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server.cpp
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server.cpp
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/*
Copyright (C) 2003 - 2018 by David White <dave@whitevine.net>
Copyright (C) 2015 - 2020 by Iris Morelle <shadowm2006@gmail.com>
Part of the Battle for Wesnoth Project https://www.wesnoth.org/
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY.
See the COPYING file for more details.
*/
/**
* @file
* Wesnoth addon server.
* Expects a "server.cfg" config file in the current directory
* and saves addons under data/.
*/
#include "server/campaignd/server.hpp"
#include "filesystem.hpp"
#include "lexical_cast.hpp"
#include "log.hpp"
#include "serialization/base64.hpp"
#include "serialization/binary_or_text.hpp"
#include "serialization/parser.hpp"
#include "serialization/string_utils.hpp"
#include "serialization/unicode.hpp"
#include "game_config.hpp"
#include "addon/validation.hpp"
#include "server/campaignd/addon_utils.hpp"
#include "server/campaignd/auth.hpp"
#include "server/campaignd/blacklist.hpp"
#include "server/campaignd/control.hpp"
#include "server/campaignd/fs_commit.hpp"
#include "server/campaignd/options.hpp"
#include "game_version.hpp"
#include "hash.hpp"
#include "utils/optimer.hpp"
#include <csignal>
#include <ctime>
#include <iomanip>
// the fork execute is unix specific only tested on Linux quite sure it won't
// work on Windows not sure which other platforms have a problem with it.
#if !(defined(_WIN32))
#include <errno.h>
#endif
static lg::log_domain log_campaignd("campaignd");
#define DBG_CS LOG_STREAM(debug, log_campaignd)
#define LOG_CS LOG_STREAM(info, log_campaignd)
#define WRN_CS LOG_STREAM(warn, log_campaignd)
#define ERR_CS LOG_STREAM(err, log_campaignd)
static lg::log_domain log_config("config");
#define ERR_CONFIG LOG_STREAM(err, log_config)
#define WRN_CONFIG LOG_STREAM(warn, log_config)
static lg::log_domain log_server("server");
#define ERR_SERVER LOG_STREAM(err, log_server)
namespace campaignd {
namespace {
/**
* campaignd capabilities supported by this version of the server.
*
* These are advertised to clients using the @a [server_id] command. They may
* be disabled or re-enabled at runtime.
*/
const std::set<std::string> cap_defaults = {
// Legacy item and passphrase-based authentication
"auth:legacy",
// Delta WML packs
"delta",
};
/**
* Default URL to the add-ons server web index.
*/
const std::string default_web_url = "https://add-ons.wesnoth.org/";
/**
* Default license terms for content uploaded to the server.
*
* This used by both the @a [server_id] command and @a [request_terms] in
* their responses.
*
* The text is intended for display on the client with Pango markup enabled and
* sent by the server as-is, so it ought to be formatted accordingly.
*/
const std::string default_license_notice = R"""(<span size='x-large'>General Rules</span>
The current version of the server rules can be found at: https://r.wesnoth.org/t51347
<span color='#f88'>Any content that does not conform to the rules listed at the link above, as well as the licensing terms below, may be removed at any time without prior notice.</span>
<span size='x-large'>Licensing</span>
All content within add-ons uploaded to this server must be licensed under the terms of the GNU General Public License (GPL), version 2 or later, with the sole exception of graphics and audio explicitly denoted as released under a Creative Commons license either in:
a) a combined toplevel file, e.g. “<span font_family='monospace'>My_Addon/ART_LICENSE</span>”; <b>or</b>
b) a file with the same path as the asset with “<span font_family='monospace'>.license</span>” appended, e.g. “<span font_family='monospace'>My_Addon/images/units/axeman.png.license</span>”.
