Add artist metadata fields (#69)

Closes #54

Reviewed-on: https://git.wojciechkozlowski.eu/wojtek/musichoard/pulls/69

Cargo.lock

@@ -184,6 +184,15 @@ dependencies = [
  "num-traits",
 ]
 
+[[package]]
+name = "form_urlencoded"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a9c384f161156f5260c24a097c56119f9be8c798586aecc13afbcbe7b7e26bf8"
+dependencies = [
+ "percent-encoding",
+]
+
 [[package]]
 name = "fragile"
 version = "2.0.0"
@@ -225,6 +234,16 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fed44880c466736ef9a5c5b5facefb5ed0785676d0c02d612db14e54f0d84286"
 
+[[package]]
+name = "idna"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e14ddfc70884202db2244c223200c204c2bda1bc6e0998d11b5e024d657209e6"
+dependencies = [
+ "unicode-bidi",
+ "unicode-normalization",
+]
+
 [[package]]
 name = "instant"
 version = "0.1.12"
@@ -356,6 +375,7 @@ dependencies = [
  "structopt",
  "tempfile",
  "tokio",
+ "url",
  "uuid",
 ]
 
@@ -436,6 +456,12 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "percent-encoding"
+version = "2.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "478c572c3d73181ff3c2539045f6eb99e5491218eae919370993b890cdbdd98e"
+
 [[package]]
 name = "pin-project-lite"
 version = "0.2.9"
@@ -801,6 +827,21 @@ dependencies = [
  "syn 2.0.11",
 ]
 
+[[package]]
+name = "tinyvec"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87cc5ceb3875bb20c2890005a4e226a4651264a5c75edb2421b52861a0a0cb50"
+dependencies = [
+ "tinyvec_macros",
+]
+
+[[package]]
+name = "tinyvec_macros"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
+
 [[package]]
 name = "tokio"
 version = "1.27.0"
@@ -859,12 +900,27 @@ dependencies = [
  "syn 1.0.109",
 ]
 
+[[package]]
+name = "unicode-bidi"
+version = "0.3.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "92888ba5573ff080736b3648696b70cafad7d250551175acbaa4e0385b3e1460"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e5464a87b239f13a63a501f2701565754bae92d243d4bb7eb12f6d57d2269bf4"
 
+[[package]]
+name = "unicode-normalization"
+version = "0.1.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c5713f0fc4b5db668a2ac63cdb7bb4469d8c9fed047b1d0292cc7b0ce2ba921"
+dependencies = [
+ "tinyvec",
+]
+
 [[package]]
 name = "unicode-segmentation"
 version = "1.10.1"
@@ -877,6 +933,18 @@ version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c0edd1e5b14653f783770bce4a4dabb4a5108a5370a5f5d8cfe8710c361f6c8b"
 
+[[package]]
+name = "url"
+version = "2.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0d68c799ae75762b8c3fe375feb6600ef5602c883c5d21eb51c09f22b83c4643"
+dependencies = [
+ "form_urlencoded",
+ "idna",
+ "percent-encoding",
+ "serde",
+]
+
 [[package]]
 name = "uuid"
 version = "1.3.0"

Cargo.toml

@@ -13,6 +13,7 @@ serde = { version = "1.0.159", features = ["derive"] }
 serde_json = { version = "1.0.95", optional = true}
 structopt = { version = "0.3.26", optional = true}
 tokio = { version = "1.27.0", features = ["rt"], optional = true}
+url = { version = "2.3.1", features = ["serde"] }
 uuid = { version = "1.3.0", features = ["serde"] }
 
 [dev-dependencies]

src/database/json/mod.rs

@@ -67,7 +67,22 @@ mod tests {
 
     use super::*;
 
-    use crate::{tests::COLLECTION, Artist, ArtistId, Collection, Format};
+    use crate::{tests::COLLECTION, Artist, ArtistId, Collection, Format, IUrl};
+
+    fn opt_to_url<U: IUrl>(opt: &Option<U>) -> String {
+        match opt {
+            Some(mb) => format!("\"{}\"", mb.url()),
+            None => String::from("null"),
+        }
+    }
+
+    fn vec_to_urls<U: IUrl>(vec: &Vec<U>) -> String {
+        let mut urls: Vec<String> = vec![];
+        for item in vec.iter() {
+            urls.push(format!("\"{}\"", item.url()));
+        }
+        format!("[{}]", urls.join(","))
+    }
 
     fn artist_to_json(artist: &Artist) -> String {
         let album_artist = &artist.id.name;
@@ -114,11 +129,25 @@ mod tests {
         }
         let albums = albums.join(",");
 
