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msg->text = dc_stock_system_msg(context, new_image_rel? DC_STR_MSGGRPIMGCHANGED : DC_STR_MSGGRPIMGDELETED, NULL, NULL, DC_CONTACT_ID_SELF);
msg->id = dc_send_msg(context, chat_id, msg);
context->cb(context, DC_EVENT_MSGS_CHANGED, chat_id, msg->id);
}
context->cb(context, DC_EVENT_CHAT_MODIFIED, chat_id, 0);
success = 1;
cleanup:
dc_chat_unref(chat);
dc_msg_unref(msg);
free(new_image_rel);
return success;
}
int dc_get_chat_contact_cnt(dc_context_t* context, uint32_t chat_id)
{
int ret = 0;
sqlite3_stmt* stmt = dc_sqlite3_prepare(context->sql,
"SELECT COUNT(*) FROM chats_contacts WHERE chat_id=?;");
sqlite3_bind_int(stmt, 1, chat_id);
if (sqlite3_step(stmt)==SQLITE_ROW) {
ret = sqlite3_column_int(stmt, 0);
}
sqlite3_finalize(stmt);
return ret;
}
/**
* Check if a given contact ID is a member of a group chat.
*
* @memberof dc_context_t
* @param context The context as created by dc_context_new().
* @param chat_id The chat ID to check.
* @param contact_id The contact ID to check. To check if yourself is member
* of the chat, pass DC_CONTACT_ID_SELF (1) here.
* @return 1=contact ID is member of chat ID, 0=contact is not in chat
*/
int dc_is_contact_in_chat(dc_context_t* context, uint32_t chat_id, uint32_t contact_id)
{
/* this function works for group and for normal chats, however, it is more useful for group chats.
DC_CONTACT_ID_SELF may be used to check, if the user itself is in a group chat (DC_CONTACT_ID_SELF is not added to normal chats) */
int ret = 0;
sqlite3_stmt* stmt = NULL;
if (context==NULL || context->magic!=DC_CONTEXT_MAGIC) {
goto cleanup;
}
stmt = dc_sqlite3_prepare(context->sql,
"SELECT contact_id FROM chats_contacts WHERE chat_id=? AND contact_id=?;");
sqlite3_bind_int(stmt, 1, chat_id);
sqlite3_bind_int(stmt, 2, contact_id);
ret = (sqlite3_step(stmt)==SQLITE_ROW)? 1 : 0;
cleanup:
sqlite3_finalize(stmt);
return ret;
}
int dc_add_contact_to_chat_ex(dc_context_t* context, uint32_t chat_id, uint32_t contact_id, int flags)
{
int success = 0;
dc_contact_t* contact = dc_get_contact(context, contact_id);
dc_chat_t* chat = dc_chat_new(context);
dc_msg_t* msg = dc_msg_new_untyped(context);
char* self_addr = NULL;
if (context==NULL || context->magic!=DC_CONTEXT_MAGIC || contact==NULL || chat_id<=DC_CHAT_ID_LAST_SPECIAL) {
goto cleanup;
}
dc_reset_gossiped_timestamp(context, chat_id);
if (0==real_group_exists(context, chat_id) /*this also makes sure, not contacts are added to special or normal chats*/
|| (0==dc_real_contact_exists(context, contact_id) && contact_id!=DC_CONTACT_ID_SELF)
|| 0==dc_chat_load_from_db(chat, chat_id)) {
goto cleanup;
}
if (!IS_SELF_IN_GROUP) {
dc_log_event(context, DC_EVENT_ERROR_SELF_NOT_IN_GROUP, 0,
"Cannot add contact to group; self not in group.");
goto cleanup; /* we shoud respect this - whatever we send to the group, it gets discarded anyway! */
}
if ((flags&DC_FROM_HANDSHAKE) && dc_param_get_int(chat->param, DC_PARAM_UNPROMOTED, 0)==1) {
// after a handshake, force sending the `Chat-Group-Member-Added` message
dc_param_set(chat->param, DC_PARAM_UNPROMOTED, NULL);
dc_chat_update_param(chat);
}
self_addr = dc_sqlite3_get_config(context->sql, "configured_addr", "");
if (strcasecmp(contact->addr, self_addr)==0) {
goto cleanup; /* ourself is added using DC_CONTACT_ID_SELF, do not add it explicitly. if SELF is not in the group, members cannot be added at all. */
}