<b>By uploading content to this server, you certify that you have the right to:</b>
a) release all included art and audio explicitly denoted with a Creative Commons license in the prescribed manner under that license; <b>and</b>
b) release all other included content under the terms of the chosen versions of the GNU GPL.)""";
bool timing_reports_enabled = false;
void timing_report_function(const util::ms_optimer& tim, const campaignd::server::request& req, const std::string& label = {})
{
if(timing_reports_enabled) {
if(label.empty()) {
LOG_CS << req << "Time elapsed: " << tim << " ms\n";
} else {
LOG_CS << req << "Time elapsed [" << label << "]: " << tim << " ms\n";
}
}
}
inline util::ms_optimer service_timer(const campaignd::server::request& req, const std::string& label = {})
{
return util::ms_optimer{std::bind(timing_report_function, std::placeholders::_1, req, label)};
}
//
// Auxiliary shortcut functions
//
/**
* WML version of campaignd::auth::verify_passphrase().
*
* The salt and hash are retrieved from the @a passsalt and @a passhash
* attributes, respectively.
*/
inline bool authenticate(config& addon, const config::attribute_value& passphrase)
{
return auth::verify_passphrase(passphrase, addon["passsalt"], addon["passhash"]);
}
/**
* WML version of campaignd::auth::generate_hash().
*
* The salt and hash are written into the @a passsalt and @a passhash
* attributes, respectively.
*/
inline void set_passphrase(config& addon, const std::string& passphrase)
{
std::tie(addon["passsalt"], addon["passhash"]) = auth::generate_hash(passphrase);
}
/**
* Returns the update pack filename for the specified old/new version pair.
*
* The filename is in the form @p "update_pack_<VERSION_MD5>.gz".
*/
inline std::string make_update_pack_filename(const std::string& old_version, const std::string& new_version)
{
return "update_pack_" + utils::md5(old_version + new_version).hex_digest() + ".gz";
}
/**
* Returns the full pack filename for the specified version.
*
* The filename is in the form @p "full_pack_<VERSION_MD5>.gz".
*/
inline std::string make_full_pack_filename(const std::string& version)
{
return "full_pack_" + utils::md5(version).hex_digest() + ".gz";
}
/**
* Returns the index filename for the specified version.
*
* The filename is in the form @p "full_pack_<VERSION_MD5>.hash.gz".
*/
inline std::string make_index_filename(const std::string& version)
{
return "full_pack_" + utils::md5(version).hex_digest() + ".hash.gz";
}
/**
* Returns the index counterpart for the specified full pack file.
*
* The result is in the same form as make_index_filename().
*/
inline std::string index_from_full_pack_filename(std::string pack_fn)
{
auto dot_pos = pack_fn.find_last_of('.');
if(dot_pos != std::string::npos) {
pack_fn.replace(dot_pos, std::string::npos, ".hash.gz");
}
return pack_fn;
}
/**
* Returns @a false if @a cfg is null or empty.
*/
bool have_wml(const utils::optional_reference<const config>& cfg)
{
return cfg && !cfg->empty();
}
/**
* Scans multiple WML pack-like trees for illegal names.
*
* Null WML objects are skipped.
*/
template<typename... Vals>
std::optional<std::vector<std::string>> multi_find_illegal_names(const Vals&... args)
{
std::vector<std::string> names;
((args && check_names_legal(*args, &names)), ...);
return !names.empty() ? std::optional(names) : std::nullopt;
}
/**
* Scans multiple WML pack-like trees for case conflicts.
*
* Null WML objects are skipped.
*/
template<typename... Vals>
std::optional<std::vector<std::string>> multi_find_case_conflicts(const Vals&... args)
{
std::vector<std::string> names;
((args && check_case_insensitive_duplicates(*args, &names)), ...);
return !names.empty() ? std::optional(names) : std::nullopt;
}
/**
* Escapes double quotes intended to be passed into simple_wml.
*
* Just why does simple_wml have to be so broken to force us to use this, though?
