Introduce libemail-engine and libemail-utils.

These libraries are bound for E-D-S so they live at the lowest layer of
Evolution for now -- even libeutil can link to them (but please don't).

This is the first step toward moving mail handing to a D-Bus service.

1 files changed, 931 insertions, 0 deletions

diff --git a/libemail-engine/e-mail-session-utils.c b/libemail-engine/e-mail-session-utils.c
new file mode 100644
index 0000000000..979d15388e
--- /dev/null
+++ b/libemail-engine/e-mail-session-utils.c
@@ -0,0 +1,931 @@
+/*
+ * e-mail-session-utils.c
+ *
+ * This program 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 of the License, or (at your option) version 3.
+ *
+ * This program 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 the program; if not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "e-mail-session-utils.h"
+
+#include <glib/gi18n-lib.h>
+
+#include <libemail-engine/e-mail-folder-utils.h>
+#include <libemail-engine/e-mail-utils.h>
+#include <libemail-engine/mail-tools.h>
+#include <libemail-utils/e-account-utils.h>
+
+/* X-Mailer header value */
+#define X_MAILER ("Evolution " VERSION SUB_VERSION " " VERSION_COMMENT)
+
+/* FIXME: Temporary - remove this after we move filter/ to eds */
+#define E_FILTER_SOURCE_OUTGOING "outgoing"
+
+typedef struct _AsyncContext AsyncContext;
+
+struct _AsyncContext {
+	CamelFolder *sent_folder;
+
+	CamelMimeMessage *message;
+	CamelMessageInfo *info;
+
+	CamelAddress *from;
+	CamelAddress *recipients;
+
+	CamelFilterDriver *driver;
+
+	GCancellable *cancellable;
+	gint io_priority;
+
+	/* X-Evolution headers */
+	struct _camel_header_raw *xev;
+
+	GPtrArray *post_to_uris;
+
+	gchar *folder_uri;
+	gchar *message_uid;
+	gchar *transport_uid;
+	gchar *sent_folder_uri;
+};
+
+static void
+async_context_free (AsyncContext *context)
+{
+	if (context->sent_folder != NULL)
+		g_object_unref (context->sent_folder);
+
+	if (context->message != NULL)
+		g_object_unref (context->message);
+
+	if (context->info != NULL)
+		camel_message_info_free (context->info);
+
+	if (context->from != NULL)
+		g_object_unref (context->from);
+
+	if (context->recipients != NULL)
+		g_object_unref (context->recipients);
+
+	if (context->driver != NULL)
+		g_object_unref (context->driver);
+
+	if (context->cancellable != NULL) {
+		camel_operation_pop_message (context->cancellable);
+		g_object_unref (context->cancellable);
+	}
+
+	if (context->xev != NULL)
+		camel_header_raw_clear (&context->xev);
+
+	if (context->post_to_uris != NULL) {
+		g_ptr_array_foreach (
+			context->post_to_uris, (GFunc) g_free, NULL);
+		g_ptr_array_free (context->post_to_uris, TRUE);
+	}
+
+	g_free (context->folder_uri);
+	g_free (context->message_uid);
+	g_free (context->transport_uid);
+	g_free (context->sent_folder_uri);
+
+	g_slice_free (AsyncContext, context);
+}
+
+GQuark
+e_mail_error_quark (void)
+{
+	static GQuark quark = 0;
+
+	if (G_UNLIKELY (quark == 0)) {
+		const gchar *string = "e-mail-error-quark";
+		quark = g_quark_from_static_string (string);
+	}
+
+	return quark;
+}
+
+static void
+mail_session_handle_draft_headers_thread (GSimpleAsyncResult *simple,
+                                          EMailSession *session,
+                                          GCancellable *cancellable)
+{
+	AsyncContext *context;
+	GError *error = NULL;
+
+	context = g_simple_async_result_get_op_res_gpointer (simple);
+
+	e_mail_session_handle_draft_headers_sync (
