gotosocial/internal/text/common.go
ugla 52109776f6
[bugfix] Fix unicode-unaware word boundary check in hashtags (#1049)
* [bugfix] Fix unicode-unaware word boundary check in hashtag regex

Go `\b` does not care for Unicode, and without lookahead, the workarounds got
very ugly. So I replaced the regex with a parser.

The parser runs in O(n) time and performance should not be affected.

* [bugfix] Add back hashtag max length and add tests for it
2022-11-15 16:05:34 +01:00

112 lines
3.5 KiB
Go

/*
GoToSocial
Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package text
import (
"bytes"
"context"
"strings"
"unicode"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/log"
"github.com/superseriousbusiness/gotosocial/internal/regexes"
"github.com/superseriousbusiness/gotosocial/internal/util"
)
func (f *formatter) ReplaceTags(ctx context.Context, in string, tags []*gtsmodel.Tag) string {
spans := util.FindHashtagSpansInText(in)
if len(spans) == 0 {
return in
}
var b strings.Builder
i := 0
spans:
for _, t := range spans {
b.WriteString(in[i:t.First])
i = t.Second
tagAsEntered := in[t.First+1 : t.Second]
for _, tag := range tags {
if strings.EqualFold(tagAsEntered, tag.Name) {
// replace the #tag with the formatted tag content
// `<a href="tag.URL" class="mention hashtag" rel="tag">#<span>tagAsEntered</span></a>
b.WriteString(`<a href="`)
b.WriteString(tag.URL)
b.WriteString(`" class="mention hashtag" rel="tag">#<span>`)
b.WriteString(tagAsEntered)
b.WriteString(`</span></a>`)
continue spans
}
}
b.WriteString(in[t.First:t.Second])
}
// Get the last bits.
i = spans[len(spans)-1].Second
b.WriteString(in[i:])
return b.String()
}
func (f *formatter) ReplaceMentions(ctx context.Context, in string, mentions []*gtsmodel.Mention) string {
return regexes.ReplaceAllStringFunc(regexes.MentionFinder, in, func(match string, buf *bytes.Buffer) string {
// we have a match, trim any spaces
matchTrimmed := strings.TrimSpace(match)
// check through mentions to find what we're matching
for _, menchie := range mentions {
if strings.EqualFold(matchTrimmed, menchie.NameString) {
// make sure we have an account attached to this mention
if menchie.TargetAccount == nil {
a, err := f.db.GetAccountByID(ctx, menchie.TargetAccountID)
if err != nil {
log.Errorf("error getting account with id %s from the db: %s", menchie.TargetAccountID, err)
return match
}
menchie.TargetAccount = a
}
// The mention's target is our target
targetAccount := menchie.TargetAccount
// Add any dropped space from match
if unicode.IsSpace(rune(match[0])) {
buf.WriteByte(match[0])
}
// replace the mention with the formatted mention content
// <span class="h-card"><a href="targetAccount.URL" class="u-url mention">@<span>targetAccount.Username</span></a></span>
buf.WriteString(`<span class="h-card"><a href="`)
buf.WriteString(targetAccount.URL)
buf.WriteString(`" class="u-url mention">@<span>`)
buf.WriteString(targetAccount.Username)
buf.WriteString(`</span></a></span>`)
return buf.String()
}
}
// the match wasn't in the list of mentions for whatever reason, so just return the match as we found it so nothing changes
return match
})
}