mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-12-05 04:11:56 +03:00
d8f083bf52
Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>
782 lines
19 KiB
C
782 lines
19 KiB
C
/*
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* Copyright 2010 Michael Drake <tlsa@netsurf-browser.org>
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* Copyright 2020 Vincent Sanders <vince@netsurf-browser.org>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf 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 2 of the License.
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*
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* NetSurf 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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/**
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* \file
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* Implementation of HTML content DOM event handling.
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*/
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#include "utils/config.h"
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#include "utils/corestrings.h"
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#include "utils/nsoption.h"
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#include "utils/log.h"
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#include "utils/ascii.h"
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#include "utils/string.h"
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#include "utils/nsurl.h"
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#include "content/content.h"
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#include "javascript/js.h"
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#include "desktop/gui_internal.h"
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#include "desktop/gui_table.h"
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#include "netsurf/bitmap.h"
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#include "html/private.h"
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#include "html/object.h"
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#include "html/css.h"
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#include "html/box.h"
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#include "html/box_construct.h"
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#include "html/form_internal.h"
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#include "html/dom_event.h"
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/**
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* process a base element being inserted into the DOM
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*
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* \param htmlc The html content containing the DOM
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* \param node The DOM node being inserted
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* \return NSERROR_OK on success else appropriate error code
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*/
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static bool html_process_inserted_base(html_content *htmlc, dom_node *node)
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{
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dom_exception exc; /* returned by libdom functions */
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dom_string *atr_string;
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/* get href attribute if present */
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exc = dom_element_get_attribute(node, corestring_dom_href, &atr_string);
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if ((exc == DOM_NO_ERR) && (atr_string != NULL)) {
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nsurl *url;
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nserror error;
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/* get url from string */
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error = nsurl_create(dom_string_data(atr_string), &url);
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dom_string_unref(atr_string);
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if (error == NSERROR_OK) {
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if (htmlc->base_url != NULL) {
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nsurl_unref(htmlc->base_url);
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}
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htmlc->base_url = url;
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}
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}
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/* get target attribute if present and not already set */
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if (htmlc->base_target != NULL) {
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return true;
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}
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exc = dom_element_get_attribute(node,
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corestring_dom_target,
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&atr_string);
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if ((exc == DOM_NO_ERR) && (atr_string != NULL)) {
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/* Validation rules from the HTML5 spec for the base element:
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* The target must be one of _blank, _self, _parent, or
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* _top or any identifier which does not begin with an
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* underscore
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*/
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if (*dom_string_data(atr_string) != '_' ||
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dom_string_caseless_lwc_isequal(atr_string,
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corestring_lwc__blank) ||
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dom_string_caseless_lwc_isequal(atr_string,
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corestring_lwc__self) ||
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dom_string_caseless_lwc_isequal(atr_string,
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corestring_lwc__parent) ||
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dom_string_caseless_lwc_isequal(atr_string,
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corestring_lwc__top)) {
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htmlc->base_target = strdup(dom_string_data(atr_string));
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}
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dom_string_unref(atr_string);
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}
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return true;
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}
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/**
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* Process img element being inserted into the DOM.
