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package httpclient
import (
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"net/http"
"time"
"github.com/johnandersen777/socialweb-computer-kcp/internal/kit/networkdial"
)
var ErrNoCA = errors.New("httpclient: the CA bundle holds no certificate")
type Options struct {
Timeout time.Duration
Hosts networkdial.Resolver
TLS *tls.Config
ProxyFromEnv bool
UserAgent string
OnError func(error)
}
func External(opts Options) *http.Client {
transport, err := networkdial.NewHTTPTransportWithOptions(networkdial.DialOptions{
Hosts: opts.Hosts,
TLSConfig: opts.TLS,
AllowSystemDNS: true,
})
if err != nil {
if opts.OnError != nil {
opts.OnError(err)
}
return &http.Client{Timeout: opts.Timeout, Transport: withUserAgent(nil, opts.UserAgent)}
}
if opts.ProxyFromEnv {
transport.Proxy = http.ProxyFromEnvironment
}
return &http.Client{Timeout: opts.Timeout, Transport: withUserAgent(transport, opts.UserAgent)}
}
type TLSOptions struct {
CAPEM []byte
Pool *x509.CertPool
CertPEM []byte
KeyPEM []byte
ServerName string
Timeout time.Duration
IdleConnTimeout time.Duration
}
func TLSConfig(opts TLSOptions) (*tls.Config, error) {
cfg := &tls.Config{MinVersion: tls.VersionTLS12, ServerName: opts.ServerName, RootCAs: opts.Pool}
if len(opts.CAPEM) > 0 {
pool := x509.NewCertPool()
if !pool.AppendCertsFromPEM(opts.CAPEM) {
return nil, ErrNoCA
}
cfg.RootCAs = pool
}
if len(opts.CertPEM) > 0 || len(opts.KeyPEM) > 0 {
pair, err := tls.X509KeyPair(opts.CertPEM, opts.KeyPEM)
if err != nil {
return nil, fmt.Errorf("httpclient: the client certificate: %w", err)
}
cfg.Certificates = []tls.Certificate{pair}
}
return cfg, nil
}
func TLSClient(opts TLSOptions) (*http.Client, error) {
cfg, err := TLSConfig(opts)
if err != nil {
return nil, err
}
return &http.Client{Timeout: opts.Timeout, Transport: &http.Transport{IdleConnTimeout: opts.IdleConnTimeout, TLSClientConfig: cfg}}, nil
}
func withUserAgent(base http.RoundTripper, agent string) http.RoundTripper {
if agent == "" {
return base
}
if base == nil {
base = http.DefaultTransport
}
return userAgentTransport{base: base, agent: agent}
}
type userAgentTransport struct {
base http.RoundTripper
agent string
}
func (t userAgentTransport) RoundTrip(req *http.Request) (*http.Response, error) {
if req.Header.Get("User-Agent") != "" {
return t.base.RoundTrip(req)
}
clone := req.Clone(req.Context())
clone.Header.Set("User-Agent", t.agent)
return t.base.RoundTrip(clone)
}
