Initial implementation, plus test programs.

include/jwp-plugin/AuthList.hpp

@@ -0,0 +1,16 @@
+#pragma once
+#include <forward_list>
+#include <string>
+
+class AuthList
+{
+public:
+    AuthList();
+
+    void add(const std::string& username);
+    void remove(const std::string& username);
+    bool confirm(const std::string& username);
+
+private:
+    std::forward_list<std::string> _allowedUsernames;
+};

include/jwp-plugin/Authorizer.hpp

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <string>
+#include <jwt-cpp/jwt.h>
+#include <jwp-plugin/AuthList.hpp>
+#include <optional>
+
+class Authorizer
+{
+public:
+    Authorizer(const std::string& pub_key, const std::string& issuer);
+    static std::optional<std::string> read_key(const std::string& key_file);
+    void add_unknown(const std::string& username);
+    bool is_unknown(const std::string& username);
+    bool add(const std::string& token, const std::string& username);
+    bool can_read(const std::string& username);
+    bool can_write(const std::string& username);
+    void logout(const std::string& username);
+private:
+    AuthList _writeList;
+    AuthList _readList;
+    AuthList _unknownList;
+
+    std::string _pub_key;
+    std::string _issuer;
+};