forked from NinjaCheetah/NUSGet
146 lines
7.8 KiB
Python
146 lines
7.8 KiB
Python
# "modules/download_dsi.py", licensed under the MIT license
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# Copyright 2024 NinjaCheetah
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import os
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import pathlib
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from typing import List, Tuple
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import libTWLPy
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def run_nus_download_dsi(out_folder: pathlib.Path, tid: str, version: str, pack_tad_chkbox: bool, keep_enc_chkbox: bool,
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decrypt_contents_chkbox: bool, use_local_chkbox: bool, tad_file_name: str,
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progress_callback=None):
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# Actual NUS download function that runs in a separate thread, but DSi flavored.
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# Immediately knock out any invalidly formatted Title IDs.
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if len(tid) != 16:
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return -1
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# An error here is acceptable, because it may just mean the box is empty. Or the version string is nonsense.
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# Either way, just fall back on downloading the latest version of the title.
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try:
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title_version = int(version)
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except ValueError:
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title_version = None
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# Set variables for these two options so that their state can be compared against the user's choices later.
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pack_tad_enabled = pack_tad_chkbox
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decrypt_contents_enabled = decrypt_contents_chkbox
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# Create a new libTWLPy Title.
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title = libTWLPy.Title()
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# Make a directory for this title if it doesn't exist.
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title_dir = pathlib.Path(os.path.join(out_folder, tid))
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if not title_dir.is_dir():
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title_dir.mkdir()
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# Announce the title being downloaded, and the version if applicable.
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if title_version is not None:
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progress_callback.emit("Downloading title " + tid + " v" + str(title_version) + ", please wait...")
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else:
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progress_callback.emit("Downloading title " + tid + " vLatest, please wait...")
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progress_callback.emit(" - Downloading and parsing TMD...")
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# Download a specific TMD version if a version was specified, otherwise just download the latest TMD.
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try:
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if title_version is not None:
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title.load_tmd(libTWLPy.download_tmd(tid, title_version))
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else:
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title.load_tmd(libTWLPy.download_tmd(tid))
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title_version = title.tmd.title_version
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# If libTWLPy returns an error, that means that either the TID or version doesn't exist, so return code -2.
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except ValueError:
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return -2
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# Make a directory for this version if it doesn't exist.
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version_dir = pathlib.Path(os.path.join(title_dir, str(title_version)))
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if not version_dir.is_dir():
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version_dir.mkdir()
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# Write out the TMD to a file.
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tmd_out = open(os.path.join(version_dir, "tmd." + str(title_version)), "wb")
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tmd_out.write(title.tmd.dump())
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tmd_out.close()
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# Use a local ticket, if one exists and "use local files" is enabled.
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if use_local_chkbox is True and os.path.exists(os.path.join(version_dir, "tik")):
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progress_callback.emit(" - Parsing local copy of Ticket...")
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local_ticket = open(os.path.join(version_dir, "tik"), "rb")
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title.load_ticket(local_ticket.read())
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else:
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progress_callback.emit(" - Downloading and parsing Ticket...")
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try:
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title.load_ticket(libTWLPy.download_ticket(tid))
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ticket_out = open(os.path.join(version_dir, "tik"), "wb")
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ticket_out.write(title.ticket.dump())
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ticket_out.close()
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except ValueError:
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# If libTWLPy returns an error, then no ticket is available. Log this, and disable options requiring a
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# ticket so that they aren't attempted later.
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progress_callback.emit(" - No Ticket is available!")
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pack_tad_enabled = False
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decrypt_contents_enabled = False
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# Load the content record from the TMD, and download the content it lists. DSi titles only have one content.
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title.load_content_records()
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content_file_name = hex(title.tmd.content_record.content_id)[2:]
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while len(content_file_name) < 8:
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content_file_name = "0" + content_file_name
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# Check for a local copy of the current content if "use local files" is enabled, and use it.
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if use_local_chkbox is True and os.path.exists(os.path.join(version_dir, content_file_name)):
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progress_callback.emit(" - Using local copy of content")
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local_file = open(os.path.join(version_dir, content_file_name), "rb")
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content = local_file.read()
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else:
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progress_callback.emit(" - Downloading content (Content ID: " + str(title.tmd.content_record.content_id) +
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", Size: " + str(title.tmd.content_record.content_size) + " bytes)...")
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content = libTWLPy.download_content(tid, title.tmd.content_record.content_id)
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progress_callback.emit(" - Done!")
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# If keep encrypted contents is on, write out each content after its downloaded.
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if keep_enc_chkbox is True:
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enc_content_out = open(os.path.join(version_dir, content_file_name), "wb")
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enc_content_out.write(content)
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enc_content_out.close()
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title.content.content = content
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# If decrypt local contents is still true, decrypt each content and write out the decrypted file.
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if decrypt_contents_enabled is True:
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try:
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progress_callback.emit(" - Decrypting content (Content ID: " + str(title.tmd.content_record.content_id)
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+ ")...")
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dec_content = title.get_content()
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content_file_name = hex(title.tmd.content_record.content_id)[2:]
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while len(content_file_name) < 8:
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content_file_name = "0" + content_file_name
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content_file_name = content_file_name + ".app"
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dec_content_out = open(os.path.join(version_dir, content_file_name), "wb")
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dec_content_out.write(dec_content)
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dec_content_out.close()
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except ValueError:
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# If libWiiPy throws an error during decryption, return code -3. This should only be possible if using
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# local encrypted contents that have been altered at present.
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return -3
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# If pack TAD is still true, pack the TMD, ticket, and content into a TAD.
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if pack_tad_enabled is True:
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# Get the TAD certificate chain, courtesy of libTWLPy.
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progress_callback.emit(" - Building certificate...")
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title.tad.set_cert_data(libTWLPy.download_cert())
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# Use a typed TAD name if there is one, and auto generate one based on the TID and version if there isn't.
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progress_callback.emit("Packing TAD...")
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if tad_file_name != "" and tad_file_name is not None:
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if tad_file_name[-4:] != ".tad":
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tad_file_name = tad_file_name + ".tad"
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else:
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tad_file_name = tid + "-v" + str(title_version) + ".tad"
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# Have libTWLPy dump the TAD, and write that data out.
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file = open(os.path.join(version_dir, tad_file_name), "wb")
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file.write(title.dump_tad())
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file.close()
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progress_callback.emit("Download complete!")
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# This is where the variables come in. If the state of these variables doesn't match the user's choice by this
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# point, it means that they enabled decryption or TAD packing for a title that doesn't have a ticket. Return
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# code 1 so that a warning popup is shown informing them of this.
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if (not pack_tad_enabled and pack_tad_chkbox) or (not decrypt_contents_enabled and decrypt_contents_chkbox):
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return 1
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return 0
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def run_nus_download_dsi_batch(out_folder: pathlib.Path, titles: List[Tuple[str, str]], pack_tad_chkbox: bool, keep_enc_chkbox: bool,
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decrypt_contents_chkbox: bool, use_local_chkbox: bool, progress_callback=None):
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for title in titles:
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result = run_nus_download_dsi(out_folder, title[0], title[1], pack_tad_chkbox, keep_enc_chkbox, decrypt_contents_chkbox, use_local_chkbox, None, progress_callback)
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if result != 0:
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return result
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progress_callback.emit(f"Batch download finished.")
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return 0
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