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/*
* Copyright 2018 Allan Wang
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ca.allanwang.kau.permissions
import android.app.Activity
import android.content.Context
import android.content.pm.PackageManager
import androidx.core.app.ActivityCompat
import ca.allanwang.kau.kotlin.kauRemoveIf
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 val pendingResults = mutableListOf<WeakReference<PermissionResult>>()
/**
* Retrieve permissions requested in our manifest
*/
private val manifestPermission = lazyContext<Set<String>> {
try {
it.packageManager.getPackageInfo(
it.packageName,
PackageManager.GET_PERMISSIONS
)?.requestedPermissions?.toSet()
?: emptySet()
} catch (e: Exception) {
emptySet()
}
}
/**
* Registers a new permission request.
* It is expected that the callback will be called eventually, unless the parent activity is destroyed.
*/
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 (pendingResults.size == 1) {
requestPermissions(context, missingPermissions.toTypedArray())
} else {
KL.d { "Request is postponed since another one is still in progress; did you remember to override onRequestPermissionsResult?" }
}
}
/**
* Checks that the listed permissions can be requested, and submits the request to the provided activity
*/
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)
pendingResults.kauRemoveIf {
val action = it.get()
action == null || (0 until count).any { i -> action.onResult(permissions[i], grantResults[i]) }
}
val action = pendingResults.asSequence().map { it.get() }.firstOrNull { it != null }
if (action == null) { // actions have been unlinked from their weak references
pendingResults.clear()
return
}
requestPermissions(context, action.permissions.toTypedArray())
}
}
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