185 lines
8.7 KiB
Go
185 lines
8.7 KiB
Go
// GoToSocial
|
|
// Copyright (C) GoToSocial Authors admin@gotosocial.org
|
|
// SPDX-License-Identifier: AGPL-3.0-or-later
|
|
//
|
|
// 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 regexes
|
|
|
|
import (
|
|
"bytes"
|
|
"regexp"
|
|
"sync"
|
|
|
|
"mvdan.cc/xurls/v2"
|
|
)
|
|
|
|
const (
|
|
users = "users"
|
|
actors = "actors"
|
|
statuses = "statuses"
|
|
inbox = "inbox"
|
|
outbox = "outbox"
|
|
followers = "followers"
|
|
following = "following"
|
|
liked = "liked"
|
|
publicKey = "main-key"
|
|
follow = "follow"
|
|
blocks = "blocks"
|
|
reports = "reports"
|
|
|
|
schemes = `(http|https)://` // Allowed URI protocols for parsing links in text.
|
|
alphaNumeric = `\p{L}\p{M}*|\p{N}` // A single number or script character in any language, including chars with accents.
|
|
usernameGrp = `(?:` + alphaNumeric + `|\.|\-|\_)` // Non-capturing group that matches against a single valid username character.
|
|
domainGrp = `(?:` + alphaNumeric + `|\.|\-|\:)` // Non-capturing group that matches against a single valid domain character.
|
|
mentionName = `^@(` + usernameGrp + `+)(?:@(` + domainGrp + `+))?$` // Extract parts of one mention, maybe including domain.
|
|
mentionFinder = `(?:^|\s)(@` + usernameGrp + `+(?:@` + domainGrp + `+)?)` // Extract all mentions from a text, each mention may include domain.
|
|
emojiShortcode = `\w{2,30}` // Pattern for emoji shortcodes. maximumEmojiShortcodeLength = 30
|
|
emojiFinder = `(?:\b)?:(` + emojiShortcode + `):(?:\b)?` // Extract all emoji shortcodes from a text.
|
|
emojiValidator = `^` + emojiShortcode + `$` // Validate a single emoji shortcode.
|
|
usernameStrict = `^[a-z0-9_]{1,64}$` // Pattern for usernames on THIS instance. maximumUsernameLength = 64
|
|
usernameRelaxed = `[a-z0-9_\.]{1,}` // Relaxed version of username that can match instance accounts too.
|
|
misskeyReportNotesFinder = `(?m)(?:^Note: ((?:http|https):\/\/.*)$)` // Extract reported Note URIs from the text of a Misskey report/flag.
|
|
ulid = `[0123456789ABCDEFGHJKMNPQRSTVWXYZ]{26}` // Pattern for ULID.
|
|
ulidValidate = `^` + ulid + `$` // Validate one ULID.
|
|
|
|
/*
|
|
Path parts / capture.
|
|
*/
|
|
|
|
userPathPrefix = `^/?` + users + `/(` + usernameRelaxed + `)`
|
|
userPath = userPathPrefix + `$`
|
|
userWebPathPrefix = `^/?` + `@(` + usernameRelaxed + `)`
|
|
userWebPath = userWebPathPrefix + `$`
|
|
publicKeyPath = userPathPrefix + `/` + publicKey + `$`
|
|
inboxPath = userPathPrefix + `/` + inbox + `$`
|
|
outboxPath = userPathPrefix + `/` + outbox + `$`
|
|
followersPath = userPathPrefix + `/` + followers + `$`
|
|
followingPath = userPathPrefix + `/` + following + `$`
|
|
likedPath = userPathPrefix + `/` + liked + `$`
|
|
followPath = userPathPrefix + `/` + follow + `/(` + ulid + `)$`
|
|
likePath = userPathPrefix + `/` + liked + `/(` + ulid + `)$`
|
|
statusesPath = userPathPrefix + `/` + statuses + `/(` + ulid + `)$`
|
|
blockPath = userPathPrefix + `/` + blocks + `/(` + ulid + `)$`
|
|
reportPath = `^/?` + reports + `/(` + ulid + `)$`
|
|
filePath = `^/?(` + ulid + `)/([a-z]+)/([a-z]+)/(` + ulid + `)\.([a-z0-9]+)$`
|
|
)
|
|
|
|
var (
|
|
// LinkScheme captures http/https schemes in URLs.
|
|
LinkScheme = func() *regexp.Regexp {
|
|
rgx, err := xurls.StrictMatchingScheme(schemes)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return rgx
|
|
}()
|
|
|
|
// MentionName 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).
|
|
// Will also work for characters with umlauts and other accents.
|
|
// See: https://regex101.com/r/9tjNUy/1 for explanation and examples.
|
|
MentionName = regexp.MustCompile(mentionName)
|
|
|
|
// MentionFinder extracts whole mentions from a piece of text.
|
|
MentionFinder = regexp.MustCompile(mentionFinder)
|
|
|
|
// EmojiValidator validates an emoji shortcode.
