gotosocial/internal/text/common.go

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/*
GoToSocial
Copyright (C) 2021 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 (
"context"
"fmt"
"html"
"strings"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
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"github.com/superseriousbusiness/gotosocial/internal/regexes"
)
// preformat contains some common logic for making a string ready for formatting, which should be used for all user-input text.
func preformat(in string) string {
// do some preformatting of the text
// 1. unescape everything that might be html escaped
s := html.UnescapeString(in)
// 2. trim leading or trailing whitespace
s = strings.TrimSpace(s)
return s
}
// postformat contains some common logic for html sanitization of text, wrapping elements, and trimming newlines and whitespace
func postformat(in string) string {
// do some postformatting of the text
// 1. sanitize html to remove potentially dangerous elements
s := SanitizeHTML(in)
// 2. the sanitize step tends to escape characters inside codeblocks, which is behavior we don't want, so unescape everything again
s = html.UnescapeString(s)
// 3. minify html to remove any trailing newlines, spaces, unnecessary elements, etc etc
mini, err := minifyHTML(s)
if err != nil {
// if the minify failed, just return what we have
return s
}
// return minified version of the html
return mini
}
func (f *formatter) ReplaceTags(ctx context.Context, in string, tags []*gtsmodel.Tag) string {
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return regexes.HashtagFinder.ReplaceAllStringFunc(in, func(match string) string {
// we have a match
matchTrimmed := strings.TrimSpace(match)
tagAsEntered := strings.Split(matchTrimmed, "#")[1]
// check through the tags to find what we're matching
for _, tag := range tags {
if strings.EqualFold(matchTrimmed, fmt.Sprintf("#%s", tag.Name)) {
// replace the #tag with the formatted tag content
tagContent := fmt.Sprintf(`<a href="%s" class="mention hashtag" rel="tag">#<span>%s</span></a>`, tag.URL, tagAsEntered)
// in case the match picked up any previous space or newlines (thanks to the regex), include them as well
if strings.HasPrefix(match, " ") {
tagContent = " " + tagContent
} else if strings.HasPrefix(match, "\n") {
tagContent = "\n" + tagContent
}
// done
return tagContent
}
}
// the match wasn't in the list of tags for whatever reason, so just return the match as we found it so nothing changes
return match
})
}
func (f *formatter) ReplaceMentions(ctx context.Context, in string, mentions []*gtsmodel.Mention) string {
for _, menchie := range mentions {
// make sure we have a target account, either by getting one pinned on the mention,
// or by pulling it from the database
var targetAccount *gtsmodel.Account
if menchie.OriginAccount != nil {
// got it from the mention
targetAccount = menchie.OriginAccount
} else {
a, err := f.db.GetAccountByID(ctx, menchie.TargetAccountID)
if err == nil {
// got it from the db
targetAccount = a
} else {
// couldn't get it so we can't do replacement
return in
}
}
mentionContent := fmt.Sprintf(`<span class="h-card"><a href="%s" class="u-url mention">@<span>%s</span></a></span>`, targetAccount.URL, targetAccount.Username)
in = strings.ReplaceAll(in, menchie.NameString, mentionContent)
}
return in
}