mirror of
https://github.com/therootcompany/golib.git
synced 2026-11-04 06:55:00 +00:00
AJ ONeal
bea4c3de0a
IPv4 host + CIDR membership testing backed by sorted /32 binary search and a linear scan of CIDR ranges. CSV/text loader with bounded reads (maxBytes is required so callers pick a limit appropriate to their input source — 1 KB allowlists through 100+ MB threat feeds). Returns errors for unparseable IPs so callers can decide fail-open vs fail-closed; partial cohorts are returned alongside parse errors.
88 lines
1.6 KiB
Go
88 lines
1.6 KiB
Go
package main
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import (
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"encoding/csv"
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"encoding/json"
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"fmt"
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"os"
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"strconv"
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"strings"
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)
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// isTTYish reports whether f is a terminal (character device).
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func isTTYish(f *os.File) bool {
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fi, err := f.Stat()
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if err != nil {
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return false
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}
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m := os.ModeDevice | os.ModeCharDevice
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return fi.Mode()&m == m
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}
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// writeTable renders results in the chosen format to stdout.
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func writeTable(format string, results []result) error {
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switch format {
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case formatPretty:
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w := 0
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for _, r := range results {
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if len(r.IP) > w {
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w = len(r.IP)
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}
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}
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for _, r := range results {
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fmt.Printf("%-*s %s\n", w, r.IP, statusLabel(r.Found))
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}
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case formatTSV:
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for _, r := range results {
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fmt.Printf("%s\t%s\n", r.IP, statusLabel(r.Found))
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}
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case formatCSV:
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cw := csv.NewWriter(os.Stdout)
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_ = cw.Write([]string{"ip", "status"})
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for _, r := range results {
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if err := cw.Write([]string{r.IP, statusLabel(r.Found)}); err != nil {
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return err
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}
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}
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cw.Flush()
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return cw.Error()
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case formatJSON:
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enc := json.NewEncoder(os.Stdout)
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enc.SetIndent("", " ")
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return enc.Encode(results)
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}
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return nil
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}
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func statusLabel(found bool) string {
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if found {
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return "FOUND"
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}
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return "NOT FOUND"
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}
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// commafy renders n with thousands separators, e.g. 1234567 -> "1,234,567".
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func commafy(n int) string {
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s := strconv.Itoa(n)
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neg := ""
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if n < 0 {
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neg, s = "-", s[1:]
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}
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if len(s) <= 3 {
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return neg + s
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}
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var b strings.Builder
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head := len(s) % 3
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if head > 0 {
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b.WriteString(s[:head])
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b.WriteByte(',')
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}
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for i := head; i < len(s); i += 3 {
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b.WriteString(s[i : i+3])
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if i+3 < len(s) {
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b.WriteByte(',')
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}
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}
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return neg + b.String()
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}
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