50 lines
1.3 KiB
Go
50 lines
1.3 KiB
Go
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package envelope
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import (
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"github.com/ipfs/go-cid"
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"github.com/ipld/go-ipld-prime"
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"github.com/ipld/go-ipld-prime/codec/dagcbor"
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"github.com/libp2p/go-libp2p/core/crypto"
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"github.com/multiformats/go-multibase"
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"github.com/multiformats/go-multicodec"
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"github.com/multiformats/go-multihash"
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)
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var b58BTCEnc = multibase.MustNewEncoder(multibase.Base58BTC)
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// CIDToBase56BTC is a utility method to convert a CIDv1 to the canonical
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// string representation used by UCAN.
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func CIDToBase58BTC(id cid.Cid) string {
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return id.Encode(b58BTCEnc)
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}
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// CID returns the UCAN content identifier a Tokener.
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func CID(privKey crypto.PrivKey, token Tokener) (cid.Cid, error) {
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data, err := ToDagCbor(privKey, token)
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if err != nil {
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return cid.Undef, err
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}
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return CIDFromBytes(data)
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}
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// CIDFromBytes returns the UCAN content identifier for an arbitrary slice
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// of bytes.
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func CIDFromBytes(b []byte) (cid.Cid, error) {
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return cid.V1Builder{
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Codec: uint64(multicodec.DagCbor),
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MhType: multihash.SHA2_256,
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MhLength: 0,
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}.Sum(b)
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}
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// CIDFromIPLD returns the UCAN content identifier for an ipld.Node.
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func CIDFromIPLD(node ipld.Node) (cid.Cid, error) {
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data, err := ipld.Encode(node, dagcbor.Encode)
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if err != nil {
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return cid.Undef, nil
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}
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return CIDFromBytes(data)
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}
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