fetch cookies and build number on startup

src/startup.cpp

@@ -0,0 +1,126 @@
+#include "startup.hpp"
+#include "abaddon.hpp"
+#include <future>
+#include <memory>
+
+DiscordStartupDialog::DiscordStartupDialog(Gtk::Window &window)
+    : Gtk::MessageDialog(window, "", false, Gtk::MESSAGE_INFO, Gtk::BUTTONS_NONE, true) {
+    m_dispatcher.connect(sigc::mem_fun(*this, &DiscordStartupDialog::DispatchCallback));
+
+    property_text() = "Getting connection info...";
+
+    RunAsync();
+}
+
+std::optional<std::string> DiscordStartupDialog::GetCookie() const {
+    return m_cookie;
+}
+
+std::optional<uint32_t> DiscordStartupDialog::GetBuildNumber() const {
+    return m_build_number;
+}
+
+// good enough
+std::optional<std::pair<std::string, std::string>> ParseCookie(const Glib::ustring &str) {
+    auto regex = Glib::Regex::create("\\t");
+    const std::vector<Glib::ustring> split = regex->split(str);
+    if (split.size() < 7) return {};
+
+    return { { split[5], split[6] } };
+}
+
+std::optional<Glib::ustring> GetJavascriptFileFromAppPage(const Glib::ustring &contents) {
+    auto regex = Glib::Regex::create(R"(app-mount.*(/assets/[\w\d]*.js).*/assets/[\w\d]*.js)");
+    Glib::MatchInfo match;
+    if (regex->match(contents, match)) {
+        return match.fetch(1);
+    }
+
+    return {};
+}
+
+std::optional<uint32_t> GetBuildNumberFromJSURL(const Glib::ustring &url, const std::string &cookie) {
+    http::request req(http::REQUEST_GET, "https://discord.com" + url);
+    req.set_header("Accept-Language", "en-US,en;q=0.9");
+    req.set_header("Sec-Fetch-Dest", "document");
+    req.set_header("Sec-Fetch-Mode", "navigate");
+    req.set_header("Sec-Fetch-Site", "none");
+    req.set_header("Sec-Fetch-User", "?1");
+    req.set_user_agent(Abaddon::Get().GetSettings().UserAgent);
+
+    curl_easy_setopt(req.get_curl(), CURLOPT_COOKIE, cookie.c_str());
+
+    auto res = req.execute();
+    if (res.error) return {};
+
+    auto regex = Glib::Regex::create(R"("buildNumber",null!==\(t="(\d+)\"\))");
+    Glib::MatchInfo match;
+    if (regex->match(res.text, match)) {
+        const auto str_value = match.fetch(1);
+        try {
+            return std::stoul(str_value);
+        } catch (...) { return {}; }
+    }
+
+    return {};
+}
+
+std::pair<std::optional<std::string>, std::string> GetCookieTask() {
+    http::request req(http::REQUEST_GET, "https://discord.com/app");
+    req.set_header("Accept-Language", "en-US,en;q=0.9");
+    req.set_header("Sec-Fetch-Dest", "document");
+    req.set_header("Sec-Fetch-Mode", "navigate");
+    req.set_header("Sec-Fetch-Site", "none");
+    req.set_header("Sec-Fetch-User", "?1");
+    req.set_user_agent(Abaddon::Get().GetSettings().UserAgent);
+
+    curl_easy_setopt(req.get_curl(), CURLOPT_COOKIEFILE, "");
+
+    auto res = req.execute();
+    if (res.error) return {};
+
+    curl_slist *slist;
+    if (curl_easy_getinfo(req.get_curl(), CURLINFO_COOKIELIST, &slist) != CURLE_OK) {
+        return {};
+    }
+
+    std::string dcfduid;
+    std::string sdcfduid;
+
+    for (auto *cur = slist; cur != nullptr; cur = cur->next) {
+        const auto cookie = ParseCookie(cur->data);
+        if (cookie.has_value()) {
+            if (cookie->first == "__dcfduid") {
+                dcfduid = cookie->second;
+            } else if (cookie->first == "__sdcfduid") {
+                sdcfduid = cookie->second;
+            }
+        }
+    }
+    curl_slist_free_all(slist);
+
+    if (!dcfduid.empty() && !sdcfduid.empty()) {
+        return { "__dcfduid=" + dcfduid + "; __sdcfduid=" + sdcfduid, res.text };
+    }
+
+    return {};
+}
+
+void DiscordStartupDialog::RunAsync() {
+    auto futptr = std::make_shared<std::future<void>>();
+    *futptr = std::async(std::launch::async, [this, futptr] {
+        auto [opt_cookie, app_page] = GetCookieTask();
+        m_cookie = opt_cookie;
+        if (opt_cookie.has_value()) {
+            auto js_url = GetJavascriptFileFromAppPage(app_page);
+            if (js_url.has_value()) {
+                m_build_number = GetBuildNumberFromJSURL(*js_url, *opt_cookie);
+            }
+        }
+        m_dispatcher.emit();
+    });
+}
+
+void DiscordStartupDialog::DispatchCallback() {
+    response(Gtk::RESPONSE_OK);
+}