*/
std::string simple_wml_escape(const std::string& text)
{
std::string res;
auto it = text.begin();
while(it != text.end()) {
res.append(*it == '"' ? 2 : 1, *it);
++it;
}
return res;
}
} // end anonymous namespace
server::server(const std::string& cfg_file, unsigned short port)
: server_base(default_campaignd_port, true)
, capabilities_(cap_defaults)
, addons_()
, dirty_addons_()
, cfg_()
, cfg_file_(cfg_file)
, read_only_(false)
, compress_level_(0)
, update_pack_lifespan_(0)
, strict_versions_(true)
, hooks_()
, handlers_()
, feedback_url_format_()
, web_url_()
, license_notice_()
, blacklist_()
, blacklist_file_()
, stats_exempt_ips_()
, flush_timer_(io_service_)
{
#ifndef _WIN32
struct sigaction sa;
std::memset( &sa, 0, sizeof(sa) );
#pragma GCC diagnostic ignored "-Wold-style-cast"
sa.sa_handler = SIG_IGN;
int res = sigaction( SIGPIPE, &sa, nullptr);
assert( res == 0 );
#endif
load_config();
// Command line config override. This won't get saved back to disk since we
// leave the WML intentionally untouched.
if(port != 0) {
port_ = port;
}
LOG_CS << "Port: " << port_ << '\n';
LOG_CS << "Server directory: " << game_config::path << " (" << addons_.size() << " add-ons)\n";
register_handlers();
start_server();
flush_cfg();
}
server::~server()
{
write_config();
}
void server::load_config()
{
LOG_CS << "Reading configuration from " << cfg_file_ << "...\n";
filesystem::scoped_istream in = filesystem::istream_file(cfg_file_);
read(cfg_, *in);
read_only_ = cfg_["read_only"].to_bool(false);
if(read_only_) {
LOG_CS << "READ-ONLY MODE ACTIVE\n";
}
strict_versions_ = cfg_["strict_versions"].to_bool(true);
// Seems like compression level above 6 is a waste of CPU cycles.
compress_level_ = cfg_["compress_level"].to_int(6);
// One month probably will be fine (#TODO: testing needed)
update_pack_lifespan_ = cfg_["update_pack_lifespan"].to_time_t(30 * 24 * 60 * 60);
if(const auto& svinfo_cfg = server_info()) {
feedback_url_format_ = svinfo_cfg["feedback_url_format"].str();
web_url_ = svinfo_cfg["web_url"].str(default_web_url);
license_notice_ = svinfo_cfg["license_notice"].str(default_license_notice);
}
blacklist_file_ = cfg_["blacklist_file"].str();
load_blacklist();
stats_exempt_ips_ = utils::split(cfg_["stats_exempt_ips"].str());
// Load any configured hooks.
hooks_.emplace(std::string("hook_post_upload"), cfg_["hook_post_upload"]);
hooks_.emplace(std::string("hook_post_erase"), cfg_["hook_post_erase"]);
#ifndef _WIN32
// Open the control socket if enabled.
if(!cfg_["control_socket"].empty()) {
const std::string& path = cfg_["control_socket"].str();
if(path != fifo_path_) {
const int res = mkfifo(path.c_str(),0660);
if(res != 0 && errno != EEXIST) {
ERR_CS << "could not make fifo at '" << path << "' (" << strerror(errno) << ")\n";
} else {
input_.close();
int fifo = open(path.c_str(), O_RDWR|O_NONBLOCK);
input_.assign(fifo);
LOG_CS << "opened fifo at '" << path << "'. Server commands may be written to this file.\n";
read_from_fifo();
fifo_path_ = path;
}
}
}
#endif
// Certain config values are saved to WML again so that a given server
// instance's parameters remain constant even if the code defaults change
// at some later point.
cfg_["compress_level"] = compress_level_;
// But not the listening port number.
port_ = cfg_["port"].to_int(default_campaignd_port);
// Limit the max size of WML documents received from the net to prevent the
// possible excessive use of resources due to malformed packets received.
