Auth Provider (#1309)

* auth provider mock interface

* Auth Provider Options

* Implement API Server Auth Package

* Add weh utils

* Add Login URL

* Auth Provider Options

* Add auth provider scope and setting token in cookie

* Remove auth_login_url flag

Co-authored-by: Asim Aslam <asim@aslam.me>
Co-authored-by: Ben Toogood <ben@micro.mu>

auth/options.go

@@ -1,5 +1,7 @@
 package auth
 
+import "github.com/micro/go-micro/v2/auth/provider"
+
 type Options struct {
 	// Token is an auth token
 	Token string
@@ -9,6 +11,10 @@ type Options struct {
 	PrivateKey string
 	// Endpoints to exclude
 	Exclude []string
+	// Provider is an auth provider
+	Provider provider.Provider
+	// LoginURL is the relative url path where a user can login
+	LoginURL string
 }
 
 type Option func(o *Options)
@@ -41,6 +47,20 @@ func Token(t string) Option {
 	}
 }
 
+// Provider set the auth provider
+func Provider(p provider.Provider) Option {
+	return func(o *Options) {
+		o.Provider = p
+	}
+}
+
+// LoginURL sets the auth LoginURL
+func LoginURL(url string) Option {
+	return func(o *Options) {
+		o.LoginURL = url
+	}
+}
+
 type GenerateOptions struct {
 	// Metadata associated with the account
 	Metadata map[string]string