Add htmlTranslate() method

examples/simple_example/api_v1_ApiTest.cc

@@ -34,6 +34,7 @@ void ApiTest::your_method_name(const HttpRequestPtr &req, const std::function<vo
     std::map<std::string, std::string> para;
     para["p1"] = std::to_string(p1);
     para["p2"] = std::to_string(p2);
+    para["p3"] = HttpViewData::htmlTranslate("<script>alert(\" This should not be displayed in a browser alert box.\");</script>");
     data.insert("parameters", para);
     auto res = HttpResponse::newHttpViewResponse("ListParaView", data);
     callback(res);

lib/inc/drogon/HttpViewData.h

@@ -119,6 +119,15 @@ class HttpViewData
         return _viewData[key];
     }
 
+    /// Translate some special characters to HTML format, such as:
+    /**
+     * " --> "
+     * & --> &
+     * < --> &lt;
+     * > --> &gt;
+     */
+    static std::string htmlTranslate(const std::string &str);
+
   protected:
     typedef std::unordered_map<std::string, any> ViewDataMap;
     mutable ViewDataMap _viewData;

lib/src/HttpViewData.cc

@@ -0,0 +1,45 @@
+/**
+ *
+ *  HttpViewData.cc
+ *  An Tao
+ *
+ *  Copyright 2018, An Tao.  All rights reserved.
+ *  https://github.com/an-tao/drogon
+ *  Use of this source code is governed by a MIT license
+ *  that can be found in the License file.
+ *
+ *  Drogon
+ *
+ */
+
+#include <drogon/HttpViewData.h>
+
+using namespace drogon;
+
+std::string HttpViewData::htmlTranslate(const std::string &str)
+{
+    std::string ret;
+    ret.reserve(str.length());
+    for (auto &ch : str)
+    {
+        switch (ch)
+        {
+        case '"':
+            ret.append("&quot;");
+            break;
+        case '<':
+            ret.append("&lt;");
+            break;
+        case '>':
+            ret.append("&gt;");
+            break;
+        case '&':
+            ret.append("&amp;");
+            break;
+        default:
+            ret.push_back(ch);
+            break;
+        }
+    }
+    return ret;
+}