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netsurf/render/html_forms.c

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/*
* Copyright 2011 Vincent Sanders <vince@netsurf-browser.org>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "render/form.h"
#include "render/html_internal.h"
#include "utils/corestrings.h"
#include "utils/log.h"
/**
* process form element from dom
*/
static struct form *
parse_form_element(const char *docenc, dom_node *node)
{
dom_string *ds_action = NULL;
dom_string *ds_charset = NULL;
dom_string *ds_target = NULL;
dom_string *ds_method = NULL;
dom_string *ds_enctype = NULL;
char *action = NULL, *charset = NULL, *target = NULL;
form_method method;
dom_html_form_element *formele = (dom_html_form_element *)(node);
struct form * ret = NULL;
/* Retrieve the attributes from the node */
if (dom_html_form_element_get_action(formele,
&ds_action) != DOM_NO_ERR)
goto out;
if (dom_html_form_element_get_accept_charset(formele,
&ds_charset) != DOM_NO_ERR)
goto out;
if (dom_html_form_element_get_target(formele,
&ds_target) != DOM_NO_ERR)
goto out;
if (dom_html_form_element_get_method(formele,
&ds_method) != DOM_NO_ERR)
goto out;
if (dom_html_form_element_get_enctype(formele,
&ds_enctype) != DOM_NO_ERR)
goto out;
/* Extract the plain attributes ready for use. We have to do this
* because we cannot guarantee that the dom_strings are NULL terminated
* and thus we copy them.
*/
if (ds_action != NULL)
action = strndup(dom_string_data(ds_action),
dom_string_byte_length(ds_action));
if (ds_charset != NULL)
charset = strndup(dom_string_data(ds_charset),
dom_string_byte_length(ds_charset));
if (ds_target != NULL)
target = strndup(dom_string_data(ds_target),
dom_string_byte_length(ds_target));
/* Determine the method */
method = method_GET;
if (ds_method != NULL) {
if (dom_string_caseless_lwc_isequal(ds_method,
corestring_lwc_post)) {
method = method_POST_URLENC;
if (ds_enctype != NULL) {
if (dom_string_caseless_lwc_isequal(ds_enctype,
corestring_lwc_multipart_form_data)) {
method = method_POST_MULTIPART;
}
}
}
}
/* Construct the form object */
ret = form_new(node, action, target, method, charset, docenc);
out:
if (ds_action != NULL)
dom_string_unref(ds_action);
if (ds_charset != NULL)
dom_string_unref(ds_charset);
if (ds_target != NULL)
dom_string_unref(ds_target);
if (ds_method != NULL)
dom_string_unref(ds_method);
if (ds_enctype != NULL)
dom_string_unref(ds_enctype);
if (action != NULL)
free(action);
if (charset != NULL)
free(charset);
if (target != NULL)
free(target);
return ret;
}
/* documented in html_internal.h */
struct form *html_forms_get_forms(const char *docenc, dom_html_document *doc)
{
dom_html_collection *forms;
struct form *ret = NULL, *newf;
dom_node *node;
unsigned long n;
uint32_t nforms;
if (doc == NULL)
return NULL;
/* Attempt to build a set of all the forms */
if (dom_html_document_get_forms(doc, &forms) != DOM_NO_ERR)
return NULL;
/* Count the number of forms so we can iterate */
if (dom_html_collection_get_length(forms, &nforms) != DOM_NO_ERR)
goto out;
/* Iterate the forms collection, making form structs for returning */
for (n = 0; n < nforms; ++n) {
if (dom_html_collection_item(forms, n, &node) != DOM_NO_ERR) {
goto out;
}
newf = parse_form_element(docenc, node);
dom_node_unref(node);
if (newf == NULL) {
goto err;
}
newf->prev = ret;
ret = newf;
}
/* All went well */
goto out;
err:
while (ret != NULL) {
struct form *prev = ret->prev;
/* Destroy ret */
free(ret);
ret = prev;
}
out:
/* Finished with the collection, return it */
dom_html_collection_unref(forms);
return ret;
}
static struct form *
find_form(struct form *forms, dom_html_form_element *form)
{
while (forms != NULL) {
if (forms->node == form)
break;
forms = forms->prev;
}
return forms;
}
static struct form_control *
parse_button_element(struct form *forms, dom_html_button_element *button)
{
struct form_control *control = NULL;
dom_exception err;
dom_html_form_element *form = NULL;
dom_string *ds_type = NULL;
dom_string *ds_value = NULL;
dom_string *ds_name = NULL;
err = dom_html_button_element_get_form(button, &form);
