Initial creation of the Permission Manager

6 files changed, 143 insertions, 6 deletions

diff --git a/library/src/main/kotlin/ca/allanwang/kau/iitems/KotlinIItem.kt b/library/src/main/kotlin/ca/allanwang/kau/iitems/KotlinIItem.kt
new file mode 100644
index 0000000..7e4bda6
--- /dev/null
+++ b/library/src/main/kotlin/ca/allanwang/kau/iitems/KotlinIItem.kt
@@ -0,0 +1,23 @@
+package ca.allanwang.kau.iitems
+
+import android.support.annotation.LayoutRes
+import android.support.v7.widget.RecyclerView
+import android.view.View
+import com.mikepenz.fastadapter.IClickable
+import com.mikepenz.fastadapter.IItem
+import com.mikepenz.fastadapter.items.AbstractItem
+
+/**
+ * Created by Allan Wang on 2017-07-03.
+ *
+ * Kotlin implementation of the [AbstractItem] to make things shorter
+ */
+open class KotlinIItem<Item, VH : RecyclerView.ViewHolder>(
+        private val type: Int,
+        @param:LayoutRes private val layoutRes: Int,
+        private val viewHolder: (v: View) -> VH
+) : AbstractItem<Item, VH>() where Item : IItem<*, *>, Item : IClickable<*> {
+    override final fun getType(): Int = type
+    override final fun getViewHolder(v: View): VH = viewHolder(v)
+    override final fun getLayoutRes(): Int = layoutRes
+}
\ No newline at end of file
diff --git a/library/src/main/kotlin/ca/allanwang/kau/permissions/PermissionManager.kt b/library/src/main/kotlin/ca/allanwang/kau/permissions/PermissionManager.kt
new file mode 100644
index 0000000..7181e2c
--- /dev/null
+++ b/library/src/main/kotlin/ca/allanwang/kau/permissions/PermissionManager.kt
@@ -0,0 +1,57 @@
+package ca.allanwang.kau.permissions
+
+import android.app.Activity
+import android.content.Context
+import android.support.v4.app.ActivityCompat
+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 java.lang.ref.WeakReference
+
+/**
+ * Created by Allan Wang on 2017-07-03.
+ */
+internal object PermissionManager {
+
+    var requestInProgress = false
+    val pendingResults: MutableList<WeakReference<PermissionResult>> by lazy { mutableListOf<WeakReference<PermissionResult>>() }
+
+    operator fun invoke(context: Context, permissions: Array<out String>, callback: (granted: Boolean, deniedPerm: String?) -> Unit) {
+        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")
+    }
+
+    @Synchronized internal fun requestPermissions(context: Context, permissions: Array<String>) {
+        val activity = (context as? Activity) ?: throw KauException("Context is not an instance of an activity; cannot request permissions")
+        ActivityCompat.requestPermissions(activity, permissions, 1)
+    }
+
+    fun onRequestPermissionsResult(context: Context, permissions: Array<String>, grantResults: IntArray) {
+        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]) ?: true })
+                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())
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/library/src/main/kotlin/ca/allanwang/kau/permissions/PermissionResult.kt b/library/src/main/kotlin/ca/allanwang/kau/permissions/PermissionResult.kt
new file mode 100644
index 0000000..14bfdff
--- /dev/null
+++ b/library/src/main/kotlin/ca/allanwang/kau/permissions/PermissionResult.kt
@@ -0,0 +1,26 @@
+package ca.allanwang.kau.permissions
+
+import android.content.pm.PackageManager
+
+/**
+ * Created by Allan Wang on 2017-07-03.
+ */
+class PermissionResult(permissions: Array<out String>, val callback: (granted: Boolean, deniedPerm: String?) -> Unit) {
+    val permissions = mutableSetOf(*permissions)
+
+    /**
+     * Called from the manager whenever a permission has changed
+     * Returns true if result is completed, false otherwise
+     */
+    fun onResult(permission: String, result: Int): Boolean {
+        if (result != PackageManager.PERMISSION_GRANTED) {
+            callback(false, permission)
+            permissions.clear()
+            return true
+        }
+        permissions.remove(permission)
+        if (permissions.isNotEmpty()) return false
+        callback(true, null)
+        return true
+    }
+}
\ No newline at end of file
diff --git a/library/src/main/kotlin/ca/allanwang/kau/permissions/Permissions.kt b/library/src/main/kotlin/ca/allanwang/kau/permissions/Permissions.kt
new file mode 100644
index 0000000..d466cb3
--- /dev/null
+++ b/library/src/main/kotlin/ca/allanwang/kau/permissions/Permissions.kt
@@ -0,0 +1,26 @@
+package ca.allanwang.kau.permissions
+
+import android.app.Activity
+import android.content.Context
+
+/**
+ * Created by Allan Wang on 2017-07-02.
+ *
+ * Bindings for the permission manager
+ */
+
+/**
+ * Hook that should be added inside all [Activity.onRequestPermissionsResult] so that the Permission manager can handle the responses
+ */
+fun Activity.kauOnRequestPermissionsResult(permissions: Array<String>, grantResults: IntArray)
+        = PermissionManager.onRequestPermissionsResult(this, permissions, grantResults)
+
+/**
+ * Request a permission with a callback
+ * In reality, an activity is needed to fulfill the request, but a context is enough if those permissions are already granted
+ * To be safe, you may want to check that the context can be casted successfully first
+ * The [callback] returns [granted], which is true if all permissions are granted
+ * [deniedPerm] is the first denied permission, if granted is false
+ */
+fun Context.requestPermissions(vararg permissions: String, callback: (granted: Boolean, deniedPerm: String?) -> Unit)
+        = PermissionManager(this, permissions, callback)
\ No newline at end of file
diff --git a/library/src/main/kotlin/ca/allanwang/kau/utils/ContextUtils.kt b/library/src/main/kotlin/ca/allanwang/kau/utils/ContextUtils.kt
index c56a09d..21021e2 100644
--- a/library/src/main/kotlin/ca/allanwang/kau/utils/ContextUtils.kt
+++ b/library/src/main/kotlin/ca/allanwang/kau/utils/ContextUtils.kt
@@ -4,6 +4,7 @@ import android.app.Activity
 import android.app.ActivityOptions
 import android.content.Context
 import android.content.Intent
+import android.content.pm.PackageManager
 import android.graphics.drawable.Drawable
 import android.net.ConnectivityManager
 import android.net.Uri
@@ -131,13 +132,13 @@ fun Context.resolveString(@AttrRes attr: Int, fallback: String = ""): String {
  * Wrapper function for the MaterialDialog adapterBuilder
  * There is no need to call build() or show() as those are done by default
  */
-fun Context.materialDialog(action: MaterialDialog.Builder.() -> Unit): MaterialDialog {
+inline fun Context.materialDialog(action: MaterialDialog.Builder.() -> Unit): MaterialDialog {
     val builder = MaterialDialog.Builder(this)
     builder.action()
     return builder.show()
 }
 
