tokens: read arbitrary token

2024-10-01 13:23:37 +02:00
parent a2822f02c7
commit f3a5209cec
6 changed files with 265 additions and 185 deletions
--- a/tokens/inspect.go
+++ b/tokens/inspect.go
@@ -1,105 +1,90 @@
 package tokens

-import (
-	"errors"
-	"fmt"
-	"strings"
-
-	"github.com/ipld/go-ipld-prime"
-	"github.com/ipld/go-ipld-prime/codec"
-	"github.com/ipld/go-ipld-prime/codec/cbor"
-	"github.com/ipld/go-ipld-prime/codec/dagcbor"
-	"github.com/ipld/go-ipld-prime/codec/dagjson"
-	"github.com/ipld/go-ipld-prime/codec/json"
-	"github.com/ipld/go-ipld-prime/codec/raw"
-	"github.com/ipld/go-ipld-prime/datamodel"
-	"github.com/ucan-wg/go-ucan/tokens/internal/envelope"
-)
-
-// EnvelopeInfo describes the fields of an Envelope enclosing a UCAN token.
-type EnvelopeInfo struct {
-	Signature    []byte
-	Tag          string
-	VarsigHeader []byte
-}
-
-// InspectEnvelope accepts arbitrary data and attempts to decode it as a
-// UCAN token's Envelope.
-func Inspect(data []byte) (EnvelopeInfo, error) {
-	undef := EnvelopeInfo{}
-
-	node, err := decodeAny(data)
-	if err != nil {
-		return undef, err
-	}
-
-	info, err := envelope.Inspect(node)
-	if err != nil {
-		return undef, err
-	}
-
-	iterator := info.SigPayloadNode.MapIterator()
-	foundVarsigHeader := false
-	foundTokenPayload := false
-	tag := ""
-	i := 0
-
-	for !iterator.Done() {
-		k, _, err := iterator.Next()
-		if err != nil {
-			return undef, err
-		}
-
-		key, err := k.AsString()
-		if err != nil {
-			return undef, err
-		}
-
-		if key == envelope.VarsigHeaderKey {
-			foundVarsigHeader = true
-			i++
-
-			continue
-		}
-
-		if strings.HasPrefix(key, envelope.UCANTagPrefix) {
-			tag = key
-			foundTokenPayload = true
-			i++
-		}
-	}
-
-	if i != 2 {
-		return undef, fmt.Errorf("expected two and only two fields in SigPayload: %d", i)
-	}
-
-	if !foundVarsigHeader {
-		return undef, errors.New("failed to find VarsigHeader field")
-	}
-
-	if !foundTokenPayload {
-		return undef, errors.New("failed to find TokenPayload field")
-	}
-
-	return EnvelopeInfo{
-		Signature:    info.Signature,
-		Tag:          tag,
-		VarsigHeader: info.VarsigHeader,
-	}, nil
-}
-
-func decodeAny(data []byte) (datamodel.Node, error) {
-	for _, decoder := range []codec.Decoder{
-		dagcbor.Decode,
-		dagjson.Decode,
-		cbor.Decode,
-		json.Decode,
-		raw.Decode,
-	} {
-		if node, err := ipld.Decode(data, decoder); err == nil {
-			return node, nil
-		}
-	}
-
-	return nil, errors.New("failed to decode (any) the provided data")
-}
+//
+// // EnvelopeInfo describes the fields of an Envelope enclosing a UCAN token.
+// type EnvelopeInfo struct {
+// 	Signature    []byte
+// 	Tag          string
+// 	VarsigHeader []byte
+// }
+//
+// // InspectEnvelope accepts arbitrary data and attempts to decode it as a
+// // UCAN token's Envelope.
+// func Inspect(data []byte) (EnvelopeInfo, error) {
+// 	undef := EnvelopeInfo{}
+//
+// 	node, err := decodeAny(data)
+// 	if err != nil {
+// 		return undef, err
+// 	}
+//
+// 	info, err := envelope.inspect(node)
+// 	if err != nil {
+// 		return undef, err
+// 	}
+//
+// 	iterator := info.SigPayloadNode.MapIterator()
+// 	foundVarsigHeader := false
+// 	foundTokenPayload := false
+// 	tag := ""
+// 	i := 0
+//
+// 	for !iterator.Done() {
+// 		k, _, err := iterator.Next()
+// 		if err != nil {
+// 			return undef, err
+// 		}
+//
+// 		key, err := k.AsString()
+// 		if err != nil {
+// 			return undef, err
+// 		}
+//
+// 		if key == envelope.VarsigHeaderKey {
+// 			foundVarsigHeader = true
+// 			i++
+//
+// 			continue
+// 		}
+//
+// 		if strings.HasPrefix(key, envelope.UCANTagPrefix) {
+// 			tag = key
+// 			foundTokenPayload = true
+// 			i++
+// 		}
+// 	}
+//
+// 	if i != 2 {
+// 		return undef, fmt.Errorf("expected two and only two fields in SigPayload: %d", i)
+// 	}
+//
+// 	if !foundVarsigHeader {
+// 		return undef, errors.New("failed to find VarsigHeader field")
+// 	}
+//
+// 	if !foundTokenPayload {
+// 		return undef, errors.New("failed to find TokenPayload field")
+// 	}
+//
+// 	return EnvelopeInfo{
+// 		Signature:    info.Signature,
+// 		Tag:          tag,
+// 		VarsigHeader: info.VarsigHeader,
+// 	}, nil
+// }
+//
+// func decodeAny(data []byte) (datamodel.Node, error) {
+// 	for _, decoder := range []codec.Decoder{
+// 		dagcbor.Decode,
+// 		dagjson.Decode,
+// 		cbor.Decode,
+// 		json.Decode,
+// 		raw.Decode,
+// 	} {
+// 		if node, err := ipld.Decode(data, decoder); err == nil {
+// 			return node, nil
+// 		}
+// 	}
+//
+// 	return nil, errors.New("failed to decode (any) the provided data")
+// }