Added UUID random generation

src/libs/utils/impl/UUID.cpp

@@ -19,8 +19,12 @@
 
 #include "utils/UUID.hpp"
 
+#include <cassert>
+#include <iomanip>
 #include <regex>
+#include <sstream>
 
+#include "utils/Random.hpp"
 #include "utils/String.hpp"
 
 namespace StringUtils
@@ -32,23 +36,22 @@ namespace StringUtils
         return UUID::fromString(str);
     }
 }
-
-static
-bool
-stringIsUUID(std::string_view str)
+namespace
+{
+    bool stringIsUUID(std::string_view str)
     {
         static const std::regex re{ R"([0-9a-fA-F]{8}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{12})" };
 
         return std::regex_match(std::cbegin(str), std::cend(str), re);
     }
+}
 
 UUID::UUID(std::string_view str)
     : _value{ StringUtils::stringToLower(str) }
 {
 }
 
-std::optional<UUID>
-UUID::fromString(std::string_view str)
+std::optional<UUID> UUID::fromString(std::string_view str)
 {
     if (!stringIsUUID(str))
         return std::nullopt;
@@ -56,3 +59,31 @@ UUID::fromString(std::string_view str)
     return UUID{ str };
 }
 
+UUID UUID::generate()
+{
+    // Form is "123e4567-e89b-12d3-a456-426614174000"
+    // TODO: store 128 bits and only convert to string when necessary
+
+    std::ostringstream oss;
+
+    auto concatRandomBytes{ [](std::ostream& os, std::size_t byteCount)
+    {
+        for (std::size_t i {}; i < byteCount; ++i)
+            os << std::hex << std::setfill('0') << std::setw(2) << static_cast<int>(Random::getRandom<std::uint8_t>(0, 255));
+    } };
+
+    concatRandomBytes(oss, 4);
+    oss << "-";
+    concatRandomBytes(oss, 2);
+    oss << "-";
+    concatRandomBytes(oss, 2);
+    oss << "-";
+    concatRandomBytes(oss, 2);
+    oss << "-";
+    concatRandomBytes(oss, 6);
+
+    const auto uuid{fromString(oss.str())};
+    assert(uuid);
+    return uuid.value();
+}
+

src/libs/utils/include/utils/UUID.hpp

@@ -29,6 +29,7 @@ class UUID
 {
 public:
     static std::optional<UUID> fromString(std::string_view str);
+    static UUID generate();
 
     std::string_view getAsString() const { return _value; }