diff options
Diffstat (limited to 'content/handlers/html/html_forms.c')
| -rw-r--r-- | content/handlers/html/html_forms.c | 579 |
1 files changed, 579 insertions, 0 deletions
diff --git a/content/handlers/html/html_forms.c b/content/handlers/html/html_forms.c new file mode 100644 index 000000000..915eb002f --- /dev/null +++ b/content/handlers/html/html_forms.c @@ -0,0 +1,579 @@ +/* + * 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/>. + */ + +/** + * \file + * HTML form handling implementation + */ + +#include "utils/config.h" +#include "utils/corestrings.h" +#include "utils/log.h" + +#include "html/form_internal.h" +#include "html/html_internal.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; +} |