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package ca.allanwang.kau.permissions
import android.app.Activity
import android.content.Context
import android.content.pm.PackageManager
import android.support.v4.app.ActivityCompat
import ca.allanwang.kau.kotlin.lazyContext
import ca.allanwang.kau.logging.KL
import ca.allanwang.kau.utils.KauException
import ca.allanwang.kau.utils.buildIsMarshmallowAndUp
import ca.allanwang.kau.utils.hasPermission
import ca.allanwang.kau.utils.toast
import java.lang.ref.WeakReference
/**
* Created by Allan Wang on 2017-07-03.
*
* Permission manager that is decoupled from activities
* Keeps track of pending requests, and warns about invalid requests
*/
internal object PermissionManager {
private var requestInProgress = false
private val pendingResults: MutableList<WeakReference<PermissionResult>> by lazy { mutableListOf<WeakReference<PermissionResult>>() }
/**
* Retrieve permissions requested in our manifest
*/
private val manifestPermission = lazyContext<Array<String>> {
try {
it.packageManager.getPackageInfo(it.packageName, PackageManager.GET_PERMISSIONS)?.requestedPermissions ?: emptyArray()
} catch (e: Exception) {
emptyArray()
}
}
operator fun invoke(context: Context, permissions: Array<out String>, callback: (granted: Boolean, deniedPerm: String?) -> Unit) {
KL.d { "Permission manager for: ${permissions.contentToString()}" }
if (!buildIsMarshmallowAndUp) return callback(true, null)
val missingPermissions = permissions.filter { !context.hasPermission(it) }
if (missingPermissions.isEmpty()) return callback(true, null)
pendingResults.add(WeakReference(PermissionResult(permissions, callback = callback)))
if (!requestInProgress) {
requestInProgress = true
requestPermissions(context, missingPermissions.toTypedArray())
} else KL.d { "Request is postponed since another one is still in progress; did you remember to override onRequestPermissionsResult?" }
}
@Synchronized private fun requestPermissions(context: Context, permissions: Array<out String>) {
permissions.forEach {
if (!manifestPermission(context).contains(it)) {
KL.e { "Requested permission $it is not stated in the manifest" }
context.toast("$it is not in the manifest")
//we'll let the request pass through so it can be denied and so the callback can be triggered
}
}
val activity = (context as? Activity) ?: throw KauException("Context is not an instance of an activity; cannot request permissions")
KL.i { "Requesting permissions ${permissions.contentToString()}" }
ActivityCompat.requestPermissions(activity, permissions, 1)
}
/**
* Handles permission result by allowing accepted permissions for all pending requests
* Also cleans up destroyed or completed pending requests
*/
fun onRequestPermissionsResult(context: Context, permissions: Array<out String>, grantResults: IntArray) {
KL.i { "On permission result: pending ${pendingResults.size}" }
val count = Math.min(permissions.size, grantResults.size)
val iter = pendingResults.iterator()
while (iter.hasNext()) {
val action = iter.next().get()
if ((0 until count).any { action?.onResult(permissions[it], grantResults[it]) != false })
iter.remove()
}
if (pendingResults.isEmpty())
requestInProgress = false
else {
val action = pendingResults.map { it.get() }.firstOrNull { it != null }
if (action == null) { //actions have been unlinked from their weak references
pendingResults.clear()
requestInProgress = false
return
}
requestPermissions(context, action.permissions.toTypedArray())
}
KL.i { "Post on permission result: pending ${pendingResults.size}" }
}
}
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