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/*
* Copyright 2009 John-Mark Bell <jmb@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 <assert.h>
#include <libwapcaplet/libwapcaplet.h>
#include <dom/dom.h>
#include "content/content_protected.h"
#include "content/fetch.h"
#include "content/hlcache.h"
#include "desktop/system_colour.h"
#include "utils/corestrings.h"
#include "utils/utils.h"
#include "utils/http.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "css/css.h"
#include "css/hints.h"
#include "css/internal.h"
/* Define to trace import fetches */
#undef NSCSS_IMPORT_TRACE
struct content_css_data;
/**
* Type of callback called when a CSS object has finished
*
* \param css CSS object that has completed
* \param pw Client-specific data
*/
typedef void (*nscss_done_callback)(struct content_css_data *css, void *pw);
/**
* CSS content data
*/
struct content_css_data
{
css_stylesheet *sheet; /**< Stylesheet object */
char *charset; /**< Character set of stylesheet */
struct nscss_import *imports; /**< Array of imported sheets */
uint32_t import_count; /**< Number of sheets imported */
uint32_t next_to_register; /**< Index of next import to register */
nscss_done_callback done; /**< Completion callback */
void *pw; /**< Client data */
};
/**
* CSS content data
*/
typedef struct nscss_content
{
struct content base; /**< Underlying content object */
struct content_css_data data; /**< CSS data */
} nscss_content;
/**
* Context for import fetches
*/
typedef struct {
struct content_css_data *css; /**< Object containing import */
uint32_t index; /**< Index into parent sheet's
* imports array */
} nscss_import_ctx;
static bool nscss_process_data(struct content *c, const char *data,
unsigned int size);
static bool nscss_convert(struct content *c);
static void nscss_destroy(struct content *c);
static nserror nscss_clone(const struct content *old, struct content **newc);
static bool nscss_matches_quirks(const struct content *c, bool quirks);
static content_type nscss_content_type(void);
static nserror nscss_create_css_data(struct content_css_data *c,
const char *url, const char *charset, bool quirks,
nscss_done_callback done, void *pw);
static css_error nscss_process_css_data(struct content_css_data *c, const char *data,
unsigned int size);
static css_error nscss_convert_css_data(struct content_css_data *c);
static void nscss_destroy_css_data(struct content_css_data *c);
static void nscss_content_done(struct content_css_data *css, void *pw);
static css_error nscss_handle_import(void *pw, css_stylesheet *parent,
lwc_string *url, uint64_t media);
static nserror nscss_import(hlcache_handle *handle,
const hlcache_event *event, void *pw);
static css_error nscss_import_complete(nscss_import_ctx *ctx);
static css_error nscss_register_imports(struct content_css_data *c);
static css_error nscss_register_import(struct content_css_data *c,
const hlcache_handle *import);
static css_stylesheet *blank_import;
/**
* Initialise a CSS content
*
* \param handler content handler
* \param imime_type mime-type
* \param params Content-Type parameters
* \param llcache handle to content
* \param fallback_charset The character set to fallback to.
