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|
package main
import (
"crypto/tls"
"fmt"
"net/http"
"os"
"time"
"golang.org/x/net/html"
)
func findTitleTag(n *html.Node) string {
if n.Type == html.ElementNode && n.Data == "title" {
if n.FirstChild != nil {
return n.FirstChild.Data
}
}
for c := n.FirstChild; c != nil; c = c.NextSibling {
if result := findTitleTag(c); result != "" {
return result
}
}
return ""
}
func fetchAndParse(client *http.Client, url string, useRange bool) (string, error) {
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return "", fmt.Errorf("failed to create request: %w", err)
}
if useRange {
req.Header.Set("Range", "bytes=0-4096")
}
resp, err := client.Do(req)
if err != nil {
return "", fmt.Errorf("failed to fetch URL: %w", err)
}
defer resp.Body.Close()
doc, err := html.Parse(resp.Body)
if err != nil {
return "", fmt.Errorf("failed to parse HTML: %w", err)
}
return findTitleTag(doc), nil
}
func fetchTitle(url string) (string, error) {
client := &http.Client{
Timeout: 5 * time.Second,
Transport: &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
},
}
// range limit : get request
title, err := fetchAndParse(client, url, true)
if err != nil {
return "", err
}
if title != "" {
return title, nil
}
// no range limit : get reqest
title, err = fetchAndParse(client, url, false)
if err != nil {
return "", err
}
if title == "" {
return "", fmt.Errorf("no title found: %s", url)
}
return title, nil
}
func main() {
if len(os.Args) < 2 {
fmt.Fprintln(os.Stderr, "Usage: ght \"https://google.com/\"")
os.Exit(1)
}
url := os.Args[1]
title, err := fetchTitle(url)
if err != nil {
fmt.Fprintf(os.Stderr, "Error: %v\n", err)
os.Exit(2)
}
fmt.Printf("%s\n", title)
}
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