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/provider/basic/basic.go

@@ -0,0 +1,34 @@
+package basic
+
+import (
+	"github.com/micro/go-micro/v2/auth/provider"
+)
+
+// NewProvider returns an initialised basic provider
+func NewProvider(opts ...provider.Option) provider.Provider {
+	var options provider.Options
+	for _, o := range opts {
+		o(&options)
+	}
+	return &basic{options}
+}
+
+type basic struct {
+	opts provider.Options
+}
+
+func (b *basic) String() string {
+	return "basic"
+}
+
+func (b *basic) Options() provider.Options {
+	return b.opts
+}
+
+func (b *basic) Endpoint() string {
+	return ""
+}
+
+func (b *basic) Redirect() string {
+	return ""
+}

auth/provider/oauth/oauth.go

@@ -0,0 +1,42 @@
+package oauth
+
+import (
+	"fmt"
+
+	"github.com/micro/go-micro/v2/auth/provider"
+)
+
+// NewProvider returns an initialised oauth provider
+func NewProvider(opts ...provider.Option) provider.Provider {
+	var options provider.Options
+	for _, o := range opts {
+		o(&options)
+	}
+	return &oauth{options}
+}
+
+type oauth struct {
+	opts provider.Options
+}
+
+func (o *oauth) String() string {
+	return "oauth"
+}
+
+func (o *oauth) Options() provider.Options {
+	return o.opts
+}
+
+func (o *oauth) Endpoint() string {
+	s := fmt.Sprintf("%v?client_id=%v", o.opts.Endpoint, o.opts.ClientID)
+
+	if scope := o.opts.Scope; len(scope) > 0 {
+		s = fmt.Sprintf("%v&scope=%v", s, scope)
+	}
+
+	return s
+}
+
+func (o *oauth) Redirect() string {
+	return o.opts.Redirect
+}

auth/provider/options.go

@@ -0,0 +1,47 @@
+package provider
+
+// Option returns a function which sets an option
+type Option func(*Options)
+
+// Options a provider can have
+type Options struct {
+	// ClientID is the application's ID.
+	ClientID string
+	// ClientSecret is the application's secret.
+	ClientSecret string
+	// Endpoint for the provider
+	Endpoint string
+	// Redirect url incase of UI
+	Redirect string
+	// Scope of the oauth request
+	Scope string
+}
+
+// Credentials is an option which sets the client id and secret
+func Credentials(id, secret string) Option {
+	return func(o *Options) {
+		o.ClientID = id
+		o.ClientSecret = secret
+	}
+}
+
+// Endpoint sets the endpoint option
+func Endpoint(e string) Option {
+	return func(o *Options) {
+		o.Endpoint = e
+	}
+}
+
+// Redirect sets the Redirect option
+func Redirect(r string) Option {
+	return func(o *Options) {
+		o.Redirect = r
+	}
+}
+
+// Scope sets the oauth scope
+func Scope(s string) Option {
+	return func(o *Options) {
+		o.Scope = s
+	}
+}

auth/provider/provider.go

@@ -0,0 +1,28 @@
+// Package provider is an external auth provider e.g oauth
+package provider
+
+import (
+	"time"
+)
+
+// Provider is an auth provider
+type Provider interface {
+	// String returns the name of the provider
+	String() string
+	// Options returns the options of a provider
+	Options() Options
+	// Endpoint for the provider
+	Endpoint() string
+	// Redirect url incase of UI
+	Redirect() string
+}
+
+// Grant is a granted authorisation
+type Grant struct {
+	// token for reuse
+	Token string
+	// Expiry of the token
+	Expiry time.Time
+	// Scopes associated with grant
+	Scopes []string
+}