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it mostly works!

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Reid 2025-05-12 23:33:52 -07:00
parent 76543fd220
commit 44cd13f10c
Signed by: reidlab
GPG key ID: DAF5EAF6665839FD
52 changed files with 879 additions and 396 deletions
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51
src/downloader/streamInfo.ts
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@ -1,30 +1,16 @@
import * as log from "../log.js";
import type { SongAttributes } from "../api/types/appleMusic/attributes.js";
import type { SongAttributes } from "../appleMusicApi/types/attributes.js";
import hls, { Item } from "parse-hls";
import axios from "axios";
import { widevine, playready, fairplay } from "../constants/keyFormats.js";
import { songCodecRegex } from "../constants/codecs.js";
import type { WebplaybackResponse } from "api/appleMusicApi.js";
import type { WebplaybackResponse } from "appleMusicApi/index.js";
import { RegularCodec, WebplaybackCodec } from "./index.js";
// why is this private
// i wish pain on the person who wrote this /j :smile:
type M3u8 = ReturnType<typeof hls.default.parse>;
// TODO: whole big thing, and a somewhat big issue
// some files can just Not be downloaded
// this is because only the fairplay (com.apple.streamingkeydelivery) key is present
// and no other drm schemes exist..
// however... there is still widevine ones ???? just tucked away... REALLY WELL
// https://github.com/glomatico/gamdl/blob/main/gamdl/downloader_song_legacy.py#L27
// bullshit, i tell you.
// havent had this issue with the small pool i tested before late 2024. what ????
// i don't get it.
// i just tried another thing from 2022 ro 2023 and it worked fine
// SOLVED. widevine keys are not always present in the m3u8 manifest that is default (you can see that in link above, thats why it exists)
// OH. it doesn't seem to give the keys you want anyway LOLLLLLLL????
// i'm sure its used for *SOMETHING* so i'll keep it
export default class StreamInfo {
public readonly trackId: string;
public readonly streamUrl: string;
@ -60,20 +46,22 @@ export default class StreamInfo {
const assetInfos = getAssetInfos(m3u8Parsed);
const playlist = await getPlaylist(m3u8Parsed, codec);
const variantId = playlist.properties[0].attributes.stableVariantId;
if (variantId === undefined) { throw "variant id does not exist!"; }
if (typeof variantId !== "string") { throw "variant id is not a string!"; }
if (variantId === undefined) { throw new Error("variant id does not exist!"); }
if (typeof variantId !== "string") { throw new Error("variant id is not a string!"); }
const drmIds = assetInfos[variantId]["AUDIO-SESSION-KEY-IDS"];
const correctM3u8Url = m3u8Url.substring(0, m3u8Url.lastIndexOf("/")) + "/" + playlist.uri;
const widevinePssh = getWidevinePssh(drmInfos, drmIds);
const playreadyPssh = getPlayreadyPssh(drmInfos, drmIds);
const fairplayKey = getFairplayKey(drmInfos, drmIds);
const trackId = trackMetadata.playParams?.id;
if (trackId === undefined) { throw "track id is missing, this may indicate your song isn't accessable w/ your subscription!"; }
if (trackId === undefined) { throw new Error("track id gone, this may indicate your song isn't accessable w/ your subscription!"); }
return new StreamInfo(
trackId,
m3u8Url, // TODO: make this keep in mind the CODEC, yt-dlp will shit itself if not supplied i think
correctM3u8Url,
widevinePssh,
playreadyPssh,
fairplayKey
@ -90,7 +78,7 @@ export default class StreamInfo {
else if (codec === WebplaybackCodec.AacLegacy) { flavor = "28:ctrp256"; }
const asset = song.assets.find((asset) => { return asset.flavor === flavor; });
if (asset === undefined) { throw "webplayback info for requested flavor doesn't exist!"; }
if (asset === undefined) { throw new Error("webplayback info for requested flavor doesn't exist!"); }
const trackId = song.songId;
@ -99,8 +87,8 @@ export default class StreamInfo {
const m3u8Parsed = hls.default.parse(m3u8.data);
const widevinePssh = m3u8Parsed.lines.find((line) => { return line.name === "key"; })?.attributes?.uri;
if (widevinePssh === undefined) { throw "widevine uri is missing!"; }
if (typeof widevinePssh !== "string") { throw "widevine uri is not a string!"; }
if (widevinePssh === undefined) { throw new Error("widevine uri is missing!"); }
if (typeof widevinePssh !== "string") { throw new Error("widevine uri is not a string!"); }
// afaik this ONLY has widevine
return new StreamInfo(
@ -122,14 +110,14 @@ function getDrmInfos(m3u8Data: M3u8): DrmInfos {
line.content.includes("com.apple.hls.AudioSessionKeyInfo")
) {
const value = line.content.match(/VALUE="([^"]+)"/);
if (!value) { throw "could not match for drm key value!"; }
if (!value[1]) { throw "drm key value is empty!"; }
if (!value) { throw new Error("could not match for drm key value!"); }
if (!value[1]) { throw new Error("drm key value is empty!"); }
return JSON.parse(Buffer.from(value[1], "base64").toString("utf-8"));
}
}
throw "m3u8 missing audio session key info!";
throw new Error("m3u8 missing audio session key info!");
}
type AssetInfos = { [key: string]: { "AUDIO-SESSION-KEY-IDS": string[]; }; }
@ -143,19 +131,16 @@ function getAssetInfos(m3u8Data: M3u8): AssetInfos {
line.content.includes("com.apple.hls.audioAssetMetadata")
) {
const value = line.content.match(/VALUE="([^"]+)"/);
if (!value) { throw "could not match for value!"; }
if (!value[1]) { throw "value is empty!"; }
if (!value) { throw new Error("could not match for value!"); }
if (!value[1]) { throw new Error("value is empty!"); }
return JSON.parse(Buffer.from(value[1], "base64").toString("utf-8"));
}
}
throw "m3u8 missing audio asset metadata!";
throw new Error("m3u8 missing audio asset metadata!");
}
// SUPER TODO: remove inquery for the codec, including its library, this is for testing
// add a config option for preferred codec ?
// or maybe in the streaminfo function
async function getPlaylist(m3u8Data: M3u8, codec: RegularCodec): Promise<Item> {
const masterPlaylists = m3u8Data.streamRenditions;
const masterPlaylist = masterPlaylists.find((playlist) => {
@ -166,7 +151,7 @@ async function getPlaylist(m3u8Data: M3u8, codec: RegularCodec): Promise<Item> {
return match !== null;
});
if (masterPlaylist === undefined) { throw "no master playlist for codec found!"; }
if (masterPlaylist === undefined) { throw new Error("no master playlist for codec found!"); }
return masterPlaylist;
}