From 37755fb135f9e582bd35ef6d282515ee71d619f2 Mon Sep 17 00:00:00 2001 From: Vincent Sanders Date: Mon, 25 Aug 2014 15:58:56 -0700 Subject: add incomplete scheme fetcher for javascript urls --- javascript/fetcher.c | 238 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 238 insertions(+) create mode 100644 javascript/fetcher.c (limited to 'javascript/fetcher.c') diff --git a/javascript/fetcher.c b/javascript/fetcher.c new file mode 100644 index 000000000..690751cd3 --- /dev/null +++ b/javascript/fetcher.c @@ -0,0 +1,238 @@ +/* + * Copyright 2012 Vincent Sanders + * + * 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 . + */ + +/** \file + * implementation for javascript scheme fetcher + * + * This fetcher implements http://www.whatwg.org/specs/web-apps/current-work/multipage/browsers.html#javascript-protocol + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "utils/config.h" +#include "utils/errors.h" +#include "utils/corestrings.h" +#include "utils/nsoption.h" +#include "utils/log.h" +#include "utils/messages.h" +#include "utils/utils.h" +#include "utils/ring.h" +#include "desktop/gui_factory.h" + +#include "content/fetch.h" +#include "content/fetchers.h" +#include "javascript/fetcher.h" +#include "content/urldb.h" + +/** Context for an resource fetch */ +struct fetch_javascript_context { + struct fetch_javascript_context *r_next, *r_prev; + + struct fetch *fetchh; /**< Handle for this fetch */ + + bool aborted; /**< Flag indicating fetch has been aborted */ + bool locked; /**< Flag indicating entry is already entered */ + + nsurl *url; +}; + +static struct fetch_javascript_context *ring = NULL; + + +/** issue fetch callbacks with locking */ +static inline bool fetch_javascript_send_callback(const fetch_msg *msg, + struct fetch_javascript_context *ctx) +{ + ctx->locked = true; + fetch_send_callback(msg, ctx->fetchh); + ctx->locked = false; + + return ctx->aborted; +} + + +/** + * called from poll to progress fetch. + * + * \todo This is currently completely unimplemented and just returns 204 + */ +static bool fetch_javascript_handler(struct fetch_javascript_context *ctx) +{ + fetch_msg msg; + int code = 204; + + /* content is going to return error code */ + fetch_set_http_code(ctx->fetchh, code); + + msg.type = FETCH_FINISHED; + fetch_javascript_send_callback(&msg, ctx); + + return true; +} + + + +/** callback to initialise the resource fetcher. */ +static bool fetch_javascript_initialise(lwc_string *scheme) +{ + return true; +} + +/** callback to finalise the resource fetcher. */ +static void fetch_javascript_finalise(lwc_string *scheme) +{ +} + +static bool fetch_javascript_can_fetch(const nsurl *url) +{ + return true; +} + +/** callback to set up a resource fetch context. */ +static void * +fetch_javascript_setup(struct fetch *fetchh, + nsurl *url, + bool only_2xx, + bool downgrade_tls, + const char *post_urlenc, + const struct fetch_multipart_data *post_multipart, + const char **headers) +{ + struct fetch_javascript_context *ctx; + + ctx = calloc(1, sizeof(*ctx)); + if (ctx == NULL) + return NULL; + + ctx->url = nsurl_ref(url); + + ctx->fetchh = fetchh; + + RING_INSERT(ring, ctx); + + return ctx; +} + +/** callback to free a resource fetch */ +static void fetch_javascript_free(void *ctx) +{ + struct fetch_javascript_context *c = ctx; + if (c->url != NULL) { + nsurl_unref(c->url); + } + RING_REMOVE(ring, c); + free(ctx); +} + +/** callback to start a resource fetch */ +static bool fetch_javascript_start(void *ctx) +{ + return true; +} + +/** callback to abort a resource fetch */ +static void fetch_javascript_abort(void *ctx) +{ + struct fetch_javascript_context *c = ctx; + + /* To avoid the poll loop having to deal with the fetch context + * disappearing from under it, we simply flag the abort here. + * The poll loop itself will perform the appropriate cleanup. + */ + c->aborted = true; +} + + +/** callback to poll for additional resource fetch contents */ +static void fetch_javascript_poll(lwc_string *scheme) +{ + struct fetch_javascript_context *c, *next; + + if (ring == NULL) return; + + /* Iterate over ring, processing each pending fetch */ + c = ring; + do { + /* Ignore fetches that have been flagged as locked. + * This allows safe re-entrant calls to this function. + * Re-entrancy can occur if, as a result of a callback, + * the interested party causes fetch_poll() to be called + * again. + */ + if (c->locked == true) { + next = c->r_next; + continue; + } + + /* Only process non-aborted fetches */ + if (c->aborted == false) { + /* resource fetches can be processed in one go */ + fetch_javascript_handler(c); + } + + /* Compute next fetch item at the last possible moment + * as processing this item may have added to the ring + */ + next = c->r_next; + + fetch_remove_from_queues(c->fetchh); + fetch_free(c->fetchh); + + /* Advance to next ring entry, exiting if we've reached + * the start of the ring or the ring has become empty + */ + } while ( (c = next) != ring && ring != NULL); +} + +/** + * Register javascript scheme fetcher with fetcher factory. + * + * \return NSERROR_OK on success or appropriate error code on faliure. +*/ +nserror fetch_javascript_register(void) +{ + lwc_string *scheme = lwc_string_ref(corestring_lwc_javascript); + const struct fetcher_operation_table fetcher_ops = { + .initialise = fetch_javascript_initialise, + .acceptable = fetch_javascript_can_fetch, + .setup = fetch_javascript_setup, + .start = fetch_javascript_start, + .abort = fetch_javascript_abort, + .free = fetch_javascript_free, + .poll = fetch_javascript_poll, + .finalise = fetch_javascript_finalise + }; + + return fetcher_add(scheme, &fetcher_ops); +} -- cgit v1.2.3