algo/common/common.go

@@ -1,17 +1,12 @@
 package common
 
-import (
-	"context"
-	"io"
-)
-
 type Decoder interface {
 	Validate() error
-	io.Reader
+	Decode() error
-}
+	GetCoverImage() []byte
-
+	GetAudioData() []byte
-type CoverImageGetter interface {
+	GetAudioExt() string
-	GetCoverImage(ctx context.Context) ([]byte, error)
+	GetMeta() Meta
 }
 
 type Meta interface {
@@ -19,7 +14,3 @@ type Meta interface {
 	GetTitle() string
 	GetAlbum() string
 }
-
-type StreamDecoder interface {
-	Decrypt(buf []byte, offset int)
-}

algo/common/dispatch.go

@@ -1,12 +1,11 @@
 package common
 
 import (
-	"io"
 	"path/filepath"
 	"strings"
 )
 
-type NewDecoderFunc func(rd io.ReadSeeker) Decoder
+type NewDecoderFunc func([]byte) Decoder
 
 type decoderItem struct {
 	noop    bool

algo/common/raw.go

@@ -2,39 +2,46 @@ package common
 
 import (
 	"errors"
-	"fmt"
+	"strings"
-	"io"
 )
 
 type RawDecoder struct {
-	rd io.ReadSeeker
+	file     []byte
-
 	audioExt string
 }
 
-func NewRawDecoder(rd io.ReadSeeker) Decoder {
+func NewRawDecoder(file []byte) Decoder {
-	return &RawDecoder{rd: rd}
+	return &RawDecoder{file: file}
 }
 
 func (d *RawDecoder) Validate() error {
-	header := make([]byte, 16)
+	for ext, sniffer := range snifferRegistry {
-	if _, err := io.ReadFull(d.rd, header); err != nil {
+		if sniffer(d.file) {
-		return fmt.Errorf("read file header failed: %v", err)
+			d.audioExt = strings.ToLower(ext)
-	}
+			return nil
-	if _, err := d.rd.Seek(0, io.SeekStart); err != nil {
+		}
-		return fmt.Errorf("seek file failed: %v", err)
 	}
+	return errors.New("audio doesn't recognized")
+}
 
-	var ok bool
+func (d RawDecoder) Decode() error {
-	d.audioExt, ok = SniffAll(header)
-	if !ok {
-		return errors.New("raw: sniff audio type failed")
-	}
 	return nil
 }
 
-func (d *RawDecoder) Read(p []byte) (n int, err error) {
+func (d RawDecoder) GetCoverImage() []byte {
-	return d.rd.Read(p)
+	return nil
+}
+
+func (d RawDecoder) GetAudioData() []byte {
+	return d.file
+}
+
+func (d RawDecoder) GetAudioExt() string {
+	return d.audioExt
+}
+
+func (d RawDecoder) GetMeta() Meta {
+	return nil
 }
 
 func init() {

algo/kgm/kgm.go

@@ -1,57 +1,90 @@
 package kgm
 
 import (
-	"fmt"
+	"bytes"
-	"io"
+	"encoding/binary"
+	"errors"
+	"github.com/unlock-music/cli/algo/common"
+	"github.com/unlock-music/cli/internal/logging"
+)
 
-	"unlock-music.dev/cli/algo/common"
+var (
+	vprHeader = []byte{
+		0x05, 0x28, 0xBC, 0x96, 0xE9, 0xE4, 0x5A, 0x43,
+		0x91, 0xAA, 0xBD, 0xD0, 0x7A, 0xF5, 0x36, 0x31}
+	kgmHeader = []byte{
+		0x7C, 0xD5, 0x32, 0xEB, 0x86, 0x02, 0x7F, 0x4B,
+		0xA8, 0xAF, 0xA6, 0x8E, 0x0F, 0xFF, 0x99, 0x14}
+	ErrKgmMagicHeader = errors.New("kgm/vpr magic header not matched")
 )
 
 type Decoder struct {
-	header header
+	file  []byte
-	cipher common.StreamDecoder
+	key   []byte
-
+	isVpr bool
-	rd     io.ReadSeeker
+	audio []byte
-	offset int
 }
 
-func NewDecoder(rd io.ReadSeeker) common.Decoder {
+func NewDecoder(file []byte) common.Decoder {
-	return &Decoder{rd: rd}
+	return &Decoder{
+		file: file,
+	}
 }
 
-func (d *Decoder) Validate() (err error) {
+func (d Decoder) GetCoverImage() []byte {
-	if err := d.header.FromFile(d.rd); err != nil {
-		return err
-	}
-	// TODO; validate crypto version
-
-	switch d.header.CryptoVersion {
-	case 3:
-		d.cipher, err = newKgmCryptoV3(&d.header)
-		if err != nil {
-			return fmt.Errorf("kgm init crypto v3: %w", err)
-		}
-	default:
-		return fmt.Errorf("kgm: unsupported crypto version %d", d.header.CryptoVersion)
-	}
-
-	// prepare for read
-	if _, err := d.rd.Seek(int64(d.header.AudioOffset), io.SeekStart); err != nil {
-		return fmt.Errorf("kgm seek to audio: %w", err)
-	}
-
 	return nil
 }
 
-func (d *Decoder) Read(buf []byte) (int, error) {
+func (d Decoder) GetAudioData() []byte {
-	n, err := d.rd.Read(buf)
+	return d.audio
-	if n > 0 {
-		d.cipher.Decrypt(buf[:n], d.offset)
-		d.offset += n
-	}
-	return n, err
 }
 
+func (d Decoder) GetAudioExt() string {
+	return "" // use sniffer
+}
+
+func (d Decoder) GetMeta() common.Meta {
+	return nil
+}
+
+func (d *Decoder) Validate() error {
+	if bytes.Equal(kgmHeader, d.file[:len(kgmHeader)]) {
+		d.isVpr = false
+	} else if bytes.Equal(vprHeader, d.file[:len(vprHeader)]) {
+		d.isVpr = true
+	} else {
+		return ErrKgmMagicHeader
+	}
+
+	d.key = d.file[0x1c:0x2c]
+	d.key = append(d.key, 0x00)
+	_ = d.file[0x2c:0x3c] //todo: key2
+	return nil
+}
+
+func (d *Decoder) Decode() error {
+	headerLen := binary.LittleEndian.Uint32(d.file[0x10:0x14])
+	dataEncrypted := d.file[headerLen:]
+	lenData := len(dataEncrypted)
+	initMask()
+	if fullMaskLen < lenData {
+		logging.Log().Warn("The file is too large and the processed audio is incomplete, " +
+			"please report to us about this file at https://github.com/unlock-music/cli/issues")
+		lenData = fullMaskLen
+	}
+	d.audio = make([]byte, lenData)
+
+	for i := 0; i < lenData; i++ {
+		med8 := dataEncrypted[i] ^ d.key[i%17] ^ maskV2PreDef[i%(16*17)] ^ maskV2[i>>4]
+		d.audio[i] = med8 ^ (med8&0xf)<<4
+	}
+	if d.isVpr {
+		for i := 0; i < lenData; i++ {
+			d.audio[i] ^= maskDiffVpr[i%17]
+		}
+	}
+	return nil
+}
 func init() {
 	// Kugou
 	common.RegisterDecoder("kgm", false, NewDecoder)

algo/kgm/kgm_header.go

@@ -1,64 +0,0 @@
-package kgm
-
-import (
-	"bytes"
-	"encoding/binary"
-	"errors"
-	"fmt"
-	"io"
-)
-
-var (
-	vprHeader = []byte{
-		0x05, 0x28, 0xBC, 0x96, 0xE9, 0xE4, 0x5A, 0x43,
-		0x91, 0xAA, 0xBD, 0xD0, 0x7A, 0xF5, 0x36, 0x31,
-	}
-	kgmHeader = []byte{
-		0x7C, 0xD5, 0x32, 0xEB, 0x86, 0x02, 0x7F, 0x4B,
-		0xA8, 0xAF, 0xA6, 0x8E, 0x0F, 0xFF, 0x99, 0x14,
-	}
-
-	ErrKgmMagicHeader = errors.New("kgm magic header not matched")
-)
-
-// header is the header of a KGM file.
-type header struct {
-	MagicHeader    []byte // 0x00-0x0f: magic header
-	AudioOffset    uint32 // 0x10-0x13: offset of audio data
-	CryptoVersion  uint32 // 0x14-0x17: crypto version
-	CryptoSlot     uint32 // 0x18-0x1b: crypto key slot
-	CryptoTestData []byte // 0x1c-0x2b: crypto test data
-	CryptoKey      []byte // 0x2c-0x3b: crypto key
-}
-
-func (h *header) FromFile(rd io.ReadSeeker) error {
-	if _, err := rd.Seek(0, io.SeekStart); err != nil {
-		return fmt.Errorf("kgm seek start: %w", err)
-	}
-
-	buf := make([]byte, 0x3c)
-	if _, err := io.ReadFull(rd, buf); err != nil {
-		return fmt.Errorf("kgm read header: %w", err)
-	}
-
-	return h.FromBytes(buf)
-}
-
-func (h *header) FromBytes(buf []byte) error {
-	if len(buf) < 0x3c {
-		return errors.New("invalid kgm header length")
-	}
-
-	h.MagicHeader = buf[:0x10]
-	if !bytes.Equal(kgmHeader, h.MagicHeader) && !bytes.Equal(vprHeader, h.MagicHeader) {
-		return ErrKgmMagicHeader
-	}
-
-	h.AudioOffset = binary.LittleEndian.Uint32(buf[0x10:0x14])
-	h.CryptoVersion = binary.LittleEndian.Uint32(buf[0x14:0x18])
-	h.CryptoSlot = binary.LittleEndian.Uint32(buf[0x18:0x1c])
-	h.CryptoTestData = buf[0x1c:0x2c]
-	h.CryptoKey = buf[0x2c:0x3c]
-
-	return nil
-}

