Escape file name before guessing mime type (#13)

Fixes storj-archived/android-libstorj#24

src/main/java/io/storj/libstorj/File.java

@@ -18,6 +18,8 @@
 
 import java.io.Serializable;
 import java.net.URLConnection;
+import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
 import java.util.Objects;
 
 /**
@@ -175,12 +177,21 @@ public long getSize() {
      * @return a guess of the content type based on the file name
      */
     public String getMimeType() {
+        String mime = null;
+
         // prefer the Java util as libstorj returns always 'application/octet-stream'
-        String mime = URLConnection.guessContentTypeFromName(name);
+        try {
+            String escaped = URLEncoder.encode(name, StandardCharsets.UTF_8.toString());
+            mime = URLConnection.guessContentTypeFromName(escaped);
+        } catch (Exception e) {
+            // mime will remain null
+        }
+
         if (mime == null || mime.isEmpty()) {
             // fallback to libstorj
             mime = mimeType;
         }
+
         return mime;
     }
 

src/test/java/io/storj/libstorj/FileTest.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2018 Kaloyan Raev
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package io.storj.libstorj;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class FileTest {
+
+    @Test
+    public void testMimeType() {
+        File file = new File("file-id", "bucket-id", "A#BC.pdf", null, true, 1, null, null,
+                null, null);
+        Assert.assertEquals("application/pdf", file.getMimeType());
+    }
+
+}