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/* wydawca - automatic release submission daemon
   Copyright (C) 2007, 2008, 2009, 2010 Sergey Poznyakoff

   Wydawca 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.

   Wydawca 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 wydawca. If not, see <http://www.gnu.org/licenses/>. */

#include "wydawca.h"
#include <mail.h>
#include <hash.h>
#include <gpgme.h>

int mailer_opened;
mu_mailer_t mailer;
mu_address_t admin_address;
mu_address_t from_address;
unsigned long mail_admin_mask;
unsigned long owner_notification_flags;
char *user_message_template[MAX_EVENT];

char *admin_stat_message;
char *admin_stat_sign_key;

void
mail_init ()
{
  if (!mailer)
    {
      int rc;
      if ((rc = mu_mailer_create (&mailer, NULL)))
	{
	  const char *url = NULL;
	  mu_mailer_get_url_default (&url);
	  logmsg (LOG_ERR, _("cannot create default mailer `%s': %s"),
		  url, mu_strerror (rc));
	}
    }
}

struct mu_stream_handle
{
  mu_stream_t str;
  mu_off_t off;
};

static ssize_t
mu_stream_data_read_cb (void *handle, void *buffer, size_t size)
{
  struct mu_stream_handle *mhp = handle;
  size_t nread;
  int rc;

  rc = mu_stream_read (mhp->str, buffer, size, mhp->off, &nread);
  if (rc)
    {
      logmsg (LOG_ERR, "mu_stream_read: %s", mu_strerror (rc));
      errno = EIO;
      return -1;
    }

  mhp->off += nread;
  return nread;
}

static int
check_sign_result (gpgme_sign_result_t result, gpgme_sig_mode_t type)
{
  gpgme_new_signature_t sign;
  
  if (result->invalid_signers)
    {
      logmsg (LOG_ERR, _("GPGME: invalid signer found: %s"),
	      result->invalid_signers->fpr);
      return 1;
    }

  if (!result->signatures)
    {
      logmsg (LOG_ERR, _("GPGME: no signatures created"));
      return 1;
    }

  for (sign = result->signatures; sign; sign = sign->next)
    {
      if (sign->type != type)
	{
	  logmsg (LOG_ERR, _("GPGME: wrong type of signature created"));
	  return 1;
	}
    }
  /* FIXME: fingerprint? */
  return 0;
}

  
static int
gpg_sign (gpgme_data_t *output, gpgme_data_t input, const char *sign_keys)
{
  gpgme_ctx_t ctx;
  gpgme_error_t err = 0;
  gpgme_key_t key;
  int ret;
  
  err = gpgme_new (&ctx);
  if (err)
    {
      logmsg (LOG_ERR, _("GPGME: cannot create context: %s"),
	      gpgme_strerror (err));
      return 1;
    }
  
  err = gpgme_op_keylist_start (ctx, sign_keys, 0);
  if (!err)
    {
      while ((err = gpgme_op_keylist_next (ctx, &key)) == 0)
	{
	  err = gpgme_signers_add (ctx, key);
	  gpgme_key_release (key);
	}
    }

  if (err && gpg_err_code (err) != GPG_ERR_EOF)
    {
      logmsg (LOG_ERR, _("GPGME: cannot list keys: %s"),
	      gpgme_strerror (err));
      gpgme_release (ctx);
      return 1;
    }

  err = gpgme_data_new (output);
  if (err)
    {
      logmsg (LOG_ERR, _("%s: GPGME error: %s"),
	      "gpgme_data_new",
	      gpgme_strerror (err));
      gpgme_release (ctx);
      return 1;
    }
  