+        let musicbrainz = opt_to_url(&artist.properties.musicbrainz);
+        let musicbutler = vec_to_urls(&artist.properties.musicbutler);
+        let bandcamp = vec_to_urls(&artist.properties.bandcamp);
+        let qobuz = opt_to_url(&artist.properties.qobuz);
+
+        let properties = format!(
+            "{{\
+             \"musicbrainz\":{musicbrainz},\
+             \"musicbutler\":{musicbutler},\
+             \"bandcamp\":{bandcamp},\
+             \"qobuz\":{qobuz}\
+             }}"
+        );
+
         format!(
             "{{\
-             \"id\":{{\
+             \"id\":{{\"name\":\"{album_artist}\"}},\
-             \"name\":\"{album_artist}\"\
+             \"properties\":{properties},\
-             }},\"albums\":[{albums}]\
+             \"albums\":[{albums}]\
              }}"
         )
     }

src/lib.rs

@@ -14,10 +14,182 @@ use std::{
 use database::IDatabase;
 use library::{ILibrary, Item, Query};
 use serde::{Deserialize, Serialize};
+use url::Url;
 use uuid::Uuid;
 
-/// [MusicBrainz Identifier](https://musicbrainz.org/doc/MusicBrainz_Identifier) (MBID).
+/// An object with the [`IUrl`] trait contains a valid URL.
-pub type Mbid = Uuid;
+pub trait IUrl {
+    fn url(&self) -> &str;
+}
+
+/// An object with the [`IMbid`] trait contains a [MusicBrainz
+/// Identifier](https://musicbrainz.org/doc/MusicBrainz_Identifier) (MBID).
+pub trait IMbid {
+    fn mbid(&self) -> &str;
+}
+
+#[derive(Debug)]
+enum UrlType {
+    MusicBrainz,
+    MusicButler,
+    Bandcamp,
+    Qobuz,
+}
+
+struct InvalidUrlError {
+    url_type: UrlType,
+    url: String,
+}
+
+impl fmt::Display for InvalidUrlError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "invalid url of type {:?}: {}", self.url_type, self.url)
+    }
+}
+
+/// MusicBrainz reference.
+#[derive(Clone, Debug, Deserialize, Serialize, PartialEq, Eq)]
+pub struct MusicBrainz(Url);
+
+impl MusicBrainz {
+    pub fn new<S: AsRef<str>>(url: S) -> Result<Self, Error> {
+        let url = Url::parse(url.as_ref())?;
+
+        if !url
+            .domain()
+            .map(|u| u.ends_with("musicbrainz.org"))
+            .unwrap_or(false)
+        {
+            return Err(Self::invalid_url_error(url).into());
+        }
+
+        match url.path_segments().and_then(|mut ps| ps.nth(1)) {
+            Some(segment) => Uuid::try_parse(segment)?,
+            None => return Err(Self::invalid_url_error(url).into()),
+        };
+
+        Ok(MusicBrainz(url))
+    }
+
+    fn invalid_url_error<S: Into<String>>(url: S) -> InvalidUrlError {
+        InvalidUrlError {
+            url_type: UrlType::MusicBrainz,
+            url: url.into(),
+        }
+    }
+}
+
+impl IUrl for MusicBrainz {
+    fn url(&self) -> &str {
+        self.0.as_str()
+    }
+}
+
+impl IMbid for MusicBrainz {
+    fn mbid(&self) -> &str {
+        // The URL is assumed to have been validated.
+        self.0.path_segments().and_then(|mut ps| ps.nth(1)).unwrap()
+    }
+}
+
+/// MusicButler reference.
+#[derive(Clone, Debug, Deserialize, Serialize, PartialEq, Eq)]
+pub struct MusicButler(Url);
+
+impl MusicButler {
+    pub fn new<S: AsRef<str>>(url: S) -> Result<Self, Error> {
+        let url = Url::parse(url.as_ref())?;
+
+        if !url
+            .domain()
+            .map(|u| u.ends_with("musicbutler.io"))
+            .unwrap_or(false)
+        {
+            return Err(Self::invalid_url_error(url).into());
+        }
+
+        Ok(MusicButler(url))
+    }
+
+    fn invalid_url_error<S: Into<String>>(url: S) -> InvalidUrlError {
+        InvalidUrlError {
+            url_type: UrlType::MusicButler,
+            url: url.into(),
+        }
+    }
+}
+
+impl IUrl for MusicButler {
+    fn url(&self) -> &str {
+        self.0.as_str()
+    }
+}
+
+/// Bandcamp reference.
+#[derive(Clone, Debug, Deserialize, Serialize, PartialEq, Eq)]
+pub struct Bandcamp(Url);
+
+impl Bandcamp {
+    pub fn new<S: AsRef<str>>(url: S) -> Result<Self, Error> {
+        let url = Url::parse(url.as_ref())?;
+
+        if !url
+            .domain()
+            .map(|u| u.ends_with("bandcamp.com"))
+            .unwrap_or(false)
+        {
+            return Err(Self::invalid_url_error(url).into());
+        }
+
+        Ok(Bandcamp(url))
+    }
+
+    fn invalid_url_error<S: Into<String>>(url: S) -> InvalidUrlError {
+        InvalidUrlError {
+            url_type: UrlType::Bandcamp,
+            url: url.into(),
+        }
+    }
+}
+
+impl IUrl for Bandcamp {
+    fn url(&self) -> &str {
+        self.0.as_str()
+    }
+}
+
+/// Qobuz reference.
+#[derive(Clone, Debug, Deserialize, Serialize, PartialEq, Eq)]
+pub struct Qobuz(Url);
+
+impl Qobuz {
+    pub fn new<S: AsRef<str>>(url: S) -> Result<Self, Error> {
+        let url = Url::parse(url.as_ref())?;
+
+        if !url
+            .domain()
+            .map(|u| u.ends_with("qobuz.com"))
+            .unwrap_or(false)
+        {
+            return Err(Self::invalid_url_error(url).into());
+        }
+
+        Ok(Qobuz(url))
+    }
+
+    fn invalid_url_error<S: Into<String>>(url: S) -> InvalidUrlError {
+        InvalidUrlError {
+            url_type: UrlType::Qobuz,
+            url: url.into(),
+        }
+    }
+}
+
+impl IUrl for Qobuz {
+    fn url(&self) -> &str {
+        self.0.as_str()
+    }
+}
 