// Since an addon is sent in a single WML document this essentially limits
// the maximum size of an addon that can be uploaded.
simple_wml::document::document_size_limit = cfg_["document_size_limit"].to_int(default_document_size_limit);
//Loading addons
addons_.clear();
std::vector<std::string> legacy_addons, dirs;
filesystem::get_files_in_dir("data", &legacy_addons, &dirs);
config meta;
for(const std::string& addon_dir : dirs) {
in = filesystem::istream_file(filesystem::normalize_path("data/" + addon_dir + "/addon.cfg"));
read(meta, *in);
if(!meta.empty()) {
addons_.emplace(meta["name"].str(), meta);
} else {
throw filesystem::io_exception("Failed to load addon from dir '" + addon_dir + "'\n");
}
}
// Convert all legacy addons to the new format on load
if(cfg_.has_child("campaigns")) {
config& campaigns = cfg_.child("campaigns");
WRN_CS << "Old format addons have been detected in the config! They will be converted to the new file format! "
<< campaigns.child_count("campaign") << " entries to be processed.\n";
for(config& campaign : campaigns.child_range("campaign")) {
const std::string& addon_id = campaign["name"].str();
const std::string& addon_file = campaign["filename"].str();
if(get_addon(addon_id)) {
throw filesystem::io_exception("The addon '" + addon_id
+ "' already exists in the new form! Possible code or filesystem interference!\n");
}
if(std::find(legacy_addons.begin(), legacy_addons.end(), addon_id) == legacy_addons.end()) {
throw filesystem::io_exception("No file has been found for the legacy addon '" + addon_id
+ "'. Check the file structure!\n");
}
config data;
in = filesystem::istream_file(filesystem::normalize_path(addon_file));
read_gz(data, *in);
if(!data) {
throw filesystem::io_exception("Couldn't read the content file for the legacy addon '" + addon_id + "'!\n");
}
config version_cfg = config("version", campaign["version"].str());
version_cfg["filename"] = make_full_pack_filename(campaign["version"]);
campaign.add_child("version", version_cfg);
data.remove_attributes("title", "campaign_name", "author", "description", "version", "timestamp", "original_timestamp", "icon", "type", "tags");
filesystem::delete_file(filesystem::normalize_path(addon_file));
{
filesystem::atomic_commit campaign_file(addon_file + "/" + version_cfg["filename"].str());
config_writer writer(*campaign_file.ostream(), true, compress_level_);
writer.write(data);
campaign_file.commit();
}
{
filesystem::atomic_commit campaign_hash_file(addon_file + "/" + make_index_filename(campaign["version"]));
config_writer writer(*campaign_hash_file.ostream(), true, compress_level_);
config data_hash = config("name", "");
write_hashlist(data_hash, data);
writer.write(data_hash);
campaign_hash_file.commit();
}
addons_.emplace(addon_id, campaign);
mark_dirty(addon_id);
}
cfg_.clear_children("campaigns");
LOG_CS << "Legacy addons processing finished.\n";
write_config();
}
LOG_CS << "Loaded addons metadata. " << addons_.size() << " addons found.\n";
}
std::ostream& operator<<(std::ostream& o, const server::request& r)
{
o << '[' << r.addr << ' ' << r.cmd << "] ";
return o;
}
void server::handle_new_client(socket_ptr socket)
{
boost::asio::spawn(io_service_, [this, socket](boost::asio::yield_context yield) {
while(true) {
boost::system::error_code ec;
auto doc { coro_receive_doc(socket, yield[ec]) };
if(check_error(ec, socket) || !doc) return;
config data;
read(data, doc->output());
config::all_children_iterator i = data.ordered_begin();
if(i != data.ordered_end()) {
// We only handle the first child.
const config::any_child& c = *i;
request_handlers_table::const_iterator j
= handlers_.find(c.key);
if(j != handlers_.end()) {
// Call the handler.