* \param quirks allow quirks
* \param c Content to initialise
* \return NSERROR_OK or error cod eon faliure
*/
static nserror
nscss_create(const content_handler *handler,
lwc_string *imime_type,
const http_parameter *params,
llcache_handle *llcache,
const char *fallback_charset,
bool quirks,
struct content **c)
{
nscss_content *result;
const char *charset = NULL;
const char *xnsbase = NULL;
lwc_string *charset_value = NULL;
union content_msg_data msg_data;
nserror error;
result = calloc(1, sizeof(nscss_content));
if (result == NULL)
return NSERROR_NOMEM;
error = content__init(&result->base, handler, imime_type,
params, llcache, fallback_charset, quirks);
if (error != NSERROR_OK) {
free(result);
return error;
}
/* Find charset specified on HTTP layer, if any */
error = http_parameter_list_find_item(params, corestring_lwc_charset,
&charset_value);
if (error != NSERROR_OK || lwc_string_length(charset_value) == 0) {
/* No charset specified, use fallback, if any */
/** \todo libcss will take this as gospel, which is wrong */
charset = fallback_charset;
} else {
charset = lwc_string_data(charset_value);
}
/* Compute base URL for stylesheet */
xnsbase = llcache_handle_get_header(llcache, "X-NS-Base");
if (xnsbase == NULL) {
xnsbase = nsurl_access(content_get_url(&result->base));
}
error = nscss_create_css_data(&result->data,
xnsbase, charset, result->base.quirks,
nscss_content_done, result);
if (error != NSERROR_OK) {
msg_data.error = messages_get("NoMemory");
content_broadcast(&result->base, CONTENT_MSG_ERROR, msg_data);
if (charset_value != NULL)
lwc_string_unref(charset_value);
free(result);
return error;
}
if (charset_value != NULL)
lwc_string_unref(charset_value);
*c = (struct content *) result;
return NSERROR_OK;
}
/**
* Create a struct content_css_data, creating a stylesheet object
*
* \param c Struct to populate
* \param url URL of stylesheet
* \param charset Stylesheet charset
* \param quirks Stylesheet quirks mode
* \param done Callback to call when content has completed
* \param pw Client data for \a done
* \return NSERROR_OK on success, NSERROR_NOMEM on memory exhaustion
*/
static nserror nscss_create_css_data(struct content_css_data *c,
const char *url, const char *charset, bool quirks,
nscss_done_callback done, void *pw)
{
css_error error;
css_stylesheet_params params;
c->pw = pw;
c->done = done;
c->next_to_register = (uint32_t) -1;
c->import_count = 0;
c->imports = NULL;
if (charset != NULL)
c->charset = strdup(charset);
else
c->charset = NULL;
params.params_version = CSS_STYLESHEET_PARAMS_VERSION_1;
params.level = CSS_LEVEL_DEFAULT;
params.charset = charset;
params.url = url;
params.title = NULL;
params.allow_quirks = quirks;
params.inline_style = false;
params.resolve = nscss_resolve_url;
params.resolve_pw = NULL;
params.import = nscss_handle_import;
params.import_pw = c;
params.color = ns_system_colour;
params.color_pw = NULL;
params.font = NULL;
params.font_pw = NULL;
error = css_stylesheet_create(&params, &c->sheet);
if (error != CSS_OK) {
return NSERROR_NOMEM;
}
return NSERROR_OK;
}
/**
* Process CSS source data
*
* \param c Content structure
* \param data Data to process
* \param size Number of bytes to process
* \return true on success, false on failure
*/
bool nscss_process_data(struct content *c, const char *data, unsigned int size)
{
nscss_content *css = (nscss_content *) c;
union content_msg_data msg_data;
css_error error;
error = nscss_process_css_data(&css->data, data, size);
if (error != CSS_OK && error != CSS_NEEDDATA) {
msg_data.error = "?";
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
}
return (error == CSS_OK || error == CSS_NEEDDATA);
}
/**
* Process CSS data
*
* \param c CSS content object
* \param data Data to process
* \param size Number of bytes to process
* \return CSS_OK on success, appropriate error otherwise
*/
static css_error nscss_process_css_data(struct content_css_data *c,
const char *data, unsigned int size)
{
return css_stylesheet_append_data(c->sheet,
(const uint8_t *) data, size);
}
/**
* Convert a CSS content ready for use
*
