refactor(oauth): move build url logic to service

api/http/handler/auth/authenticate_oauth.go

@@ -3,9 +3,6 @@ package auth
 import (
 	"log"
 	"net/http"
-	"strings"
-
-	"golang.org/x/oauth2"
 
 	"github.com/asaskevich/govalidator"
 	httperror "github.com/portainer/libhttp/error"
@@ -88,20 +85,7 @@ func (handler *Handler) loginOAuth(w http.ResponseWriter, r *http.Request) *http
 		return &httperror.HandlerError{http.StatusForbidden, "OAuth authentication is disabled", err}
 	}
 
-	endpoint := oauth2.Endpoint{
-		AuthURL:  settings.OAuthSettings.AuthorizationURI,
-		TokenURL: settings.OAuthSettings.AccessTokenURI,
-	}
-
-	oauthConfig := &oauth2.Config{
-		ClientID:     settings.OAuthSettings.ClientID,
-		ClientSecret: settings.OAuthSettings.ClientSecret,
-		Endpoint:     endpoint,
-		RedirectURL:  settings.OAuthSettings.RedirectURI,
-		Scopes:       strings.Split(settings.OAuthSettings.Scopes, ","),
-	}
-
-	url := oauthConfig.AuthCodeURL("portainer")
+	url := handler.OAuthService.BuildLoginURL(settings.OAuthSettings)
 	http.Redirect(w, r, url, http.StatusTemporaryRedirect)
 	return nil
 }

api/oauth/oauth.go

@@ -165,3 +165,21 @@ func (*Service) GetUsername(token string, settings *portainer.OAuthSettings) (st
 		Body:     body,
 	}
 }
+
+// BuildLoginURL creates a login url for the oauth provider
+func (*Service) BuildLoginURL(oauthSettings portainer.OAuthSettings) string {
+	endpoint := oauth2.Endpoint{
+		AuthURL:  oauthSettings.AuthorizationURI,
+		TokenURL: oauthSettings.AccessTokenURI,
+	}
+
+	oauthConfig := &oauth2.Config{
+		ClientID:     oauthSettings.ClientID,
+		ClientSecret: oauthSettings.ClientSecret,
+		Endpoint:     endpoint,
+		RedirectURL:  oauthSettings.RedirectURI,
+		Scopes:       strings.Split(oauthSettings.Scopes, ","),
+	}
+
+	return oauthConfig.AuthCodeURL("portainer")
+}

api/portainer.go

@@ -766,6 +766,7 @@ type (
 	OAuthService interface {
 		GetAccessToken(code string, settings *OAuthSettings) (string, error)
 		GetUsername(token string, settings *OAuthSettings) (string, error)
+		BuildLoginURL(oauthSettings OAuthSettings) string
 	}
 
 	// SwarmStackManager represents a service to manage Swarm stacks