512 lines
14 KiB
C++
512 lines
14 KiB
C++
/* This file is part of remwharead.
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* Copyright © 2019 tastytea <tastytea@tastytea.de>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <sstream>
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#include <cstdint>
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#include <iostream>
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#include <regex>
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#include <locale>
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#include <codecvt>
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#include <curlpp/cURLpp.hpp>
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#include <curlpp/Options.hpp>
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#include <curlpp/Exception.hpp>
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#include <curlpp/Infos.hpp>
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#include <version.hpp>
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#include "uri.hpp"
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namespace curlopts = curlpp::options;
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using std::uint64_t;
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using std::cerr;
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using std::endl;
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using std::regex;
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using std::regex_replace;
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using std::regex_search;
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using std::smatch;
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URI::URI(const string &uri)
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:_uri(uri)
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{
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}
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const html_extract URI::get()
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{
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try
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{
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std::ostringstream oss;
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curlpp::Easy request;
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set_curlpp_options(request);
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request.setOpt<curlopts::Url>(_uri);
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request.setOpt<curlopts::WriteStream>(&oss);
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request.perform();
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const string answer = oss.str();
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if (answer.empty())
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{
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cerr << "Error: Could not download page. Response code: "
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<< curlpp::infos::ResponseCode::get(request) << endl;
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}
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else
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{
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return
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{
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extract_title(answer),
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extract_description(answer),
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strip_html(answer)
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};
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}
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}
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catch (const std::exception &e)
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{
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cerr << "Error in " << __func__ << ": " << e.what() << endl;
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}
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return { "", "", "" };
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}
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void URI::set_curlpp_options(curlpp::Easy &request)
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{
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request.setOpt<curlopts::UserAgent>(string("remwharead/")
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+ global::version);
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request.setOpt<curlopts::HttpHeader>({ "Connection: close" });
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request.setOpt<curlopts::FollowLocation>(true);
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}
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const string URI::extract_title(const string &html)
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{
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const regex re_htmlfile("\\.(.?html?|xml|rss)$");
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if (_uri.substr(0, 4) == "http" || regex_search(_uri, re_htmlfile))
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{
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smatch match;
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regex_search(html, match, regex("<title>([^<]+)"));
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return remove_newlines(match[1].str());
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}
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return "";
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}
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const string URI::extract_description(const string &html)
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{
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const regex re_htmlfile("\\.(.?html?|xml|rss)$");
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if (_uri.substr(0, 4) == "http" || regex_search(_uri, re_htmlfile))
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{
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smatch match;
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regex_search(html, match, regex("description\"[^>]+content=\"([^\"]+)"));
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return remove_newlines(match[1].str());
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}
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return "";
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}
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const string URI::strip_html(const string &html)
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{
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string out;
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out = remove_html_tags(html, "script"); // Remove JavaScript.
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out = remove_html_tags(out, "style"); // Remove CSS.
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out = remove_html_tags(out); // Remove tags.
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size_t pos = 0;
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while ((pos = out.find("\r", pos)) != std::string::npos) // Remove CR.
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{
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out.replace(pos, 1, "");
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}
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out = regex_replace(out, regex("\\s+\n"), "\n"); // Remove trailing space.
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out = regex_replace(out, regex("\n{2,}"), "\n"); // Reduce newlines.
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return unescape_html(out);
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}
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const string URI::remove_html_tags(const string &html, const string &tag)
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{
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// NOTE: I did this with regex_replace before, but libstdc++ segfaulted.
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string out;
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if (tag.empty())
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{
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size_t pos = 0;
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while (pos != std::string::npos)
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{
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size_t startpos = html.find('<', pos);
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size_t endpos = html.find('>', startpos);
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out += html.substr(pos, startpos - pos);
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pos = endpos;
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if (pos != std::string::npos)
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{
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++pos;
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}
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}
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}
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else
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{
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size_t pos = 0;
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out = html;
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while ((pos = out.find("<" + tag)) != std::string::npos)
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{
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size_t endpos = out.find("</" + tag, pos);
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if (endpos == std::string::npos)
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{
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break;
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}
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endpos += 3 + tag.length(); // tag + </ + >
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out.replace(pos, endpos - pos, "");
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}
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}
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return out;
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}
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const string URI::unescape_html(const string &html)
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{
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string buffer = html;
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string output;
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// Used to convert int to utf-8 char.
