forked from bettercap/bettercap
/
events_ignore_list.go
113 lines (87 loc) · 1.97 KB
/
events_ignore_list.go
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package modules
import (
"errors"
"fmt"
"strings"
"sync"
"github.com/bettercap/bettercap/session"
"github.com/evilsocket/islazy/str"
)
var (
ErrEmptyExpression = errors.New("expression can not be empty")
)
type IgnoreFilter string
func (f IgnoreFilter) Matches(s string) bool {
return string(f) == s || strings.HasPrefix(s, string(f))
}
type IgnoreList struct {
sync.RWMutex
filters []IgnoreFilter
}
func NewIgnoreList() *IgnoreList {
return &IgnoreList{
filters: make([]IgnoreFilter, 0),
}
}
func (l *IgnoreList) checkExpression(expr string) (string, error) {
expr = str.Trim(expr)
if expr == "" {
return "", ErrEmptyExpression
}
return expr, nil
}
func (l *IgnoreList) Add(expr string) (err error) {
if expr, err = l.checkExpression(expr); err != nil {
return err
}
l.Lock()
defer l.Unlock()
// first check for duplicates
for _, filter := range l.filters {
if filter.Matches(expr) {
return fmt.Errorf("filter '%s' already matches the expression '%s'", filter, expr)
}
}
// all good
l.filters = append(l.filters, IgnoreFilter(expr))
return nil
}
func (l *IgnoreList) Remove(expr string) (err error) {
if expr, err = l.checkExpression(expr); err != nil {
return err
}
l.Lock()
defer l.Unlock()
// build a new list with everything that does not match
toRemove := IgnoreFilter(expr)
newList := make([]IgnoreFilter, 0)
for _, filter := range l.filters {
if !toRemove.Matches(string(filter)) {
newList = append(newList, filter)
}
}
if len(newList) == len(l.filters) {
return fmt.Errorf("expression '%s' did not match any filter", expr)
}
// swap
l.filters = newList
return nil
}
func (l *IgnoreList) Ignored(e session.Event) bool {
l.RLock()
defer l.RUnlock()
for _, filter := range l.filters {
if filter.Matches(e.Tag) {
return true
}
}
return false
}
func (l *IgnoreList) Empty() bool {
l.RLock()
defer l.RUnlock()
return len(l.filters) == 0
}
func (l *IgnoreList) Filters() []IgnoreFilter {
return l.filters
}