Add support for backing up wallpapers.

app/src/main/java/org/thoughtcrime/securesms/util/ProtoExtensions.kt

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2024 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.thoughtcrime.securesms.util
+
+import com.google.protobuf.InvalidProtocolBufferException
+import com.squareup.wire.ProtoAdapter
+
+/**
+ * Performs the common pattern of attempting to decode a serialized proto and returning null if it fails to decode.
+ */
+fun <E> ProtoAdapter<E>.decodeOrNull(serialized: ByteArray): E? {
+  return try {
+    this.decode(serialized)
+  } catch (e: InvalidProtocolBufferException) {
+    null
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/util/UriUtil.java

@@ -1,33 +0,0 @@
-package org.thoughtcrime.securesms.util;
-
-import android.content.ContentResolver;
-import android.content.Context;
-import android.net.Uri;
-
-import androidx.annotation.NonNull;
-
-import java.io.File;
-import java.io.IOException;
-
-public final class UriUtil {
-
-  /**
-   * Ensures that an external URI is valid and doesn't contain any references to internal files or
-   * any other trickiness.
-   */
-  public static boolean isValidExternalUri(@NonNull Context context, @NonNull Uri uri) {
-    if (ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
-      try {
-        File file = new File(uri.getPath());
-
-        return file.getCanonicalPath().equals(file.getPath()) &&
-               !file.getCanonicalPath().startsWith("/data")   &&
-               !file.getCanonicalPath().contains(context.getPackageName());
-      } catch (IOException e) {
-        return false;
-      }
-    } else {
-      return true;
-    }
-  }
-}

app/src/main/java/org/thoughtcrime/securesms/util/UriUtil.kt

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2024 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.thoughtcrime.securesms.util
+
+import android.content.ContentResolver
+import android.content.Context
+import android.net.Uri
+import java.io.File
+import java.io.IOException
+
+object UriUtil {
+
+  /**
+   * Ensures that an external URI is valid and doesn't contain any references to internal files or
+   * any other trickiness.
+   */
+  @JvmStatic
+  fun isValidExternalUri(context: Context, uri: Uri): Boolean {
+    if (ContentResolver.SCHEME_FILE == uri.scheme) {
+      try {
+        val file = File(uri.path)
+
+        return file.canonicalPath == file.path &&
+          !file.canonicalPath.startsWith("/data") &&
+          !file.canonicalPath.contains(context.packageName)
+      } catch (e: IOException) {
+        return false
+      }
+    } else {
+      return true
+    }
+  }
+
+  /**
+   * Parses a string to a URI if it's valid, otherwise null.
+   */
+  fun parseOrNull(uri: String): Uri? {
+    return try {
+      Uri.parse(uri)
+    } catch (e: Exception) {
+      null
+    }
+  }
+}