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package useragent
import (
"fmt"
"net/http"
"os"
"runtime"
)
var (
hostname = "<unknown>"
)
func init() {
name, _ := os.Hostname()
if name != "" {
hostname = name
}
}
// GenUserAgent creates a unique User-Agent string for outgoing HTTP requests.
func GenUserAgent(prefix, infoURL string) string {
return fmt.Sprintf(
"%s (%s/%s/%s; %s; +%s) Hostname/%s",
prefix, runtime.Version(), runtime.GOOS, runtime.GOARCH, infoURL,
os.Args[0], hostname,
)
}
// Transport wraps a http transport with user agent information.
func Transport(prefix, infoURL string, rt http.RoundTripper) http.RoundTripper {
return userAgentTransport{prefix: prefix, infoURL: infoURL, rt: rt}
}
type userAgentTransport struct {
prefix, infoURL string
rt http.RoundTripper
}
func (uat userAgentTransport) RoundTrip(r *http.Request) (*http.Response, error) {
r.Header.Set("User-Agent", GenUserAgent(uat.prefix, uat.infoURL))
return uat.rt.RoundTrip(r)
}
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