61 lines
1.5 KiB
Go
61 lines
1.5 KiB
Go
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// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
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// See LICENSE.txt for license information.
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package plugindelivery
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import (
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"strings"
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mm_model "github.com/mattermost/mattermost-server/v6/model"
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)
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const (
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usernameSpecialChars = ".-_ "
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)
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func userFromUsername(api PluginAPI, username string) (*mm_model.User, error) {
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user, err := api.GetUserByUsername(username)
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if err == nil {
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return user, nil
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}
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// only continue if the error is `ErrNotFound`
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if !isErrNotFound(err) {
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return nil, err
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}
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// check for usernames in substrings without trailing punctuation
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trimmed, ok := trimUsernameSpecialChar(username)
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for ; ok; trimmed, ok = trimUsernameSpecialChar(trimmed) {
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userFromTrimmed, err2 := api.GetUserByUsername(trimmed)
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if err2 != nil && !isErrNotFound(err2) {
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return nil, err2
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}
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if err2 == nil {
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return userFromTrimmed, nil
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}
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}
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return nil, err
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}
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// trimUsernameSpecialChar tries to remove the last character from word if it
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// is a special character for usernames (dot, dash or underscore). If not, it
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// returns the same string.
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func trimUsernameSpecialChar(word string) (string, bool) {
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len := len(word)
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if len > 0 && strings.LastIndexAny(word, usernameSpecialChars) == (len-1) {
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return word[:len-1], true
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}
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return word, false
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}
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// isErrNotFound returns true if the error is a plugin.ErrNotFound. The pluginAPI converts
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// AppError to the plugin.ErrNotFound var.
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// TODO: add a `IsErrNotFound` method to the plugin API.
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func isErrNotFound(err error) bool {
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return err != nil && err.Error() == "not found"
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}
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