[#477] Hiding sensitive clipboard information

* [#477] Hiding sensitive clipboard information

Closes #477

* [#477] Hiding sensitive clipboard information from api <33

Closes #477

* [#477] Code cleanup

Closes #477

* Changelog update

---------

Co-authored-by: Honza <rychnovsky.honza@gmail.com>

CHANGELOG.md

@@ -10,6 +10,9 @@ and this application adheres to [Semantic Versioning](https://semver.org/spec/v2
 - A new What's New screen has been added, accessible from the About screen. It contains the release notes parsed 
   from the new [docs/whatsNew/WHATS_NEW_EN.md] file
 - These release notes and release priority are both propagated to every new Google Play release using CI logic
+- Copying sensitive information like addresses, transaction IDs, or wallet secrets into the device clipboard is now 
+  masked out from the system visual confirmation, but it's still copied as expected. `ClipDescription.EXTRA_IS_SENSITIVE`
+flag is used on Android SDK level 33 and higher, masking out the `Toast` text on levels below it.  
 
 ### Changed
 - The About screen has been redesigned to align with the new design guidelines

docs/whatsNew/WHATS_NEW_EN.md

@@ -11,6 +11,8 @@ directly impact users rather than highlighting other key architectural updates.*
 
 ### Added
 - A new What's New screen has been added, accessible from the About screen
+- Copying sensitive information like addresses, transaction IDs, or wallet secrets into the device clipboard is now 
+  masked out from the system visual confirmation, but it's still copied as expected.
 
 ### Changed
 - The About screen has been redesigned to align with the new design guidelines

spackle-android-lib/src/main/kotlin/co/electriccoin/zcash/spackle/ClipboardManagerExt.kt

@@ -1,13 +0,0 @@
-@file:Suppress("ktlint:standard:filename")
-
-package co.electriccoin.zcash.spackle
-
-import android.content.ClipData
-import android.content.ClipboardManager
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.withContext
-
-suspend fun ClipboardManager.setPrimaryClipSuspend(data: ClipData) =
-    withContext(Dispatchers.IO) {
-        setPrimaryClip(data)
-    }

spackle-android-lib/src/main/kotlin/co/electriccoin/zcash/spackle/ClipboardManagerUtil.kt

@@ -1,35 +1,46 @@
 package co.electriccoin.zcash.spackle
 
 import android.content.ClipData
+import android.content.ClipDescription
 import android.content.ClipboardManager
 import android.content.Context
+import android.os.PersistableBundle
 import android.widget.Toast
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.runBlocking
 
 object ClipboardManagerUtil {
+    private val extraIsSensitive: String
+        get() =
+            if (AndroidApiVersion.isAtLeastT) {
+                ClipDescription.EXTRA_IS_SENSITIVE
+            } else {
+                "android.content.extra.IS_SENSITIVE"
+            }
+
     fun copyToClipboard(
         context: Context,
         label: String,
         value: String
     ) {
         Twig.info { "Copied to clipboard: label: $label, value: $value" }
-        val clipboardManager = context.getSystemService(ClipboardManager::class.java)
+        val clipboardManager = context.getSystemService<ClipboardManager>()
         val data =
-            ClipData.newPlainText(
-                label,
-                value
-            )
+            ClipData.newPlainText(label, value).apply {
+                description.extras =
+                    PersistableBundle().apply {
+                        putBoolean(extraIsSensitive, true)
+                    }
+            }
         if (AndroidApiVersion.isAtLeastT) {
             // API 33 and later implement their system Toast UI.
             clipboardManager.setPrimaryClip(data)
         } else {
             // Blocking call is fine here, as we just moved to the IO thread to satisfy theStrictMode on an older API
-            runBlocking { clipboardManager.setPrimaryClipSuspend(data) }
-            Toast.makeText(
-                context,
-                value,
-                Toast.LENGTH_SHORT
-            ).show()
+            runBlocking(Dispatchers.IO) {
+                clipboardManager.setPrimaryClip(data)
+            }
+            Toast.makeText(context, context.getString(R.string.hide_clipboard_placeholder), Toast.LENGTH_SHORT).show()
         }
     }
 }

spackle-android-lib/src/main/kotlin/co/electriccoin/zcash/spackle/ContextExt.kt

@@ -20,3 +20,5 @@ suspend fun Context.getInternalCacheDirSuspend(subDirectory: String?): File =
     withContext(Dispatchers.IO) {
         (subDirectory?.let { File(cacheDir, subDirectory) } ?: cacheDir).apply { mkdirsSuspend() }
     }
+
+inline fun <reified T> Context.getSystemService(): T = getSystemService(T::class.java)

spackle-android-lib/src/main/res/values/strings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="hide_clipboard_placeholder" translatable="false">******</string>
+</resources>