 /// The track file format.
 #[derive(Clone, Copy, Debug, Deserialize, Serialize, PartialEq, Eq)]
@@ -107,10 +279,20 @@ pub struct ArtistId {
     pub name: String,
 }
 
+/// The artist properties.
+#[derive(Clone, Debug, Default, Deserialize, Serialize, PartialEq, Eq)]
+pub struct ArtistProperties {
+    pub musicbrainz: Option<MusicBrainz>,
+    pub musicbutler: Vec<MusicButler>,
+    pub bandcamp: Vec<Bandcamp>,
+    pub qobuz: Option<Qobuz>,
+}
+
 /// An artist.
 #[derive(Clone, Debug, Deserialize, Serialize, PartialEq, Eq)]
 pub struct Artist {
     pub id: ArtistId,
+    pub properties: ArtistProperties,
     pub albums: Vec<Album>,
 }
 
@@ -194,6 +376,10 @@ pub enum Error {
     LibraryError(String),
     /// The [`MusicHoard`] failed to read/write from/to the database.
     DatabaseError(String),
+    /// The [`MusicHoard`] failed to parse a user-provided URL.
+    UrlParseError(String),
+    /// The user-provided URL is not valid.
+    InvalidUrlError(String),
 }
 
 impl fmt::Display for Error {
@@ -203,6 +389,8 @@ impl fmt::Display for Error {
             Self::DatabaseError(ref s) => {
                 write!(f, "failed to read/write from/to the database: {s}")
             }
+            Self::UrlParseError(ref s) => write!(f, "failed to parse a user-provided URL: {s}"),
+            Self::InvalidUrlError(ref s) => write!(f, "user-provided URL is invalid: {s}"),
         }
     }
 }
@@ -225,6 +413,24 @@ impl From<database::SaveError> for Error {
     }
 }
 
