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proxy.go
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155 lines (149 loc) · 3.97 KB
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package main
import (
"bytes"
"crypto/tls"
"io"
"net/http"
"net/http/httputil"
"net/url"
"os"
"strings"
)
type Proxy struct {
KeyLoader KeyLoader
}
func (p *Proxy) GetTLSConfig(certPath string, keyPath string) (*tls.Config, error) {
tlsConfig := &tls.Config{
InsecureSkipVerify: true,
}
if certPath == "" && keyPath == "" {
return tlsConfig, nil
}
cert, err := p.KeyLoader.LoadKey(certPath)
if err != nil {
return tlsConfig, err
}
key, err := p.KeyLoader.LoadKey(keyPath)
if err != nil {
return tlsConfig, err
}
certificate, err := tls.X509KeyPair(cert, key)
if err != nil {
return tlsConfig, err
}
tlsConfig.Certificates = []tls.Certificate{certificate}
tlsConfig.Renegotiation = tls.RenegotiateOnceAsClient
return tlsConfig, nil
}
func (p *Proxy) ListenAndServe() error {
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
return
}
tlsConfig, err := p.GetTLSConfig(r.Header.Get(CertHeader), r.Header.Get(KeyHeader))
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
proxy := httputil.ReverseProxy{
Transport: &http.Transport{
TLSClientConfig: tlsConfig,
},
Director: func(request *http.Request) {
urlString := r.Header.Get(UrlHeader)
if urlString == "" {
http.Error(w, "Url not provided", http.StatusBadRequest)
return
}
requestUrl, err := url.Parse(urlString)
if err != nil {
http.Error(w, "Bad url", http.StatusBadRequest)
return
}
request.URL = requestUrl
method := r.Header.Get(MethodHeader)
if method == "" {
http.Error(w, "Method not provided", http.StatusBadRequest)
return
}
request.Method = method
outReqHeaders := map[string][]string{}
canonicalPrefix := http.CanonicalHeaderKey(RequestHeaderPrefix)
for key, value := range request.Header {
canonicalKey := http.CanonicalHeaderKey(key)
if strings.HasPrefix(canonicalKey, canonicalPrefix) {
outReqHeaders[strings.TrimPrefix(canonicalKey, canonicalPrefix)] = value
}
}
request.Header = outReqHeaders
bodyCopy := &bytes.Buffer{}
b, err := io.Copy(bodyCopy, r.Body)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
// Explicitly set the content length to avoid chunked encoding
request.ContentLength = b
request.Host = requestUrl.Host
request.Body = io.NopCloser(bodyCopy)
},
}
proxy.ServeHTTP(w, r)
})
http.HandleFunc("/sign", func(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
return
}
algorithmString := r.Header.Get(SignAlgorithmHeader)
if algorithmString == "" {
http.Error(w, "No "+SignAlgorithmHeader+" header specified", http.StatusBadRequest)
return
}
keyName := r.Header.Get(KeyHeader)
if keyName == "" {
http.Error(w, "No "+KeyHeader+" header specified", http.StatusBadRequest)
return
}
keyContent, err := p.KeyLoader.LoadKey(keyName)
if err != nil {
http.Error(w, "Error loading key", http.StatusBadRequest)
return
}
privateKey, err := loadPrivateKey(keyContent)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
body, err := io.ReadAll(r.Body)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
algorithmMap := map[string]int{
"rs256": rs256,
"ps256": ps256,
}
algorithm, ok := algorithmMap[algorithmString]
if !ok {
http.Error(w, "Unsupported algorithm", http.StatusBadRequest)
return
}
signature, err := sign(privateKey, body, algorithm)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
_, err = w.Write([]byte(signature))
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
})
port := os.Getenv("PORT")
if port == "" {
port = "8080"
}
return http.ListenAndServe(":"+port, nil)
}