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- // Copyright (c) 2012-2014 Jeremy Latt
- // Copyright (c) 2016- Daniel Oaks <daniel@danieloaks.net>
- // released under the MIT license
-
- package irc
-
- import (
- "errors"
- "fmt"
- "log"
- "regexp"
- "strings"
-
- "sync"
-
- "github.com/DanielOaks/girc-go/ircmatch"
- )
-
- var (
- ErrNickMissing = errors.New("nick missing")
- ErrNicknameInUse = errors.New("nickname in use")
- ErrNicknameMismatch = errors.New("nickname mismatch")
- )
-
- func ExpandUserHost(userhost string) (expanded string) {
- expanded = userhost
- // fill in missing wildcards for nicks
- //TODO(dan): this would fail with dan@lol, do we want to accommodate that?
- if !strings.Contains(expanded, "!") {
- expanded += "!*"
- }
- if !strings.Contains(expanded, "@") {
- expanded += "@*"
- }
- return
- }
-
- type ClientLookupSet struct {
- ByNickMutex sync.RWMutex
- ByNick map[string]*Client
- }
-
- func NewClientLookupSet() *ClientLookupSet {
- return &ClientLookupSet{
- ByNick: make(map[string]*Client),
- }
- }
-
- func (clients *ClientLookupSet) Count() int {
- clients.ByNickMutex.RLock()
- defer clients.ByNickMutex.RUnlock()
- count := len(clients.ByNick)
- return count
- }
-
- //TODO(dan): wouldn't it be best to always use Get rather than this?
- func (clients *ClientLookupSet) Has(nick string) bool {
- casefoldedName, err := CasefoldName(nick)
- if err == nil {
- return false
- }
- clients.ByNickMutex.RLock()
- defer clients.ByNickMutex.RUnlock()
- _, exists := clients.ByNick[casefoldedName]
- return exists
- }
-
- // getNoMutex is used internally, for getting clients when no mutex is required (i.e. is already set).
- func (clients *ClientLookupSet) getNoMutex(nick string) *Client {
- casefoldedName, err := CasefoldName(nick)
- if err == nil {
- cli := clients.ByNick[casefoldedName]
- return cli
- }
- return nil
- }
-
- func (clients *ClientLookupSet) Get(nick string) *Client {
- casefoldedName, err := CasefoldName(nick)
- if err == nil {
- clients.ByNickMutex.RLock()
- defer clients.ByNickMutex.RUnlock()
- cli := clients.ByNick[casefoldedName]
- return cli
- }
- return nil
- }
-
- func (clients *ClientLookupSet) Add(client *Client, nick string) error {
- nick, err := CasefoldName(nick)
- if err != nil {
- return err
- }
- clients.ByNickMutex.Lock()
- defer clients.ByNickMutex.Unlock()
- if clients.getNoMutex(nick) != nil {
- return ErrNicknameInUse
- }
- clients.ByNick[nick] = client
- return nil
- }
-
- func (clients *ClientLookupSet) Remove(client *Client) error {
- if !client.HasNick() {
- return ErrNickMissing
- }
- clients.ByNickMutex.Lock()
- defer clients.ByNickMutex.Unlock()
- if clients.getNoMutex(client.nick) != client {
- return ErrNicknameMismatch
- }
- delete(clients.ByNick, client.nickCasefolded)
- return nil
- }
-
- func (clients *ClientLookupSet) Replace(oldNick, newNick string, client *Client) error {
- // get casefolded nicknames
- oldNick, err := CasefoldName(oldNick)
- if err != nil {
- return err
- }
- newNick, err = CasefoldName(newNick)
- if err != nil {
- return err
- }
-
- // remove and replace
- clients.ByNickMutex.Lock()
- defer clients.ByNickMutex.Unlock()
-
- oldClient := clients.ByNick[newNick]
- if oldClient == nil || oldClient == client {
- // whoo
- } else {
- return ErrNicknameInUse
- }
-
- if oldNick == newNick {
- // if they're only changing case, don't need to remove+re-add them
- return nil
- }
-
- delete(clients.ByNick, oldNick)
- clients.ByNick[newNick] = client
- return nil
- }
-
- func (clients *ClientLookupSet) AllWithCaps(caps ...Capability) (set ClientSet) {
- set = make(ClientSet)
-
- clients.ByNickMutex.RLock()
- defer clients.ByNickMutex.RUnlock()
