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Attempt to preserve base of Cid's provided on the command line.
License: MIT Signed-off-by: Kevin Atkinson <k@kevina.org>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| package cidenc | ||
|
|
||
| import ( | ||
| cid "gx/ipfs/QmPSQnBKM9g7BaUcZCvswUJVscQ1ipjmwxN5PXCjkp9EQ7/go-cid" | ||
| path "gx/ipfs/QmX7uSbkNz76yNwBhuwYwRbhihLnJqM73VTCjS3UMJud9A/go-path" | ||
| mbase "gx/ipfs/QmekxXDhCxCJRNuzmHreuaT3BsuJcsjcXWNrtV9C8DRHtd/go-multibase" | ||
| ) | ||
|
|
||
| // Encoder is a type used to encode or recode Cid as the user | ||
| // specifies | ||
| type Interface interface { | ||
| Encode(c cid.Cid) string | ||
| Recode(v string) (string, error) | ||
| } | ||
|
|
||
| // Basic is a basic Encoder that will encode Cid's using | ||
| // a specifed base, optionally upgrading a Cid if is Version 0 | ||
| type Encoder struct { | ||
| Base mbase.Encoder | ||
| Upgrade bool | ||
| } | ||
|
|
||
| var Default = Encoder{ | ||
| Base: mbase.MustNewEncoder(mbase.Base58BTC), | ||
| Upgrade: false, | ||
| } | ||
|
|
||
| func (enc Encoder) Encode(c cid.Cid) string { | ||
| if enc.Upgrade && c.Version() == 0 { | ||
| c = cid.NewCidV1(c.Type(), c.Hash()) | ||
| } | ||
| return c.Encode(enc.Base) | ||
| } | ||
|
|
||
| func (enc Encoder) Recode(v string) (string, error) { | ||
| skip, err := enc.NoopRecode(v) | ||
| if skip || err != nil { | ||
| return v, err | ||
| } | ||
|
|
||
| c, err := cid.Decode(v) | ||
| if err != nil { | ||
| return v, err | ||
| } | ||
|
|
||
| return enc.Encode(c), nil | ||
| } | ||
|
|
||
| func (enc Encoder) NoopRecode(v string) (bool, error) { | ||
| if len(v) < 2 { | ||
| return false, cid.ErrCidTooShort | ||
| } | ||
| ver := cidVer(v) | ||
| skip := ver == 0 && !enc.Upgrade || ver == 1 && v[0] == byte(enc.Base.Encoding()) | ||
| return skip, nil | ||
| } | ||
|
|
||
| func cidVer(v string) int { | ||
| if len(v) == 46 && v[:2] == "Qm" { | ||
| return 0 | ||
| } else { | ||
| return 1 | ||
| } | ||
| } | ||
|
|
||
| // On error an unmodified encoder will be returned so it is safe to | ||
| // ignore the error | ||
| func (enc Encoder) FromPath(p string) (Encoder, error) { | ||
| v := extractCidString(p) | ||
| if cidVer(v) == 0 { | ||
| return Encoder{enc.Base, false}, nil | ||
| } | ||
| e, err := mbase.NewEncoder(mbase.Encoding(v[0])) | ||
| if err != nil { | ||
| return enc, err | ||
| } | ||
| return Encoder{e, true}, nil | ||
| } | ||
|
|
||
| func extractCidString(p string) string { | ||
| segs := path.FromString(p).Segments() | ||
| v := segs[0] | ||
| if v == "ipfs" && len(segs) > 0 { | ||
| v = segs[1] | ||
| } | ||
| return v | ||
| } | ||
|
|
||
| type WithOverride struct { | ||
| base Encoder | ||
| override map[cid.Cid]string | ||
| } | ||
|
|
||
| func (enc Encoder) WithOverride(cids ...string) Interface { | ||
| override := map[cid.Cid]string{} | ||
| for _, p := range cids { | ||
| v := p | ||
| skip, err := enc.NoopRecode(v) | ||
| if skip || err != nil { | ||
| continue | ||
| } | ||
| c, err := cid.Decode(v) | ||
| if err != nil { | ||
| continue | ||
| } | ||
| override[c] = v | ||
| } | ||
| if len(override) == 0 { | ||
| return enc | ||
| } | ||
| return WithOverride{enc, override} | ||
| } | ||
|
|
||
| func (enc WithOverride) Encode(c cid.Cid) string { | ||
| v, ok := enc.override[c] | ||
| if ok { | ||
| return v | ||
| } | ||
| return enc.base.Encode(c) | ||
| } | ||
|
|
||
| func (enc WithOverride) Recode(v string) (string, error) { | ||
| c, err := cid.Decode(v) | ||
| if err != nil { | ||
| return v, err | ||
| } | ||
|
|
||
| return enc.Encode(c), nil | ||
| } |
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