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#include "common.hh"
#include "pathutil.hh"
#include "strutil.hh"
#include "transport.hh"
#include <utility>
namespace {
class NoContentInput : public Transport::Input {
public:
Return fill(Buffer*, size_t) override {
return Return::END;
}
void wait_once(std::shared_ptr<Looper>, std::function<void()> callback)
override {
assert(false);
callback();
}
};
class NoContentResponse : public Transport::Response {
public:
explicit NoContentResponse(std::unique_ptr<Transport::Response> response)
: response_(std::move(response)) {
}
uint16_t code() const override {
return response_->code();
}
std::vector<std::pair<std::string, std::string>> const&
headers() const override {
return response_->headers();
}
std::unique_ptr<Transport::Input> open_content() override {
return std::make_unique<NoContentInput>();
}
void add_header(std::string name, std::string value) override {
response_->add_header(std::move(name), std::move(value));
}
private:
std::unique_ptr<Transport::Response> response_;
};
void copy_headers(Transport::Response const* src, Transport::Response* dst,
std::string_view name) {
for (auto const& header_pair : src->headers()) {
if (header_pair.first == name) {
dst->add_header(std::string(header_pair.first),
std::string(header_pair.second));
}
}
}
std::optional<std::string_view> get_first_header(
Transport::Response const* resp, std::string_view name) {
for (auto const& header_pair : resp->headers()) {
if (header_pair.first == name) {
return header_pair.second;
}
}
return std::nullopt;
}
class DefaultHandler : public Transport::Handler {
public:
DefaultHandler(std::shared_ptr<Logger> logger, Transport::Handler* handler)
: logger_(logger), handler_(handler) {}
std::unique_ptr<Transport::Response> request(
Transport* transport,
Transport::Request const* request) override {
bool include_content;
if (request->method() == "GET") {
include_content = true;
} else if (request->method() == "HEAD") {
include_content = false;
} else {
return transport->create_data(405, "");
}
auto clean_path = path::cleanup(request->path());
if (clean_path != request->path()) {
auto response = transport->create_redirect(clean_path, false);
return response;
}
auto response = handler_->request(transport, request);
if (!response)
return nullptr;
bool not_modified = false;
{
auto values = request->header_all("if-none-match");
auto etag = get_first_header(response.get(), "ETag");
bool match = false;
for (auto const& value : values) {
if (value == "*") {
match = true;
break;
}
if (!etag)
continue;
if (str::starts_with(value, "W/") || str::starts_with(value, "w/")) {
if (value.compare(2, value.size() - 2, etag.value()) == 0) {
match = true;
break;
}
} else {
if (value == etag.value()) {
match = true;
break;
}
}
}
if (match)
not_modified = true;
}
// TODO: Add If-Modified-Since? Not useful right now tho as we have
// no content that returns Date: headers.
if (not_modified) {
auto new_response = transport->create_data(304, "");
copy_headers(response.get(), new_response.get(), "Cache-Control");
copy_headers(response.get(), new_response.get(), "Content-Location");
copy_headers(response.get(), new_response.get(), "Date");
copy_headers(response.get(), new_response.get(), "ETag");
copy_headers(response.get(), new_response.get(), "Expires");
copy_headers(response.get(), new_response.get(), "Vary");
return new_response;
}
return include_content
? std::move(response)
: std::make_unique<NoContentResponse>(std::move(response));
}
private:
std::shared_ptr<Logger> logger_;
Transport::Handler* const handler_;
};
} // namespace
void Transport::Response::open_content_async(
std::shared_ptr<TaskRunner>,
std::function<void(std::unique_ptr<Transport::Input>)> callback) {
assert(false);
callback(open_content());
}
std::unique_ptr<Transport::Response> Transport::create_ok_data(
std::string data) {
if (data.empty())
return create_data(204, std::move(data));
return create_data(200, std::move(data));
}
std::unique_ptr<Transport::Response> Transport::create_ok_file(
std::filesystem::path path) {
return create_file(200, std::move(path));
}
std::unique_ptr<Transport::Response> Transport::create_ok_exif_thumbnail(
std::filesystem::path path) {
return create_exif_thumbnail(200, std::move(path));
}
std::unique_ptr<Transport::Response> Transport::create_not_found() {
return create_data(404, std::string());
}
std::unique_ptr<Transport::Response> Transport::create_redirect(
std::string location, bool temporary) {
auto ret = create_data(temporary ? 302 : 301, std::string());
ret->add_header("Location", std::move(location));
return ret;
}
std::unique_ptr<Transport::Handler> Transport::create_default_handler(
std::shared_ptr<Logger> logger,
Handler* handler) {
return std::make_unique<DefaultHandler>(logger, handler);
}
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