- var client *Client
- for _, client = range clients.ByNick {
- // make sure they have all the required caps
- for _, Cap := range caps {
- if !client.capabilities[Cap] {
- continue
- }
- }
-
- set.Add(client)
- }
-
- return set
- }
-
- func (clients *ClientLookupSet) FindAll(userhost string) (set ClientSet) {
- set = make(ClientSet)
-
- userhost, err := Casefold(ExpandUserHost(userhost))
- if err != nil {
- return set
- }
- matcher := ircmatch.MakeMatch(userhost)
-
- clients.ByNickMutex.RLock()
- defer clients.ByNickMutex.RUnlock()
- for _, client := range clients.ByNick {
- if matcher.Match(client.nickMaskCasefolded) {
- set.Add(client)
- }
- }
-
- return set
- }
-
- func (clients *ClientLookupSet) Find(userhost string) *Client {
- userhost, err := Casefold(ExpandUserHost(userhost))
- if err != nil {
- return nil
- }
- matcher := ircmatch.MakeMatch(userhost)
- var matchedClient *Client
-
- clients.ByNickMutex.RLock()
- defer clients.ByNickMutex.RUnlock()
- for _, client := range clients.ByNick {
- if matcher.Match(client.nickMaskCasefolded) {
- matchedClient = client
- break
- }
- }
-
- return matchedClient
- }
-
- //
- // usermask to regexp
- //
-
- //TODO(dan): move this over to generally using glob syntax instead?
- // kinda more expected in normal ban/etc masks, though regex is useful (probably as an extban?)
- type UserMaskSet struct {
- masks map[string]bool
- regexp *regexp.Regexp
- }
-
- func NewUserMaskSet() *UserMaskSet {
- return &UserMaskSet{
- masks: make(map[string]bool),
- }
- }
-
- func (set *UserMaskSet) Add(mask string) bool {
- casefoldedMask, err := Casefold(mask)
- if err != nil {
- log.Println(fmt.Sprintf("ERROR: Could not add mask to usermaskset: [%s]", mask))
- return false
- }
- if set.masks[casefoldedMask] {
- return false
- }
- set.masks[casefoldedMask] = true
- set.setRegexp()
- return true
- }
-
- func (set *UserMaskSet) AddAll(masks []string) (added bool) {
- for _, mask := range masks {
- if !added && !set.masks[mask] {
- added = true
- }
- set.masks[mask] = true
- }
- set.setRegexp()
- return
- }
-
- func (set *UserMaskSet) Remove(mask string) bool {
- if !set.masks[mask] {
- return false
- }
- delete(set.masks, mask)
- set.setRegexp()
- return true
- }
-
- func (set *UserMaskSet) Match(userhost string) bool {
- if set.regexp == nil {
- return false
- }
- return set.regexp.MatchString(userhost)
- }
-
- func (set *UserMaskSet) String() string {
- masks := make([]string, len(set.masks))
- index := 0
- for mask := range set.masks {
- masks[index] = mask
- index += 1
- }
- return strings.Join(masks, " ")
- }
-
- // Generate a regular expression from the set of user mask
- // strings. Masks are split at the two types of wildcards, `*` and
- // `?`. All the pieces are meta-escaped. `*` is replaced with `.*`,
- // the regexp equivalent. Likewise, `?` is replaced with `.`. The
- // parts are re-joined and finally all masks are joined into a big
- // or-expression.
- func (set *UserMaskSet) setRegexp() {
- if len(set.masks) == 0 {
- set.regexp = nil
- return
- }
-
- maskExprs := make([]string, len(set.masks))
- index := 0
- for mask := range set.masks {
- manyParts := strings.Split(mask, "*")
- manyExprs := make([]string, len(manyParts))
- for mindex, manyPart := range manyParts {
- oneParts := strings.Split(manyPart, "?")
- oneExprs := make([]string, len(oneParts))
- for oindex, onePart := range oneParts {
- oneExprs[oindex] = regexp.QuoteMeta(onePart)
- }
- manyExprs[mindex] = strings.Join(oneExprs, ".")
- }
- maskExprs[index] = strings.Join(manyExprs, ".*")
- }
- expr := "^" + strings.Join(maskExprs, "|") + "$"
- set.regexp, _ = regexp.Compile(expr)
- }
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