320/flac now epically bacc?!?!?!?1?1

index.html

@@ -31,7 +31,7 @@
         <p>params are:</p>
         <p><b>t: tagging</b>, boolean</p>
         <p><b>f: format</b>, can be one of these:</p>
-        <p>aac_96, 64, 128, 320, mp4_ra1, mp4_ra2, mp4_ra3, mhm1_ra1, mhm1_ra2, mhm1, sbc_256, misc</p>
+        <p>aac_96, 64, 128, 320, flac, mp4_ra1, mp4_ra2, mp4_ra3, mhm1_ra1, mhm1_ra2, mhm1, sbc_256, misc</p>
         <p>available formats depend on the track</p>
     </body>
 </html>

index.js

@@ -10,6 +10,7 @@ const format_string_to_num = {
     '64': '10',
     '128': '1',
     '320': '3',
+    'flac': '9',
     'mp4_ra1': '13',
     'mp4_ra2': '14',
     'mp4_ra3': '15',
@@ -21,18 +22,6 @@ const format_string_to_num = {
 }
 
 async function handler(type, request) {
-    access_token = await KV.get('access_token')
-    if (access_token === null) {
-        const response = await fetch('https://connect.deezer.com/oauth/access_token.php?grant_type=client_credentials&client_id=447462&client_secret=a83bf7f38ad2f137e444727cfc3775cf&output=json')
-        const json = await response.json()
-        if (json.error !== undefined) {
-            return new Response("Couldn't get access token from Deezer", { status: 500, headers: { 'content-type': 'text/plain' } })
-        }
-
-        access_token = json.access_token
-        await KV.put('access_token', access_token, { expirationTtl: parseInt(json.expires) })
-    }
-
     const url = new URL(request.url)
     const id = url.pathname.split('/')[2]
 
@@ -51,19 +40,19 @@ async function handler(type, request) {
     }
 
     let tagging = url.searchParams.get('t')
-    tagging = tagging === 'true' || tagging === '1'
+    tagging = (tagging === 'true' || tagging === '1') && ['misc', '128', '320'].includes(format)
 
     switch (type) {
         case 'track':
-            return await track(id, format, access_token, tagging)
+            return await track(id, format, tagging)
         case 'album':
         case 'playlist':
-            return await m3u8(type, id, format, access_token, tagging, url.host)
+            return await m3u8(type, id, format, tagging, url.host)
     }
 }
 
-async function track(id, format, access_token, tagging) {
+async function track(id, format, tagging) {
-    const response = await fetch(`https://api.deezer.com/track/${id}?access_token=${access_token}`)
+    const response = await fetch(`https://api.deezer.com/streaming_url.php?access_token=${ACCESS_TOKEN}&track_id=${id}`)
     const json = await response.json()
     if (json.error !== undefined) {
         return new Response(JSON.stringify(json.error), { status: 403, headers: { 'content-type': "application/json" } })
@@ -71,14 +60,29 @@ async function track(id, format, access_token, tagging) {
 
     const wasm = await import('./pkg')
 
-    result = await track_url(json, format, wasm.stream_url)
+    encrypted = !['320', 'flac'].includes(format)
-    if (typeof result === 'object') {
+    if (!encrypted) {     // server-side stream url
-        return result
+        // TODO: handle alternatives
+        result = json['url_' + format]
+
+        if (result === undefined) {
+            return new Response('Format unavailable', { status: 403, headers: { 'content-type': 'text/plain' } })
+        }
+
+        result = wasm.decrypt_stream_url(result)
+    } else {    // legacy stream url
+        result = await legacy_track_url(json, format, wasm.legacy_stream_url)
+        if (typeof result === 'object') {
+            return result
+        }
     }
 
-    const track = await fetch(result)
+    let track
-    if (track.status !== 200) {
+    if (tagging || encrypted) {
-        return new Response("Couldn't get track stream", { status: 403, headers: { 'content-type': 'text/plain' } })
+        track = await fetch(result)
+        if (track.status !== 200) {
+            return new Response("Couldn't get track stream", { status: 403, headers: { 'content-type': 'text/plain' } })
+        }
     }
 
     let id3
@@ -136,9 +140,12 @@ async function track(id, format, access_token, tagging) {
     }
 
     let { readable, writable } = new TransformStream()
-    const writer = writable.getWriter()
+    let writer
+    if (tagging || encrypted) {
+        writer = writable.getWriter()
+    }
 
-    if (id3) {
+    if (tagging) {
         writer.write(id3.arrayBuffer)
     }
 
