backbone for i18n support (#55)

pom.xml

@@ -467,6 +467,7 @@
 										<source>${basedir}/src/main/webapp/templates</source>
 										<prefix>templates/</prefix>
 										<destination>${basedir}/target/generated-sources/angularjs/all-templates.html</destination>
+										<i18nPath>${basedir}/src/main/resources/i18n/</i18nPath>
 									</properties>
 									<scriptpath>
 										<element>${basedir}/src/main/script</element>
@@ -477,8 +478,11 @@
 										project.properties['prefix'];
 										def dest =
 										project.properties['destination'];
+										def i18n =
+										project.properties['i18nPath'];
 										new
-										HTMLConcat().concat(source, prefix, dest);
+										HTMLConcat().concat(source,
+										prefix, dest, i18n);
 									</source>
 								</configuration>
 							</execution>

src/main/java/com/commafeed/frontend/utils/InternationalizationDevelopmentFilter.java

@@ -0,0 +1,132 @@
+package com.commafeed.frontend.utils;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Locale;
+import java.util.Properties;
+import java.util.ResourceBundle;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import javax.servlet.Filter;
+import javax.servlet.FilterChain;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletException;
+import javax.servlet.ServletOutputStream;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletResponse;
+import javax.servlet.http.HttpServletResponseWrapper;
+
+import org.apache.commons.io.IOUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.commafeed.frontend.CommaFeedSession;
+
+/**
+ * Replace variables from templates on the fly in dev mode only. In production
+ * the substitution is done at build-time.
+ * 
+ */
+public class InternationalizationDevelopmentFilter implements Filter {
+
+	private static Logger log = LoggerFactory
+			.getLogger(InternationalizationDevelopmentFilter.class);
+
+	private boolean production = true;
+
+	@Override
+	public void doFilter(ServletRequest request, ServletResponse response,
+			FilterChain chain) throws IOException, ServletException {
+
+		if (production) {
+			chain.doFilter(request, response);
+			return;
+		}
+
+		final ServletOutputStream wrapper = new ServletOutputStreamWrapper();
+		ServletResponse interceptor = new HttpServletResponseWrapper(
+				(HttpServletResponse) response) {
+
+			@Override
+			public ServletOutputStream getOutputStream() throws IOException {
+				return wrapper;
+			}
+		};
+		chain.doFilter(request, interceptor);
+		Locale locale = CommaFeedSession.get().getLocale();
+
+		byte[] bytes = translate(wrapper.toString(), locale).getBytes();
+		response.getOutputStream().write(bytes);
+		response.setContentLength(bytes.length);
+		response.getOutputStream().close();
+
+	}
+
+	private String translate(String content, Locale locale) {
+		Properties props = new Properties();
+		InputStream is = null;
+		try {
+			is = getClass().getResourceAsStream(
+					"/i18n/" + locale.getLanguage() + ".properties");
+			if (is == null) {
+				is = getClass().getResourceAsStream("/i18n/en.properties");
+			}
+			if (is == null) {
+				throw new Exception("Locale file not found for locale "
+						+ locale.getLanguage());
+			}
+			props.load(is);
+		} catch (Exception e) {
+			log.error(e.getMessage(), e);
+		} finally {
+			IOUtils.closeQuietly(is);
+		}
+
+		return replace(content, props);
+	}
+
+	private static final Pattern PATTERN = Pattern.compile("\\$\\{(.+?)\\}");
+
+	public String replace(String content, Properties props) {
+		Matcher m = PATTERN.matcher(content);
+		StringBuffer sb = new StringBuffer();
+		while (m.find()) {
+			String var = m.group(1);
+			Object replacement = props.get(var);
+			m.appendReplacement(sb, replacement.toString());
+		}
+		m.appendTail(sb);
+		return sb.toString();
+	}
+
+	@Override
+	public void init(FilterConfig filterConfig) throws ServletException {
+		String prod = ResourceBundle.getBundle("application").getString(
+				"production");
+		production = Boolean.valueOf(prod);
+	}
+
+	@Override
+	public void destroy() {
+		// do nothing
+	}
+
+	private static class ServletOutputStreamWrapper extends ServletOutputStream {
+
+		private ByteArrayOutputStream baos = new ByteArrayOutputStream();
+
+		@Override
+		public void write(int b) throws IOException {
+			baos.write(b);
+		}
+
+		@Override
+		public String toString() {
+			return baos.toString();
+		}
+	}
+
+}

