need to specify .properties files for the plugin:

propertiesLoader {
    propertiesFiles.from(project.file("api.properties"))
}

Given api.properties has the following content:

testkey=CHANGE_ME

Then you can access testkey via project extras in your tasks. In Groovy DSL:

ext.testkey
// or for task context
project.ext.testkey

For Kotlin DSL:

val testkey : String by extra
// or for task context
val testkey = project.extensions.extraProperties.get("testkey")

To see an example of how to use this plugin, see functional tests. There are all the needed properties defined in test cases in build.gradle "files".