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std::wstring_convert<std::codecvt_utf8<char32_t>, char32_t> u8c;
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regex re_entity("&#(x)?([[:alnum:]]{1,8});");
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smatch match;
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while (regex_search(buffer, match, re_entity))
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{
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char32_t codepoint = 0;
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// 'x' in front of the number means it's hexadecimal, else decimal.
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if (match[1].length() == 1)
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{
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codepoint = std::stoi(match[2].str(), nullptr, 16);
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}
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else
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{
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codepoint = std::stoi(match[2].str(), nullptr, 10);
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}
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output += match.prefix().str() + u8c.to_bytes(codepoint);
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buffer = match.suffix().str();
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}
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output += buffer;
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// Source: https://en.wikipedia.org/wiki/List_of_XML_and_HTML_character_
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// entity_references#Character_entity_references_in_HTML
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const std::array<const std::pair<const string, const char32_t>, 258> names =
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{{
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{ "exclamation", 0x0021 },
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{ "quot", 0x0022 },
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{ "percent", 0x0025 },
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{ "amp", 0x0026 },
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{ "apos", 0x0027 },
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{ "add", 0x002B },
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{ "lt", 0x003C },
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{ "equal", 0x003D },
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{ "gt", 0x003E },
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{ "nbsp", 0x00A0 },
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{ "iexcl", 0x00A1 },
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{ "cent", 0x00A2 },
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{ "pound", 0x00A3 },
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{ "curren", 0x00A4 },
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{ "yen", 0x00A5 },
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{ "brvbar", 0x00A6 },
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{ "sect", 0x00A7 },
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{ "uml", 0x00A8 },
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{ "copy", 0x00A9 },
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{ "ordf", 0x00AA },
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{ "laquo", 0x00AB },
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{ "not", 0x00AC },
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{ "shy", 0x00AD },
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{ "reg", 0x00AE },
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{ "macr", 0x00AF },
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{ "deg", 0x00B0 },
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{ "plusmn", 0x00B1 },
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{ "sup2", 0x00B2 },
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{ "sup3", 0x00B3 },
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{ "acute", 0x00B4 },
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{ "micro", 0x00B5 },
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{ "para", 0x00B6 },
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{ "middot", 0x00B7 },
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{ "cedil", 0x00B8 },
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{ "sup1", 0x00B9 },
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{ "ordm", 0x00BA },
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{ "raquo", 0x00BB },
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{ "frac14", 0x00BC },
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{ "frac12", 0x00BD },
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{ "frac34", 0x00BE },
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{ "iquest", 0x00BF },
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{ "Agrave", 0x00C0 },
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{ "Aacute", 0x00C1 },
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{ "Acirc", 0x00C2 },
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{ "Atilde", 0x00C3 },
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{ "Auml", 0x00C4 },
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{ "Aring", 0x00C5 },
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{ "AElig", 0x00C6 },
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{ "Ccedil", 0x00C7 },
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{ "Egrave", 0x00C8 },
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{ "Eacute", 0x00C9 },
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{ "Ecirc", 0x00CA },
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{ "Euml", 0x00CB },
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{ "Igrave", 0x00CC },
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{ "Iacute", 0x00CD },
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{ "Icirc", 0x00CE },
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{ "Iuml", 0x00CF },
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{ "ETH", 0x00D0 },
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{ "Ntilde", 0x00D1 },
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{ "Ograve", 0x00D2 },
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{ "Oacute", 0x00D3 },
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{ "Ocirc", 0x00D4 },
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{ "Otilde", 0x00D5 },
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{ "Ouml", 0x00D6 },
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{ "times", 0x00D7 },
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{ "Oslash", 0x00D8 },
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{ "Ugrave", 0x00D9 },
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{ "Uacute", 0x00DA },
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{ "Ucirc", 0x00DB },
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{ "Uuml", 0x00DC },
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{ "Yacute", 0x00DD },
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{ "THORN", 0x00DE },
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{ "szlig", 0x00DF },
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{ "agrave", 0x00E0 },
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{ "aacute", 0x00E1 },
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{ "acirc", 0x00E2 },
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{ "atilde", 0x00E3 },
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{ "auml", 0x00E4 },
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{ "aring", 0x00E5 },
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{ "aelig", 0x00E6 },
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{ "ccedil", 0x00E7 },