  /* FIXME: Passphrase */
  gpgme_set_textmode (ctx, 1);
  gpgme_set_armor (ctx, 1);

  err = gpgme_op_sign (ctx, input, *output, GPGME_SIG_MODE_CLEAR);
  if (err)
    {
      logmsg (LOG_ERR, _("%s: GPGME error: %s"),
	      "gpgme_op_sign",
	      gpgme_strerror (err));
      ret = 1;
    }
  else
    {
      ret = check_sign_result (gpgme_op_sign_result (ctx),
			       GPGME_SIG_MODE_CLEAR);
#if 0
  /* FIXME: */
      if (debug_level > 1)
	gpgme_debug_info (ctx);
#endif
    }
  
  gpgme_release (ctx);
  return ret;
}

static int
sign_message (mu_message_t *pmsg, const char *key)
{
  mu_message_t msg = *pmsg;
  mu_message_t newmsg;
  mu_body_t body;
  mu_header_t hdr;
  struct mu_stream_handle mhn;
  mu_stream_t istr, ostr;
  int rc;
  struct gpgme_data_cbs cbs;
  gpgme_data_t input, output;
  gpgme_error_t err;
  char *buf = NULL;
  size_t size = 0;
  size_t nread;

  if (debug_level)
    logmsg (LOG_DEBUG, _("signing message as %s"), key);
  
  if (wydawca_gpg_homedir)
    {
      if (debug_level > 1)
	logmsg (LOG_DEBUG, _("setting GNUPG home directory: %s"),
		wydawca_gpg_homedir);
      setenv ("GNUPGHOME", wydawca_gpg_homedir, 1);
    }
  
  if ((rc = mu_message_get_body (msg, &body)))
    {
      logmsg (LOG_ERR, "mu_message_get_body: %s", mu_strerror (rc));
      return 1;
    }

  if ((rc = mu_body_get_stream (body, &mhn.str)))
    {
      logmsg (LOG_ERR, "mu_message_get_stream: %s", mu_strerror (rc));
      return 1;
    }

  mu_stream_seek (mhn.str, 0, SEEK_SET);
  mhn.off = 0;

  memset (&cbs, 0, sizeof (cbs));
  cbs.read = mu_stream_data_read_cb;

  err = gpgme_data_new_from_cbs (&input, &cbs, &mhn);
  if (err)
    {
      logmsg (LOG_ERR, "gpgme_data_new_from_cbs: %s",
	      gpgme_strerror (rc));
      return 1;
    }

  rc = gpg_sign (&output, input, key);
  if (rc)
    return 1;
  
  if (gpgme_data_seek (output, 0, SEEK_SET) == -1)
    {
      logmsg (LOG_ERR, "gpgme_data_seek: %s", strerror (errno));
      return 1;
    }
      
  mu_message_create (&newmsg, NULL);
  mu_message_get_stream (newmsg, &ostr);

  /* Copy headers */
  mu_message_get_header (msg, &hdr);
  mu_header_get_stream (hdr, &istr);
  mu_stream_seek (istr, 0, SEEK_SET);
  while ((rc = mu_stream_sequential_getline (istr, &buf, &size, &nread)) == 0
	 && nread)
    {
      rc = mu_stream_sequential_write (ostr, buf, nread);
      if (rc)
	{
	  logmsg (LOG_ERR, "mu_stream_sequential_write: %s",
		  mu_strerror (rc));
	  break;
	}
    }

  if (rc == 0)
    {
      while ((nread = gpgme_data_read (output, buf, size)) > 0)
	{
	  rc = mu_stream_sequential_write (ostr, buf, nread);
	  if (rc)
	    {
	      logmsg (LOG_ERR, "mu_stream_sequential_write: %s",
		      mu_strerror (rc));
	      break;
	    }
	}

      if (rc == 0)
	{
	  mu_message_destroy (&msg, mu_message_get_owner (msg));
	  *pmsg = newmsg;
	}
    }
  
  if (rc)
    mu_message_destroy (&newmsg, mu_message_get_owner (msg));
  gpgme_data_release (output);
  free (buf);