+impl From<url::ParseError> for Error {
+    fn from(err: url::ParseError) -> Error {
+        Error::UrlParseError(err.to_string())
+    }
+}
+
+impl From<uuid::Error> for Error {
+    fn from(err: uuid::Error) -> Error {
+        Error::UrlParseError(err.to_string())
+    }
+}
+
+impl From<InvalidUrlError> for Error {
+    fn from(err: InvalidUrlError) -> Error {
+        Error::InvalidUrlError(err.to_string())
+    }
+}
+
 /// The Music Hoard. It is responsible for pulling information from both the library and the
 /// database, ensuring its consistent and writing back any changes.
 pub struct MusicHoard<LIB, DB> {
@@ -327,6 +533,7 @@ impl<LIB: ILibrary, DB: IDatabase> MusicHoard<LIB, DB> {
                 album_ids.insert(artist_id.clone(), HashSet::<AlbumId>::new());
                 artists.push(Artist {
                     id: artist_id.clone(),
+                    properties: ArtistProperties::default(),
                     albums: vec![],
                 });
                 artists.last_mut().unwrap()
@@ -403,6 +610,72 @@ mod tests {
         items
     }
 
+    fn clean_collection(mut collection: Collection) -> Collection {
+        for artist in collection.iter_mut() {
+            artist.properties = ArtistProperties::default();
+        }
+        collection
+    }
+
+    #[test]
+    fn musicbrainz() {
+        let uuid = "d368baa8-21ca-4759-9731-0b2753071ad8";
+        let url = format!("https://musicbrainz.org/artist/{uuid}");
+        let mb = MusicBrainz::new(&url).unwrap();
+        assert_eq!(url, mb.url());
+        assert_eq!(uuid, mb.mbid());
+
+        let url = format!("not a url at all");
+        let expected_error: Error = url::ParseError::RelativeUrlWithoutBase.into();
+        let actual_error = MusicBrainz::new(&url).unwrap_err();
+        assert_eq!(actual_error, expected_error);
+        assert_eq!(actual_error.to_string(), expected_error.to_string());
+
+        let url = format!("https://musicbrainz.org/artist/i-am-not-a-uuid");
+        let expected_error: Error = Uuid::try_parse("i-am-not-a-uuid").unwrap_err().into();
+        let actual_error = MusicBrainz::new(&url).unwrap_err();
+        assert_eq!(actual_error, expected_error);
+        assert_eq!(actual_error.to_string(), expected_error.to_string());
+
+        let url = format!("https://musicbrainz.org/artist");
+        let expected_error: Error = InvalidUrlError {
+            url_type: UrlType::MusicBrainz,
+            url: url.clone(),
+        }
+        .into();
+        let actual_error = MusicBrainz::new(&url).unwrap_err();
+        assert_eq!(actual_error, expected_error);
+        assert_eq!(actual_error.to_string(), expected_error.to_string());
+    }
+
+    #[test]
+    fn urls() {
+        let musicbrainz = "https://musicbrainz.org/artist/d368baa8-21ca-4759-9731-0b2753071ad8";
+        let musicbutler = "https://www.musicbutler.io/artist-page/483340948";
+        let bandcamp = "https://thelasthangmen.bandcamp.com/";
+        let qobuz = "https://www.qobuz.com/nl-nl/interpreter/the-last-hangmen/1244413";
+
+        assert!(MusicBrainz::new(&musicbrainz).is_ok());
+        assert!(MusicBrainz::new(&musicbutler).is_err());
+        assert!(MusicBrainz::new(&bandcamp).is_err());
+        assert!(MusicBrainz::new(&qobuz).is_err());
+
+        assert!(MusicButler::new(&musicbrainz).is_err());
+        assert!(MusicButler::new(&musicbutler).is_ok());
+        assert!(MusicButler::new(&bandcamp).is_err());
+        assert!(MusicButler::new(&qobuz).is_err());
+
+        assert!(Bandcamp::new(&musicbrainz).is_err());
+        assert!(Bandcamp::new(&musicbutler).is_err());
+        assert!(Bandcamp::new(&bandcamp).is_ok());
+        assert!(Bandcamp::new(&qobuz).is_err());
+
+        assert!(Qobuz::new(&musicbrainz).is_err());
+        assert!(Qobuz::new(&musicbutler).is_err());
+        assert!(Qobuz::new(&bandcamp).is_err());
+        assert!(Qobuz::new(&qobuz).is_ok());
+    }
+
     #[test]
     fn merge_track() {
         let left = Track {
@@ -536,7 +809,10 @@ mod tests {
         let mut music_hoard = MusicHoard::new(library, database);
 
         music_hoard.rescan_library().unwrap();
-        assert_eq!(music_hoard.get_collection(), &*COLLECTION);
+        assert_eq!(
+            music_hoard.get_collection(),
+            &clean_collection(COLLECTION.to_owned())
+        );
     }
 