-val Context.isNetworkAvailable: Boolean
+inline val Context.isNetworkAvailable: Boolean
     get() {
         val connectivityManager = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
         val activeNetworkInfo = connectivityManager.activeNetworkInfo
@@ -146,17 +147,19 @@ val Context.isNetworkAvailable: Boolean
 
 fun Context.getDip(value: Float): Float = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, value, resources.displayMetrics)
 
-val Context.isRtl: Boolean
+inline val Context.isRtl: Boolean
     get() = resources.configuration.layoutDirection == View.LAYOUT_DIRECTION_RTL
 
 /**
  * Determine if the navigation bar will be on the bottom of the screen, based on logic in
  * PhoneWindowManager.
  */
-val Context.isNavBarOnBottom: Boolean
+inline val Context.isNavBarOnBottom: Boolean
     get() {
         val cfg = resources.configuration
         val dm = resources.displayMetrics
         val canMove = dm.widthPixels != dm.heightPixels && cfg.smallestScreenWidthDp < 600
         return !canMove || dm.widthPixels < dm.heightPixels
-    }
\ No newline at end of file
+    }
+
+fun Context.hasPermission(permissions: String) = !buildIsMarshmallowAndUp || ContextCompat.checkSelfPermission(this, permissions) == PackageManager.PERMISSION_GRANTED
\ No newline at end of file
diff --git a/library/src/main/kotlin/ca/allanwang/kau/utils/Utils.kt b/library/src/main/kotlin/ca/allanwang/kau/utils/Utils.kt
index aa0736e..84794f9 100644
--- a/library/src/main/kotlin/ca/allanwang/kau/utils/Utils.kt
+++ b/library/src/main/kotlin/ca/allanwang/kau/utils/Utils.kt
@@ -106,4 +106,6 @@ inline fun <T : AutoCloseable, R> T.use(block: (T) -> R): R {
 
 fun postDelayed(delay: Long, action: () -> Unit) {
     Handler().postDelayed(action, delay)
-}
\ No newline at end of file
+}
+
+class KauException(message: String) : RuntimeException(message)
\ No newline at end of file