  return rc;
}

void
mail_send_message (mu_address_t rcpt, const char *text,
		   const char *signer_key)
{
  int rc;
  mu_message_t msg;
  mu_stream_t stream = NULL;
  mu_header_t hdr;
  int mailer_flags = 0;
  static char *x_mailer = "wydawca (" PACKAGE_STRING ")";
  size_t size;
  char *buf;
  const char *sval;
  
  mu_message_create (&msg, NULL);

  mu_message_get_stream (msg, &stream);
  mu_stream_write (stream, text, strlen (text), 0, NULL);
  mu_message_get_header (msg, &hdr);
  mu_header_append (hdr, "X-Mailer", x_mailer);

  if (rcpt)
    {
      mu_address_to_string (rcpt, NULL, 0, &size);
      buf = xmalloc (size + 1);
      mu_address_to_string (rcpt, buf, size + 1, NULL);

      mu_header_set_value (hdr, "To", buf, 1);
      free (buf);

      if (from_address && mu_header_sget_value (hdr, "From", &sval))
	{
	  mu_address_to_string (from_address, NULL, 0, &size);
	  buf = xmalloc (size + 1);
	  mu_address_to_string (from_address, buf, size + 1, NULL);
	  mu_header_set_value (hdr, "From", buf, 1);
	  free (buf);
	}
    }
  
  if (debug_level > 1)
    {
      mu_debug_t debug;
      mu_mailer_get_debug (mailer, &debug);
      mu_debug_set_level (debug, MU_DEBUG_TRACE | MU_DEBUG_PROT);
      if (debug_level > 2)
	mailer_flags = MAILER_FLAG_DEBUG_DATA;
    }
  
  if (!mailer_opened)
    {
      if ((rc = mu_mailer_open (mailer, mailer_flags)))
	{
	  mu_url_t url = NULL;
	  mu_mailer_get_url (mailer, &url);
	  logmsg (LOG_CRIT, _("opening mailer `%s' failed: %s"),
		  url ? mu_url_to_string (url) : "(unknown URL)",
		  mu_strerror (rc));
	  return;
	}
      mailer_opened = 1;
    }

  if (signer_key)
    sign_message (&msg, signer_key);
  
  if (!dry_run_mode)
    {
      rc = mu_mailer_send_message (mailer, msg, from_address, rcpt);
      if (rc)
	logmsg (LOG_CRIT, _("cannot send message: %s"), mu_strerror (rc));
    }
  
  mu_message_destroy (&msg, mu_message_get_owner (msg));
}

void
mail_finish ()
{
  if (mailer_opened)
    {
      mu_mailer_close (mailer);
      mailer_opened = 0;
    }
}


struct message_template
{
  char *name;
  char *text;
  /*  int mime; for future use */
};

static Hash_table *tmpl_table;

/* Calculate the hash of a string.  */
static size_t
tmpl_hasher (void const *data, unsigned n_buckets)
{
  struct message_template const *tmpl = data;
  return hash_string (tmpl->name, n_buckets);
}

/* Compare two strings for equality.  */
static bool
tmpl_compare (void const *data1, void const *data2)
{
  struct message_template const *tmpl1 = data1;
  struct message_template const *tmpl2 = data2;
  return strcmp (tmpl1->name, tmpl2->name) == 0;
}

static void
tmpl_free (void *data)
{
  free (data);
}

struct message_template *
alloc_message_template (const char *name, const char *text)
{
  struct message_template *tmpl = xmalloc (sizeof (tmpl[0])
					   + strlen (name) + 1
					   + strlen (text) + 1);
  char *p = (char*) (tmpl + 1);
  tmpl->name = p;
  strcpy (tmpl->name, name);

  p += strlen (p) + 1;
  tmpl->text = p;
  strcpy (tmpl->text, text);
  return tmpl;
}

