/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* camel-session.c : Abstract class for an email session */
/*
*
* Author:
* Bertrand Guiheneuf <bertrand@helixcode.com>
* Dan Winship <danw@helixcode.com>
* Jeffrey Stedfast <fejj@helixcode.com>
*
* Copyright 1999, 2000 Helix Code, Inc. (http://www.helixcode.com)
*
* This program 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; either version 2 of the
* License, or (at your option) any later version.
*
* This program 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include <config.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include "camel-session.h"
#include "camel-store.h"
#include "camel-transport.h"
#include "camel-exception.h"
#include "string-utils.h"
#include "camel-url.h"
#include "hash-table-utils.h"
static CamelObjectClass *parent_class;
static void
camel_session_init (CamelSession *session)
{
session->modules = camel_provider_init ();
session->providers = g_hash_table_new (g_strcase_hash, g_strcase_equal);
}
static gboolean
camel_session_destroy_provider (gpointer key, gpointer value, gpointer user_data)
{
CamelProvider *prov = (CamelProvider *)value;
g_hash_table_destroy (prov->service_cache);
return TRUE;
}
static void
camel_session_finalise (CamelObject *o)
{
CamelSession *session = (CamelSession *)o;
g_hash_table_foreach_remove (session->providers,
camel_session_destroy_provider, NULL);
g_hash_table_destroy (session->providers);
}
static void
camel_session_class_init (CamelSessionClass *camel_session_class)
{
parent_class = camel_type_get_global_classfuncs (camel_object_get_type ());
}
CamelType
camel_session_get_type (void)
{
static CamelType camel_session_type = CAMEL_INVALID_TYPE;
if (camel_session_type == CAMEL_INVALID_TYPE) {
camel_session_type = camel_type_register (camel_object_get_type (), "CamelSession",
sizeof (CamelSession),
sizeof (CamelSessionClass),
(CamelObjectClassInitFunc) camel_session_class_init,
NULL,
(CamelObjectInitFunc) camel_session_init,
(CamelObjectFinalizeFunc) camel_session_finalise);
}
return camel_session_type;
}
/**
* camel_session_new:
* @storage_path: Path to a directory Camel can use for persistent storage.
* (This directory must already exist.)
* @authenticator: A callback for discussing authentication information
* @registrar: A callback for registering timeout callbacks
* @remove: A callback for removing timeout callbacks
*
* This creates a new CamelSession object, which represents global state
* for the Camel library, and contains callbacks that can be used to
* interact with the main application.
*
* Return value: the new CamelSession
**/
CamelSession *
camel_session_new (const char *storage_path,
CamelAuthCallback authenticator,
CamelTimeoutRegisterCallback registrar,
CamelTimeoutRemoveCallback remover)
{
CamelSession *session = CAMEL_SESSION (camel_object_new (CAMEL_SESSION_TYPE));
session->storage_path = g_strdup (storage_path);
session->authenticator = authenticator;
session->registrar = registrar;
session->remover = remover;
return session;
}
/**
* camel_session_register_provider:
* @session: a session object
* @protocol: the protocol the provider provides for
* @provider: provider object
*
* Registers a protocol to provider mapping for the session.
**/
void
camel_session_register_provider (CamelSession *session,
CamelProvider *provider)
{
g_return_if_fail (CAMEL_IS_SESSION (session));
g_return_if_fail (provider != NULL);
g_hash_table_insert (session->providers, provider->protocol, provider);
}
static void
ensure_loaded (gpointer key, gpointer value, gpointer user_data)
{
CamelSession *session = user_data;
char *name = key;
char *path = value;
if (!g_hash_table_lookup (session->providers, name)) {
CamelException ex;
camel_exception_init (&ex);
camel_provider_load (session, path, &ex);
camel_exception_clear (&ex);
}
}
static gint
provider_compare (gconstpointer a, gconstpointer b)
{
const CamelProvider *cpa = (const CamelProvider *)a;
const CamelProvider *cpb = (const CamelProvider *)b;
return strcmp (cpa->name, cpb->name);
}
static void
add_to_list (gpointer key, gpointer value, gpointer user_data)
{
GList **list = user_data;
CamelProvider *prov = value;
*list = g_list_insert_sorted (*list, prov, provider_compare);
}
/**
* camel_session_list_providers:
* @session: the session
* @load: whether or not to load in providers that are not already loaded
*
* This returns a list of available providers in this session. If @load
* is %TRUE, it will first load in all available providers that haven't
* yet been loaded.
