1 files changed, 139 insertions, 0 deletions
diff --git a/src/frontend_common/update_checker.cpp b/src/frontend_common/update_checker.cpp
new file mode 100644
index 0000000000..230f26dea2
--- /dev/null
+++ b/src/frontend_common/update_checker.cpp
@@ -0,0 +1,139 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+// Copyright Citra Emulator Project / Azahar Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "update_checker.h"
+#include "common/logging/log.h"
+#include "common/scm_rev.h"
+#include <fmt/format.h>
+
+#ifndef CPPHTTPLIB_OPENSSL_SUPPORT
+#define CPPHTTPLIB_OPENSSL_SUPPORT
+#endif
+
+#include <httplib.h>
+
+#ifdef YUZU_BUNDLED_OPENSSL
+#include <openssl/cert.h>
+#endif
+
+#include <nlohmann/json.hpp>
+#include <optional>
+#include <string>
+
+std::optional<std::string> UpdateChecker::GetResponse(std::string url, std::string path)
+{
+    try {
+        constexpr std::size_t timeout_seconds = 15;
+
+        std::unique_ptr<httplib::Client> client = std::make_unique<httplib::Client>(url);
+        client->set_connection_timeout(timeout_seconds);
+        client->set_read_timeout(timeout_seconds);
+        client->set_write_timeout(timeout_seconds);
+
+#ifdef YUZU_BUNDLED_OPENSSL
+        client->load_ca_cert_store(kCert, sizeof(kCert));
+#endif
+
+        if (client == nullptr) {
+            LOG_ERROR(Frontend, "Invalid URL {}{}", url, path);
+            return {};
+        }
+
+        httplib::Request request{
+            .method = "GET",
+            .path = path,
+        };
+
+        client->set_follow_location(true);
+        httplib::Result result;
+        result = client->send(request);
+
+        if (!result) {
+            LOG_ERROR(Frontend, "GET to {}{} returned null", url, path);
+            return {};
+        }
+
+        const auto &response = result.value();
+        if (response.status >= 400) {
+            LOG_ERROR(Frontend,
+                      "GET to {}{} returned error status code: {}",
+                      url,
+                      path,
+                      response.status);
+            return {};
+        }
+        if (!response.headers.contains("content-type")) {
+            LOG_ERROR(Frontend, "GET to {}{} returned no content", url, path);
+            return {};
+        }
+
+        return response.body;
+    } catch (std::exception &e) {
+        LOG_ERROR(Frontend,
+                  "GET to {}{} failed during update check: {}",
+                  url,
+                  path,
+                  e.what());
+        return std::nullopt;
+    }
+}
+
+std::optional<std::string> UpdateChecker::GetLatestRelease(bool include_prereleases) {
+    const auto update_check_url = std::string{Common::g_build_auto_update_api};
+    std::string update_check_path = fmt::format("/repos/{}",
+                                                std::string{Common::g_build_auto_update_repo});
+    try {
+        if (include_prereleases) { // This can return either a prerelease or a stable release,
+            // whichever is more recent.
+            const auto update_check_tags_path = update_check_path + "/tags";
+            const auto update_check_releases_path = update_check_path + "/releases";
+
+            const auto tags_response = UpdateChecker::GetResponse(update_check_url, update_check_tags_path);
+            const auto releases_response = UpdateChecker::GetResponse(update_check_url, update_check_releases_path);
+
+            if (!tags_response || !releases_response)
+                return {};
+
+            const std::string latest_tag
+                = nlohmann::json::parse(tags_response.value()).at(0).at("name");
+            const bool latest_tag_has_release = releases_response.value().find(
+                                                    fmt::format("\"{}\"", latest_tag))
+                                                != std::string::npos;
+
+            // If there is a newer tag, but that tag has no associated release, don't prompt the
+            // user to update.
+            if (!latest_tag_has_release)
+                return {};
+
+            return latest_tag;
+        } else { // This is a stable release, only check for other stable releases.
+            update_check_path += "/releases/latest";
+            const auto response = UpdateChecker::GetResponse(update_check_url, update_check_path);
+
+            if (!response)
+                return {};
+
+            const std::string latest_tag = nlohmann::json::parse(response.value()).at("tag_name");
+            return latest_tag;
+        }
+
+    } catch (nlohmann::detail::out_of_range &) {
+        LOG_ERROR(Frontend,
+                  "Parsing JSON response from {}{} failed during update check: "
+                  "nlohmann::detail::out_of_range",
+                  update_check_url,
+                  update_check_path);
+        return {};
+    } catch (nlohmann::detail::type_error &) {
+        LOG_ERROR(Frontend,
+                  "Parsing JSON response from {}{} failed during update check: "
+                  "nlohmann::detail::type_error",
+                  update_check_url,
+                  update_check_path);
+        return {};
+    }
+}