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package main
import (
"crypto/x509"
"encoding/json"
"encoding/pem"
"fmt"
"io/ioutil"
"log"
"net/http"
"text/template"
"time"
"github.com/golang-jwt/jwt"
"github.com/google/uuid"
"github.com/lestrrat-go/jwx/v2/jwk"
)
type AuthorizationRequest struct {
ResponseType string
Scope string
ClientId string
State string
RedirectUri string
Nonce string
}
type TokenRequest struct {
GrantType string
Code string
RedirectUri string
}
type TokenResponse struct {
AccessToken string
TokenType string
RefreshToken string
ExpiresIn int
IdToken string
}
var (
tokens = map[string]string{}
)
func createIdToken(clientId string) string {
now := time.Now()
expiresAt := now.Add(time.Hour * time.Duration(1))
idToken := jwt.NewWithClaims(jwt.SigningMethodRS256, &jwt.StandardClaims{
Issuer: "https://example.com",
Subject: "1",
Audience: clientId,
ExpiresAt: expiresAt.Unix(),
NotBefore: now.Unix(),
IssuedAt: now.Unix(),
Id: uuid.NewString(),
})
keyData, _ := ioutil.ReadFile("insecure.pem")
key, _ := jwt.ParseRSAPrivateKeyFromPEM(keyData)
signedIdToken, _ := idToken.SignedString(key)
return signedIdToken
}
func handler(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == "/" && r.Method == "GET" {
w.WriteHeader(http.StatusOK)
fmt.Fprintf(w, "Hello, world!\n")
} else if r.URL.Path == "/authorize" && r.Method == "GET" {
responseType := r.FormValue("response_type")
if responseType == "code" {
// Authorization Code Flow https://openid.net/specs/openid-connect-core-1_0.html#CodeFlowAuth
ar := &AuthorizationRequest{
ResponseType: r.FormValue("response_type"),
Scope: r.FormValue("scope"),
ClientId: r.FormValue("client_id"),
State: r.FormValue("state"),
RedirectUri: r.FormValue("redirect_uri"),
}
code := uuid.NewString()
tokens[code] = uuid.NewString()
url := fmt.Sprintf("%s?code=%s&state=%s", ar.RedirectUri, code, ar.State)
http.Redirect(w, r, url, 302)
} else if responseType == "id_token token" || responseType == "id_token" {
// Implicit Flow https://openid.net/specs/openid-connect-core-1_0.html#ImplicitFlowAuth
ar := &AuthorizationRequest{
ResponseType: r.FormValue("response_type"),
RedirectUri: r.FormValue("redirect_uri"),
Nonce: r.FormValue("nonce"),
}
idToken := createIdToken(r.FormValue("client_id"))
url := fmt.Sprintf("%s?access_token=example&token_type=bearer&id_token=%s&expires_in=3600&state=%s", ar.RedirectUri, idToken, ar.State)
http.Redirect(w, r, url, 302)
} else if responseType == "code id_token" || responseType == "code token" || responseType == "code id_token token" {
// Hybrid Flow https://openid.net/specs/openid-connect-core-1_0.html#HybridFlowAuth
w.WriteHeader(http.StatusNotImplemented)
} else {
w.WriteHeader(http.StatusNotFound)
fmt.Fprintf(w, "Not Found\n")
}
} else if r.URL.Path == "/token" && r.Method == "POST" {
tr := &TokenRequest{
GrantType: r.FormValue("grant_type"),
Code: r.FormValue("code"),
RedirectUri: r.FormValue("redirect_uri"),
}
if tr.GrantType == "authorization_code" {
// Authorization Code Flow https://openid.net/specs/openid-connect-core-1_0.html#CodeFlowAuth
r := &TokenResponse{
AccessToken: tokens[tr.Code],
TokenType: "Bearer",
RefreshToken: "TODO::",
ExpiresIn: 3600,
IdToken: createIdToken(r.FormValue("client_id")),
}
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Cache-Control", "no-store")
w.Header().Set("Pragma", "no-cache")
fmt.Fprintf(w, `{"access_token": "%s","token_type": "%s","refresh_token": "%s","expires_in": %d,"id_token": "%s"}`, r.AccessToken, r.TokenType, r.RefreshToken, r.ExpiresIn, r.IdToken)
} else {
w.WriteHeader(http.StatusNotFound)
fmt.Fprintf(w, "Not Found\n")
}
} else if r.URL.Path == "/.well-known/openid-configuration" {
w.Header().Set("Content-Type", "application/json")
data, _ := ioutil.ReadFile("openid-configuration.json")
tmpl, _ := template.New("test").Parse(string(data))
tmpl.Execute(w, struct{ Host string }{Host: "http://localhost:8282"})
} else if r.URL.Path == "/userinfo" {
w.WriteHeader(http.StatusNotImplemented)
} else if r.URL.Path == "/.well-known/jwks.json" {
w.Header().Set("Content-Type", "application/json")
keyData, _ := ioutil.ReadFile("insecure.pem")
privatePem, _ := pem.Decode(keyData)
parsedKey, _ := x509.ParsePKCS1PrivateKey(privatePem.Bytes)
key, _ := jwk.FromRaw(parsedKey)
pubKey, _ := jwk.PublicKeyOf(key)
pubKey.Set(jwk.KeyIDKey, "X")
pubKey.Set(jwk.KeyUsageKey, "sig")
set := jwk.NewSet()
set.Add(pubKey)
json.NewEncoder(w).Encode(set)
} else if r.URL.Path == "/revoke" {
w.WriteHeader(http.StatusNotImplemented)
} else {
w.WriteHeader(http.StatusNotFound)
fmt.Fprintf(w, "Not Found\n")
}
}
func main() {
log.Println("Starting server, listening on port 8282.")
server := &http.Server{
Addr: ":8282",
Handler: http.HandlerFunc(handler),
ReadTimeout: 0,
WriteTimeout: 0,
IdleTimeout: 0,
}
log.Fatal(server.ListenAndServe())
}
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