WIP: initial piano-id provider

providers/pianoid/pianoid.go

@@ -0,0 +1,138 @@
+package pianoid
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+
+	jwtgo "github.com/golang-jwt/jwt"
+	"github.com/markbates/goth"
+	"golang.org/x/oauth2"
+)
+
+var (
+	// AuthURL ID auth url
+	AuthURL = "https://sandbox.piano.io/id"
+	// TokenURL vx token url
+	TokenURL = "https://sandbox.piano.io/id/api/v1/identity/vxauth/token"
+)
+
+// New creates a new Piano provider, and sets up important connection details.
+// You should always call `github.New` to get a new Provider. Never try to create
+// one manually.
+func New(clientKey, secret, callbackURL string, scopes ...string) *Provider {
+	return NewCustomisedURL(clientKey, secret, callbackURL, AuthURL, TokenURL, scopes...)
+}
+
+// NewCustomisedURL is similar to New(...) but can be used to set custom URLs to connect to
+func NewCustomisedURL(clientKey, secret, callbackURL, authURL, tokenURL string, scopes ...string) *Provider {
+	p := &Provider{
+		ClientKey:    clientKey,
+		Secret:       secret,
+		CallbackURL:  callbackURL,
+		providerName: "pianoid",
+	}
+	p.config = newConfig(p, authURL, tokenURL, scopes)
+	return p
+}
+
+// Provider is the implementation of `goth.Provider` for accessing Piano.
+type Provider struct {
+	ClientKey    string
+	Secret       string
+	CallbackURL  string
+	HTTPClient   *http.Client
+	config       *oauth2.Config
+	providerName string
+	debug        bool
+}
+
+// Name is the name used to retrieve this provider later.
+func (p *Provider) Name() string {
+	return p.providerName
+}
+
+// SetName is to update the name of the provider (needed in case of multiple providers of 1 type)
+func (p *Provider) SetName(name string) {
+	p.providerName = name
+}
+
+// Client asdf
+func (p *Provider) Client() *http.Client {
+	return goth.HTTPClientWithFallBack(p.HTTPClient)
+}
+
+// Debug is a no-op for the github package.
+func (p *Provider) Debug(debug bool) { p.debug = debug }
+
+// BeginAuth asks Piano for an authentication end-point.
+func (p *Provider) BeginAuth(state string) (goth.Session, error) {
+	url := p.config.AuthCodeURL(state)
+	session := &Session{
+		AuthURL: url,
+	}
+	return session, nil
+}
+
+// FetchUser will go to Piano and access basic information about the user.
+func (p *Provider) FetchUser(session goth.Session) (goth.User, error) {
+	sess := session.(*Session)
+	user := goth.User{
+		AccessToken: sess.AccessToken,
+		Provider:    p.Name(),
+	}
+	if user.AccessToken == "" {
+		// data is not yet retrieved since accessToken is still empty
+		return user, fmt.Errorf("%s cannot get user information without accessToken", p.providerName)
+	}
+	/// Decode The token
+
+	token, _ := jwtgo.Parse(user.AccessToken, func(token *jwtgo.Token) (interface{}, error) {
+		// Don't forget to validate the alg is what you expect:
+		if _, ok := token.Method.(*jwtgo.SigningMethodHMAC); !ok {
+			return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
+		}
+
+		return []byte("XXX"), nil
+	})
+	// Token could not be parsed. like it is not signed or tampered
+	// if it is failed AND AllowInvalid is not specified -> continue
+	claims := token.Claims.(jwtgo.MapClaims)
+	user.Email = claims["email"].(string)
+	user.FirstName = claims["given_name"].(string)
+	user.LastName = claims["family_name"].(string)
+	user.UserID = claims["sub"].(string)
+	user.RawData = claims
+
+	/// Fetch Profile Details or extract access token
+	return user, nil
+}
+
+func newConfig(provider *Provider, authURL, tokenURL string, scopes []string) *oauth2.Config {
+	c := &oauth2.Config{
+		ClientID:     provider.ClientKey,
+		ClientSecret: provider.Secret,
+		RedirectURL:  provider.CallbackURL,
+		Endpoint: oauth2.Endpoint{
+			AuthURL:  authURL,
+			TokenURL: tokenURL,
+		},
+		Scopes: []string{},
+	}
+
+	for _, scope := range scopes {
+		c.Scopes = append(c.Scopes, scope)
+	}
+
+	return c
+}
+
+//RefreshToken refresh token is not provided by github
+func (p *Provider) RefreshToken(refreshToken string) (*oauth2.Token, error) {
+	return nil, errors.New("Refresh token is not provided by pianoid")
+}
+
+//RefreshTokenAvailable refresh token is not provided by github
+func (p *Provider) RefreshTokenAvailable() bool {
+	return false
+}

providers/pianoid/session.go

@@ -0,0 +1,57 @@
+package pianoid
+
+import (
+	"encoding/json"
+	"errors"
+	"strings"
+
+	"github.com/markbates/goth"
+)
+
+// Session stores data during the auth process with Github.
+type Session struct {
+	AuthURL     string
+	AccessToken string
+}
+
+// GetAuthURL will return the URL set by calling the `BeginAuth` function on the Github provider.
+func (s Session) GetAuthURL() (string, error) {
+	if s.AuthURL == "" {
+		return "", errors.New(goth.NoAuthUrlErrorMessage)
+	}
+	return s.AuthURL, nil
+}
+
+// Authorize the session with Github and return the access token to be stored for future use.
+func (s *Session) Authorize(provider goth.Provider, params goth.Params) (string, error) {
+	p := provider.(*Provider)
+	token, err := p.config.Exchange(goth.ContextForClient(p.Client()), params.Get("code"))
+
+	if err != nil {
+		return "", err
+	}
+
+	if !token.Valid() {
+		return "", errors.New("Invalid token received from provider")
+	}
+
+	s.AccessToken = token.AccessToken
+	return token.AccessToken, err
+}
+
+// Marshal the session into a string
+func (s Session) Marshal() string {
+	b, _ := json.Marshal(s)
+	return string(b)
+}
+
+func (s Session) String() string {
+	return s.Marshal()
+}
+
+// UnmarshalSession will unmarshal a JSON string into a session.
+func (p *Provider) UnmarshalSession(data string) (goth.Session, error) {
+	sess := &Session{}
+	err := json.NewDecoder(strings.NewReader(data)).Decode(sess)
+	return sess, err
+}