239 lines
7.4 KiB
C
239 lines
7.4 KiB
C
/*
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* Copyright 2009 John-Mark Bell <jmb@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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/** \file
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* Low-level resource cache (interface)
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*/
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#ifndef NETSURF_CONTENT_LLCACHE_H_
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#define NETSURF_CONTENT_LLCACHE_H_
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include "utils/errors.h"
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struct ssl_cert_info;
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struct fetch_multipart_data;
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/** Handle for low-level cache object */
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typedef struct llcache_handle llcache_handle;
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/** POST data object for low-level cache requests */
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typedef struct {
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enum {
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LLCACHE_POST_URL_ENCODED,
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LLCACHE_POST_MULTIPART
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} type; /**< Type of POST data */
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union {
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char *urlenc; /**< URL encoded data */
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struct fetch_multipart_data *multipart; /**< Multipart data */
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} data; /**< POST data content */
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} llcache_post_data;
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/** Low-level cache event types */
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typedef enum {
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LLCACHE_EVENT_HAD_HEADERS, /**< Received all headers */
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LLCACHE_EVENT_HAD_DATA, /**< Received some data */
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LLCACHE_EVENT_DONE, /**< Finished fetching data */
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LLCACHE_EVENT_ERROR, /**< An error occurred during fetch */
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LLCACHE_EVENT_PROGRESS, /**< Fetch progress update */
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} llcache_event_type;
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/** Low-level cache events */
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typedef struct {
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llcache_event_type type; /**< Type of event */
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union {
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struct {
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const uint8_t *buf; /**< Buffer of data */
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size_t len; /**< Length of buffer, in bytes */
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} data; /**< Received data */
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const char *msg; /**< Error or progress message */
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} data; /**< Event data */
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} llcache_event;
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/**
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* Client callback for low-level cache events
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*
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* \param handle Handle for which event is issued
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* \param event Event data
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* \param pw Pointer to client-specific data
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* \return NSERROR_OK on success, appropriate error otherwise.
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*/
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typedef nserror (*llcache_handle_callback)(llcache_handle *handle,
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const llcache_event *event, void *pw);
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/** Flags for low-level cache object retrieval */
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#define LLCACHE_RETRIEVE_FORCE_FETCH (1 << 0) /* Force a new fetch */
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#define LLCACHE_RETRIEVE_VERIFIABLE (1 << 1) /* Requested URL was verified */
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#define LLCACHE_RETRIEVE_SNIFF_TYPE (1 << 2) /* Permit content-type sniffing */
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#define LLCACHE_RETRIEVE_NO_ERROR_PAGES (1 << 3) /* No error pages */
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/** Low-level cache query types */
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typedef enum {
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LLCACHE_QUERY_AUTH, /**< Need authentication details */
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LLCACHE_QUERY_REDIRECT, /**< Need permission to redirect */
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LLCACHE_QUERY_SSL /**< SSL chain needs inspection */
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} llcache_query_type;
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/** Low-level cache query */
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typedef struct {
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llcache_query_type type; /**< Type of query */
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const char *url; /**< URL being fetched */
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union {
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struct {
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const char *realm; /**< Authentication realm */
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} auth;
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struct {
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const char *target; /**< Redirect target */
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} redirect;
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struct {
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const struct ssl_cert_info *certs;
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size_t num; /**< Number of certs in chain */
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} ssl;
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} data;
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} llcache_query;
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/**
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* Response handler for fetch-related queries
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*
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* \param proceed Whether to proceed with the fetch or not
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* \param cbpw Opaque value provided to llcache_query_callback
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* \return NSERROR_OK on success, appropriate error otherwise
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*/
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typedef nserror (*llcache_query_response)(bool proceed, void *cbpw);
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/**
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* Callback to handle fetch-related queries
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*
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* \param query Object containing details of query
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* \param pw Pointer to callback-specific data
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* \param cb Callback that client should call once query is satisfied
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* \param cbpw Opaque value to pass into \a cb
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* \return NSERROR_OK on success, appropriate error otherwise
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*
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* \note This callback should return immediately. Once a suitable answer to
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* the query has been obtained, the provided response callback should be
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* called. This is intended to be an entirely asynchronous process.
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*/
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typedef nserror (*llcache_query_callback)(const llcache_query *query, void *pw,
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llcache_query_response cb, void *cbpw);
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/**
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* Initialise the low-level cache
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*
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* \param cb Query handler
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* \param pw Pointer to query handler data
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* \return NSERROR_OK on success, appropriate error otherwise.
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*/
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nserror llcache_initialise(llcache_query_callback cb, void *pw);
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/**
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* Poll the low-level cache
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*
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* \return NSERROR_OK on success, appropriate error otherwise.
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*/
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nserror llcache_poll(void);
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/**
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* Retrieve a handle for a low-level cache object
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*
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* \param url URL of the object to fetch
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* \param flags Object retrieval flags
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* \param referer Referring URL, or NULL if none
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* \param post POST data, or NULL for a GET request
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* \param cb Client callback for events
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* \param pw Pointer to client-specific data
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* \param result Pointer to location to recieve cache handle
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* \return NSERROR_OK on success, appropriate error otherwise
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*/
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nserror llcache_handle_retrieve(const char *url, uint32_t flags,
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const char *referer, const llcache_post_data *post,
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llcache_handle_callback cb, void *pw,
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llcache_handle **result);
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/**
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* Change the callback associated with a low-level cache handle
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*
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* \param handle Handle to change callback of
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* \param cb New callback
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* \param pw Client data for new callback
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* \return NSERROR_OK on success, appropriate error otherwise
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*/
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nserror llcache_handle_change_callback(llcache_handle *handle,
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llcache_handle_callback cb, void *pw);
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/**
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* Release a low-level cache handle
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*
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* \param handle Handle to release
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* \return NSERROR_OK on success, appropriate error otherwise
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*/
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nserror llcache_handle_release(llcache_handle *handle);
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/**
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* Retrieve the post-redirect URL of a low-level cache object
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*
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* \param handle Handle to retrieve URL from
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* \return Post-redirect URL of cache object
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*/
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const char *llcache_handle_get_url(const llcache_handle *handle);
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/**
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* Retrieve source data of a low-level cache object
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*
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* \param handle Handle to retrieve source data from
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* \param size Pointer to location to receive byte length of data
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* \return Pointer to source data
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*/
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const uint8_t *llcache_handle_get_source_data(const llcache_handle *handle,
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size_t *size);
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/**
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* Retrieve a header value associated with a low-level cache object
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*
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* \param handle Handle to retrieve header from
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* \param key Header name
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* \return Header value, or NULL if header does not exist
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*
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* \todo Make the key an enumeration, to avoid needless string comparisons
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* \todo Forcing the client to parse the header value seems wrong.
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* Better would be to return the actual value part and an array of
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* key-value pairs for any additional parameters.
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*/
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const char *llcache_handle_get_header(const llcache_handle *handle,
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const char *key);
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/**
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* Determine if the same underlying object is referenced by the given handles
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*
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* \param a First handle
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* \param b Second handle
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* \return True if handles reference the same object, false otherwise
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*/
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bool llcache_handle_references_same_object(const llcache_handle *a,
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const llcache_handle *b);
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#endif
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