Refactor/soundcloud client

cmd/base.go

@@ -7,7 +7,9 @@ import (
 func scdl(args []string) {
 	url := args[0]
 
-	// download song
-	soundcloud.Download(url)
+	// Create a new SoundCloud client
+	sc := soundcloud.NewClient("", nil)
+	// Download the song
+	sc.Download(url)
 
 }

cmd/root.go

@@ -39,7 +39,8 @@ func Execute() {
 	// Persistent Flags
 	// TODO: implement search functionality
 	//rootCmd.PersistentFlags().BoolVarP(&Find, "search", "s", false, "Option for searching for songs")
-
+	// TODO: implement private downloads
+	//rootCmd.PersistentFlags().BoolVarP(&Private, "private", "p", false, "Option for downloading private songs")
 	// Execute the command :)
 	if err := rootCmd.Execute(); err != nil {
 		os.Exit(1)

pkg/soundcloud/artwork.go

@@ -0,0 +1,3 @@
+package soundcloud
+
+type ArtworkService service

pkg/soundcloud/download.go

@@ -11,19 +11,17 @@ import (
 )
 
 // Download queries the SoundCloud api and receives a m3u8 file, then binds the segments received into a .mp3 file
-func Download(url string) {
-	// TODO: This client should be created higher up in the stack
-	soundcloud := NewClient()
+func (s *Soundcloud) Download(url string) {
 
 	req, err := http.NewRequest("GET", url, nil)
 	if err != nil {
 		log.Println(err)
 	}
 
 	// set Non Hacker User Agent
-	req.Header.Set("Accept", soundcloud.userAgent)
+	req.Header.Set("Accept", s.UserAgent)
 
-	resp, err := soundcloud.Client.Do(req)
+	resp, err := s.Client.Do(req)
 	if err != nil {
 		log.Println(err)
 	}
@@ -34,17 +32,17 @@ func Download(url string) {
 		log.Println(err)
 	}
 
-	streamURL, err := soundcloud.ConstructStreamURL(doc)
+	streamURL, err := s.ConstructStreamURL(doc)
 	if err != nil {
 		log.Println(err)
 	}
 
-	songName, err := soundcloud.GetTitle(doc)
+	songName, err := s.GetTitle(doc)
 	if err != nil {
 		log.Println(err)
 	}
 
-	artwork, err := soundcloud.GetArtwork(doc)
+	artwork, err := s.GetArtwork(doc)
 	if err != nil {
 		log.Println(err)
 	}

pkg/soundcloud/get_client_id.go

@@ -39,6 +39,6 @@ func (s *Soundcloud) GetClientID() (string, error) {
 		log.Println("client_id not found")
 		return "", fmt.Errorf("client_id not found")
 	}
-
+	
 	return clientID, nil
 }

pkg/soundcloud/soundcloud.go

@@ -2,18 +2,51 @@ package soundcloud
 
 import "net/http"
 
+const (
+	userAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3"
+	version   = "2.3.8"
+)
+
 // Soundcloud struct represents a http client to make requests to SoundCloud's API
 type Soundcloud struct {
-	Client *http.Client // http client
+	// Client is the http client used to make requests
+	Client *http.Client
+
+	// UserAgent is the User-Agent header used for requests
+	UserAgent string
+	// AuthToken is the token used for authenticated requests
+	AuthToken string
+
+	// reuse a single struct instead of allocating one for each service on the heap.
+	common service
+
+	// Services used for talking to different parts of the Soundcloud
+
+	// Tracks is used for talking to the tracks endpoints
+	Tracks *TracksService
+	// Artwork is used for talking to the artwork endpoints
+	Artwork *ArtworkService
+	// User is used for talking to the user endpoints
+	// User *UsersService
+}
 
-	userAgent string // User-Agent header
+type service struct {
+	client *Soundcloud
 }
 
 // NewClient returns a new Soundcloud client
-func NewClient() *Soundcloud {
+func NewClient(authToken string, httpClient *http.Client) *Soundcloud {
+	if httpClient == nil {
+		httpClient = &http.Client{}
+	}
+
+	// TODO: Add a version header
+
+	// TODO: consume authToken for authenticated requests
+
 	return &Soundcloud{
 		Client: &http.Client{},
 
-		userAgent: "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3",
+		UserAgent: userAgent,
 	}
 }

pkg/soundcloud/tracks.go

@@ -0,0 +1,3 @@
+package soundcloud
+
+type TracksService service