66 lines
1.7 KiB
Go
66 lines
1.7 KiB
Go
package container
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import (
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"encoding/base64"
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"io"
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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/ipld/go-ipld-prime/datamodel"
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"github.com/ipld/go-ipld-prime/fluent/qp"
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"github.com/ipld/go-ipld-prime/node/basicnode"
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)
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// TODO: should we have a multibase to wrap the cbor? but there is no reader/write in go-multibase :-(
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const currentContainerVersion = "ctn-v1"
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// Writer is a token container writer. It provides a convenient way to aggregate and serialize tokens together.
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type Writer map[cid.Cid][]byte
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func NewWriter() Writer {
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return make(Writer)
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}
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// AddSealed includes a "sealed" token (serialized with a ToSealed* function) in the container.
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func (ctn Writer) AddSealed(cid cid.Cid, data []byte) {
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ctn[cid] = data
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}
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func (ctn Writer) ToCar(w io.Writer) error {
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return writeCar(w, nil, func(yield func(carBlock, error) bool) {
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for c, bytes := range ctn {
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if !yield(carBlock{c: c, data: bytes}, nil) {
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return
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}
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}
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})
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}
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func (ctn Writer) ToCarBase64(w io.Writer) error {
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w2 := base64.NewEncoder(base64.StdEncoding, w)
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defer w2.Close()
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return ctn.ToCar(w2)
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}
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func (ctn Writer) ToCbor(w io.Writer) error {
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node, err := qp.BuildMap(basicnode.Prototype.Any, 1, func(ma datamodel.MapAssembler) {
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qp.MapEntry(ma, currentContainerVersion, qp.List(int64(len(ctn)), func(la datamodel.ListAssembler) {
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for _, bytes := range ctn {
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qp.ListEntry(la, qp.Bytes(bytes))
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}
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}))
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})
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if err != nil {
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return err
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}
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return ipld.EncodeStreaming(w, node, dagcbor.Encode)
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}
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func (ctn Writer) ToCborBase64(w io.Writer) error {
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w2 := base64.NewEncoder(base64.StdEncoding, w)
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defer w2.Close()
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return ctn.ToCbor(w2)
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}
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