126 lines
3.3 KiB
Go
126 lines
3.3 KiB
Go
package token
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
|
|
"github.com/ipfs/go-cid"
|
|
"github.com/ipld/go-ipld-prime"
|
|
"github.com/ipld/go-ipld-prime/codec"
|
|
"github.com/ipld/go-ipld-prime/codec/dagcbor"
|
|
"github.com/ipld/go-ipld-prime/codec/dagjson"
|
|
"github.com/ipld/go-ipld-prime/datamodel"
|
|
|
|
"github.com/ucan-wg/go-ucan/token/delegation"
|
|
"github.com/ucan-wg/go-ucan/token/internal/envelope"
|
|
"github.com/ucan-wg/go-ucan/token/invocation"
|
|
)
|
|
|
|
// FromSealed decodes an arbitrary token type from the binary data,
|
|
// verifies that the envelope's signature is correct based on the public
|
|
// key taken from the issuer (iss) field and calculates the CID of the
|
|
// incoming data.
|
|
// Supported and returned types are:
|
|
// - delegation.Token
|
|
// - invocation.Token
|
|
func FromSealed(data []byte) (Token, cid.Cid, error) {
|
|
tkn, err := FromDagCbor(data)
|
|
if err != nil {
|
|
return nil, cid.Undef, err
|
|
}
|
|
|
|
id, err := envelope.CIDFromBytes(data)
|
|
if err != nil {
|
|
return nil, cid.Undef, err
|
|
}
|
|
|
|
return tkn, id, nil
|
|
}
|
|
|
|
// FromSealedReader is the same as Unseal but accepts an io.Reader.
|
|
func FromSealedReader(r io.Reader) (Token, cid.Cid, error) {
|
|
cidReader := envelope.NewCIDReader(r)
|
|
|
|
tkn, err := FromDagCborReader(cidReader)
|
|
if err != nil {
|
|
return nil, cid.Undef, err
|
|
}
|
|
|
|
id, err := cidReader.CID()
|
|
if err != nil {
|
|
return nil, cid.Undef, err
|
|
}
|
|
|
|
return tkn, id, nil
|
|
}
|
|
|
|
// Decode unmarshals the input data using the format specified by the
|
|
// provided codec.Decoder into an arbitrary UCAN token.
|
|
// An error is returned if the conversion fails, or if the resulting
|
|
// Token is invalid.
|
|
// Supported and returned types are:
|
|
// - delegation.Token
|
|
// - invocation.Token
|
|
func Decode(b []byte, decFn codec.Decoder) (Token, error) {
|
|
node, err := ipld.Decode(b, decFn)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return fromIPLD(node)
|
|
}
|
|
|
|
// DecodeReader is the same as Decode, but accept an io.Reader.
|
|
func DecodeReader(r io.Reader, decFn codec.Decoder) (Token, error) {
|
|
node, err := ipld.DecodeStreaming(r, decFn)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return fromIPLD(node)
|
|
}
|
|
|
|
// FromDagCbor unmarshals an arbitrary DagCbor encoded UCAN token.
|
|
// An error is returned if the conversion fails, or if the resulting
|
|
// Token is invalid.
|
|
// Supported and returned types are:
|
|
// - delegation.Token
|
|
// - invocation.Token
|
|
func FromDagCbor(b []byte) (Token, error) {
|
|
return Decode(b, dagcbor.Decode)
|
|
}
|
|
|
|
// FromDagCborReader is the same as FromDagCbor, but accept an io.Reader.
|
|
func FromDagCborReader(r io.Reader) (Token, error) {
|
|
return DecodeReader(r, dagcbor.Decode)
|
|
}
|
|
|
|
// FromDagCbor unmarshals an arbitrary DagJson encoded UCAN token.
|
|
// An error is returned if the conversion fails, or if the resulting
|
|
// Token is invalid.
|
|
// Supported and returned types are:
|
|
// - delegation.Token
|
|
// - invocation.Token
|
|
func FromDagJson(b []byte) (Token, error) {
|
|
return Decode(b, dagjson.Decode)
|
|
}
|
|
|
|
// FromDagJsonReader is the same as FromDagJson, but accept an io.Reader.
|
|
func FromDagJsonReader(r io.Reader) (Token, error) {
|
|
return DecodeReader(r, dagjson.Decode)
|
|
}
|
|
|
|
func fromIPLD(node datamodel.Node) (Token, error) {
|
|
tag, err := envelope.FindTag(node)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
switch tag {
|
|
case delegation.Tag:
|
|
return delegation.FromIPLD(node)
|
|
case invocation.Tag:
|
|
return invocation.FromIPLD(node)
|
|
default:
|
|
return nil, fmt.Errorf(`unknown tag "%s"`, tag)
|
|
}
|
|
}
|