     #[test]
@@ -560,7 +836,10 @@ mod tests {
         let mut music_hoard = MusicHoard::new(library, database);
 
         music_hoard.rescan_library().unwrap();
-        assert_eq!(music_hoard.get_collection(), &*COLLECTION);
+        assert_eq!(
+            music_hoard.get_collection(),
+            &clean_collection(COLLECTION.to_owned())
+        );
     }
 
     #[test]
@@ -568,7 +847,7 @@ mod tests {
         let mut library = MockILibrary::new();
         let database = MockIDatabase::new();
 
-        let mut expected = COLLECTION.to_owned();
+        let mut expected = clean_collection(COLLECTION.to_owned());
         expected[0].albums[0].id.year = expected[1].albums[0].id.year;
         expected[0].albums[0].id.title = expected[1].albums[0].id.title.clone();
 
@@ -614,7 +893,7 @@ mod tests {
         let library_input = Query::new();
         let library_result = Ok(artists_to_items(&COLLECTION));
 
-        let database_input = COLLECTION.to_owned();
+        let database_input = clean_collection(COLLECTION.to_owned());
         let database_result = Ok(());
 
         library
@@ -632,7 +911,10 @@ mod tests {
         let mut music_hoard = MusicHoard::new(library, database);
 
         music_hoard.rescan_library().unwrap();
-        assert_eq!(music_hoard.get_collection(), &*COLLECTION);
+        assert_eq!(
+            music_hoard.get_collection(),
+            &clean_collection(COLLECTION.to_owned())
+        );
         music_hoard.save_to_database().unwrap();
     }
 

src/testlib.rs

@@ -5,6 +5,20 @@ macro_rules! collection {
                 id: ArtistId {
                     name: "album_artist a".to_string(),
                 },
+                properties: ArtistProperties {
+                    musicbrainz: Some(MusicBrainz::new(
+                        "https://musicbrainz.org/artist/00000000-0000-0000-0000-000000000000",
+                    ).unwrap()),
+                    musicbutler: vec![
+                        MusicButler::new(
+                            "https://www.musicbutler.io/artist-page/000000000"
+                        ).unwrap(),
+                    ],
+                    bandcamp: vec![],
+                    qobuz: Some(Qobuz::new(
+                        "https://www.qobuz.com/nl-nl/interpreter/artist-a/download-streaming-albums",
+                    ).unwrap()),
+                },
                 albums: vec![
                     Album {
                         id: AlbumId {
@@ -86,6 +100,25 @@ macro_rules! collection {
                 id: ArtistId {
                     name: "album_artist b".to_string(),
                 },
+                properties: ArtistProperties {
+                    musicbrainz: Some(MusicBrainz::new(
+                        "https://musicbrainz.org/artist/11111111-1111-1111-1111-111111111111",
+                    ).unwrap()),
+                    musicbutler: vec![
+                        MusicButler::new(
+                            "https://www.musicbutler.io/artist-page/111111111"
+                        ).unwrap(),
+                        MusicButler::new(
+                            "https://www.musicbutler.io/artist-page/111111112"
+                        ).unwrap(),
+                    ],
+                    bandcamp: vec![
+                        Bandcamp::new("https://artist-b.bandcamp.com/").unwrap(),
+                    ],
+                    qobuz: Some(Qobuz::new(
+                        "https://www.qobuz.com/nl-nl/interpreter/artist-b/download-streaming-albums",
+                    ).unwrap()),
+                },
                 albums: vec![
                     Album {
                         id: AlbumId {
@@ -159,6 +192,14 @@ macro_rules! collection {
                 id: ArtistId {
                     name: "album_artist c".to_string(),
                 },
+                properties: ArtistProperties {
+                    musicbrainz: Some(MusicBrainz::new(
+                        "https://musicbrainz.org/artist/11111111-1111-1111-1111-111111111111",
+                    ).unwrap()),
+                    musicbutler: vec![],
+                    bandcamp: vec![],
+                    qobuz: None,
+                },
                 albums: vec![
                     Album {
                         id: AlbumId {

tests/lib.rs

@@ -1,15 +1,32 @@
 mod database;
 mod library;
 
