feat: Integrate CIE authentication flow

common/Http.cc

@@ -1,5 +1,9 @@
 #include "common/Http.h"
 
+#include <drogon/HttpRequest.h>
+
+#include <sstream>
+
 namespace visione::http
 {
 drogon::HttpResponsePtr json(Json::Value body, drogon::HttpStatusCode status)
@@ -22,6 +26,14 @@ drogon::HttpResponsePtr error(const std::string &code,
     return json(std::move(body), status);
 }
 
+drogon::HttpResponsePtr redirect(const std::string &url,
+                                 drogon::HttpStatusCode status)
+{
+    auto response = drogon::HttpResponse::newRedirectionResponse(url);
+    response->setStatusCode(status);
+    return response;
+}
+
 Json::Value requireJson(const drogon::HttpRequestPtr &request)
 {
     const auto &body = request->getJsonObject();
@@ -31,5 +43,23 @@ Json::Value requireJson(const drogon::HttpRequestPtr &request)
     }
     return *body;
 }
-}  // namespace visione::http
 
+Json::Value parseJsonBody(const std::string &body)
+{
+    if (body.empty())
+    {
+        return Json::Value(Json::nullValue);
+    }
+
+    Json::CharReaderBuilder builder;
+    builder["collectComments"] = false;
+    std::string errors;
+    Json::Value parsed;
+    std::istringstream stream(body);
+    if (!Json::parseFromStream(builder, stream, &parsed, &errors))
+    {
+        return Json::Value(Json::nullValue);
+    }
+    return parsed;
+}
+}  // namespace visione::http