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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| package pool | ||
|
|
||
| import ( | ||
| "encoding/base64" | ||
| "errors" | ||
| "fmt" | ||
| "regexp" | ||
|
|
||
| "github.com/FloatTech/floatbox/binary" | ||
| ) | ||
|
|
||
| const ( | ||
| ntcacheurlprefix = "https://multimedia.nt.qq.com.cn/download?appid=1407&fileid=" | ||
| ntcacheurl = ntcacheurlprefix + "%s&spec=0&rkey=%s" | ||
| ntappidlen = 60 | ||
| ntrkeylen = 46 | ||
| ntrawlen = ntappidlen + ntrkeylen | ||
| ) | ||
|
|
||
| var ntcachere = regexp.MustCompile(`^https://multimedia.nt.qq.com.cn/download\?appid=1407&fileid=([0-9a-zA-Z_-]+)&spec=0&rkey=([0-9a-zA-Z_-]+)$`) | ||
|
|
||
| var ( | ||
| ErrInvalidNTURL = errors.New("invalid nt url") | ||
| ErrInvalidNTRaw = errors.New("invalid nt raw") | ||
| ) | ||
|
|
||
| type nturl string | ||
|
|
||
| func unpack(raw string) (nturl, error) { | ||
| if len(raw) != ntrawlen { | ||
| return "", ErrInvalidNTRaw | ||
| } | ||
| rb := binary.StringToBytes(raw) | ||
| b := rb[ntappidlen-1] | ||
| fileid := base64.RawURLEncoding.EncodeToString(rb[:59]) | ||
| if len(fileid) < int(b) { | ||
| return "", ErrInvalidNTRaw | ||
| } | ||
| fileid = fileid[:b] | ||
| rkey := base64.RawURLEncoding.EncodeToString(rb[60:]) | ||
| b = rb[ntrawlen-1] | ||
| if len(rkey) < int(b) { | ||
| return "", ErrInvalidNTRaw | ||
| } | ||
| rkey = rkey[:b] | ||
| return nturl(fmt.Sprintf(ntcacheurl, fileid, rkey)), nil | ||
| } | ||
|
|
||
| // pack url into pool | ||
| func (nu nturl) pack() (string, error) { | ||
| subs := ntcachere.FindStringSubmatch(string(nu)) | ||
| if len(subs) != 3 { | ||
| return "", ErrInvalidNTURL | ||
| } | ||
| var buf [ntrawlen]byte | ||
| fileid := subs[1] | ||
| rkey := subs[2] | ||
| _, err := base64.RawURLEncoding.AppendDecode(buf[:0], binary.StringToBytes(fileid)) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| buf[ntappidlen-1] = byte(len(fileid)) | ||
| _, err = base64.RawURLEncoding.AppendDecode(buf[60:60], binary.StringToBytes(rkey)) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| buf[ntrawlen-1] = byte(len(rkey)) | ||
| return binary.BytesToString(buf[:]), nil | ||
| } | ||
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| package pool | ||
|
|
||
| import ( | ||
| "encoding/hex" | ||
| "fmt" | ||
| "testing" | ||
|
|
||
| "github.com/FloatTech/floatbox/binary" | ||
| ) | ||
|
|
||
| func TestNTPacker(t *testing.T) { | ||
| rkeyb64 := "CAESKBkcro_MGujokpPszCPSJtCwBMcJAkNIEqxA0gVXuTCaxQLbnGx4yk4" | ||
| idb64 := "CgoyNzE1NDM3MTQwEhS2wXeeCxuBUgynUmsZ7oYX2r80ARiO468GIP8KKIGuxu_A7IUDUIC9owE" | ||
| nuurl := nturl(fmt.Sprintf(ntcacheurl, idb64, rkeyb64)) | ||
| t.Log(nuurl) | ||
| raw, err := nuurl.pack() | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| t.Log(hex.EncodeToString(binary.StringToBytes(raw))) | ||
| upknt, err := unpack(raw) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| if upknt != nuurl { | ||
| t.Fatal("expected", nuurl, "but got", upknt) | ||
| } | ||
| } |