/*
** Proxy and Gateway BEFORE filter
** -------------------------------
** Checks for registerd proxy servers or gateways and sees whether this
** request should be redirected to a proxy or a gateway. Proxies have
** higher priority than gateways so we look for them first!
** For HTTP/1.0 and HTTP/1.1 we may only send a full URL (including the
** host portion) to proxy servers. Therefore, we tell the Library whether
** to use the full URL or the traditional HTTP one without the host part.
*/
PUBLIC int HTProxyFilter (HTRequest * request, void * param, int mode)
{
HTParentAnchor * anchor = HTRequest_anchor(request);
char * addr = HTAnchor_physical(anchor);
char * physical = NULL;
if ((physical = HTProxy_find(addr))) {
HTRequest_setFullURI(request, YES); /* For now */
HTRequest_setProxy(request, physical);
HT_FREE(physical);
#if 0
/* Don't paste the URLs together anymore */
StrAllocCat(physical, addr);
HTAnchor_setPhysical(anchor, physical);
#endif
} else if ((physical = HTGateway_find(addr))) {
/*
** A gateway URL is crated by chopping off any leading "/" to make the
** host into part of path
*/
char * path =
HTParse(addr, "", PARSE_HOST + PARSE_PATH + PARSE_PUNCTUATION);
char * gatewayed = HTParse((*path=='/') ? path+1 : path, physical, PARSE_ALL);
HTAnchor_setPhysical(anchor, gatewayed);
HT_FREE(path);
HT_FREE(gatewayed);
HTRequest_setFullURI(request, NO);
HTRequest_deleteProxy(request);
} else {
HTRequest_setFullURI(request, NO); /* For now */
HTRequest_deleteProxy(request);
}
return HT_OK;
}
/*
** Rule Translation BEFORE Filter
** ------------------------------
** If we have a set of rules loaded (see the Rule manager) then check
** before each request whether how that should be translated. The trick
** is that a parent anchor has a "address" which is the part from the URL
** we used when we created the anchor. However, it also have a "physical
** address" which is the place we are actually going to look for the
** resource. Hence this filter translates the physical address
** (if any translations are found)
*/
PUBLIC int HTRuleFilter (HTRequest * request, void * param, int mode)
{
HTList * list = HTRule_global();
HTParentAnchor * anchor = HTRequest_anchor(request);
char * addr = HTAnchor_physical(anchor);
char * physical = HTRule_translate(list, addr, NO);
if (!physical) {
HTRequest_addError(request, ERR_FATAL, NO, HTERR_FORBIDDEN,
NULL, 0, "HTRuleFilter");
return HT_ERROR;
}
HTAnchor_setPhysical(anchor, physical);
HT_FREE(physical);
return HT_OK;
}
/*
** A small BEFORE filter that just finds a cache entry unconditionally
** and loads the entry. All freshness and any other constraints are
** ignored.
*/
PRIVATE int HTCacheLoadFilter (HTRequest * request, void * param, int mode)
{
HTParentAnchor * anchor = HTRequest_anchor(request);
char * default_name;
HTCache * cache;
default_name = HTRequest_defaultPutName (request);
cache = HTCache_find(anchor, default_name);
HTTRACE(STREAM_TRACE, "Cache Load.. loading partial cache entry\n");
if (cache) {
char * name = HTCache_name(cache);
HTAnchor_setPhysical(anchor, name);
HTCache_addHit(cache);
HT_FREE(name);
}
return HT_OK;
}
PRIVATE int FileEvent (SOCKET soc, void * pVoid, HTEventType type)
{
file_info *file = pVoid; /* Specific access information */
int status = HT_ERROR;
HTNet * net = file->net;
HTRequest * request = HTNet_request(net);
HTParentAnchor * anchor = HTRequest_anchor(request);
