kotlin DSL retrieving keys from other file

Question

I am trying to switch my gradle files to Kotlin DSL. My project is making call to an API.

In build.gradle(app) I had a function to retrieve an api key stored in an other file keys.properties.

After some problem (for example) I rewrote the function to get the key. I wrote the following function in build.gradle.kts:

import import java.io.File

fun readFileLineByLineUsingForEachLine2(fileName: String): HashMap<String, String>{
    val items = HashMap<String, String>()

    File(fileName).forEachLine {
        items[it.split("=")[0]] = it.split("=")[1]
    }

    return items
}

Then I set a variable to hold the value of a particular key:

buildConfigField(String!, "API_KEY", returnMapOfKeys()["API_KEY"])

After fixing some errors I am stuck with the following one:

app/build.gradle.kts:49:36: Expecting ')'

which point on the line above with buildConfigField.

Does someone know where is this error ?

Or does someone know how to retrieve keys from files with Kotlin DSL ?

Answer 1

I solved my problem (it seems so.. check the edit!!). I ended up with the following function:

// Retrieve key for api
fun getApiKey(): String {
    val items = HashMap<String, String>()
    val f = File("keys.properties")

    f.forEachLine {
        items[it.split("=")[0]] = it.split("=")[1]
    }

    return items["API_KEY"]!!
}

And then I call buildConfigField as follow:

buildConfigField("String", "API_KEY", getApiKey())

There are no errors anymore on this part.

Edit

Once I have fixed all errors in the build.gradle.kts, the build of my project return that the file keys.properties could not be found: I had to fix my function getApiKey. Finally I could build and run my project with the following implementation:

// Return value of api key stored in `app/keys.properties`
fun getApiKey(): String {
    val items = HashMap<String, String>()

    val fl = rootProject.file("app/keys.properties")

    (fl.exists())?.let {
        fl.forEachLine {
            items[it.split("=")[0]] = it.split("=")[1]
        }
    }

    return items["API_KEY"]!!
}

This function is far to be good with all its hardcoded stuff but it allows to build my project.

Answer 2

In your kts file, first import

import java.io.FileInputStream
import java.io.FileNotFoundException
import java.util.Properties

then you can do this:

fun getApiKey(): String {
    val fl = rootProject.file("gradle.properties") <- the path for the file where your key is.

    if (fl.exists()) {
        val properties = Properties()
        properties.load(FileInputStream(fl))
        return properties.getProperty("API_KEY") <- the name your give to it
    } else {
        throw FileNotFoundException()
    }
}

Now you call use it: buildConfigField("String", "API_KEY", getApiKey())