Decode Sensitivity header

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

@@ -6396,6 +6396,10 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                     same = false;
                     log("ui_importance changed", next.id);
                 }
+                if (!Objects.equals(prev.sensitivity, next.sensitivity)) {
+                    same = false;
+                    log("sensitivity changed", next.id);
+                }
                 if (!Objects.equals(prev.receipt_request, next.receipt_request)) {
                     same = false;
                     log("receipt_request changed", next.id);

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

@@ -2852,6 +2852,7 @@ class Core {
                         message.deliveredto = helper.getDeliveredTo();
                         message.thread = helper.getThreadId(context, account.id, folder.id, 0);
                         message.priority = helper.getPriority();
+                        message.sensitivity = helper.getSensitivity();
                         message.auto_submitted = helper.getAutoSubmitted();
                         message.receipt_request = helper.getReceiptRequested();
                         message.receipt_to = helper.getReceiptTo();
@@ -3833,6 +3834,7 @@ class Core {
             if (BuildConfig.DEBUG && message.thread.startsWith("outlook:"))
                 message.warning = message.thread;
             message.priority = helper.getPriority();
+            message.sensitivity = helper.getSensitivity();
 
             for (String keyword : keywords)
                 if (MessageHelper.FLAG_LOW_IMPORTANCE.equals(keyword))

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

@@ -71,7 +71,7 @@ import io.requery.android.database.sqlite.SQLiteDatabase;
 // https://developer.android.com/topic/libraries/architecture/room.html
 
 @Database(
-        version = 220,
+        version = 221,
         entities = {
                 EntityIdentity.class,
                 EntityAccount.class,
@@ -2239,6 +2239,12 @@ public abstract class DB extends RoomDatabase {
                         logMigration(startVersion, endVersion);
                         db.execSQL("ALTER TABLE `message` ADD COLUMN `tls` INTEGER");
                     }
+                }).addMigrations(new Migration(220, 221) {
+                    @Override
+                    public void migrate(@NonNull SupportSQLiteDatabase db) {
+                        logMigration(startVersion, endVersion);
+                        db.execSQL("ALTER TABLE `message` ADD COLUMN `sensitivity` INTEGER");
+                    }
                 }).addMigrations(new Migration(998, 999) {
                     @Override
                     public void migrate(@NonNull SupportSQLiteDatabase db) {

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

@@ -104,6 +104,10 @@ public class EntityMessage implements Serializable {
     static final Integer PRIORITIY_NORMAL = 1;
     static final Integer PRIORITIY_HIGH = 2;
 
+    static final Integer SENSITIVITY_PERSONAL = 1;
+    static final Integer SENSITIVITY_PRIVATE = 2;
+    static final Integer SENSITIVITY_CONFIDENTIAL = 3;
+
     static final Integer DSN_NONE = 0;
     static final Integer DSN_RECEIPT = 1;
     static final Integer DSN_HARD_BOUNCE = 2;
@@ -139,6 +143,7 @@ public class EntityMessage implements Serializable {
     public String thread; // compose = null
     public Integer priority;
     public Integer importance;
+    public Integer sensitivity;
     public Boolean auto_submitted;
     @ColumnInfo(name = "receipt")
     public Integer dsn;
@@ -562,6 +567,8 @@ public class EntityMessage implements Serializable {
                     Objects.equals(this.wasforwardedfrom, other.wasforwardedfrom) &&
                     Objects.equals(this.thread, other.thread) &&
                     Objects.equals(this.priority, other.priority) &&
+                    Objects.equals(this.importance, other.importance) &&
+                    Objects.equals(this.sensitivity, other.sensitivity) &&
                     Objects.equals(this.dsn, other.dsn) &&
                     Objects.equals(this.receipt_request, other.receipt_request) &&
                     MessageHelper.equal(this.receipt_to, other.receipt_to) &&

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

@@ -1583,6 +1583,27 @@ public class MessageHelper {
         return priority;
     }
 
+    Integer getSensitivity() throws MessagingException {
+        ensureHeaders();
+
+        // https://www.rfc-editor.org/rfc/rfc4021.html#section-2.1.55
+        String header = imessage.getHeader("Sensitivity", null);
+
+        if (TextUtils.isEmpty(header))
+            return null;
+
+        header = header.toLowerCase(Locale.ROOT);
+
+        if (header.contains("personal"))
+            return EntityMessage.SENSITIVITY_PERSONAL;
+        if (header.contains("private"))
+            return EntityMessage.SENSITIVITY_PRIVATE;
+        if (header.contains("company")) // company-confidential
+            return EntityMessage.SENSITIVITY_CONFIDENTIAL;
+
+        return null;
+    }
+
     Boolean getAutoSubmitted() throws MessagingException {
         // https://tools.ietf.org/html/rfc3834
         String header = imessage.getHeader("Auto-Submitted", null);