add /y/shell-exec in HTTP server

src/ShellCommands.hh

@@ -0,0 +1,38 @@
+#pragma once
+
+#include <deque>
+#include <memory>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include "ProxyServer.hh"
+#include "ServerState.hh"
+
+class exit_shell : public std::runtime_error {
+public:
+  exit_shell();
+  ~exit_shell() = default;
+};
+
+struct ShellCommand {
+  struct Args {
+    std::shared_ptr<ServerState> s;
+    std::string command;
+    std::string args;
+    std::string session_name;
+  };
+
+  const char* name;
+  const char* help_text;
+  bool run_on_event_thread;
+  std::deque<std::string> (*run)(Args&);
+
+  static std::vector<const ShellCommand*> commands_by_order;
+  static std::unordered_map<std::string, const ShellCommand*> commands_by_name;
+
+  ShellCommand(const char* name, const char* help_text, bool run_on_event_thread, std::deque<std::string> (*run)(Args&));
+
+  static std::deque<std::string> dispatch_str(std::shared_ptr<ServerState> s, const std::string& command);
+  static std::deque<std::string> dispatch(Args& args);
+};