Refactoring keywords

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

@@ -311,30 +311,6 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
     private static final int MAX_QUOTE_LEVEL = 3;
     private static final int MAX_TRANSLATABLE_TEXT_SIZE = 50 * 1024;
 
-    // https://www.iana.org/assignments/imap-jmap-keywords/imap-jmap-keywords.xhtml
-    private static final List<String> IMAP_KEYWORDS_BLACKLIST = Collections.unmodifiableList(Arrays.asList(
-            MessageHelper.FLAG_FORWARDED.toLowerCase(Locale.ROOT),
-            "$MDNSent".toLowerCase(Locale.ROOT), // https://tools.ietf.org/html/rfc3503
-            "$SubmitPending".toLowerCase(Locale.ROOT),
-            "$Submitted".toLowerCase(Locale.ROOT),
-            "$Junk".toLowerCase(Locale.ROOT),
-            "$NotJunk".toLowerCase(Locale.ROOT),
-            "Junk".toLowerCase(Locale.ROOT),
-            "NonJunk".toLowerCase(Locale.ROOT),
-            "$recent".toLowerCase(Locale.ROOT),
-            "DTAG_document".toLowerCase(Locale.ROOT),
-            "DTAG_image".toLowerCase(Locale.ROOT),
-            "$X-Me-Annot-1".toLowerCase(Locale.ROOT),
-            "$X-Me-Annot-2".toLowerCase(Locale.ROOT),
-            "\\Unseen".toLowerCase(Locale.ROOT), // Mail.ru
-            "$sent".toLowerCase(Locale.ROOT), // Kmail
-            "$attachment".toLowerCase(Locale.ROOT), // Kmail
-            "$signed".toLowerCase(Locale.ROOT), // Kmail
-            "$encrypted".toLowerCase(Locale.ROOT), // Kmail
-            "$Classified".toLowerCase(Locale.ROOT),
-            "$HasNoAttachment".toLowerCase(Locale.ROOT)
-    ));
-
     public class ViewHolder extends RecyclerView.ViewHolder implements
             View.OnClickListener,
             View.OnLongClickListener,
@@ -5332,8 +5308,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
         private SpannableStringBuilder getKeywords(TupleMessageEx message) {
             SpannableStringBuilder keywords = new SpannableStringBuilder();
             for (int i = 0; i < message.keywords.length; i++) {
-                String k = message.keywords[i].toLowerCase(Locale.ROOT);
-                if (!IMAP_KEYWORDS_BLACKLIST.contains(k)) {
+                if (MessageHelper.showKeyword(message.keywords[i])) {
                     if (keywords.length() > 0)
                         keywords.append(" ");
 

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

@@ -1272,7 +1272,7 @@ class Core {
                 // Mark not spam
                 if (EntityFolder.JUNK.equals(folder.type)
                         && ifolder.getPermanentFlags().contains(Flags.Flag.USER)) {
-                    Flags notJunk = new Flags("$NotJunk");
+                    Flags notJunk = new Flags(MessageHelper.FLAG_NOT_JUNK);
                     imessage.setFlags(notJunk, true);
                 }
             }
@@ -3414,7 +3414,7 @@ class Core {
                         !EntityFolder.TRASH.equals(folder.type) &&
                         !EntityFolder.JUNK.equals(folder.type) &&
                         message.blocklist != null && message.blocklist &&
-                        !Arrays.asList(message.keywords).contains("$NotJunk")) {
+                        !Arrays.asList(message.keywords).contains(MessageHelper.FLAG_NOT_JUNK)) {
                     boolean use_blocklist = prefs.getBoolean("use_blocklist", false);
                     if (use_blocklist) {
                         EntityLog.log(context, "Block list" +

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

@@ -121,7 +121,6 @@ public class MessageHelper {
     static final int SMALL_MESSAGE_SIZE = 192 * 1024; // bytes
     static final int DEFAULT_DOWNLOAD_SIZE = 4 * 1024 * 1024; // bytes
     static final String HEADER_CORRELATION_ID = "X-Correlation-ID";
-    static final String FLAG_FORWARDED = "$Forwarded";
 
     private static final int MAX_HEADER_LENGTH = 998;
     private static final int MAX_MESSAGE_SIZE = 10 * 1024 * 1024; // bytes
@@ -135,6 +134,34 @@ public class MessageHelper {
             StandardCharsets.UTF_16LE
     ));
 
+    static final String FLAG_FORWARDED = "$Forwarded";
+    static final String FLAG_NOT_JUNK = "$NotJunk";
+
+    // https://www.iana.org/assignments/imap-jmap-keywords/imap-jmap-keywords.xhtml
+    // Not black listed: Gmail $Phishing
+    private static final List<String> FLAG_BLACKLIST = Collections.unmodifiableList(Arrays.asList(
+            MessageHelper.FLAG_FORWARDED,
+            MessageHelper.FLAG_NOT_JUNK,
+            "$MDNSent", // https://tools.ietf.org/html/rfc3503
+            "$SubmitPending",
+            "$Submitted",
+            "$Junk",
+            "Junk",
+            "NonJunk",
+            "$recent",
+            "DTAG_document",
+            "DTAG_image",
+            "$X-Me-Annot-1",
+            "$X-Me-Annot-2",
+            "\\Unseen", // Mail.ru
+            "$sent", // Kmail
+            "$attachment", // Kmail
+            "$signed", // Kmail
+            "$encrypted", // Kmail
+            "$HasNoAttachment",
+            "$Classified" // FairEmail
+    ));
+
     // https://tools.ietf.org/html/rfc4021
 
     static void setSystemProperties(Context context) {
@@ -915,6 +942,18 @@ public class MessageHelper {
         return keywords.toArray(new String[0]);
     }
 
+    static boolean showKeyword(String keyword) {
+        if (BuildConfig.DEBUG)
+            return true;
+
+        int len = FLAG_BLACKLIST.size();
+        for (int i = 0; i < len; i++)
+            if (FLAG_BLACKLIST.get(i).equalsIgnoreCase(keyword))
+                return false;
+
+        return true;
+    }
+
     String getMessageID() throws MessagingException {
         ensureEnvelope();