mirror of
https://github.com/superseriousbusiness/gotosocial
synced 2024-11-27 23:00:28 +00:00
f8630348b4
* update golangci-lint * add golangci config file w/ more linters * correct issues flagged by stricter linters * add more generous timeout for golangci-lint * add some style + formatting guidelines * move timeout to config file * go fmt
116 lines
3.3 KiB
Go
116 lines
3.3 KiB
Go
/*
|
|
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"
|
|
"net/url"
|
|
|
|
"mvdan.cc/xurls/v2"
|
|
)
|
|
|
|
// schemes is the regex for schemes we accept when looking for links.
|
|
// Basically, we accept https or http.
|
|
var schemes = `(((http|https))://)`
|
|
|
|
// FindLinks parses the given string looking for recognizable URLs (including scheme).
|
|
// It returns a list of those URLs, without changing the string, or an error if something goes wrong.
|
|
// If no URLs are found within the given string, an empty slice and nil will be returned.
|
|
func FindLinks(in string) ([]*url.URL, error) {
|
|
rxStrict, err := xurls.StrictMatchingScheme(schemes)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
urls := []*url.URL{}
|
|
|
|
// bail already if we don't find anything
|
|
found := rxStrict.FindAllString(in, -1)
|
|
if len(found) == 0 {
|
|
return urls, nil
|
|
}
|
|
|
|
// for each string we find, we want to parse it into a URL if we can
|
|
// if we fail to parse it, just ignore this match and continue
|
|
for _, f := range found {
|
|
u, err := url.Parse(f)
|
|
if err != nil {
|
|
continue
|
|
}
|
|
urls = append(urls, u)
|
|
}
|
|
|
|
// deduplicate the URLs
|
|
urlsDeduped := []*url.URL{}
|
|
|
|
for _, u := range urls {
|
|
if !contains(urlsDeduped, u) {
|
|
urlsDeduped = append(urlsDeduped, u)
|
|
}
|
|
}
|
|
|
|
return urlsDeduped, nil
|
|
}
|
|
|
|
// contains checks if the given url is already within a slice of URLs
|
|
func contains(urls []*url.URL, url *url.URL) bool {
|
|
for _, u := range urls {
|
|
if u.String() == url.String() {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// ReplaceLinks replaces all detected links in a piece of text with their HTML (href) equivalents.
|
|
// Note: because Go doesn't allow negative lookbehinds in regex, it's possible that an already-formatted
|
|
// href will end up double-formatted, if the text you pass here contains one or more hrefs already.
|
|
// To avoid this, you should sanitize any HTML out of text before you pass it into this function.
|
|
func (f *formatter) ReplaceLinks(ctx context.Context, in string) string {
|
|
rxStrict, err := xurls.StrictMatchingScheme(schemes)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
replaced := rxStrict.ReplaceAllStringFunc(in, func(urlString string) string {
|
|
thisURL, err := url.Parse(urlString)
|
|
if err != nil {
|
|
return urlString // we can't parse it as a URL so don't replace it
|
|
}
|
|
|
|
shortString := thisURL.Hostname()
|
|
|
|
if thisURL.Path != "" {
|
|
shortString += thisURL.Path
|
|
}
|
|
|
|
if thisURL.Fragment != "" {
|
|
shortString = shortString + "#" + thisURL.Fragment
|
|
}
|
|
|
|
if thisURL.RawQuery != "" {
|
|
shortString = shortString + "?" + thisURL.RawQuery
|
|
}
|
|
|
|
replacement := fmt.Sprintf(`<a href="%s" rel="noopener">%s</a>`, urlString, shortString)
|
|
return replacement
|
|
})
|
|
return replaced
|
|
}
|