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{ "egrave", 0x00E8 },
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{ "eacute", 0x00E9 },
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{ "ecirc", 0x00EA },
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{ "euml", 0x00EB },
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{ "igrave", 0x00EC },
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{ "iacute", 0x00ED },
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{ "icirc", 0x00EE },
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{ "iuml", 0x00EF },
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{ "eth", 0x00F0 },
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{ "ntilde", 0x00F1 },
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{ "ograve", 0x00F2 },
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{ "oacute", 0x00F3 },
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{ "ocirc", 0x00F4 },
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{ "otilde", 0x00F5 },
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{ "ouml", 0x00F6 },
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{ "divide", 0x00F7 },
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{ "oslash", 0x00F8 },
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{ "ugrave", 0x00F9 },
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{ "uacute", 0x00FA },
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{ "ucirc", 0x00FB },
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{ "uuml", 0x00FC },
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{ "yacute", 0x00FD },
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{ "thorn", 0x00FE },
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{ "yuml", 0x00FF },
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{ "OElig", 0x0152 },
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{ "oelig", 0x0153 },
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{ "Scaron", 0x0160 },
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{ "scaron", 0x0161 },
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{ "Yuml", 0x0178 },
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{ "fnof", 0x0192 },
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{ "circ", 0x02C6 },
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{ "tilde", 0x02DC },
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{ "Alpha", 0x0391 },
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{ "Beta", 0x0392 },
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{ "Gamma", 0x0393 },
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{ "Delta", 0x0394 },
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{ "Epsilon", 0x0395 },
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{ "Zeta", 0x0396 },
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{ "Eta", 0x0397 },
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{ "Theta", 0x0398 },
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{ "Iota", 0x0399 },
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{ "Kappa", 0x039A },
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{ "Lambda", 0x039B },
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{ "Mu", 0x039C },
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{ "Nu", 0x039D },
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{ "Xi", 0x039E },
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{ "Omicron", 0x039F },
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{ "Pi", 0x03A0 },
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{ "Rho", 0x03A1 },
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{ "Sigma", 0x03A3 },
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{ "Tau", 0x03A4 },
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{ "Upsilon", 0x03A5 },
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{ "Phi", 0x03A6 },
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{ "Chi", 0x03A7 },
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{ "Psi", 0x03A8 },
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{ "Omega", 0x03A9 },
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{ "alpha", 0x03B1 },
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{ "beta", 0x03B2 },
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{ "gamma", 0x03B3 },
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{ "delta", 0x03B4 },
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{ "epsilon", 0x03B5 },
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{ "zeta", 0x03B6 },
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{ "eta", 0x03B7 },
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{ "theta", 0x03B8 },
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{ "iota", 0x03B9 },
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{ "kappa", 0x03BA },
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{ "lambda", 0x03BB },
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{ "mu", 0x03BC },
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{ "nu", 0x03BD },
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{ "xi", 0x03BE },
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{ "omicron", 0x03BF },
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{ "pi", 0x03C0 },
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{ "rho", 0x03C1 },
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{ "sigmaf", 0x03C2 },
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{ "sigma", 0x03C3 },
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{ "tau", 0x03C4 },
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{ "upsilon", 0x03C5 },
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{ "phi", 0x03C6 },
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{ "chi", 0x03C7 },
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{ "psi", 0x03C8 },
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{ "omega", 0x03C9 },
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{ "thetasym", 0x03D1 },
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{ "upsih", 0x03D2 },
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{ "piv", 0x03D6 },
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{ "ensp", 0x2002 },
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{ "emsp", 0x2003 },
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{ "thinsp", 0x2009 },
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{ "zwnj", 0x200C },
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{ "zwj", 0x200D },
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{ "lrm", 0x200E },
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{ "rlm", 0x200F },
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{ "ndash", 0x2013 },
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{ "mdash", 0x2014 },
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{ "horbar", 0x2015 },
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{ "lsquo", 0x2018 },
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{ "rsquo", 0x2019 },
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{ "sbquo", 0x201A },
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{ "ldquo", 0x201C },
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{ "rdquo", 0x201D },
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{ "bdquo", 0x201E },
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{ "dagger", 0x2020 },
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{ "Dagger", 0x2021 },
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{ "bull", 0x2022 },
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{ "hellip", 0x2026 },
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{ "permil", 0x2030 },
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{ "prime", 0x2032 },
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{ "Prime", 0x2033 },
