client: follow go-ucan changes, improvements, example

toolkit/client/client_test.go

@@ -0,0 +1,76 @@
+package client
+
+import (
+	"context"
+	"fmt"
+	"iter"
+	"time"
+
+	"github.com/ucan-wg/go-ucan/did"
+	"github.com/ucan-wg/go-ucan/did/didtest"
+	"github.com/ucan-wg/go-ucan/pkg/command"
+	"github.com/ucan-wg/go-ucan/pkg/policy"
+	"github.com/ucan-wg/go-ucan/token/delegation"
+	"github.com/ucan-wg/go-ucan/token/invocation"
+)
+
+func ExampleNewClient() {
+	servicePersona := didtest.PersonaAlice
+	clientPersona := didtest.PersonaBob
+
+	// requester is an adaptor for a real world issuer, we use a mock in that example
+	requester := &requesterMock{persona: servicePersona}
+
+	client, err := NewClient(clientPersona.PrivKey(), requester)
+	handleError(err)
+
+	cont, err := client.PrepareInvoke(
+		context.Background(),
+		command.New("crud", "add"),
+		servicePersona.DID(),
+		// extra invocation parameters:
+		invocation.WithExpirationIn(10*time.Minute),
+		invocation.WithArgument("foo", "bar"),
+		invocation.WithMeta("baz", 1234),
+	)
+	handleError(err)
+
+	// this container holds the invocation and all the delegation proofs
+	b64, err := cont.ToCborBase64()
+	handleError(err)
+
+	fmt.Println(string(b64))
+}
+
+func handleError(err error) {
+	if err != nil {
+		panic(err)
+	}
+}
+
+type requesterMock struct {
+	persona didtest.Persona
+}
+
+func (r requesterMock) RequestDelegation(_ context.Context, audience did.DID, cmd command.Command, _ did.DID) (iter.Seq2[*delegation.Bundle, error], error) {
+	// the mock issue whatever the client asks:
+	dlg, err := delegation.Root(r.persona.DID(), audience, cmd, policy.Policy{})
+	if err != nil {
+		return nil, err
+	}
+
+	dlgBytes, dlgCid, err := dlg.ToSealed(r.persona.PrivKey())
+	if err != nil {
+		return nil, err
+	}
+
+	bundle := &delegation.Bundle{
+		Cid:     dlgCid,
+		Decoded: dlg,
+		Sealed:  dlgBytes,
+	}
+
+	return func(yield func(*delegation.Bundle, error) bool) {
+		yield(bundle, nil)
+	}, nil
+}