69 lines
1.6 KiB
Go
69 lines
1.6 KiB
Go
package deezer
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import "fmt"
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// Kind is the type of Deezer resource being downloaded. It is the single
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// source of truth for the four supported resources: the cmd package derives
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// its download subcommands from these constants, and each kind maps to a
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// gw-light page method, the request field naming its id, and a Resource
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// implementation. Adding a kind means extending all three switches below.
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type Kind string
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const (
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KindAlbum Kind = "album"
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KindPlaylist Kind = "playlist"
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KindArtist Kind = "artist"
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KindTrack Kind = "track"
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)
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func (k Kind) pageMethod() string {
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switch k {
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case KindAlbum:
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return "Album"
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case KindPlaylist:
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return "Playlist"
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case KindArtist:
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return "Artist"
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case KindTrack:
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return "Track"
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}
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return ""
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}
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// idKey returns the request field that carries the resource id. The names are
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// Deezer's own internal abbreviations and do not follow from the kind, so they
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// have to be spelled out. A track is a "song" on the wire.
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func (k Kind) idKey() string {
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switch k {
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case KindAlbum:
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return "alb_id"
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case KindPlaylist:
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return "playlist_id"
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case KindArtist:
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return "art_id"
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case KindTrack:
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return "sng_id"
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}
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return ""
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}
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// newResource returns an empty Resource for the kind. KindTrack maps to
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// Single because a single track page has its own response shape rather than
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// being an album with one entry.
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func (k Kind) newResource() (Resource, error) {
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switch k {
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case KindAlbum:
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return &Album{}, nil
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case KindPlaylist:
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return &Playlist{}, nil
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case KindArtist:
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return &Artist{}, nil
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case KindTrack:
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return &Single{}, nil
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}
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return nil, fmt.Errorf("unsupported resource type: %s", k)
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}
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