+		session, context->message, cancellable, &error);
+
+	if (error != NULL)
+		g_simple_async_result_take_error (simple, error);
+}
+
+gboolean
+e_mail_session_handle_draft_headers_sync (EMailSession *session,
+                                          CamelMimeMessage *message,
+                                          GCancellable *cancellable,
+                                          GError **error)
+{
+	CamelFolder *folder;
+	CamelMedium *medium;
+	const gchar *folder_uri;
+	const gchar *message_uid;
+	const gchar *header_name;
+	gboolean success;
+
+	g_return_val_if_fail (E_IS_MAIL_SESSION (session), FALSE);
+	g_return_val_if_fail (CAMEL_IS_MIME_MESSAGE (message), FALSE);
+
+	medium = CAMEL_MEDIUM (message);
+
+	header_name = "X-Evolution-Draft-Folder";
+	folder_uri = camel_medium_get_header (medium, header_name);
+
+	header_name = "X-Evolution-Draft-Message";
+	message_uid = camel_medium_get_header (medium, header_name);
+
+	/* Don't report errors about missing X-Evolution-Draft
+	 * headers.  These headers are optional, so their absence
+	 * is handled by doing nothing. */
+	if (folder_uri == NULL || message_uid == NULL)
+		return TRUE;
+
+	folder = e_mail_session_uri_to_folder_sync (
+		session, folder_uri, 0, cancellable, error);
+
+	if (folder == NULL)
+		return FALSE;
+
+	camel_folder_set_message_flags (
+		folder, message_uid,
+		CAMEL_MESSAGE_DELETED | CAMEL_MESSAGE_SEEN,
+		CAMEL_MESSAGE_DELETED | CAMEL_MESSAGE_SEEN);
+
+	success = camel_folder_synchronize_message_sync (
+		folder, message_uid, cancellable, error);
+
+	g_object_unref (folder);
+
+	return success;
+}
+
+void
+e_mail_session_handle_draft_headers (EMailSession *session,
+                                     CamelMimeMessage *message,
+                                     gint io_priority,
+                                     GCancellable *cancellable,
+                                     GAsyncReadyCallback callback,
+                                     gpointer user_data)
+{
+	GSimpleAsyncResult *simple;
+	AsyncContext *context;
+
+	g_return_if_fail (E_IS_MAIL_SESSION (session));
+	g_return_if_fail (CAMEL_IS_MIME_MESSAGE (message));
+
+	context = g_slice_new0 (AsyncContext);
+	context->message = g_object_ref (message);
+
+	simple = g_simple_async_result_new (
+		G_OBJECT (session), callback, user_data,
+		e_mail_session_handle_draft_headers);
+
+	g_simple_async_result_set_op_res_gpointer (
+		simple, context, (GDestroyNotify) async_context_free);
+
+	g_simple_async_result_run_in_thread (
+		simple, (GSimpleAsyncThreadFunc)
+		mail_session_handle_draft_headers_thread,
+		io_priority, cancellable);
+
+	g_object_unref (simple);
+}
+
+gboolean
+e_mail_session_handle_draft_headers_finish (EMailSession *session,
+                                            GAsyncResult *result,
+                                            GError **error)
+{
+	GSimpleAsyncResult *simple;
+
+	g_return_val_if_fail (
+		g_simple_async_result_is_valid (
+		result, G_OBJECT (session),
+		e_mail_session_handle_draft_headers), FALSE);
+
+	simple = G_SIMPLE_ASYNC_RESULT (result);
+
+	/* Assume success unless a GError is set. */
+	return !g_simple_async_result_propagate_error (simple, error);
+}
+
+static void
+mail_session_handle_source_headers_thread (GSimpleAsyncResult *simple,
+                                           EMailSession *session,
+                                           GCancellable *cancellable)
+{
+	AsyncContext *context;
+	GError *error = NULL;
+
