premiere-libtorrent/include/libtorrent/add_torrent_params.hpp

/*

Copyright (c) 2009-2016, Arvid Norberg
All rights reserved.

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modification, are permitted provided that the following conditions
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      from this software without specific prior written permission.

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*/

#ifndef TORRENT_ADD_TORRENT_PARAMS_HPP_INCLUDED
#define TORRENT_ADD_TORRENT_PARAMS_HPP_INCLUDED

#include <string>
#include <vector>
#include <map>
#include <functional>
#include <ctime>

#include "libtorrent/storage_defs.hpp"
#include "libtorrent/sha1_hash.hpp"
#include "libtorrent/version.hpp"
#include "libtorrent/socket.hpp" // for tcp::endpoint
#include "libtorrent/bitfield.hpp"
#include "libtorrent/error_code.hpp"

namespace libtorrent
{
	class torrent_info;
	struct torrent_plugin;
	struct torrent_handle;

	// The add_torrent_params is a parameter pack for adding torrents to a
	// session. The key fields when adding a torrent are:
	//
	// * ti - when you have a .torrent file
	// * url - when you have a magnet link
	// * info_hash - when all you have is an info-hash (this is similar to a
	//   magnet link)
	//
	// one of those fields need to be set. Another mandatory field is
	// ``save_path``. The add_torrent_params object is passed into one of the
	// ``session::add_torrent()`` overloads or ``session::async_add_torrent()``.
	//
	// If you only specify the info-hash, the torrent file will be downloaded
	// from peers, which requires them to support the metadata extension. For
	// the metadata extension to work, libtorrent must be built with extensions
	// enabled (``TORRENT_DISABLE_EXTENSIONS`` must not be defined). It also
	// takes an optional ``name`` argument. This may be left empty in case no
	// name should be assigned to the torrent. In case it's not, the name is
	// used for the torrent as long as it doesn't have metadata. See
	// ``torrent_handle::name``.
	//
	struct TORRENT_EXPORT add_torrent_params
	{
		// The constructor can be used to initialize the storage constructor,
		// which determines the storage mechanism for the downloaded or seeding
		// data for the torrent. For more information, see the ``storage`` field.
		explicit add_torrent_params(storage_constructor_type sc = default_storage_constructor)
			: storage(sc) {}

		// values for the ``flags`` field
		enum flags_t : std::uint64_t
		{
			// If ``flag_seed_mode`` is set, libtorrent will assume that all files
			// are present for this torrent and that they all match the hashes in
			// the torrent file. Each time a peer requests to download a block,
			// the piece is verified against the hash, unless it has been verified
			// already. If a hash fails, the torrent will automatically leave the
			// seed mode and recheck all the files. The use case for this mode is
			// if a torrent is created and seeded, or if the user already know
			// that the files are complete, this is a way to avoid the initial
			// file checks, and significantly reduce the startup time.
			//
			// Setting ``flag_seed_mode`` on a torrent without metadata (a
			// .torrent file) is a no-op and will be ignored.
			//
			// If resume data is passed in with this torrent, the seed mode saved
			// in there will override the seed mode you set here.
			flag_seed_mode = 0x001,

			// If ``flag_upload_mode`` is set, the torrent will be initialized in
			// upload-mode, which means it will not make any piece requests. This
			// state is typically entered on disk I/O errors, and if the torrent
			// is also auto managed, it will be taken out of this state
			// periodically. This mode can be used to avoid race conditions when
			// adjusting priorities of pieces before allowing the torrent to start
			// downloading.
			//
			// If the torrent is auto-managed (``flag_auto_managed``), the torrent
			// will eventually be taken out of upload-mode, regardless of how it
			// got there. If it's important to manually control when the torrent
			// leaves upload mode, don't make it auto managed.
			flag_upload_mode = 0x004,

			// determines if the torrent should be added in *share mode* or not.
			// Share mode indicates that we are not interested in downloading the
			// torrent, but merely want to improve our share ratio (i.e. increase
			// it). A torrent started in share mode will do its best to never
			// download more than it uploads to the swarm. If the swarm does not
			// have enough demand for upload capacity, the torrent will not
			// download anything. This mode is intended to be safe to add any
			// number of torrents to, without manual screening, without the risk
			// of downloading more than is uploaded.
			//
			// A torrent in share mode sets the priority to all pieces to 0,
			// except for the pieces that are downloaded, when pieces are decided
			// to be downloaded. This affects the progress bar, which might be set
			// to "100% finished" most of the time. Do not change file or piece
			// priorities for torrents in share mode, it will make it not work.
			//
			// The share mode has one setting, the share ratio target, see
			// ``settings_pack::share_mode_target`` for more info.
			flag_share_mode = 0x008,

