1 files changed, 69 insertions, 0 deletions
diff --git a/src/main/java/com/juick/service/HelpService.java b/src/main/java/com/juick/service/HelpService.java
new file mode 100644
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--- /dev/null
+++ b/src/main/java/com/juick/service/HelpService.java
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+/*
+ * Copyright (C) 2008-2020, Juick
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.juick.service;
+
+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 + ".md");
+
+            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();
+    }
+
+    public String getHelpPath() {
+        return helpPath;
+    }
+}