+	context = g_simple_async_result_get_op_res_gpointer (simple);
+
+	e_mail_session_handle_source_headers_sync (
+		session, context->message, cancellable, &error);
+
+	if (error != NULL)
+		g_simple_async_result_take_error (simple, error);
+}
+
+gboolean
+e_mail_session_handle_source_headers_sync (EMailSession *session,
+                                           CamelMimeMessage *message,
+                                           GCancellable *cancellable,
+                                           GError **error)
+{
+	CamelFolder *folder;
+	CamelMedium *medium;
+	CamelMessageFlags flags = 0;
+	const gchar *folder_uri;
+	const gchar *message_uid;
+	const gchar *flag_string;
+	const gchar *header_name;
+	gboolean success;
+	guint length, ii;
+	gchar **tokens;
+	gchar *string;
+
+	g_return_val_if_fail (E_IS_MAIL_SESSION (session), FALSE);
+	g_return_val_if_fail (CAMEL_IS_MIME_MESSAGE (message), FALSE);
+
+	medium = CAMEL_MEDIUM (message);
+
+	header_name = "X-Evolution-Source-Folder";
+	folder_uri = camel_medium_get_header (medium, header_name);
+
+	header_name = "X-Evolution-Source-Message";
+	message_uid = camel_medium_get_header (medium, header_name);
+
+	header_name = "X-Evolution-Source-Flags";
+	flag_string = camel_medium_get_header (medium, header_name);
+
+	/* Don't report errors about missing X-Evolution-Source
+	 * headers.  These headers are optional, so their absence
+	 * is handled by doing nothing. */
+	if (folder_uri == NULL || message_uid == NULL || flag_string == NULL)
+		return TRUE;
+
+	/* Convert the flag string to CamelMessageFlags. */
+
+	string = g_strstrip (g_strdup (flag_string));
+	tokens = g_strsplit (string, " ", 0);
+	g_free (string);
+
+	/* If tokens is NULL, a length of 0 will skip the loop. */
+	length = (tokens != NULL) ? g_strv_length (tokens) : 0;
+
+	for (ii = 0; ii < length; ii++) {
+		/* Note: We're only checking for flags known to
+		 * be used in X-Evolution-Source-Flags headers.
+		 * Add more as needed. */
+		if (g_strcmp0 (tokens[ii], "ANSWERED") == 0)
+			flags |= CAMEL_MESSAGE_ANSWERED;
+		else if (g_strcmp0 (tokens[ii], "ANSWERED_ALL") == 0)
+			flags |= CAMEL_MESSAGE_ANSWERED_ALL;
+		else if (g_strcmp0 (tokens[ii], "FORWARDED") == 0)
+			flags |= CAMEL_MESSAGE_FORWARDED;
+		else if (g_strcmp0 (tokens[ii], "SEEN") == 0)
+			flags |= CAMEL_MESSAGE_SEEN;
+		else
+			g_warning (
+				"Unknown flag '%s' in %s",
+				tokens[ii], header_name);
+	}
+
+	g_strfreev (tokens);
+
+	folder = e_mail_session_uri_to_folder_sync (
+		session, folder_uri, 0, cancellable, error);
+
+	if (folder == NULL)
+		return FALSE;
+
+	camel_folder_set_message_flags (
+		folder, message_uid, flags, flags);
+
+	success = camel_folder_synchronize_message_sync (
+		folder, message_uid, cancellable, error);
+
+	g_object_unref (folder);
+
+	return success;
+}
+
+void
+e_mail_session_handle_source_headers (EMailSession *session,
+                                      CamelMimeMessage *message,
+                                      gint io_priority,
+                                      GCancellable *cancellable,
+                                      GAsyncReadyCallback callback,
+                                      gpointer user_data)
+{
+	GSimpleAsyncResult *simple;
+	AsyncContext *context;
+
+	g_return_if_fail (E_IS_MAIL_SESSION (session));
+	g_return_if_fail (CAMEL_IS_MIME_MESSAGE (message));
+
+	context = g_slice_new0 (AsyncContext);
+	context->message = g_object_ref (message);
+
