Implementing Crashlytics on a multiflavour and multi-key environment

Script

final File fabricFile = file("fabric.properties")

afterEvaluate {
    android.applicationVariants.all { variant ->
        final String variantName = variant.getName().capitalize()
        final Task targetTask = tasks["process${variantName}Manifest"]
        if (fabricTask != null) {
            final Task generateFabricFile = task("generateFabricFile$variantName") {
                doLast {
                    String fabricApiSecret = 'verySecretApiSecretForEveryoneGuessItsNotThatSecret'
                    String fabricApiKey = 'veryKeyApiKeyForEveryone'

                    if (variantName.equalsIgnoreCase("DifferentClientDebug") || variantName.equalsIgnoreCase("DifferentClientRelease")) {
                        fabricApiSecret = 'verySecretApiSecretForDifferentClient'
                        fabricApiKey = 'veryKeyApiKeyForDifferentClient'
                    }

                    if (fabricFile.exists()) {
                        println "Deleting previous configuration File for Fabric (variant: $variantName)"
                        fabricFile.delete()
                    }

                    println '*** FABRIC DATA ***'
                    println "apiSecret=$fabricApiSecret"
                    println "apiKey=$fabricApiKey"
                    println '*******************'

                    def commentMessage = "Autogenerated Fabric properties for Crashlytics"

                    ant.propertyfile(file: fabricFile, comment: commentMessage) {
                        entry(key: "apiSecret", value: fabricApiSecret)
                        entry(key: "apiKey", value: fabricApiKey)
                    }
                }
            }
            targetTask.dependsOn generateFabricFile
        }
    }
}