/*
** Initiate a new file structure and bind to request structure
** This is actually state FILE_BEGIN, but it can't be in the state
** machine as we need the structure first.
*/
if (type == HTEvent_CLOSE) { /* Interrupted */
HTRequest_addError(request, ERR_FATAL, NO, HTERR_INTERRUPTED,
NULL, 0, "HTLoadFile");
FileCleanup(request, HT_INTERRUPTED);
return HT_OK;
}
/* Now jump into the machine. We know the state from the previous run */
while (1) {
switch (file->state) {
case FS_BEGIN:
/* We only support safe (GET, HEAD, etc) methods for the moment */
if (!HTMethod_isSafe(HTRequest_method(request))) {
HTRequest_addError(request, ERR_FATAL, NO, HTERR_NOT_ALLOWED,
NULL, 0, "HTLoadFile");
file->state = FS_ERROR;
break;
}
/* Check whether we have access to local disk at all */
if (HTLib_secure()) {
HTTRACE(PROT_TRACE, "LoadFile.... No access to local file system\n");
file->state = FS_TRY_FTP;
break;
}
file->local = HTWWWToLocal(HTAnchor_physical(anchor), "",
HTRequest_userProfile(request));
if (!file->local) {
file->state = FS_TRY_FTP;
break;
}
/* Create a new host object and link it to the net object */
{
HTHost * host = NULL;
if ((host = HTHost_new("localhost", 0)) == NULL) return HT_ERROR;
HTNet_setHost(net, host);
if (HTHost_addNet(host, net) == HT_PENDING) {
HTTRACE(PROT_TRACE, "HTLoadFile.. Pending...\n");
/* move to the hack state */
file->state = FS_PENDING;
return HT_OK;
}
}
file->state = FS_DO_CN;
break;
case FS_PENDING:
/*
** 2000/08/10 JK : This is a funny state. Because of the
** internal libwww stacks, when doing multiple local
** requests (e.g., while using the Robot), we need to ask
** again for the host object. If we had jumped directly to
** the FS_DO_CN state, libwww would have blocked because
** of socket starvation.
** This state is similar to FS_BEGINNING, but just requests
** the host object.
** YES. THIS IS AN UGLY HACK!!
*/
{
HTHost * host = NULL;
if ((host = HTHost_new("localhost", 0)) == NULL) return HT_ERROR;
HTNet_setHost(net, host);
if (HTHost_addNet(host, net) == HT_PENDING) {
HTTRACE(PROT_TRACE, "HTLoadFile.. Pending...\n");
file->state = FS_PENDING;
return HT_OK;
}
}
file->state = FS_DO_CN;
break;
case FS_DO_CN:
/*
** If we have to do content negotiation then find the object that
** fits best into either what the client has indicated in the
** accept headers or what the client has registered on its own.
** The object chosen can in fact be a directory! However, content
** negotiation only makes sense if we can read the directory!
** We stat the file in order to find the size and to see it if
** exists.
*/
if (HTRequest_negotiation(request) &&
HTMethod_isSafe(HTRequest_method(request))) {
char * conneg = HTMulti(request, file->local,&file->stat_info);
if (conneg) {
HT_FREE(file->local);
file->local = conneg;
HTAnchor_setPhysical(anchor, conneg);
HTTRACE(PROT_TRACE, "Load File... Found `%s\'\n" _ conneg);
} else {
HTTRACE(PROT_TRACE, "Load File... Not found - even tried content negotiation\n");
HTRequest_addError(request, ERR_FATAL, NO, HTERR_NOT_FOUND,
NULL, 0, "HTLoadFile");
file->state = FS_ERROR;
break;
}
} else {
if (HT_STAT(file->local, &file->stat_info) == -1) {
HTTRACE(PROT_TRACE, "Load File... Not found `%s\'\n" _ file->local);
HTRequest_addError(request, ERR_FATAL, NO, HTERR_NOT_FOUND,
NULL, 0, "HTLoadFile");
file->state = FS_ERROR;
break;
}
}
/*
** Check to see if the 'localname' is in fact a directory.
** Note that we can't do a HEAD on a directory
*/
if (((file->stat_info.st_mode) & S_IFMT) == S_IFDIR) {
if (HTRequest_method(request) == METHOD_GET)
file->state = FS_PARSE_DIR;
else {
HTRequest_addError(request, ERR_INFO, NO, HTERR_NO_CONTENT,
NULL, 0, "HTLoadFile");
file->state = FS_NO_DATA;
}
break;
}
/*
** If empty file then only serve it if it is editable. We also get
** the bindings for the file suffixes in lack of better bindings
*/
{
BOOL editable = HTEditable(file->local, &file->stat_info);
if (file_suffix_binding) HTBind_getAnchorBindings(anchor);
if (editable) HTAnchor_appendAllow(anchor, METHOD_PUT);
/* Set the file size */
if (file->stat_info.st_size)
HTAnchor_setLength(anchor, file->stat_info.st_size);
/* Set the file last modified time stamp */
if (file->stat_info.st_mtime > 0)
HTAnchor_setLastModified(anchor, file->stat_info.st_mtime);
/* Check to see if we can edit it */
if (!editable && !file->stat_info.st_size) {
HTRequest_addError(request, ERR_INFO, NO, HTERR_NO_CONTENT,
NULL, 0, "HTLoadFile");
file->state = FS_NO_DATA;
} else {
file->state = (HTRequest_method(request)==METHOD_GET) ?