* \param c Content to convert
* \return true on success, false on failure
*/
bool nscss_convert(struct content *c)
{
nscss_content *css = (nscss_content *) c;
union content_msg_data msg_data;
css_error error;
error = nscss_convert_css_data(&css->data);
if (error != CSS_OK) {
msg_data.error = "?";
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
return true;
}
/**
* Convert CSS data ready for use
*
* \param c CSS data to convert
* \return CSS error
*/
static css_error nscss_convert_css_data(struct content_css_data *c)
{
css_error error;
error = css_stylesheet_data_done(c->sheet);
/* Process pending imports */
if (error == CSS_IMPORTS_PENDING) {
/* We must not have registered any imports yet */
assert(c->next_to_register == (uint32_t) -1);
/* Start registering, until we find one that
* hasn't finished fetching */
c->next_to_register = 0;
error = nscss_register_imports(c);
} else if (error == CSS_OK) {
/* No imports, and no errors, so complete conversion */
c->done(c, c->pw);
} else {
const char *url;
if (css_stylesheet_get_url(c->sheet, &url) == CSS_OK) {
LOG("Failed converting %p %s (%d)", c, url, error);
} else {
LOG("Failed converting %p (%d)", c, error);
}
}
return error;
}
/**
* Clean up a CSS content
*
* \param c Content to clean up
*/
void nscss_destroy(struct content *c)
{
nscss_content *css = (nscss_content *) c;
nscss_destroy_css_data(&css->data);
}
/**
* Clean up CSS data
*
* \param c CSS data to clean up
*/
static void nscss_destroy_css_data(struct content_css_data *c)
{
uint32_t i;
for (i = 0; i < c->import_count; i++) {
if (c->imports[i].c != NULL) {
hlcache_handle_release(c->imports[i].c);
}
c->imports[i].c = NULL;
}
free(c->imports);
if (c->sheet != NULL) {
css_stylesheet_destroy(c->sheet);
c->sheet = NULL;
}
free(c->charset);
}
nserror nscss_clone(const struct content *old, struct content **newc)
{
const nscss_content *old_css = (const nscss_content *) old;
nscss_content *new_css;
const char *data;
unsigned long size;
nserror error;
new_css = calloc(1, sizeof(nscss_content));
if (new_css == NULL)
return NSERROR_NOMEM;
/* Clone content */
error = content__clone(old, &new_css->base);
if (error != NSERROR_OK) {
content_destroy(&new_css->base);
return error;
}
/* Simply replay create/process/convert */
error = nscss_create_css_data(&new_css->data,
nsurl_access(content_get_url(&new_css->base)),
old_css->data.charset,
new_css->base.quirks,
nscss_content_done, new_css);
if (error != NSERROR_OK) {
content_destroy(&new_css->base);
return error;
}
data = content__get_source_data(&new_css->base, &size);
if (size > 0) {
if (nscss_process_data(&new_css->base, data, size) == false) {
content_destroy(&new_css->base);
return NSERROR_CLONE_FAILED;
}
}
if (old->status == CONTENT_STATUS_READY ||
old->status == CONTENT_STATUS_DONE) {
if (nscss_convert(&new_css->base) == false) {
content_destroy(&new_css->base);
return NSERROR_CLONE_FAILED;
}
}
*newc = (struct content *) new_css;
return NSERROR_OK;
}
bool nscss_matches_quirks(const struct content *c, bool quirks)
{
return c->quirks == quirks;
}
/**
* Retrieve the stylesheet object associated with a CSS content
*
* \param h Stylesheet content
* \return Pointer to stylesheet object
*/
css_stylesheet *nscss_get_stylesheet(struct hlcache_handle *h)
{
nscss_content *c = (nscss_content *) hlcache_handle_get_content(h);
assert(c != NULL);
return c->data.sheet;
}
/**
* Retrieve imported stylesheets
*
* \param h Stylesheet containing imports
* \param n Pointer to location to receive number of imports
* \return Pointer to array of imported stylesheets
*/
struct nscss_import *nscss_get_imports(hlcache_handle *h, uint32_t *n)
{
nscss_content *c = (nscss_content *) hlcache_handle_get_content(h);
assert(c != NULL);
assert(n != NULL);
*n = c->data.import_count;
return c->data.imports;
}
/**
* Compute the type of a content
*
* \return CONTENT_CSS
*/
content_type nscss_content_type(void)
{
return CONTENT_CSS;
}
/*****************************************************************************
* Object completion *
*****************************************************************************/
/**
