144 lines
3.8 KiB
C++
144 lines
3.8 KiB
C++
// This file Copyright © 2012-2022 Mnemosyne LLC.
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// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
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// or any future license endorsed by Mnemosyne LLC.
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// License text can be found in the licenses/ folder.
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#include <array>
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#include <memory>
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#include <string>
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#include <glib/gstdio.h> /* g_remove() */
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#include <libtransmission/transmission.h>
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#include <libtransmission/web.h> // tr_sessionFetch()
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#include <libtransmission/web-utils.h>
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#include "FaviconCache.h"
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#include "Utils.h" /* gtr_get_host_from_url() */
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namespace
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{
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std::array<char const*, 4> const image_types = { "ico", "png", "gif", "jpg" };
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struct favicon_data
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{
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tr_session* session = nullptr;
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std::function<void(Glib::RefPtr<Gdk::Pixbuf> const&)> func;
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std::string host;
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std::string contents;
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size_t type = 0;
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};
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Glib::ustring get_url(std::string const& host, size_t image_type)
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{
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return gtr_sprintf("http://%s/favicon.%s", host, image_types[image_type]);
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}
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std::string favicon_get_cache_dir()
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{
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static std::string dir;
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if (dir.empty())
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{
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dir = Glib::build_filename(Glib::get_user_cache_dir(), "transmission", "favicons");
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(void)g_mkdir_with_parents(dir.c_str(), 0777);
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}
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return dir;
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}
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std::string favicon_get_cache_filename(std::string const& host)
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{
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return Glib::build_filename(favicon_get_cache_dir(), host);
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}
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void favicon_save_to_cache(std::string const& host, std::string const& data)
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{
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Glib::file_set_contents(favicon_get_cache_filename(host), data);
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}
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Glib::RefPtr<Gdk::Pixbuf> favicon_load_from_cache(std::string const& host)
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{
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auto const filename = favicon_get_cache_filename(host);
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try
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{
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return Gdk::Pixbuf::create_from_file(filename, 16, 16, false);
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}
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catch (Glib::Error const&)
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{
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g_remove(filename.c_str());
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return {};
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}
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}
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void favicon_web_done_cb(tr_web::FetchResponse const& response);
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bool favicon_web_done_idle_cb(std::unique_ptr<favicon_data> fav)
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{
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Glib::RefPtr<Gdk::Pixbuf> pixbuf;
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if (!fav->contents.empty()) /* we got something... try to make a pixbuf from it */
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{
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favicon_save_to_cache(fav->host, fav->contents);
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pixbuf = favicon_load_from_cache(fav->host);
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}
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if (pixbuf == nullptr && ++fav->type < image_types.size()) /* keep trying */
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{
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fav->contents.clear();
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auto* const session = fav->session;
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auto const next_url = get_url(fav->host, fav->type);
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tr_sessionFetch(session, { next_url.raw(), favicon_web_done_cb, fav.release() });
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}
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// Not released into the next web request, means we're done trying (even if `pixbuf` is still invalid)
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if (fav != nullptr)
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{
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fav->func(pixbuf);
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}
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return false;
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}
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void favicon_web_done_cb(tr_web::FetchResponse const& response)
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{
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auto* const fav = static_cast<favicon_data*>(response.user_data);
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fav->contents = response.body;
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Glib::signal_idle().connect([fav]() { return favicon_web_done_idle_cb(std::unique_ptr<favicon_data>(fav)); });
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}
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} // namespace
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void gtr_get_favicon(
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tr_session* session,
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std::string const& host,
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std::function<void(Glib::RefPtr<Gdk::Pixbuf> const&)> const& pixbuf_ready_func)
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{
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auto pixbuf = favicon_load_from_cache(host);
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if (pixbuf != nullptr)
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{
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pixbuf_ready_func(pixbuf);
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}
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else
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{
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auto data = std::make_unique<favicon_data>();
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data->session = session;
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data->func = pixbuf_ready_func;
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data->host = host;
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tr_sessionFetch(session, { get_url(host, 0).raw(), favicon_web_done_cb, data.release() });
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}
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}
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void gtr_get_favicon_from_url(
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tr_session* session,
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Glib::ustring const& url,
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std::function<void(Glib::RefPtr<Gdk::Pixbuf> const&)> const& pixbuf_ready_func)
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{
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auto const host = std::string{ tr_urlParse(url.c_str())->host };
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gtr_get_favicon(session, host, pixbuf_ready_func);
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}
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