1 files changed, 48 insertions, 0 deletions
diff --git a/juick-www/src/main/java/com/juick/www/HelpService.java b/juick-www/src/main/java/com/juick/www/HelpService.java
new file mode 100644
index 00000000..8ece4cfb
--- /dev/null
+++ b/juick-www/src/main/java/com/juick/www/HelpService.java
@@ -0,0 +1,48 @@
+package com.juick.www;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.commons.lang3.StringUtils;
+import org.springframework.cache.annotation.Cacheable;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+import java.util.regex.Pattern;
+
+/**
+ * Created by aalexeev on 12/11/16.
+ */
+public class HelpService {
+    private static final Pattern LANG_PATTERN = Pattern.compile("[a-z]{2}");
+
+    private static final Pattern PAGE_PATTERN = Pattern.compile("[a-zA-Z0-9\\-_]+");
+
+    private final String helpPath;
+
+
+    public HelpService(String helpPath) {
+        this.helpPath = helpPath;
+    }
+
+    @Cacheable("help")
+    public String getHelp(final String page, final String lang) {
+        if (canBePage(page) && canBeLang(lang)) {
+            String path = StringUtils.joinWith("/", helpPath, lang, page);
+
+            try (InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream(path)) {
+                if (is != null)
+                    return IOUtils.toString(is, StandardCharsets.UTF_8);
+            } catch (IOException e) {
+            }
+        }
+        return null;
+    }
+
+    public boolean canBePage(final String anything) {
+        return anything != null && PAGE_PATTERN.matcher(anything).matches();
+    }
+
+    public boolean canBeLang(final String anything) {
+        return anything != null && LANG_PATTERN.matcher(anything).matches();
+    }
+}