* Handle notification that a CSS object is done
*
* \param css CSS object
* \param pw Private data
*/
void nscss_content_done(struct content_css_data *css, void *pw)
{
union content_msg_data msg_data;
struct content *c = pw;
uint32_t i;
size_t size;
css_error error;
/* Retrieve the size of this sheet */
error = css_stylesheet_size(css->sheet, &size);
if (error != CSS_OK) {
msg_data.error = "?";
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
content_set_error(c);
return;
}
c->size += size;
/* Add on the size of the imported sheets */
for (i = 0; i < css->import_count; i++) {
if (css->imports[i].c != NULL) {
struct content *import = hlcache_handle_get_content(
css->imports[i].c);
if (import != NULL) {
c->size += import->size;
}
}
}
/* Finally, catch the content's users up with reality */
content_set_ready(c);
content_set_done(c);
}
/*****************************************************************************
* Import handling *
*****************************************************************************/
/**
* Handle notification of the need for an imported stylesheet
*
* \param pw CSS object requesting the import
* \param parent Stylesheet requesting the import
* \param url URL of the imported sheet
* \param media Applicable media for the imported sheet
* \return CSS_OK on success, appropriate error otherwise
*/
css_error nscss_handle_import(void *pw, css_stylesheet *parent,
lwc_string *url, uint64_t media)
{
content_type accept = CONTENT_CSS;
struct content_css_data *c = pw;
nscss_import_ctx *ctx;
hlcache_child_context child;
struct nscss_import *imports;
const char *referer;
css_error error;
nserror nerror;
nsurl *ns_url;
nsurl *ns_ref;
assert(parent == c->sheet);
error = css_stylesheet_get_url(c->sheet, &referer);
if (error != CSS_OK) {
return error;
}
ctx = malloc(sizeof(*ctx));
if (ctx == NULL)
return CSS_NOMEM;
ctx->css = c;
ctx->index = c->import_count;
/* Increase space in table */
imports = realloc(c->imports, (c->import_count + 1) *
sizeof(struct nscss_import));
if (imports == NULL) {
free(ctx);
return CSS_NOMEM;
}
c->imports = imports;
/** \todo fallback charset */
child.charset = NULL;
error = css_stylesheet_quirks_allowed(c->sheet, &child.quirks);
if (error != CSS_OK) {
free(ctx);
return error;
}
/* Create content */
c->imports[c->import_count].media = media;
/** \todo Why aren't we getting a relative url part, to join? */
nerror = nsurl_create(lwc_string_data(url), &ns_url);
if (nerror != NSERROR_OK) {
free(ctx);
return CSS_NOMEM;
}
/** \todo Constructing nsurl for referer here is silly, avoid */
nerror = nsurl_create(referer, &ns_ref);
if (nerror != NSERROR_OK) {
nsurl_unref(ns_url);
free(ctx);
return CSS_NOMEM;
}
/* Avoid importing ourself */
if (nsurl_compare(ns_url, ns_ref, NSURL_COMPLETE)) {
c->imports[c->import_count].c = NULL;
/* No longer require context as we're not fetching anything */
free(ctx);
ctx = NULL;
} else {
nerror = hlcache_handle_retrieve(ns_url,
0, ns_ref, NULL, nscss_import, ctx,
&child, accept,
&c->imports[c->import_count].c);
if (nerror != NSERROR_OK) {
free(ctx);
return CSS_NOMEM;
}
}
nsurl_unref(ns_url);
nsurl_unref(ns_ref);
#ifdef NSCSS_IMPORT_TRACE
LOG("Import %d '%s' -> (handle: %p ctx: %p)", c->import_count, lwc_string_data(url), c->imports[c->import_count].c, ctx);
#endif
c->import_count++;
return CSS_OK;
}
/**
* Handler for imported stylesheet events
*
* \param handle Handle for stylesheet
* \param event Event object
* \param pw Callback context
* \return NSERROR_OK on success, appropriate error otherwise
*/
nserror nscss_import(hlcache_handle *handle,
const hlcache_event *event, void *pw)
{
nscss_import_ctx *ctx = pw;
css_error error = CSS_OK;
#ifdef NSCSS_IMPORT_TRACE
LOG("Event %d for %p (%p)", event->type, handle, ctx);
#endif
assert(ctx->css->imports[ctx->index].c == handle);
switch (event->type) {
case CONTENT_MSG_DONE:
error = nscss_import_complete(ctx);
break;
case CONTENT_MSG_ERROR:
hlcache_handle_release(handle);
ctx->css->imports[ctx->index].c = NULL;
error = nscss_import_complete(ctx);