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*
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* \param htmlc The html content containing the DOM
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* \param node The DOM node being inserted
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* \return NSERROR_OK on success else appropriate error code
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*/
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static bool html_process_inserted_img(html_content *htmlc, dom_node *node)
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{
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dom_string *src;
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nsurl *url;
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nserror err;
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dom_exception exc;
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bool success;
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/* Do nothing if foreground images are disabled */
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if (nsoption_bool(foreground_images) == false) {
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return true;
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}
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exc = dom_element_get_attribute(node, corestring_dom_src, &src);
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if (exc != DOM_NO_ERR || src == NULL) {
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return true;
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}
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err = nsurl_join(htmlc->base_url, dom_string_data(src), &url);
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if (err != NSERROR_OK) {
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dom_string_unref(src);
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return false;
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}
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dom_string_unref(src);
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/* Speculatively fetch the image */
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success = html_fetch_object(htmlc, url, NULL, CONTENT_IMAGE, false);
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nsurl_unref(url);
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return success;
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}
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/**
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* process a LINK element being inserted into the DOM
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*
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* \note only the http-equiv attribute for refresh is currently considered
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*
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* \param htmlc The html content containing the DOM
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* \param n The DOM node being inserted
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* \return NSERROR_OK on success else appropriate error code
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*/
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static bool html_process_inserted_link(html_content *c, dom_node *node)
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{
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struct content_rfc5988_link link; /* the link added to the content */
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dom_exception exc; /* returned by libdom functions */
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dom_string *atr_string;
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nserror error;
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/* Handle stylesheet loading */
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html_css_process_link(c, (dom_node *)node);
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/* try Generic link handling */
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memset(&link, 0, sizeof(struct content_rfc5988_link));
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/* check that the relation exists - w3c spec says must be present */
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exc = dom_element_get_attribute(node, corestring_dom_rel, &atr_string);
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if ((exc != DOM_NO_ERR) || (atr_string == NULL)) {
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return false;
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}
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/* get a lwc string containing the link relation */
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exc = dom_string_intern(atr_string, &link.rel);
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dom_string_unref(atr_string);
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if (exc != DOM_NO_ERR) {
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return false;
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}
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/* check that the href exists - w3c spec says must be present */
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exc = dom_element_get_attribute(node, corestring_dom_href, &atr_string);
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if ((exc != DOM_NO_ERR) || (atr_string == NULL)) {
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lwc_string_unref(link.rel);
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return false;
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}
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/* get nsurl */
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error = nsurl_join(c->base_url, dom_string_data(atr_string),
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&link.href);
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dom_string_unref(atr_string);
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if (error != NSERROR_OK) {
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lwc_string_unref(link.rel);
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return false;
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}
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/* look for optional properties -- we don't care if internment fails */
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exc = dom_element_get_attribute(node,
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corestring_dom_hreflang, &atr_string);
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if ((exc == DOM_NO_ERR) && (atr_string != NULL)) {
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/* get a lwc string containing the href lang */
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(void)dom_string_intern(atr_string, &link.hreflang);
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dom_string_unref(atr_string);
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}
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exc = dom_element_get_attribute(node,
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corestring_dom_type, &atr_string);
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if ((exc == DOM_NO_ERR) && (atr_string != NULL)) {
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/* get a lwc string containing the type */
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(void)dom_string_intern(atr_string, &link.type);
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dom_string_unref(atr_string);
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}
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exc = dom_element_get_attribute(node,
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corestring_dom_media, &atr_string);
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if ((exc == DOM_NO_ERR) && (atr_string != NULL)) {
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/* get a lwc string containing the media */
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(void)dom_string_intern(atr_string, &link.media);
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dom_string_unref(atr_string);
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}
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exc = dom_element_get_attribute(node,
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corestring_dom_sizes, &atr_string);
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if ((exc == DOM_NO_ERR) && (atr_string != NULL)) {
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/* get a lwc string containing the sizes */
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(void)dom_string_intern(atr_string, &link.sizes);
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dom_string_unref(atr_string);
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}
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/* add to content */
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content__add_rfc5988_link(&c->base, &link);
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if (link.sizes != NULL)
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lwc_string_unref(link.sizes);
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if (link.media != NULL)
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lwc_string_unref(link.media);
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if (link.type != NULL)
