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Add IPFS Gateway HTTP transport metadata as a well-known multicodec
Add SDK to aid parsing IPNI metadata that represents IPFS Gateway HTTP transport protocol. Relates to: - multiformats/multicodec#321 Fixes #21
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| package metadata | ||
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| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "io" | ||
|
|
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| "github.com/multiformats/go-multicodec" | ||
| "github.com/multiformats/go-varint" | ||
| ) | ||
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| var ( | ||
| ipfsGatewayHttpBytes = append(varint.ToUvarint(uint64(multicodec.TransportIpfsGatewayHttp)), ipfsGatewayHttpPayloadLenBytes...) | ||
| ipfsGatewayHttpPayloadLenBytes = varint.ToUvarint(0) | ||
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| _ Protocol = (*IpfsGatewayHttp)(nil) | ||
| ) | ||
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| // IpfsGatewayHttp represents the indexing metadata that uses multicodec.TransportIpfsGatewayHttp. | ||
| type IpfsGatewayHttp struct { | ||
| } | ||
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| func (b IpfsGatewayHttp) ID() multicodec.Code { | ||
| return multicodec.TransportIpfsGatewayHttp | ||
| } | ||
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| func (b IpfsGatewayHttp) MarshalBinary() ([]byte, error) { | ||
| return ipfsGatewayHttpBytes, nil | ||
| } | ||
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| func (b IpfsGatewayHttp) UnmarshalBinary(data []byte) error { | ||
| if !bytes.Equal(data, ipfsGatewayHttpBytes) { | ||
| return fmt.Errorf("transport ID does not match %s", multicodec.TransportIpfsGatewayHttp) | ||
| } | ||
| return nil | ||
| } | ||
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| func (b IpfsGatewayHttp) ReadFrom(r io.Reader) (n int64, err error) { | ||
| wantLen := len(ipfsGatewayHttpBytes) | ||
| buf := make([]byte, wantLen) | ||
| read, err := r.Read(buf) | ||
| bRead := int64(read) | ||
| if err != nil { | ||
| return bRead, err | ||
| } | ||
| if wantLen != read { | ||
| return bRead, fmt.Errorf("expected %d readable bytes but read %d", wantLen, read) | ||
| } | ||
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| if !bytes.Equal(ipfsGatewayHttpBytes, buf) { | ||
| return bRead, fmt.Errorf("transport ID does not match %s", multicodec.TransportIpfsGatewayHttp) | ||
| } | ||
| return bRead, nil | ||
| } |
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