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test_authserver.go
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test_authserver.go
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package oidctestsupport
import (
"crypto/rand"
"crypto/rsa"
"encoding/json"
"fmt"
"log"
"net/http"
"net/http/httptest"
"net/url"
"time"
"gopkg.in/square/go-jose.v2"
"gopkg.in/square/go-jose.v2/jwt"
)
type FakeAuthServer struct {
Issuer string
clientID string
claims map[string]interface{}
signingKey SigningKey
Server *httptest.Server
}
type SigningKey struct {
key *rsa.PrivateKey
id string
}
func NewFakeAuthServer(clientID string, claims map[string]interface{}) *FakeAuthServer {
k, _ := rsa.GenerateKey(rand.Reader, 2048)
authServer := &FakeAuthServer{
signingKey: SigningKey{
key: k,
id: "some-key-id",
},
clientID: clientID,
claims: claims,
}
mux := http.NewServeMux()
mux.HandleFunc("/.well-known/openid-configuration", authServer.handleWellKnown)
mux.HandleFunc("/authorize", authServer.handleAuthorize)
mux.HandleFunc("/token", authServer.handleToken)
mux.HandleFunc("/jwks", authServer.handleJWKS)
authServer.Server = httptest.NewServer(mux)
authServer.Issuer = authServer.Server.URL
return authServer
}
func (as *FakeAuthServer) handleWellKnown(rw http.ResponseWriter, r *http.Request) {
wellKnownConfig := struct {
Issuer string `json:"issuer,omitempty"`
AuthorizationEndpoint string `json:"authorization_endpoint,omitempty"`
TokenEndpoint string `json:"token_endpoint,omitempty"`
JWKSEndpoint string `json:"jwks_uri,omitempty"`
}{
Issuer: as.Issuer,
AuthorizationEndpoint: fmt.Sprintf("%s/authorize", as.Issuer),
TokenEndpoint: fmt.Sprintf("%s/token", as.Issuer),
JWKSEndpoint: fmt.Sprintf("%s/jwks", as.Issuer),
}
_ = json.NewEncoder(rw).Encode(wellKnownConfig)
}
func (as *FakeAuthServer) handleAuthorize(rw http.ResponseWriter, r *http.Request) {
state := r.URL.Query().Get("state")
redirect := r.URL.Query().Get("redirect_uri")
redirectURI, _ := url.Parse(redirect)
q := redirectURI.Query()
q.Set("code", "42")
q.Set("state", state)
redirectURI.RawQuery = q.Encode()
// todo - inject a way to assert authorize request made by client?
http.Redirect(rw, r, redirectURI.String(), http.StatusFound)
}
func (as *FakeAuthServer) handleToken(rw http.ResponseWriter, r *http.Request) {
_ = r.ParseForm()
if r.FormValue("code") != "42" {
http.Error(rw, fmt.Sprintf("invalid authorization code"), http.StatusBadRequest)
return
}
token, err := as.BuildJWT()
if err != nil {
http.Error(rw, fmt.Sprintf("unable to build token: %s", err), http.StatusInternalServerError)
return
}
resp := struct {
AccessToken string `json:"access_token,omitempty"`
TokenType string `json:"token_type"`
IDToken string `json:"id_token,omitempty"`
}{
AccessToken: token,
TokenType: "Bearer",
IDToken: token,
}
rw.Header().Set("Content-Type", "application/json")
_ = json.NewEncoder(rw).Encode(resp)
}
func (as *FakeAuthServer) handleJWKS(rw http.ResponseWriter, _ *http.Request) {
rw.Header().Set("Content-Type", "application/json")
_, err := rw.Write(as.Jwks())
if err != nil {
log.Println("unable to encode jwks: ", err.Error())
}
}
func (as *FakeAuthServer) Jwks() []byte {
jwk := jose.JSONWebKey{
Key: as.signingKey.key.Public(),
KeyID: as.signingKey.id,
Algorithm: "RS256",
Use: "sig",
}
var keys []jose.JSONWebKey
keys = append(keys, jwk)
jwks := jose.JSONWebKeySet{
Keys: keys,
}
resp, _ := json.Marshal(jwks)
return resp
}
func (as *FakeAuthServer) BuildJWT() (string, error) {
issuedAt := time.Now()
expiresAt := issuedAt.Add(time.Minute)
regClaims := jwt.Claims{
Issuer: as.Issuer,
Audience: jwt.Audience{as.clientID},
Subject: as.clientID,
Expiry: jwt.NewNumericDate(expiresAt),
IssuedAt: jwt.NewNumericDate(issuedAt),
}
sk := jose.SigningKey{Algorithm: jose.RS256, Key: as.signingKey.key}
so := (&jose.SignerOptions{}).
WithType("at+jwt").
WithHeader("kid", as.signingKey.id)
signer, err := jose.NewSigner(sk, so)
if err != nil {
return "", fmt.Errorf("failed to initialize signer: %w", err)
}
raw, err := jwt.Signed(signer).Claims(regClaims).Claims(as.claims).CompactSerialize()
if err != nil {
return "", fmt.Errorf("failed to sign claims: %w", err)
}
return raw, nil
}