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libkiwix/src/server/internalServer.cpp

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/*
* Copyright 2019 Matthieu Gautier <mgautier@kymeria.fr>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#include "internalServer.h"
#ifdef __FreeBSD__
#include <netinet/in.h>
#endif
#ifdef _WIN32
# if !defined(__MINGW32__) && (_MSC_VER < 1600)
# include "stdint4win.h"
# endif
# include <winsock2.h>
# include <ws2tcpip.h>
# ifdef __GNUC__
// inet_pton is not declared in mingw, even if the function exists.
extern "C" {
WINSOCK_API_LINKAGE INT WSAAPI inet_pton( INT Family, PCSTR pszAddrString, PVOID pAddrBuf);
}
# endif
typedef UINT64 uint64_t;
typedef UINT16 uint16_t;
#endif
extern "C" {
#include "microhttpd_wrapper.h"
}
#include "tools/otherTools.h"
#include "tools/pathTools.h"
#include "tools/regexTools.h"
#include "tools/stringTools.h"
#include "library.h"
#include "name_mapper.h"
#include "entry.h"
#include "searcher.h"
#include "search_renderer.h"
#include "opds_dumper.h"
#include <zim/uuid.h>
#include <mustache.hpp>
#include <atomic>
#include <string>
#include <vector>
#include <chrono>
#include "kiwixlib-resources.h"
#ifndef _WIN32
# include <arpa/inet.h>
#endif
#include "request_context.h"
#include "response.h"
#define MAX_SEARCH_LEN 140
#define KIWIX_MIN_CONTENT_SIZE_TO_DEFLATE 100
namespace kiwix {
static IdNameMapper defaultNameMapper;
static MHD_Result staticHandlerCallback(void* cls,
struct MHD_Connection* connection,
const char* url,
const char* method,
const char* version,
const char* upload_data,
size_t* upload_data_size,
void** cont_cls);
InternalServer::InternalServer(Library* library,
NameMapper* nameMapper,
std::string addr,
int port,
std::string root,
int nbThreads,
bool verbose,
bool withTaskbar,
bool withLibraryButton,
bool blockExternalLinks) :
m_addr(addr),
m_port(port),
m_root(root),
m_nbThreads(nbThreads),
m_verbose(verbose),
m_withTaskbar(withTaskbar),
m_withLibraryButton(withLibraryButton),
m_blockExternalLinks(blockExternalLinks),
mp_daemon(nullptr),
mp_library(library),
mp_nameMapper(nameMapper ? nameMapper : &defaultNameMapper)
{}
bool InternalServer::start() {
#ifdef _WIN32
int flags = MHD_USE_SELECT_INTERNALLY;
#else
int flags = MHD_USE_POLL_INTERNALLY;
#endif
if (m_verbose.load())
flags |= MHD_USE_DEBUG;
struct sockaddr_in sockAddr;
memset(&sockAddr, 0, sizeof(sockAddr));
sockAddr.sin_family = AF_INET;
sockAddr.sin_port = htons(m_port);
if (m_addr.empty()) {
if (0 != INADDR_ANY)
sockAddr.sin_addr.s_addr = htonl(INADDR_ANY);
} else {
if (inet_pton(AF_INET, m_addr.c_str(), &(sockAddr.sin_addr.s_addr)) == 0) {
std::cerr << "Ip address " << m_addr << " is not a valid ip address" << std::endl;
return false;
}
}
mp_daemon = MHD_start_daemon(flags,
m_port,
NULL,
NULL,
&staticHandlerCallback,
this,
MHD_OPTION_SOCK_ADDR, &sockAddr,
MHD_OPTION_THREAD_POOL_SIZE, m_nbThreads,
MHD_OPTION_END);
if (mp_daemon == nullptr) {
std::cerr << "Unable to instantiate the HTTP daemon. The port " << m_port
<< " is maybe already occupied or need more permissions to be open. "
"Please try as root or with a port number higher or equal to 1024."