|
|
EmojiValidator = regexp.MustCompile(emojiValidator)
|
|
|
|
// EmojiFinder extracts emoji strings from a piece of text.
|
|
// See: https://regex101.com/r/478XGM/1
|
|
EmojiFinder = regexp.MustCompile(emojiFinder)
|
|
|
|
// Username can be used to validate usernames of new signups on this instance.
|
|
Username = regexp.MustCompile(usernameStrict)
|
|
|
|
// MisskeyReportNotes captures a list of Note URIs from report content created by Misskey.
|
|
// See: https://regex101.com/r/EnTOBV/1
|
|
MisskeyReportNotes = regexp.MustCompile(misskeyReportNotesFinder)
|
|
|
|
// UserPath validates and captures the username part from eg /users/example_username.
|
|
UserPath = regexp.MustCompile(userPath)
|
|
|
|
// UserWebPath validates and captures the username part from eg /@example_username.
|
|
UserWebPath = regexp.MustCompile(userWebPath)
|
|
|
|
// PublicKeyPath parses a path that validates and captures the username part from eg /users/example_username/main-key
|
|
PublicKeyPath = regexp.MustCompile(publicKeyPath)
|
|
|
|
// InboxPath parses a path that validates and captures the username part from eg /users/example_username/inbox
|
|
InboxPath = regexp.MustCompile(inboxPath)
|
|
|
|
// OutboxPath parses a path that validates and captures the username part from eg /users/example_username/outbox
|
|
OutboxPath = regexp.MustCompile(outboxPath)
|
|
|
|
// FollowersPath parses a path that validates and captures the username part from eg /users/example_username/followers
|
|
FollowersPath = regexp.MustCompile(followersPath)
|
|
|
|
// FollowingPath parses a path that validates and captures the username part from eg /users/example_username/following
|
|
FollowingPath = regexp.MustCompile(followingPath)
|
|
|
|
// LikedPath parses a path that validates and captures the username part from eg /users/example_username/liked
|
|
LikedPath = regexp.MustCompile(likedPath)
|
|
|
|
// ULID parses and validate a ULID.
|
|
ULID = regexp.MustCompile(ulidValidate)
|
|
|
|
// FollowPath parses a path that validates and captures the username part and the ulid part
|
|
// from eg /users/example_username/follow/01F7XT5JZW1WMVSW1KADS8PVDH
|
|
FollowPath = regexp.MustCompile(followPath)
|
|
|
|
// LikePath parses a path that validates and captures the username part and the ulid part
|
|
// from eg /users/example_username/liked/01F7XT5JZW1WMVSW1KADS8PVDH
|
|
LikePath = regexp.MustCompile(likePath)
|
|
|
|
// StatusesPath parses a path that validates and captures the username part and the ulid part
|
|
// from eg /users/example_username/statuses/01F7XT5JZW1WMVSW1KADS8PVDH
|
|
// The regex can be played with here: https://regex101.com/r/G9zuxQ/1
|
|
StatusesPath = regexp.MustCompile(statusesPath)
|
|
|
|
// BlockPath parses a path that validates and captures the username part and the ulid part
|
|
// from eg /users/example_username/blocks/01F7XT5JZW1WMVSW1KADS8PVDH
|
|
BlockPath = regexp.MustCompile(blockPath)
|
|
|
|
// ReportPath parses a path that validates and captures the ulid part
|
|
// from eg /reports/01GP3AWY4CRDVRNZKW0TEAMB5R
|
|
ReportPath = regexp.MustCompile(reportPath)
|
|
|
|
// FilePath parses a file storage path of the form [ACCOUNT_ID]/[MEDIA_TYPE]/[MEDIA_SIZE]/[FILE_NAME]
|
|
// eg 01F8MH1H7YV1Z7D2C8K2730QBF/attachment/small/01F8MH8RMYQ6MSNY3JM2XT1CQ5.jpeg
|
|
// It captures the account id, media type, media size, file name, and file extension, eg
|
|
// `01F8MH1H7YV1Z7D2C8K2730QBF`, `attachment`, `small`, `01F8MH8RMYQ6MSNY3JM2XT1CQ5`, `jpeg`.
|
|
FilePath = regexp.MustCompile(filePath)
|
|
)
|
|
|
|
// bufpool is a memory pool of byte buffers for use in our regex utility functions.
|
|
var bufpool = sync.Pool{
|
|
New: func() any {
|
|
buf := bytes.NewBuffer(make([]byte, 0, 512))
|
|
return buf
|
|
},
|
|
}
|
|
|
|
// ReplaceAllStringFunc will call through to .ReplaceAllStringFunc in the provided regex, but provide you a clean byte buffer for optimized string writes.
|
|
func ReplaceAllStringFunc(rgx *regexp.Regexp, src string, repl func(match string, buf *bytes.Buffer) string) string {
|
|
buf := bufpool.Get().(*bytes.Buffer) //nolint
|
|
defer bufpool.Put(buf)
|
|
return rgx.ReplaceAllStringFunc(src, func(match string) string {
|
|
buf.Reset() // reset use
|
|
return repl(match, buf)
|
|
})
|
|
}
|