feel like this is a pretty decent solution for getting the client ID

pkg/soundcloud/get_client_id.go

@@ -1,18 +1,44 @@
 package soundcloud
 
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"regexp"
+)
+
 // Unfortunately, SoundCloud does not inject the client ID into the page source unless the request is made from a browser. ( Javascript is enabled )
 // This is a workaround to get the client ID from the JS file that is injected into the page source.
 
 // GetClientID returns a new generated client_id when a request is made to SoundCloud's API
 func (s *Soundcloud) GetClientID() (string, error) {
+	var clientID string
 
 	// this is the JS file that is injected into the page source
 	// this can always change at some point, so we have to keep an eye on it
-	_, err := s.Client.Get("https://a-v2.sndcdn.com/assets/2-1475fa5a.js")
+	resp, err := s.Client.Get("https://a-v2.sndcdn.com/assets/2-fbfac8ab.js")
 	if err != nil {
 		return "", err
 	}
 
-	// return hardcoded client ID for now
-	return "vbQio6WOh4nNUyVjDdlg5sqdAigTAEzF", nil
+	defer resp.Body.Close()
+
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		log.Fatalf("failed to read response body: %v", err)
+	}
+
+	// regex to find the client_id
+	re := regexp.MustCompile(`client_id\s*:\s*['"]([^'"]+)['"]`)
+	matches := re.FindSubmatch(body)
+
+	if len(matches) > 1 {
+		// Found a client_id
+		clientID = string(matches[1])
+	} else {
+		log.Println("client_id not found")
+		return "", fmt.Errorf("client_id not found")
+	}
+
+	return clientID, nil
 }

pkg/soundcloud/service.go

@@ -0,0 +1,7 @@
+package soundcloud
+
+// Service is the interface that wraps the basic methods to interact with SoundCloud's API
+type Service interface {
+	GetClientID() (string, error)
+	Download(url string) error
+}