<< std::endl;
return false;
}
auto server_start_time = std::chrono::system_clock::now().time_since_epoch();
m_server_id = kiwix::to_string(server_start_time.count());
return true;
}
void InternalServer::stop()
{
MHD_stop_daemon(mp_daemon);
}
static MHD_Result staticHandlerCallback(void* cls,
struct MHD_Connection* connection,
const char* url,
const char* method,
const char* version,
const char* upload_data,
size_t* upload_data_size,
void** cont_cls)
{
InternalServer* _this = static_cast<InternalServer*>(cls);
return _this->handlerCallback(connection,
url,
method,
version,
upload_data,
upload_data_size,
cont_cls);
}
MHD_Result InternalServer::handlerCallback(struct MHD_Connection* connection,
const char* url,
const char* method,
const char* version,
const char* upload_data,
size_t* upload_data_size,
void** cont_cls)
{
auto start_time = std::chrono::steady_clock::now();
if (m_verbose.load() ) {
printf("======================\n");
printf("Requesting : \n");
printf("full_url : %s\n", url);
}
RequestContext request(connection, m_root, url, method, version);
if (m_verbose.load() ) {
request.print_debug_info();
}
/* Unexpected method */
if (request.get_method() != RequestMethod::GET
&& request.get_method() != RequestMethod::POST
&& request.get_method() != RequestMethod::HEAD) {
printf("Reject request because of unhandled request method.\n");
printf("----------------------\n");
return MHD_NO;
}
auto response = handle_request(request);
if (response->getReturnCode() == MHD_HTTP_INTERNAL_SERVER_ERROR) {
printf("========== INTERNAL ERROR !! ============\n");
if (!m_verbose.load()) {
printf("Requesting : \n");
printf("full_url : %s\n", url);
request.print_debug_info();
}
}
if (response->getReturnCode() == MHD_HTTP_OK && !etag_not_needed(request))
response->set_server_id(m_server_id);
auto ret = response->send(request, connection);
auto end_time = std::chrono::steady_clock::now();
auto time_span = std::chrono::duration_cast<std::chrono::duration<double>>(end_time - start_time);
if (m_verbose.load()) {
printf("Request time : %fs\n", time_span.count());
printf("----------------------\n");
}
return ret;
}
std::unique_ptr<Response> InternalServer::handle_request(const RequestContext& request)
{
try {
if (! request.is_valid_url())
return Response::build_404(*this, request, "");
const ETag etag = get_matching_if_none_match_etag(request);
if ( etag )
return Response::build_304(*this, etag);
if (kiwix::startsWith(request.get_url(), "/skin/"))
return handle_skin(request);
if (startsWith(request.get_url(), "/catalog"))
return handle_catalog(request);
if (request.get_url() == "/meta")
return handle_meta(request);
if (request.get_url() == "/search")
return handle_search(request);
if (request.get_url() == "/suggest")
return handle_suggest(request);
if (request.get_url() == "/random")
return handle_random(request);
if (request.get_url() == "/catch/external")
return handle_captured_external(request);
return handle_content(request);
} catch (std::exception& e) {
fprintf(stderr, "===== Unhandled error : %s\n", e.what());
return Response::build_500(*this, e.what());
} catch (...) {
fprintf(stderr, "===== Unhandled unknown error\n");
return Response::build_500(*this, "Unknown error");
}
}
MustacheData InternalServer::get_default_data() const
{
MustacheData data;
data.set("root", m_root);
return data;
}
MustacheData InternalServer::homepage_data() const
{
auto data = get_default_data();
MustacheData books{MustacheData::type::list};
for (auto& bookId: mp_library->filter(kiwix::Filter().local(true).valid(true))) {
auto& currentBook = mp_library->getBookById(bookId);
MustacheData book;
