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client.go
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client.go
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package tokenizer
import (
"context"
"crypto/tls"
"crypto/x509"
"fmt"
"net/http"
"net/url"
"strings"
"golang.org/x/exp/maps"
"golang.org/x/exp/slices"
)
var downstreamTrust *x509.CertPool
func init() {
var err error
downstreamTrust, err = x509.SystemCertPool()
if err != nil {
panic(err)
}
}
type ClientOption func(*clientOptions)
type clientOptions struct {
headers http.Header
transport *http.Transport
}
func (co *clientOptions) getTransport() *http.Transport {
if co.transport != nil {
return co.transport.Clone()
}
return http.DefaultTransport.(*http.Transport).Clone()
}
func WithSecret(sealedSecret string, params map[string]string) ClientOption {
return func(co *clientOptions) {
if co.headers == nil {
co.headers = make(http.Header)
}
co.headers.Add(headerProxyTokenizer, formatHeaderProxyTokenizer(sealedSecret, params))
}
}
func WithAuth(auth string) ClientOption {
if len(auth) < 6 || auth[:6] != "FlyV1 " {
auth = fmt.Sprintf("Bearer %s", auth)
}
return func(co *clientOptions) {
if co.headers == nil {
co.headers = make(http.Header)
}
co.headers.Add(headerProxyAuthorization, auth)
}
}
func WithTransport(t *http.Transport) ClientOption {
return func(co *clientOptions) {
co.transport = t
}
}
func Client(proxyURL string, opts ...ClientOption) (*http.Client, error) {
t, err := Transport(proxyURL, opts...)
if err != nil {
return nil, err
}
return &http.Client{Transport: t}, nil
}
func Transport(proxyURL string, opts ...ClientOption) (http.RoundTripper, error) {
u, err := url.Parse(proxyURL)
if err != nil {
return nil, err
}
copts := &clientOptions{}
for _, o := range opts {
o(copts)
}
t := copts.getTransport()
t.Proxy = http.ProxyURL(u)
t.TLSClientConfig = &tls.Config{RootCAs: downstreamTrust}
// t.ForceAttemptHTTP2 = true
return forceHTTP(headerInjector(t, copts.headers)), nil
}
type roundTripperFunc func(*http.Request) (*http.Response, error)
func (rtf roundTripperFunc) RoundTrip(req *http.Request) (*http.Response, error) {
return rtf(req)
}
func forceHTTP(t http.RoundTripper) http.RoundTripper {
return roundTripperFunc(func(r *http.Request) (*http.Response, error) {
if strings.EqualFold(r.URL.Scheme, "https") {
r = r.Clone(r.Context())
r.URL.Scheme = "http"
}
return t.RoundTrip(r)
})
}
type ctxKey string
var ctxKeyInjected ctxKey = "injected"
func headerInjector(t http.RoundTripper, h http.Header) http.RoundTripper {
return roundTripperFunc(func(r *http.Request) (*http.Response, error) {
// avoid duplicate injections on retries, etc...
if r.Context().Value(ctxKeyInjected) == nil {
r = r.WithContext(context.WithValue(r.Context(), ctxKeyInjected, true))
r.Header = maps.Clone(r.Header)
mergeHeader(r.Header, h)
}
return t.RoundTrip(r)
})
}
func mergeHeader(dst, src map[string][]string) {
for k, vs := range src {
dst[k] = append(dst[k], vs...)
slices.Sort(dst[k])
dst[k] = slices.Compact(dst[k])
}
}