algo/kgm/kgm_v3.go

@@ -1,55 +0,0 @@
-package kgm
-
-import (
-	"crypto/md5"
-	"fmt"
-
-	"unlock-music.dev/cli/algo/common"
-)
-
-// kgmCryptoV3 is kgm file crypto v3
-type kgmCryptoV3 struct {
-	slotBox []byte
-	fileBox []byte
-}
-
-var kgmV3Slot2Key = map[uint32][]byte{
-	1: {0x6C, 0x2C, 0x2F, 0x27},
-}
-
-func newKgmCryptoV3(header *header) (common.StreamDecoder, error) {
-	c := &kgmCryptoV3{}
-
-	slotKey, ok := kgmV3Slot2Key[header.CryptoSlot]
-	if !ok {
-		return nil, fmt.Errorf("kgm3: unknown crypto slot %d", header.CryptoSlot)
-	}
-	c.slotBox = kugouMD5(slotKey)
-
-	c.fileBox = append(kugouMD5(header.CryptoKey), 0x6b)
-
-	return c, nil
-}
-
-func (d *kgmCryptoV3) Decrypt(b []byte, offset int) {
-	for i := 0; i < len(b); i++ {
-		b[i] ^= d.fileBox[(offset+i)%len(d.fileBox)]
-		b[i] ^= b[i] << 4
-		b[i] ^= d.slotBox[(offset+i)%len(d.slotBox)]
-		b[i] ^= xorCollapseUint32(uint32(offset + i))
-	}
-}
-
-func xorCollapseUint32(i uint32) byte {
-	return byte(i) ^ byte(i>>8) ^ byte(i>>16) ^ byte(i>>24)
-}
-
-func kugouMD5(b []byte) []byte {
-	digest := md5.Sum(b)
-	ret := make([]byte, 16)
-	for i := 0; i < md5.Size; i += 2 {
-		ret[i] = digest[14-i]
-		ret[i+1] = digest[14-i+1]
-	}
-	return ret
-}

algo/kgm/mask.go

@@ -0,0 +1,59 @@
+package kgm
+
+import (
+	"bytes"
+	_ "embed"
+	"github.com/ulikunitz/xz"
+	"github.com/unlock-music/cli/internal/logging"
+	"go.uber.org/zap"
+	"io"
+)
+
+var maskDiffVpr = []byte{
+	0x25, 0xDF, 0xE8, 0xA6, 0x75, 0x1E, 0x75, 0x0E,
+	0x2F, 0x80, 0xF3, 0x2D, 0xB8, 0xB6, 0xE3, 0x11,
+	0x00}
+
+var maskV2PreDef = []byte{
+	0xB8, 0xD5, 0x3D, 0xB2, 0xE9, 0xAF, 0x78, 0x8C, 0x83, 0x33, 0x71, 0x51, 0x76, 0xA0, 0xCD, 0x37,
+	0x2F, 0x3E, 0x35, 0x8D, 0xA9, 0xBE, 0x98, 0xB7, 0xE7, 0x8C, 0x22, 0xCE, 0x5A, 0x61, 0xDF, 0x68,
+	0x69, 0x89, 0xFE, 0xA5, 0xB6, 0xDE, 0xA9, 0x77, 0xFC, 0xC8, 0xBD, 0xBD, 0xE5, 0x6D, 0x3E, 0x5A,
+	0x36, 0xEF, 0x69, 0x4E, 0xBE, 0xE1, 0xE9, 0x66, 0x1C, 0xF3, 0xD9, 0x02, 0xB6, 0xF2, 0x12, 0x9B,
+	0x44, 0xD0, 0x6F, 0xB9, 0x35, 0x89, 0xB6, 0x46, 0x6D, 0x73, 0x82, 0x06, 0x69, 0xC1, 0xED, 0xD7,
+	0x85, 0xC2, 0x30, 0xDF, 0xA2, 0x62, 0xBE, 0x79, 0x2D, 0x62, 0x62, 0x3D, 0x0D, 0x7E, 0xBE, 0x48,
+	0x89, 0x23, 0x02, 0xA0, 0xE4, 0xD5, 0x75, 0x51, 0x32, 0x02, 0x53, 0xFD, 0x16, 0x3A, 0x21, 0x3B,
+	0x16, 0x0F, 0xC3, 0xB2, 0xBB, 0xB3, 0xE2, 0xBA, 0x3A, 0x3D, 0x13, 0xEC, 0xF6, 0x01, 0x45, 0x84,
+	0xA5, 0x70, 0x0F, 0x93, 0x49, 0x0C, 0x64, 0xCD, 0x31, 0xD5, 0xCC, 0x4C, 0x07, 0x01, 0x9E, 0x00,
+	0x1A, 0x23, 0x90, 0xBF, 0x88, 0x1E, 0x3B, 0xAB, 0xA6, 0x3E, 0xC4, 0x73, 0x47, 0x10, 0x7E, 0x3B,
+	0x5E, 0xBC, 0xE3, 0x00, 0x84, 0xFF, 0x09, 0xD4, 0xE0, 0x89, 0x0F, 0x5B, 0x58, 0x70, 0x4F, 0xFB,
+	0x65, 0xD8, 0x5C, 0x53, 0x1B, 0xD3, 0xC8, 0xC6, 0xBF, 0xEF, 0x98, 0xB0, 0x50, 0x4F, 0x0F, 0xEA,
+	0xE5, 0x83, 0x58, 0x8C, 0x28, 0x2C, 0x84, 0x67, 0xCD, 0xD0, 0x9E, 0x47, 0xDB, 0x27, 0x50, 0xCA,
+	0xF4, 0x63, 0x63, 0xE8, 0x97, 0x7F, 0x1B, 0x4B, 0x0C, 0xC2, 0xC1, 0x21, 0x4C, 0xCC, 0x58, 0xF5,
+	0x94, 0x52, 0xA3, 0xF3, 0xD3, 0xE0, 0x68, 0xF4, 0x00, 0x23, 0xF3, 0x5E, 0x0A, 0x7B, 0x93, 0xDD,
+	0xAB, 0x12, 0xB2, 0x13, 0xE8, 0x84, 0xD7, 0xA7, 0x9F, 0x0F, 0x32, 0x4C, 0x55, 0x1D, 0x04, 0x36,
+	0x52, 0xDC, 0x03, 0xF3, 0xF9, 0x4E, 0x42, 0xE9, 0x3D, 0x61, 0xEF, 0x7C, 0xB6, 0xB3, 0x93, 0x50,
+}
+
+//go:embed kgm.v2.mask
+var maskV2Xz []byte
+
+var maskV2 []byte
+var fullMaskLen int
+var initMaskOK = false
+
+//todo: decompress mask on demand
+func initMask() {
+	if initMaskOK {
+		return
+	}
+	maskReader, err := xz.NewReader(bytes.NewReader(maskV2Xz))
+	if err != nil {
+		logging.Log().Fatal("load kgm mask failed", zap.Error(err))
+	}
+	maskV2, err = io.ReadAll(maskReader)
+	if err != nil {
+		logging.Log().Fatal("load kgm mask failed", zap.Error(err))
+	}
+	fullMaskLen = len(maskV2) * 16
+	initMaskOK = true
+}

algo/kwm/kwm.go

@@ -2,73 +2,107 @@ package kwm
 
 import (
 	"bytes"
+	"encoding/binary"
 	"errors"
-	"fmt"
+	"github.com/unlock-music/cli/algo/common"
-	"io"
 	"strconv"
 	"strings"
 	"unicode"
-
-	"unlock-music.dev/cli/algo/common"
 )
 
-const magicHeader = "yeelion-kuwo-tme"
+var (
+	magicHeader = []byte{
+		0x79, 0x65, 0x65, 0x6C, 0x69, 0x6F, 0x6E, 0x2D,
+		0x6B, 0x75, 0x77, 0x6F, 0x2D, 0x74, 0x6D, 0x65}
+	ErrKwFileSize    = errors.New("kwm invalid file size")
+	ErrKwMagicHeader = errors.New("kwm magic header not matched")
+)
+
 const keyPreDefined = "MoOtOiTvINGwd2E6n0E1i7L5t2IoOoNk"
 
 type Decoder struct {
-	cipher common.StreamDecoder
+	file []byte
-
-	rd     io.ReadSeeker
-	offset int
 
+	key       []byte
 	outputExt string
 	bitrate   int
+	mask      []byte
+
+	audio []byte
+}
+
+func (d *Decoder) GetCoverImage() []byte {
+	return nil
+}
+
+func (d *Decoder) GetAudioData() []byte {
+	return d.audio
 }
 
 func (d *Decoder) GetAudioExt() string {
 	return "." + d.outputExt
 }
 
-func NewDecoder(rd io.ReadSeeker) common.Decoder {
+func (d *Decoder) GetMeta() common.Meta {
-	return &Decoder{rd: rd}
+	return nil
+}
+
+func NewDecoder(data []byte) common.Decoder {
+	//todo: Notice the input data will be changed for now
+	return &Decoder{file: data}
 }
 
 func (d *Decoder) Validate() error {
-	header := make([]byte, 0x400) // kwm header is fixed to 1024 bytes
+	lenData := len(d.file)
-	_, err := io.ReadFull(d.rd, header)
+	if lenData < 1024 {
-	if err != nil {
+		return ErrKwFileSize
-		return fmt.Errorf("kwm read header: %w", err)
 	}
-
+	if !bytes.Equal(magicHeader, d.file[:16]) {
-	// check magic header, 0x00 - 0x0F
+		return ErrKwMagicHeader
-	if !bytes.Equal([]byte(magicHeader), header[:len(magicHeader)]) {
-		return errors.New("kwm magic header not matched")
 	}
 
-	d.cipher = newKwmCipher(header[0x18:0x20])                      // Crypto Key, 0x18 - 0x1F
-	d.bitrate, d.outputExt = parseBitrateAndType(header[0x30:0x38]) // Bitrate & File Extension, 0x30 - 0x38
-
 	return nil
 }
 
-func parseBitrateAndType(header []byte) (int, string) {
+func generateMask(key []byte) []byte {
-	tmp := strings.TrimRight(string(header), "\x00")
+	keyInt := binary.LittleEndian.Uint64(key)
-	sep := strings.IndexFunc(tmp, func(r rune) bool {
+	keyStr := strconv.FormatUint(keyInt, 10)
-		return !unicode.IsDigit(r)
+	keyStrTrim := padOrTruncate(keyStr, 32)
-	})
+	mask := make([]byte, 32)
-
+	for i := 0; i < 32; i++ {
-	bitrate, _ := strconv.Atoi(tmp[:sep]) // just ignore the error
+		mask[i] = keyPreDefined[i] ^ keyStrTrim[i]
-	outputExt := strings.ToLower(tmp[sep:])
+	}
-	return bitrate, outputExt
+	return mask
 }
 
