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removed extra HEAD request for filesize with shoddy af code, updated compat date

This commit is contained in:
uh wot 2022-04-13 22:58:56 +02:00
parent 80c9ddf1bb
commit 7b00c3560d
Signed by: uhwot
GPG Key ID: CB2454984587B781
4 changed files with 77 additions and 61 deletions
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4
dist/worker.js vendored
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File diff suppressed because one or more lines are too long

124
index.js
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@ -189,13 +189,16 @@ async function track(id, format, tagging, range_header) {
return new Response('Format unavailable', { status: 403, headers: { 'content-type': 'text/plain' } })
}
let range_start = null
let range_end = null
let range_req = false
let range_start = 0
let range_end = NaN
if (range_header !== null) {
const range_match = range_header.match(/^bytes=(\d+)-(\d*)/)
const range_match = range_header.match(/^bytes=(\d*)-(\d*)/)
if (range_match !== null) {
range_start = parseInt(range_match[1])
range_end = parseInt(range_match[2])
range_req = true
}
}
@ -252,7 +255,7 @@ async function track(id, format, tagging, range_header) {
let title = json.SNG_TITLE
if (json.VERSION) title += ` ${json.VERSION}`
let init = {}
let init = { method: 'GET', headers: {} }
let resp_init = {
status: 200,
headers: {
@ -262,20 +265,8 @@ async function track(id, format, tagging, range_header) {
}
}
// filesize from the API isn't always the actual filesize,
// so we get it with a HEAD request instead
// example: https://www.deezer.com/track/7703895
let track_size
let track_head = await fetch(track_url, {method: 'HEAD'})
if (track_head.status !== 200) {
return new Response("Couldn't get track stream", { status: 403, headers: { 'content-type': 'text/plain' } })
} else {
track_size = parseInt(track_head.headers.get('content-length'))
}
let resp_size = track_size
let id3_buffer
let id3_len = 0
if (tagging) {
let id3 = new ID3Writer(Buffer.alloc(0));
id3.padding = 0
@ -326,75 +317,100 @@ async function track(id, format, tagging, range_header) {
id3.addTag();
id3_buffer = id3.arrayBuffer
resp_size += id3_buffer.byteLength
id3_len = id3_buffer.byteLength
}
let skip_id3 = false
let skip_stream = false
let fixed_range_start = 0
let fixed_range_end = track_size
let trk_range_start = 0
let trk_range_end = NaN
let bytes_remove_start = 0
let bytes_remove_end = 0
if (range_start !== null) {
if (isNaN(range_end)) {
range_end = resp_size
} else {
if (range_req) {
if (isNaN(range_start)) {
range_start = 0
}
if (!isNaN(range_end)) {
range_end++
}
if (range_start < 0 || range_start > resp_size || range_end < range_start || range_end > resp_size) {
return new Response('Range invalid', { status: 416, headers: { 'content-type': 'text/plain' } })
if (range_start < 0 || range_end < range_start) {
return new Response('Invalid range', { status: 416, headers: { 'content-type': 'text/plain' } })
}
let orig_range_start = range_start
let orig_range_end = range_end
trk_range_start = range_start
trk_range_end = range_end
if (tagging) {
let id3_len = id3_buffer.byteLength
if (range_start < id3_len) {
if (trk_range_start < id3_len) {
let bytes_remove_id3_end = undefined
if (range_end < id3_len) {
bytes_remove_id3_end = id3_len - (id3_len - range_end)
if (trk_range_end < id3_len && !isNaN(trk_range_end)) {
bytes_remove_id3_end = id3_len - (id3_len - trk_range_end)
skip_stream = true
} else {
range_end -= id3_len
range_start = 0
trk_range_end -= id3_len
}
id3_buffer = id3_buffer.slice(range_start, bytes_remove_id3_end)
id3_buffer = id3_buffer.slice(trk_range_start, bytes_remove_id3_end)
