96 lines
4.9 KiB
Go
96 lines
4.9 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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const (
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minimumPasswordEntropy = 60 // dictates password strength. See https://github.com/wagslane/go-password-validator
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minimumReasonLength = 40
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maximumReasonLength = 500
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maximumEmailLength = 256
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maximumUsernameLength = 64
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maximumPasswordLength = 64
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maximumEmojiShortcodeLength = 30
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maximumHashtagLength = 30
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)
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var (
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// mention regex can be played around with here: https://regex101.com/r/qwM9D3/1
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mentionFinderRegexString = `(?: |^|\W)(@[a-zA-Z0-9_]+(?:@[a-zA-Z0-9_\-\.]+)?)(?: |\n)`
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mentionFinderRegex = regexp.MustCompile(mentionFinderRegexString)
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// hashtag regex can be played with here: https://regex101.com/r/Vhy8pg/1
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hashtagFinderRegexString = fmt.Sprintf(`(?: |^|\W)?#([a-zA-Z0-9]{1,%d})(?:\b|\r)`, maximumHashtagLength)
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hashtagFinderRegex = regexp.MustCompile(hashtagFinderRegexString)
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// emoji shortcode regex can be played with here: https://regex101.com/r/zMDRaG/1
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emojiShortcodeRegexString = fmt.Sprintf(`[a-z0-9_]{2,%d}`, maximumEmojiShortcodeLength)
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emojiShortcodeValidationRegex = regexp.MustCompile(fmt.Sprintf("^%s$", emojiShortcodeRegexString))
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// emoji regex can be played with here: https://regex101.com/r/478XGM/1
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emojiFinderRegexString = fmt.Sprintf(`(?: |^|\W)?:(%s):(?:\b|\r)?`, emojiShortcodeRegexString)
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emojiFinderRegex = regexp.MustCompile(emojiFinderRegexString)
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// usernameRegexString defines an acceptable username on this instance
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usernameRegexString = fmt.Sprintf(`[a-z0-9_]{2,%d}`, maximumUsernameLength)
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// usernameValidationRegex can be used to validate usernames of new signups
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usernameValidationRegex = regexp.MustCompile(fmt.Sprintf(`^%s$`, usernameRegexString))
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userPathRegexString = fmt.Sprintf(`^?/%s/(%s)$`, UsersPath, usernameRegexString)
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// userPathRegex parses a path that validates and captures the username part from eg /users/example_username
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userPathRegex = regexp.MustCompile(userPathRegexString)
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inboxPathRegexString = fmt.Sprintf(`^/?%s/(%s)/%s$`, UsersPath, usernameRegexString, InboxPath)
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// inboxPathRegex parses a path that validates and captures the username part from eg /users/example_username/inbox
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inboxPathRegex = regexp.MustCompile(inboxPathRegexString)
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outboxPathRegexString = fmt.Sprintf(`^/?%s/(%s)/%s$`, UsersPath, usernameRegexString, OutboxPath)
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// outboxPathRegex parses a path that validates and captures the username part from eg /users/example_username/outbox
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outboxPathRegex = regexp.MustCompile(outboxPathRegexString)
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actorPathRegexString = fmt.Sprintf(`^?/%s/(%s)$`, ActorsPath, usernameRegexString)
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// actorPathRegex parses a path that validates and captures the username part from eg /actors/example_username
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actorPathRegex = regexp.MustCompile(actorPathRegexString)
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followersPathRegexString = fmt.Sprintf(`^/?%s/(%s)/%s$`, UsersPath, usernameRegexString, FollowersPath)
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// followersPathRegex parses a path that validates and captures the username part from eg /users/example_username/followers
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followersPathRegex = regexp.MustCompile(followersPathRegexString)
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followingPathRegexString = fmt.Sprintf(`^/?%s/(%s)/%s$`, UsersPath, usernameRegexString, FollowingPath)
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// followingPathRegex parses a path that validates and captures the username part from eg /users/example_username/following
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followingPathRegex = regexp.MustCompile(followingPathRegexString)
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likedPathRegexString = fmt.Sprintf(`^/?%s/%s/%s$`, UsersPath, usernameRegexString, LikedPath)
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// followingPathRegex parses a path that validates and captures the username part from eg /users/example_username/liked
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likedPathRegex = regexp.MustCompile(likedPathRegexString)
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// see https://ihateregex.io/expr/uuid/
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uuidRegexString = `[0-9a-fA-F]{8}\b-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{12}`
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statusesPathRegexString = fmt.Sprintf(`^/?%s/(%s)/%s/(%s)$`, UsersPath, usernameRegexString, StatusesPath, uuidRegexString)
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// statusesPathRegex parses a path that validates and captures the username part and the uuid part
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// from eg /users/example_username/statuses/123e4567-e89b-12d3-a456-426655440000.
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// The regex can be played with here: https://regex101.com/r/G9zuxQ/1
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statusesPathRegex = regexp.MustCompile(statusesPathRegexString)
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)
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