-func (d *Decoder) Read(b []byte) (int, error) {
+func (d *Decoder) parseBitrateAndType() {
-	n, err := d.rd.Read(b)
+	bitType := string(bytes.TrimRight(d.file[0x30:0x38], string(byte(0))))
-	if n > 0 {
+	charPos := 0
-		d.cipher.Decrypt(b[:n], d.offset)
+	for charPos = range bitType {
-		d.offset += n
+		if !unicode.IsNumber(rune(bitType[charPos])) {
+			break
+		}
 	}
-	return n, err
+	var err error
+	d.bitrate, err = strconv.Atoi(bitType[:charPos])
+	if err != nil {
+		d.bitrate = 0
+	}
+	d.outputExt = strings.ToLower(bitType[charPos:])
+
+}
+
+func (d *Decoder) Decode() error {
+	d.parseBitrateAndType()
+
+	d.mask = generateMask(d.file[0x18:0x20])
+
+	d.audio = d.file[1024:]
+	dataLen := len(d.audio)
+	for i := 0; i < dataLen; i++ {
+		d.audio[i] ^= d.mask[i&0x1F] //equals: [i % 32]
+	}
+	return nil
 }
 
 func padOrTruncate(raw string, length int) string {

algo/kwm/kwm_cipher.go

@@ -1,31 +0,0 @@
-package kwm
-
-import (
-	"encoding/binary"
-	"strconv"
-)
-
-type kwmCipher struct {
-	mask []byte
-}
-
-func newKwmCipher(key []byte) *kwmCipher {
-	return &kwmCipher{mask: generateMask(key)}
-}
-
-func generateMask(key []byte) []byte {
-	keyInt := binary.LittleEndian.Uint64(key)
-	keyStr := strconv.FormatUint(keyInt, 10)
-	keyStrTrim := padOrTruncate(keyStr, 32)
-	mask := make([]byte, 32)
-	for i := 0; i < 32; i++ {
-		mask[i] = keyPreDefined[i] ^ keyStrTrim[i]
-	}
-	return mask
-}
-
-func (c kwmCipher) Decrypt(buf []byte, offset int) {
-	for i := range buf {
-		buf[i] ^= c.mask[(offset+i)&0x1F] // equivalent: [i % 32]
-	}
-}

algo/ncm/meta.go

@@ -1,9 +1,8 @@
 package ncm
 
 import (
+	"github.com/unlock-music/cli/algo/common"
 	"strings"
-
-	"unlock-music.dev/cli/algo/common"
 )
 
 type RawMeta interface {

algo/ncm/ncm.go

@@ -2,44 +2,40 @@ package ncm
 
 import (
 	"bytes"
-	"context"
 	"encoding/base64"
 	"encoding/binary"
 	"encoding/json"
 	"errors"
-	"fmt"
+	"github.com/unlock-music/cli/algo/common"
-	"io"
+	"github.com/unlock-music/cli/internal/logging"
+	"github.com/unlock-music/cli/internal/utils"
+	"go.uber.org/zap"
+	"io/ioutil"
 	"net/http"
 	"strings"
-
-	"unlock-music.dev/cli/algo/common"
-	"unlock-music.dev/cli/internal/utils"
 )
 
-const magicHeader = "CTENFDAM"
-
 var (
+	magicHeader = []byte{
+		0x43, 0x54, 0x45, 0x4E, 0x46, 0x44, 0x41, 0x4D}
 	keyCore = []byte{
 		0x68, 0x7a, 0x48, 0x52, 0x41, 0x6d, 0x73, 0x6f,
-		0x35, 0x6b, 0x49, 0x6e, 0x62, 0x61, 0x78, 0x57,
+		0x35, 0x6b, 0x49, 0x6e, 0x62, 0x61, 0x78, 0x57}
-	}
 	keyMeta = []byte{
 		0x23, 0x31, 0x34, 0x6C, 0x6A, 0x6B, 0x5F, 0x21,
-		0x5C, 0x5D, 0x26, 0x30, 0x55, 0x3C, 0x27, 0x28,
+		0x5C, 0x5D, 0x26, 0x30, 0x55, 0x3C, 0x27, 0x28}
-	}
 )
 
-func NewDecoder(rd io.ReadSeeker) common.Decoder {
+func NewDecoder(data []byte) common.Decoder {
 	return &Decoder{
-		rd: rd,
+		file:    data,
+		fileLen: uint32(len(data)),
 	}
 }
 
 type Decoder struct {
-	rd     io.ReadSeeker
+	file    []byte
-	offset int
+	fileLen uint32
-
-	cipher common.StreamDecoder
 
 	key []byte
 	box []byte
@@ -50,128 +46,91 @@ type Decoder struct {
 
 	cover []byte
 	audio []byte
+
+	offsetKey   uint32
+	offsetMeta  uint32
+	offsetCover uint32
+	offsetAudio uint32
 }
 
 func (d *Decoder) Validate() error {
-	if err := d.validateMagicHeader(); err != nil {
+	if !bytes.Equal(magicHeader, d.file[:len(magicHeader)]) {
-		return err
-	}
-
-	if _, err := d.rd.Seek(2, io.SeekCurrent); err != nil { // 2 bytes gap
-		return fmt.Errorf("ncm seek file: %w", err)
-	}
-
-	keyData, err := d.readKeyData()
-	if err != nil {
-		return err
-	}
-
-	if err := d.readMetaData(); err != nil {
-		return fmt.Errorf("read meta date failed: %w", err)
-	}
-
-	if _, err := d.rd.Seek(5, io.SeekCurrent); err != nil { // 5 bytes gap
-		return fmt.Errorf("ncm seek gap: %w", err)
-	}
-
-	if err := d.readCoverData(); err != nil {
-		return fmt.Errorf("parse ncm cover file failed: %w", err)
-	}
-
-	if err := d.parseMeta(); err != nil {
-		return fmt.Errorf("parse meta failed: %w", err)
-	}
-
-	d.cipher = newNcmCipher(keyData)
-	return nil
-}
-
-func (d *Decoder) validateMagicHeader() error {
-	header := make([]byte, len(magicHeader)) // 0x00 - 0x07
-	if _, err := d.rd.Read(header); err != nil {
-		return fmt.Errorf("ncm read magic header: %w", err)
-	}
-
-	if !bytes.Equal([]byte(magicHeader), header) {
 		return errors.New("ncm magic header not match")
 	}
-
+	d.offsetKey = 8 + 2
 	return nil
 }
 
-func (d *Decoder) readKeyData() ([]byte, error) {
+func (d *Decoder) readKeyData() error {
-	bKeyLen := make([]byte, 4) //
+	if d.offsetKey == 0 || d.offsetKey+4 > d.fileLen {
-	if _, err := io.ReadFull(d.rd, bKeyLen); err != nil {
+		return errors.New("invalid cover file offset")
-		return nil, fmt.Errorf("ncm read key length: %w", err)
 	}
+	bKeyLen := d.file[d.offsetKey : d.offsetKey+4]
 	iKeyLen := binary.LittleEndian.Uint32(bKeyLen)
+	d.offsetMeta = d.offsetKey + 4 + iKeyLen
 
 	bKeyRaw := make([]byte, iKeyLen)
-	if _, err := io.ReadFull(d.rd, bKeyRaw); err != nil {
-		return nil, fmt.Errorf("ncm read key data: %w", err)
-	}
 	for i := uint32(0); i < iKeyLen; i++ {
-		bKeyRaw[i] ^= 0x64
+		bKeyRaw[i] = d.file[i+4+d.offsetKey] ^ 0x64
 	}
 
-	return utils.PKCS7UnPadding(utils.DecryptAES128ECB(bKeyRaw, keyCore))[17:], nil
+	d.key = utils.PKCS7UnPadding(utils.DecryptAes128Ecb(bKeyRaw, keyCore))[17:]
+	return nil
 }
 
 func (d *Decoder) readMetaData() error {
-	bMetaLen := make([]byte, 4) //
+	if d.offsetMeta == 0 || d.offsetMeta+4 > d.fileLen {
-	if _, err := io.ReadFull(d.rd, bMetaLen); err != nil {
+		return errors.New("invalid meta file offset")
-		return fmt.Errorf("ncm read key length: %w", err)
 	}
+	bMetaLen := d.file[d.offsetMeta : d.offsetMeta+4]
 	iMetaLen := binary.LittleEndian.Uint32(bMetaLen)
-
+	d.offsetCover = d.offsetMeta + 4 + iMetaLen
 	if iMetaLen == 0 {
-		return nil // no meta data
+		return errors.New("no any meta file found")
 	}
 
-	bMetaRaw := make([]byte, iMetaLen)
+	// Why sub 22: Remove "163 key(Don't modify):"
-	if _, err := io.ReadFull(d.rd, bMetaRaw); err != nil {
+	bKeyRaw := make([]byte, iMetaLen-22)
-		return fmt.Errorf("ncm read meta data: %w", err)
+	for i := uint32(0); i < iMetaLen-22; i++ {
-	}
+		bKeyRaw[i] = d.file[d.offsetMeta+4+22+i] ^ 0x63
-	bMetaRaw = bMetaRaw[22:] // skip "163 key(Don't modify):"
-	for i := 0; i < len(bMetaRaw); i++ {
-		bMetaRaw[i] ^= 0x63
 	}
 
-	cipherText, err := base64.StdEncoding.DecodeString(string(bMetaRaw))
+	cipherText, err := base64.StdEncoding.DecodeString(string(bKeyRaw))
 	if err != nil {
 		return errors.New("decode ncm meta failed: " + err.Error())
 	}
-	metaRaw := utils.PKCS7UnPadding(utils.DecryptAES128ECB(cipherText, keyMeta))
+	metaRaw := utils.PKCS7UnPadding(utils.DecryptAes128Ecb(cipherText, keyMeta))
-	sep := bytes.IndexByte(metaRaw, ':')
+	sepIdx := bytes.IndexRune(metaRaw, ':')
-	if sep == -1 {
+	if sepIdx == -1 {
 		return errors.New("invalid ncm meta file")
 	}
 
