Add an ad-hoc command to disconnect some users

src/xmpp/adhoc_command.cpp

 #include <xmpp/adhoc_command.hpp>
+#include <xmpp/xmpp_component.hpp>
+
+#include <bridge/bridge.hpp>
 
 using namespace std::string_literals;
 
@@ -13,7 +16,12 @@ AdhocCommand::~AdhocCommand()
 {
 }
 
-void PingStep1(AdhocSession&, XmlNode& command_node)
+bool AdhocCommand::is_admin_only() const
+{
+  return this->admin_only;
+}
+
+void PingStep1(XmppComponent* xmpp_component, AdhocSession&, XmlNode& command_node)
 {
   XmlNode note("note");
   note["type"] = "info";
@@ -22,7 +30,7 @@ void PingStep1(AdhocSession&, XmlNode& command_node)
   command_node.add_child(std::move(note));
 }
 
-void HelloStep1(AdhocSession&, XmlNode& command_node)
+void HelloStep1(XmppComponent* xmpp_component, AdhocSession&, XmlNode& command_node)
 {
   XmlNode x("jabber:x:data:x");
   x["type"] = "form";
@@ -47,7 +55,7 @@ void HelloStep1(AdhocSession&, XmlNode& command_node)
   command_node.add_child(std::move(x));
 }
 
-void HelloStep2(AdhocSession& session, XmlNode& command_node)
+void HelloStep2(XmppComponent* xmpp_component, AdhocSession& session, XmlNode& command_node)
 {
   // Find out if the name was provided in the form.
   XmlNode* x = command_node.get_child("x", "jabber:x:data");
@@ -80,3 +88,101 @@ void HelloStep2(AdhocSession& session, XmlNode& command_node)
   // anyway. But this is for the example.
   session.terminate();
 }
+
+void DisconnectUserStep1(XmppComponent* xmpp_component, AdhocSession& session, XmlNode& command_node)
+{
+  XmlNode x("jabber:x:data:x");
+  x["type"] = "form";
+  XmlNode title("title");
+  title.set_inner("Disconnect a user from the gateway");
+  title.close();
+  x.add_child(std::move(title));
+  XmlNode instructions("instructions");
+  instructions.set_inner("Choose a user JID and a quit message");
+  instructions.close();
+  x.add_child(std::move(instructions));
+  XmlNode jids_field("field");
+  jids_field["var"] = "jids";
+  jids_field["type"] = "list-multi";
+  jids_field["label"] = "The JIDs to disconnect";
+  XmlNode required("required");
+  required.close();
+  jids_field.add_child(std::move(required));
+  for (Bridge* bridge: xmpp_component->get_bridges())
+    {
+      XmlNode option("option");
+      option["label"] = bridge->get_jid();
+      XmlNode value("value");
+      value.set_inner(bridge->get_jid());
+      value.close();
+      option.add_child(std::move(value));
+      option.close();
+      jids_field.add_child(std::move(option));
+    }
+  jids_field.close();
+  x.add_child(std::move(jids_field));
+
+  XmlNode message_field("field");
+  message_field["var"] = "quit-message";
+  message_field["type"] = "text-single";
+  message_field["label"] = "Quit message";
+  XmlNode message_value("value");
+  message_value.set_inner("Disconnected by admin");
+  message_value.close();
+  message_field.add_child(std::move(message_value));
+  message_field.close();
+  x.add_child(std::move(message_field));
+  x.close();
+  command_node.add_child(std::move(x));
+}
+
+void DisconnectUserStep2(XmppComponent* xmpp_component, AdhocSession& session, XmlNode& command_node)
+{
+  // Find out if the jids, and the quit message are provided in the form.
+  std::string quit_message;
+  XmlNode* x = command_node.get_child("x", "jabber:x:data");
+  if (x)
+    {
+      XmlNode* message_field = nullptr;
+      XmlNode* jids_field = nullptr;
+      for (XmlNode* field: x->get_children("field", "jabber:x:data"))
+        if (field->get_tag("var") == "jids")
+          jids_field = field;
+        else if (field->get_tag("var") == "quit-message")
+          message_field = field;
+      if (message_field)
+        {
+          XmlNode* value = message_field->get_child("value", "jabber:x:data");
+          if (value)
+            quit_message = value->get_inner();
+        }
+      if (jids_field)
+        {
+          std::size_t num = 0;
+          for (XmlNode* value: jids_field->get_children("value", "jabber:x:data"))
+            {
+              Bridge* bridge = xmpp_component->find_user_bridge(value->get_inner());
+              if (bridge)
+                {
+                  bridge->shutdown(quit_message);
+                  num++;
+                }
+            }
+          command_node.delete_all_children();
+
+          XmlNode note("note");
+          note["type"] = "info";
+          if (num == 0)
+            note.set_inner("No user were disconnected.");
+          else if (num == 1)
+            note.set_inner("1 user has been disconnected.");
+          else
+            note.set_inner(std::to_string(num) + " users have been disconnected.");
+          note.close();
+          command_node.add_child(std::move(note));
+        }
+    }
+  // TODO insert an error telling the values are missing.
+  session.terminate();
+}
+

