OpenSignInAuthenticator.kt

package com.commit451.gitlab.api

import android.content.Intent
import android.os.Build
import android.provider.DocumentsContract
import android.widget.Toast
import com.commit451.gitlab.App
import com.commit451.gitlab.R
import com.commit451.gitlab.activity.LoginActivity
import com.commit451.gitlab.data.Prefs
import com.commit451.gitlab.model.Account
import com.commit451.gitlab.providers.FileProvider
import com.commit451.gitlab.util.ThreadUtil
import okhttp3.Authenticator
import okhttp3.Request
import okhttp3.Response
import okhttp3.Route
import timber.log.Timber
import java.io.IOException

/**
 * If it detects a 401, redirect the user to the login screen, clearing activity the stack.
 * Kinda a weird global way of forcing the user to the login screen if their auth has expired
 */
class OpenSignInAuthenticator(private val account: Account) : Authenticator {

    @Throws(IOException::class)
    override fun authenticate(route: Route?, response: Response): Request? {
        val url = response.request().url()

        var cleanUrl = url.toString().toLowerCase()
        cleanUrl = cleanUrl.substring(cleanUrl.indexOf(':'))

        var cleanServerUrl = account.serverUrl.toString().toLowerCase()
        cleanServerUrl = cleanServerUrl.substring(cleanServerUrl.indexOf(':'))

        //Ensure that we only check urls of the gitlab instance
        if (cleanUrl.startsWith(cleanServerUrl)) {
            //Special case for if someone just put in their username or password wrong
            if ("session" != url.pathSegments()[url.pathSegments().size - 1]) {
                //Off the background thread
                Timber.wtf(RuntimeException("Got a 401 and showing sign in for url: " + response.request().url()))
                ThreadUtil.postOnMainThread(Runnable {
                    //Remove the account, so that the user can sign in again
                    Prefs.removeAccount(account)

                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                        App.get().applicationContext.contentResolver.notifyChange(DocumentsContract.buildRootsUri(FileProvider.getAuthority()), null)
                    }

                    Toast.makeText(App.get(), R.string.error_401, Toast.LENGTH_LONG)
                            .show()
                    val intent = LoginActivity.newIntent(App.get())
                    intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
                    App.get().startActivity(intent)
                })
            }
        }
        return null
    }
}