request req{c.key, c.cfg, socket, yield};
auto st = service_timer(req);
j->second(this, req);
} else {
send_error("Unrecognized [" + c.key + "] request.",socket);
}
}
}
});
}
#ifndef _WIN32
void server::handle_read_from_fifo(const boost::system::error_code& error, std::size_t)
{
if(error) {
if(error == boost::asio::error::operation_aborted)
// This means fifo was closed by load_config() to open another fifo
return;
ERR_CS << "Error reading from fifo: " << error.message() << '\n';
return;
}
std::istream is(&admin_cmd_);
std::string cmd;
std::getline(is, cmd);
const control_line ctl = cmd;
if(ctl == "shut_down") {
LOG_CS << "Shut down requested by admin, shutting down...\n";
throw server_shutdown("Shut down via fifo command");
} else if(ctl == "readonly") {
if(ctl.args_count()) {
cfg_["read_only"] = read_only_ = utils::string_bool(ctl[1], true);
}
LOG_CS << "Read only mode: " << (read_only_ ? "enabled" : "disabled") << '\n';
} else if(ctl == "flush") {
LOG_CS << "Flushing config to disk...\n";
write_config();
} else if(ctl == "reload") {
if(ctl.args_count()) {
if(ctl[1] == "blacklist") {
LOG_CS << "Reloading blacklist...\n";
load_blacklist();
} else {
ERR_CS << "Unrecognized admin reload argument: " << ctl[1] << '\n';
}
} else {
LOG_CS << "Reloading all configuration...\n";
load_config();
LOG_CS << "Reloaded configuration\n";
}
} else if(ctl == "delete") {
if(ctl.args_count() != 1) {
ERR_CS << "Incorrect number of arguments for 'delete'\n";
} else {
const std::string& addon_id = ctl[1];
LOG_CS << "deleting add-on '" << addon_id << "' requested from control FIFO\n";
delete_addon(addon_id);
}
} else if(ctl == "hide" || ctl == "unhide") {
if(ctl.args_count() != 1) {
ERR_CS << "Incorrect number of arguments for '" << ctl.cmd() << "'\n";
} else {
const std::string& addon_id = ctl[1];
config& addon = get_addon(addon_id);
if(!addon) {
ERR_CS << "Add-on '" << addon_id << "' not found, cannot " << ctl.cmd() << "\n";
} else {
addon["hidden"] = ctl.cmd() == "hide";
mark_dirty(addon_id);
write_config();
LOG_CS << "Add-on '" << addon_id << "' is now " << (ctl.cmd() == "hide" ? "hidden" : "unhidden") << '\n';
}
}
} else if(ctl == "setpass") {
if(ctl.args_count() != 2) {
ERR_CS << "Incorrect number of arguments for 'setpass'\n";
} else {
const std::string& addon_id = ctl[1];
const std::string& newpass = ctl[2];
config& addon = get_addon(addon_id);
if(!addon) {
ERR_CS << "Add-on '" << addon_id << "' not found, cannot set passphrase\n";
} else if(newpass.empty()) {
// Shouldn't happen!
ERR_CS << "Add-on passphrases may not be empty!\n";
} else {
set_passphrase(addon, newpass);
mark_dirty(addon_id);
write_config();
LOG_CS << "New passphrase set for '" << addon_id << "'\n";
}
}
} else if(ctl == "setattr") {
if(ctl.args_count() != 3) {
ERR_CS << "Incorrect number of arguments for 'setattr'\n";
} else {
const std::string& addon_id = ctl[1];
const std::string& key = ctl[2];
const std::string& value = ctl[3];
config& addon = get_addon(addon_id);
if(!addon) {
ERR_CS << "Add-on '" << addon_id << "' not found, cannot set attribute\n";
} else if(key == "name" || key == "version") {
ERR_CS << "setattr cannot be used to rename add-ons or change their version\n";
} else if(key == "passhash"|| key == "passsalt") {
ERR_CS << "setattr cannot be used to set auth data -- use setpass instead\n";
} else if(!addon.has_attribute(key)) {
// NOTE: This is a very naive approach for validating setattr's
// input, but it should generally work since add-on
// uploads explicitly set all recognized attributes to
// the values provided by the .pbl data or the empty
// string if absent, and this is normally preserved by
// the config serialization.