trk_range_start = 0
} else {
skip_id3 = true
range_start -= id3_len
range_end -= id3_len
trk_range_start -= id3_len
trk_range_end -= id3_len
}
}
if (!skip_stream) {
bytes_remove_start = range_start % 2048
bytes_remove_end = 2048 - range_end % 2048
bytes_remove_start = trk_range_start % 2048
bytes_remove_end = 2048 - trk_range_end % 2048
fixed_range_start = range_start - bytes_remove_start
fixed_range_end = range_end + bytes_remove_end
if (fixed_range_end >= track_size) {
fixed_range_end = track_size
bytes_remove_end = 0
trk_range_start -= bytes_remove_start
trk_range_end += bytes_remove_end
let tmp_trk_range_end = trk_range_end
if (isNaN(tmp_trk_range_end)) {
tmp_trk_range_end = ''
} else {
tmp_trk_range_end--
}
init = { headers: new Headers({ range: `bytes=${fixed_range_start}-${fixed_range_end - 1}` }) }
init.headers.range = `bytes=${trk_range_start}-${tmp_trk_range_end}`
} else {
init.method = 'HEAD'
}
resp_init.status = 206
resp_init.headers['content-range'] = `bytes ${orig_range_start}-${orig_range_end - 1}/${resp_size}`
resp_size = orig_range_end - orig_range_start
}
let track
if (!skip_stream) {
track = await fetch(track_url, init)
if (![200, 206].includes(track.status)) {
if (track.status === 416) {
return new Response('Invalid range', { status: 416, headers: { 'content-type': 'text/plain' } })
}
return new Response("Couldn't get track stream", { status: 403, headers: { 'content-type': 'text/plain' } })
}
let track_size
if (!range_req || skip_stream) {
track_size = parseInt(track.headers.get('content-length'))
} else {
const range_header_match = track.headers.get('content-range').match(/^bytes (\d+)-(\d+)\/(\d+)/)
track_size = parseInt(range_header_match[3])
}
if (isNaN(range_end)) {
range_end = track_size + id3_len
trk_range_end = track_size
}
let resp_size = range_end - range_start
if (range_req) {
if (trk_range_end >= track_size) {
bytes_remove_end = 0
}
resp_init.status = 206
resp_init.headers['content-range'] = `bytes ${range_start}-${range_end - 1}/${track_size + id3_len}`
}
let { readable, writable } = new FixedLengthStream(resp_size)
@ -412,7 +428,7 @@ async function track(id, format, tagging, range_header) {
const cipher = new wasm.Cipher(String(id))
pipeDecryptedStream(writer, track.body, fixed_range_end, cipher, fixed_range_start, bytes_remove_start, bytes_remove_end)
pipeDecryptedStream(writer, track.body, trk_range_end, cipher, trk_range_start, bytes_remove_start, bytes_remove_end)
} else {
writer.close()
}
@ -420,9 +436,8 @@ async function track(id, format, tagging, range_header) {
return new Response(readable, resp_init)
}
async function pipeDecryptedStream(writer, body, length, cipher, fixed_range_start, bytes_remove_start, bytes_remove_end) {
async function pipeDecryptedStream(writer, body, length, cipher, byte_count, bytes_remove_start, bytes_remove_end) {
const reader = body.getReader({ mode: 'byob' })
let byte_count = fixed_range_start
let end = false
while (!end) {
@ -447,6 +462,7 @@ async function pipeDecryptedStream(writer, body, length, cipher, fixed_range_sta
byte_count += 2048
}
reader.cancel()
writer.close()
}

2
package.json
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@ -12,7 +12,7 @@
"devDependencies": {
"@wasm-tool/wasm-pack-plugin": "^1.6.0",
"html-loader": "^1.3.2",
"prettier": "^2.6.1"
"prettier": "^2.6.2"
},
"dependencies": {
"browser-id3-writer": "^4.4.0",

2
wrangler.toml
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@ -6,7 +6,7 @@ workers_dev = true
kv_namespaces = [
{ binding = "KV", id = "974c0967a84e415daa054bbbcc7f80c6", preview_id = "cfcc6491f3484cbca664913836635113" }
]
compatibility_date = "2022-03-29"
compatibility_date = "2022-04-13"
# [secrets]
# ARL