book.set("name", mp_nameMapper->getNameForId(bookId));
book.set("title", currentBook.getTitle());
book.set("description", currentBook.getDescription());
book.set("articleCount", beautifyInteger(currentBook.getArticleCount()));
book.set("mediaCount", beautifyInteger(currentBook.getMediaCount()));
books.push_back(book);
}
data.set("books", books);
return data;
}
bool InternalServer::etag_not_needed(const RequestContext& request) const
{
const std::string url = request.get_url();
return kiwix::startsWith(url, "/catalog")
|| url == "/search"
|| url == "/suggest"
|| url == "/random"
|| url == "/catch/external";
}
ETag
InternalServer::get_matching_if_none_match_etag(const RequestContext& r) const
{
try {
const std::string etag_list = r.get_header(MHD_HTTP_HEADER_IF_NONE_MATCH);
return ETag::match(etag_list, m_server_id);
} catch (const std::out_of_range&) {
return ETag();
}
}
std::unique_ptr<Response> InternalServer::build_homepage(const RequestContext& request)
{
return ContentResponse::build(*this, RESOURCE::templates::index_html, homepage_data(), "text/html; charset=utf-8");
}
std::unique_ptr<Response> InternalServer::handle_meta(const RequestContext& request)
{
std::string bookName;
std::string bookId;
std::string meta_name;
std::shared_ptr<Reader> reader;
try {
bookName = request.get_argument("content");
bookId = mp_nameMapper->getIdForName(bookName);
meta_name = request.get_argument("name");
reader = mp_library->getReaderById(bookId);
} catch (const std::out_of_range& e) {
return Response::build_404(*this, request, bookName);
}
if (reader == nullptr) {
return Response::build_404(*this, request, bookName);
}
std::string content;
std::string mimeType = "text";
if (meta_name == "title") {
content = reader->getTitle();
} else if (meta_name == "description") {
content = reader->getDescription();
} else if (meta_name == "language") {
content = reader->getLanguage();
} else if (meta_name == "name") {
content = reader->getName();
} else if (meta_name == "tags") {
content = reader->getTags();
} else if (meta_name == "date") {
content = reader->getDate();
} else if (meta_name == "creator") {
content = reader->getCreator();
} else if (meta_name == "publisher") {
content = reader->getPublisher();
} else if (meta_name == "favicon") {
reader->getFavicon(content, mimeType);
} else {
return Response::build_404(*this, request, bookName);
}
auto response = ContentResponse::build(*this, content, mimeType);
response->set_cacheable();
return std::move(response);
}
std::unique_ptr<Response> InternalServer::handle_suggest(const RequestContext& request)
{
if (m_verbose.load()) {
printf("** running handle_suggest\n");
}
std::string content;
std::string mimeType;
unsigned int maxSuggestionCount = 10;
unsigned int suggestionCount = 0;
std::string bookName;
std::string bookId;
std::string term;
std::shared_ptr<Reader> reader;
try {
bookName = request.get_argument("content");
bookId = mp_nameMapper->getIdForName(bookName);
term = request.get_argument("term");
reader = mp_library->getReaderById(bookId);
} catch (const std::out_of_range&) {
return Response::build_404(*this, request, bookName);
}
if (m_verbose.load()) {
printf("Searching suggestions for: \"%s\"\n", term.c_str());
}
MustacheData results{MustacheData::type::list};
bool first = true;
if (reader != nullptr) {
/* Get the suggestions */
SuggestionsList_t suggestions;
reader->searchSuggestionsSmart(term, maxSuggestionCount, suggestions);
for(auto& suggestion:suggestions) {
MustacheData result;
result.set("label", suggestion[0]);
result.set("value", suggestion[0]);
result.set("first", first);
first = false;
results.push_back(result);
suggestionCount++;
