Implement OAuth2 service provider functionality.

model/access.go

@@ -9,17 +9,69 @@ import (
 )
 
 const (
-	ACCESS_TOKEN_GRANT_TYPE = "authorization_code"
-	ACCESS_TOKEN_TYPE       = "bearer"
+	ACCESS_TOKEN_GRANT_TYPE  = "authorization_code"
+	ACCESS_TOKEN_TYPE        = "bearer"
+	REFRESH_TOKEN_GRANT_TYPE = "refresh_token"
 )
 
+type AccessData struct {
+	AuthCode     string `json:"auth_code"`
+	Token        string `json"token"`
+	RefreshToken string `json:"refresh_token"`
+	RedirectUri  string `json:"redirect_uri"`
+}
+
 type AccessResponse struct {
 	AccessToken  string `json:"access_token"`
 	TokenType    string `json:"token_type"`
 	ExpiresIn    int32  `json:"expires_in"`
+	Scope        string `json:"scope"`
 	RefreshToken string `json:"refresh_token"`
 }
 
+// IsValid validates the AccessData and returns an error if it isn't configured
+// correctly.
+func (ad *AccessData) IsValid() *AppError {
+
+	if len(ad.AuthCode) == 0 || len(ad.AuthCode) > 128 {
+		return NewAppError("AccessData.IsValid", "Invalid auth code", "")
+	}
+
+	if len(ad.Token) != 26 {
+		return NewAppError("AccessData.IsValid", "Invalid access token", "")
+	}
+
+	if len(ad.RefreshToken) > 26 {
+		return NewAppError("AccessData.IsValid", "Invalid refresh token", "")
+	}
+
+	if len(ad.RedirectUri) > 256 {
+		return NewAppError("AccessData.IsValid", "Invalid redirect uri", "")
+	}
+
+	return nil
+}
+
+func (ad *AccessData) ToJson() string {
+	b, err := json.Marshal(ad)
+	if err != nil {
+		return ""
+	} else {
+		return string(b)
+	}
+}
+
+func AccessDataFromJson(data io.Reader) *AccessData {
+	decoder := json.NewDecoder(data)
+	var ad AccessData
+	err := decoder.Decode(&ad)
+	if err == nil {
+		return &ad
+	} else {
+		return nil
+	}
+}
+
 func (ar *AccessResponse) ToJson() string {
 	b, err := json.Marshal(ar)
 	if err != nil {