Add Visione backend foundation

common/Validation.cc

@@ -0,0 +1,45 @@
+#include "common/Validation.h"
+
+#include <regex>
+
+namespace visione::validation
+{
+bool hasString(const Json::Value &body, const std::string &key)
+{
+    return body.isMember(key) && body[key].isString() &&
+           !body[key].asString().empty();
+}
+
+bool hasNumber(const Json::Value &body, const std::string &key)
+{
+    return body.isMember(key) && body[key].isNumeric();
+}
+
+std::vector<std::string> missingStrings(
+    const Json::Value &body,
+    std::initializer_list<const char *> keys)
+{
+    std::vector<std::string> missing;
+    for (const auto *key : keys)
+    {
+        if (!hasString(body, key))
+        {
+            missing.emplace_back(key);
+        }
+    }
+    return missing;
+}
+
+bool isValidEmail(const std::string &email)
+{
+    static const std::regex pattern(R"(^[^@\s]+@[^@\s]+\.[^@\s]+$)");
+    return std::regex_match(email, pattern);
+}
+
+bool isValidFiscalCode(const std::string &fiscalCode)
+{
+    static const std::regex pattern(R"(^[A-Za-z0-9]{16}$)");
+    return std::regex_match(fiscalCode, pattern);
+}
+}  // namespace visione::validation
+