3 files changed, 232 insertions, 0 deletions

diff --git a/src/core/hle/service/am/am.cpp b/src/core/hle/service/am/am.cpp
index 512386422..c851e5420 100644
--- a/src/core/hle/service/am/am.cpp
+++ b/src/core/hle/service/am/am.cpp
@@ -23,6 +23,7 @@
 #include "core/hle/service/am/applets/profile_select.h"
 #include "core/hle/service/am/applets/software_keyboard.h"
 #include "core/hle/service/am/applets/stub_applet.h"
+#include "core/hle/service/am/applets/web_browser.h"
 #include "core/hle/service/am/idle.h"
 #include "core/hle/service/am/omm.h"
 #include "core/hle/service/am/spsm.h"
@@ -43,6 +44,7 @@ constexpr ResultCode ERR_SIZE_OUT_OF_BOUNDS{ErrorModule::AM, 0x1F7};
 enum class AppletId : u32 {
     ProfileSelect = 0x10,
     SoftwareKeyboard = 0x11,
+    LibAppletOff = 0x17,
 };
 
 constexpr u32 POP_LAUNCH_PARAMETER_MAGIC = 0xC79497CA;
@@ -782,6 +784,8 @@ static std::shared_ptr<Applets::Applet> GetAppletFromId(AppletId id) {
         return std::make_shared<Applets::ProfileSelect>();
     case AppletId::SoftwareKeyboard:
         return std::make_shared<Applets::SoftwareKeyboard>();
+    case AppletId::LibAppletOff:
+        return std::make_shared<Applets::WebBrowser>();
     default:
         LOG_ERROR(Service_AM, "Unimplemented AppletId [{:08X}]! -- Falling back to stub!",
                   static_cast<u32>(id));
diff --git a/src/core/hle/service/am/applets/web_browser.cpp b/src/core/hle/service/am/applets/web_browser.cpp
new file mode 100644
index 000000000..53118324b
--- /dev/null
+++ b/src/core/hle/service/am/applets/web_browser.cpp
@@ -0,0 +1,184 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/common_paths.h"
+#include "common/hex_util.h"
+#include "common/logging/backend.h"
+#include "common/string_util.h"
+#include "core/core.h"
+#include "core/file_sys/content_archive.h"
+#include "core/file_sys/mode.h"
+#include "core/file_sys/nca_metadata.h"
+#include "core/file_sys/registered_cache.h"
+#include "core/file_sys/romfs.h"
+#include "core/file_sys/romfs_factory.h"
+#include "core/file_sys/vfs_types.h"
+#include "core/frontend/applets/web_browser.h"
+#include "core/hle/kernel/process.h"
+#include "core/hle/service/am/applets/web_browser.h"
+#include "core/hle/service/filesystem/filesystem.h"
+#include "core/loader/loader.h"
+
+namespace Service::AM::Applets {
+
+// TODO(DarkLordZach): There are other arguments in the WebBuffer structure that are currently not
+// parsed, for example footer mode and left stick mode. Some of these are not particularly relevant,
+// but some may be worth an implementation.
+constexpr u16 WEB_ARGUMENT_URL_TYPE = 0x6;
+
+struct WebBufferHeader {
+    u16 count;
+    INSERT_PADDING_BYTES(6);
+};
+static_assert(sizeof(WebBufferHeader) == 0x8, "WebBufferHeader has incorrect size.");
+
+struct WebArgumentHeader {
+    u16 type;
+    u16 size;
+    u32 offset;
+};
+static_assert(sizeof(WebArgumentHeader) == 0x8, "WebArgumentHeader has incorrect size.");
+
+struct WebArgumentResult {
+    u32 result_code;
+    std::array<char, 0x1000> last_url;
+    u64 last_url_size;
+};
+static_assert(sizeof(WebArgumentResult) == 0x1010, "WebArgumentResult has incorrect size.");
+
+static std::vector<u8> GetArgumentDataForTagType(const std::vector<u8>& data, u16 type) {
+    WebBufferHeader header;
+    std::memcpy(&header, data.data(), sizeof(WebBufferHeader));
+
+    u64 offset = sizeof(WebBufferHeader);
+    for (u16 i = 0; i < header.count; ++i) {
+        WebArgumentHeader arg;
+        std::memcpy(&arg, data.data() + offset, sizeof(WebArgumentHeader));
+        offset += sizeof(WebArgumentHeader);
+
+        if (arg.type == type) {
+            std::vector<u8> out(arg.size);
+            offset += arg.offset;
+            std::memcpy(out.data(), data.data() + offset, out.size());
+            return out;
+        }
+
+        offset += arg.offset + arg.size;
+    }
+
+    return {};
+}
+
+static FileSys::VirtualFile GetManualRomFS() {
+    auto& loader{Core::System::GetInstance().GetAppLoader()};
+
+    FileSys::VirtualFile out;
+    if (loader.ReadManualRomFS(out) == Loader::ResultStatus::Success)
+        return out;
+
+    const auto& installed{FileSystem::GetUnionContents()};
+    const auto res = installed.GetEntry(Core::System::GetInstance().CurrentProcess()->GetTitleID(),
+                                        FileSys::ContentRecordType::Manual);
+
+    if (res != nullptr)
+        return res->GetRomFS();
+    return nullptr;