ERR_CS << "Attribute '" << value << "' is not a recognized add-on attribute\n";
} else {
addon[key] = value;
mark_dirty(addon_id);
write_config();
LOG_CS << "Set attribute on add-on '" << addon_id << "':\n"
<< key << "=\"" << value << "\"\n";
}
}
} else {
ERR_CS << "Unrecognized admin command: " << ctl.full() << '\n';
}
read_from_fifo();
}
void server::handle_sighup(const boost::system::error_code&, int)
{
LOG_CS << "SIGHUP caught, reloading config.\n";
load_config(); // TODO: handle port number config changes
LOG_CS << "Reloaded configuration\n";
sighup_.async_wait(std::bind(&server::handle_sighup, this, std::placeholders::_1, std::placeholders::_2));
}
#endif
void server::flush_cfg()
{
flush_timer_.expires_from_now(std::chrono::minutes(10));
flush_timer_.async_wait(std::bind(&server::handle_flush, this, std::placeholders::_1));
}
void server::handle_flush(const boost::system::error_code& error)
{
if(error) {
ERR_CS << "Error from reload timer: " << error.message() << "\n";
throw boost::system::system_error(error);
}
write_config();
flush_cfg();
}
void server::load_blacklist()
{
// We *always* want to clear the blacklist first, especially if we are
// reloading the configuration and the blacklist is no longer enabled.
blacklist_.clear();
if(blacklist_file_.empty()) {
return;
}
try {
filesystem::scoped_istream in = filesystem::istream_file(blacklist_file_);
config blcfg;
read(blcfg, *in);
blacklist_.read(blcfg);
LOG_CS << "using blacklist from " << blacklist_file_ << '\n';
} catch(const config::error&) {
ERR_CS << "failed to read blacklist from " << blacklist_file_ << ", blacklist disabled\n";
}
}
void server::write_config()
{
DBG_CS << "writing configuration and add-ons list to disk...\n";
filesystem::atomic_commit out(cfg_file_);
write(*out.ostream(), cfg_);
out.commit();
for(const std::string& name : dirty_addons_) {
const config& addon = get_addon(name);
if(addon && !addon["filename"].empty()) {
filesystem::atomic_commit addon_out(filesystem::normalize_path(addon["filename"].str() + "/addon.cfg"));
write(*addon_out.ostream(), addon);
addon_out.commit();
}
}
dirty_addons_.clear();
DBG_CS << "... done\n";
}
void server::fire(const std::string& hook, [[maybe_unused]] const std::string& addon)
{
const std::map<std::string, std::string>::const_iterator itor = hooks_.find(hook);
if(itor == hooks_.end()) {
return;
}
const std::string& script = itor->second;
if(script.empty()) {
return;
}
#if defined(_WIN32)
ERR_CS << "Tried to execute a script on an unsupported platform\n";
return;
#else
pid_t childpid;
if((childpid = fork()) == -1) {
ERR_CS << "fork failed while updating add-on " << addon << '\n';
return;
}
if(childpid == 0) {
// We are the child process. Execute the script. We run as a
// separate thread sharing stdout/stderr, which will make the
// log look ugly.
execlp(script.c_str(), script.c_str(), addon.c_str(), static_cast<char *>(nullptr));
// exec() and family never return; if they do, we have a problem
std::cerr << "ERROR: exec failed with errno " << errno << " for addon " << addon
<< '\n';
exit(errno);
} else {
return;
}
#endif
}
bool server::ignore_address_stats(const std::string& addr) const
{
for(const auto& mask : stats_exempt_ips_) {
// TODO: we want CIDR subnet mask matching here, not glob matching!