+	simple = g_simple_async_result_new (
+		G_OBJECT (session), callback, user_data,
+		e_mail_session_handle_source_headers);
+
+	g_simple_async_result_set_op_res_gpointer (
+		simple, context, (GDestroyNotify) async_context_free);
+
+	g_simple_async_result_run_in_thread (
+		simple, (GSimpleAsyncThreadFunc)
+		mail_session_handle_source_headers_thread,
+		io_priority, cancellable);
+
+	g_object_unref (simple);
+}
+
+gboolean
+e_mail_session_handle_source_headers_finish (EMailSession *session,
+                                             GAsyncResult *result,
+                                             GError **error)
+{
+	GSimpleAsyncResult *simple;
+
+	g_return_val_if_fail (
+		g_simple_async_result_is_valid (
+		result, G_OBJECT (session),
+		e_mail_session_handle_draft_headers), FALSE);
+
+	simple = G_SIMPLE_ASYNC_RESULT (result);
+
+	/* Assume success unless a GError is set. */
+	return !g_simple_async_result_propagate_error (simple, error);
+}
+
+static void
+mail_session_send_to_thread (GSimpleAsyncResult *simple,
+                             EMailSession *session,
+                             GCancellable *cancellable)
+{
+	AsyncContext *context;
+	CamelFolder *local_sent_folder;
+	GString *error_messages;
+	gboolean copy_to_sent = TRUE;
+	guint ii;
+	GError *error = NULL;
+
+	context = g_simple_async_result_get_op_res_gpointer (simple);
+
+	/* Send the message to all recipients. */
+	if (camel_address_length (context->recipients) > 0) {
+		CamelProvider *provider;
+		CamelService *service;
+		gboolean did_connect = FALSE;
+
+		service = camel_session_get_service (
+			CAMEL_SESSION (session), context->transport_uid);
+
+		if (!CAMEL_IS_TRANSPORT (service)) {
+			g_simple_async_result_set_error (simple,
+				CAMEL_SERVICE_ERROR,
+				CAMEL_SERVICE_ERROR_URL_INVALID,
+				_("Cannot get transport for account '%s'"),
+				context->transport_uid);
+			return;
+		}
+
+		if (camel_service_get_connection_status (service) != CAMEL_SERVICE_CONNECTED) {
+			did_connect = TRUE;
+
+			/* XXX This API does not allow for cancellation. */
+			if (!em_utils_connect_service_sync (service, cancellable, &error)) {
+				g_simple_async_result_take_error (simple, error);
+				return;
+			}
+		}
+
+		provider = camel_service_get_provider (service);
+
+		if (provider->flags & CAMEL_PROVIDER_DISABLE_SENT_FOLDER)
+			copy_to_sent = FALSE;
+
+		camel_transport_send_to_sync (
+			CAMEL_TRANSPORT (service),
+			context->message, context->from,
+			context->recipients, cancellable, &error);
+
+		if (did_connect)
+			em_utils_disconnect_service_sync (
+				service, error == NULL,
+				cancellable, error ? NULL : &error);
+
+		if (error != NULL) {
+			g_simple_async_result_take_error (simple, error);
+			return;
+		}
+	}
+
+	/* Post the message to requested folders. */
+	for (ii = 0; ii < context->post_to_uris->len; ii++) {
+		CamelFolder *folder;
+		const gchar *folder_uri;
+
+		folder_uri = g_ptr_array_index (context->post_to_uris, ii);
+
+		folder = e_mail_session_uri_to_folder_sync (
+			session, folder_uri, 0, cancellable, &error);
+
+		if (error != NULL) {
+			g_warn_if_fail (folder == NULL);
+			g_simple_async_result_take_error (simple, error);
+			return;
+		}
+
+		g_return_if_fail (CAMEL_IS_FOLDER (folder));
+
+		camel_folder_append_message_sync (
+			folder, context->message, context->info,
+			NULL, cancellable, &error);
+
+		g_object_unref (folder);
+
+		if (error != NULL) {
+			g_simple_async_result_take_error (simple, error);
