/*
* Copyright 2004 J.F.Dockes
*
* 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 "autoconfig.h"
#include <errno.h>
#include <iostream>
#include <string>
#include <vector>
using namespace std;
#include "cstr.h"
#include "mimehandler.h"
#include "debuglog.h"
#include "rclconfig.h"
#include "smallut.h"
#include "mh_exec.h"
#include "mh_execm.h"
#include "mh_html.h"
#include "mh_mail.h"
#include "mh_mbox.h"
#include "mh_text.h"
#include "mh_unknown.h"
#include "ptmutex.h"
// Performance help: we use a pool of already known and created
// handlers. There can be several instances for a given mime type
// (think email attachment in email message: 2 rfc822 handlers are
// needed simulteanously)
static multimap<string, Dijon::Filter*> o_handlers;
static PTMutexInit o_handlers_mutex;
static const unsigned int max_handlers_cache_size = 300;
/* Look for mime handler in pool */
static Dijon::Filter *getMimeHandlerFromCache(const string& mtype)
{
LOGDEB0(("getMimeHandlerFromCache: %s\n", mtype.c_str()));
PTMutexLocker locker(o_handlers_mutex);
map<string, Dijon::Filter *>::iterator it = o_handlers.find(mtype);
if (it != o_handlers.end()) {
Dijon::Filter *h = it->second;
o_handlers.erase(it);
LOGDEB0(("getMimeHandlerFromCache: %s found\n", mtype.c_str()));
return h;
}
return 0;
}
/* Return mime handler to pool */
void returnMimeHandler(Dijon::Filter *handler)
{
typedef multimap<string, Dijon::Filter*>::value_type value_type;
if (handler) {
handler->clear();
PTMutexLocker locker(o_handlers_mutex);
LOGDEB2(("returnMimeHandler: returning filter for %s cache size %d\n",
handler->get_mime_type().c_str(), o_handlers.size()));
// Limit pool size. It's possible for some reason that the
// handler was not found in the cache by getMimeHandler() and
// that a new handler is returned every time. We don't want
// the cache to grow indefinitely. We try to delete an element
// of the same kind, and if this fails, the first at
// hand. Note that going oversize *should not* normally
// happen, we're only being prudent.
if (o_handlers.size() >= max_handlers_cache_size) {
map<string, Dijon::Filter *>::iterator it =
o_handlers.find(handler->get_mime_type());
if (it != o_handlers.end())
o_handlers.erase(it);
else
o_handlers.erase(o_handlers.begin());
}
o_handlers.insert(value_type(handler->get_mime_type(), handler));
}
}
void clearMimeHandlerCache()
{
LOGDEB(("clearMimeHandlerCache()\n"));
typedef multimap<string, Dijon::Filter*>::value_type value_type;
map<string, Dijon::Filter *>::iterator it;
PTMutexLocker locker(o_handlers_mutex);
for (it = o_handlers.begin(); it != o_handlers.end(); it++) {
delete it->second;
}
o_handlers.clear();
}
/** For mime types set as "internal" in mimeconf:
* create appropriate handler object. */
static Dijon::Filter *mhFactory(RclConfig *config, const string &mime)
{
LOGDEB2(("mhFactory(%s)\n", mime.c_str()));
string lmime(mime);
stringtolower(lmime);
if (cstr_textplain == lmime) {
LOGDEB2(("mhFactory(%s): returning MimeHandlerText\n", mime.c_str()));
return new MimeHandlerText(config, lmime);
} else if ("text/html" == lmime) {
LOGDEB2(("mhFactory(%s): returning MimeHandlerHtml\n", mime.c_str()));
return new MimeHandlerHtml(config, lmime);
} else if ("text/x-mail" == lmime) {
LOGDEB2(("mhFactory(%s): returning MimeHandlerMbox\n", mime.c_str()));
return new MimeHandlerMbox(config, lmime);
} else if ("message/rfc822" == lmime) {
LOGDEB2(("mhFactory(%s): returning MimeHandlerMail\n", mime.c_str()));
return new MimeHandlerMail(config, lmime);
} else if (lmime.find("text/") == 0) {
// Try to handle unknown text/xx as text/plain. This
// only happen if the text/xx was defined as "internal" in
// mimeconf, not at random. For programs, for example this
// allows indexing and previewing as text/plain (no filter
// exec) but still opening with a specific editor.
LOGDEB2(("mhFactory(%s): returning MimeHandlerText(x)\n",mime.c_str()));
return new MimeHandlerText(config, lmime);
} else {
// We should not get there. It means that "internal" was set
// as a handler in mimeconf for a mime type we actually can't
// handle.
LOGERR(("mhFactory: mime type [%s] set as internal but unknown\n",
lmime.c_str()));
return new MimeHandlerUnknown(config, lmime);
}
}
static const string cstr_mh_charset("charset");
/**
* Create a filter that executes an external program or script
* A filter def can look like:
* someprog -v -t " h i j";charset= xx; mimetype=yy
* A semi-colon list of attr=value pairs may come after the exec spec.
* This list is treated by replacing semi-colons with newlines and building
* a confsimple. This is done quite brutally and we don't support having
* a ';' inside a quoted string for now. Can't see a use for it.