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lwc_string_unref(link.type);
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if (link.hreflang != NULL)
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lwc_string_unref(link.hreflang);
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nsurl_unref(link.href);
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lwc_string_unref(link.rel);
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return true;
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}
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/* handler for a SCRIPT which has been added to a tree */
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static void
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dom_SCRIPT_showed_up(html_content *htmlc, dom_html_script_element *script)
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{
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dom_exception exc;
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dom_html_script_element_flags flags;
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dom_hubbub_error res;
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bool within;
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if (!htmlc->enable_scripting) {
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NSLOG(netsurf, INFO, "Encountered a script, but scripting is off, ignoring");
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return;
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}
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NSLOG(netsurf, DEEPDEBUG, "Encountered a script, node %p showed up", script);
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exc = dom_html_script_element_get_flags(script, &flags);
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if (exc != DOM_NO_ERR) {
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NSLOG(netsurf, DEEPDEBUG, "Unable to retrieve flags, giving up");
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return;
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}
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if (flags & DOM_HTML_SCRIPT_ELEMENT_FLAG_PARSER_INSERTED) {
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NSLOG(netsurf, DEBUG, "Script was parser inserted, skipping");
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return;
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}
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exc = dom_node_contains(htmlc->document, script, &within);
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if (exc != DOM_NO_ERR) {
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NSLOG(netsurf, DEBUG, "Unable to determine if script was within document, ignoring");
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return;
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}
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if (!within) {
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NSLOG(netsurf, DEBUG, "Script was not within the document, ignoring for now");
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return;
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}
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res = html_process_script(htmlc, (dom_node *) script);
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if (res == DOM_HUBBUB_OK) {
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NSLOG(netsurf, DEEPDEBUG, "Inserted script has finished running");
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} else {
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if (res == (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_PAUSED)) {
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NSLOG(netsurf, DEEPDEBUG, "Inserted script has launced asynchronously");
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} else {
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NSLOG(netsurf, DEEPDEBUG, "Failure starting script");
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}
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}
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}
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/**
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* process a META element being inserted into the DOM
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*
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* \note only the http-equiv attribute for refresh is currently considered
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*
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* \param htmlc The html content containing the DOM
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* \param n The DOM node being inserted
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* \return NSERROR_OK on success else appropriate error code
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*/
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static nserror html_process_inserted_meta(html_content *c, dom_node *n)
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{
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union content_msg_data msg_data;
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const char *url, *end, *refresh = NULL;
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char *new_url;
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char quote = '\0';
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dom_string *equiv, *content;
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dom_exception exc;
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nsurl *nsurl;
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nserror error = NSERROR_OK;
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if (c->refresh) {
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/* refresh already delt with */
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return NSERROR_OK;
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}
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exc = dom_element_get_attribute(n, corestring_dom_http_equiv, &equiv);
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if (exc != DOM_NO_ERR) {
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return NSERROR_DOM;
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}
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if (equiv == NULL) {
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return NSERROR_OK;
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}
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if (!dom_string_caseless_lwc_isequal(equiv, corestring_lwc_refresh)) {
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dom_string_unref(equiv);
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return NSERROR_OK;
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}
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dom_string_unref(equiv);
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exc = dom_element_get_attribute(n, corestring_dom_content, &content);
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if (exc != DOM_NO_ERR) {
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return NSERROR_DOM;
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}
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if (content == NULL) {
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return NSERROR_OK;
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}
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end = dom_string_data(content) + dom_string_byte_length(content);
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/* content := *LWS intpart fracpart? *LWS [';' *LWS *1url *LWS]
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* intpart := 1*DIGIT
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* fracpart := 1*('.' | DIGIT)
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* url := "url" *LWS '=' *LWS (url-nq | url-sq | url-dq)
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* url-nq := *urlchar
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* url-sq := "'" *(urlchar | '"') "'"
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* url-dq := '"' *(urlchar | "'") '"'
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* urlchar := [#x9#x21#x23-#x26#x28-#x7E] | nonascii
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* nonascii := [#x80-#xD7FF#xE000-#xFFFD#x10000-#x10FFFF]
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*/
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url = dom_string_data(content);
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/* *LWS */
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while (url < end && ascii_is_space(*url)) {
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url++;
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}
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/* intpart */
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if (url == end || (*url < '0' || '9' < *url)) {
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/* Empty content, or invalid timeval */
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dom_string_unref(content);
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return NSERROR_OK;
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}
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msg_data.delay = (int) strtol(url, &new_url, 10);
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/* a very small delay and self-referencing URL can cause a loop