-use musichoard::{Album, AlbumId, Artist, ArtistId, Format, Quality, Track, TrackId};
+use musichoard::{
+    Album, AlbumId, Artist, ArtistId, ArtistProperties, Bandcamp, Collection, Format, MusicBrainz,
+    MusicButler, Qobuz, Quality, Track, TrackId,
+};
 use once_cell::sync::Lazy;
 
-static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| {
+static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
     vec![
         Artist {
             id: ArtistId {
                 name: String::from("Аркона"),
             },
+            properties: ArtistProperties {
+                musicbrainz: Some(MusicBrainz::new(
+                    "https://musicbrainz.org/artist/baad262d-55ef-427a-83c7-f7530964f212",
+                ).unwrap()),
+                musicbutler: vec![
+                    MusicButler::new("https://www.musicbutler.io/artist-page/283448581").unwrap(),
+                ],
+                bandcamp: vec![
+                    Bandcamp::new("https://arkonamoscow.bandcamp.com/").unwrap(),
+                ],
+                qobuz: Some(Qobuz::new(
+                    "https://www.qobuz.com/nl-nl/interpreter/arkona/download-streaming-albums",
+                ).unwrap()),
+            },
             albums: vec![Album {
                 id: AlbumId {
                     year: 2011,
@@ -177,6 +194,18 @@ static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| {
             id: ArtistId {
                 name: String::from("Eluveitie"),
             },
+            properties: ArtistProperties {
+                musicbrainz: Some(MusicBrainz::new(
+                    "https://musicbrainz.org/artist/8000598a-5edb-401c-8e6d-36b167feaf38",
+                ).unwrap()),
+                musicbutler: vec![
+                    MusicButler::new("https://www.musicbutler.io/artist-page/269358403").unwrap(),
+                ],
+                bandcamp: vec![],
+                qobuz: Some(Qobuz::new(
+                    "https://www.qobuz.com/nl-nl/interpreter/eluveitie/download-streaming-albums",
+                ).unwrap()),
+            },
             albums: vec![
                 Album {
                     id: AlbumId {
@@ -398,6 +427,18 @@ static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| {
             id: ArtistId {
                 name: String::from("Frontside"),
             },
+            properties: ArtistProperties {
+                musicbrainz: Some(MusicBrainz::new(
+                    "https://musicbrainz.org/artist/3a901353-fccd-4afd-ad01-9c03f451b490",
+                ).unwrap()),
+                musicbutler: vec![
+                    MusicButler::new("https://www.musicbutler.io/artist-page/826588800").unwrap(),
+                ],
+                bandcamp: vec![],
+                qobuz: Some(Qobuz::new(
+                    "https://www.qobuz.com/nl-nl/interpreter/frontside/download-streaming-albums",
+                ).unwrap()),
+            },
             albums: vec![Album {
                 id: AlbumId {
                     year: 2001,
@@ -532,6 +573,18 @@ static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| {
             id: ArtistId {
                 name: String::from("Heaven’s Basement"),
             },
+            properties: ArtistProperties {
+                musicbrainz: Some(MusicBrainz::new(
+                    "https://musicbrainz.org/artist/c2c4d56a-d599-4a18-bd2f-ae644e2198cc",
+                ).unwrap()),
+                musicbutler: vec![
+                    MusicButler::new("https://www.musicbutler.io/artist-page/291158685").unwrap(),
+                ],
+                bandcamp: vec![],
+                qobuz: Some(Qobuz::new(
+                    "https://www.qobuz.com/nl-nl/interpreter/heaven-s-basement/download-streaming-albums",
+                ).unwrap()),
+            },
             albums: vec![Album {
                 id: AlbumId {
                     year: 2011,
@@ -622,6 +675,18 @@ static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| {
             id: ArtistId {
                 name: String::from("Metallica"),
             },
+            properties: ArtistProperties {
+                musicbrainz: Some(MusicBrainz::new(
+                    "https://musicbrainz.org/artist/65f4f0c5-ef9e-490c-aee3-909e7ae6b2ab",
+                ).unwrap()),
+                musicbutler: vec![
+                    MusicButler::new("https://www.musicbutler.io/artist-page/3996865").unwrap(),
+                ],
+                bandcamp: vec![],
+                qobuz: Some(Qobuz::new(
+                    "https://www.qobuz.com/nl-nl/interpreter/metallica/download-streaming-albums",
+                ).unwrap()),
+            },
             albums: vec![
                 Album {
                     id: AlbumId {