Make update checker use libcurl and https

The horrible hack with the curl_meson subproject is needed since the
libcurl dependency generated by libcurl's cmake build system (via
meson's cmake module) includes its internal files its
include_directories, which shadows certain other includes. So instead
we manually replace the include_directories with the correct ones, taken
from a separate meson subproject. This needs an additional wrap file,
but it points to the same subproject directory in order to prevent there
being multiple downloads of the same libcurl source that could go out of
sync at some point.

Co-authored-by: sepro <4618135+seproDev@users.noreply.github.com>

.gitignore

@@ -20,6 +20,7 @@ tools/repack-thes-dict.dSYM
 build*/
 subprojects/boost*/
 subprojects/cairo*
+subprojects/curl-*
 subprojects/ffmpeg
 subprojects/ffms2*
 subprojects/fontconfig*

meson.build

@@ -69,6 +69,10 @@ if get_option('official_release')
     conf.set('AEGI_OFFICIAL_RELEASE', 1)
 endif
 conf.set('WITH_UPDATE_CHECKER', get_option('enable_update_checker'))
+if get_option('enable_update_checker')
+    conf.set_quoted('UPDATE_CHECKER_SERVER', get_option('update_server'))
+    conf.set_quoted('UPDATE_CHECKER_BASE_URL', get_option('update_url'))
+endif
 
 deps = []
 deps_inc = []
@@ -277,6 +281,41 @@ endif
 conf_platform = configuration_data()
 conf_platform.set('DEFAULT_PLAYER_AUDIO', def_audio)
 
+if get_option('enable_update_checker')
+    libcurl_dep = dependency('libcurl', required: false)
+
+    if (not libcurl_dep.found())
+        libcurl_opt = cmake.subproject_options()
+        options_dict = {
+            'HTTP_ONLY': true,
+            'BUILD_CURL_EXE': false,
+            'CMAKE_BUILD_TYPE': get_option('buildtype') == 'release' ? 'Release' : 'Debug',
+        }
+        if host_machine.system() == 'windows'
+            options_dict += {'CURL_USE_SCHANNEL': true}
+            deps += cc.find_library('crypt32')
+        elif host_machine.system() == 'darwin'
+            options_dict += {'CURL_USE_SECTRANSP': true}
+        else
+            options_dict += {'CURL_USE_OPENSSL': true}
+        endif
+        if get_option('default_library') == 'static' and (host_machine.system() == 'windows' or host_machine.system() == 'darwin')
+            options_dict += {'BUILD_SHARED_LIBS': false}
+            add_project_arguments('-DCURL_STATICLIB', language: ['cpp'])
+        endif
+        libcurl_opt.add_cmake_defines(options_dict)
+        libcurl = cmake.subproject('curl', options: libcurl_opt)
+
+        libcurl_dep = libcurl.dependency('libcurl')
+
+        # Horrible meson hack to work around the cmake subproject creating broken include directories
+        libcurl_dep = libcurl_dep.partial_dependency(compile_args: true, link_args: true, links: true, sources: true)
+        libcurl_fixed_inc = declare_dependency(include_directories: subproject('curl_meson').get_variable('libcurl_fixed_inc'))
+        deps += [libcurl_fixed_inc]
+    endif
+    deps += [libcurl_dep]
+endif
+
 luajit = dependency('luajit', version: '>=2.0.0', required: get_option('system_luajit'))
 if luajit.found() and luajit.type_name() != 'internal'
     luajit_test = cc.run('''#include <lauxlib.h>

meson_options.txt

@@ -21,8 +21,8 @@ option('wx_version', type: 'string', value: '3.0.0', description: 'The minimum w
 option('credit', type: 'string', value: '', description: 'Build credit shown in program title')
 option('official_release', type: 'boolean', value: false, description: 'Set on official builds')
 
-option('enable_update_checker', type: 'boolean', value: false, description: 'Enable the update checker')
-option('update_server', type: 'string', value: 'updates.aegisub.org', description: 'Server to use for the update checker')
+option('enable_update_checker', type: 'boolean', value: true, description: 'Enable the update checker')
+option('update_server', type: 'string', value: 'https://updates.aegisub.org', description: 'Server to use for the update checker')
 option('update_url', type: 'string', value: '/trunk', description: 'Base path to use for the update checker')
 
 option('build_osx_bundle', type: 'boolean', value: 'false', description: 'Package Aegisub.app on OSX')

src/dialog_version_check.cpp

@@ -29,10 +29,6 @@
 
 #ifdef WITH_UPDATE_CHECKER
 
-#ifdef _MSC_VER
-#pragma warning(disable : 4250) // 'boost::asio::basic_socket_iostream<Protocol>' : inherits 'std::basic_ostream<_Elem,_Traits>::std::basic_ostream<_Elem,_Traits>::_Add_vtordisp2' via dominance
-#endif
-
 #include "compat.h"
 #include "format.h"
 #include "options.h"
@@ -46,9 +42,10 @@
 #include <libaegisub/split.h>
 