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* that grinds machines to a halt. To prevent this we set a
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* minimum refresh delay of 1s. */
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if (msg_data.delay < 1) {
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msg_data.delay = 1;
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}
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url = new_url;
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/* fracpart? (ignored, as delay is integer only) */
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while (url < end && (('0' <= *url && *url <= '9') ||
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*url == '.')) {
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url++;
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}
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/* *LWS */
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while (url < end && ascii_is_space(*url)) {
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url++;
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}
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/* ';' */
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if (url < end && *url == ';')
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url++;
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/* *LWS */
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while (url < end && ascii_is_space(*url)) {
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url++;
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}
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if (url == end) {
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/* Just delay specified, so refresh current page */
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dom_string_unref(content);
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c->base.refresh = nsurl_ref(content_get_url(&c->base));
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content_broadcast(&c->base, CONTENT_MSG_REFRESH, &msg_data);
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return NSERROR_OK;
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}
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/* "url" */
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if (url <= end - 3) {
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if (strncasecmp(url, "url", 3) == 0) {
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url += 3;
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} else {
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/* Unexpected input, ignore this header */
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dom_string_unref(content);
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return NSERROR_OK;
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}
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} else {
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/* Insufficient input, ignore this header */
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dom_string_unref(content);
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return NSERROR_OK;
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}
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/* *LWS */
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while (url < end && ascii_is_space(*url)) {
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url++;
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}
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/* '=' */
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if (url < end) {
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if (*url == '=') {
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url++;
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} else {
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/* Unexpected input, ignore this header */
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dom_string_unref(content);
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return NSERROR_OK;
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}
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} else {
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/* Insufficient input, ignore this header */
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dom_string_unref(content);
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return NSERROR_OK;
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}
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/* *LWS */
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while (url < end && ascii_is_space(*url)) {
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url++;
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}
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/* '"' or "'" */
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if (url < end && (*url == '"' || *url == '\'')) {
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quote = *url;
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url++;
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}
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/* Start of URL */
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refresh = url;
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if (quote != 0) {
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/* url-sq | url-dq */
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while (url < end && *url != quote)
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url++;
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} else {
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/* url-nq */
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while (url < end && !ascii_is_space(*url))
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url++;
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}
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/* '"' or "'" or *LWS (we don't care) */
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if (url > refresh) {
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/* There's a URL */
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new_url = strndup(refresh, url - refresh);
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if (new_url == NULL) {
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dom_string_unref(content);
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return NSERROR_NOMEM;
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}
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error = nsurl_join(c->base_url, new_url, &nsurl);
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if (error == NSERROR_OK) {
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/* broadcast valid refresh url */
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c->base.refresh = nsurl;
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content_broadcast(&c->base,
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CONTENT_MSG_REFRESH,
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&msg_data);
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c->refresh = true;
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}
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free(new_url);
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}
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dom_string_unref(content);
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return error;
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}
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/**
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* Process title element being inserted into the DOM.
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*
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* https://html.spec.whatwg.org/multipage/semantics.html#the-title-element
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*
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* \param htmlc The html content containing the DOM
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* \param node The DOM node being inserted
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* \return NSERROR_OK on success else appropriate error code
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*/
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static nserror html_process_inserted_title(html_content *htmlc, dom_node *node)
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{
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if (htmlc->title == NULL) {
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/* only the first title is considered */
|
|
htmlc->title = dom_node_ref(node);
|
|
}
|
|
return NSERROR_OK;
|
|
}
|
|
|
|
|
|
/** process title node */
|
|
static bool html_process_title(html_content *c, dom_node *node)
|
|
{
|
|
dom_exception exc; /* returned by libdom functions */
|
|
dom_string *title;
|
|
char *title_str;
|
|
bool success;
|
|
|
|
exc = dom_node_get_text_content(node, &title);
|
|
if ((exc != DOM_NO_ERR) || (title == NULL)) {
|
|
return false;
|
|
}
|
|
|
|
title_str = squash_whitespace(dom_string_data(title));
|
|
dom_string_unref(title);
|
|
|
|
if (title_str == NULL) {
|
|
return false;
|
|
}
|
|
|
|
success = content__set_title(&c->base, title_str);
|
|
|
|
free(title_str);
|
|
|
|
return success;
|
|
}
|
|
|
|
|
|
/**
|
|
* Deal with input elements being modified by resyncing their gadget
|
|
* if they have one.