+			return;
+		}
+	}
+
+	/*** Post Processing ***/
+
+	/* This accumulates error messages during post-processing. */
+	error_messages = g_string_sized_new (256);
+
+	mail_tool_restore_xevolution_headers (context->message, context->xev);
+
+	/* Run filters on the outgoing message. */
+	if (context->driver != NULL) {
+		camel_filter_driver_filter_message (
+			context->driver, context->message, context->info,
+			NULL, NULL, NULL, "", cancellable, &error);
+
+		if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
+			goto exit;
+
+		if (error != NULL) {
+			g_string_append_printf (
+				error_messages,
+				_("Failed to apply outgoing filters: %s"),
+				error->message);
+			g_clear_error (&error);
+		}
+	}
+
+	if (!copy_to_sent)
+		goto cleanup;
+
+	/* Append the sent message to a Sent folder. */
+
+	local_sent_folder =
+		e_mail_session_get_local_folder (
+		session, E_MAIL_LOCAL_FOLDER_SENT);
+
+	/* Try to extract a CamelFolder from the Sent folder URI. */
+	if (context->sent_folder_uri != NULL) {
+		context->sent_folder = e_mail_session_uri_to_folder_sync (
+			session, context->sent_folder_uri, 0,
+			cancellable, &error);
+		if (error != NULL) {
+			g_warn_if_fail (context->sent_folder == NULL);
+			if (error_messages->len > 0)
+				g_string_append (error_messages, "\n\n");
+			g_string_append_printf (
+				error_messages,
+				_("Failed to append to %s: %s\n"
+				  "Appending to local 'Sent' folder instead."),
+				context->sent_folder_uri, error->message);
+			g_clear_error (&error);
+		}
+	}
+
+	/* Fall back to the local Sent folder. */
+	if (context->sent_folder == NULL)
+		context->sent_folder = g_object_ref (local_sent_folder);
+
+	/* Append the message. */
+	camel_folder_append_message_sync (
+		context->sent_folder, context->message,
+		context->info, NULL, cancellable, &error);
+
+	if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
+		goto exit;
+
+	if (error == NULL)
+		goto cleanup;
+
+	/* If appending to a remote Sent folder failed,
+	 * try appending to the local Sent folder. */
+	if (context->sent_folder != local_sent_folder) {
+		const gchar *description;
+
+		description = camel_folder_get_description (
+			context->sent_folder);
+
+		if (error_messages->len > 0)
+			g_string_append (error_messages, "\n\n");
+		g_string_append_printf (
+			error_messages,
+			_("Failed to append to %s: %s\n"
+			  "Appending to local 'Sent' folder instead."),
+			description, error->message);
+		g_clear_error (&error);
+
+		camel_folder_append_message_sync (
+			local_sent_folder, context->message,
+			context->info, NULL, cancellable, &error);
+	}
+
+	if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
+		goto exit;
+
+	/* We can't even append to the local Sent folder?
+	 * In that case just leave the message in Outbox. */
+	if (error != NULL) {
+		if (error_messages->len > 0)
+			g_string_append (error_messages, "\n\n");
+		g_string_append_printf (
+			error_messages,
+			_("Failed to append to local 'Sent' folder: %s"),
+			error->message);
+		g_clear_error (&error);
+		goto exit;
+	}
+
+cleanup:
+
+	/* The send operation was successful; ignore cleanup errors. */
+
+	/* Mark the draft message for deletion, if present. */
+	e_mail_session_handle_draft_headers_sync (
+		session, context->message, cancellable, &error);
+	if (error != NULL) {
+		g_warning ("%s", error->message);
+		g_clear_error (&error);
+	}
+
+	/* Set flags on the original source message, if present.