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{ "lsaquo", 0x2039 },
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{ "rsaquo", 0x203A },
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{ "oline", 0x203E },
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{ "frasl", 0x2044 },
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{ "euro", 0x20AC },
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{ "image", 0x2111 },
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{ "weierp", 0x2118 },
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{ "real", 0x211C },
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{ "trade", 0x2122 },
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{ "alefsym", 0x2135 },
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{ "larr", 0x2190 },
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{ "uarr", 0x2191 },
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{ "rarr", 0x2192 },
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{ "darr", 0x2193 },
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{ "harr", 0x2194 },
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{ "crarr", 0x21B5 },
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{ "lArr", 0x21D0 },
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{ "uArr", 0x21D1 },
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{ "rArr", 0x21D2 },
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{ "dArr", 0x21D3 },
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{ "hArr", 0x21D4 },
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{ "forall", 0x2200 },
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{ "part", 0x2202 },
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{ "exist", 0x2203 },
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{ "empty", 0x2205 },
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{ "nabla", 0x2207 },
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{ "isin", 0x2208 },
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{ "notin", 0x2209 },
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{ "ni", 0x220B },
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{ "prod", 0x220F },
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{ "sum", 0x2211 },
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{ "minus", 0x2212 },
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{ "lowast", 0x2217 },
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{ "radic", 0x221A },
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{ "prop", 0x221D },
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{ "infin", 0x221E },
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{ "ang", 0x2220 },
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{ "and", 0x2227 },
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{ "or", 0x2228 },
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{ "cap", 0x2229 },
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{ "cup", 0x222A },
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{ "int", 0x222B },
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{ "there4", 0x2234 },
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{ "sim", 0x223C },
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{ "cong", 0x2245 },
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{ "asymp", 0x2248 },
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{ "ne", 0x2260 },
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{ "equiv", 0x2261 },
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{ "le", 0x2264 },
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{ "ge", 0x2265 },
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{ "sub", 0x2282 },
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{ "sup", 0x2283 },
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{ "nsub", 0x2284 },
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{ "sube", 0x2286 },
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{ "supe", 0x2287 },
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{ "oplus", 0x2295 },
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{ "otimes", 0x2297 },
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{ "perp", 0x22A5 },
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{ "sdot", 0x22C5 },
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{ "lceil", 0x2308 },
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{ "rceil", 0x2309 },
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{ "lfloor", 0x230A },
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{ "rfloor", 0x230B },
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{ "lang", 0x2329 },
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{ "rang", 0x232A },
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{ "loz", 0x25CA },
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{ "spades", 0x2660 },
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{ "clubs", 0x2663 },
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{ "hearts", 0x2665 },
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{ "diams", 0x2666 }
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}};
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for (auto &pair : names)
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{
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const regex re('&' + pair.first + ';');
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output = regex_replace(output, re, u8c.to_bytes(pair.second));
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}
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return output;
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}
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const string URI::archive()
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{
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if (_uri.substr(0, 4) != "http")
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{
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return "";
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}
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try
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{
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std::ostringstream oss;
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curlpp::Easy request;
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set_curlpp_options(request);
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request.setOpt<curlopts::Url>("https://web.archive.org/save/" + _uri);
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request.setOpt<curlopts::WriteStream>(&oss);
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request.setOpt<curlopts::NoBody>(true); // Make a HEAD request.
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request.setOpt<curlpp::options::Header>(true); // Save headers in oss.
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request.perform();
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smatch match;
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const string answer = oss.str();
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if (regex_search(answer, match, regex("Content-Location: (.+)\r\n")))
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{
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return "https://web.archive.org" + match[1].str();
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}
|
|
else
|
|
{
|
|
cerr << "Error: Could not archive page. HTTP status: "
|
|
<< curlpp::infos::ResponseCode::get(request) << endl;
|
|
}
|
|
}
|
|
catch (const std::exception &e)
|
|
{
|
|
cerr << "Error in " << __func__ << ": " << e.what() << endl;
|
|
}
|
|
|
|
return "";
|
|
}
|
|
|
|
const string URI::remove_newlines(const string &text)
|
|
{
|
|
return regex_replace(text, regex("\n"), " ");
|
|
}
|