@@ -146,12 +153,17 @@ async function track(id, format, access_token, tagging) {
     if (json.alternative) {
         id = json.alternative.id.toString()
     }
-
-    const cipher = new wasm.Cipher(id)
-
-    const length = parseInt(track.headers.get('Content-Length'))
     
-    pipeDecryptedStream(writer, track.body, length, cipher)
+    if (encrypted) {
+        const cipher = new wasm.Cipher(id)
+        const length = parseInt(track.headers.get('Content-Length'))
+        pipeDecryptedStream(writer, track.body, length, cipher)
+    } else if (tagging) {
+        writer.releaseLock()
+        track.body.pipeTo(writable)
+    } else {
+        return new Response(null, { status: 302, headers: { 'location': result } })
+    }
 
     return new Response(readable, { status: 200, headers: { 'content-type': 'audio/mpeg' } })
 }
@@ -191,7 +203,7 @@ async function pipeDecryptedStream(writer, body, length, cipher) {
     await writer.close()
 }
 
-function track_url(json, format, url_func) {
+function legacy_track_url(json, format, url_func) {
     // needed if track has fallback, like https://www.deezer.com/track/11835714
     if (json.alternative) {
         json = json.alternative
@@ -214,8 +226,8 @@ function track_url(json, format, url_func) {
     return url_func(md5_origin, format, id.toString(), media_version)
 }
 
-async function m3u8(type, id, format, access_token, tagging, host) {
+async function m3u8(type, id, format, tagging, host) {
-    const response = await fetch(`https://api.deezer.com/${type}/${id}?access_token=${access_token}&limit=-1`)
+    const response = await fetch(`https://api.deezer.com/${type}/${id}?access_token=${ACCESS_TOKEN}&limit=-1`)
     const json = await response.json()
     if (json.error !== undefined) {
         return new Response(JSON.stringify(json.error), { status: 403, headers: { 'content-type': "application/json" } })

src/lib.rs

@@ -1,13 +1,14 @@
 use wasm_bindgen::prelude::*;
 
 use blowfish::Blowfish;
-use aes::Aes128;
+use aes::{Aes128, Aes256};
 use block_modes::{BlockMode, Cbc, Ecb};
 use block_modes::block_padding::{NoPadding, ZeroPadding};
 use md5::{Md5, Digest};
 
 type BfCbc = Cbc<Blowfish, NoPadding>;
 type Aes128Ecb = Ecb<Aes128, ZeroPadding>;
+type Aes256Ecb = Ecb<Aes256, ZeroPadding>;
 
 const TRACK_CDN_KEY: [u8; 16] = [106, 111, 54, 97, 101, 121, 54, 104, 97, 105, 100, 50, 84, 101, 105, 104];
 const BF_SECRET: [u8; 16] = [103, 52, 101, 108, 53, 56, 119, 99, 48, 122, 118, 102, 57, 110, 97, 49];
@@ -36,7 +37,7 @@ impl Cipher {
 }
 
 #[wasm_bindgen]
-pub fn stream_url(md5_origin: &str, format: &str, id: &str, media_version: u8) -> String {
+pub fn legacy_stream_url(md5_origin: &str, format: &str, id: &str, media_version: u8) -> String {
     // md5 origin + format num + id + media version
     let metadata = [
         md5_origin.as_bytes(),
@@ -62,4 +63,12 @@ pub fn stream_url(md5_origin: &str, format: &str, id: &str, media_version: u8) -
     let ciphertext = cipher.encrypt_vec(&metadata_hash);
 
     format!("https://cdns-proxy-{}.dzcdn.net/mobile/1/{}", md5_origin.chars().next().unwrap(), hex::encode(ciphertext))
+}
+
+#[wasm_bindgen]
+pub fn decrypt_stream_url(url: &str) -> String {
+    let url = hex::decode(url).unwrap();
+    let cipher = Aes256Ecb::new_from_slices("2f5b4c9785ddc367975b83d90dc46f5c".as_bytes(), Default::default()).unwrap();
+    let url = cipher.decrypt_vec(&url).unwrap();
+    String::from_utf8_lossy(&url).into_owned()
 }

wrangler.toml

@@ -3,6 +3,4 @@ type = "webpack"
 webpack_config = "webpack.config.js"
 account_id = "03479b0523a52b140e0dabac40cb0fc8"
 workers_dev = true
-kv_namespaces = [
+vars = { ACCESS_TOKEN = "haha nope" }
-    { binding = "KV", id = "974c0967a84e415daa054bbbcc7f80c6", preview_id = "cfcc6491f3484cbca664913836635113" }
-]