|
|
*/
|
|
static void html_texty_element_update(html_content *htmlc, dom_node *node)
|
|
{
|
|
struct box *box = box_for_node(node);
|
|
if (box == NULL) {
|
|
return; /* No Box (yet?) so no gadget to update */
|
|
}
|
|
if (box->gadget == NULL) {
|
|
return; /* No gadget yet (under construction perhaps?) */
|
|
}
|
|
form_gadget_sync_with_dom(box->gadget);
|
|
/* And schedule a redraw for the box */
|
|
html__redraw_a_box(htmlc, box);
|
|
}
|
|
|
|
|
|
/**
|
|
* callback for DOMNodeInserted end type
|
|
*/
|
|
static void
|
|
dom_default_action_DOMNodeInserted_cb(struct dom_event *evt, void *pw)
|
|
{
|
|
dom_event_target *node;
|
|
dom_node_type type;
|
|
dom_exception exc;
|
|
html_content *htmlc = pw;
|
|
|
|
exc = dom_event_get_target(evt, &node);
|
|
if ((exc != DOM_NO_ERR) || (node == NULL)) {
|
|
/* failed to obtain the event target node */
|
|
return;
|
|
}
|
|
|
|
exc = dom_node_get_node_type(node, &type);
|
|
if ((exc == DOM_NO_ERR) && (type == DOM_ELEMENT_NODE)) {
|
|
/* an element node has been inserted */
|
|
dom_html_element_type tag_type;
|
|
|
|
exc = dom_html_element_get_tag_type(node, &tag_type);
|
|
if (exc != DOM_NO_ERR) {
|
|
tag_type = DOM_HTML_ELEMENT_TYPE__UNKNOWN;
|
|
}
|
|
|
|
switch (tag_type) {
|
|
case DOM_HTML_ELEMENT_TYPE_BASE:
|
|
html_process_inserted_base(htmlc, (dom_node *)node);
|
|
break;
|
|
|
|
case DOM_HTML_ELEMENT_TYPE_IMG:
|
|
html_process_inserted_img(htmlc, (dom_node *)node);
|
|
break;
|
|
|
|
case DOM_HTML_ELEMENT_TYPE_LINK:
|
|
html_process_inserted_link(htmlc, (dom_node *)node);
|
|
break;
|
|
|
|
case DOM_HTML_ELEMENT_TYPE_META:
|
|
html_process_inserted_meta(htmlc, (dom_node *)node);
|
|
break;
|
|
|
|
case DOM_HTML_ELEMENT_TYPE_STYLE:
|
|
html_css_process_style(htmlc, (dom_node *)node);
|
|
break;
|
|
|
|
case DOM_HTML_ELEMENT_TYPE_SCRIPT:
|
|
dom_SCRIPT_showed_up(htmlc,
|
|
(dom_html_script_element *)node);
|
|
break;
|
|
|
|
case DOM_HTML_ELEMENT_TYPE_TITLE:
|
|
html_process_inserted_title(htmlc, (dom_node *)node);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (htmlc->enable_scripting) {
|
|
/* ensure javascript context is available */
|
|
if (htmlc->jsthread == NULL) {
|
|
union content_msg_data msg_data;
|
|
|
|
msg_data.jsthread = &htmlc->jsthread;
|
|
content_broadcast(&htmlc->base,
|
|
CONTENT_MSG_GETTHREAD,
|
|
&msg_data);
|
|
NSLOG(netsurf, INFO,
|
|
"javascript context: %p (htmlc: %p)",
|
|
htmlc->jsthread,
|
|
htmlc);
|
|
}
|
|
if (htmlc->jsthread != NULL) {
|
|
js_handle_new_element(htmlc->jsthread,
|
|
(dom_element *) node);
|
|
}
|
|
}
|
|
}
|
|
dom_node_unref(node);
|
|
}
|
|
|
|
|
|
/**
|
|
* callback for DOMNodeInsertedIntoDocument end type
|
|
*/
|
|
static void
|
|
dom_default_action_DOMNodeInsertedIntoDocument_cb(struct dom_event *evt,
|
|
void *pw)
|
|
{
|
|
html_content *htmlc = pw;
|
|
dom_event_target *node;
|
|
dom_node_type type;
|
|
dom_exception exc;
|
|
|
|
exc = dom_event_get_target(evt, &node);
|
|
if ((exc == DOM_NO_ERR) && (node != NULL)) {