/* Register a template.
   FIXME: Issue a warning if it is already registered. */
void
register_message_template (const char *name, const char *text)
{
  struct message_template *tmpl, *s;

  s = alloc_message_template (name, text);

  if (!((tmpl_table
	 || (tmpl_table = hash_initialize (0, 0,
					   tmpl_hasher,
					   tmpl_compare,
					   tmpl_free)))
	&& (tmpl = hash_insert (tmpl_table, s))))
    xalloc_die ();

  if (s != tmpl)
    tmpl_free (s);
}

const char *
resolve_message_template (const char *name)
{
  if (name[0] == '@')
    {
      if (name[1] == '@')
	return name + 1;
      else if (!tmpl_table)
	return NULL;
      else
	{
	  struct message_template *p, tmpl;

	  tmpl.name = (char*) name + 1;
	  p = hash_lookup (tmpl_table, &tmpl);
	  return p ? p->text : NULL;
	}
    }
  return name;
}


void
mail_stats ()
{
  struct metadef *exp;
  time_t t;
  const char *tmpl;
  char *text;
  size_t tc;

  if (!admin_stat_message || !stat_mask_p (mail_admin_mask) || !mailer)
    return;

  if (!admin_address)
    {
      logmsg (LOG_ERR, _("cannot mail statistics: admin-address not defined"));
      return;
    }

  if (debug_level)
    {
      size_t size;
      char *buf;
      mu_address_to_string (admin_address, NULL, 0, &size);
      buf = xmalloc (size + 1);
      mu_address_to_string (admin_address, buf, size + 1, NULL);
      logmsg (LOG_DEBUG, _("sending stats to %s"), buf);
      free (buf);
    }

  tc = timer_get_count () * 3;
  exp = make_stat_expansion (tc + 1);
  time (&t);
  exp[0].kw = "date";
  exp[0].value = exp[0].storage = xstrdup (ctime (&t));
  exp[0].value [strlen (exp[0].value) - 1] = 0;
  timer_fill_meta (exp + 1, tc);

  tmpl = resolve_message_template (admin_stat_message);
  if (!tmpl)
    {
      logmsg (LOG_ERR, _("undefined message reference: %s"),
	      admin_stat_message);
      return;
    }
  text = meta_expand_string (tmpl, exp, NULL, NULL, NULL);

  mail_send_message (admin_address, text, admin_stat_sign_key);

  free (text);
  meta_free (exp);
  timer_free_meta (exp + 1, tc);
  free (exp);
}

mu_address_t
get_uploader_email (struct uploader_info *info, struct file_triplet *trp,
		    const char **errp)
{
  mu_address_t addr;
  mu_address_t rcpt = NULL;
  int rc;
  
  if (!info)
    return NULL;
  rc = mu_address_create (&addr, info->email);
  if (rc)
    {
      *errp = mu_strerror (rc);
      return NULL;
    }

  mu_address_set_personal (addr, 1, info->realname);

  /* This hack makes sure that mu_address_to_string (rcpt) will
     return full email address (with personal part) */
  mu_address_union (&rcpt, addr);
  mu_address_destroy (&addr);

  return rcpt;
}

mu_address_t
get_recipient (struct dictionary *dict, struct file_triplet *trp,
	       const char **errp)
{
  unsigned nrows, ncols, i;
  mu_address_t rcpt = NULL;
  char *text;
  int rc;
  void *md;

  if (dict->type == dictionary_none)
    {
      *errp = N_("dictionary is not configured");
      return NULL;
    }

  md = dictionary_open (dict);
  if (!md)
    {
      *errp = N_("failed to open dictionary");
      return NULL;
    }

  text = triplet_expand_dictionary_query (dict, md, trp);

  rc = dictionary_lookup (dict, md, text);
  free (text);
  if (rc)
    {
      *errp = N_("cannot obtain recipient emails");
      dictionary_close (dict, md);
      return NULL;
    }

  nrows = dictionary_num_rows (dict);
  ncols = dictionary_num_cols (dict);

