Add update notice and require release build secrets

src/app.cpp

@@ -1,5 +1,9 @@
 #include "app.h"
 
+#include <array>
+#include <cstdio>
+#include <future>
+
 #include <curses.h>
 
 #include "build_config.h"
@@ -14,6 +18,66 @@ bool is_truthy_env_value(const std::string &value) {
 	       value == "YES" || value == "on" || value == "ON";
 }
 
+std::string shell_quote(const std::string &value) {
+	std::string quoted = "'";
+	for (char ch : value) {
+		if (ch == '\'') {
+			quoted += "'\\''";
+		} else {
+			quoted.push_back(ch);
+		}
+	}
+	quoted.push_back('\'');
+	return quoted;
+}
+
+std::string run_command_capture(const std::string &command) {
+	FILE *pipe = popen(command.c_str(), "r");
+	if (pipe == nullptr) {
+		return {};
+	}
+
+	std::string output;
+	std::array<char, 4096> buffer{};
+	while (std::fgets(buffer.data(), static_cast<int>(buffer.size()), pipe) != nullptr) {
+		output += buffer.data();
+	}
+	if (pclose(pipe) != 0) {
+		return {};
+	}
+	return output;
+}
+
+std::optional<std::string> fetch_update_notice() {
+	static constexpr const char *kLatestReleaseApiUrl =
+	        "https://git.mshq.dev/api/v1/repos/AxiFisk/shinoa/releases/tags/latest";
+
+	if (std::string(TELEGRAM_TUI_BUILD_COMMIT).empty()) {
+		return std::nullopt;
+	}
+
+	const std::string response =
+	        run_command_capture("curl -fsSL " + shell_quote(kLatestReleaseApiUrl) + " 2>/dev/null");
+	if (response.empty()) {
+		return std::nullopt;
+	}
+
+	try {
+		const json release = json::parse(response, nullptr, true, true);
+		const std::string target_commit = safe_string(release, "target_commitish");
+		if (target_commit.empty()) {
+			return std::nullopt;
+		}
+		const std::string current_commit = TELEGRAM_TUI_BUILD_COMMIT;
+		if (target_commit == current_commit || target_commit.rfind(current_commit, 0) == 0) {
+			return std::nullopt;
+		}
+		return std::string("Update available");
+	} catch (const json::exception &) {
+		return std::nullopt;
+	}
+}
+
 } // namespace
 
 App::App() {
@@ -49,6 +113,8 @@ App::App() {
 	if (use_test_dc_) {
 		status_line_ = "Starting TDLib in test DC mode...";
 	}
+
+	start_update_check();
 }
 
 int App::run() {
@@ -80,6 +146,27 @@ int App::run() {
 	return 0;
 }
 
+void App::start_update_check() {
+	update_check_future_ =
+	        std::async(std::launch::async, []() { return fetch_update_notice(); });
+}
+
+bool App::refresh_update_check_result() {
+	if (!update_check_future_.valid()) {
+		return false;
+	}
+	if (update_check_future_.wait_for(std::chrono::seconds(0)) != std::future_status::ready) {
+		return false;
+	}
+
+	const auto notice = update_check_future_.get();
+	if (notice == update_notice_) {
+		return false;
+	}
+	update_notice_ = notice.value_or(std::string());
+	return true;
+}
+
 std::optional<std::int64_t> App::highlighted_chat_id() const {
 	if (sorted_chat_ids_.empty()) {
 		return std::nullopt;