if(utils::wildcard_string_match(addr, mask)) {
return true;
}
}
return false;
}
void server::send_message(const std::string& msg, socket_ptr sock)
{
const auto& escaped_msg = simple_wml_escape(msg);
simple_wml::document doc;
doc.root().add_child("message").set_attr_dup("message", escaped_msg.c_str());
async_send_doc_queued(sock, doc);
}
void server::send_error(const std::string& msg, socket_ptr sock)
{
ERR_CS << "[" << client_address(sock) << "] " << msg << '\n';
const auto& escaped_msg = simple_wml_escape(msg);
simple_wml::document doc;
doc.root().add_child("error").set_attr_dup("message", escaped_msg.c_str());
async_send_doc_queued(sock, doc);
}
void server::send_error(const std::string& msg, const std::string& extra_data, unsigned int status_code, socket_ptr sock)
{
const std::string& status_hex = formatter()
<< "0x" << std::setfill('0') << std::setw(2*sizeof(unsigned int)) << std::hex
<< std::uppercase << status_code;
ERR_CS << "[" << client_address(sock) << "]: (" << status_hex << ") " << msg << '\n';
const auto& escaped_status_str = simple_wml_escape(std::to_string(status_code));
const auto& escaped_msg = simple_wml_escape(msg);
const auto& escaped_extra_data = simple_wml_escape(extra_data);
simple_wml::document doc;
simple_wml::node& err_cfg = doc.root().add_child("error");
err_cfg.set_attr_dup("message", escaped_msg.c_str());
err_cfg.set_attr_dup("extra_data", escaped_extra_data.c_str());
err_cfg.set_attr_dup("status_code", escaped_status_str.c_str());
async_send_doc_queued(sock, doc);
}
config& server::get_addon(const std::string& id)
{
auto addon = addons_.find(id);
if(addon != addons_.end()) {
return addon->second;
} else {
return config::get_invalid();
}
}
void server::delete_addon(const std::string& id)
{
config& cfg = get_addon(id);
if(!cfg) {
ERR_CS << "Cannot delete unrecognized add-on '" << id << "'\n";
return;
}
std::string fn = cfg["filename"].str();
if(fn.empty()) {
ERR_CS << "Add-on '" << id << "' does not have an associated filename, cannot delete\n";
}
if(!filesystem::delete_directory(fn)) {
ERR_CS << "Could not delete the directory for addon '" << id
<< "' (" << fn << "): " << strerror(errno) << '\n';
}
addons_.erase(id);
write_config();
fire("hook_post_erase", id);
LOG_CS << "Deleted add-on '" << id << "'\n";
}
#define REGISTER_CAMPAIGND_HANDLER(req_id) \
handlers_[#req_id] = std::bind(&server::handle_##req_id, \
std::placeholders::_1, std::placeholders::_2)
void server::register_handlers()
{
REGISTER_CAMPAIGND_HANDLER(server_id);
REGISTER_CAMPAIGND_HANDLER(request_campaign_list);
REGISTER_CAMPAIGND_HANDLER(request_campaign);
REGISTER_CAMPAIGND_HANDLER(request_campaign_hash);
REGISTER_CAMPAIGND_HANDLER(request_terms);
REGISTER_CAMPAIGND_HANDLER(upload);
REGISTER_CAMPAIGND_HANDLER(delete);
REGISTER_CAMPAIGND_HANDLER(change_passphrase);
}
void server::handle_server_id(const server::request& req)
{
DBG_CS << req << "Sending server identification\n";
std::ostringstream ostr;
write(ostr, config{"server_id", config{
"cap", utils::join(capabilities_),
"version", game_config::revision,
"url", web_url_,
"license_notice", license_notice_,
}});
const auto& wml = ostr.str();
simple_wml::document doc(wml.c_str(), simple_wml::INIT_STATIC);
doc.compress();
async_send_doc_queued(req.sock, doc);
}
void server::handle_request_campaign_list(const server::request& req)
{
LOG_CS << req << "Sending add-ons list\n";
std::time_t epoch = std::time(nullptr);
config addons_list;
addons_list["timestamp"] = epoch;
if(req.cfg["times_relative_to"] != "now") {
epoch = 0;
}
bool before_flag = false;
std::time_t before = epoch;
if(!req.cfg["before"].empty()) {
before += req.cfg["before"].to_time_t();
before_flag = true;
}