*
* Return value: a GList of providers, which the caller must free.
**/
GList *
camel_session_list_providers (CamelSession *session, gboolean load)
{
GList *list;
g_return_val_if_fail (CAMEL_IS_SESSION (session), NULL);
if (load) {
g_hash_table_foreach (session->modules, ensure_loaded, session);
}
list = NULL;
g_hash_table_foreach (session->providers, add_to_list, &list);
return list;
}
static void
service_cache_remove (CamelService *service, gpointer event_data, gpointer user_data)
{
CamelProvider *provider;
CamelSession *session = CAMEL_SESSION (user_data);
g_return_if_fail (CAMEL_IS_SESSION (session));
g_return_if_fail (service != NULL);
g_return_if_fail (service->url != NULL);
provider = g_hash_table_lookup (session->providers, service->url->protocol);
g_hash_table_remove (provider->service_cache, service->url);
}
/**
* camel_session_get_service:
* @session: the CamelSession
* @url_string: a Camel URL describing the service to get
* @type: the provider type (%CAMEL_PROVIDER_STORE or
* %CAMEL_PROVIDER_TRANSPORT) to get, since some URLs may be able
* to specify either type.
* @ex: a CamelException
*
* This resolves a CamelURL into a CamelService, including loading the
* provider library for that service if it has not already been loaded.
*
* Services are cached, and asking for "the same" @url_string multiple
* times will return the same CamelService (with its reference count
* incremented by one each time). What constitutes "the same" URL
* depends in part on the provider.
*
* Return value: the requested CamelService, or %NULL
**/
CamelService *
camel_session_get_service (CamelSession *session, const char *url_string,
CamelProviderType type, CamelException *ex)
{
CamelURL *url;
CamelProvider *provider;
CamelService *service;
url = camel_url_new (url_string, ex);
if (!url)
return NULL;
/* We need to look up the provider so we can then lookup
the service in the provider's cache */
provider = g_hash_table_lookup (session->providers, url->protocol);
if (!provider) {
/* See if there's one we can load. */
char *path;
path = g_hash_table_lookup (session->modules, url->protocol);
if (path) {
camel_provider_load (session, path, ex);
if (camel_exception_get_id (ex) !=
CAMEL_EXCEPTION_NONE) {
camel_url_free (url);
return NULL;
}
}
provider = g_hash_table_lookup (session->providers, url->protocol);
}
if (!provider || !provider->object_types[type]) {
camel_exception_setv (ex, CAMEL_EXCEPTION_SERVICE_URL_INVALID,
_("No provider available for protocol `%s'"),
url->protocol);
camel_url_free (url);
return NULL;
}
/* Now look up the service in the provider's cache */
service = g_hash_table_lookup (provider->service_cache, url);
if (service != NULL) {
camel_url_free (url);
camel_object_ref (CAMEL_OBJECT (service));
return service;
}
service = camel_service_new (provider->object_types[type], session, provider, url, ex);
if (service) {
g_hash_table_insert (provider->service_cache, url, service);
camel_object_hook_event (CAMEL_OBJECT (service), "finalize", (CamelObjectEventHookFunc) service_cache_remove, session);
}
return service;
}
/**
* camel_session_get_service_connected:
* @session: the CamelSession
* @url_string: a Camel URL describing the service to get
* @type: the provider type
* @ex: a CamelException
*
* This works like camel_session_get_service(), but also ensures that
* the returned service will have been successfully connected (via
* camel_service_connect().)
