141 lines
3.0 KiB
Go
141 lines
3.0 KiB
Go
package container
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import (
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"encoding/base64"
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"errors"
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"fmt"
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"io"
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"iter"
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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/ucan-wg/go-ucan/token"
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"github.com/ucan-wg/go-ucan/token/delegation"
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"github.com/ucan-wg/go-ucan/token/invocation"
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)
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var ErrNotFound = fmt.Errorf("not found")
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// Reader is a token container reader. It exposes the tokens conveniently decoded.
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type Reader map[cid.Cid]token.Token
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// GetToken returns an arbitrary decoded token, from its CID.
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// If not found, ErrNotFound is returned.
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func (ctn Reader) GetToken(cid cid.Cid) (token.Token, error) {
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tkn, ok := ctn[cid]
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if !ok {
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return nil, ErrNotFound
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}
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return tkn, nil
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}
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// GetDelegation is the same as GetToken but only return a delegation.Token, with the right type.
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func (ctn Reader) GetDelegation(cid cid.Cid) (*delegation.Token, error) {
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tkn, err := ctn.GetToken(cid)
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if errors.Is(err, ErrNotFound) {
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return nil, delegation.ErrDelegationNotFound
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}
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if err != nil {
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return nil, err
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}
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if tkn, ok := tkn.(*delegation.Token); ok {
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return tkn, nil
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}
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return nil, delegation.ErrDelegationNotFound
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}
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// GetAllDelegations returns all the delegation.Token in the container.
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func (ctn Reader) GetAllDelegations() iter.Seq2[cid.Cid, *delegation.Token] {
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return func(yield func(cid.Cid, *delegation.Token) bool) {
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for c, t := range ctn {
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if t, ok := t.(*delegation.Token); ok {
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if !yield(c, t) {
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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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}
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// GetInvocation returns the first found invocation.Token.
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// If none are found, ErrNotFound is returned.
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func (ctn Reader) GetInvocation() (*invocation.Token, error) {
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for _, t := range ctn {
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if inv, ok := t.(*invocation.Token); ok {
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return inv, nil
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}
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}
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return nil, ErrNotFound
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}
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func FromCar(r io.Reader) (Reader, error) {
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_, it, err := readCar(r)
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if err != nil {
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return nil, err
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}
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ctn := make(Reader)
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for block, err := range it {
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if err != nil {
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return nil, err
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}
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err = ctn.addToken(block.data)
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if err != nil {
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return nil, err
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}
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}
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return ctn, nil
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}
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func FromCarBase64(r io.Reader) (Reader, error) {
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return FromCar(base64.NewDecoder(base64.StdEncoding, r))
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}
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func FromCbor(r io.Reader) (Reader, error) {
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n, err := ipld.DecodeStreaming(r, dagcbor.Decode)
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if err != nil {
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return nil, err
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}
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if n.Kind() != datamodel.Kind_List {
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return nil, fmt.Errorf("not a list")
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}
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ctn := make(Reader, n.Length())
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it := n.ListIterator()
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for !it.Done() {
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_, val, err := it.Next()
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if err != nil {
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return nil, err
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}
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data, err := val.AsBytes()
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if err != nil {
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return nil, err
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}
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err = ctn.addToken(data)
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if err != nil {
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return nil, err
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}
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}
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return ctn, nil
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}
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func FromCborBase64(r io.Reader) (Reader, error) {
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return FromCbor(base64.NewDecoder(base64.StdEncoding, r))
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}
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func (ctn Reader) addToken(data []byte) error {
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tkn, c, err := token.FromSealed(data)
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if err != nil {
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return err
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}
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ctn[c] = tkn
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return nil
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}
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