Continue structural port from Spring Boot to Undertow

- Notification template generator
- Add tests for email notification handler

src/main/java/io/kamax/mxisd/threepid/generator/GenericTemplateNotificationGenerator.java

@@ -27,11 +27,16 @@ import io.kamax.mxisd.config.threepid.medium.GenericTemplateConfig;
 import io.kamax.mxisd.exception.InternalServerError;
 import io.kamax.mxisd.invitation.IThreePidInviteReply;
 import io.kamax.mxisd.threepid.session.IThreePidSession;
-import org.apache.commons.lang.StringUtils;
+import org.apache.commons.io.IOUtils;
+import org.apache.commons.lang3.StringUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.FileInputStream;
 import java.io.IOException;
+import java.io.InputStream;
+import java.net.URI;
+import java.nio.charset.StandardCharsets;
 
 public abstract class GenericTemplateNotificationGenerator extends PlaceholderNotificationGenerator implements NotificationGenerator {
 
@@ -46,13 +51,14 @@ public abstract class GenericTemplateNotificationGenerator extends PlaceholderNo
 
     private String getTemplateContent(String location) {
         try {
-            // FIXME make it work again
-            /*
-            InputStream is = StringUtils.startsWith(location, "classpath:") ?
-                    app.getResource(location).getInputStream() : new FileInputStream(location);
+            URI loc = URI.create(location);
+            InputStream is;
+            if (StringUtils.equals("classpath", loc.getScheme())) {
+                is = getClass().getResourceAsStream(loc.getSchemeSpecificPart());
+            } else {
+                is = new FileInputStream(location);
+            }
             return IOUtils.toString(is, StandardCharsets.UTF_8);
-            */
-            throw new IOException("Not implemented!");
         } catch (IOException e) {
             throw new InternalServerError("Unable to read template content at " + location + ": " + e.getMessage());
         }