+	 * Source message refers to the message being forwarded
+	 * or replied to. */
+	e_mail_session_handle_source_headers_sync (
+		session, context->message, cancellable, &error);
+	if (error != NULL) {
+		g_warning ("%s", error->message);
+		g_clear_error (&error);
+	}
+
+exit:
+
+	/* If we were cancelled, disregard any other errors. */
+	if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
+		g_simple_async_result_take_error (simple, error);
+
+	/* Stuff the accumulated error messages in a GError. */
+	} else if (error_messages->len > 0) {
+		g_simple_async_result_set_error (
+			simple, E_MAIL_ERROR,
+			E_MAIL_ERROR_POST_PROCESSING,
+			"%s", error_messages->str);
+	}
+
+	/* Synchronize the Sent folder. */
+	if (context->sent_folder != NULL)
+		camel_folder_synchronize_sync (
+			context->sent_folder, FALSE, cancellable, NULL);
+
+	g_string_free (error_messages, TRUE);
+}
+
+void
+e_mail_session_send_to (EMailSession *session,
+                        CamelMimeMessage *message,
+                        gint io_priority,
+                        GCancellable *cancellable,
+                        CamelFilterGetFolderFunc get_folder_func,
+                        gpointer get_folder_data,
+                        GAsyncReadyCallback callback,
+                        gpointer user_data)
+{
+	GSimpleAsyncResult *simple;
+	AsyncContext *context;
+	CamelAddress *from;
+	CamelAddress *recipients;
+	CamelMedium *medium;
+	CamelMessageInfo *info;
+	EAccount *account = NULL;
+	GPtrArray *post_to_uris;
+	struct _camel_header_raw *xev;
+	struct _camel_header_raw *header;
+	const gchar *string;
+	const gchar *resent_from;
+	gchar *transport_uid = NULL;
+	gchar *sent_folder_uri = NULL;
+	GError *error = NULL;
+
+	g_return_if_fail (E_IS_MAIL_SESSION (session));
+	g_return_if_fail (CAMEL_IS_MIME_MESSAGE (message));
+
+	medium = CAMEL_MEDIUM (message);
+
+	camel_medium_set_header (medium, "X-Mailer", X_MAILER);
+
+	xev = mail_tool_remove_xevolution_headers (message);
+
+	/* Extract directives from X-Evolution headers. */
+
+	string = camel_header_raw_find (&xev, "X-Evolution-Account", NULL);
+	if (string != NULL) {
+		gchar *account_uid;
+
+		account_uid = g_strstrip (g_strdup (string));
+		account = e_get_account_by_uid (account_uid);
+		g_free (account_uid);
+	}
+
+	if (account != NULL) {
+		if (account->transport != NULL) {
+
+			/* XXX Transport UIDs are kludgy right now.  We
+			 *     use the EAccount's regular UID and tack on
+			 *     "-transport".  Will be better soon. */
+			transport_uid = g_strconcat (
+				account->uid, "-transport", NULL);
+
+			/* to reprompt password on sending if needed */
+			account->transport->get_password_canceled = FALSE;
+		}
+		sent_folder_uri = g_strdup (account->sent_folder_uri);
+	}
+
+	string = camel_header_raw_find (&xev, "X-Evolution-Fcc", NULL);
+	if (sent_folder_uri == NULL && string != NULL)
+		sent_folder_uri = g_strstrip (g_strdup (string));
+
+	string = camel_header_raw_find (&xev, "X-Evolution-Transport", NULL);
+	if (transport_uid == NULL && string != NULL)
+		transport_uid = g_strstrip (g_strdup (string));
+
+	post_to_uris = g_ptr_array_new ();
+	for (header = xev; header != NULL; header = header->next) {
+		gchar *folder_uri;
+
+		if (g_strcmp0 (header->name, "X-Evolution-PostTo") != 0)
+			continue;
+
+		folder_uri = g_strstrip (g_strdup (header->value));
+		g_ptr_array_add (post_to_uris, folder_uri);
+	}
+
+	/* Collect sender and recipients from headers. */
