feat(subsonic): add internet radio support

* Initial commit of internet radio support.

* Added first test for internet radio.

* Refactor to prepare for more test cases.

* Added a few more tests. Realized that I was not calling as admin so added ability to mock admin.

* Added more internet radio tests. Added proper JSON unmarshaling for ID.

* More test cases. Fixed some accidental tabs in files.

* Fixed some more tabs.

* lint fixes

* Changed placeholder for homepage URL to fit into box.

* Finished out internet radio test cases. Found a few bad error codes in internet radio AND podcasts (mea culpa).

* Realized that delete via website was not checking properly if id existed. Fixed.

gofmt

server/ctrlsubsonic/specid/ids.go

@@ -15,17 +15,19 @@ var (
 	ErrBadSeparator = errors.New("bad separator")
 	ErrNotAnInt     = errors.New("not an int")
 	ErrBadPrefix    = errors.New("bad prefix")
+	ErrBadJSON      = errors.New("bad JSON")
 )
 
 type IDT string
 
 const (
-	Artist         IDT = "ar"
-	Album          IDT = "al"
-	Track          IDT = "tr"
-	Podcast        IDT = "pd"
-	PodcastEpisode IDT = "pe"
-	separator          = "-"
+	Artist               IDT = "ar"
+	Album                IDT = "al"
+	Track                IDT = "tr"
+	Podcast              IDT = "pd"
+	PodcastEpisode       IDT = "pe"
+	InternetRadioStation IDT = "ir"
+	separator                = "-"
 )
 
 type ID struct {
@@ -55,6 +57,8 @@ func New(in string) (ID, error) {
 		return ID{Type: Podcast, Value: val}, nil
 	case PodcastEpisode:
 		return ID{Type: PodcastEpisode, Value: val}, nil
+	case InternetRadioStation:
+		return ID{Type: InternetRadioStation, Value: val}, nil
 	default:
 		return ID{}, fmt.Errorf("%q: %w", partType, ErrBadPrefix)
 	}
@@ -71,6 +75,17 @@ func (i ID) MarshalJSON() ([]byte, error) {
 	return json.Marshal(i.String())
 }
 
+func (i *ID) UnmarshalJSON(data []byte) (error) {
+	if (len(data) <= 2) {
+		return fmt.Errorf("too short: %w", ErrBadJSON)
+	}
+	id, err := New(string(data[1:len(data)-1])) // Strip quotes
+	if (err == nil) {
+		*i = id;
+	}
+	return err;
+}
+
 func (i ID) MarshalText() ([]byte, error) {
 	return []byte(i.String()), nil
 }