  if (nrows == 0)
    {
      *errp = N_("cannot obtain recipient emails");
      return NULL;
    }

  for (i = 0; i < nrows; i++)
    {
      mu_address_t addr;
      const char *str = dictionary_result (dict, md, i, 0);
      if (mu_address_create (&addr, str))
	continue;
      if (ncols > 0)
	{
	  str = dictionary_result (dict, md, i, 1);
	  if (str)
	    mu_address_set_personal (addr, 1, str);
	}
      mu_address_union (&rcpt, addr);
      mu_address_destroy (&addr);
    }
  dictionary_close (dict, md);

  return rcpt;
}

void
do_notify (struct file_triplet *trp, enum notification_event ev,
	   struct notification *ntf)
{
  mu_address_t rcpt = NULL;
  const char *errp;
  const char *msg;

  switch (ntf->tgt)
    {
    case notify_read:
      rcpt = NULL;
      break;
      
    case notify_admin:
      rcpt = mu_address_dup (admin_address);
      break;

    case notify_user:
      rcpt = get_uploader_email (trp->uploader, trp, &errp);
      break;

    case notify_owner:
      rcpt = get_recipient (trp->spool->dictionary[project_owner_dict],
			    trp, &errp);
    }

  if (!rcpt && ntf->tgt != notify_read)
    {
      logmsg (LOG_ERR, _("not notifying %s (project %s) about %s: %s"),
	      notification_target_str (ntf->tgt),
	      trp->project,
	      notification_event_str (ev), gettext (errp));
      return;
    }

  if (debug_level)
    {
      if (rcpt)
	{
	  size_t size;
	  char *buf;
	  mu_address_to_string (rcpt, NULL, 0, &size);
	  buf = xmalloc (size + 1);
	  mu_address_to_string (rcpt, buf, size + 1, NULL);
	  logmsg (LOG_DEBUG, _("notifying %s (project %s) about %s"),
		  buf, trp->project, notification_event_str (ev));
	  free (buf);
	}
      else
	logmsg (LOG_DEBUG,
		_("notifying message recipients (project %s) about %s"),
		trp->project, notification_event_str (ev));
    }

  msg = resolve_message_template (ntf->msg);
  if (!msg)
    logmsg (LOG_ERR, _("undefined message reference: %s"), ntf->msg);
  else
    {
      char *text = triplet_expand_param (msg, trp);
      mail_send_message (rcpt, text, ntf->sign_keys);
      free (text);
    }

  mu_address_destroy (&rcpt);
}

void
notify (struct notification *notification_list,
	struct file_triplet *trp, enum notification_event ev)
{
  struct notification *p;

  for (p = notification_list; p; p = p->next)
    if (p->ev == ev)
      do_notify (trp, ev, p);
  /* FIXME */
}

const char *
expand_email_admin (struct metadef *def, void *data)
{
  size_t size;
  if (mu_address_to_string (admin_address, NULL, 0, &size) == 0)
    {
      size++;
      def->storage = xmalloc (size);
      mu_address_to_string (admin_address, def->storage, size, NULL);
      def->value = def->storage;
    }
  else
    def->value = "";
  return def->value;
}

const char *
expand_email_owner (struct metadef *def, void *data)
{
  struct file_triplet *trp = data;
  mu_address_t addr;
  const char *errp;
  size_t size;
    
  addr = get_recipient (trp->spool->dictionary[project_owner_dict],
			trp, &errp);
  if (!addr)
    {
      logmsg (LOG_ERR, _("cannot get email of the %s's owner: %s"),
	      trp->project, gettext (errp));
      def->value = "";
    }
  else if (mu_address_to_string (addr, NULL, 0, &size) == 0)
    {
      size++;
      def->storage = xmalloc (size);
      mu_address_to_string (addr, def->storage, size, NULL);
      def->value = def->storage;
      mu_address_destroy (&addr);
    }
  else
    def->value = "";
  return def->value;
}

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