WIP

.gitignore

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+/target
+**/*.rs.bk

src/main.rs

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+extern crate tokio_core;
+extern crate regex;
+extern crate librespot_core;
+extern crate librespot_metadata;
+extern crate librespot_audio;
+#[macro_use]
+extern crate log;
+extern crate env_logger;
+extern crate scoped_threadpool;
+
+use std::time::Duration;
+use std::env;
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::io::{self, Read, BufRead, Result};
+use tokio_core::reactor::Core;
+use regex::Regex;
+use env_logger::{Builder, Env};
+use scoped_threadpool::Pool;
+
+use librespot_core::authentication::Credentials;
+use librespot_core::config::SessionConfig;
+use librespot_core::session::Session;
+use librespot_core::spotify_id::SpotifyId;
+use librespot_metadata::{Metadata, FileFormat, Track, Artist};
+use librespot_audio::{AudioDecrypt, AudioFile};
+
+fn main() {
+    Builder::from_env(Env::default().default_filter_or("info")).init();
+
+    let args: Vec<_> = env::args().collect();
+    assert!(args.len() == 3, "Usage: {} USERNAME PASSWORD < tracks_file", args[0]);
+
+    let mut core = Core::new().unwrap();
+    let handle = core.handle();
+    let session_config = SessionConfig::default();
+    let credentials = Credentials::with_password(args[1].to_owned(), args[2].to_owned());
+    info!("Connecting ...");
+    let session = core
+        .run(Session::connect(session_config, credentials, None, handle))
+        .unwrap();
+    info!("Connected!");
+
+    let mut threadpool = Pool::new(1);
+
+    let spotify_uri = Regex::new(r"spotify:track:([[:alnum:]]+)").unwrap();
+    let spotify_url = Regex::new(r"open\.spotify\.com/track/([[:alnum:]]+)").unwrap();
+
+    io::stdin().lock().lines()
+        .filter_map(|line|
+            line.ok().and_then(|str|
+                spotify_uri.captures(&str).or(spotify_url.captures(&str))
+                    .or_else(|| { warn!("Cannot parse track from string {}", str); None })
+                    .and_then(|capture|SpotifyId::from_base62(&capture[1]).ok())))
+        .for_each(|id|{
+            info!("Getting track {}...", id.to_base62());
+            let track = core.run(Track::get(&session, id)).expect("Cannot get track metadata");
+            let artists_strs: Vec<_> = track.artists.iter().map(|id|core.run(Artist::get(&session, *id)).expect("Cannot get artist metadata").name).collect();
+            let artists_display = artists_strs.join(", ");
+            let fname = format!("{} - {}.ogg", artists_display, track.name);
+            debug!("File formats: {}", track.files.keys().map(|filetype|format!("{:?}", filetype)).collect::<Vec<_>>().join(" "));
+            let file_id = track.files.get(&FileFormat::OGG_VORBIS_320)
+                .or(track.files.get(&FileFormat::OGG_VORBIS_160))
+                .or(track.files.get(&FileFormat::OGG_VORBIS_320))
+                .expect("Could not find a OGG_VORBIS format for the track.");
+            let key = core.run(session.audio_key().request(track.id, *file_id)).expect("Cannot get audio key");
+            let mut encrypted_file = core.run(AudioFile::open(&session, *file_id)).unwrap();
+            let mut buffer = Vec::new();
+            let mut read_all: Result<usize> = Ok(0);
+            let fetched = AtomicBool::new(false);
+            threadpool.scoped(|scope|{
+                scope.execute(||{
+                    read_all = encrypted_file.read_to_end(&mut buffer);
+                    fetched.store(true, Ordering::Release);
+                });
+                while !fetched.load(Ordering::Acquire) {
+                    core.turn(Some(Duration::from_millis(100)));
+                }
+            });
+            read_all.expect("Cannot read file stream");
+            let mut decrypted_buffer = Vec::new();
+            AudioDecrypt::new(key, &buffer[..]).read_to_end(&mut decrypted_buffer).expect("Cannot decrypt stream");
+            std::fs::write(&fname, &decrypted_buffer[0xa7..]).expect("Cannot write decrypted track");
+            info!("Filename: {}", fname);
+        });
+}