src/xmpp/adhoc_command.hpp

@@ -23,6 +23,8 @@ public:
 
   const std::string name;
 
+  bool is_admin_only() const;
+
 private:
   /**
    * A command may have one or more steps. Each step is a different
@@ -33,8 +35,10 @@ private:
   const bool admin_only;
 };
 
-void PingStep1(AdhocSession& session, XmlNode& command_node);
-void HelloStep1(AdhocSession& session, XmlNode& command_node);
-void HelloStep2(AdhocSession& session, XmlNode& command_node);
+void PingStep1(XmppComponent*, AdhocSession& session, XmlNode& command_node);
+void HelloStep1(XmppComponent*, AdhocSession& session, XmlNode& command_node);
+void HelloStep2(XmppComponent*, AdhocSession& session, XmlNode& command_node);
+void DisconnectUserStep1(XmppComponent*, AdhocSession& session, XmlNode& command_node);
+void DisconnectUserStep2(XmppComponent*, AdhocSession& session, XmlNode& command_node);
 
 #endif // ADHOC_COMMAND_HPP

src/xmpp/adhoc_commands_handler.cpp

@@ -2,13 +2,17 @@
 #include <xmpp/xmpp_component.hpp>
 
 #include <logger/logger.hpp>
+#include <config/config.hpp>
+#include <xmpp/jid.hpp>
 
 #include <iostream>
 
-AdhocCommandsHandler::AdhocCommandsHandler():
+AdhocCommandsHandler::AdhocCommandsHandler(XmppComponent* xmpp_component):
+  xmpp_component(xmpp_component),
   commands{
   {"ping", AdhocCommand({&PingStep1}, "Do a ping", false)},
-  {"hello", AdhocCommand({&HelloStep1, &HelloStep2}, "Receive a custom greeting", false)}
+  {"hello", AdhocCommand({&HelloStep1, &HelloStep2}, "Receive a custom greeting", false)},
+  {"disconnect-user", AdhocCommand({&DisconnectUserStep1, &DisconnectUserStep2}, "Disconnect a user from the gateway", true)}
   }
 {
 }
@@ -31,6 +35,8 @@ XmlNode&& AdhocCommandsHandler::handle_request(const std::string& executor_jid,
     action = "execute";
   command_node.del_tag("action");
 
+  Jid jid(executor_jid);
+
   const std::string node = command_node.get_tag("node");
   auto command_it = this->commands.find(node);
   if (command_it == this->commands.end())
@@ -43,6 +49,17 @@ XmlNode&& AdhocCommandsHandler::handle_request(const std::string& executor_jid,
       error.close();
       command_node.add_child(std::move(error));
     }
+  else if (command_it->second.is_admin_only() &&
+           Config::get("admin", "") != jid.local + "@" + jid.domain)
+    {
+      XmlNode error(ADHOC_NS":error");
+      error["type"] = "cancel";
+      XmlNode condition(STANZA_NS":forbidden");
+      condition.close();
+      error.add_child(std::move(condition));
+      error.close();
+      command_node.add_child(std::move(error));
+    }
   else
     {
       std::string sessionid = command_node.get_tag("sessionid");
@@ -74,7 +91,7 @@ XmlNode&& AdhocCommandsHandler::handle_request(const std::string& executor_jid,
           // execute the step
           AdhocSession& session = session_it->second;
           const AdhocStep& step = session.get_next_step();
-          step(session, command_node);
+          step(this->xmpp_component, session, command_node);
           if (session.remaining_steps() == 0 ||
               session.is_terminated())
             {

