Updated

Author: arran4

.editorconfig

@@ -1,2 +1,2 @@
 [*.go]
-end_of_line = cr
+end_of_line = lf

server/handler.go

@@ -1 +1,64 @@
-package serverimport (	"net/http"	"time"	"github.com/go-oauth2/oauth2/v4"	"github.com/go-oauth2/oauth2/v4/errors")type (	// ClientInfoHandler get client info from request	ClientInfoHandler func(r *http.Request) (clientID, clientSecret string, err error)	// ClientAuthorizedHandler check the client allows to use this authorization grant type	ClientAuthorizedHandler func(clientID string, grant oauth2.GrantType) (allowed bool, err error)	// ClientScopeHandler check the client allows to use scope	ClientScopeHandler func(tgr *oauth2.TokenGenerateRequest) (allowed bool, err error)	// UserAuthorizationHandler get user id from request authorization	UserAuthorizationHandler func(w http.ResponseWriter, r *http.Request) (userID string, err error)	// PasswordAuthorizationHandler get user id from username and password	PasswordAuthorizationHandler func(username, password string) (userID string, err error)	// RefreshingScopeHandler check the scope of the refreshing token	RefreshingScopeHandler func(tgr *oauth2.TokenGenerateRequest, oldScope string) (allowed bool, err error)	// ResponseErrorHandler response error handing	ResponseErrorHandler func(re *errors.Response)	// InternalErrorHandler internal error handing	InternalErrorHandler func(err error) (re *errors.Response)	// AuthorizeScopeHandler set the authorized scope	AuthorizeScopeHandler func(w http.ResponseWriter, r *http.Request) (scope string, err error)	// AccessTokenExpHandler set expiration date for the access token	AccessTokenExpHandler func(w http.ResponseWriter, r *http.Request) (exp time.Duration, err error)	// ExtensionFieldsHandler in response to the access token with the extension of the field	ExtensionFieldsHandler func(ti oauth2.TokenInfo) (fieldsValue map[string]interface{}))// ClientFormHandler get client data from formfunc ClientFormHandler(r *http.Request) (string, string, error) {	clientID := r.Form.Get("client_id")	if clientID == "" {		return "", "", errors.ErrInvalidClient	}	clientSecret := r.Form.Get("client_secret")	return clientID, clientSecret, nil}// ClientBasicHandler get client data from basic authorizationfunc ClientBasicHandler(r *http.Request) (string, string, error) {	username, password, ok := r.BasicAuth()	if !ok {		return "", "", errors.ErrInvalidClient	}	return username, password, nil}
+package server
+
+import (
+	"net/http"
+	"time"
+
+	"github.com/go-oauth2/oauth2/v4"
+	"github.com/go-oauth2/oauth2/v4/errors"
+)
+
+type (
+	// ClientInfoHandler get client info from request
+	ClientInfoHandler func(r *http.Request) (clientID, clientSecret string, err error)
+
+	// ClientAuthorizedHandler check the client allows to use this authorization grant type
+	ClientAuthorizedHandler func(clientID string, grant oauth2.GrantType) (allowed bool, err error)
+
+	// ClientScopeHandler check the client allows to use scope
+	ClientScopeHandler func(tgr *oauth2.TokenGenerateRequest) (allowed bool, err error)
+
+	// UserAuthorizationHandler get user id from request authorization
+	UserAuthorizationHandler func(w http.ResponseWriter, r *http.Request) (userID string, err error)
+
+	// PasswordAuthorizationHandler get user id from username and password
+	PasswordAuthorizationHandler func(username, password string) (userID string, err error)
+
+	// RefreshingScopeHandler check the scope of the refreshing token
+	RefreshingScopeHandler func(tgr *oauth2.TokenGenerateRequest, oldScope string) (allowed bool, err error)
+
+	// ResponseErrorHandler response error handing
+	ResponseErrorHandler func(re *errors.Response)
+
+	// InternalErrorHandler internal error handing
+	InternalErrorHandler func(err error) (re *errors.Response)
+
+	// AuthorizeScopeHandler set the authorized scope
+	AuthorizeScopeHandler func(w http.ResponseWriter, r *http.Request) (scope string, err error)
+
+	// AccessTokenExpHandler set expiration date for the access token
+	AccessTokenExpHandler func(w http.ResponseWriter, r *http.Request) (exp time.Duration, err error)
+
+	// ExtensionFieldsHandler in response to the access token with the extension of the field
+	ExtensionFieldsHandler func(ti oauth2.TokenInfo) (fieldsValue map[string]interface{})
+)
+
+
+// ClientFormHandler get client data from form
+func ClientFormHandler(r *http.Request) (string, string, error) {
+	clientID := r.Form.Get("client_id")
+	if clientID == "" {
+		return "", "", errors.ErrInvalidClient
+	}
+	clientSecret := r.Form.Get("client_secret")
+	return clientID, clientSecret, nil
+}
+
+// ClientBasicHandler get client data from basic authorization
+func ClientBasicHandler(r *http.Request) (string, string, error) {
+	username, password, ok := r.BasicAuth()
+	if !ok {
+		return "", "", errors.ErrInvalidClient
+	}
+	return username, password, nil
+}