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/*
Copyright (c) 2017 Christian Mollekopf <mollekopf@kolabsys.com>
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
This library 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 Library General Public
License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
*/
#include "htmlutils.h"
#include <QTextDocument>
static QString resolveEntities(const QString &in)
{
QString out;
for(int i = 0; i < (int)in.length(); ++i) {
if(in[i] == '&') {
// find a semicolon
++i;
int n = in.indexOf(';', i);
if(n == -1)
break;
QString type = in.mid(i, (n-i));
i = n; // should be n+1, but we'll let the loop increment do it
if(type == "amp")
out += '&';
else if(type == "lt")
out += '<';
else if(type == "gt")
out += '>';
else if(type == "quot")
out += '\"';
else if(type == "apos")
out += '\'';
else if(type == "nbsp")
out += 0xa0;
} else {
out += in[i];
}
}
return out;
}
static bool linkify_pmatch(const QString &str1, int at, const QString &str2)
{
if(str2.length() > (str1.length()-at))
return false;
for(int n = 0; n < (int)str2.length(); ++n) {
if(str1.at(n+at).toLower() != str2.at(n).toLower())
return false;
}
return true;
}
static bool linkify_isOneOf(const QChar &c, const QString &charlist)
{
for(int i = 0; i < (int)charlist.length(); ++i) {
if(c == charlist.at(i))
return true;
}
return false;
}
// encodes a few dangerous html characters
static QString linkify_htmlsafe(const QString &in)
{
QString out;
for(int n = 0; n < in.length(); ++n) {
if(linkify_isOneOf(in.at(n), "\"\'`<>")) {
// hex encode
QString hex;
hex.sprintf("%%%02X", in.at(n).toLatin1());
out.append(hex);
} else {
out.append(in.at(n));
}
}
return out;
}
static bool linkify_okUrl(const QString &url)
{
if(url.at(url.length()-1) == '.')
return false;
return true;
}
static bool linkify_okEmail(const QString &addy)
{
// this makes sure that there is an '@' and a '.' after it, and that there is
// at least one char for each of the three sections
int n = addy.indexOf('@');
if(n == -1 || n == 0)
return false;
int d = addy.indexOf('.', n+1);
if(d == -1 || d == 0)
return false;
if((addy.length()-1) - d <= 0)
return false;
if(addy.indexOf("..") != -1)
return false;
return true;
}
/**
* takes a richtext string and heuristically adds links for uris of common protocols
* @return a richtext string with link markup added
*/
QString HtmlUtils::linkify(const QString &in)
{
QString out = in;
int x1, x2;
bool isUrl, isAtStyle;
QString linked, link, href;
for(int n = 0; n < (int)out.length(); ++n) {
isUrl = false;
isAtStyle = false;
x1 = n;
if(linkify_pmatch(out, n, "xmpp:")) {
n += 5;
isUrl = true;
href = "";
}
else if(linkify_pmatch(out, n, "mailto:")) {
n += 7;
isUrl = true;
href = "";
}
else if(linkify_pmatch(out, n, "http://")) {
n += 7;
isUrl = true;
href = "";
}
else if(linkify_pmatch(out, n, "https://")) {
n += 8;
isUrl = true;
href = "";
}
else if(linkify_pmatch(out, n, "ftp://")) {
n += 6;
isUrl = true;
href = "";
}
else if(linkify_pmatch(out, n, "news://")) {
n += 7;
isUrl = true;
href = "";
}
else if (linkify_pmatch(out, n, "ed2k://")) {
n += 7;
isUrl = true;
href = "";
}
else if (linkify_pmatch(out, n, "magnet:")) {
n += 7;
isUrl = true;
href = "";
}
else if(linkify_pmatch(out, n, "www.")) {
isUrl = true;
href = "http://";
}
else if(linkify_pmatch(out, n, "ftp.")) {
isUrl = true;
href = "ftp://";
}
else if(linkify_pmatch(out, n, "@")) {
isAtStyle = true;
href = "x-psi-atstyle:";
}
if(isUrl) {
// make sure the previous char is not alphanumeric
if(x1 > 0 && out.at(x1-1).isLetterOrNumber())
continue;
// find whitespace (or end)
QMap<QChar, int> brackets;
brackets['('] = brackets[')'] = brackets['['] = brackets[']'] = brackets['{'] = brackets['}'] = 0;
QMap<QChar, QChar> openingBracket;
openingBracket[')'] = '(';
openingBracket[']'] = '[';
openingBracket['}'] = '{';
for(x2 = n; x2 < (int)out.length(); ++x2) {
if(out.at(x2).isSpace() || linkify_isOneOf(out.at(x2), "\"\'`<>")
|| linkify_pmatch(out, x2, """) || linkify_pmatch(out, x2, "'")
|| linkify_pmatch(out, x2, ">") || linkify_pmatch(out, x2, "<") ) {
break;
}
if(brackets.keys().contains(out.at(x2))) {
++brackets[out.at(x2)];
}
}
int len = x2-x1;
QString pre = resolveEntities(out.mid(x1, x2-x1));
// go backward hacking off unwanted punctuation
int cutoff;
for(cutoff = pre.length()-1; cutoff >= 0; --cutoff) {
if(!linkify_isOneOf(pre.at(cutoff), "!?,.()[]{}<>\""))
break;
if(linkify_isOneOf(pre.at(cutoff), ")]}")
&& brackets[pre.at(cutoff)] - brackets[openingBracket[pre.at(cutoff)]] <= 0 ) {
break; // in theory, there could be == above, but these are urls, not math ;)
}
if(brackets.keys().contains(pre.at(cutoff))) {
--brackets[pre.at(cutoff)];
}
}
++cutoff;
//++x2;
link = pre.mid(0, cutoff);
if(!linkify_okUrl(link)) {
n = x1 + link.length();
continue;
}
href += link;
// attributes need to be encoded too.
href = href.toHtmlEscaped();
href = linkify_htmlsafe(href);
//printf("link: [%s], href=[%s]\n", link.latin1(), href.latin1());
linked = QString("<a href=\"%1\">").arg(href) + link.toHtmlEscaped() + "</a>" + pre.mid(cutoff).toHtmlEscaped();
out.replace(x1, len, linked);
n = x1 + linked.length() - 1;
} else if(isAtStyle) {
// go backward till we find the beginning
if(x1 == 0)
continue;
--x1;
for(; x1 >= 0; --x1) {
if(!linkify_isOneOf(out.at(x1), "_.-+") && !out.at(x1).isLetterOrNumber())
break;
}
++x1;
// go forward till we find the end
x2 = n + 1;
for(; x2 < (int)out.length(); ++x2) {
if(!linkify_isOneOf(out.at(x2), "_.-+") && !out.at(x2).isLetterOrNumber())
break;
}
int len = x2-x1;
link = out.mid(x1, len);
//link = resolveEntities(link);
if(!linkify_okEmail(link)) {
n = x1 + link.length();
continue;
}
href += link;
//printf("link: [%s], href=[%s]\n", link.latin1(), href.latin1());
linked = QString("<a href=\"%1\">").arg(href) + link + "</a>";
out.replace(x1, len, linked);
n = x1 + linked.length() - 1;
}
}
return out;
}
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