/* hkp.c  -  Horrowitz Keyserver Protocol
 *	Copyright (C) 1999 Free Software Foundation, Inc.
 *
 * This file is part of GnuPG.
 *
 * GnuPG 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.
 *
 * GnuPG 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <assert.h>

#include "errors.h"
#include "util.h"
#include "ttyio.h"
#include "i18n.h"
#include <gcrypt.h>
#include "options.h"
#include "filter.h"
#include "http.h"
#include "main.h"

static int urlencode_filter( void *opaque, int control,
			     IOBUF a, byte *buf, size_t *ret_len);

/****************
 * Try to import the key with KEYID from a keyserver but ask the user
 * before doing so.
 * Returns: 0 the key was successfully imported
 *	    -1 key not found on server or user does not want to
 *	       import the key
 *	    or other error codes.
 */
int
hkp_ask_import( u32 *keyid )
{
  #ifdef HAVE_DOSISH_SYSTEM
    return -1;
  #else
    struct http_context hd;
    char *request;
    int rc;

    if( !opt.keyserver_name )
	return -1;
    log_info("requesting key %08lX from %s ...\n", (ulong)keyid[1],
						   opt.keyserver_name );
    request = gcry_xmalloc( strlen( opt.keyserver_name ) + 100 );
    /* hkp does not accept the long keyid - we should really write a
     * nicer one */
    sprintf( request, "x-hkp://%s:11371/pks/lookup?op=get&search=0x%08lX",
			opt.keyserver_name, (ulong)keyid[1] );
    rc = http_open_document( &hd, request, 0 );
    if( rc ) {
	log_info("can't get key from keyserver: %s\n",
			rc == GPGERR_NETWORK? strerror(errno)
					    : gpg_errstr(rc) );
    }
    else {
	rc = import_keys_stream( hd.fp_read , 0 );
	http_close( &hd );
    }

    gcry_free( request );
    return rc;
  #endif
}



int
hkp_import( STRLIST users )
{
  #ifdef HAVE_DOSISH_SYSTEM
    return -1;
  #else
    if( !opt.keyserver_name ) {
	log_error("no keyserver known (use option --keyserver)\n");
	return -1;
    }

    for( ; users; users = users->next ) {
	u32 kid[2];
	int type = classify_user_id( users->d, kid, NULL, NULL, NULL );
	if( type != 10 && type != 11 ) {
	    log_info("%s: not a valid key ID\n", users->d );
	    continue;
	}
	hkp_ask_import( kid );
    }
    return 0;
  #endif
}


int
hkp_export( STRLIST users )
{
  #ifdef HAVE_DOSISH_SYSTEM
    return -1;
  #else
    int rc;
    armor_filter_context_t afx;
    IOBUF temp = iobuf_temp();
    struct http_context hd;
    char *request;
    unsigned int status;

    if( !opt.keyserver_name ) {
	log_error("no keyserver known (use option --keyserver)\n");
	return -1;
    }

    iobuf_push_filter( temp, urlencode_filter, NULL );

    memset( &afx, 0, sizeof afx);
    afx.what = 1;
    iobuf_push_filter( temp, armor_filter, &afx );

    rc = export_pubkeys_stream( temp, users, 1 );
    if( rc == -1 ) {
	iobuf_close(temp);
	return 0;
    }

    iobuf_flush_temp( temp );

    request = gcry_xmalloc( strlen( opt.keyserver_name ) + 100 );
    sprintf( request, "x-hkp://%s:11371/pks/add", opt.keyserver_name );
    rc = http_open( &hd, HTTP_REQ_POST, request , 0 );
    if( rc ) {
	log_error("can't connect to `%s': %s\n",
		   opt.keyserver_name,
			rc == GPGERR_NETWORK? strerror(errno)
					    : gpg_errstr(rc) );
	iobuf_close(temp);
	gcry_free( request );
	return rc;
    }

    sprintf( request, "Content-Length: %u\n",
		      (unsigned)iobuf_get_temp_length(temp) + 9 );
    iobuf_writestr( hd.fp_write, request );
    gcry_free( request );
    http_start_data( &hd );

    iobuf_writestr( hd.fp_write, "keytext=" );
    iobuf_write( hd.fp_write, iobuf_get_temp_buffer(temp),
			      iobuf_get_temp_length(temp) );
    iobuf_put( hd.fp_write, '\n' );
    iobuf_flush_temp( temp );
    iobuf_close(temp);

    rc = http_wait_response( &hd, &status );
    if( rc ) {
	log_error("error sending to `%s': %s\n",
		   opt.keyserver_name, gpg_errstr(rc) );
    }
    else {
      #if 1
	if( opt.verbose ) {
	    int c;
	    while( (c=iobuf_get(hd.fp_read)) != EOF )
		putchar( c );
	}
      #endif
	if( (status/100) == 2 )
	    log_info("success sending to `%s' (status=%u)\n",
					opt.keyserver_name, status  );
	else
	    log_error("failed sending to `%s': status=%u\n",
					opt.keyserver_name, status  );
    }
    http_close( &hd );
    return rc;
  #endif
}

static int
urlencode_filter( void *opaque, int control,
		  IOBUF a, byte *buf, size_t *ret_len)
{
    size_t size = *ret_len;
    int rc=0;

    if( control == IOBUFCTRL_FLUSH ) {
	const byte *p;
	for(p=buf; size; p++, size-- ) {
	    if( isalnum(*p) || *p == '-' )
		iobuf_put( a, *p );
	    else if( *p == ' ' )
		iobuf_put( a, '+' );
	    else {
		char numbuf[5];
		sprintf(numbuf, "%%%02X", *p );
		iobuf_writestr(a, numbuf );
	    }
	}
    }
    else if( control == IOBUFCTRL_DESC )
	*(char**)buf = "urlencode_filter";
    return rc;
}