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|
package blocklist
import (
"bufio"
"os"
"strings"
)
type Blocklist struct {
domains map[string]struct{}
}
func Load(path string) (*Blocklist, error) {
bl := &Blocklist{domains: make(map[string]struct{})}
f, err := os.Open(path)
if err != nil {
if os.IsNotExist(err) {
return bl, nil
}
return nil, err
}
defer f.Close()
sc := bufio.NewScanner(f)
for sc.Scan() {
line := strings.TrimSpace(sc.Text())
if line == "" || line[0] == '#' || line[0] == '!' {
continue
}
domain := parseLine(line)
if domain != "" && !strings.HasPrefix(domain, "*.") {
bl.domains[strings.ToLower(domain)] = struct {}{}
}
}
return bl, sc.Err()
}
func parseLine(line string) string {
line = strings.TrimSpace(line)
// 1. Hosts: "0.0.0.0 domain" "127.0.0.1 domain # comment"
if strings.HasPrefix(line, "0.0.0.0 ") {
line = line[8:]
} else if strings.HasPrefix(line, "127.0.0.1 ") {
line = line[10:]
} else if strings.HasPrefix(line, "||") {
// 2. AdGuard / uBlock: "||domain^$attr"
line = line[2:]
// Cut at ^ or $
if idx := strings.IndexAny(line, "^$"); idx >= 0 {
line = line[:idx]
}
}
if idx := strings.IndexAny(line, " \t#"); idx >= 0 {
line = line[:idx]
}
line = strings.TrimSpace(line)
line = strings.TrimSuffix(line, ".")
if strings.ContainsAny(line, "/:\\?") {
return ""
}
return line
}
func (bl *Blocklist) Blocked(qname string) bool {
qname = strings.ToLower(qname)
qname = strings.TrimSuffix(qname, ".")
_, ok := bl.domains[qname]
return ok
}
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