Add support for XEP-0100 jabber:iq:gateway

src/biboumi.h.cmake

@@ -1,6 +1,7 @@
 #cmakedefine USE_DATABASE
 #cmakedefine ICONV_SECOND_ARGUMENT_IS_CONST
 #cmakedefine LIBIDN_FOUND
+#cmakedefine CURL_FOUND
 #cmakedefine SYSTEMD_FOUND
 #cmakedefine POLLER ${POLLER}
 #cmakedefine BOTAN_FOUND

src/irc/irc_uri.cpp

@@ -0,0 +1,68 @@
+#include <irc/irc_uri.hpp>
+
+#include <utils/split.hpp>
+
+#include <cstdio>
+#include <cstring>
+
+
+IrcUri::IrcUri(const std::string &uri) {
+#ifdef CURL_FOUND
+  this->url = curl_url();
+  curl_url_set(this->url, CURLUPART_URL, uri.c_str(), CURLU_NON_SUPPORT_SCHEME | CURLU_NO_AUTHORITY);
+#endif
+  (void)uri;
+}
+
+IrcUri::~IrcUri(void) {
+#ifdef CURL_FOUND
+  curl_url_cleanup(this->url);
+#endif
+}
+
+const std::optional<std::string> IrcUri::get_server(void) const {
+#ifdef CURL_FOUND
+  char *server;
+  CURLUcode rc = curl_url_get(this->url, CURLUPART_HOST, &server, 0);
+  if (rc) {
+    return std::nullopt;
+  }
+  return server;
+#else
+  return std::nullopt;
+#endif // CURL_FOUND
+};
+
+const std::optional<std::string> IrcUri::get_entity(void) const {
+#ifdef CURL_FOUND
+  char *entity;
+  std::string output;
+  CURLUcode rc;
+  rc = curl_url_get(this->url, CURLUPART_PATH, &entity, CURLU_URLDECODE);
+  if (rc)
+    return std::nullopt;
+  output = entity;
+  if (!output.empty())
+    output.erase(0, 1);
+  if (output.empty()) {
+    rc = curl_url_get(this->url, CURLUPART_FRAGMENT, &entity, CURLU_URLDECODE);
+    if (rc)
+      return std::nullopt;
+    output = entity;
+    output.insert(0, 1, '#');
+  }
+  return IrcUri::parse_entity(output);
+#else
+  return std::nullopt;
+#endif // CURL_FOUND
+};
+
+const std::string IrcUri::parse_entity(const std::string entity) {
+  const std::vector<std::string> entity_name_and_type =
+      utils::split(entity, ',');
+
+  if (entity_name_and_type.size() > 0)
+    return entity_name_and_type.at(0);
+
+  return entity;
+}; 

src/irc/irc_uri.hpp

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <biboumi.h>
+
+#include <optional>
+#include <xmpp/jid.hpp>
+#include <string>
+#include <curl/urlapi.h>
+
+/**
+ * Parses and keeps information about one IRC URI
+ *
+ * https://datatracker.ietf.org/doc/html/draft-butcher-irc-url-04
+ *
+ * Requires CURL
+ */
+class IrcUri
+{
+public:
+  explicit IrcUri(const std::string &uri);
+  ~IrcUri(void);
+
+  IrcUri(const IrcUri&) = delete;
+  IrcUri(IrcUri&&) = delete;
+  IrcUri& operator=(const IrcUri&) = delete;
+  IrcUri& operator=(IrcUri&&) = delete;
+
+  const std::optional<std::string> get_server(void) const;
+  const std::optional<std::string> get_entity(void) const;
+
+private:
+#ifdef CURL_FOUND
+  CURLU *url;
+#endif
+
+  static const std::string parse_entity(const std::string entity);
+}; 

src/xmpp/biboumi_component.cpp

@@ -1,19 +1,23 @@
 #include <xmpp/biboumi_component.hpp>
 
+#include <utils/empty_if_fixed_server.hpp>
 #include <utils/timed_events.hpp>
 #include <utils/scopeguard.hpp>
 #include <utils/tolower.hpp>
 #include <logger/logger.hpp>
 #include <xmpp/adhoc_command.hpp>
 #include <xmpp/biboumi_adhoc_commands.hpp>
+#include <xmpp/xmpp_component.hpp>
 #include <bridge/list_element.hpp>
 #include <utils/encoding.hpp>
 #include <config/config.hpp>
 #include <utils/time.hpp>
 #include <xmpp/jid.hpp>
+#include <irc/irc_uri.hpp>
 
+#include <optional>
+#include <string>
 #include <stdexcept>
-#include <iostream>
 