-	d.metaType = string(metaRaw[:sep])
+	d.metaType = string(metaRaw[:sepIdx])
-	d.metaRaw = metaRaw[sep+1:]
+	d.metaRaw = metaRaw[sepIdx+1:]
-
 	return nil
 }
 
-func (d *Decoder) readCoverData() error {
+func (d *Decoder) buildKeyBox() {
-	bCoverCRC := make([]byte, 4)
+	box := make([]byte, 256)
-	if _, err := io.ReadFull(d.rd, bCoverCRC); err != nil {
+	for i := 0; i < 256; i++ {
-		return fmt.Errorf("ncm read cover crc: %w", err)
+		box[i] = byte(i)
 	}
 
-	bCoverLen := make([]byte, 4) //
+	keyLen := len(d.key)
-	if _, err := io.ReadFull(d.rd, bCoverLen); err != nil {
+	var j byte
-		return fmt.Errorf("ncm read cover length: %w", err)
+	for i := 0; i < 256; i++ {
+		j = box[i] + j + d.key[i%keyLen]
+		box[i], box[j] = box[j], box[i]
 	}
-	iCoverLen := binary.LittleEndian.Uint32(bCoverLen)
 
-	coverBuf := make([]byte, iCoverLen)
+	d.box = make([]byte, 256)
-	if _, err := io.ReadFull(d.rd, coverBuf); err != nil {
+	var _i byte
-		return fmt.Errorf("ncm read cover data: %w", err)
+	for i := 0; i < 256; i++ {
+		_i = byte(i + 1)
+		si := box[_i]
+		sj := box[_i+si]
+		d.box[i] = box[si+sj]
 	}
-	d.cover = coverBuf
-
-	return nil
 }
 
 func (d *Decoder) parseMeta() error {
@@ -187,16 +146,59 @@ func (d *Decoder) parseMeta() error {
 	}
 }
 
-func (d *Decoder) Read(buf []byte) (int, error) {
+func (d *Decoder) readCoverData() error {
-	n, err := d.rd.Read(buf)
+	if d.offsetCover == 0 || d.offsetCover+13 > d.fileLen {
-	if n > 0 {
+		return errors.New("invalid cover file offset")
-		d.cipher.Decrypt(buf[:n], d.offset)
-		d.offset += n
 	}
-	return n, err
+
+	coverLenStart := d.offsetCover + 5 + 4
+	bCoverLen := d.file[coverLenStart : coverLenStart+4]
+
+	iCoverLen := binary.LittleEndian.Uint32(bCoverLen)
+	d.offsetAudio = coverLenStart + 4 + iCoverLen
+	if iCoverLen == 0 {
+		return errors.New("no any cover file found")
+	}
+	d.cover = d.file[coverLenStart+4 : 4+coverLenStart+iCoverLen]
+	return nil
 }
 
-func (d *Decoder) GetAudioExt() string {
+func (d *Decoder) readAudioData() error {
+	if d.offsetAudio == 0 || d.offsetAudio > d.fileLen {
+		return errors.New("invalid audio offset")
+	}
+	audioRaw := d.file[d.offsetAudio:]
+	audioLen := len(audioRaw)
+	d.audio = make([]byte, audioLen)
+	for i := uint32(0); i < uint32(audioLen); i++ {
+		d.audio[i] = d.box[i&0xff] ^ audioRaw[i]
+	}
+	return nil
+}
+
+func (d *Decoder) Decode() error {
+	if err := d.readKeyData(); err != nil {
+		return err
+	}
+	d.buildKeyBox()
+
+	err := d.readMetaData()
+	if err == nil {
+		err = d.parseMeta()
+	}
+	if err != nil {
+		logging.Log().Warn("parse ncm meta file failed", zap.Error(err))
+	}
+
+	err = d.readCoverData()
+	if err != nil {
+		logging.Log().Warn("parse ncm cover file failed", zap.Error(err))
+	}
+
+	return d.readAudioData()
+}
+
+func (d Decoder) GetAudioExt() string {
 	if d.meta != nil {
 		if format := d.meta.GetFormat(); format != "" {
 			return "." + d.meta.GetFormat()
@@ -205,34 +207,40 @@ func (d *Decoder) GetAudioExt() string {
 	return ""
 }
 
-func (d *Decoder) GetCoverImage(ctx context.Context) ([]byte, error) {
+func (d Decoder) GetAudioData() []byte {
-	if d.cover != nil {
+	return d.audio
-		return d.cover, nil
-	}
-	imgURL := d.meta.GetAlbumImageURL()
-	if d.meta != nil && !strings.HasPrefix(imgURL, "http") {
-		return nil, nil // no cover image
-	}
-
-	// fetch cover image
-	req, err := http.NewRequestWithContext(ctx, http.MethodGet, imgURL, nil)
-	resp, err := http.DefaultClient.Do(req)
-	if err != nil {
-		return nil, fmt.Errorf("download image failed: %w", err)
-	}
-	defer resp.Body.Close()
-
-	if resp.StatusCode != http.StatusOK {
-		return nil, fmt.Errorf("download image failed: unexpected http status %s", resp.Status)
-	}
-	data, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return nil, fmt.Errorf("download image failed: %w", err)
-	}
-	return data, nil
 }
 
-func (d *Decoder) GetMeta() common.Meta {
+func (d Decoder) GetCoverImage() []byte {
+	if d.cover != nil {
+		return d.cover
+	}
+	{
+		imgURL := d.meta.GetAlbumImageURL()
+		if d.meta != nil && !strings.HasPrefix(imgURL, "http") {
+			return nil
+		}
+		resp, err := http.Get(imgURL)
+		if err != nil {
+			logging.Log().Warn("download image failed", zap.Error(err), zap.String("url", imgURL))
+			return nil
+		}
+		defer resp.Body.Close()
+		if resp.StatusCode != http.StatusOK {
+			logging.Log().Warn("download image failed", zap.String("http", resp.Status),
+				zap.String("url", imgURL))
+			return nil
+		}
+		data, err := ioutil.ReadAll(resp.Body)
+		if err != nil {
+			logging.Log().Warn("download image failed", zap.Error(err), zap.String("url", imgURL))
+			return nil
+		}
+		return data
+	}
+}
+
+func (d Decoder) GetMeta() common.Meta {
 	return d.meta
 }
 

algo/ncm/ncm_cipher.go

@@ -1,42 +0,0 @@
-package ncm
-
-type ncmCipher struct {
-	key []byte
-	box []byte
-}
-
-func newNcmCipher(key []byte) *ncmCipher {
-	return &ncmCipher{
-		key: key,
-		box: buildKeyBox(key),
-	}
-}
-
-func (c *ncmCipher) Decrypt(buf []byte, offset int) {
-	for i := 0; i < len(buf); i++ {
-		buf[i] ^= c.box[(i+offset)&0xff]
-	}
-}
-
-func buildKeyBox(key []byte) []byte {
-	box := make([]byte, 256)
-	for i := 0; i < 256; i++ {
-		box[i] = byte(i)
-	}
-
-	var j byte
-	for i := 0; i < 256; i++ {
-		j = box[i] + j + key[i%len(key)]
-		box[i], box[j] = box[j], box[i]
-	}
-
-	ret := make([]byte, 256)
-	var _i byte
-	for i := 0; i < 256; i++ {
-		_i = byte(i + 1)
-		si := box[_i]
-		sj := box[_i+si]
-		ret[i] = box[si+sj]
-	}
-	return ret
-}

algo/qmc/cipher.go

@@ -0,0 +1,5 @@
+package qmc
+
+type streamCipher interface {
+	Decrypt(buf []byte, offset int)
+}

algo/qmc/cipher_map.go

@@ -8,7 +8,7 @@ type mapCipher struct {
 	size int
 }
 
-func newMapCipher(key []byte) (*mapCipher, error) {
+func NewMapCipher(key []byte) (*mapCipher, error) {
 	if len(key) == 0 {
 		return nil, errors.New("qmc/cipher_map: invalid key size")
 	}

algo/qmc/cipher_map_test.go

@@ -39,7 +39,7 @@ func Test_mapCipher_Decrypt(t *testing.T) {
 			if err != nil {
 				t.Fatalf("load testing data failed: %s", err)
 			}
-			c, err := newMapCipher(key)
+			c, err := NewMapCipher(key)
 			if err != nil {
 				t.Errorf("init mapCipher failed: %s", err)
 				return

algo/qmc/cipher_rc4.go

@@ -12,9 +12,9 @@ type rc4Cipher struct {
 	n    int
 }
 
-// newRC4Cipher creates and returns a new rc4Cipher. The key argument should be the
+// NewRC4Cipher creates and returns a new rc4Cipher. The key argument should be the
 // RC4 key, at least 1 byte and at most 256 bytes.
-func newRC4Cipher(key []byte) (*rc4Cipher, error) {
+func NewRC4Cipher(key []byte) (*rc4Cipher, error) {
 	n := len(key)
 	if n == 0 {
 		return nil, errors.New("qmc/cipher_rc4: invalid key size")

algo/qmc/cipher_rc4_test.go

@@ -37,7 +37,7 @@ func Test_rc4Cipher_Decrypt(t *testing.T) {
 			if err != nil {
 				t.Fatalf("load testing data failed: %s", err)
 			}
-			c, err := newRC4Cipher(key)
+			c, err := NewRC4Cipher(key)
 			if err != nil {
 				t.Errorf("init rc4Cipher failed: %s", err)
 				return
@@ -55,7 +55,7 @@ func BenchmarkRc4Cipher_Decrypt(b *testing.B) {
 	if err != nil {
 		b.Fatalf("load testing data failed: %s", err)
 	}
-	c, err := newRC4Cipher(key)
+	c, err := NewRC4Cipher(key)
 	if err != nil {
 		b.Errorf("init rc4Cipher failed: %s", err)
 		return
@@ -72,7 +72,7 @@ func Test_rc4Cipher_encFirstSegment(t *testing.T) {
 		t.Fatalf("load testing data failed: %s", err)
 	}
 	t.Run("first-block(0~128)", func(t *testing.T) {
-		c, err := newRC4Cipher(key)
+		c, err := NewRC4Cipher(key)
 		if err != nil {
 			t.Errorf("init rc4Cipher failed: %s", err)
 			return
@@ -91,7 +91,7 @@ func Test_rc4Cipher_encASegment(t *testing.T) {
 	}
 
 	t.Run("align-block(128~5120)", func(t *testing.T) {
-		c, err := newRC4Cipher(key)
+		c, err := NewRC4Cipher(key)
 		if err != nil {
 			t.Errorf("init rc4Cipher failed: %s", err)
 			return
@@ -102,7 +102,7 @@ func Test_rc4Cipher_encASegment(t *testing.T) {
 		}
 	})
 	t.Run("simple-block(5120~10240)", func(t *testing.T) {
-		c, err := newRC4Cipher(key)
+		c, err := NewRC4Cipher(key)
 		if err != nil {
 			t.Errorf("init rc4Cipher failed: %s", err)
 			return

algo/qmc/cipher_static.go

@@ -1,6 +1,6 @@
 package qmc
 
-func newStaticCipher() *staticCipher {
+func NewStaticCipher() *staticCipher {
 	return &defaultStaticCipher
 }
 

algo/qmc/key_dec.go

@@ -1,10 +1,8 @@
 package qmc
 
 import (
-	"bytes"
 	"encoding/base64"
 	"errors"
-	"fmt"
 	"math"
 