if (err != DOM_NO_ERR)
goto out;
err = dom_html_button_element_get_type(button, &ds_type);
if (err != DOM_NO_ERR)
goto out;
if (ds_type == NULL) {
control = form_new_control(button, GADGET_SUBMIT);
} else {
if (dom_string_caseless_lwc_isequal(ds_type,
corestring_lwc_submit)) {
control = form_new_control(button, GADGET_SUBMIT);
} else if (dom_string_caseless_lwc_isequal(ds_type,
corestring_lwc_reset)) {
control = form_new_control(button, GADGET_RESET);
} else {
control = form_new_control(button, GADGET_BUTTON);
}
}
if (control == NULL)
goto out;
err = dom_html_button_element_get_value(button, &ds_value);
if (err != DOM_NO_ERR)
goto out;
err = dom_html_button_element_get_name(button, &ds_name);
if (err != DOM_NO_ERR)
goto out;
if (ds_value != NULL) {
control->value = strndup(
dom_string_data(ds_value),
dom_string_byte_length(ds_value));
if (control->value == NULL) {
form_free_control(control);
control = NULL;
goto out;
}
}
if (ds_name != NULL) {
control->name = strndup(
dom_string_data(ds_name),
dom_string_byte_length(ds_name));
if (control->name == NULL) {
form_free_control(control);
control = NULL;
goto out;
}
}
if (form != NULL && control != NULL)
form_add_control(find_form(forms, form), control);
out:
if (form != NULL)
dom_node_unref(form);
if (ds_type != NULL)
dom_string_unref(ds_type);
if (ds_value != NULL)
dom_string_unref(ds_value);
if (ds_name != NULL)
dom_string_unref(ds_name);
return control;
}
static struct form_control *
parse_input_element(struct form *forms, dom_html_input_element *input)
{
struct form_control *control = NULL;
dom_html_form_element *form = NULL;
dom_string *ds_type = NULL;
dom_string *ds_name = NULL;
dom_string *ds_value = NULL;
char *name = NULL;
if (dom_html_input_element_get_form(input, &form) != DOM_NO_ERR)
goto out;
if (dom_html_input_element_get_type(input, &ds_type) != DOM_NO_ERR)
goto out;
if (dom_html_input_element_get_name(input, &ds_name) != DOM_NO_ERR)
goto out;
if (ds_name != NULL)
name = strndup(dom_string_data(ds_name),
dom_string_byte_length(ds_name));
if (ds_type != NULL && dom_string_caseless_lwc_isequal(ds_type,
corestring_lwc_password)) {
control = form_new_control(input, GADGET_PASSWORD);
} else if (ds_type != NULL && dom_string_caseless_lwc_isequal(ds_type,
corestring_lwc_file)) {
control = form_new_control(input, GADGET_FILE);
} else if (ds_type != NULL && dom_string_caseless_lwc_isequal(ds_type,
corestring_lwc_hidden)) {
control = form_new_control(input, GADGET_HIDDEN);
} else if (ds_type != NULL && dom_string_caseless_lwc_isequal(ds_type,
corestring_lwc_checkbox)) {
control = form_new_control(input, GADGET_CHECKBOX);
} else if (ds_type != NULL && dom_string_caseless_lwc_isequal(ds_type,
corestring_lwc_radio)) {
control = form_new_control(input, GADGET_RADIO);
} else if (ds_type != NULL && dom_string_caseless_lwc_isequal(ds_type,
corestring_lwc_submit)) {
control = form_new_control(input, GADGET_SUBMIT);
} else if (ds_type != NULL && dom_string_caseless_lwc_isequal(ds_type,
corestring_lwc_reset)) {
control = form_new_control(input, GADGET_RESET);
} else if (ds_type != NULL && dom_string_caseless_lwc_isequal(ds_type,
corestring_lwc_button)) {
control = form_new_control(input, GADGET_BUTTON);
} else if (ds_type != NULL && dom_string_caseless_lwc_isequal(ds_type,
corestring_lwc_image)) {
control = form_new_control(input, GADGET_IMAGE);
} else {
control = form_new_control(input, GADGET_TEXTBOX);
}
if (control == NULL)
goto out;
if (name != NULL) {
/* Hand the name string over */
control->name = name;
name = NULL;
}
if (control->type == GADGET_CHECKBOX || control->type == GADGET_RADIO) {
bool selected;
if (dom_html_input_element_get_checked(
input, &selected) == DOM_NO_ERR) {
control->selected = selected;
}
}
if (control->type == GADGET_PASSWORD ||
control->type == GADGET_TEXTBOX) {
int32_t maxlength;
if (dom_html_input_element_get_max_length(
input, &maxlength) != DOM_NO_ERR) {
maxlength = -1;
}
if (maxlength >= 0) {
/* Got valid maxlength */
control->maxlength = maxlength;
} else {
/* Input has no maxlength attr, or
* dom_html_input_element_get_max_length failed.