 #include <ctime>
-#include <boost/asio/ip/tcp.hpp>
+#include <curl/curl.h>
 #include <functional>
 #include <mutex>
+#include <sstream>
 #include <vector>
 #include <wx/button.h>
 #include <wx/checkbox.h>
@@ -280,44 +277,46 @@ static wxString GetAegisubLanguage() {
 	return to_wx(OPT_GET("App/Language")->GetString());
 }
 
+size_t writeToStringCb(char *contents, size_t size, size_t nmemb, std::string *s) {
+	s->append(contents, size * nmemb);
+	return size * nmemb;
+}
+
 void DoCheck(bool interactive) {
-	boost::asio::ip::tcp::iostream stream;
-	stream.connect(UPDATE_CHECKER_SERVER, "http");
-	if (!stream)
-		throw VersionCheckError(from_wx(_("Could not connect to updates server.")));
+	CURL *curl;
+	CURLcode res_code;
 
-	agi::format(stream,
-		"GET %s?rev=%d&rel=%d&os=%s&lang=%s&aegilang=%s HTTP/1.0\r\n"
-		"User-Agent: Aegisub %s\r\n"
-		"Host: %s\r\n"
-		"Accept: */*\r\n"
-		"Connection: close\r\n\r\n"
-		, UPDATE_CHECKER_BASE_URL
-		, GetSVNRevision()
-		, (GetIsOfficialRelease() ? 1 : 0)
-		, GetOSShortName()
-		, GetSystemLanguage()
-		, GetAegisubLanguage()
-		, GetAegisubLongVersionString()
-		, UPDATE_CHECKER_SERVER);
+	curl = curl_easy_init();
+	if (!curl)
+		throw VersionCheckError(from_wx(_("Curl could not be initialized.")));
 
-	std::string http_version;
-	stream >> http_version;
-	int status_code;
-	stream >> status_code;
-	if (!stream || http_version.substr(0, 5) != "HTTP/")
-		throw VersionCheckError(from_wx(_("Could not download from updates server.")));
-	if (status_code != 200)
-		throw VersionCheckError(agi::format(_("HTTP request failed, got HTTP response %d."), status_code));
+	curl_easy_setopt(curl, CURLOPT_URL,
+		agi::format("%s%s?rev=%d&rel=%d&os=%s&lang=%s&aegilang=%s"
+			, UPDATE_CHECKER_SERVER
+			, UPDATE_CHECKER_BASE_URL
+			, GetSVNRevision()
+			, (GetIsOfficialRelease() ? 1 : 0)
+			, GetOSShortName()
+			, GetSystemLanguage()
+			, GetAegisubLanguage()
+		).c_str());
+	curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
+	curl_easy_setopt(curl, CURLOPT_USERAGENT, agi::format("Aegisub %s", GetAegisubLongVersionString()).c_str());
 
-	stream.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
+	std::string result;
+	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writeToStringCb);
+	curl_easy_setopt(curl, CURLOPT_WRITEDATA, &result);
 
-	// Skip the headers since we don't care about them
-	for (auto const& header : agi::line_iterator<std::string>(stream))
-		if (header.empty()) break;
+	res_code = curl_easy_perform(curl);
+	curl_easy_cleanup(curl);
+	if (res_code != CURLE_OK) {
+		std::string err_msg = agi::format(_("Checking for updates failed: %s."), curl_easy_strerror(res_code));
+		throw VersionCheckError(err_msg);
+	}
 
+	std::stringstream ss(result);
 	std::vector<AegisubUpdateDescription> results;
-	for (auto const& line : agi::line_iterator<std::string>(stream)) {
+	for (auto const& line : agi::line_iterator<std::string>(ss)) {
 		if (line.empty()) continue;
 
 		std::vector<std::string> parsed;

subprojects/curl.wrap

@@ -0,0 +1,9 @@
+[wrap-file]
+directory = curl-7.82.0
+source_url = https://github.com/curl/curl/releases/download/curl-7_82_0/curl-7.82.0.tar.gz
+source_filename = curl-7.82.0.tar.xz
+source_hash = 910cc5fe279dc36e2cca534172c94364cf3fcf7d6494ba56e6c61a390881ddce
+patch_directory = curl
+
+[provide]
+dependency_names = libcurl

subprojects/curl_meson.wrap

@@ -0,0 +1,6 @@
+[wrap-file]
+directory = curl-7.82.0
+source_url = https://github.com/curl/curl/releases/download/curl-7_82_0/curl-7.82.0.tar.gz
+source_filename = curl-7.82.0.tar.xz
+source_hash = 910cc5fe279dc36e2cca534172c94364cf3fcf7d6494ba56e6c61a390881ddce
+patch_directory = curl

subprojects/packagefiles/curl/meson.build

@@ -0,0 +1,3 @@
+project('curl_meson', 'cpp')
+
+libcurl_fixed_inc = include_directories('include/')