}
}
/* Propose the fulltext search if possible */
if (reader->hasFulltextIndex()) {
MustacheData result;
result.set("label", "containing '" + term + "'...");
result.set("value", term + " ");
result.set("first", first);
results.push_back(result);
}
auto data = get_default_data();
data.set("suggestions", results);
auto response = ContentResponse::build(*this, RESOURCE::templates::suggestion_json, data, "application/json; charset=utf-8");
return std::move(response);
}
std::unique_ptr<Response> InternalServer::handle_skin(const RequestContext& request)
{
if (m_verbose.load()) {
printf("** running handle_skin\n");
}
auto resourceName = request.get_url().substr(1);
try {
auto response = ContentResponse::build(
*this,
getResource(resourceName),
getMimeTypeForFile(resourceName));
response->set_cacheable();
return std::move(response);
} catch (const ResourceNotFound& e) {
return Response::build_404(*this, request, "");
}
}
std::unique_ptr<Response> InternalServer::handle_search(const RequestContext& request)
{
if (m_verbose.load()) {
printf("** running handle_search\n");
}
std::string bookName;
std::string bookId;
try {
bookName = request.get_argument("content");
bookId = mp_nameMapper->getIdForName(bookName);
} catch (const std::out_of_range&) {}
std::string patternString;
try {
patternString = request.get_argument("pattern");
} catch (const std::out_of_range&) {}
/* Retrive geo search */
bool has_geo_query = false;
float latitude = 0;
float longitude = 0;
float distance = 0;
try {
latitude = request.get_argument<float>("latitude");
longitude = request.get_argument<float>("longitude");
distance = request.get_argument<float>("distance");
has_geo_query = true;
} catch(const std::out_of_range&) {}
catch(const std::invalid_argument&) {}
std::shared_ptr<Reader> reader(nullptr);
try {
reader = mp_library->getReaderById(bookId);
} catch (const std::out_of_range&) {}
/* Try first to load directly the article */
if (reader != nullptr && !patternString.empty()) {
std::string patternCorrespondingUrl;
auto variants = reader->getTitleVariants(patternString);
auto variantsItr = variants.begin();
while (patternCorrespondingUrl.empty() && variantsItr != variants.end()) {
try {
auto entry = reader->getEntryFromTitle(*variantsItr);
entry = entry.getFinalEntry();
patternCorrespondingUrl = entry.getPath();
break;
} catch(kiwix::NoEntry& e) {
variantsItr++;
}
}
/* If article found then redirect directly to it */
if (!patternCorrespondingUrl.empty()) {
auto redirectUrl = m_root + "/" + bookName + "/" + patternCorrespondingUrl;
return Response::build_redirect(*this, redirectUrl);
}
}
/* Make the search */
if ( (!reader && !bookName.empty())
|| (patternString.empty() && ! has_geo_query) ) {
auto data = get_default_data();
data.set("pattern", encodeDiples(patternString));
auto response = ContentResponse::build(*this, RESOURCE::templates::no_search_result_html, data, "text/html; charset=utf-8");
response->set_taskbar(bookName, reader ? reader->getTitle() : "");
response->set_code(MHD_HTTP_NOT_FOUND);
return std::move(response);
}
Searcher searcher;
if (reader) {
searcher.add_reader(reader.get());
} else {
for (auto& bookId: mp_library->filter(kiwix::Filter().local(true).valid(true))) {
auto currentReader = mp_library->getReaderById(bookId);
if (currentReader) {
searcher.add_reader(currentReader.get());
}
}
}
auto start = 0;
try {
start = request.get_argument<unsigned int>("start");
} catch (const std::exception&) {}
auto pageLength = 25;
try {
pageLength = request.get_argument<unsigned int>("pageLength");
} catch (const std::exception&) {}
if (pageLength > MAX_SEARCH_LEN) {
pageLength = MAX_SEARCH_LEN;
