fix: support issuer host with path

README.md

@@ -26,7 +26,7 @@ Check the `/example` folder where example code for different scenarios is locate
 # oidc discovery http://localhost:9998/.well-known/openid-configuration
 CAOS_OIDC_DEV=1 go run github.com/caos/oidc/example/server/default
 # start oidc web client
-CLIENT_ID=web CLIENT_SECRET=web ISSUER=http://localhost:9998/ SCOPES=openid PORT=5556 go run github.com/caos/oidc/example/client/app
+CLIENT_ID=web CLIENT_SECRET=web ISSUER=http://localhost:9998/path/to/my/server SCOPES=openid PORT=5556 go run github.com/caos/oidc/example/client/app
 ```
 
 - browser http://localhost:5556/login will redirect to op server

example/server/default/default.go

@@ -17,16 +17,16 @@ func main() {
 	ctx := context.Background()
 	port := "9998"
 	config := &op.Config{
-		Issuer:    "http://localhost:9998/",
+		Issuer:    "http://localhost:9998/path/to/my/server",
 		CryptoKey: sha256.Sum256([]byte("test")),
 	}
 	storage := mock.NewAuthStorage()
-	handler, err := op.NewOpenIDProvider(ctx, config, storage, op.WithCustomTokenEndpoint(op.NewEndpoint("test")))
+	handler, err := op.NewOpenIDProvider(ctx, config, storage, op.WithCustomTokenEndpoint(op.NewEndpointWithIssuersPath(config.Issuer, "test")))
 	if err != nil {
 		log.Fatal(err)
 	}
 	router := handler.HttpHandler().(*mux.Router)
-	router.Methods("GET").Path("/login").HandlerFunc(HandleLogin)
+	router.Methods("GET").Path("/path/to/my/server/login").HandlerFunc(HandleLogin)
 	router.Methods("POST").Path("/login").HandlerFunc(HandleCallback)
 	server := &http.Server{
 		Addr:    ":" + port,
@@ -68,5 +68,5 @@ func HandleLogin(w http.ResponseWriter, r *http.Request) {
 func HandleCallback(w http.ResponseWriter, r *http.Request) {
 	r.ParseForm()
 	client := r.FormValue("client")
-	http.Redirect(w, r, "/authorize/callback?id="+client, http.StatusFound)
+	http.Redirect(w, r, "/path/to/my/server/authorize/callback?id="+client, http.StatusFound)
 }

pkg/op/discovery.go

@@ -20,13 +20,13 @@ func Discover(w http.ResponseWriter, config *oidc.DiscoveryConfiguration) {
 func CreateDiscoveryConfig(c Configuration, s Signer) *oidc.DiscoveryConfiguration {
 	return &oidc.DiscoveryConfiguration{
 		Issuer:                                     c.Issuer(),
-		AuthorizationEndpoint:                      c.AuthorizationEndpoint().Absolute(c.Issuer()),
-		TokenEndpoint:                              c.TokenEndpoint().Absolute(c.Issuer()),
-		IntrospectionEndpoint:                      c.IntrospectionEndpoint().Absolute(c.Issuer()),
-		UserinfoEndpoint:                           c.UserinfoEndpoint().Absolute(c.Issuer()),
-		RevocationEndpoint:                         c.RevocationEndpoint().Absolute(c.Issuer()),
-		EndSessionEndpoint:                         c.EndSessionEndpoint().Absolute(c.Issuer()),
-		JwksURI:                                    c.KeysEndpoint().Absolute(c.Issuer()),
+		AuthorizationEndpoint:                      c.AuthorizationEndpoint().Absolute(getIssuerHost(c.Issuer())),
+		TokenEndpoint:                              c.TokenEndpoint().Absolute(getIssuerHost(c.Issuer())),
+		IntrospectionEndpoint:                      c.IntrospectionEndpoint().Absolute(getIssuerHost(c.Issuer())),
+		UserinfoEndpoint:                           c.UserinfoEndpoint().Absolute(getIssuerHost(c.Issuer())),
+		RevocationEndpoint:                         c.RevocationEndpoint().Absolute(getIssuerHost(c.Issuer())),
+		EndSessionEndpoint:                         c.EndSessionEndpoint().Absolute(getIssuerHost(c.Issuer())),
+		JwksURI:                                    c.KeysEndpoint().Absolute(getIssuerHost(c.Issuer())),
 		ScopesSupported:                            Scopes(c),
 		ResponseTypesSupported:                     ResponseTypes(c),
 		GrantTypesSupported:                        GrantTypes(c),