 	"golang.org/x/crypto/tea"
@@ -18,30 +16,16 @@ func simpleMakeKey(salt byte, length int) []byte {
 	}
 	return keyBuf
 }
-
+func DecryptKey(rawKey []byte) ([]byte, error) {
-const rawKeyPrefixV2 = "QQMusic EncV2,Key:"
-
-func deriveKey(rawKey []byte) ([]byte, error) {
 	rawKeyDec := make([]byte, base64.StdEncoding.DecodedLen(len(rawKey)))
 	n, err := base64.StdEncoding.Decode(rawKeyDec, rawKey)
 	if err != nil {
 		return nil, err
 	}
-	rawKeyDec = rawKeyDec[:n]
+	if n < 16 {
-
-	if bytes.HasPrefix(rawKeyDec, []byte(rawKeyPrefixV2)) {
-		rawKeyDec, err = deriveKeyV2(bytes.TrimPrefix(rawKeyDec, []byte(rawKeyPrefixV2)))
-		if err != nil {
-			return nil, fmt.Errorf("deriveKeyV2 failed: %w", err)
-		}
-	}
-	return deriveKeyV1(rawKeyDec)
-}
-
-func deriveKeyV1(rawKeyDec []byte) ([]byte, error) {
-	if len(rawKeyDec) < 16 {
 		return nil, errors.New("key length is too short")
 	}
+	rawKeyDec = rawKeyDec[:n]
 
 	simpleKey := simpleMakeKey(106, 8)
 	teaKey := make([]byte, 16)
@@ -56,37 +40,6 @@ func deriveKeyV1(rawKeyDec []byte) ([]byte, error) {
 	}
 	return append(rawKeyDec[:8], rs...), nil
 }
-
-var (
-	deriveV2Key1 = []byte{
-		0x33, 0x38, 0x36, 0x5A, 0x4A, 0x59, 0x21, 0x40,
-		0x23, 0x2A, 0x24, 0x25, 0x5E, 0x26, 0x29, 0x28,
-	}
-
-	deriveV2Key2 = []byte{
-		0x2A, 0x2A, 0x23, 0x21, 0x28, 0x23, 0x24, 0x25,
-		0x26, 0x5E, 0x61, 0x31, 0x63, 0x5A, 0x2C, 0x54,
-	}
-)
-
-func deriveKeyV2(raw []byte) ([]byte, error) {
-	buf, err := decryptTencentTea(raw, deriveV2Key1)
-	if err != nil {
-		return nil, err
-	}
-
-	buf, err = decryptTencentTea(buf, deriveV2Key2)
-	if err != nil {
-		return nil, err
-	}
-
-	n, err := base64.StdEncoding.Decode(buf, buf)
-	if err != nil {
-		return nil, err
-	}
-	return buf[:n], nil
-}
-
 func decryptTencentTea(inBuf []byte, key []byte) ([]byte, error) {
 	const saltLen = 2
 	const zeroLen = 7
@@ -106,7 +59,9 @@ func decryptTencentTea(inBuf []byte, key []byte) ([]byte, error) {
 	blk.Decrypt(destBuf, inBuf)
 	padLen := int(destBuf[0] & 0x7)
 	outLen := len(inBuf) - 1 - padLen - saltLen - zeroLen
-
+	if padLen+saltLen != 8 {
+		return nil, errors.New("invalid pad len")
+	}
 	out := make([]byte, outLen)
 
 	ivPrev := make([]byte, 8)
@@ -153,7 +108,6 @@ func decryptTencentTea(inBuf []byte, key []byte) ([]byte, error) {
 
 	return out, nil
 }
-
 func xor8Bytes(dst, a, b []byte) {
 	for i := 0; i < 8; i++ {
 		dst[i] = a[i] ^ b[i]

algo/qmc/key_dec_test.go

@@ -43,13 +43,13 @@ func TestDecryptKey(t *testing.T) {
 			if err != nil {
 				t.Fatalf("load test data failed: %s", err)
 			}
-			got, err := deriveKey(raw)
+			got, err := DecryptKey(raw)
 			if (err != nil) != tt.wantErr {
-				t.Errorf("deriveKey() error = %v, wantErr %v", err, tt.wantErr)
+				t.Errorf("DecryptKey() error = %v, wantErr %v", err, tt.wantErr)
 				return
 			}
 			if !reflect.DeepEqual(got, want) {
-				t.Errorf("deriveKey() got = %v..., want %v...",
+				t.Errorf("DecryptKey() got = %v..., want %v...",
 					string(got[:32]), string(want[:32]))
 			}
 		})

algo/qmc/qmc.go

@@ -4,23 +4,22 @@ import (
 	"bytes"
 	"encoding/binary"
 	"errors"
-	"fmt"
 	"io"
 	"strconv"
 	"strings"
 
-	"unlock-music.dev/cli/algo/common"
+	"github.com/unlock-music/cli/algo/common"
 )
 
 type Decoder struct {
-	raw      io.ReadSeeker
+	r       io.ReadSeeker
-	audio    io.Reader
+	fileExt string
-	offset   int
-	audioLen int
 
-	cipher common.StreamDecoder
+	audioLen   int
+	decodedKey []byte
+	cipher     streamCipher
+	offset     int
 
-	decodedKey    []byte
 	rawMetaExtra1 int
 	rawMetaExtra2 int
 }
@@ -28,113 +27,113 @@ type Decoder struct {
 // Read implements io.Reader, offer the decrypted audio data.
 // Validate should call before Read to check if the file is valid.
 func (d *Decoder) Read(p []byte) (int, error) {
-	n, err := d.audio.Read(p)
+	n := len(p)
-	if n > 0 {
+	if d.audioLen-d.offset <= 0 {
-		d.cipher.Decrypt(p[:n], d.offset)
+		return 0, io.EOF
-		d.offset += n
+	} else if d.audioLen-d.offset < n {
+		n = d.audioLen - d.offset
 	}
-	return n, err
+	m, err := d.r.Read(p[:n])
+	if m == 0 {
+		return 0, err
+	}
+
+	d.cipher.Decrypt(p[:m], d.offset)
+	d.offset += m
+	return m, err
 }
 
-func NewDecoder(r io.ReadSeeker) common.Decoder {
+func NewDecoder(r io.ReadSeeker) (*Decoder, error) {
-	return &Decoder{raw: r}
+	d := &Decoder{r: r}
+	err := d.searchKey()
+	if err != nil {
+		return nil, err
+	}
+
+	if len(d.decodedKey) > 300 {
+		d.cipher, err = NewRC4Cipher(d.decodedKey)
+		if err != nil {
+			return nil, err
+		}
+	} else if len(d.decodedKey) != 0 {
+		d.cipher, err = NewMapCipher(d.decodedKey)
+		if err != nil {
+			return nil, err
+		}
+	} else {
+		d.cipher = NewStaticCipher()
+	}
+
+	_, err = d.r.Seek(0, io.SeekStart)
+	if err != nil {
+		return nil, err
+	}
+
+	return d, nil
 }
 
 func (d *Decoder) Validate() error {
-	// search & derive key
-	err := d.searchKey()
-	if err != nil {
-		return err
-	}
-
-	// check cipher type and init decode cipher
-	if len(d.decodedKey) > 300 {
-		d.cipher, err = newRC4Cipher(d.decodedKey)
-		if err != nil {
-			return err
-		}
-	} else if len(d.decodedKey) != 0 {
-		d.cipher, err = newMapCipher(d.decodedKey)
-		if err != nil {
-			return err
-		}
-	} else {
-		d.cipher = newStaticCipher()
-	}
-
-	// test with first 16 bytes
-	if err := d.validateDecode(); err != nil {
-		return err
-	}
-
-	// reset position, limit to audio, prepare for Read
-	if _, err := d.raw.Seek(0, io.SeekStart); err != nil {
-		return err
-	}
-	d.audio = io.LimitReader(d.raw, int64(d.audioLen))
-
-	return nil
-}
-
-func (d *Decoder) validateDecode() error {
-	_, err := d.raw.Seek(0, io.SeekStart)
-	if err != nil {
-		return fmt.Errorf("qmc seek to start: %w", err)
-	}
-
 	buf := make([]byte, 16)
-	if _, err := io.ReadFull(d.raw, buf); err != nil {
+	if _, err := io.ReadFull(d.r, buf); err != nil {
-		return fmt.Errorf("qmc read header: %w", err)
+		return err
+	}
+	_, err := d.r.Seek(0, io.SeekStart)
+	if err != nil {
+		return err
 	}
 
 	d.cipher.Decrypt(buf, 0)
-	_, ok := common.SniffAll(buf)
+	fileExt, ok := common.SniffAll(buf)
 	if !ok {
-		return errors.New("qmc: detect file type failed")
+		return errors.New("detect file type failed")
 	}
+	d.fileExt = fileExt
 	return nil
 }
 
