diff options
Diffstat (limited to 'src/xml/rebase-hrefs.cpp')
| -rw-r--r-- | src/xml/rebase-hrefs.cpp | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/src/xml/rebase-hrefs.cpp b/src/xml/rebase-hrefs.cpp new file mode 100644 index 0000000..d047280 --- /dev/null +++ b/src/xml/rebase-hrefs.cpp @@ -0,0 +1,197 @@ +// 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 <glibmm/utility.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; +using Inkscape::XML::AttributeVector; + +/** + * Determine if a href needs rebasing. + */ +static bool href_needs_rebasing(char const *href) +{ + // RFC 3986 defines empty string relative URL as referring to the + // containing document, rather than referring to the base URI. + if (!href[0] || href[0] == '#') { + return false; + } + + // skip document-local queries + if (href[0] == '?') { + return false; + } + + // skip absolute-path and network-path references + if (href[0] == '/') { + return false; + } + + // Don't change non-file URIs (like data or http) + auto scheme = Glib::make_unique_ptr_gfree(g_uri_parse_scheme(href)); + return !scheme || streq(scheme.get(), "file"); +} + +AttributeVector +Inkscape::XML::rebase_href_attrs(gchar const *const old_abs_base, + gchar const *const new_abs_base, + const AttributeVector &attributes) +{ + using Inkscape::Util::share_string; + + auto ret = attributes; // copy + + if (old_abs_base == new_abs_base) { + return ret; + } + + static GQuark const href_key = g_quark_from_static_string("xlink:href"); + static GQuark const absref_key = g_quark_from_static_string("sodipodi:absref"); + + auto const find_record = [&ret](GQuark const key) { + return find_if(ret.begin(), ret.end(), [key](auto const &attr) { return attr.key == key; }); + }; + + auto href_it = find_record(href_key); + if (href_it == ret.end() || !href_needs_rebasing(href_it->value.pointer())) { + return ret; + } + + auto uri = URI::from_href_and_basedir(href_it->value.pointer(), old_abs_base); + auto abs_href = uri.toNativeFilename(); + + auto absref_it = find_record(absref_key); + if (absref_it != ret.end()) { + if (g_file_test(abs_href.c_str(), G_FILE_TEST_EXISTS)) { + if (!streq(abs_href.c_str(), absref_it->value.pointer())) { + absref_it->value = share_string(abs_href.c_str()); + } + } else if (g_file_test(absref_it->value.pointer(), G_FILE_TEST_EXISTS)) { + uri = URI::from_native_filename(absref_it->value.pointer()); + } + } + + 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()); + href_it->value = share_string(new_href.c_str()); + + 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; + } + + if (!href_needs_rebasing(href_cstr)) { + 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 : |