gotosocial/internal/util/regexes.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 util
import (
"fmt"
"regexp"
)
const (
minimumPasswordEntropy = 60 // dictates password strength. See https://github.com/wagslane/go-password-validator
minimumReasonLength = 40
maximumReasonLength = 500
maximumEmailLength = 256
maximumUsernameLength = 64
maximumPasswordLength = 64
maximumEmojiShortcodeLength = 30
maximumHashtagLength = 30
)
var (
mentionNameRegexString = `^@([a-zA-Z0-9_]+)(?:@([a-zA-Z0-9_\-\.]+)?)$`
// mention name regex captures the username and domain part from a mention string
// such as @whatever_user@example.org, returning whatever_user and example.org (without the @ symbols)
mentionNameRegex = regexp.MustCompile(mentionNameRegexString)
// mention regex can be played around with here: https://regex101.com/r/qwM9D3/1
mentionFinderRegexString = `(?: |^|\W)(@[a-zA-Z0-9_]+(?:@[a-zA-Z0-9_\-\.]+)?)(?: |\n)`
mentionFinderRegex = regexp.MustCompile(mentionFinderRegexString)
// hashtag regex can be played with here: https://regex101.com/r/Vhy8pg/1
hashtagFinderRegexString = fmt.Sprintf(`(?: |^|\W)?#([a-zA-Z0-9]{1,%d})(?:\b|\r)`, maximumHashtagLength)
hashtagFinderRegex = regexp.MustCompile(hashtagFinderRegexString)
// emoji shortcode regex can be played with here: https://regex101.com/r/zMDRaG/1
emojiShortcodeRegexString = fmt.Sprintf(`[a-z0-9_]{2,%d}`, maximumEmojiShortcodeLength)
emojiShortcodeValidationRegex = regexp.MustCompile(fmt.Sprintf("^%s$", emojiShortcodeRegexString))
// emoji regex can be played with here: https://regex101.com/r/478XGM/1
emojiFinderRegexString = fmt.Sprintf(`(?: |^|\W)?:(%s):(?:\b|\r)?`, emojiShortcodeRegexString)
emojiFinderRegex = regexp.MustCompile(emojiFinderRegexString)
// usernameRegexString defines an acceptable username on this instance
usernameRegexString = fmt.Sprintf(`[a-z0-9_]{2,%d}`, maximumUsernameLength)
// usernameValidationRegex can be used to validate usernames of new signups
usernameValidationRegex = regexp.MustCompile(fmt.Sprintf(`^%s$`, usernameRegexString))
userPathRegexString = fmt.Sprintf(`^?/%s/(%s)$`, UsersPath, usernameRegexString)
// userPathRegex parses a path that validates and captures the username part from eg /users/example_username
userPathRegex = regexp.MustCompile(userPathRegexString)
inboxPathRegexString = fmt.Sprintf(`^/?%s/(%s)/%s$`, UsersPath, usernameRegexString, InboxPath)
// inboxPathRegex parses a path that validates and captures the username part from eg /users/example_username/inbox
inboxPathRegex = regexp.MustCompile(inboxPathRegexString)
outboxPathRegexString = fmt.Sprintf(`^/?%s/(%s)/%s$`, UsersPath, usernameRegexString, OutboxPath)
// outboxPathRegex parses a path that validates and captures the username part from eg /users/example_username/outbox
outboxPathRegex = regexp.MustCompile(outboxPathRegexString)
actorPathRegexString = fmt.Sprintf(`^?/%s/(%s)$`, ActorsPath, usernameRegexString)
// actorPathRegex parses a path that validates and captures the username part from eg /actors/example_username
actorPathRegex = regexp.MustCompile(actorPathRegexString)
followersPathRegexString = fmt.Sprintf(`^/?%s/(%s)/%s$`, UsersPath, usernameRegexString, FollowersPath)
// followersPathRegex parses a path that validates and captures the username part from eg /users/example_username/followers
followersPathRegex = regexp.MustCompile(followersPathRegexString)
followingPathRegexString = fmt.Sprintf(`^/?%s/(%s)/%s$`, UsersPath, usernameRegexString, FollowingPath)
// followingPathRegex parses a path that validates and captures the username part from eg /users/example_username/following
followingPathRegex = regexp.MustCompile(followingPathRegexString)
// see https://ihateregex.io/expr/uuid/
uuidRegexString = `[0-9a-fA-F]{8}\b-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{12}`
likedPathRegexString = fmt.Sprintf(`^/?%s/(%s)/%s$`, UsersPath, usernameRegexString, LikedPath)
// likedPathRegex parses a path that validates and captures the username part from eg /users/example_username/liked
likedPathRegex = regexp.MustCompile(likedPathRegexString)
likePathRegexString = fmt.Sprintf(`^/?%s/(%s)/%s/(%s)$`, UsersPath, usernameRegexString, LikedPath, uuidRegexString)
// likePathRegex parses a path that validates and captures the username part and the uuid part
// from eg /users/example_username/liked/123e4567-e89b-12d3-a456-426655440000.
likePathRegex = regexp.MustCompile(likePathRegexString)
statusesPathRegexString = fmt.Sprintf(`^/?%s/(%s)/%s/(%s)$`, UsersPath, usernameRegexString, StatusesPath, uuidRegexString)
// statusesPathRegex parses a path that validates and captures the username part and the uuid part
// from eg /users/example_username/statuses/123e4567-e89b-12d3-a456-426655440000.
// The regex can be played with here: https://regex101.com/r/G9zuxQ/1
statusesPathRegex = regexp.MustCompile(statusesPathRegexString)
)