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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Loader for external plug-ins.
*
* Authors:
* Moritz Eberl <moritz@semiodesk.com>
*
* Copyright (C) 2016 Authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "loader.h"
#include <gmodule.h>
#include "system.h"
#include <cstring>
#include "dependency.h"
#include "inkscape-version.h"
namespace Inkscape {
namespace Extension {
typedef Implementation::Implementation *(*_getImplementation)();
typedef const gchar *(*_getInkscapeVersion)();
bool Loader::load_dependency(Dependency *dep)
{
GModule *module = nullptr;
module = g_module_open(dep->get_name(), (GModuleFlags)0);
if (module == nullptr) {
return false;
}
return true;
}
/**
* @brief Load the actual implementation of a plugin supplied by the plugin.
* @param doc The xml representation of the INX extension configuration.
* @return The implementation of the extension loaded from the plugin.
*/
Implementation::Implementation *Loader::load_implementation(Inkscape::XML::Document *doc)
{
try {
Inkscape::XML::Node *repr = doc->root();
Inkscape::XML::Node *child_repr = repr->firstChild();
// Iterate over the xml content
while (child_repr != nullptr) {
char const *chname = child_repr->name();
if (!strncmp(chname, INKSCAPE_EXTENSION_NS_NC, strlen(INKSCAPE_EXTENSION_NS_NC))) {
chname += strlen(INKSCAPE_EXTENSION_NS);
}
// Deal with dependencies if we have them
if (!strcmp(chname, "dependency")) {
Dependency dep = Dependency(child_repr, nullptr); // TODO: Why is "this" not an extension?
// try to load it
bool success = load_dependency(&dep);
if( !success ){
// Could not load dependency, we abort
const char *res = g_module_error();
g_warning("Unable to load dependency %s of plugin %s.\nDetails: %s\n", dep.get_name(), "<todo>", res);
return nullptr;
}
}
// Found a plugin to load
if (!strcmp(chname, "plugin")) {
// The name of the plugin is actually the library file we want to load
if (const gchar *name = child_repr->attribute("name")) {
GModule *module = nullptr;
_getImplementation GetImplementation = nullptr;
_getInkscapeVersion GetInkscapeVersion = nullptr;
// build the path where to look for the plugin
gchar *path = g_build_filename(_baseDirectory.c_str(), name, (char *) nullptr);
module = g_module_open(path, G_MODULE_BIND_LOCAL);
g_free(path);
if (module == nullptr) {
// we were not able to load the plugin, write warning and abort
const char *res = g_module_error();
g_warning("Unable to load extension %s.\nDetails: %s\n", name, res);
return nullptr;
}
// Get a handle to the version function of the module
if (g_module_symbol(module, "GetInkscapeVersion", (gpointer *) &GetInkscapeVersion) == FALSE) {
// This didn't work, write warning and abort
const char *res = g_module_error();
g_warning("Unable to load extension %s.\nDetails: %s\n", name, res);
return nullptr;
}
// Get a handle to the function that delivers the implementation
if (g_module_symbol(module, "GetImplementation", (gpointer *) &GetImplementation) == FALSE) {
// This didn't work, write warning and abort
const char *res = g_module_error();
g_warning("Unable to load extension %s.\nDetails: %s\n", name, res);
return nullptr;
}
// Get version and test against this version
const gchar* version = GetInkscapeVersion();
if( strcmp(version, version_string) != 0) {
// The versions are different, display warning.
g_warning("Plugin was built against Inkscape version %s, this is %s. The plugin might not be compatible.", version, version_string);
}
Implementation::Implementation *i = GetImplementation();
return i;
}
}
child_repr = child_repr->next();
}
} catch (std::exception &e) {
g_warning("Unable to load extension.");
}
return nullptr;
}
} // namespace Extension
} // namespace Inkscape
/*
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:
*/
// vim:filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99:
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