}
if (pageLength == 0) {
pageLength = 25;
}
auto end = start + pageLength;
/* Get the results */
try {
if (patternString.empty()) {
searcher.geo_search(latitude, longitude, distance,
start, end, m_verbose.load());
} else {
searcher.search(patternString,
start, end, m_verbose.load());
}
SearchRenderer renderer(&searcher, mp_nameMapper);
renderer.setSearchPattern(patternString);
renderer.setSearchContent(bookName);
renderer.setProtocolPrefix(m_root + "/");
renderer.setSearchProtocolPrefix(m_root + "/search?");
renderer.setPageLength(pageLength);
auto response = ContentResponse::build(*this, renderer.getHtml(), "text/html; charset=utf-8");
response->set_taskbar(bookName, reader ? reader->getTitle() : "");
//changing status code if no result obtained
if(searcher.getEstimatedResultCount() == 0)
{
response->set_code(MHD_HTTP_NO_CONTENT);
}
return std::move(response);
} catch (const std::exception& e) {
std::cerr << e.what() << std::endl;
return Response::build_500(*this, e.what());
}
}
std::unique_ptr<Response> InternalServer::handle_random(const RequestContext& request)
{
if (m_verbose.load()) {
printf("** running handle_random\n");
}
std::string bookName;
std::string bookId;
std::shared_ptr<Reader> reader;
try {
bookName = request.get_argument("content");
bookId = mp_nameMapper->getIdForName(bookName);
reader = mp_library->getReaderById(bookId);
} catch (const std::out_of_range&) {
return Response::build_404(*this, request, bookName);
}
if (reader == nullptr) {
return Response::build_404(*this, request, bookName);
}
try {
auto entry = reader->getRandomPage();
return build_redirect(bookName, entry.getFinalEntry());
} catch(kiwix::NoEntry& e) {
return Response::build_404(*this, request, bookName);
}
}
std::unique_ptr<Response> InternalServer::handle_captured_external(const RequestContext& request)
{
std::string source = "";
try {
source = kiwix::urlDecode(request.get_argument("source"));
} catch (const std::out_of_range& e) {}
if (source.empty())
return Response::build_404(*this, request, "");
auto data = get_default_data();
data.set("source", source);
return ContentResponse::build(*this, RESOURCE::templates::captured_external_html, data, "text/html; charset=utf-8");
}
std::unique_ptr<Response> InternalServer::handle_catalog(const RequestContext& request)
{
if (m_verbose.load()) {
printf("** running handle_catalog");
}
std::string host;
std::string url;
try {
host = request.get_header("Host");
url = request.get_url_part(1);
} catch (const std::out_of_range&) {
return Response::build_404(*this, request, "");
}
if (url != "searchdescription.xml" && url != "root.xml" && url != "search") {
return Response::build_404(*this, request, "");
}
if (url == "searchdescription.xml") {
auto response = ContentResponse::build(*this, RESOURCE::opensearchdescription_xml, get_default_data(), "application/opensearchdescription+xml");
return std::move(response);
}
zim::Uuid uuid;
kiwix::OPDSDumper opdsDumper;
opdsDumper.setRootLocation(m_root);
opdsDumper.setSearchDescriptionUrl("catalog/searchdescription.xml");
opdsDumper.setLibrary(mp_library);
std::vector<std::string> bookIdsToDump;
if (url == "root.xml") {
opdsDumper.setTitle("All zims");
uuid = zim::Uuid::generate(host);
bookIdsToDump = mp_library->filter(kiwix::Filter().valid(true).local(true).remote(true));
} else if (url == "search") {
bookIdsToDump = search_catalog(request, opdsDumper);
uuid = zim::Uuid::generate();
}
opdsDumper.setId(kiwix::to_string(uuid));
auto response = ContentResponse::build(
*this,
opdsDumper.dumpOPDSFeed(bookIdsToDump),
"application/atom+xml; profile=opds-catalog; kind=acquisition; charset=utf-8");
