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// SPDX-License-Identifier: GPL-2.0-or-later
/** @file
* TODO: insert short description here
*//*
* Authors: see git history
*
* Copyright (C) 2018 Authors
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include <glibmm/convert.h>
#include <glibmm/miscutils.h>
#include <glibmm/uriutils.h>
#include "../document.h" /* Unfortunately there's a separate xml/document.h. */
#include "streq.h"
#include "io/dir-util.h"
#include "io/sys.h"
#include "object/sp-object.h"
#include "object/uri.h"
#include "xml/node.h"
#include "xml/rebase-hrefs.h"
using Inkscape::XML::AttributeRecord;
/**
* Determine if a href needs rebasing.
*/
static bool href_needs_rebasing(std::string const &href)
{
bool ret = true;
if ( href.empty() || (href[0] == '#') ) {
ret = false;
/* False (no change) is the right behaviour even when the base URI differs from the
* document URI: RFC 3986 defines empty string relative URL as referring to the containing
* document, rather than referring to the base URI. */
} else {
/* Don't change data or http hrefs. */
std::string scheme = Glib::uri_parse_scheme(href);
if ( !scheme.empty() ) {
/* Assume it shouldn't be changed. This is probably wrong if the scheme is `file'
* (or if the scheme of the new base is non-file, though I believe that never
* happens at the time of writing), but that's rare, and we won't try too hard to
* handle this now: wait until after the freeze, then add liburiparser (or similar)
* as a dependency and do it properly. For now we'll just try to be simple (while
* at least still correctly handling data hrefs). */
ret = false;
}
}
return ret;
}
Inkscape::Util::List<AttributeRecord const>
Inkscape::XML::rebase_href_attrs(gchar const *const old_abs_base,
gchar const *const new_abs_base,
Inkscape::Util::List<AttributeRecord const> attributes)
{
using Inkscape::Util::List;
using Inkscape::Util::cons;
using Inkscape::Util::ptr_shared;
using Inkscape::Util::share_string;
if (old_abs_base == new_abs_base) {
return attributes;
}
GQuark const href_key = g_quark_from_static_string("xlink:href");
GQuark const absref_key = g_quark_from_static_string("sodipodi:absref");
/* First search attributes for xlink:href and sodipodi:absref, putting the rest in ret.
*
* However, if we find that xlink:href doesn't need rebasing, then return immediately
* with no change to attributes. */
ptr_shared old_href;
ptr_shared sp_absref;
List<AttributeRecord const> ret;
{
for (List<AttributeRecord const> ai(attributes); ai; ++ai) {
if (ai->key == href_key) {
old_href = ai->value;
if (!href_needs_rebasing(static_cast<char const *>(old_href))) {
return attributes;
}
} else if (ai->key == absref_key) {
sp_absref = ai->value;
} else {
ret = cons(AttributeRecord(ai->key, ai->value), ret);
}
}
}
if (!old_href) {
return attributes;
/* We could instead return ret in this case, i.e. ensure that sodipodi:absref is cleared if
* no xlink:href attribute. However, retaining it might be more cautious.
*
* (For the usual case of not present, attributes and ret will be the same except
* reversed.) */
}
auto uri = URI::from_href_and_basedir(static_cast<char const *>(old_href), old_abs_base);
auto abs_href = uri.toNativeFilename();
if (!Inkscape::IO::file_test(abs_href.c_str(), G_FILE_TEST_EXISTS) &&
Inkscape::IO::file_test(sp_absref, G_FILE_TEST_EXISTS)) {
uri = URI::from_native_filename(sp_absref);
}
std::string baseuri;
if (new_abs_base && new_abs_base[0]) {
baseuri = URI::from_dirname(new_abs_base).str();
}
auto new_href = uri.str(baseuri.c_str());
ret = cons(AttributeRecord(href_key, share_string(new_href.c_str())), ret); // Check if this is safe/copied or if it is only held.
if (sp_absref) {
/* We assume that if there wasn't previously a sodipodi:absref attribute
* then we shouldn't create one. */
ret = cons(AttributeRecord(absref_key, ( streq(abs_href.c_str(), sp_absref)
? sp_absref
: share_string(abs_href.c_str()) )),
ret);
}
return ret;
}
void Inkscape::XML::rebase_hrefs(SPDocument *const doc, gchar const *const new_base, bool const spns)
{
using Inkscape::URI;
std::string old_base_url_str = URI::from_dirname(doc->getDocumentBase()).str();
std::string new_base_url_str;
if (new_base) {
new_base_url_str = URI::from_dirname(new_base).str();
}
/* TODO: Should handle not just image but also:
*
* a, altGlyph, animElementAttrs, animate, animateColor, animateMotion, animateTransform,
* animation, audio, color-profile, cursor, definition-src, discard, feImage, filter,
* font-face-uri, foreignObject, glyphRef, handler, linearGradient, mpath, pattern,
* prefetch, radialGradient, script, set, textPath, tref, use, video
*
* (taken from the union of the xlink:href elements listed at
* http://www.w3.org/TR/SVG11/attindex.html and
* http://www.w3.org/TR/SVGMobile12/attributeTable.html).
*
* Also possibly some other attributes of type <URI> or <IRI> or list-thereof, or types like
* <paint> that can include an IRI/URI, and stylesheets and style attributes. (xlink:base is a
* special case. xlink:role and xlink:arcrole can be assumed to be already absolute, based on
* http://www.w3.org/TR/SVG11/struct.html#xlinkRefAttrs .)
*
* Note that it may not useful to set sodipodi:absref for anything other than image.
*
* Note also that Inkscape only supports fragment hrefs (href="#pattern257") for many of these
* cases. */
std::vector<SPObject *> images = doc->getResourceList("image");
for (auto image : images) {
Inkscape::XML::Node *ir = image->getRepr();
auto href_cstr = ir->attribute("xlink:href");
if (!href_cstr) {
continue;
}
// skip fragment URLs
if (href_cstr[0] == '#') {
continue;
}
// make absolute
URI url;
try {
url = URI(href_cstr, old_base_url_str.c_str());
} catch (...) {
continue;
}
// skip non-file URLs
if (!url.hasScheme("file")) {
continue;
}
// if path doesn't exist, use sodipodi:absref
if (!g_file_test(url.toNativeFilename().c_str(), G_FILE_TEST_EXISTS)) {
auto spabsref = ir->attribute("sodipodi:absref");
if (spabsref && g_file_test(spabsref, G_FILE_TEST_EXISTS)) {
url = URI::from_native_filename(spabsref);
}
} else if (spns) {
ir->setAttributeOrRemoveIfEmpty("sodipodi:absref", url.toNativeFilename());
}
if (!spns) {
ir->removeAttribute("sodipodi:absref");
}
auto href_str = url.str(new_base_url_str.c_str());
href_str = Inkscape::uri_to_iri(href_str.c_str());
ir->setAttribute("xlink:href", href_str);
}
doc->setDocumentBase(new_base);
}
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vi: set autoindent shiftwidth=4 tabstop=8 filetype=cpp expandtab softtabstop=4 fileencoding=utf-8 textwidth=99 :
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