/* vfs-create.c - vfs create support in GPGME

   Copyright (C) 2009 g10 Code GmbH

   This file is part of GPGME.

   GPGME is free software; you can redistribute it and/or modify it

   under the terms of the GNU Lesser General Public License as

   published by the Free Software Foundation; either version 2.1 of

   the License, or (at your option) any later version.

   GPGME 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser 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.  */

#if HAVE_CONFIG_H

#include <config.h>

#endif

#include <stdlib.h>

#include <string.h>

#include "gpgme.h"

#include "debug.h"

#include "context.h"

#include "ops.h"

#include "util.h"

static gpgme_error_t

vfs_start (gpgme_ctx_t ctx, int synchronous,

	   const char *command,

	   gpgme_assuan_data_cb_t data_cb,

	   void *data_cb_value,

	   gpgme_assuan_inquire_cb_t inq_cb,

	   void *inq_cb_value,

	   gpgme_assuan_status_cb_t status_cb,

	   void *status_cb_value)

{

  gpgme_error_t err;

  if (!command || !*command)

    return gpg_error (GPG_ERR_INV_VALUE);

  /* The flag value 256 is used to suppress an engine reset.  This is

     required to keep the connection running.  */

  err = _gpgme_op_reset (ctx, ((synchronous & 255) | 256));

  if (err)

    return err;

  return _gpgme_engine_op_assuan_transact (ctx->engine, command,

					   data_cb, data_cb_value,

					   inq_cb, inq_cb_value,

					   status_cb, status_cb_value);

}

#if 0

/* XXXX.  This is the asynchronous variant. */

static gpgme_error_t

gpgme_op_vfs_transact_start (gpgme_ctx_t ctx,

			     const char *command,

			     gpgme_assuan_data_cb_t data_cb,

			     void *data_cb_value,

			     gpgme_assuan_inquire_cb_t inq_cb,

			     void *inq_cb_value,

			     gpgme_assuan_status_cb_t status_cb,

			     void *status_cb_value)

{

  return vfs_start (ctx, 0, command, data_cb, data_cb_value,

		    inq_cb, inq_cb_value, status_cb, status_cb_value);

}

#endif

/* XXXX.  This is the synchronous variant. */

static gpgme_error_t

gpgme_op_vfs_transact (gpgme_ctx_t ctx,

		       const char *command,

		       gpgme_assuan_data_cb_t data_cb,

		       void *data_cb_value,

		       gpgme_assuan_inquire_cb_t inq_cb,

		       void *inq_cb_value,

		       gpgme_assuan_status_cb_t status_cb,

		       void *status_cb_value,

		       gpgme_error_t *op_err)

{

  gpgme_error_t err;

  if (!ctx)

    return gpg_error (GPG_ERR_INV_VALUE);

  err = vfs_start (ctx, 1, command, data_cb, data_cb_value,

		   inq_cb, inq_cb_value, status_cb, status_cb_value);

  if (!err)

    err = _gpgme_wait_one_ext (ctx, op_err);

  return err;

}

/* The actual exported interface follows.  */

/* The container is automatically uncreateed when the context is reset

   or destroyed.  This is a synchronous convenience interface, which

   automatically returns an operation error if there is no

   transmission error.  */

static gpgme_error_t

_gpgme_op_vfs_create (gpgme_ctx_t ctx, gpgme_key_t recp[],

		      const char *container_file, unsigned int flags,

		      gpgme_error_t *op_err)

{

  gpg_error_t err;

  char *cmd;

  char *container_file_esc = NULL;

  int i;

  (void)flags;

  /* We want to encourage people to check error values, so not getting

     them is discouraged here.  Also makes our code easier.  */

  if (! op_err)

    return gpg_error (GPG_ERR_INV_VALUE);

  err = _gpgme_encode_percent_string (container_file, &container_file_esc, 0);

  if (err)

    return err;

  i = 0;

  while (!err && recp[i])

    {

      if (!recp[i]->subkeys || !recp[i]->subkeys->fpr)

	{

	  free (container_file_esc);

	  return gpg_error (GPG_ERR_UNUSABLE_PUBKEY);

	}

      if (gpgrt_asprintf (&cmd, "RECIPIENT %s", recp[i]->subkeys->fpr) < 0)

	{

	  err = gpg_error_from_syserror ();

	  free (container_file_esc);

	  return err;

	}

      err = gpgme_op_vfs_transact (ctx, cmd, NULL, NULL, NULL, NULL,

				   NULL, NULL, op_err);

      gpgrt_free (cmd);

      if (err || *op_err)

	{

	  free (container_file_esc);

	  return err;

	}

      recp++;

    }

  if (gpgrt_asprintf (&cmd, "CREATE -- %s", container_file_esc) < 0)

    {

      err = gpg_error_from_syserror ();

      free (container_file_esc);

      return err;

    }

  free (container_file_esc);

  err = gpgme_op_vfs_transact (ctx, cmd, NULL, NULL, NULL, NULL,

			       NULL, NULL, op_err);

  gpgrt_free (cmd);

  return err;

}

gpgme_error_t

gpgme_op_vfs_create (gpgme_ctx_t ctx, gpgme_key_t recp[],

		      const char *container_file, unsigned int flags,

		      gpgme_error_t *op_err)

{

  gpg_error_t err;

  TRACE_BEG3 (DEBUG_CTX, "gpgme_op_vfs_create", ctx,

	      "container_file=%s, flags=0x%x, op_err=%p",

	      container_file, flags, op_err);

  if (!ctx)

    return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));

  if (_gpgme_debug_trace () && recp)

    {

      int i = 0;

      while (recp[i])

	{

	  TRACE_LOG3 ("recipient[%i] = %p (%s)", i, recp[i],

		      (recp[i]->subkeys && recp[i]->subkeys->fpr) ?

		      recp[i]->subkeys->fpr : "invalid");

	  i++;

	}

    }

  err = _gpgme_op_vfs_create (ctx, recp, container_file, flags, op_err);

  return TRACE_ERR (err);

}