+
+	from = (CamelAddress *) camel_internet_address_new ();
+	recipients = (CamelAddress *) camel_internet_address_new ();
+	resent_from = camel_medium_get_header (medium, "Resent-From");
+
+	if (resent_from != NULL) {
+		const CamelInternetAddress *addr;
+		const gchar *type;
+
+		camel_address_decode (from, resent_from);
+
+		type = CAMEL_RECIPIENT_TYPE_RESENT_TO;
+		addr = camel_mime_message_get_recipients (message, type);
+		camel_address_cat (recipients, CAMEL_ADDRESS (addr));
+
+		type = CAMEL_RECIPIENT_TYPE_RESENT_CC;
+		addr = camel_mime_message_get_recipients (message, type);
+		camel_address_cat (recipients, CAMEL_ADDRESS (addr));
+
+		type = CAMEL_RECIPIENT_TYPE_RESENT_BCC;
+		addr = camel_mime_message_get_recipients (message, type);
+		camel_address_cat (recipients, CAMEL_ADDRESS (addr));
+
+	} else {
+		const CamelInternetAddress *addr;
+		const gchar *type;
+
+		addr = camel_mime_message_get_from (message);
+		camel_address_copy (from, CAMEL_ADDRESS (addr));
+
+		type = CAMEL_RECIPIENT_TYPE_TO;
+		addr = camel_mime_message_get_recipients (message, type);
+		camel_address_cat (recipients, CAMEL_ADDRESS (addr));
+
+		type = CAMEL_RECIPIENT_TYPE_CC;
+		addr = camel_mime_message_get_recipients (message, type);
+		camel_address_cat (recipients, CAMEL_ADDRESS (addr));
+
+		type = CAMEL_RECIPIENT_TYPE_BCC;
+		addr = camel_mime_message_get_recipients (message, type);
+		camel_address_cat (recipients, CAMEL_ADDRESS (addr));
+	}
+
+	/* Miscellaneous preparations. */
+
+	info = camel_message_info_new (NULL);
+	camel_message_info_set_flags (info, CAMEL_MESSAGE_SEEN, ~0);
+
+	/* The rest of the processing happens in a thread. */
+
+	context = g_slice_new0 (AsyncContext);
+	context->message = g_object_ref (message);
+	context->io_priority = io_priority;
+	context->from = from;
+	context->recipients = recipients;
+	context->message = g_object_ref (message);
+	context->info = info;
+	context->xev = xev;
+	context->post_to_uris = post_to_uris;
+	context->transport_uid = transport_uid;
+	context->sent_folder_uri = sent_folder_uri;
+
+	if (G_IS_CANCELLABLE (cancellable))
+		context->cancellable = g_object_ref (cancellable);
+
+	/* Failure here emits a runtime warning but is non-fatal. */
+	context->driver = camel_session_get_filter_driver (
+		CAMEL_SESSION (session), E_FILTER_SOURCE_OUTGOING, &error);
+	if (context->driver != NULL && get_folder_func)
+		camel_filter_driver_set_folder_func (
+			context->driver, get_folder_func, get_folder_data);
+	if (error != NULL) {
+		g_warn_if_fail (context->driver == NULL);
+		g_warning ("%s", error->message);
+		g_error_free (error);
+	}
+
+	/* This gets popped in async_context_free(). */
+	camel_operation_push_message (
+		context->cancellable, _("Sending message"));
+
+	simple = g_simple_async_result_new (
+		G_OBJECT (session), callback,
+		user_data, e_mail_session_send_to);
+
+	g_simple_async_result_set_op_res_gpointer (
+		simple, context, (GDestroyNotify) async_context_free);
+
+	g_simple_async_result_run_in_thread (
+		simple, (GSimpleAsyncThreadFunc)
+		mail_session_send_to_thread,
+		context->io_priority,
+		context->cancellable);
+
+	g_object_unref (simple);
+}
+
+gboolean
+e_mail_session_send_to_finish (EMailSession *session,
+                               GAsyncResult *result,
+                               GError **error)
+{
+	GSimpleAsyncResult *simple;
+
+	g_return_val_if_fail (
+		g_simple_async_result_is_valid (