+}
+
+WebBrowser::WebBrowser() = default;
+
+WebBrowser::~WebBrowser() = default;
+
+void WebBrowser::Initialize() {
+    complete = false;
+    temporary_dir.clear();
+    filename.clear();
+    status = RESULT_SUCCESS;
+
+    Applet::Initialize();
+
+    const auto web_arg_storage = broker.PopNormalDataToApplet();
+    ASSERT(web_arg_storage != nullptr);
+    const auto& web_arg = web_arg_storage->GetData();
+
+    LOG_CRITICAL(Service_AM, "{}", Common::HexVectorToString(web_arg));
+
+    const auto url_data = GetArgumentDataForTagType(web_arg, WEB_ARGUMENT_URL_TYPE);
+    filename = Common::StringFromFixedZeroTerminatedBuffer(
+        reinterpret_cast<const char*>(url_data.data()), url_data.size());
+
+    temporary_dir = FileUtil::SanitizePath(FileUtil::GetUserPath(FileUtil::UserPath::CacheDir) +
+                                               "web_applet_manual",
+                                           FileUtil::DirectorySeparator::PlatformDefault);
+    FileUtil::DeleteDirRecursively(temporary_dir);
+
+    manual_romfs = GetManualRomFS();
+    if (manual_romfs == nullptr) {
+        status = ResultCode(-1);
+        LOG_ERROR(Service_AM, "Failed to find manual for current process!");
+    }
+
+    filename =
+        FileUtil::SanitizePath(temporary_dir + DIR_SEP + "html-document" + DIR_SEP + filename,
+                               FileUtil::DirectorySeparator::PlatformDefault);
+}
+
+bool WebBrowser::TransactionComplete() const {
+    return complete;
+}
+
+ResultCode WebBrowser::GetStatus() const {
+    return status;
+}
+
+void WebBrowser::ExecuteInteractive() {
+    UNIMPLEMENTED_MSG(Service_AM, "Unexpected interactive data recieved!");
+}
+
+void WebBrowser::Execute() {
+    if (complete)
+        return;
+
+    if (status != RESULT_SUCCESS) {
+        complete = true;
+        return;
+    }
+
+    const auto& frontend{Core::System::GetInstance().GetWebBrowser()};
+
+    frontend.OpenPage(
+        filename, [this] { UnpackRomFS(); }, [this] { Finalize(); });
+}
+
+void WebBrowser::UnpackRomFS() {
+    if (unpacked)
+        return;
+
+    ASSERT(manual_romfs != nullptr);
+    const auto dir =
+        FileSys::ExtractRomFS(manual_romfs, FileSys::RomFSExtractionType::SingleDiscard);
+    const auto& vfs{Core::System::GetInstance().GetFilesystem()};
+    const auto temp_dir = vfs->CreateDirectory(temporary_dir, FileSys::Mode::ReadWrite);
+    FileSys::VfsRawCopyD(dir, temp_dir);
+
+    unpacked = true;
+}
+
+void WebBrowser::Finalize() {
+    complete = true;
+
+    WebArgumentResult out{};
+    out.result_code = 0;
+    out.last_url_size = 0;
+
+    std::vector<u8> data(sizeof(WebArgumentResult));
+    std::memcpy(data.data(), &out, sizeof(WebArgumentResult));
+
+    broker.PushNormalDataFromApplet(IStorage{data});
+    broker.SignalStateChanged();
+
+    FileUtil::DeleteDirRecursively(temporary_dir);
+}
+
+} // namespace Service::AM::Applets
diff --git a/src/core/hle/service/am/applets/web_browser.h b/src/core/hle/service/am/applets/web_browser.h
new file mode 100644
index 000000000..b9e228fac
--- /dev/null
+++ b/src/core/hle/service/am/applets/web_browser.h
@@ -0,0 +1,44 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "core/file_sys/vfs_types.h"
+#include "core/hle/service/am/am.h"
+#include "core/hle/service/am/applets/applets.h"
+
+namespace Service::AM::Applets {
+
+class WebBrowser final : public Applet {
+public:
+    WebBrowser();
+    ~WebBrowser() override;
+
+    void Initialize() override;
+
+    bool TransactionComplete() const override;
+    ResultCode GetStatus() const override;
+    void ExecuteInteractive() override;
+    void Execute() override;
+
+    // Callback to be fired when the frontend needs the manual RomFS unpacked to temporary
+    // directory. This is a blocking call and may take a while as some manuals can be up to 100MB in
+    // size. Attempting to access files at filename before invocation is likely to not work.
+    void UnpackRomFS();
+
+    // Callback to be fired when the frontend is finished browsing. This will delete the temporary
+    // manual RomFS extracted files, so ensure this is only called at actual finalization.
+    void Finalize();
+
+private:
+    bool complete = false;
+    bool unpacked = false;
+    ResultCode status = RESULT_SUCCESS;
+
+    FileSys::VirtualFile manual_romfs;
+    std::string temporary_dir;
+    std::string filename;
+};
+
+} // namespace Service::AM::Applets