temp fix 403 issue: kkdai#354

client.go

@@ -12,7 +12,9 @@ import (
 	"net/http"
 	"net/url"
 	"strconv"
+	"strings"
 	"sync/atomic"
+	"time"
 )
 
 const (
@@ -23,6 +25,8 @@ const (
 	playerParams = "CgIQBg=="
 )
 
+const CONTENT_PLAYBACK_NONCE_ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"
+
 var ErrNoFormat = errors.New("no video format provided")
 
 // DefaultClient type to use. No reason to change but you could if you wanted to.
@@ -157,6 +161,7 @@ type innertubeClient struct {
 	TimeZone          string `json:"timeZone"`
 	UTCOffset         int    `json:"utcOffsetMinutes"`
 	DeviceModel       string `json:"deviceModel,omitempty"`
+	VisitorData       string `json:"visitorData,omitempty"`
 }
 
 // client info for the innertube API
@@ -232,6 +237,33 @@ func (c *Client) transcriptDataByInnertube(ctx context.Context, id string, lang
 	return c.httpPostBodyBytes(ctx, "https://www.youtube.com/youtubei/v1/get_transcript?key="+c.client.key, data)
 }
 
+func randString(alphabet string, sz int) string {
+	var buf strings.Builder
+	buf.Grow(sz)
+	for i := 0; i < sz; i++ {
+		buf.WriteByte(alphabet[rand.Intn(len(alphabet))])
+	}
+	return buf.String()
+}
+
+func randomVisitorData(countryCode string) string {
+	var pbE2 ProtoBuilder
+
+	pbE2.String(2, "")
+	pbE2.Varint(4, int64(rand.Intn(255)+1))
+
+	var pbE ProtoBuilder
+	pbE.String(1, countryCode)
+	pbE.Bytes(2, pbE2.ToBytes())
+
+	var pb ProtoBuilder
+	pb.String(1, randString(CONTENT_PLAYBACK_NONCE_ALPHABET, 11))
+	pb.Varint(5, time.Now().Unix()-int64(rand.Intn(600000)))
+	pb.Bytes(6, pbE.ToBytes())
+
+	return pb.ToUrlEncodedBase64()
+}
+
 func prepareInnertubeContext(clientInfo clientInfo) inntertubeContext {
 	return inntertubeContext{
 		Client: innertubeClient{
@@ -243,6 +275,7 @@ func prepareInnertubeContext(clientInfo clientInfo) inntertubeContext {
 			ClientVersion:     clientInfo.version,
 			AndroidSDKVersion: clientInfo.androidVersion,
 			UserAgent:         clientInfo.userAgent,
+			VisitorData:       randomVisitorData("US"),
 		},
 	}
 }

protobuilder.go

@@ -0,0 +1,73 @@
+package youtube
+
+import (
+	"bytes"
+	"encoding/base64"
+	"net/url"
+)
+
+type ProtoBuilder struct {
+	byteBuffer bytes.Buffer
+}
+
+func (pb *ProtoBuilder) ToBytes() []byte {
+	return pb.byteBuffer.Bytes()
+}
+
+func (pb *ProtoBuilder) ToUrlEncodedBase64() string {
+	b64 := base64.URLEncoding.EncodeToString(pb.ToBytes())
+	return url.QueryEscape(b64)
+}
+
+func (pb *ProtoBuilder) writeVarint(val int64) error {
+	if val == 0 {
+		_, err := pb.byteBuffer.Write([]byte{0})
+		return err
+	}
+	for {
+		b := byte(val & 0x7F)
+		val >>= 7
+		if val != 0 {
+			b |= 0x80
+		}
+		_, err := pb.byteBuffer.Write([]byte{b})
+		if err != nil {
+			return err
+		}
+		if val == 0 {
+			break
+		}
+	}
+	return nil
+}
+
+func (pb *ProtoBuilder) field(field int, wireType byte) error {
+	val := int64(field<<3) | int64(wireType&0x07)
+	return pb.writeVarint(val)
+}
+
+func (pb *ProtoBuilder) Varint(field int, val int64) error {
+	err := pb.field(field, 0)
+	if err != nil {
+		return err
+	}
+	return pb.writeVarint(val)
+}
+
+func (pb *ProtoBuilder) String(field int, stringVal string) error {
+	strBts := []byte(stringVal)
+	return pb.Bytes(field, strBts)
+}
+
+func (pb *ProtoBuilder) Bytes(field int, bytesVal []byte) error {
+	if err := pb.field(field, 2); err != nil {
+		return err
+	}
+
+	if err := pb.writeVarint(int64(len(bytesVal))); err != nil {
+		return err
+	}
+
+	_, err := pb.byteBuffer.Write(bytesVal)
+	return err
+}