Serviceless rewrite, part 1

Signed-off-by: Samuel Holland <samuel@sholland.org>

app/src/main/java/com/wireguard/android/widget/KeyInputFilter.java

@@ -0,0 +1,47 @@
+package com.wireguard.android.widget;
+
+import android.text.InputFilter;
+import android.text.SpannableStringBuilder;
+import android.text.Spanned;
+
+import com.wireguard.crypto.KeyEncoding;
+
+/**
+ * InputFilter for entering WireGuard private/public keys encoded with base64.
+ */
+
+public class KeyInputFilter implements InputFilter {
+    public static KeyInputFilter newInstance() {
+        return new KeyInputFilter();
+    }
+
+    @Override
+    public CharSequence filter(final CharSequence source,
+                               final int sStart, final int sEnd,
+                               final Spanned dest,
+                               final int dStart, final int dEnd) {
+        SpannableStringBuilder replacement = null;
+        int rIndex = 0;
+        final int dLength = dest.length();
+        for (int sIndex = sStart; sIndex < sEnd; ++sIndex) {
+            final char c = source.charAt(sIndex);
+            final int dIndex = dStart + (sIndex - sStart);
+            // Restrict characters to the base64 character set.
+            // Ensure adding this character does not push the length over the limit.
+            if (((dIndex + 1 < KeyEncoding.KEY_LENGTH_BASE64 && isAllowed(c)) ||
+                    (dIndex + 1 == KeyEncoding.KEY_LENGTH_BASE64 && c == '=')) &&
+                    dLength + (sIndex - sStart) < KeyEncoding.KEY_LENGTH_BASE64) {
+                ++rIndex;
+            } else {
+                if (replacement == null)
+                    replacement = new SpannableStringBuilder(source, sStart, sEnd);
+                replacement.delete(rIndex, rIndex + 1);
+            }
+        }
+        return replacement;
+    }
+
+    private boolean isAllowed(final char c) {
+        return Character.isLetterOrDigit(c) || c == '+' || c == '/';
+    }
+}

app/src/main/java/com/wireguard/android/widget/NameInputFilter.java

@@ -0,0 +1,46 @@
+package com.wireguard.android.widget;
+
+import android.text.InputFilter;
+import android.text.SpannableStringBuilder;
+import android.text.Spanned;
+
+import com.wireguard.android.model.Tunnel;
+
+/**
+ * InputFilter for entering WireGuard configuration names (Linux interface names).
+ */
+
+public class NameInputFilter implements InputFilter {
+    public static NameInputFilter newInstance() {
+        return new NameInputFilter();
+    }
+
+    @Override
+    public CharSequence filter(final CharSequence source,
+                               final int sStart, final int sEnd,
+                               final Spanned dest,
+                               final int dStart, final int dEnd) {
+        SpannableStringBuilder replacement = null;
+        int rIndex = 0;
+        final int dLength = dest.length();
+        for (int sIndex = sStart; sIndex < sEnd; ++sIndex) {
+            final char c = source.charAt(sIndex);
+            final int dIndex = dStart + (sIndex - sStart);
+            // Restrict characters to those valid in interfaces.
+            // Ensure adding this character does not push the length over the limit.
+            if ((dIndex < Tunnel.NAME_MAX_LENGTH && isAllowed(c)) &&
+                    dLength + (sIndex - sStart) < Tunnel.NAME_MAX_LENGTH) {
+                ++rIndex;
+            } else {
+                if (replacement == null)
+                    replacement = new SpannableStringBuilder(source, sStart, sEnd);
+                replacement.delete(rIndex, rIndex + 1);
+            }
+        }
+        return replacement;
+    }
+
+    private boolean isAllowed(final char c) {
+        return Character.isLetterOrDigit(c) || "_=+.-".indexOf(c) >= 0;
+    }
+}

app/src/main/java/com/wireguard/android/widget/ToggleSwitch.java

@@ -17,17 +17,15 @@
 package com.wireguard.android.widget;
 
 import android.content.Context;
+import android.os.Parcelable;
 import android.util.AttributeSet;
 import android.widget.Switch;
 
 public class ToggleSwitch extends Switch {
     private boolean hasPendingStateChange;
+    private boolean isRestoringState;
     private OnBeforeCheckedChangeListener listener;
 
-    public interface OnBeforeCheckedChangeListener {
-        void onBeforeCheckedChanged(ToggleSwitch toggleSwitch, boolean checked);
-    }
-
     public ToggleSwitch(final Context context) {
         super(context);
     }
@@ -45,21 +43,25 @@ public class ToggleSwitch extends Switch {
         super(context, attrs, defStyleAttr, defStyleRes);
     }
 
-    public void setOnBeforeCheckedChangeListener(final OnBeforeCheckedChangeListener listener) {
-        this.listener = listener;
+    @Override
+    public void onRestoreInstanceState(final Parcelable state) {
+        isRestoringState = true;
+        super.onRestoreInstanceState(state);
+        isRestoringState = false;
+
     }
 
     @Override
     public void setChecked(final boolean checked) {
-        if (listener != null) {
-            if (!isEnabled())
-                return;
-            setEnabled(false);
-            hasPendingStateChange = true;
-            listener.onBeforeCheckedChanged(this, checked);
-        } else {
+        if (isRestoringState || listener == null) {
             super.setChecked(checked);
+            return;
         }
+        if (hasPendingStateChange)
+            return;
+        hasPendingStateChange = true;
+        setEnabled(false);
+        listener.onBeforeCheckedChanged(this, checked);
     }
 
     public void setCheckedInternal(final boolean checked) {
@@ -69,4 +71,12 @@ public class ToggleSwitch extends Switch {
         }
         super.setChecked(checked);
     }
+
+    public void setOnBeforeCheckedChangeListener(final OnBeforeCheckedChangeListener listener) {
+        this.listener = listener;
+    }
+
+    public interface OnBeforeCheckedChangeListener {
+        void onBeforeCheckedChanged(ToggleSwitch toggleSwitch, boolean checked);
+    }
 }