// Matrix Construct // // Copyright (C) Matrix Construct Developers, Authors & Contributors // Copyright (C) 2016-2019 Jason Volk // // Permission to use, copy, modify, and/or distribute this software for any // purpose with or without fee is hereby granted, provided that the above // copyright notice and this permission notice is present in all copies. The // full license for this software is available in the LICENSE file. namespace ircd::m { struct report_error; static room _create_event(const createroom &); } struct ircd::m::report_error { static thread_local char buf[512]; template report_error(json::stack::array *const &errors, const string_view &room_id, const string_view &user_id, const string_view &fmt, args&&... a); }; decltype(ircd::m::createroom::version_default) ircd::m::createroom::version_default { { "name", "ircd.m.createroom.version_default" }, { "default", "5" }, }; decltype(ircd::m::createroom::spec_presets) ircd::m::createroom::spec_presets { "private_chat", "public_chat", "trusted_private_chat", }; ircd::m::room ircd::m::create(const createroom &c, json::stack::array *const &errors) try { const m::user::id &creator { at<"creator"_>(c) }; // Initial create event is committed here first; note that this means the // room is officially created and known to the system when this object // constructs. Since this overall process including the rest of this scope // is not naturally atomic, we shouldn't throw and abort after this point // otherwise the full multi-event creation will not be completed. After // this point we should report all errors to the errors array. const room room { _create_event(c) }; const m::room::id &room_id { room.room_id }; assert(room_id == json::get<"room_id"_>(c)); const json::string preset { json::get<"preset"_>(c) }; // creator join event // user rooms don't have their user joined to them at this time otherwise // they'll appear to clients. if(!preset || createroom::spec_preset(preset)) { const event::id::buf join_event_id { join(room, creator) }; } // initial power_levels // initial power levels aren't set on internal user rooms for now. if(!preset || createroom::spec_preset(preset)) try { thread_local char content_buf[8_KiB]; const json::object content { // If there is an override, use it json::get<"power_level_content_override"_>(c)? json::get<"power_level_content_override"_>(c): // Otherwise generate the default content which allows our closure // to add some items to the collections while it's buffering. m::room::power::compose_content(content_buf, [&c, &creator, &preset] (const string_view &key, json::stack::object &object) { if(key != "users") return; // Give the creator their power in the users collection json::stack::member { object, creator, json::value(room::power::default_creator_level) }; // For trusted_private_chat we need to promote everyone invited // to the same level in the users collection if(preset != "trusted_private_chat") return; for(const json::string &user_id : json::get<"invite"_>(c)) if(valid(id::USER, user_id)) json::stack::member { object, user_id, json::value(room::power::default_creator_level) }; }) }; send(room, creator, "m.room.power_levels", "", content); } catch(const std::exception &e) { report_error { errors, room_id, creator, "Failed to set power_levels: %s", e.what() }; } // initial join_rules const string_view &join_rule { preset == "private_chat"? "invite": preset == "trusted_private_chat"? "invite": preset == "public_chat"? "public": "invite" }; if(join_rule != "invite") try { send(room, creator, "m.room.join_rules", "", { { "join_rule", join_rule } }); } catch(const std::exception &e) { report_error { errors, room_id, creator, "Failed to set join_rules: %s", e.what() }; } // initial history_visibility const string_view &history_visibility { preset == "private_chat"? "shared": preset == "trusted_private_chat"? "shared": preset == "public_chat"? "shared": "shared" }; if(history_visibility != "shared") try { send(room, creator, "m.room.history_visibility", "", { { "history_visibility", history_visibility } }); } catch(const std::exception &e) { report_error { errors, room_id, creator, "Failed to set history_visibility: %s", e.what() }; } // initial guest_access const string_view &guest_access { preset == "private_chat"? "forbidden": preset == "trusted_private_chat"? "forbidden": preset == "public_chat"? "forbidden": "forbidden" }; if(guest_access == "can_join") try { send(room, creator, "m.room.guest_access", "", { { "guest_access", "can_join" } }); } catch(const std::exception &e) { report_error { errors, room_id, creator, "Failed to set guest_access: %s", e.what() }; } // user's initial state vector // // Takes precedence over events set by preset, but gets overriden by name // and topic keys. size_t i(0); for(const json::object &event : json::get<"initial_state"_>(c)) try { const json::string &type(event["type"]); const json::string &state_key(event["state_key"]); const json::object &content(event["content"]); send(room, creator, type, state_key, content); ++i; } catch(const std::exception &e) { report_error { errors, room_id, creator, "Failed to set initial_state event @%zu: %s", i++, e.what() }; } // override room name if(json::get<"name"_>(c)) try { static const size_t name_max_len { // 14.2.1.3: The name of the room. This MUST NOT exceed 255 bytes. 