FS_NEED_OPEN_FILE : FS_GOT_DATA;
}
}
break;
case FS_NEED_OPEN_FILE:
status = HTFileOpen(net, file->local, HT_FB_RDONLY);
if (status == HT_OK) {
/*
** Create the stream pipe FROM the channel to the application.
** The target for the input stream pipe is set up using the
** stream stack.
*/
{
HTStream * rstream = HTStreamStack(HTAnchor_format(anchor),
HTRequest_outputFormat(request),
HTRequest_outputStream(request),
request, YES);
HTNet_setReadStream(net, rstream);
HTRequest_setOutputConnected(request, YES);
}
/*
** Create the stream pipe TO the channel from the application
** and hook it up to the request object
*/
{
HTOutputStream * output = HTNet_getOutput(net, NULL, 0);
HTRequest_setInputStream(request, (HTStream *) output);
}
/*
** Set up concurrent read/write if this request isn't the
** source for a PUT or POST. As source we don't start reading
** before all destinations are ready. If destination then
** register the input stream and get ready for read
*/
if (HTRequest_isSource(request) && !HTRequest_destinationsReady(request))
return HT_OK;
HTRequest_addError(request, ERR_INFO, NO, HTERR_OK, NULL, 0,
"HTLoadFile");
file->state = FS_NEED_BODY;
/* If we are _not_ using preemptive mode and we are Unix fd's
** then return here to get the same effect as when we are
** connecting to a socket. That way, HTFile acts just like any
** other protocol module even though we are in fact doing
** blocking connect
*/
if (HTEvent_isCallbacksRegistered()) {
if (!HTRequest_preemptive(request)) {
if (!HTNet_preemptive(net)) {
HTTRACE(PROT_TRACE, "HTLoadFile.. Returning\n");
HTHost_register(HTNet_host(net), net, HTEvent_READ);
} else if (!file->timer) {
HTTRACE(PROT_TRACE, "HTLoadFile.. Returning\n");
file->timer =
HTTimer_new(NULL, ReturnEvent, file, 1, YES, NO);
}
return HT_OK;
}
}
} else if (status == HT_WOULD_BLOCK || status == HT_PENDING)
return HT_OK;
else {
HTRequest_addError(request, ERR_INFO, NO, HTERR_INTERNAL,
NULL, 0, "HTLoadFile");
file->state = FS_ERROR; /* Error or interrupt */
}
break;
case FS_NEED_BODY:
status = HTHost_read(HTNet_host(net), net);
if (status == HT_WOULD_BLOCK)
return HT_OK;
else if (status == HT_LOADED || status == HT_CLOSED) {
file->state = FS_GOT_DATA;
} else {
HTRequest_addError(request, ERR_INFO, NO, HTERR_FORBIDDEN,
NULL, 0, "HTLoadFile");
file->state = FS_ERROR;
}
break;
case FS_PARSE_DIR:
status = HTFile_readDir(request, file);
if (status == HT_LOADED)
file->state = FS_GOT_DATA;
else
file->state = FS_ERROR;
break;
case FS_TRY_FTP:
{
char *url = HTAnchor_physical(anchor);
HTAnchor *anchor;
char *newname = NULL;
StrAllocCopy(newname, "ftp:");
if (!strncmp(url, "file:", 5))
StrAllocCat(newname, url+5);
else
StrAllocCat(newname, url);
anchor = HTAnchor_findAddress(newname);
HTRequest_setAnchor(request, anchor);
HT_FREE(newname);
FileCleanup(request, HT_IGNORE);
return HTLoad(request, YES);
}
break;
case FS_GOT_DATA:
FileCleanup(request, HT_LOADED);
return HT_OK;
break;
case FS_NO_DATA:
FileCleanup(request, HT_NO_DATA);
return HT_OK;
break;
case FS_RETRY:
FileCleanup(request, HT_RETRY);
return HT_OK;
break;
case FS_ERROR:
FileCleanup(request, HT_ERROR);
return HT_OK;
break;
}
} /* End of while(1) */
}