src/main/resources/i18n/en.properties

@@ -0,0 +1 @@
+toolbar.refresh=Refresh

src/main/resources/i18n/fr.properties

@@ -0,0 +1 @@
+toolbar.refresh=Rafraichir

src/main/script/HTMLConcat.groovy

@@ -3,26 +3,50 @@ import java.io.IOException;
 
 import org.apache.commons.io.FileUtils;
 import org.apache.commons.lang.SystemUtils;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 public class HTMLConcat {
-	public void concat(String source, String prefix, String destination)
+	
+	private static final Pattern PATTERN = Pattern.compile('\\$\\{(.+?)\\}');
+	
+	public void concat(String source, String prefix, String destination, String i18nPath)
 			throws IOException {
+		for(File i18n : new File(i18nPath).listFiles()) {
 			StringBuilder sb = new StringBuilder();
 			sb.append("<div>");
 			for (File file : new File(source).listFiles()) {
-			if (file.isFile()) {
 				sb.append(SystemUtils.LINE_SEPARATOR);
 				sb.append(String.format(
 						"<script type=\"text/ng-template\" id=\"%s%s\">",
 						prefix, file.getName()));
 				sb.append(SystemUtils.LINE_SEPARATOR);
-				sb.append(FileUtils.readFileToString(file));
+				sb.append(translate(FileUtils.readFileToString(file), i18n));
 				sb.append(SystemUtils.LINE_SEPARATOR);
 				sb.append("</script>");
 				sb.append(SystemUtils.LINE_SEPARATOR);
 			}
-		}
 			sb.append("</div>");
-		FileUtils.writeStringToFile(new File(destination), sb.toString());
+			String dest = destination.substring(0, destination.lastIndexOf(".")) + "." + i18n.getName().split("\\.")[0] + ".html";
+			FileUtils.writeStringToFile(new File(dest), sb.toString());
+		}
+	}
+	
+	public String translate(String content, File i18n) {
+		 Properties props = new Properties();
+		 props.load(new FileInputStream(i18n));
+		 return replace(content, props);
+	}
+	
+	public String replace(String content, Properties props) {
+		Matcher m = PATTERN.matcher(content);
+		StringBuffer sb = new StringBuffer();
+		while (m.find()) {
+			String var = m.group(1);
+			Object replacement = props.get(var);
+			m.appendReplacement(sb, replacement.toString());
+		}
+		m.appendTail(sb);
+		return sb.toString();
 	}
 }

src/main/webapp/WEB-INF/web.xml

@@ -15,6 +15,10 @@
 		<filter-name>WebResourceOptimizer</filter-name>
 		<filter-class>ro.isdc.wro.http.WroFilter</filter-class>
 	</filter>
+	<filter>
+		<filter-name>i18n</filter-name>
+		<filter-class>com.commafeed.frontend.utils.InternationalizationDevelopmentFilter</filter-class>
+	</filter>
 
 	<filter-mapping>
 		<filter-name>WebResourceOptimizer</filter-name>
@@ -24,6 +28,10 @@
 		<filter-name>Wicket</filter-name>
 		<url-pattern>/*</url-pattern>
 	</filter-mapping>
+	<filter-mapping>
+		<filter-name>i18n</filter-name>
+		<url-pattern>/templates/*</url-pattern>
+	</filter-mapping>
 	
 	<listener>
 		<listener-class>com.commafeed.frontend.resources.WroListener</listener-class>

src/main/webapp/templates/_toolbar.html

@@ -15,7 +15,7 @@
 				<button type="button" class="btn" ng-model="settingsService.settings.viewMode" btn-radio="'expanded'"><i class="icon-th-list"></i></button>
 			</div>
 			
-			<button type="button" class="btn" ng-click="refresh()"><i class="icon-refresh"></i> Refresh</button>
+			<button type="button" class="btn" ng-click="refresh()"><i class="icon-refresh"></i> ${toolbar.refresh}</button>
 			<button type="button" class="btn" ng-click="markAllAsRead()"><i class="icon-ok"></i> Mark all as read</button>
 		
 			<div class="btn-group">