+		result, G_OBJECT (session),
+		e_mail_session_send_to), FALSE);
+
+	simple = G_SIMPLE_ASYNC_RESULT (result);
+
+	/* Assume success unless a GError is set. */
+	return !g_simple_async_result_propagate_error (simple, error);
+}
+
+static void
+mail_session_unsubscribe_folder_thread (GSimpleAsyncResult *simple,
+                                        EMailSession *session,
+                                        GCancellable *cancellable)
+{
+	AsyncContext *context;
+	GError *error = NULL;
+
+	context = g_simple_async_result_get_op_res_gpointer (simple);
+
+	e_mail_session_unsubscribe_folder_sync (
+		session, context->folder_uri, cancellable, &error);
+
+	if (error != NULL)
+		g_simple_async_result_take_error (simple, error);
+}
+
+gboolean
+e_mail_session_unsubscribe_folder_sync (EMailSession *session,
+                                        const gchar *folder_uri,
+                                        GCancellable *cancellable,
+                                        GError **error)
+{
+	CamelStore *store = NULL;
+	gchar *folder_name = NULL;
+	const gchar *message;
+	gboolean success = FALSE;
+
+	g_return_val_if_fail (E_IS_MAIL_SESSION (session), FALSE);
+	g_return_val_if_fail (folder_uri != NULL, FALSE);
+
+	success = e_mail_folder_uri_parse (
+		CAMEL_SESSION (session), folder_uri,
+		&store, &folder_name, error);
+
+	if (!success)
+		return FALSE;
+
+	message = _("Unsubscribing from folder '%s'");
+	camel_operation_push_message (cancellable, message, folder_name);
+
+	/* FIXME This should take our GCancellable. */
+	success =
+		em_utils_connect_service_sync (
+			CAMEL_SERVICE (store), cancellable, error) &&
+		camel_subscribable_unsubscribe_folder_sync (
+			CAMEL_SUBSCRIBABLE (store),
+			folder_name, cancellable, error);
+
+	camel_operation_pop_message (cancellable);
+
+	g_object_unref (store);
+	g_free (folder_name);
+
+	return success;
+}
+
+void
+e_mail_session_unsubscribe_folder (EMailSession *session,
+                                   const gchar *folder_uri,
+                                   gint io_priority,
+                                   GCancellable *cancellable,
+                                   GAsyncReadyCallback callback,
+                                   gpointer user_data)
+{
+	GSimpleAsyncResult *simple;
+	AsyncContext *context;
+
+	g_return_if_fail (E_IS_MAIL_SESSION (session));
+	g_return_if_fail (folder_uri != NULL);
+
+	context = g_slice_new0 (AsyncContext);
+	context->folder_uri = g_strdup (folder_uri);
+
+	simple = g_simple_async_result_new (
+		G_OBJECT (session), callback, user_data,
+		e_mail_session_unsubscribe_folder);
+
+	g_simple_async_result_set_op_res_gpointer (
+		simple, context, (GDestroyNotify) async_context_free);
+
+	g_simple_async_result_run_in_thread (
+		simple, (GSimpleAsyncThreadFunc)
+		mail_session_unsubscribe_folder_thread,
+		io_priority, cancellable);
+
+	g_object_unref (simple);
+}
+
+gboolean
+e_mail_session_unsubscribe_folder_finish (EMailSession *session,
+                                          GAsyncResult *result,
+                                          GError **error)
+{
+	GSimpleAsyncResult *simple;
+
+	g_return_val_if_fail (
+		g_simple_async_result_is_valid (
+		result, G_OBJECT (session),
+		e_mail_session_unsubscribe_folder), FALSE);
+
+	simple = G_SIMPLE_ASYNC_RESULT (result);
+
+	/* Assume success unless a GError is set. */
+	return !g_simple_async_result_propagate_error (simple, error);
+}