			// determines if the IP filter should apply to this torrent or not. By
			// default all torrents are subject to filtering by the IP filter
			// (i.e. this flag is set by default). This is useful if certain
			// torrents needs to be exempt for some reason, being an auto-update
			// torrent for instance.
			flag_apply_ip_filter = 0x010,

			// specifies whether or not the torrent is to be started in a paused
			// state. I.e. it won't connect to the tracker or any of the peers
			// until it's resumed. This is typically a good way of avoiding race
			// conditions when setting configuration options on torrents before
			// starting them.
			flag_paused = 0x020,

			// If the torrent is auto-managed (``flag_auto_managed``), the torrent
			// may be resumed at any point, regardless of how it paused. If it's
			// important to manually control when the torrent is paused and
			// resumed, don't make it auto managed.
			//
			// If ``flag_auto_managed`` is set, the torrent will be queued,
			// started and seeded automatically by libtorrent. When this is set,
			// the torrent should also be started as paused. The default queue
			// order is the order the torrents were added. They are all downloaded
			// in that order. For more details, see queuing_.
			//
			// If you pass in resume data, the auto_managed state of the torrent
			// when the resume data was saved will override the auto_managed state
			// you pass in here. You can override this by setting
			// ``override_resume_data``.
			flag_auto_managed = 0x040,
			flag_duplicate_is_error = 0x080,

			// on by default and means that this torrent will be part of state
			// updates when calling post_torrent_updates().
			flag_update_subscribe = 0x200,

			// sets the torrent into super seeding mode. If the torrent is not a
			// seed, this flag has no effect. It has the same effect as calling
			// ``torrent_handle::super_seeding(true)`` on the torrent handle
			// immediately after adding it.
			flag_super_seeding = 0x400,

			// sets the sequential download state for the torrent. It has the same
			// effect as calling ``torrent_handle::sequential_download(true)`` on
			// the torrent handle immediately after adding it.
			flag_sequential_download = 0x800,

			// indicates that this torrent should never be unloaded from RAM, even
			// if unloading torrents are allowed in general. Setting this makes
			// the torrent exempt from loading/unloading management.
			flag_pinned = 0x1000,

			// the stop when ready flag. Setting this flag is equivalent to calling
			// torrent_handle::stop_when_ready() immediately after the torrent is
			// added.
			flag_stop_when_ready = 0x2000,

			// when this flag is set, the tracker list in the add_torrent_params
			// object override any trackers from the torrent file. If the flag is
			// not set, the trackers from the add_torrent_params object will be
			// added to the list of trackers used by the torrent.
			flag_override_trackers = 0x4000,

			// If this flag is set, the web seeds from the add_torrent_params
			// object will override any web seeds in the torrent file. If it's not
			// set, web seeds in the add_torrent_params object will be added to the
			// list of web seeds used by the torrent.
			flag_override_web_seeds = 0x8000,

			// if this flag is set (which it is by default) the torrent will be
			// considered needing to save its resume data immediately as it's
			// added. New torrents that don't have any resume data should do that.
			// This flag is cleared by a successful call to read_resume_data()
			flag_need_save_resume = 0x10000,

#ifndef TORRENT_NO_DEPRECATE
			// If ``flag_override_resume_data`` is set, flags set for this torrent
			// in this ``add_torrent_params`` object will take precedence over
			// whatever states are saved in the resume data. For instance, the
			// ``paused``, ``auto_managed``, ``sequential_download``, ``seed_mode``,
			// ``super_seeding``, ``max_uploads``, ``max_connections``,
			// ``upload_limit`` and ``download_limit`` are all affected by this
			// flag. The intention of this flag is to have any field in
			// add_torrent_params configuring the torrent override the corresponding
			// configuration from the resume file, with the one exception of save
			// resume data, which has its own flag (for historic reasons).
			// If this flag is set, but file_priorities is empty, file priorities
			// are still loaded from the resume data, if present.
			flag_override_resume_data = 0x20000,

			// defaults to on and specifies whether tracker URLs loaded from
			// resume data should be added to the trackers in the torrent or
			// replace the trackers. When replacing trackers (i.e. this flag is not
			// set), any trackers passed in via add_torrent_params are also
			// replaced by any trackers in the resume data. The default behavior is
			// to have the resume data override the .torrent file _and_ the
			// trackers added in add_torrent_params.
			flag_merge_resume_trackers = 0x40000,

			// if this flag is set, the save path from the resume data file, if
			// present, is honored. This defaults to not being set, in which
			// case the save_path specified in add_torrent_params is always used.
			flag_use_resume_save_path = 0x80000,

