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/* delkey.c - delete keys
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004,
* 2005 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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <ctype.h>

#include "options.h"
#include "packet.h"
#include "errors.h"
#include "iobuf.h"
#include "keydb.h"
#include "memory.h"
#include "util.h"
#include "main.h"
#include "trustdb.h"
#include "filter.h"
#include "ttyio.h"
#include "status.h"
#include "i18n.h"


/****************
* Delete a public or secret key from a keyring.
* r_sec_avail will be set if a secret key is available and the public
* key can't be deleted for that reason.
*/
static int
do_delete_key( const char *username, int secret, int force, int *r_sec_avail )
{
    int rc = 0;
    KBNODE keyblock = NULL;
    KBNODE node;
    KEYDB_HANDLE hd = keydb_new (secret);
    PKT_public_key *pk = NULL;
    PKT_secret_key *sk = NULL;
    u32 keyid[2];
    int okay=0;
    int yes;
    KEYDB_SEARCH_DESC desc;
    int exactmatch;

    *r_sec_avail = 0;

    /* search the userid */
    classify_user_id (username, &desc);
    exactmatch = (desc.mode == KEYDB_SEARCH_MODE_FPR
                  || desc.mode == KEYDB_SEARCH_MODE_FPR16
                  || desc.mode == KEYDB_SEARCH_MODE_FPR20);
    rc = desc.mode? keydb_search (hd, &desc, 1):G10ERR_INV_USER_ID;
    if (rc) {
log_error (_("key \"%s\" not found: %s\n"), username, g10_errstr (rc));
write_status_text( STATUS_DELETE_PROBLEM, "1" );
goto leave;
    }

    /* read the keyblock */
    rc = keydb_get_keyblock (hd, &keyblock );
    if (rc) {
log_error (_("error reading keyblock: %s\n"), g10_errstr(rc) );
goto leave;
    }

    /* get the keyid from the keyblock */
    node = find_kbnode( keyblock, secret? PKT_SECRET_KEY:PKT_PUBLIC_KEY );
    if( !node ) {
log_error("Oops; key not found anymore!\n");
rc = G10ERR_GENERAL;
goto leave;
    }

    if( secret )
      {
sk = node->pkt->pkt.secret_key;
keyid_from_sk( sk, keyid );
      }
    else
      {
/* public */
pk = node->pkt->pkt.public_key;
keyid_from_pk( pk, keyid );

if(!force)
{
rc = seckey_available( keyid );
if( !rc )
{
*r_sec_avail = 1;
rc = -1;
goto leave;
}
else if( rc != G10ERR_NO_SECKEY )
log_error("%s: get secret key: %s\n", username, g10_errstr(rc) );
else
rc = 0;
}
      }

    if( rc )
rc = 0;
    else if (opt.batch && exactmatch)
        okay++;
    else if( opt.batch && secret )
      {
log_error(_("can't do this in batch mode\n"));
        log_info (_("(unless you specify the key by fingerprint)\n"));
      }
    else if( opt.batch && opt.answer_yes )
okay++;
    else if( opt.batch )
      {
log_error(_("can't do this in batch mode without \"--yes\"\n"));
        log_info (_("(unless you specify the key by fingerprint)\n"));
      }
    else {
        if( secret )
            print_seckey_info( sk );
        else
            print_pubkey_info(NULL, pk );
tty_printf( "\n" );

yes = cpr_get_answer_is_yes( secret? "delete_key.secret.okay"
: "delete_key.okay",
_("Delete this key from the keyring? (y/N) "));
if( !cpr_enabled() && secret && yes ) {
/* I think it is not required to check a passphrase; if
* the user is so stupid as to let others access his secret keyring
* (and has no backup) - it is up him to read some very
* basic texts about security.
*/
yes = cpr_get_answer_is_yes("delete_key.secret.okay",
_("This is a secret key! - really delete? (y/N) "));
}
if( yes )
okay++;
    }


    if( okay ) {
rc = keydb_delete_keyblock (hd);
if (rc) {
log_error (_("deleting keyblock failed: %s\n"), g10_errstr(rc) );
goto leave;
}

/* Note that the ownertrust being cleared will trigger a
revalidation_mark(). This makes sense - only deleting keys
that have ownertrust set should trigger this. */

        if (!secret && pk && clear_ownertrusts (pk)) {
          if (opt.verbose)
            log_info (_("ownertrust information cleared\n"));
        }
    }

  leave:
    keydb_release (hd);
    release_kbnode (keyblock);
    return rc;
}

/****************
* Delete a public or secret key from a keyring.
*/
int
delete_keys( STRLIST names, int secret, int allow_both )
{
    int rc, avail, force=(!allow_both && !secret && opt.expert);

    /* Force allows us to delete a public key even if a secret key
exists. */

    for(;names;names=names->next) {
       rc = do_delete_key (names->d, secret, force, &avail );
       if ( rc && avail ) {
if ( allow_both ) {
rc = do_delete_key (names->d, 1, 0, &avail );
if ( !rc )
rc = do_delete_key (names->d, 0, 0, &avail );
}
else {
log_error(_(
"there is a secret key for public key \"%s\"!\n"),names->d);
log_info(_(
"use option \"--delete-secret-keys\" to delete it first.\n"));
write_status_text( STATUS_DELETE_PROBLEM, "2" );
return rc;
}
       }

       if(rc) {
log_error("%s: delete key failed: %s\n", names->d, g10_errstr(rc) );
return rc;
       }
    }

    return 0;
}
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