*
* Set it to something insane. */
control->maxlength = UINT_MAX;
}
}
if (control->type != GADGET_FILE && control->type != GADGET_IMAGE) {
if (dom_html_input_element_get_value(
input, &ds_value) == DOM_NO_ERR) {
if (ds_value != NULL) {
control->value = strndup(
dom_string_data(ds_value),
dom_string_byte_length(ds_value));
if (control->value == NULL) {
form_free_control(control);
control = NULL;
goto out;
}
control->length = strlen(control->value);
}
}
if (control->type == GADGET_TEXTBOX ||
control->type == GADGET_PASSWORD) {
if (control->value == NULL) {
control->value = strdup("");
if (control->value == NULL) {
form_free_control(control);
control = NULL;
goto out;
}
control->length = 0;
}
control->initial_value = strdup(control->value);
if (control->initial_value == NULL) {
form_free_control(control);
control = NULL;
goto out;
}
}
}
if (form != NULL && control != NULL)
form_add_control(find_form(forms, form), control);
out:
if (form != NULL)
dom_node_unref(form);
if (ds_type != NULL)
dom_string_unref(ds_type);
if (ds_name != NULL)
dom_string_unref(ds_name);
if (ds_value != NULL)
dom_string_unref(ds_value);
if (name != NULL)
free(name);
return control;
}
static struct form_control *
parse_textarea_element(struct form *forms, dom_html_text_area_element *ta)
{
struct form_control *control = NULL;
dom_html_form_element *form = NULL;
dom_string *ds_name = NULL;
char *name = NULL;
if (dom_html_text_area_element_get_form(ta, &form) != DOM_NO_ERR)
goto out;
if (dom_html_text_area_element_get_name(ta, &ds_name) != DOM_NO_ERR)
goto out;
if (ds_name != NULL)
name = strndup(dom_string_data(ds_name),
dom_string_byte_length(ds_name));
control = form_new_control(ta, GADGET_TEXTAREA);
if (control == NULL)
goto out;
if (name != NULL) {
/* Hand the name string over */
control->name = name;
name = NULL;
}
if (form != NULL && control != NULL)
form_add_control(find_form(forms, form), control);
out:
if (form != NULL)
dom_node_unref(form);
if (ds_name != NULL)
dom_string_unref(ds_name);
if (name != NULL)
free(name);
return control;
}
static struct form_control *
parse_select_element(struct form *forms, dom_html_select_element *select)
{
struct form_control *control = NULL;
dom_html_form_element *form = NULL;
dom_string *ds_name = NULL;
char *name = NULL;
if (dom_html_select_element_get_form(select, &form) != DOM_NO_ERR)
goto out;
if (dom_html_select_element_get_name(select, &ds_name) != DOM_NO_ERR)
goto out;
if (ds_name != NULL)
name = strndup(dom_string_data(ds_name),
dom_string_byte_length(ds_name));
control = form_new_control(select, GADGET_SELECT);
if (control == NULL)
goto out;
if (name != NULL) {
/* Hand the name string over */
control->name = name;
name = NULL;
}
dom_html_select_element_get_multiple(select,
&(control->data.select.multiple));
if (form != NULL && control != NULL)
form_add_control(find_form(forms, form), control);
out:
if (form != NULL)
dom_node_unref(form);
if (ds_name != NULL)
dom_string_unref(ds_name);
if (name != NULL)
free(name);
return control;
}
static struct form_control *
invent_fake_gadget(dom_node *node)
{
struct form_control *ctl = form_new_control(node, GADGET_HIDDEN);
if (ctl != NULL) {
ctl->value = strdup("");
ctl->initial_value = strdup("");
ctl->name = strdup("foo");
if (ctl->value == NULL || ctl->initial_value == NULL ||
ctl->name == NULL) {
form_free_control(ctl);
ctl = NULL;
}
}
return ctl;
}
/* documented in html_internal.h */
struct form_control *html_forms_get_control_for_node(struct form *forms, dom_node *node)
{
struct form *f;
struct form_control *ctl = NULL;
dom_exception err;
dom_string *ds_name = NULL;
/* Step one, see if we already have a control */
for (f = forms; f != NULL; f = f->prev) {
for (ctl = f->controls; ctl != NULL; ctl = ctl->next) {
if (ctl->node == node)
return ctl;
}
}
/* Step two, extract the node's name so we can construct a gadget. */
err = dom_element_get_tag_name(node, &ds_name);
if (err == DOM_NO_ERR && ds_name != NULL) {
/* Step three, attempt to work out what gadget to make */
if (dom_string_caseless_lwc_isequal(ds_name,
corestring_lwc_button)) {
ctl = parse_button_element(forms,
(dom_html_button_element *) node);
} else if (dom_string_caseless_lwc_isequal(ds_name,
corestring_lwc_input)) {
ctl = parse_input_element(forms,
(dom_html_input_element *) node);
} else if (dom_string_caseless_lwc_isequal(ds_name,
corestring_lwc_textarea)) {
ctl = parse_textarea_element(forms,
(dom_html_text_area_element *) node);
} else if (dom_string_caseless_lwc_isequal(ds_name,
corestring_lwc_select)) {
ctl = parse_select_element(forms,
(dom_html_select_element *) node);
}
}
/* If all else fails, fake gadget time */
if (ctl == NULL)
ctl = invent_fake_gadget(node);
if (ds_name != NULL)
dom_string_unref(ds_name);
return ctl;
}
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