Updated auth interface (#1384)

* Updated  auth interface

* Add Rule

* Remove Rule

* Return token from Renew

* Renew => Refresh

* Implement Tokens & Default Auth Implementation

* Change default auth to noop

* Change default auth to noop

* Move token.Token to auth.Token

* Remove Token from Account

* Auth service implementation

* Decode JWT locally

* Cookie for secret

* Move string to bottom of interface definition

* Depricate auth_exclude

* Update auth wrappers

* Update go.sum

Co-authored-by: Ben Toogood <ben@micro.mu>

auth/token/basic/basic.go

@@ -0,0 +1,95 @@
+package basic
+
+import (
+	"encoding/json"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/micro/go-micro/v2/auth"
+	"github.com/micro/go-micro/v2/auth/token"
+	"github.com/micro/go-micro/v2/store"
+)
+
+// Basic implementation of token provider, backed by the store
+type Basic struct {
+	store store.Store
+}
+
+// NewTokenProvider returns an initialized basic provider
+func NewTokenProvider(opts ...token.Option) token.Provider {
+	options := token.NewOptions(opts...)
+
+	if options.Store == nil {
+		options.Store = store.DefaultStore
+	}
+
+	return &Basic{
+		store: options.Store,
+	}
+}
+
+// Generate a token for an account
+func (b *Basic) Generate(subject string, opts ...token.GenerateOption) (*auth.Token, error) {
+	options := token.NewGenerateOptions(opts...)
+
+	// construct the token
+	token := auth.Token{
+		Subject:  subject,
+		Type:     b.String(),
+		Token:    uuid.New().String(),
+		Created:  time.Now(),
+		Expiry:   time.Now().Add(options.Expiry),
+		Metadata: options.Metadata,
+		Roles:    options.Roles,
+	}
+
+	// marshal the account to bytes
+	bytes, err := json.Marshal(token)
+	if err != nil {
+		return nil, err
+	}
+
+	// write to the store
+	err = b.store.Write(&store.Record{
+		Key:    token.Token,
+		Value:  bytes,
+		Expiry: options.Expiry,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	// return the token
+	return &token, nil
+}
+
+// Inspect a token
+func (b *Basic) Inspect(t string) (*auth.Token, error) {
+	// lookup the token in the store
+	recs, err := b.store.Read(t)
+	if err == store.ErrNotFound {
+		return nil, token.ErrInvalidToken
+	} else if err != nil {
+		return nil, err
+	}
+	bytes := recs[0].Value
+
+	// unmarshal the bytes
+	var tok *auth.Token
+	if err := json.Unmarshal(bytes, &tok); err != nil {
+		return nil, err
+	}
+
+	// ensure the token hasn't expired, the store should
+	// expire the token but we're checking again
+	if tok.Expiry.Unix() < time.Now().Unix() {
+		return nil, token.ErrInvalidToken
+	}
+
+	return tok, err
+}
+
+// String returns basic
+func (b *Basic) String() string {
+	return "basic"
+}