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/* wydawca - automatic release submission daemon
   Copyright (C) 2007-2013 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 <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));
		}
	}
}

static ssize_t
mu_stream_data_read_cb(void *handle, void *buffer, size_t size)
{
	mu_stream_t str = handle;
	size_t nread;
	int rc;

	rc = mu_stream_read(str, buffer, size, &nread);
	if (rc) {
		logmsg(LOG_ERR, "mu_stream_read: %s", mu_strerror(rc));
		errno = EIO;
		return -1;
	}
	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;
	mu_stream_t istr, ostr, bodystr;
	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_streamref(body, &bodystr))) {
		logmsg(LOG_ERR, "mu_message_get_stream: %s", mu_strerror(rc));
		return 1;
	}

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

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

	rc = gpg_sign(&output, input, key);
	mu_stream_unref(bodystr);
	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_streamref(newmsg, &ostr);

	/* Copy headers */
	mu_message_get_header(msg, &hdr);
	mu_header_get_streamref(hdr, &istr);

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

		if (rc == 0) {
			mu_message_destroy(&msg, mu_message_get_owner(msg));
			*pmsg = newmsg;
		}
	}
	mu_stream_unref(istr);
	mu_stream_unref(ostr);

	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;
	static char *x_mailer = "wydawca (" PACKAGE_STRING ")";
	const char *sval;

	mu_static_memory_stream_create(&stream, text, strlen(text));
	rc = mu_stream_to_message(stream, &msg);
	mu_stream_unref(stream);
	if (rc) {
		logmsg(LOG_CRIT, _("cannot create message: %s"),
		       mu_strerror(rc));
		return;
	}
	mu_message_get_header(msg, &hdr);
	mu_header_append(hdr, "X-Mailer", x_mailer);

	if (rcpt) {
		const char *s;

		if (mu_address_sget_printable(rcpt, &s) == 0)
			mu_header_set_value(hdr, "To", s, 1);

		if (from_address && mu_header_sget_value(hdr, "From", &sval)) {
			if (mu_address_sget_printable(from_address, &s) == 0)
				mu_header_set_value(hdr, "From", s, 1);
		}
	}

	if (debug_level > 1) {
		mu_debug_level_t level;

		mu_debug_get_category_level(MU_DEBCAT_MAILER, &level);
		level |= MU_DEBUG_LEVEL_MASK(MU_DEBUG_TRACE0) |
		    MU_DEBUG_LEVEL_MASK(MU_DEBUG_PROT);
		if (debug_level > 2)
			level |= MU_DEBUG_LEVEL_MASK(MU_DEBUG_TRACE7);
		mu_debug_set_category_level(MU_DEBCAT_MAILER, level);
	}

	if (!mailer_opened) {
		if ((rc = mu_mailer_open(mailer, 0))) {
			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 struct grecs_symtab *tmpl_table;

/* Register a template. */
void
register_message_template(const char *name, const char *text)
{
	struct message_template key, *tmpl;
	int install = 1;

	key.name = (char *)text;

	if (!tmpl_table) {
		tmpl_table = grecs_symtab_create_default(sizeof(key));
		if (!tmpl_table)
			grecs_alloc_die();
	}

	tmpl = grecs_symtab_lookup_or_install(tmpl_table, &key, &install);
	if (!tmpl)
		grecs_alloc_die();
	if (!install)
		grecs_warning(NULL, 0, "template %s already registered", text);
}

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, key;

			key.name = (char *)name + 1;
			p = grecs_symtab_lookup_or_install(tmpl_table, &key,
							   NULL);
			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) {
		const char *s;

		if (mu_address_sget_printable(admin_address, &s) == 0)
			logmsg(LOG_DEBUG, _("sending stats to %s"), s);
	}

	tc = timer_get_count() * 3;
	exp = make_stat_expansion(tc + 1);
	time(&t);
	exp[0].kw = "date";
	exp[0].value = exp[0].storage = grecs_strdup(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) {
			const char *s;

			if (mu_address_sget_printable(rcpt, &s) == 0)
				logmsg(LOG_DEBUG,
				       _("notifying %s (project %s) about %s"),
				       s, trp->project,
				       notification_event_str(ev));
		} 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);
}

const char *
expand_email_admin(struct metadef *def, void *data)
{
	if (mu_address_aget_printable(admin_address, &def->storage) == 0)
		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;

	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_aget_printable(addr, &def->storage) == 0)
			def->value = def->storage;
		else
			def->value = "";
		mu_address_destroy(&addr);
	}
	return def->value;
}

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