invocation: add support for self-signed invocations (issuer=subject)

Author: MichaelMure

token/delegation/delegation.go

@@ -238,7 +238,7 @@ func tokenFromModel(m tokenPayloadModel) (*Token, error) {
 
 	tkn.issuer, err = did.Parse(m.Iss)
 	if err != nil {
-		return nil, fmt.Errorf("parse iss: %w", err)
+		return nil, fmt.Errorf("parse issuer: %w", err)
 	}
 
 	if tkn.audience, err = did.Parse(m.Aud); err != nil {

token/delegation/delegationtest/data/TokenAliceAlice.dagcbor

@@ -71,6 +71,25 @@ type generator struct {
 	chains []proof
 }
 
+func (g *generator) createSelfDelegations(personas []didtest.Persona) error {
+	for _, persona := range personas {
+		_, err := g.createDelegation(newDelegationParams{
+			privKey: persona.PrivKey(),
+			aud:     persona.DID(),
+			cmd:     delegationtest.NominalCommand,
+			pol:     policytest.EmptyPolicy,
+			sub:     didtest.PersonaAlice.DID(),
+			opts: []delegation.Option{
+				delegation.WithNonce(constantNonce),
+			},
+		}, persona.Name()+persona.Name(), noopVariant())
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 func (g *generator) chainPersonas(personas []didtest.Persona, acc acc, vari variant) error {
 	acc.name += personas[0].Name()
 

token/delegation/delegationtest/data/TokenBobBob.dagcbor

@@ -6,7 +6,11 @@ import (
 
 func main() {
 	gen := &generator{}
-	err := gen.chainPersonas(didtest.Personas(), acc{}, noopVariant())
+	err := gen.createSelfDelegations(didtest.Personas())
+	if err != nil {
+		panic(err)
+	}
+	err = gen.chainPersonas(didtest.Personas(), acc{}, noopVariant())
 	if err != nil {
 		panic(err)
 	}