*
* Return value: the requested CamelService, or %NULL
**/
CamelService *
camel_session_get_service_connected (CamelSession *session,
const char *url_string,
CamelProviderType type,
CamelException *ex)
{
CamelService *svc;
svc = camel_session_get_service (session, url_string, type, ex);
if (svc == NULL)
return NULL;
if (svc->connected == FALSE) {
if (camel_service_connect (svc, ex) == FALSE) {
camel_object_unref (CAMEL_OBJECT (svc));
return NULL;
}
}
return svc;
}
/**
* camel_session_get_storage_path:
* @session: session object
* @service: a CamelService
* @ex: a CamelException
*
* This returns the path to a directory which the service can use for
* its own purposes. Data stored there will remain between Evolution
* sessions. No code outside of that service should ever touch the
* files in this directory. If the directory does not exist, it will
* be created.
*
* Return value: the path (which the caller must free), or %NULL if
* an error occurs.
**/
char *
camel_session_get_storage_path (CamelSession *session, CamelService *service,
CamelException *ex)
{
char *path, *p;
p = camel_service_get_path (service);
path = g_strdup_printf ("%s/%s", session->storage_path, p);
g_free (p);
if (access (path, F_OK) == 0)
return path;
if (e_mkdir_hier (path, S_IRWXU) == -1) {
camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
_("Could not create directory %s:\n%s"),
path, g_strerror (errno));
g_free (path);
return NULL;
}
return path;
}
/**
* camel_session_query_authenticator: query the session authenticator
* @session: session object
* @mode: %CAMEL_AUTHENTICATOR_ASK or %CAMEL_AUTHENTICATOR_TELL
* @data: prompt to query user with, or data to cache
* @secret: whether or not the data is secret (eg, a password)
* @service: the service this query is being made by
* @item: an identifier, unique within this service, for the information
* @ex: a CamelException
*
* This function is used by a CamelService to discuss authentication
* information with the application.
*
* @service and @item together uniquely identify the piece of data the
* caller is concerned with.
*
* If @mode is %CAMEL_AUTHENTICATOR_ASK, then @data is a question to
* ask the user (if the application doesn't already have the answer
* cached). If @secret is set, the user's input should not be echoed
* back. The authenticator should set @ex to
* %CAMEL_EXCEPTION_USER_CANCEL if the user did not provide the
* information. The caller must g_free() the information returned when
* it is done with it.
*
* If @mode is %CAMEL_AUTHENTICATOR_TELL, then @data is information
* that the application should cache, or %NULL if it should stop
* caching anything about that datum (eg, because the data is a
* password that turned out to be incorrect).
*
* Return value: the authentication information or %NULL.
**/
char *
camel_session_query_authenticator (CamelSession *session,
CamelAuthCallbackMode mode,
char *prompt, gboolean secret,
CamelService *service, char *item,
CamelException *ex)
{
return session->authenticator (mode, prompt, secret,
service, item, ex);
}
/**
* camel_session_register_timeout: Register a timeout to be called
* periodically.
*
* @session: the CamelSession
* @interval: the number of milliseconds interval between calls
* @callback: the function to call
* @user_data: extra data to be passed to the callback
*
* This function will use the registrar callback provided upon
* camel_session_new to register the timeout. The callback will
* be called every @interval milliseconds until it returns @FALSE.
* It will be passed one argument, @user_data.
*
* Returns a nonzero handle that can be used with
* camel_session_remove_timeout on success, and 0 on failure to
* register the timeout.
**/
guint
camel_session_register_timeout (CamelSession *session,
guint32 interval,
CamelTimeoutCallback callback,
gpointer user_data)
{
g_return_val_if_fail (CAMEL_IS_SESSION (session), FALSE);
return session->registrar (interval, callback, user_data);
}
/**
* camel_session_remove_timeout: Remove a previously registered
* timeout.
*
* @session: the CamelSession
* @handle: a value returned from camel_session_register_timeout
*
* This function will use the remover callback provided upon
* camel_session_new to remove the timeout.
*
* Returns TRUE on success and FALSE on failure.
**/
gboolean
camel_session_remove_timeout (CamelSession *session, guint handle)
{
return session->remover (handle);
}