/* Already released handle */
break;
default:
break;
}
/* Preserve out-of-memory. Anything else is OK */
return error == CSS_NOMEM ? NSERROR_NOMEM : NSERROR_OK;
}
/**
* Handle an imported stylesheet completing
*
* \param ctx Import context
* \return CSS_OK on success, appropriate error otherwise
*/
css_error nscss_import_complete(nscss_import_ctx *ctx)
{
css_error error = CSS_OK;
/* If this import is the next to be registered, do so */
if (ctx->css->next_to_register == ctx->index)
error = nscss_register_imports(ctx->css);
#ifdef NSCSS_IMPORT_TRACE
LOG("Destroying import context %p for %d", ctx, ctx->index);
#endif
/* No longer need import context */
free(ctx);
return error;
}
/*****************************************************************************
* Import registration *
*****************************************************************************/
/**
* Register imports with a stylesheet
*
* \param c CSS object containing the imports
* \return CSS_OK on success, appropriate error otherwise
*/
css_error nscss_register_imports(struct content_css_data *c)
{
uint32_t index;
css_error error;
assert(c->next_to_register != (uint32_t) -1);
assert(c->next_to_register < c->import_count);
/* Register imported sheets */
for (index = c->next_to_register; index < c->import_count; index++) {
/* Stop registering if we encounter one whose fetch hasn't
* completed yet. We'll resume at this point when it has
* completed.
*/
if (c->imports[index].c != NULL &&
content_get_status(c->imports[index].c) !=
CONTENT_STATUS_DONE) {
break;
}
error = nscss_register_import(c, c->imports[index].c);
if (error != CSS_OK)
return error;
}
/* Record identity of the next import to register */
c->next_to_register = (uint32_t) index;
if (c->next_to_register == c->import_count) {
/* No more imports: notify parent that we're DONE */
c->done(c, c->pw);
}
return CSS_OK;
}
/**
* Register an import with a stylesheet
*
* \param c CSS object that requested the import
* \param import Cache handle of import, or NULL for blank
* \return CSS_OK on success, appropriate error otherwise
*/
css_error nscss_register_import(struct content_css_data *c,
const hlcache_handle *import)
{
css_stylesheet *sheet;
css_error error;
if (import != NULL) {
nscss_content *s =
(nscss_content *) hlcache_handle_get_content(import);
sheet = s->data.sheet;
} else {
/* Create a blank sheet if needed. */
if (blank_import == NULL) {
css_stylesheet_params params;
params.params_version = CSS_STYLESHEET_PARAMS_VERSION_1;
params.level = CSS_LEVEL_DEFAULT;
params.charset = NULL;
params.url = "";
params.title = NULL;
params.allow_quirks = false;
params.inline_style = false;
params.resolve = nscss_resolve_url;
params.resolve_pw = NULL;
params.import = NULL;
params.import_pw = NULL;
params.color = ns_system_colour;
params.color_pw = NULL;
params.font = NULL;
params.font_pw = NULL;
error = css_stylesheet_create(&params, &blank_import);
if (error != CSS_OK) {
return error;
}
error = css_stylesheet_data_done(blank_import);
if (error != CSS_OK) {
css_stylesheet_destroy(blank_import);
return error;
}
}
sheet = blank_import;
}
error = css_stylesheet_register_import(c->sheet, sheet);
if (error != CSS_OK) {
return error;
}
return error;
}
/**
* Clean up after the CSS content handler
*/
static void nscss_fini(void)
{
if (blank_import != NULL) {
css_stylesheet_destroy(blank_import);
blank_import = NULL;
}
css_hint_fini();
}
static const content_handler css_content_handler = {
.fini = nscss_fini,
.create = nscss_create,
.process_data = nscss_process_data,
.data_complete = nscss_convert,
.destroy = nscss_destroy,
.clone = nscss_clone,
.matches_quirks = nscss_matches_quirks,
.type = nscss_content_type,
.no_share = false,
};
/**
* Initialise the CSS content handler
*/
nserror nscss_init(void)
{
nserror error;
error = content_factory_register_handler("text/css",
&css_content_handler);
if (error != NSERROR_OK)
goto error;
error = css_hint_init();
if (error != NSERROR_OK)
goto error;
return NSERROR_OK;
error:
nscss_fini();
return error;
}
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