*/
MimeHandlerExec *mhExecFactory(RclConfig *cfg, const string& mtype, string& hs,
bool multiple)
{
ConfSimple attrs;
string cmdstr;
if (!cfg->valueSplitAttributes(hs, cmdstr, attrs)) {
LOGERR(("mhExecFactory: bad config line for [%s]: [%s]\n",
mtype.c_str(), hs.c_str()));
return 0;
}
// Split command name and args, and build exec object
list<string> cmdtoks;
stringToStrings(cmdstr, cmdtoks);
if (cmdtoks.empty()) {
LOGERR(("mhExecFactory: bad config line for [%s]: [%s]\n",
mtype.c_str(), hs.c_str()));
return 0;
}
MimeHandlerExec *h = multiple ?
new MimeHandlerExecMultiple(cfg, mtype.c_str()) :
new MimeHandlerExec(cfg, mtype.c_str());
list<string>::iterator it = cmdtoks.begin();
h->params.push_back(cfg->findFilter(*it++));
h->params.insert(h->params.end(), it, cmdtoks.end());
// Handle additional attributes. We substitute the semi-colons
// with newlines and use a ConfSimple
string value;
if (attrs.get(cstr_mh_charset, value))
h->cfgFilterOutputCharset = stringtolower((const string&)value);
if (attrs.get(cstr_dj_keymt, value))
h->cfgFilterOutputMtype = stringtolower((const string&)value);
#if 0
string scmd;
for (it = h->params.begin(); it != h->params.end(); it++) {
scmd += string("[") + *it + "] ";
}
LOGDEB(("mhExecFactory:mt [%s] cfgmt [%s] cfgcs [%s] cmd: [%s]\n",
mtype.c_str(), h->cfgFilterOutputMtype.c_str(), h->cfgFilterOutputCharset.c_str(),
scmd.c_str()));
#endif
return h;
}
/* Get handler/filter object for given mime type: */
Dijon::Filter *getMimeHandler(const string &mtype, RclConfig *cfg,
bool filtertypes)
{
LOGDEB(("getMimeHandler: mtype [%s] filtertypes %d\n",
mtype.c_str(), filtertypes));
Dijon::Filter *h = 0;
// Get handler definition for mime type. We do this even if an
// appropriate handler object may be in the cache (indexed by mime
// type). This is fast, and necessary to conform to the
// configuration, (ie: text/html might be filtered out by
// indexedmimetypes but an html handler could still be in the
// cache because it was needed by some other interning stack).
string hs;
hs = cfg->getMimeHandlerDef(mtype, filtertypes);
if (!hs.empty()) { // Got a handler definition line
// Do we already have a handler object in the cache ?
h = getMimeHandlerFromCache(mtype);
if (h != 0)
goto out;
LOGDEB2(("getMimeHandler: %s not in cache\n", mtype.c_str()));
// Not in cache. Break definition into type and name/command
// string and instanciate handler object
string::size_type b1 = hs.find_first_of(" \t");
string handlertype = hs.substr(0, b1);
string cmdstr;
if (b1 != string::npos) {
cmdstr = hs.substr(b1);
trimstring(cmdstr);
}
if (!stringlowercmp("internal", handlertype)) {
// If there is a parameter after "internal" it's the mime
// type to use. This is so that we can have bogus mime
// types like text/x-purple-html-log (for ie: specific
// icon) and still use the html filter on them. This is
// partly redundant with the localfields/rclaptg, but
// better and the latter will probably go away at some
// point in the future.
LOGDEB2(("handlertype internal, cmdstr [%s]\n", cmdstr.c_str()));
if (!cmdstr.empty()) {
// Have to redo the cache thing. Maybe we should
// rather just recurse instead ?
if ((h = getMimeHandlerFromCache(cmdstr)) == 0)
h = mhFactory(cfg, cmdstr);
} else {
h = mhFactory(cfg, mtype);
}
goto out;
} else if (!stringlowercmp("dll", handlertype)) {
} else {
if (cmdstr.empty()) {
LOGERR(("getMimeHandler: bad line for %s: %s\n",
mtype.c_str(), hs.c_str()));
goto out;
}
if (!stringlowercmp("exec", handlertype)) {
h = mhExecFactory(cfg, mtype, cmdstr, false);
goto out;
} else if (!stringlowercmp("execm", handlertype)) {
h = mhExecFactory(cfg, mtype, cmdstr, true);
goto out;
} else {
LOGERR(("getMimeHandler: bad line for %s: %s\n",
mtype.c_str(), hs.c_str()));
goto out;
}
}
}
// We get here if there was no specific error, but there is no
// identified mime type, or no handler associated.
#ifdef INDEX_UNKNOWN_TEXT_AS_PLAIN
// If the type is an unknown text/xxx, index as text/plain and
// hope for the best (this wouldn't work too well with text/rtf...)
if (mtype.find("text/") == 0) {
h = mhFactory(cstr_textplain);
goto out;
}
#endif
// Finally, unhandled files are either ignored or their name and
// generic metadata is indexed, depending on configuration
{bool indexunknown = false;
cfg->getConfParam("indexallfilenames", &indexunknown);
if (indexunknown) {
h = new MimeHandlerUnknown(cfg, "application/octet-stream");
goto out;
} else {
goto out;
}
}
out:
if (h) {
string charset = cfg->getDefCharset();
h->set_property(Dijon::Filter::DEFAULT_CHARSET, charset);
}
return h;
}
/// Can this mime type be interned (according to config) ?
bool canIntern(const std::string mtype, RclConfig *cfg)
{
if (mtype.empty())
return false;
string hs = cfg->getMimeHandlerDef(mtype);
if (hs.empty())
return false;
return true;
}