return std::move(response);
}
std::vector<std::string>
InternalServer::search_catalog(const RequestContext& request,
kiwix::OPDSDumper& opdsDumper)
{
auto filter = kiwix::Filter().valid(true).local(true).remote(true);
string query("<Empty query>");
size_t count(10);
size_t startIndex(0);
try {
query = request.get_argument("q");
filter.query(query);
} catch (const std::out_of_range&) {}
try {
filter.maxSize(extractFromString<unsigned long>(request.get_argument("maxsize")));
} catch (...) {}
try {
filter.name(request.get_argument("name"));
} catch (const std::out_of_range&) {}
try {
filter.category(request.get_argument("category"));
} catch (const std::out_of_range&) {}
try {
filter.lang(request.get_argument("lang"));
} catch (const std::out_of_range&) {}
try {
count = extractFromString<unsigned long>(request.get_argument("count"));
} catch (...) {}
try {
startIndex = extractFromString<unsigned long>(request.get_argument("start"));
} catch (...) {}
try {
filter.acceptTags(kiwix::split(request.get_argument("tag"), ";"));
} catch (...) {}
try {
filter.rejectTags(kiwix::split(request.get_argument("notag"), ";"));
} catch (...) {}
opdsDumper.setTitle("Search result for " + query);
std::vector<std::string> bookIdsToDump = mp_library->filter(filter);
auto totalResults = bookIdsToDump.size();
bookIdsToDump.erase(bookIdsToDump.begin(), bookIdsToDump.begin()+startIndex);
if (count>0 && bookIdsToDump.size() > count) {
bookIdsToDump.resize(count);
}
opdsDumper.setOpenSearchInfo(totalResults, startIndex, bookIdsToDump.size());
return bookIdsToDump;
}
namespace
{
std::string get_book_name(const RequestContext& request)
{
try {
return request.get_url_part(0);
} catch (const std::out_of_range& e) {
return std::string();
}
}
} // unnamed namespace
std::shared_ptr<Reader>
InternalServer::get_reader(const std::string& bookName) const
{
std::shared_ptr<Reader> reader;
try {
const std::string bookId = mp_nameMapper->getIdForName(bookName);
reader = mp_library->getReaderById(bookId);
} catch (const std::out_of_range& e) {
}
return reader;
}
std::unique_ptr<Response>
InternalServer::build_redirect(const std::string& bookName, const kiwix::Entry& entry) const
{
auto redirectUrl = m_root + "/" + bookName + "/" + kiwix::urlEncode(entry.getPath());
return Response::build_redirect(*this, redirectUrl);
}
std::unique_ptr<Response> InternalServer::handle_content(const RequestContext& request)
{
if (m_verbose.load()) {
printf("** running handle_content\n");
}
const std::string bookName = get_book_name(request);
if (bookName.empty())
return build_homepage(request);
const std::shared_ptr<Reader> reader = get_reader(bookName);
if (reader == nullptr) {
return Response::build_404(*this, request, bookName);
}
auto urlStr = request.get_url().substr(bookName.size()+1);
if (urlStr[0] == '/') {
urlStr = urlStr.substr(1);
}
try {
auto entry = reader->getEntryFromPath(urlStr);
if (entry.isRedirect() || urlStr.empty()) {
// If urlStr is empty, we want to mainPage.
// We must do a redirection to the real page.
return build_redirect(bookName, entry.getFinalEntry());
}
auto response = ItemResponse::build(*this, request, entry.getZimEntry().getItem());
try {
dynamic_cast<ContentResponse&>(*response).set_taskbar(bookName, reader->getTitle());
} catch (std::bad_cast& e) {}
if (m_verbose.load()) {
printf("Found %s\n", entry.getPath().c_str());
printf("mimeType: %s\n", entry.getMimetype().c_str());
}
return response;
} catch(kiwix::NoEntry& e) {
if (m_verbose.load())
printf("Failed to find %s\n", urlStr.c_str());
return Response::build_404(*this, request, bookName);
}
}
}
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