			// defaults to on and specifies whether web seed URLs loaded from
			// resume data should be added to the ones in the torrent file or
			// replace them. No distinction is made between the two different kinds
			// of web seeds (`BEP 17`_ and `BEP 19`_). When replacing web seeds
			// (i.e. when this flag is not set), any web seeds passed in via
			// add_torrent_params are also replaced. The default behavior is to
			// have any web seeds in the resume data take precedence over whatever
			// is passed in here as well as the .torrent file.
			flag_merge_resume_http_seeds = 0x100000,
#endif

			// internal
			default_flags = flag_pinned | flag_update_subscribe
				| flag_auto_managed | flag_paused | flag_apply_ip_filter
				| flag_need_save_resume
#ifndef TORRENT_NO_DEPRECATE
				| flag_merge_resume_http_seeds
				| flag_merge_resume_trackers
#endif
		};

		// filled in by the constructor and should be left untouched. It is used
		// for forward binary compatibility.
		int version = LIBTORRENT_VERSION_NUM;

		// torrent_info object with the torrent to add. Unless the url or
		// info_hash is set, this is required to be initialized.
		std::shared_ptr<torrent_info> ti;

		// If the torrent doesn't have a tracker, but relies on the DHT to find
		// peers, the ``trackers`` can specify tracker URLs for the torrent.
		std::vector<std::string> trackers;

		// the tiers the URLs in ``trackers`` belong to. Trackers belonging to
		// different tiers may be treated differently, as defined by the multi
		// tracker extension. This is optional, if not specified trackers are
		// assumed to be part of tier 0, or whichever the last tier was as
		// iterating over the trackers.
		std::vector<int> tracker_tiers;

		// a list of hostname and port pairs, representing DHT nodes to be added
		// to the session (if DHT is enabled). The hostname may be an IP address.
		std::vector<std::pair<std::string, int>> dht_nodes;

		std::string name;

		// the path where the torrent is or will be stored.
		//
		// .. note::
		// 	On windows this path (and other paths) are interpreted as UNC
		// 	paths. This means they must use backslashes as directory separators
		// 	and may not contain the special directories "." or "..".
		std::string save_path;

		// One of the values from storage_mode_t. For more information, see
		// storage-allocation_.
		storage_mode_t storage_mode = storage_mode_sparse;

		// can be used to customize how the data is stored. The default storage
		// will simply write the data to the files it belongs to, but it could be
		// overridden to save everything to a single file at a specific location
		// or encrypt the content on disk for instance. For more information
		// about the storage_interface that needs to be implemented for a custom
		// storage, see storage_interface.
		storage_constructor_type storage;

		// The ``userdata`` parameter is optional and will be passed on to the
		// extension constructor functions, if any
		// (see torrent_handle::add_extension()).
		void* userdata = nullptr;

		// can be set to control the initial file priorities when adding a
		// torrent. The semantics are the same as for
		// ``torrent_handle::prioritize_files()``.
		std::vector<std::uint8_t> file_priorities;

		// torrent extension construction functions can be added to this vector
		// to have them be added immediately when the torrent is constructed.
		// This may be desired over the torrent_handle::add_extension() in order
		// to avoid race conditions. For instance it may be important to have the
		// plugin catch events that happen very early on after the torrent is
		// created.
		std::vector<std::function<std::shared_ptr<torrent_plugin>(torrent_handle const&, void*)>>
			extensions;

		// the default tracker id to be used when announcing to trackers. By
		// default this is empty, and no tracker ID is used, since this is an
		// optional argument. If a tracker returns a tracker ID, that ID is used
		// instead of this.
		std::string trackerid;

		// If you specify a ``url``, the torrent will be set in
		// ``downloading_metadata`` state until the .torrent file has been
		// downloaded. If there's any error while downloading, the torrent will
		// be stopped and the torrent error state (``torrent_status::error``)
		// will indicate what went wrong. The ``url`` may be set to a magnet link.
		std::string url;

		// flags controlling aspects of this torrent and how it's added. See
		// flags_t for details.
		//
		// .. note::
		// 	The ``flags`` field is initialized with default flags by the
		// 	constructor. In order to preserve default behavior when clearing or
		// 	setting other flags, make sure to bitwise OR or in a flag or bitwise
		// 	AND the inverse of a flag to clear it.
		std::uint64_t flags = default_flags;

		// set this to the info hash of the torrent to add in case the info-hash
		// is the only known property of the torrent. i.e. you don't have a
		// .torrent file nor a magnet link.
		sha1_hash info_hash;

		// ``max_uploads``, ``max_connections``, ``upload_limit``,
		// ``download_limit`` correspond to the ``set_max_uploads()``,
		// ``set_max_connections()``, ``set_upload_limit()`` and
		// ``set_download_limit()`` functions on torrent_handle. These values let
		// you initialize these settings when the torrent is added, instead of
		// calling these functions immediately following adding it.
		//
		// -1 means unlimited on these settings just like their counterpart
		// functions on torrent_handle
		int max_uploads = -1;
		int max_connections = -1;

		int upload_limit = -1;
		int download_limit = -1;

