Warn for insecure links

app/src/main/java/eu/faircode/email/AdapterMessage.java

@@ -1601,7 +1601,11 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             } else {
                 View view = LayoutInflater.from(context).inflate(R.layout.dialog_link, null);
                 final EditText etLink = view.findViewById(R.id.etLink);
+                TextView tvInsecure = view.findViewById(R.id.tvInsecure);
+
                 etLink.setText(uri.toString());
+                tvInsecure.setVisibility("http".equals(uri.getScheme()) ? View.VISIBLE : View.GONE);
+
                 new DialogBuilderLifecycle(context, owner)
                         .setView(view)
                         .setPositiveButton(R.string.title_yes, new DialogInterface.OnClickListener() {

app/src/main/java/eu/faircode/email/FragmentCompose.java

@@ -55,6 +55,7 @@ import android.text.SpannableString;
 import android.text.SpannableStringBuilder;
 import android.text.Spanned;
 import android.text.TextUtils;
+import android.text.TextWatcher;
 import android.text.style.ImageSpan;
 import android.text.style.QuoteSpan;
 import android.text.style.StyleSpan;
@@ -770,31 +771,44 @@ public class FragmentCompose extends FragmentBase {
     }
 
     private void onMenuStyle(int id) {
-        int start = etBody.getSelectionStart();
-        int end = etBody.getSelectionEnd();
-        if (start > end) {
-            int tmp = start;
-            start = end;
-            end = tmp;
+        int s = etBody.getSelectionStart();
+        int e = etBody.getSelectionEnd();
+
+        if (s < 0)
+            s = 0;
+        if (e < 0)
+            e = 0;
+
+        if (s > e) {
+            int tmp = s;
+            s = e;
+            e = tmp;
         }
-        if (start == end)
-            Snackbar.make(view, R.string.title_no_selection, Snackbar.LENGTH_LONG).show();
-        else {
-            final SpannableString s = new SpannableString(etBody.getText());
+
+        final int start = s;
+        final int end = e;
+
+        final SpannableString ss = new SpannableString(etBody.getText());
 
         switch (id) {
             case R.id.menu_bold:
-                    s.setSpan(new StyleSpan(Typeface.BOLD), start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
+                if (start == end)
+                    Snackbar.make(view, R.string.title_no_selection, Snackbar.LENGTH_LONG).show();
+                else
+                    ss.setSpan(new StyleSpan(Typeface.BOLD), start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                 break;
 
             case R.id.menu_italic:
-                    s.setSpan(new StyleSpan(Typeface.ITALIC), start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
+                if (start == end)
+                    Snackbar.make(view, R.string.title_no_selection, Snackbar.LENGTH_LONG).show();
+                else
+                    ss.setSpan(new StyleSpan(Typeface.ITALIC), start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                 break;
 
             case R.id.menu_clear:
-                    for (Object span : s.getSpans(start, end, Object.class))
+                for (Object span : ss.getSpans(0, ss.length(), Object.class))
                     if (!(span instanceof ImageSpan))
-                            s.removeSpan(span);
+                        ss.removeSpan(span);
                 break;
 
             case R.id.menu_link:
@@ -809,18 +823,35 @@ public class FragmentCompose extends FragmentBase {
                 }
 
                 View view = LayoutInflater.from(getContext()).inflate(R.layout.dialog_link, null);
-                    final int fStart = start;
-                    final int fEnd = end;
                 final EditText etLink = view.findViewById(R.id.etLink);
+                final TextView tvInsecure = view.findViewById(R.id.tvInsecure);
+
                 etLink.setText(uri == null ? "https://" : uri.toString());
+                tvInsecure.setVisibility(View.GONE);
+
+                etLink.addTextChangedListener(new TextWatcher() {
+                    @Override
+                    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+                    }
+
+                    @Override
+                    public void onTextChanged(CharSequence s, int start, int before, int count) {
+                        tvInsecure.setVisibility("http".equals(Uri.parse(s.toString()).getScheme()) ? View.VISIBLE : View.GONE);
+                    }
+
+                    @Override
+                    public void afterTextChanged(Editable s) {
+                    }
+                });
+
                 new DialogBuilderLifecycle(getContext(), getViewLifecycleOwner())
                         .setView(view)
                         .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                             @Override
                             public void onClick(DialogInterface dialog, int which) {
-                                    s.setSpan(new URLSpan(etLink.getText().toString()), fStart, fEnd, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
-                                    etBody.setText(s);
-                                    etBody.setSelection(fEnd);
+                                ss.setSpan(new URLSpan(etLink.getText().toString()), start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
+                                etBody.setText(ss);
+                                etBody.setSelection(end);
                             }
                         })
                         .show();
@@ -834,10 +865,9 @@ public class FragmentCompose extends FragmentBase {
                 return;
         }
 
-            etBody.setText(s);
+        etBody.setText(ss);
         etBody.setSelection(end);
     }
-    }
 
     private void onMenuSendAfter() {
         DialogDuration.show(getContext(), getViewLifecycleOwner(), R.string.title_send_at,

app/src/main/res/layout/dialog_link.xml

@@ -25,4 +25,17 @@
         android:textAppearance="@style/TextAppearance.AppCompat.Small"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@id/tvOpenLink" />
+
+    <TextView
+        android:id="@+id/tvInsecure"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="12dp"
+        android:text="@string/title_insecure_link"
+        android:textAppearance="@style/TextAppearance.AppCompat.Small"
+        android:textColor="?attr/colorWarning"
+        android:textStyle="bold"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/etLink" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/values/strings.xml

@@ -517,6 +517,7 @@
     <string name="title_hint_sync">Downloading messages can take some time, depending on the speed of the provider, internet connection and device and on the number of messages. While downloading messages the app might respond slower.</string>
 
     <string name="title_open_link">Open link</string>
+    <string name="title_insecure_link">This link is insecure</string>
     <string name="title_select_app">Select app</string>
     <string name="title_updated">There is an update to version %1$s available</string>
     <string name="title_issue">Do you have a question or problem?</string>