1 files changed, 51 insertions, 0 deletions
diff --git a/juick-spring-www/src/main/java/com/juick/www/HelpService.java b/juick-spring-www/src/main/java/com/juick/www/HelpService.java
new file mode 100644
index 00000000..a3bee60a
--- /dev/null
+++ b/juick-spring-www/src/main/java/com/juick/www/HelpService.java
@@ -0,0 +1,51 @@
+package com.juick.www;
+
+import org.springframework.cache.annotation.Cacheable;
+import org.springframework.core.io.ClassPathResource;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+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 (canPage(page) && canLang(lang)) {
+            try {
+                Path file = Paths.get(helpPath, lang, page);
+                String path =file.toString();
+                file = Paths.get(new ClassPathResource(path).getURI());
+
+                if (Files.isReadable(file))
+                    return new String(Files.readAllBytes(file));
+            } catch (IOException e) {
+            }
+        }
+
+        return null;
+    }
+
+    public boolean canPage(final String anything) {
+        return anything != null && PAGE_PATTERN.matcher(anything).matches();
+    }
+
+    public boolean canLang(final String anything) {
+        return anything != null && LANG_PATTERN.matcher(anything).matches();
+    }
+}