+func (d Decoder) GetFileExt() string {
+	return d.fileExt
+}
+
 func (d *Decoder) searchKey() error {
-	fileSizeM4, err := d.raw.Seek(-4, io.SeekEnd)
+	fileSizeM4, err := d.r.Seek(-4, io.SeekEnd)
 	if err != nil {
 		return err
 	}
-	buf, err := io.ReadAll(io.LimitReader(d.raw, 4))
+	buf, err := io.ReadAll(io.LimitReader(d.r, 4))
 	if err != nil {
 		return err
 	}
 	if string(buf) == "QTag" {
-		return d.readRawMetaQTag()
+		if err := d.readRawMetaQTag(); err != nil {
-	} else if string(buf) == "STag" {
+			return err
-		return errors.New("qmc: file with 'STag' suffix doesn't contains media key")
+		}
 	} else {
 		size := binary.LittleEndian.Uint32(buf)
-		if size <= 0xFFFF && size != 0 { // assume size is key len
+		if size < 0x300 && size != 0 {
 			return d.readRawKey(int64(size))
+		} else {
+			// try to use default static cipher
+			d.audioLen = int(fileSizeM4 + 4)
+			return nil
 		}
-		// try to use default static cipher
-		d.audioLen = int(fileSizeM4 + 4)
-		return nil
 	}
+	return nil
 }
 
 func (d *Decoder) readRawKey(rawKeyLen int64) error {
-	audioLen, err := d.raw.Seek(-(4 + rawKeyLen), io.SeekEnd)
+	audioLen, err := d.r.Seek(-(4 + rawKeyLen), io.SeekEnd)
 	if err != nil {
 		return err
 	}
 	d.audioLen = int(audioLen)
 
-	rawKeyData, err := io.ReadAll(io.LimitReader(d.raw, rawKeyLen))
+	rawKeyData, err := io.ReadAll(io.LimitReader(d.r, rawKeyLen))
 	if err != nil {
 		return err
 	}
 
-	// clean suffix NULs
+	d.decodedKey, err = DecryptKey(rawKeyData)
-	rawKeyData = bytes.TrimRight(rawKeyData, "\x00")
-
-	d.decodedKey, err = deriveKey(rawKeyData)
 	if err != nil {
 		return err
 	}
@@ -144,22 +143,22 @@ func (d *Decoder) readRawKey(rawKeyLen int64) error {
 
 func (d *Decoder) readRawMetaQTag() error {
 	// get raw meta data len
-	if _, err := d.raw.Seek(-8, io.SeekEnd); err != nil {
+	if _, err := d.r.Seek(-8, io.SeekEnd); err != nil {
 		return err
 	}
-	buf, err := io.ReadAll(io.LimitReader(d.raw, 4))
+	buf, err := io.ReadAll(io.LimitReader(d.r, 4))
 	if err != nil {
 		return err
 	}
 	rawMetaLen := int64(binary.BigEndian.Uint32(buf))
 
 	// read raw meta data
-	audioLen, err := d.raw.Seek(-(8 + rawMetaLen), io.SeekEnd)
+	audioLen, err := d.r.Seek(-(8 + rawMetaLen), io.SeekEnd)
 	if err != nil {
 		return err
 	}
 	d.audioLen = int(audioLen)
-	rawMetaData, err := io.ReadAll(io.LimitReader(d.raw, rawMetaLen))
+	rawMetaData, err := io.ReadAll(io.LimitReader(d.r, rawMetaLen))
 	if err != nil {
 		return err
 	}
@@ -169,7 +168,7 @@ func (d *Decoder) readRawMetaQTag() error {
 		return errors.New("invalid raw meta data")
 	}
 
-	d.decodedKey, err = deriveKey([]byte(items[0]))
+	d.decodedKey, err = DecryptKey([]byte(items[0]))
 	if err != nil {
 		return err
 	}
@@ -208,6 +207,57 @@ func init() {
 		"mflac", "mflac0", //QQ Music New Flac
 	}
 	for _, ext := range supportedExts {
-		common.RegisterDecoder(ext, false, NewDecoder)
+		common.RegisterDecoder(ext, false, newCompactDecoder)
 	}
 }
+
+type compactDecoder struct {
+	decoder   *Decoder
+	createErr error
+	buf       *bytes.Buffer
+}
+
+func newCompactDecoder(p []byte) common.Decoder {
+	r := bytes.NewReader(p)
+	d, err := NewDecoder(r)
+	c := compactDecoder{
+		decoder:   d,
+		createErr: err,
+	}
+	return &c
+}
+
+func (c *compactDecoder) Validate() error {
+	if c.createErr != nil {
+		return c.createErr
+	}
+	return c.decoder.Validate()
+}
+
+func (c *compactDecoder) Decode() error {
+	if c.createErr != nil {
+		return c.createErr
+	}
+	c.buf = bytes.NewBuffer(nil)
+	_, err := io.Copy(c.buf, c.decoder)
+	return err
+}
+
+func (c *compactDecoder) GetCoverImage() []byte {
+	return nil
+}
+
+func (c *compactDecoder) GetAudioData() []byte {
+	return c.buf.Bytes()
+}
+
+func (c *compactDecoder) GetAudioExt() string {
+	if c.createErr != nil {
+		return ""
+	}
+	return c.decoder.GetFileExt()
+}
+
+func (c *compactDecoder) GetMeta() common.Meta {
+	return nil
+}

algo/tm/tm.go

@@ -3,54 +3,77 @@ package tm
 import (
 	"bytes"
 	"errors"
-	"fmt"
+	"github.com/unlock-music/cli/algo/common"
-	"io"
-
-	"unlock-music.dev/cli/algo/common"
 )
 
 var replaceHeader = []byte{0x00, 0x00, 0x00, 0x20, 0x66, 0x74, 0x79, 0x70}
 var magicHeader = []byte{0x51, 0x51, 0x4D, 0x55} //0x15, 0x1D, 0x1A, 0x21
 
 type Decoder struct {
-	raw    io.ReadSeeker
+	file        []byte
-	offset int
+	audio       []byte
-	audio  io.Reader
+	headerMatch bool
+	audioExt    string
+}
+
+func (d *Decoder) GetCoverImage() []byte {
+	return nil
+}
+
+func (d *Decoder) GetAudioData() []byte {
+	return d.audio
+}
+
+func (d *Decoder) GetAudioExt() string {
+	if d.audioExt != "" {
+		return "." + d.audioExt
+	}
+	return ""
+}
+
+func (d *Decoder) GetMeta() common.Meta {
+	return nil
 }
 
 func (d *Decoder) Validate() error {
-	header := make([]byte, 8)
+	if len(d.file) < 8 {
-	if _, err := io.ReadFull(d.raw, header); err != nil {
+		return errors.New("invalid file size")
-		return fmt.Errorf("tm read header: %w", err)
 	}
-
+	if !bytes.Equal(magicHeader, d.file[:4]) {
-	if bytes.Equal(magicHeader, header[:len(magicHeader)]) { // replace m4a header
+		return errors.New("not a valid tm file")
-		d.audio = io.MultiReader(bytes.NewReader(replaceHeader), d.raw)
-		return nil
 	}
-
+	d.headerMatch = true
-	if _, ok := common.SniffAll(header); ok { // not encrypted
+	return nil
-		d.audio = io.MultiReader(bytes.NewReader(header), d.raw)
-		return nil
-	}
-
-	return errors.New("tm: valid magic header")
 }
 
-func (d *Decoder) Read(buf []byte) (int, error) {
+func (d *Decoder) Decode() error {
-	return d.audio.Read(buf)
+	d.audio = d.file
+	if d.headerMatch {
+		for i := 0; i < 8; i++ {
+			d.audio[i] = replaceHeader[i]
+		}
+		d.audioExt = "m4a"
+	}
+	return nil
 }
 
-func NewTmDecoder(rd io.ReadSeeker) common.Decoder {
+//goland:noinspection GoUnusedExportedFunction
-	return &Decoder{raw: rd}
+func NewDecoder(data []byte) common.Decoder {
+	return &Decoder{file: data}
+}
+
+func DecoderFuncWithExt(ext string) common.NewDecoderFunc {
+	return func(file []byte) common.Decoder {
+		return &Decoder{file: file, audioExt: ext}
+	}
 }
 
 func init() {
-	// QQ Music IOS M4a (replace header)
+	// QQ Music IOS M4a
-	common.RegisterDecoder("tm2", false, NewTmDecoder)
+	common.RegisterDecoder("tm2", false, DecoderFuncWithExt("m4a"))
-	common.RegisterDecoder("tm6", false, NewTmDecoder)
+	common.RegisterDecoder("tm6", false, DecoderFuncWithExt("m4a"))
+	// QQ Music IOS Mp3
+	common.RegisterDecoder("tm0", false, common.NewRawDecoder)
+	common.RegisterDecoder("tm3", false, common.NewRawDecoder)
 
-	// QQ Music IOS Mp3 (not encrypted)
-	common.RegisterDecoder("tm0", false, NewTmDecoder)
-	common.RegisterDecoder("tm3", false, NewTmDecoder)
 }

algo/xm/xm.go

@@ -3,10 +3,9 @@ package xm
 import (
 	"bytes"
 	"errors"
-	"fmt"
+	"github.com/unlock-music/cli/algo/common"
-	"io"
+	"github.com/unlock-music/cli/internal/logging"
-
+	"go.uber.org/zap"
-	"unlock-music.dev/cli/algo/common"
 )
 
 var (
@@ -18,19 +17,26 @@ var (
 		" MP3": "mp3",
 		" A4M": "m4a",
 	}
+	ErrFileSize    = errors.New("xm invalid file size")
 	ErrMagicHeader = errors.New("xm magic header not matched")
 )
 
 type Decoder struct {
-	rd     io.ReadSeeker
+	file      []byte
-	offset int
+	headerLen uint32
-
-	cipher    common.StreamDecoder
 	outputExt string
 	mask      byte
 	audio     []byte
 }
 
+func (d *Decoder) GetCoverImage() []byte {
+	return nil
+}
+
+func (d *Decoder) GetAudioData() []byte {
+	return d.audio
+}
+
 func (d *Decoder) GetAudioExt() string {
 	if d.outputExt != "" {
 		return "." + d.outputExt
@@ -39,53 +45,62 @@ func (d *Decoder) GetAudioExt() string {
 	return ""
 }
 