255 }; const auto name { trunc(json::get<"name"_>(c), name_max_len) }; send(room, creator, "m.room.name", "", { { "name", name } }); } catch(const std::exception &e) { report_error { errors, room_id, creator, "Failed to set room name: %s", e.what() }; } // override topic if(json::get<"topic"_>(c)) try { send(room, creator, "m.room.topic", "", { { "topic", json::get<"topic"_>(c) } }); } catch(const std::exception &e) { report_error { errors, room_id, creator, "Failed to set room topic: %s", e.what() }; } // invitation vector for(const json::string &_user_id : json::get<"invite"_>(c)) try { json::iov content; const json::iov::add is_direct // Conditionally add is_direct { content, json::get<"is_direct"_>(c), { "is_direct", []() -> json::value { return json::literal_true; } } }; const m::user::id &user_id{_user_id}; invite(room, user_id, creator, content); } catch(const m::error &e) { report_error { errors, room_id, creator, "Failed to invite user '%s' :%s :%s :%s", _user_id, e.what(), e.errcode(), e.errstr() }; // For DM's if we can't invite the counter-party there's no point in // creating the room, we can just abort instead. if(json::get<"is_direct"_>(c)) throw; } catch(const std::exception &e) { report_error { errors, room_id, creator, "Failed to invite user '%s' :%s", _user_id, e.what() }; } // override guest_access if(json::get<"guest_can_join"_>(c) && guest_access != "can_join") try { send(room, creator, "m.room.guest_access", "", { { "guest_access", "can_join" } }); } catch(const std::exception &e) { report_error { errors, room_id, creator, "Failed to set guest_access: %s", e.what() }; } // room directory if(json::get<"visibility"_>(c) == "public") try { // This call sends a message to the !public room to list this room in the // public rooms list. We set an empty summary for this room because we // already have its state on this server; m::rooms::summary::set(room.room_id); } catch(const std::exception &e) { report_error { errors, room_id, creator, "Failed to set public visibility: %s", e.what() }; } return room; } catch(const db::not_found &e) { throw m::error { http::CONFLICT, "M_ROOM_IN_USE", "The desired room name is in use." }; throw m::error { http::CONFLICT, "M_ROOM_ALIAS_IN_USE", "An alias of the desired room is in use." }; //XXX: clearly a conflict } bool ircd::m::createroom::spec_preset(const string_view &preset) { const auto &s(spec_presets); return std::find(begin(s), end(s), preset) != end(s); } // // internal // ircd::m::room ircd::m::_create_event(const createroom &c) { const m::user::id &creator { at<"creator"_>(c) }; const auto &type { json::get<"preset"_>(c) }; const auto &parent { json::get<"parent_room_id"_>(c) }; const json::object &user_content { json::get<"creation_content"_>(c) }; const size_t user_content_count { std::min(size(user_content), 16UL) // cap the number of keys }; const room room { at<"room_id"_>(c) }; json::iov event; json::iov content; json::iov::push _user_content[user_content_count]; make_iov(content, _user_content, user_content_count, user_content); const json::iov::push push[] { { event, { "auth_events", "[]" }}, { event, { "depth", 0L }}, { event, { "prev_events", "[]" }}, { event, { "room_id", room.room_id }}, { event, { "sender", creator }}, { event, { "state_key", "" }}, { event, { "type", "m.room.create" }}, { content, { "creator", creator }}, }; const json::iov::add _type { content, !type.empty() && type != "room", { "type", [&type]() -> json::value { return type; } } }; const string_view &room_version { json::get<"room_version"_>(c)? string_view{json::get<"room_version"_>(c)}: string_view{m::createroom::version_default} }; const json::iov::push _room_version { content, { "room_version", json::value { room_version, json::STRING } } }; m::vm::copts opts; opts.room_version = room_version; opts.phase.reset(vm::phase::VERIFY); m::vm::eval { event, content, opts }; return room; } // // report_error // decltype(ircd::m::report_error::buf) thread_local ircd::m::report_error::buf; template ircd::m::report_error::report_error(json::stack::array *const &errors, const string_view &room_id, const string_view &user_id, const string_view &fmt, args&&... a) { const string_view msg{fmt::sprintf { buf, fmt, std::forward(a)... }}; log::derror { m::log, "Error when creating room %s for user %s :%s", room_id, user_id, msg }; if(errors) errors->append(msg); }