src/xmpp/adhoc_commands_handler.hpp

@@ -13,10 +13,12 @@
 #include <string>
 #include <map>
 
+class XmppComponent;
+
 class AdhocCommandsHandler
 {
 public:
-  explicit AdhocCommandsHandler();
+  explicit AdhocCommandsHandler(XmppComponent* xmpp_component);
   ~AdhocCommandsHandler();
   /**
    * Returns the list of available commands.
@@ -36,6 +38,11 @@ public:
    */
   XmlNode&& handle_request(const std::string& executor_jid, XmlNode command_node);
 private:
+  /**
+   * A pointer to the XmppComponent, to access to basically anything in the
+   * gateway.
+   */
+  XmppComponent* xmpp_component;
   /**
    * The list of all available commands.
    */

src/xmpp/adhoc_session.hpp

@@ -6,6 +6,8 @@
 #include <functional>
 #include <string>
 
+class XmppComponent;
+
 class AdhocCommand;
 class AdhocSession;
 
@@ -16,7 +18,7 @@ class AdhocSession;
  * TODO fix this:
  * It also must call one of step_passed(), cancel() etc on the AdhocSession object.
  */
-typedef std::function<void(AdhocSession&, XmlNode&)> AdhocStep;
+typedef std::function<void(XmppComponent*, AdhocSession&, XmlNode&)> AdhocStep;
 
 class AdhocSession
 {

src/xmpp/xmpp_component.cpp

@@ -41,7 +41,8 @@ XmppComponent::XmppComponent(std::shared_ptr<Poller> poller, const std::string&
   served_hostname(hostname),
   secret(secret),
   authenticated(false),
-  doc_open(false)
+  doc_open(false),
+  adhoc_commands_handler(this)
 {
   this->parser.add_stream_open_callback(std::bind(&XmppComponent::on_remote_stream_open, this,
                                                   std::placeholders::_1));
@@ -543,6 +544,26 @@ Bridge* XmppComponent::get_user_bridge(const std::string& user_jid)
     }
 }
 
+Bridge* XmppComponent::find_user_bridge(const std::string& user_jid)
+{
+  try
+    {
+      return this->bridges.at(user_jid).get();
+    }
+  catch (const std::out_of_range& exception)
+    {
+      return nullptr;
+    }
+}
+
+std::list<Bridge*> XmppComponent::get_bridges() const
+{
+  std::list<Bridge*> res;
+  for (auto it = this->bridges.begin(); it != this->bridges.end(); ++it)
+    res.push_back(it->second.get());
+  return res;
+}
+
 void* XmppComponent::get_receive_buffer(const size_t size) const
 {
   return this->parser.get_buffer(size);

src/xmpp/xmpp_component.hpp

@@ -41,6 +41,16 @@ public:
   void on_connection_close() override final;
   void parse_in_buffer(const size_t size) override final;
 
+  /**
+   * Returns the bridge for the given user. If it does not exist, return
+   * nullptr.
+   */
+  Bridge* find_user_bridge(const std::string& user_jid);
+  /**
+   * Return a list of all the managed bridges.
+   */
+  std::list<Bridge*> get_bridges() const;
+
   /**
    * Returns a unique id, to be used in the 'id' element of our iq stanzas.
    */
@@ -228,6 +238,7 @@ private:
   bool doc_open;
 
   std::unordered_map<std::string, std::function<void(const Stanza&)>> stanza_handlers;
+  AdhocCommandsHandler adhoc_commands_handler;
 
   /**
    * One bridge for each user of the component. Indexed by the user's full
@@ -235,7 +246,6 @@ private:
    */
   std::unordered_map<std::string, std::unique_ptr<Bridge>> bridges;
 
-  AdhocCommandsHandler adhoc_commands_handler;
   XmppComponent(const XmppComponent&) = delete;
   XmppComponent(XmppComponent&&) = delete;
   XmppComponent& operator=(const XmppComponent&) = delete;