-func NewDecoder(rd io.ReadSeeker) common.Decoder {
+func (d *Decoder) GetMeta() common.Meta {
-	return &Decoder{rd: rd}
-}
-
-func (d *Decoder) Validate() error {
-	header := make([]byte, 16) // xm header is fixed to 16 bytes
-
-	if _, err := io.ReadFull(d.rd, header); err != nil {
-		return fmt.Errorf("xm read header: %w", err)
-	}
-
-	// 0x00 - 0x03 and 0x08 - 0x0B: magic header
-	if !bytes.Equal(magicHeader, header[:4]) || !bytes.Equal(magicHeader2, header[8:12]) {
-		return ErrMagicHeader
-	}
-
-	// 0x04 - 0x07: Audio File Type
-	var ok bool
-	d.outputExt, ok = typeMapping[string(header[4:8])]
-	if !ok {
-		return fmt.Errorf("xm detect unknown audio type: %s", string(header[4:8]))
-	}
-
-	// 0x0C - 0x0E, Encrypt Start At, LittleEndian Unit24
-	encStartAt := uint32(header[12]) | uint32(header[13])<<8 | uint32(header[14])<<16
-
-	// 0x0F, XOR Mask
-	d.cipher = newXmCipher(header[15], int(encStartAt))
-
 	return nil
 }
 
-func (d *Decoder) Read(p []byte) (int, error) {
+func NewDecoder(data []byte) common.Decoder {
-	n, err := d.rd.Read(p)
+	return &Decoder{file: data}
-	if n > 0 {
+}
-		d.cipher.Decrypt(p[:n], d.offset)
+
-		d.offset += n
+func (d *Decoder) Validate() error {
+	lenData := len(d.file)
+	if lenData < 16 {
+		return ErrFileSize
+	}
+	if !bytes.Equal(magicHeader, d.file[:4]) ||
+		!bytes.Equal(magicHeader2, d.file[8:12]) {
+		return ErrMagicHeader
+	}
+
+	var ok bool
+	d.outputExt, ok = typeMapping[string(d.file[4:8])]
+	if !ok {
+		return errors.New("detect unknown xm file type: " + string(d.file[4:8]))
+	}
+
+	if d.file[14] != 0 {
+		logging.Log().Warn("not a simple xm file", zap.Uint8("b[14]", d.file[14]))
+	}
+	d.headerLen = uint32(d.file[12]) | uint32(d.file[13])<<8 | uint32(d.file[14])<<16 // LittleEndian Unit24
+	if d.headerLen+16 > uint32(lenData) {
+		return ErrFileSize
+	}
+	return nil
+}
+
+func (d *Decoder) Decode() error {
+	d.mask = d.file[15]
+	d.audio = d.file[16:]
+	dataLen := uint32(len(d.audio))
+	for i := d.headerLen; i < dataLen; i++ {
+		d.audio[i] = ^(d.audio[i] - d.mask)
+	}
+	return nil
+}
+
+func DecoderFuncWithExt(ext string) common.NewDecoderFunc {
+	return func(file []byte) common.Decoder {
+		return &Decoder{file: file, outputExt: ext}
 	}
-	return n, err
 }
 
 func init() {
 	// Xiami Wav/M4a/Mp3/Flac
 	common.RegisterDecoder("xm", false, NewDecoder)
 	// Xiami Typed Format
-	common.RegisterDecoder("wav", false, NewDecoder)
+	common.RegisterDecoder("wav", false, DecoderFuncWithExt("wav"))
-	common.RegisterDecoder("mp3", false, NewDecoder)
+	common.RegisterDecoder("mp3", false, DecoderFuncWithExt("mp3"))
-	common.RegisterDecoder("flac", false, NewDecoder)
+	common.RegisterDecoder("flac", false, DecoderFuncWithExt("flac"))
-	common.RegisterDecoder("m4a", false, NewDecoder)
+	common.RegisterDecoder("m4a", false, DecoderFuncWithExt("m4a"))
 }

algo/xm/xm_cipher.go

@@ -1,21 +0,0 @@
-package xm
-
-type xmCipher struct {
-	mask           byte
-	encryptStartAt int
-}
-
-func newXmCipher(mask byte, encryptStartAt int) *xmCipher {
-	return &xmCipher{
-		mask:           mask,
-		encryptStartAt: encryptStartAt,
-	}
-}
-
-func (c *xmCipher) Decrypt(buf []byte, offset int) {
-	for i := 0; i < len(buf); i++ {
-		if offset+i >= c.encryptStartAt {
-			buf[i] ^= c.mask
-		}
-	}
-}

cmd/um/main.go

@@ -1,44 +1,34 @@
 package main
 
 import (
-	"bytes"
 	"errors"
 	"fmt"
-	"io"
 	"os"
 	"path/filepath"
 	"runtime"
-	"runtime/debug"
 	"sort"
 	"strings"
-	"time"
 
 	"github.com/urfave/cli/v2"
 	"go.uber.org/zap"
 
-	"unlock-music.dev/cli/algo/common"
+	"github.com/unlock-music/cli/algo/common"
-	_ "unlock-music.dev/cli/algo/kgm"
+	_ "github.com/unlock-music/cli/algo/kgm"
-	_ "unlock-music.dev/cli/algo/kwm"
+	_ "github.com/unlock-music/cli/algo/kwm"
-	_ "unlock-music.dev/cli/algo/ncm"
+	_ "github.com/unlock-music/cli/algo/ncm"
-	_ "unlock-music.dev/cli/algo/qmc"
+	_ "github.com/unlock-music/cli/algo/qmc"
-	_ "unlock-music.dev/cli/algo/tm"
+	_ "github.com/unlock-music/cli/algo/tm"
-	_ "unlock-music.dev/cli/algo/xm"
+	_ "github.com/unlock-music/cli/algo/xm"
-	"unlock-music.dev/cli/internal/logging"
+	"github.com/unlock-music/cli/internal/logging"
 )
 
 var AppVersion = "v0.0.6"
 
-var logger, _ = logging.NewZapLogger() // TODO: inject logger to application, instead of using global logger
-
 func main() {
-	module, ok := debug.ReadBuildInfo()
-	if ok && module.Main.Version != "(devel)" {
-		AppVersion = module.Main.Version
-	}
 	app := cli.App{
 		Name:     "Unlock Music CLI",
 		HelpName: "um",
-		Usage:    "Unlock your encrypted music file https://git.unlock-music.dev/um/cli",
+		Usage:    "Unlock your encrypted music file https://github.com/unlock-music/cli",
 		Version:  fmt.Sprintf("%s (%s,%s/%s)", AppVersion, runtime.Version(), runtime.GOOS, runtime.GOARCH),
 		Flags: []cli.Flag{
 			&cli.StringFlag{Name: "input", Aliases: []string{"i"}, Usage: "path to input file or dir", Required: false},
@@ -49,17 +39,17 @@ func main() {
 		},
 
 		Action:          appMain,
-		Copyright:       fmt.Sprintf("Copyright (c) 2020 - %d Unlock Music https://git.unlock-music.dev/um/cli/src/branch/master/LICENSE", time.Now().Year()),
+		Copyright:       "Copyright (c) 2020 - 2021 Unlock Music https://github.com/unlock-music/cli/blob/master/LICENSE",
 		HideHelpCommand: true,
 		UsageText:       "um [-o /path/to/output/dir] [--extra-flags] [-i] /path/to/input",
 	}
 	err := app.Run(os.Args)
 	if err != nil {
-		logger.Fatal("run app failed", zap.Error(err))
+		logging.Log().Fatal("run app failed", zap.Error(err))
 	}
 }
 func printSupportedExtensions() {
-	var exts []string
+	exts := []string{}
 	for ext := range common.DecoderRegistry {
 		exts = append(exts, ext)
 	}
@@ -125,7 +115,7 @@ func appMain(c *cli.Context) (err error) {
 	} else {
 		allDec := common.GetDecoder(inputStat.Name(), skipNoop)
 		if len(allDec) == 0 {
-			logger.Fatal("skipping while no suitable decoder")
+			logging.Log().Fatal("skipping while no suitable decoder")
 		}
 		return tryDecFile(input, output, allDec, removeSource)
 	}
@@ -142,64 +132,56 @@ func dealDirectory(inputDir string, outputDir string, skipNoop bool, removeSourc
 		}
 		allDec := common.GetDecoder(item.Name(), skipNoop)
 		if len(allDec) == 0 {
-			logger.Info("skipping while no suitable decoder", zap.String("file", item.Name()))
+			logging.Log().Info("skipping while no suitable decoder", zap.String("file", item.Name()))
 			continue
 		}
 
 		err := tryDecFile(filepath.Join(inputDir, item.Name()), outputDir, allDec, removeSource)
 		if err != nil {
-			logger.Error("conversion failed", zap.String("source", item.Name()), zap.Error(err))
+			logging.Log().Error("conversion failed", zap.String("source", item.Name()))
 		}
 	}
 	return nil
 }
 
 func tryDecFile(inputFile string, outputDir string, allDec []common.NewDecoderFunc, removeSource bool) error {
-	file, err := os.Open(inputFile)
+	file, err := os.ReadFile(inputFile)
 	if err != nil {
 		return err
 	}
-	defer file.Close()
 
 	var dec common.Decoder
 	for _, decFunc := range allDec {
 		dec = decFunc(file)
 		if err := dec.Validate(); err == nil {
 			break
-		} else {
-			logger.Warn("try decode failed", zap.Error(err))
-			dec = nil
 		}
+		logging.Log().Warn("try decode failed", zap.Error(err))
+		dec = nil
 	}
 	if dec == nil {
 		return errors.New("no any decoder can resolve the file")
 	}
-
+	if err := dec.Decode(); err != nil {
-	header := bytes.NewBuffer(nil)
+		return errors.New("failed while decoding: " + err.Error())
-	_, err = io.CopyN(header, dec, 16)
-	if err != nil {
-		return fmt.Errorf("read header failed: %w", err)
 	}
 