		// the total number of bytes uploaded and downloaded by this torrent so
		// far.
		std::int64_t total_uploaded = 0;
		std::int64_t total_downloaded = 0;

		// the number of seconds this torrent has spent in started, finished and
		// seeding state so far, respectively.
		int active_time = 0;
		int finished_time = 0;
		int seeding_time = 0;

		// if set to a non-zero value, this is the posix time of when this torrent
		// was first added, including previous runs/sessions. If set to zero, the
		// internal added_time will be set to the time of when add_torrent() is
		// called.
		std::time_t added_time = 0;
		std::time_t completed_time = 0;

		// if set to non-zero, initializes the time (expressed in posix time) when
		// we last saw a seed or peers that together formed a complete copy of the
		// torrent. If left set to zero, the internal counterpart to this field
		// will be updated when we see a seed or a distributed copies >= 1.0.
		std::time_t last_seen_complete = 0;

		// these field can be used to initialize the torrent's cached scrape data.
		// The scrape data is high level metadata about the current state of the
		// swarm, as returned by the tracker (either when announcing to it or by
		// sending a specific scrape request). ``num_complete`` is the number of
		// peers in the swarm that are seeds, or have every piece in the torrent.
		// ``num_incomplete`` is the number of peers in the swarm that do not have
		// every piece. ``num_downloaded`` is the number of times the torrent has
		// been downloaded (not initiated, but the number of times a download has
		// completed).
		//
		// Leaving any of these values set to -1 indicates we don't know, or we
		// have not received any scrape data.
		int num_complete = -1;
		int num_incomplete = -1;

		int num_downloaded = -1;

		// URLs can be added to these two lists to specify additional web
		// seeds to be used by the torrent. If the ``flag_override_web_seeds``
		// is set, these will be the _only_ ones to be used. i.e. any web seeds
		// found in the .torrent file will be overridden.
		//
		// http_seeds expects URLs to web servers implementing the original HTTP
		// seed specification `BEP 17`_.
		//
		// url_seeds expects URLs to regular web servers, aka "get right" style,
		// specified in `BEP 19`_.
		std::vector<std::string> http_seeds;
		std::vector<std::string> url_seeds;

		// peers to add to the torrent, to be tried to be connected to as
		// bittorrent peers.
		std::vector<tcp::endpoint> peers;

		// peers banned from this torrent. The will not be connected to
		std::vector<tcp::endpoint> banned_peers;

		// this is a map of partially downloaded piece. The key is the piece index
		// and the value is a bitfield where each bit represents a 16 kiB block.
		// A set bit means we have that block.
		std::map<int, bitfield> unfinished_pieces;

		// this is a bitfield indicating which pieces we already have of this
		// torrent.
		bitfield have_pieces;

		// when in seed_mode, pieces with a set bit in this bitfield have been
		// verified to be valid. Other pieces will be verified the first time a
		// peer requests it.
		bitfield verified_pieces;

		// this sets the priorities for each individual piece in the torrent. Each
		// element in the vector represent the piece with the same index. If you
		// set both file- and piece priorities, file priorities will take
		// precedence.
		std::vector<std::uint8_t> piece_priorities;

		// if this is a merkle tree torrent, and you're seeding, this field must
		// be set. It is all the hashes in the binary tree, with the root as the
		// first entry. See torrent_info::set_merkle_tree() for more info.
		std::vector<sha1_hash> merkle_tree;

		// this is a map of file indices in the torrent and new filenames to be
		// applied before the torrent is added.
		std::map<int, std::string> renamed_files;

#ifndef TORRENT_NO_DEPRECATE
		// deprecated in 1.2
		// if ``uuid`` is specified, it is used to find duplicates. If another
		// torrent is already running with the same UUID as the one being added,
		// it will be considered a duplicate. This is mainly useful for RSS feed
		// items which has UUIDs specified.
		std::string uuid;

		// The optional parameter, ``resume_data`` can be given if up to date
		// fast-resume data is available. The fast-resume data can be acquired
		// from a running torrent by calling save_resume_data() on
		// torrent_handle. See fast-resume_. The ``vector`` that is passed in
		// will be swapped into the running torrent instance with
		// ``std::vector::swap()``.
		std::vector<char> resume_data;

		// to support the deprecated use case of reading the resume data into
		// resume_data field and getting a reject alert, any parse failure is
		// communicated forward into libtorrent via this field. If this is set, a
		// fastresume_rejected_alert will be posted.
		error_code internal_resume_data_error;
#else
		// hidden
		// to maintain ABI compatibility
		std::string deprecated1;
		std::string deprecated2;
		std::vector<char> deprecated3;
		error_code deprecated4;
#endif

	};
}

#endif