user service: initial implementation (#17668)

* conceptual user service: initial commit

* reflect review comments

* fix i18n issues and some tests

* implement get user methods

* add license

* reflect review comments

services/users/utils.go

@@ -0,0 +1,69 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package users
+
+import (
+	"strings"
+
+	"github.com/mattermost/mattermost-server/v5/model"
+)
+
+// checkUserDomain checks that a user's email domain matches a list of space-delimited domains as a string.
+func checkUserDomain(user *model.User, domains string) bool {
+	return checkEmailDomain(user.Email, domains)
+}
+
+// checkEmailDomain checks that an email domain matches a list of space-delimited domains as a string.
+func checkEmailDomain(email string, domains string) bool {
+	if domains == "" {
+		return true
+	}
+
+	domainArray := strings.Fields(strings.TrimSpace(strings.ToLower(strings.Replace(strings.Replace(domains, "@", " ", -1), ",", " ", -1))))
+
+	for _, d := range domainArray {
+		if strings.HasSuffix(strings.ToLower(email), "@"+d) {
+			return true
+		}
+	}
+
+	return false
+}
+
+func (us *UserService) sanitizeProfiles(users []*model.User, asAdmin bool) []*model.User {
+	for _, u := range users {
+		us.SanitizeProfile(u, asAdmin)
+	}
+
+	return users
+}
+
+func (us *UserService) SanitizeProfile(user *model.User, asAdmin bool) {
+	options := us.GetSanitizeOptions(asAdmin)
+
+	user.SanitizeProfile(options)
+}
+
+func (us *UserService) GetSanitizeOptions(asAdmin bool) map[string]bool {
+	options := us.config().GetSanitizeOptions()
+	if asAdmin {
+		options["email"] = true
+		options["fullname"] = true
+		options["authservice"] = true
+	}
+	return options
+}
+
+// IsUsernameTaken checks if the username is already used by another user. Return false if the username is invalid.
+func (us *UserService) IsUsernameTaken(name string) bool {
+	if !model.IsValidUsername(name) {
+		return false
+	}
+
+	if _, err := us.store.GetByUsername(name); err != nil {
+		return false
+	}
+
+	return true
+}