bool after_flag = false;
std::time_t after = epoch;
if(!req.cfg["after"].empty()) {
after += req.cfg["after"].to_time_t();
after_flag = true;
}
const std::string& name = req.cfg["name"];
const std::string& lang = req.cfg["language"];
for(const auto& addon : addons_)
{
if(!name.empty() && name != addon.first) {
continue;
}
config i = addon.second;
if(i["hidden"].to_bool()) {
continue;
}
const auto& tm = i["timestamp"];
if(before_flag && (tm.empty() || tm.to_time_t(0) >= before)) {
continue;
}
if(after_flag && (tm.empty() || tm.to_time_t(0) <= after)) {
continue;
}
if(!lang.empty()) {
bool found = false;
for(const config& j : i.child_range("translation"))
{
if(j["language"] == lang && j["supported"].to_bool(true)) {//for old addons
found = true;
break;
}
}
if(!found) {
continue;
}
}
addons_list.add_child("campaign", i);
}
for(config& j : addons_list.child_range("campaign"))
{
// Remove attributes containing information that's considered sensitive
// or irrelevant to clients
j.remove_attributes("passphrase", "passhash", "passsalt", "upload_ip", "email");
// Build a feedback_url string attribute from the internal [feedback]
// data or deliver an empty value, in case clients decide to assume its
// presence.
const config& url_params = j.child_or_empty("feedback");
j["feedback_url"] = !url_params.empty() && !feedback_url_format_.empty()
? format_addon_feedback_url(feedback_url_format_, url_params) : "";
// Clients don't need to see the original data, so discard it.
j.clear_children("feedback");
// Update packs info is internal stuff
j.clear_children("update_pack");
}
config response;
response.add_child("campaigns", std::move(addons_list));
std::ostringstream ostr;
write(ostr, response);
std::string wml = ostr.str();
simple_wml::document doc(wml.c_str(), simple_wml::INIT_STATIC);
doc.compress();
async_send_doc_queued(req.sock, doc);
}
void server::handle_request_campaign(const server::request& req)
{
config& addon = get_addon(req.cfg["name"]);
if(!addon || addon["hidden"].to_bool()) {
send_error("Add-on '" + req.cfg["name"].str() + "' not found.", req.sock);
return;
}
const auto& name = req.cfg["name"].str();
auto version_map = get_version_map(addon);
if(version_map.empty()) {
send_error("No versions of the add-on '" + name + "' are available on the server.", req.sock);
return;
}
// Base the payload against the latest version if no particular version is being requested
const auto& from = req.cfg["from_version"].str();
const auto& to = req.cfg["version"].str(version_map.rbegin()->first);
const version_info from_parsed{from};
const version_info to_parsed{to};
auto to_version_iter = version_map.find(to_parsed);
if(to_version_iter == version_map.end()) {
send_error("Could not find requested version " + to + " of the addon '" + name +
"'.", req.sock);
return;
}
auto full_pack_path = addon["filename"].str() + '/' + to_version_iter->second["filename"].str();
const int full_pack_size = filesystem::file_size(full_pack_path);
// Assert `From < To` before attempting to do build an update sequence, since std::distance(A, B)
// requires A <= B to avoid UB with std::map (which doesn't support random access iterators) and
// we're going to be using that a lot next. We also can't do anything fancy with downgrades anyway,
// and same-version downloads can be regarded as though no From version was specified in order to
// keep things simple.
if(!from.empty() && from_parsed < to_parsed && version_map.count(from_parsed) != 0) {
// Build a sequence of updates beginning from the client's old version to the
// requested version. Every pair of incrementing versions on the server should
// have an update pack written to disk during the original upload(s).
//