-	outExt := ".mp3"
+	outData := dec.GetAudioData()
-	if ext, ok := common.SniffAll(header.Bytes()); ok {
+	outExt := dec.GetAudioExt()
-		outExt = ext
+	if outExt == "" {
+		if ext, ok := common.SniffAll(outData); ok {
+			outExt = ext
+		} else {
+			outExt = ".mp3"
+		}
 	}
 	filenameOnly := strings.TrimSuffix(filepath.Base(inputFile), filepath.Ext(inputFile))
 
 	outPath := filepath.Join(outputDir, filenameOnly+outExt)
-	outFile, err := os.OpenFile(outPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
+	err = os.WriteFile(outPath, outData, 0644)
 	if err != nil {
 		return err
 	}
-	defer outFile.Close()
-
-	if _, err := io.Copy(outFile, header); err != nil {
-		return err
-	}
-	if _, err := io.Copy(outFile, dec); err != nil {
-		return err
-	}
 
 	// if source file need to be removed
 	if removeSource {
@@ -207,9 +189,9 @@ func tryDecFile(inputFile string, outputDir string, allDec []common.NewDecoderFu
 		if err != nil {
 			return err
 		}
-		logger.Info("successfully converted, and source file is removed", zap.String("source", inputFile), zap.String("destination", outPath))
+		logging.Log().Info("successfully converted, and source file is removed", zap.String("source", inputFile), zap.String("destination", outPath))
 	} else {
-		logger.Info("successfully converted", zap.String("source", inputFile), zap.String("destination", outPath))
+		logging.Log().Info("successfully converted", zap.String("source", inputFile), zap.String("destination", outPath))
 	}
 
 	return nil

go.mod

@@ -1,17 +1,17 @@
-module unlock-music.dev/cli
+module github.com/unlock-music/cli
 
 go 1.17
 
 require (
-	github.com/urfave/cli/v2 v2.23.5
+	github.com/ulikunitz/xz v0.5.10
-	go.uber.org/zap v1.23.0
+	github.com/urfave/cli/v2 v2.3.0
-	golang.org/x/crypto v0.3.0
+	go.uber.org/zap v1.19.1
+	golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550
 )
 
 require (
-	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.1 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
-	github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 // indirect
+	go.uber.org/atomic v1.9.0 // indirect
-	go.uber.org/atomic v1.10.0 // indirect
+	go.uber.org/multierr v1.7.0 // indirect
-	go.uber.org/multierr v1.8.0 // indirect
 )

go.sum

@@ -1,8 +1,9 @@
-github.com/BurntSushi/toml v1.2.1/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/benbjohnson/clock v1.1.0 h1:Q92kusRqC1XV2MjkWETPvjJVqKetz1OzxZB7mHJLju8=
 github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
-github.com/cpuguy83/go-md2man/v2 v2.0.2 h1:p1EgwI/C7NhT0JmVkwCD2ZBK8j4aeHQX2pMHHBfMQ6w=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
-github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/cpuguy83/go-md2man/v2 v2.0.1 h1:r/myEWzV9lfsM1tFLgDyu0atFtJ1fXn261LKYj/3DxU=
+github.com/cpuguy83/go-md2man/v2 v2.0.1/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -13,76 +14,60 @@ github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/ulikunitz/xz v0.5.10 h1:t92gobL9l3HE202wg3rlk19F6X+JOxl9BBrCCMYEYd8=
-github.com/stretchr/testify v1.8.0 h1:pSgiaMZlXftHpm5L7V1+rVB+AZJydKsMxsQBIJw4PKk=
+github.com/ulikunitz/xz v0.5.10/go.mod h1:nbz6k7qbPmH4IRqmfOplQw/tblSgqTqBwxkY0oWt/14=
-github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
+github.com/urfave/cli/v2 v2.3.0 h1:qph92Y649prgesehzOrQjdWyxFOp/QVM+6imKHad91M=
-github.com/urfave/cli/v2 v2.23.5 h1:xbrU7tAYviSpqeR3X4nEFWUdB/uDZ6DE+HxmRU7Xtyw=
+github.com/urfave/cli/v2 v2.3.0/go.mod h1:LJmUH05zAU44vOAcrfzZQKsZbVcdbOG8rtL3/XcUArI=
-github.com/urfave/cli/v2 v2.23.5/go.mod h1:GHupkWPMM0M/sj1a2b4wUrWBPzazNrIjouW6fmdJLxc=
-github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 h1:bAn7/zixMGCfxrRTfdpNzjtPYqr8smhKouy9mxVdGPU=
-github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673/go.mod h1:N3UwUGtsrSj3ccvlPHLoLsHnpR27oXr4ZE984MbSER8=
 github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
-github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
-go.uber.org/atomic v1.10.0 h1:9qC72Qh0+3MqyJbAn8YU5xVq1frD8bn3JtD2oXtafVQ=
+go.uber.org/atomic v1.9.0 h1:ECmE8Bn/WFTYwEW/bpKD3M8VtR/zQVbavAoalC1PYyE=
-go.uber.org/atomic v1.10.0/go.mod h1:LUxbIzbOniOlMKjJjyPfpl4v+PKK2cNJn91OQbhoJI0=
+go.uber.org/atomic v1.9.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
-go.uber.org/goleak v1.1.11 h1:wy28qYRKZgnJTxGxvye5/wgWr1EKjmUDGYox5mGlRlI=
+go.uber.org/goleak v1.1.11-0.20210813005559-691160354723 h1:sHOAIxRGBp443oHZIPB+HsUGaksVCXVQENPxwTfQdH4=
-go.uber.org/goleak v1.1.11/go.mod h1:cwTWslyiVhfpKIDGSZEM2HlOvcqm+tG4zioyIeLoqMQ=
+go.uber.org/goleak v1.1.11-0.20210813005559-691160354723/go.mod h1:cwTWslyiVhfpKIDGSZEM2HlOvcqm+tG4zioyIeLoqMQ=
 go.uber.org/multierr v1.6.0/go.mod h1:cdWPpRnG4AhwMwsgIHip0KRBQjJy5kYEpYjJxpXp9iU=
-go.uber.org/multierr v1.8.0 h1:dg6GjLku4EH+249NNmoIciG9N/jURbDG+pFlTkhzIC8=
+go.uber.org/multierr v1.7.0 h1:zaiO/rmgFjbmCXdSYJWQcdvOCsthmdaHfr3Gm2Kx4Ec=
-go.uber.org/multierr v1.8.0/go.mod h1:7EAYxJLBy9rStEaz58O2t4Uvip6FSURkq8/ppBp95ak=
+go.uber.org/multierr v1.7.0/go.mod h1:7EAYxJLBy9rStEaz58O2t4Uvip6FSURkq8/ppBp95ak=
-go.uber.org/zap v1.23.0 h1:OjGQ5KQDEUawVHxNwQgPpiypGHOxo2mNZsOqTak4fFY=
+go.uber.org/zap v1.19.1 h1:ue41HOKd1vGURxrmeKIgELGb3jPW9DMUDGtsinblHwI=
-go.uber.org/zap v1.23.0/go.mod h1:D+nX8jyLsMHMYrln8A0rJjFt/T/9/bGgIhAqxv5URuY=
+go.uber.org/zap v1.19.1/go.mod h1:j3DNczoxDZroyBnOT1L/Q79cfUMGZxlv/9dzN7SM1rI=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550 h1:ObdrDkeb4kJdCP557AjRjq69pTHfNouLtWZG7j9rPN8=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
-golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
-golang.org/x/crypto v0.3.0 h1:a06MkbcxBrEFc0w0QIZWXrH/9cCX6KJyWbBOIwAn+7A=
-golang.org/x/crypto v0.3.0/go.mod h1:hebNnKkNXi2UzZN1eVRvBB7co0a+JxK6XbPiWVs/3J4=
 golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
 golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
-golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
-golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
-golang.org/x/net v0.2.0/go.mod h1:KqCZLdyyvdV855qA2rE3GC2aiw5xGR5TEjj8smXukLY=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
-golang.org/x/term v0.2.0/go.mod h1:TVmDHMZPmdnySmBfhjOoOdhjzdE1h4u1VwSiw2l1Nuc=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
-golang.org/x/text v0.4.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.1.5/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
-golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
 gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
-gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/logging/logging.go

@@ -0,0 +1,41 @@
+package logging
+
+import (
+	"os"
+	"sync"
+	"time"
+)
+
+import (
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+// newDefaultProductionLog configures a custom log that is
+// intended for use by default if no other log is specified
+// in a config. It writes to stderr, uses the console encoder,
+// and enables INFO-level logs and higher.
+func newDefaultProductionLog() *zap.Logger {
+	encCfg := zap.NewProductionEncoderConfig()
+	// if interactive terminal, make output more human-readable by default
+	encCfg.EncodeTime = func(ts time.Time, encoder zapcore.PrimitiveArrayEncoder) {
+		encoder.AppendString(ts.Format("2006/01/02 15:04:05.000"))
+	}
+	encCfg.EncodeLevel = zapcore.CapitalColorLevelEncoder
+	enc := zapcore.NewConsoleEncoder(encCfg)
+	core := zapcore.NewCore(enc, zapcore.Lock(os.Stdout), zap.NewAtomicLevelAt(zap.DebugLevel))
+	return zap.New(core)
+
+}
+
+// Log returns the current default logger.
+func Log() *zap.Logger {
+	defaultLoggerMu.RLock()
+	defer defaultLoggerMu.RUnlock()
+	return defaultLogger
+}
+
+var (
+	defaultLogger   = newDefaultProductionLog()
+	defaultLoggerMu sync.RWMutex
+)

internal/logging/zap.go

@@ -1,13 +0,0 @@
-package logging
-
-import (
-	"go.uber.org/zap"
-	"go.uber.org/zap/zapcore"
-)
-
-func NewZapLogger() (*zap.Logger, error) {
-	zapCfg := zap.NewDevelopmentConfig()
-	zapCfg.EncoderConfig.EncodeLevel = zapcore.CapitalColorLevelEncoder
-	zapCfg.EncoderConfig.EncodeTime = zapcore.TimeEncoderOfLayout("2006/01/02 15:04:05.000")
-	return zapCfg.Build()
-}

internal/utils/crypto.go

@@ -8,7 +8,7 @@ func PKCS7UnPadding(encrypt []byte) []byte {
 	return encrypt[:(length - unPadding)]
 }
 
-func DecryptAES128ECB(data, key []byte) []byte {
+func DecryptAes128Ecb(data, key []byte) []byte {
 	cipher, _ := aes.NewCipher(key)
 	decrypted := make([]byte, len(data))
 	size := 16