|
|
exc = dom_node_get_node_type(node, &type);
|
|
if ((exc == DOM_NO_ERR) && (type == DOM_ELEMENT_NODE)) {
|
|
/* an element node has been modified */
|
|
dom_html_element_type tag_type;
|
|
|
|
exc = dom_html_element_get_tag_type(node, &tag_type);
|
|
if (exc != DOM_NO_ERR) {
|
|
tag_type = DOM_HTML_ELEMENT_TYPE__UNKNOWN;
|
|
}
|
|
|
|
switch (tag_type) {
|
|
case DOM_HTML_ELEMENT_TYPE_SCRIPT:
|
|
dom_SCRIPT_showed_up(htmlc, (dom_html_script_element *) node);
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
dom_node_unref(node);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* callback for DOMSubtreeModified end type
|
|
*/
|
|
static void
|
|
dom_default_action_DOMSubtreeModified_cb(struct dom_event *evt, void *pw)
|
|
{
|
|
dom_event_target *node;
|
|
dom_node_type type;
|
|
dom_exception exc;
|
|
html_content *htmlc = pw;
|
|
|
|
exc = dom_event_get_target(evt, &node);
|
|
if ((exc == DOM_NO_ERR) && (node != NULL)) {
|
|
if (htmlc->title == (dom_node *)node) {
|
|
/* Node is our title node */
|
|
html_process_title(htmlc, (dom_node *)node);
|
|
dom_node_unref(node);
|
|
return;
|
|
}
|
|
|
|
exc = dom_node_get_node_type(node, &type);
|
|
if ((exc == DOM_NO_ERR) && (type == DOM_ELEMENT_NODE)) {
|
|
/* an element node has been modified */
|
|
dom_html_element_type tag_type;
|
|
|
|
exc = dom_html_element_get_tag_type(node, &tag_type);
|
|
if (exc != DOM_NO_ERR) {
|
|
tag_type = DOM_HTML_ELEMENT_TYPE__UNKNOWN;
|
|
}
|
|
|
|
switch (tag_type) {
|
|
case DOM_HTML_ELEMENT_TYPE_STYLE:
|
|
html_css_update_style(htmlc, (dom_node *)node);
|
|
break;
|
|
case DOM_HTML_ELEMENT_TYPE_TEXTAREA:
|
|
case DOM_HTML_ELEMENT_TYPE_INPUT:
|
|
html_texty_element_update(htmlc, (dom_node *)node);
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
dom_node_unref(node);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* callback for default action finished
|
|
*/
|
|
static void
|
|
dom_default_action_finished_cb(struct dom_event *evt, void *pw)
|
|
{
|
|
html_content *htmlc = pw;
|
|
|
|
if (htmlc->jsthread != NULL)
|
|
js_event_cleanup(htmlc->jsthread, evt);
|
|
}
|
|
|
|
|
|
/* exported interface documented in html/dom_event.c */
|
|
dom_default_action_callback
|
|
html_dom_event_fetcher(dom_string *type,
|
|
dom_default_action_phase phase,
|
|
void **pw)
|
|
{
|
|
NSLOG(netsurf, DEEPDEBUG,
|
|
"phase:%d type:%s", phase, dom_string_data(type));
|
|
|
|
if (phase == DOM_DEFAULT_ACTION_END) {
|
|
if (dom_string_isequal(type, corestring_dom_DOMNodeInserted)) {
|
|
return dom_default_action_DOMNodeInserted_cb;
|
|
} else if (dom_string_isequal(type, corestring_dom_DOMNodeInsertedIntoDocument)) {
|
|
return dom_default_action_DOMNodeInsertedIntoDocument_cb;
|
|
} else if (dom_string_isequal(type, corestring_dom_DOMSubtreeModified)) {
|
|
return dom_default_action_DOMSubtreeModified_cb;
|
|
}
|
|
} else if (phase == DOM_DEFAULT_ACTION_FINISHED) {
|
|
return dom_default_action_finished_cb;
|
|
}
|
|
return NULL;
|
|
}
|