feat(player): Add DownloadPlayer

player.go

@@ -6,12 +6,42 @@ import (
 	"io"
 	"io/ioutil"
 	"net/http"
+	"os"
 )
 
 const (
 	playerURL = "http://radiko.jp/apps/js/flash/myplayer-release.swf"
+
+	// swfextract
+	targetID     = 12 // swfextract -b "12"
+	targetCode   = 87 // swfextract "-b" 12
+	headerCWS    = 8
+	headerRect   = 5
+	rectNum      = 4
+	headerRest   = 2 + 2
+	binaryOffset = 6
 )
 
+// DownloadPlayer downloads a swf player file.
+func DownloadPlayer(path string) error {
+	f, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+
+	resp, err := http.Get(playerURL)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	_, err = io.Copy(f, resp.Body)
+	if closeErr := f.Close(); err == nil {
+		err = closeErr
+	}
+	return err
+}
+
 func downloadBinary() ([]byte, error) {
 	resp, err := http.Get(playerURL)
 	if err != nil {
@@ -22,15 +52,6 @@ func downloadBinary() ([]byte, error) {
 	return swfExtract(resp.Body)
 }
 
-const targetID = 12   // swfextract -b "12"
-const targetCode = 87 // swfextract "-b" 12
-
-const headerCWS = 8
-const headerRect = 5
-const rectNum = 4
-const headerRest = 2 + 2
-const binaryOffset = 6
-
 func swfExtract(body io.Reader) ([]byte, error) {
 	io.CopyN(ioutil.Discard, body, headerCWS)
 	zf, err := zlib.NewReader(body)

player_test.go

@@ -1,6 +1,20 @@
 package radiko
 
-import "testing"
+import (
+	"path"
+	"testing"
+)
+
+func TestDownloadPlayer(t *testing.T) {
+	dir, removeDir := createTestTempDir(t)
+	defer removeDir() // clean up
+
+	playerPath := path.Join(dir, "myplayer.swf")
+	err := DownloadPlayer(playerPath)
+	if err != nil {
+		t.Errorf("Failed to download player.swf: %s", err)
+	}
+}
 
 func TestDownloadBinary(t *testing.T) {
 	_, err := downloadBinary()