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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| package utils | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/hex" | ||
| "fmt" | ||
| "io" | ||
| "strings" | ||
|
|
||
| "github.com/pingcap/errors" | ||
| "github.com/spf13/pflag" | ||
| ) | ||
|
|
||
| // ParseKey parse key by given format | ||
| func ParseKey(flags *pflag.FlagSet, key string) ([]byte, error) { | ||
| switch flags.Lookup("format").Value.String() { | ||
| case "raw": | ||
| return []byte(key), nil | ||
| case "escaped": | ||
| return unescapedKey(key) | ||
| case "hex": | ||
| key, err := hex.DecodeString(key) | ||
| if err != nil { | ||
| return nil, errors.WithStack(err) | ||
| } | ||
| return key, nil | ||
| } | ||
| return nil, errors.New("unknown format") | ||
| } | ||
|
|
||
| func unescapedKey(text string) ([]byte, error) { | ||
| var buf []byte | ||
| r := bytes.NewBuffer([]byte(text)) | ||
| for { | ||
| c, err := r.ReadByte() | ||
| if err != nil { | ||
| if err != io.EOF { | ||
| return nil, errors.WithStack(err) | ||
| } | ||
| break | ||
| } | ||
| if c != '\\' { | ||
| buf = append(buf, c) | ||
| continue | ||
| } | ||
| n := r.Next(1) | ||
| if len(n) == 0 { | ||
| return nil, io.EOF | ||
| } | ||
| // See: https://golang.org/ref/spec#Rune_literals | ||
| if idx := strings.IndexByte(`abfnrtv\'"`, n[0]); idx != -1 { | ||
| buf = append(buf, []byte("\a\b\f\n\r\t\v\\'\"")[idx]) | ||
| continue | ||
| } | ||
|
|
||
| switch n[0] { | ||
| case 'x': | ||
| fmt.Sscanf(string(r.Next(2)), "%02x", &c) | ||
| buf = append(buf, c) | ||
| default: | ||
| n = append(n, r.Next(2)...) | ||
| _, err := fmt.Sscanf(string(n), "%03o", &c) | ||
| if err != nil { | ||
| return nil, errors.WithStack(err) | ||
| } | ||
| buf = append(buf, c) | ||
| } | ||
| } | ||
| return buf, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,41 @@ | ||
| package utils | ||
|
|
||
| import ( | ||
| "encoding/hex" | ||
|
|
||
| . "github.com/pingcap/check" | ||
| "github.com/spf13/pflag" | ||
| ) | ||
|
|
||
| type testKeySuite struct{} | ||
|
|
||
| var _ = Suite(&testKeySuite{}) | ||
|
|
||
| func (r *testKeySuite) TestParseKey(c *C) { | ||
| flagSet := &pflag.FlagSet{} | ||
| flagSet.String("format", "raw", "") | ||
| rawKey := "1234" | ||
| parsedKey, err := ParseKey(flagSet, rawKey) | ||
| c.Assert(err, IsNil) | ||
| c.Assert(parsedKey, BytesEquals, []byte(rawKey)) | ||
|
|
||
| flagSet = &pflag.FlagSet{} | ||
| flagSet.String("format", "escaped", "") | ||
| escapedKey := "\\a\\x1" | ||
| parsedKey, err = ParseKey(flagSet, escapedKey) | ||
| c.Assert(err, IsNil) | ||
| c.Assert(parsedKey, BytesEquals, []byte("\a\x01")) | ||
|
|
||
| flagSet = &pflag.FlagSet{} | ||
| flagSet.String("format", "hex", "") | ||
| hexKey := hex.EncodeToString([]byte("1234")) | ||
| parsedKey, err = ParseKey(flagSet, hexKey) | ||
| c.Assert(err, IsNil) | ||
| c.Assert(parsedKey, BytesEquals, []byte("1234")) | ||
|
|
||
| flagSet = &pflag.FlagSet{} | ||
| flagSet.String("format", "notSupport", "") | ||
| _, err = ParseKey(flagSet, rawKey) | ||
| c.Assert(err, ErrorMatches, "*unknown format*") | ||
|
|
||
| } |