 #include <cstdlib>
 
@@ -449,9 +453,10 @@ void BiboumiComponent::handle_iq(const Stanza& stanza)
   // the scopeguard.
   std::string error_type("cancel");
   std::string error_name("internal-server-error");
-  utils::ScopeGuard stanza_error([this, &from, &to_str, &id, &error_type, &error_name](){
+  std::string error_text("");
+  utils::ScopeGuard stanza_error([this, &from, &to_str, &id, &error_type, &error_name, &error_text](){
       this->send_stanza_error("iq", from, to_str, id,
-                              error_type, error_name, "");
+                              error_type, error_name, error_text);
     });
   try {
   if (type == "set")
@@ -518,6 +523,21 @@ void BiboumiComponent::handle_iq(const Stanza& stanza)
           this->send_stanza(response);
           stanza_error.disable();
         }
+#ifdef CURL_FOUND
+      else if ((query = stanza.get_child("query", GATEWAY_NS))) {
+          std::optional<Stanza> stanza =
+              this->handle_iq_gateway(query, &to, from, id);
+          if (stanza.has_value()) {
+            this->send_stanza(stanza.value());
+            stanza_error.disable();
+          } else {
+            error_name = "bad-request";
+            error_type = "modify";
+            error_text = "Invalid input. Check that the provided link is a valid irc URI";
+            return;
+          }
+      }
+#endif // CURL_FOUND
 #ifdef USE_DATABASE
       else if ((query = stanza.get_child("query", MAM_NS)))
         {
@@ -673,6 +693,28 @@ void BiboumiComponent::handle_iq(const Stanza& stanza)
             }
           stanza_error.disable();
         }
+#ifdef CURL_FOUND
+      else if ((query = stanza.get_child("query", GATEWAY_NS)))
+        {
+          Stanza iq("iq");
+          {
+            iq["from"] = to_str;
+            iq["to"] = from;
+            iq["id"] = id;
+            iq["type"] = "result";
+            XmlSubNode query(iq, GATEWAY_NS, "query");
+            {
+              query["xmlns"] = GATEWAY_NS;
+              XmlSubNode desc(query, "desc");
+              desc.set_inner("Enter an IRC URI. For example "
+                             "irc://irc.example.com/#channame");
+              XmlSubNode prompt(query, "prompt");
+              prompt.set_inner("IRC URI");
+            };
+          }
+          this->send_stanza(iq);
+        }
+#endif // CURL_FOUND
 #ifdef USE_DATABASE
       else if ((query = stanza.get_child("query", MUC_OWNER_NS)))
         {
@@ -736,6 +778,50 @@ void BiboumiComponent::handle_iq(const Stanza& stanza)
   error_name = "feature-not-implemented";
 }
 
+#ifdef CURL_FOUND
+std::optional<Stanza>
+BiboumiComponent::handle_iq_gateway(const Stanza *stanza, const Jid *from,
+                                    const std::string to,
+                                    const std::string id) {
+  const XmlNode *prompt = stanza->get_child("prompt", GATEWAY_NS);
+  const std::string inner = prompt->get_inner();
+
+  std::string local;
+  bool is_irc_uri =
+      (inner.starts_with("irc://") || inner.starts_with("ircs://"));
+  if (is_irc_uri) {
+    IrcUri irc_uri(inner);
+    const std::optional<std::string> entity = irc_uri.get_entity();
+    const std::optional<std::string> server = irc_uri.get_server();
+    const std::string irc_server = utils::empty_if_fixed_server("%" + server.value_or(""));
+    if (irc_server != "%")
+      local = entity.value_or("") + irc_server;
+  } else {
+    Iid i(inner, this->get_user_bridge(to));
+    const std::string iid_local = i.get_local();
+    if (!iid_local.empty())
+      local = iid_local + utils::empty_if_fixed_server("%" + i.get_server());
+  }
+  if (local.empty())
+    return std::nullopt;
+  Jid j(local + "@" + from->domain);
+  Stanza iq("iq");
+  {
+    iq["from"] = from->full();
+    iq["to"] = to;
+    iq["id"] = id;
+    iq["type"] = "result";
+    XmlSubNode query(iq, GATEWAY_NS, "query");
+    {
+      query["xmlns"] = GATEWAY_NS;
+      XmlSubNode jid(query, "jid");
+      jid.set_inner(j.full());
+    };
+  }
+  return iq;
+}
+#endif // CURL_FOUND
+
 #ifdef USE_DATABASE
 bool BiboumiComponent::handle_mam_request(const Stanza& stanza)
 {

src/xmpp/biboumi_component.hpp

@@ -90,6 +90,9 @@ public:
   void send_invitation(const std::string& room_target, const std::string& jid_to, const std::string& author_nick);
 private:
   void send_invitation_from_fulljid(const std::string& room_target, const std::string& jid_to, const std::string& from);
+#ifdef CURL_FOUND
+  std::optional<Stanza> handle_iq_gateway(const Stanza *stanza, const Jid *from, const std::string to, const std::string id);
+#endif
 public:
   void accept_subscription(const std::string& from, const std::string& to);
   void ask_subscription(const std::string& from, const std::string& to);

src/xmpp/xmpp_component.hpp

@@ -40,6 +40,7 @@
 #define STABLE_MUC_ID_NS "http://jabber.org/protocol/muc#stable_id"
 #define SELF_PING_FLAG   MUC_NS"#self-ping-optimization"
 #define MESSAGE_CORRECT_NS   "urn:xmpp:message-correct:0"
+#define GATEWAY_NS       "jabber:iq:gateway"
 
 /**
  * An XMPP component, communicating with an XMPP server using the protocole