71 lines
2.5 KiB
Go
71 lines
2.5 KiB
Go
/*
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GoToSocial
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Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package util
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import (
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"fmt"
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"regexp"
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)
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// To play around with these regexes, see: https://regex101.com/r/2km2EK/1
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var (
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hostnameRegexString = `(?:(?:[a-zA-Z]{1})|(?:[a-zA-Z]{1}[a-zA-Z]{1})|(?:[a-zA-Z]{1}[0-9]{1})|(?:[0-9]{1}[a-zA-Z]{1})|(?:[a-zA-Z0-9][a-zA-Z0-9-_]{1,61}[a-zA-Z0-9]))\.(?:[a-zA-Z]{2,6}|[a-zA-Z0-9-]{2,30}\.[a-zA-Z]{2,5}))`
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mentionRegexString = fmt.Sprintf(`(?: |^|\W)(@[a-zA-Z0-9_]+@%s(?: |\n)`, hostnameRegexString)
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mentionRegex = regexp.MustCompile(mentionRegexString)
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)
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// DeriveMentions takes a plaintext (ie., not html-formatted) status,
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// and applies a regex to it to return a deduplicated list of accounts
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// mentioned in that status.
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//
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// It will look for fully-qualified account names in the form "@user@example.org".
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// Mentions that are just in the form "@username" will not be detected.
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func DeriveMentions(status string) []string {
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mentionedAccounts := []string{}
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for _, m := range mentionRegex.FindAllStringSubmatch(status, -1) {
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mentionedAccounts = append(mentionedAccounts, m[1])
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}
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return Unique(mentionedAccounts)
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}
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// Unique returns a deduplicated version of a given string slice.
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func Unique(s []string) []string {
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keys := make(map[string]bool)
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list := []string{}
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for _, entry := range s {
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if _, value := keys[entry]; !value {
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keys[entry] = true
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list = append(list, entry)
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}
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}
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return list
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}
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// HTMLFormat takes a plaintext formatted status string, and converts it into
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// a nice HTML-formatted string.
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//
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// This includes:
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// - Replacing line-breaks with <p>
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// - Replacing URLs with hrefs.
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// - Replacing mentions with links to that account's URL as stored in the database.
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func HTMLFormat(status string) string {
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// TODO: write proper HTML formatting logic for a status
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return status
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}
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