pkg/op/endpoint.go

@@ -15,6 +15,15 @@ func NewEndpointWithURL(path, url string) Endpoint {
 	return Endpoint{path: path, url: url}
 }
 
+func NewEndpointWithIssuersPath(issuer, path string) Endpoint {
+	issuerPath := getIssuerPath(issuer)
+	if len(issuerPath) > 0 {
+		issuerPath = issuerPath + "/"
+	}
+
+	return Endpoint{path: issuerPath + path}
+}
+
 func (e Endpoint) Relative() string {
 	return relativeEndpoint(e.path)
 }

pkg/op/op.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"net/http"
+	"strings"
 	"time"
 
 	"github.com/gorilla/handlers"
@@ -68,9 +69,15 @@ func CreateRouter(o OpenIDProvider, interceptors ...HttpInterceptor) *mux.Router
 		handlers.AllowedHeaders([]string{"authorization", "content-type"}),
 		handlers.AllowedOriginValidator(allowAllOrigins),
 	))
-	router.HandleFunc(healthEndpoint, healthHandler)
-	router.HandleFunc(readinessEndpoint, readyHandler(o.Probes()))
-	router.HandleFunc(oidc.DiscoveryEndpoint, discoveryHandler(o, o.Signer()))
+
+	issuerPath := getIssuerPath(o.Issuer())
+	if len(issuerPath) > 0 {
+		issuerPath = "/" + issuerPath
+	}
+
+	router.HandleFunc(issuerPath+healthEndpoint, healthHandler)
+	router.HandleFunc(issuerPath+readinessEndpoint, readyHandler(o.Probes()))
+	router.HandleFunc(issuerPath+oidc.DiscoveryEndpoint, discoveryHandler(o, o.Signer()))
 	router.Handle(o.AuthorizationEndpoint().Relative(), intercept(authorizeHandler(o)))
 	router.NewRoute().Path(o.AuthorizationEndpoint().Relative()+"/callback").Queries("id", "{id}").Handler(intercept(authorizeCallbackHandler(o)))
 	router.Handle(o.TokenEndpoint().Relative(), intercept(tokenHandler(o)))
@@ -82,6 +89,36 @@ func CreateRouter(o OpenIDProvider, interceptors ...HttpInterceptor) *mux.Router
 	return router
 }
 
+func NewDefaultEndpoints(issuer string) *endpoints {
+	return &endpoints{
+		Authorization: NewEndpointWithIssuersPath(issuer, defaultAuthorizationEndpoint),
+		Token:         NewEndpointWithIssuersPath(issuer, defaultTokenEndpoint),
+		Introspection: NewEndpointWithIssuersPath(issuer, defaultIntrospectEndpoint),
+		Userinfo:      NewEndpointWithIssuersPath(issuer, defaultUserinfoEndpoint),
+		Revocation:    NewEndpointWithIssuersPath(issuer, defaultRevocationEndpoint),
+		EndSession:    NewEndpointWithIssuersPath(issuer, defaultEndSessionEndpoint),
+		JwksURI:       NewEndpointWithIssuersPath(issuer, defaultKeysEndpoint),
+	}
+}
+
+func getIssuerHost(issuer string) string {
+	split := strings.Split(issuer, "/")
+	if len(split) > 3 {
+		return strings.Join(split[:3], "/")
+	} else {
+		return issuer
+	}
+}
+
+func getIssuerPath(issuer string) string {
+	split := strings.Split(issuer, "/")
+	if len(split) > 3 && len(split[3]) > 0 {
+		return strings.Join(split[3:], "/")
+	} else {
+		return ""
+	}
+}
+
 type Config struct {
 	Issuer                   string
 	CryptoKey                [32]byte
@@ -114,7 +151,7 @@ func NewOpenIDProvider(ctx context.Context, config *Config, storage Storage, opO
 	o := &openidProvider{
 		config:    config,
 		storage:   storage,
-		endpoints: DefaultEndpoints,
+		endpoints: NewDefaultEndpoints(config.Issuer),
 		timer:     make(<-chan time.Time),
 	}
 

pkg/op/op_test.go

@@ -0,0 +1,121 @@
+package op
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetIssuerHost(t *testing.T) {
+	type args struct {
+		issuer string
+	}
+	type res struct {
+		path string
+	}
+	tests := []struct {
+		name string
+		args args
+		res  res
+	}{
+		{
+			name: "just domain, without trailing forward slash",
+			args: args{
+				issuer: "https://localhost",
+			},
+			res: res{
+				path: "https://localhost",
+			},
+		},
+		{
+			name: "just domain, with trailing forward slash",
+			args: args{
+				issuer: "https://localhost/",
+			},
+			res: res{
+				path: "https://localhost",
+			},
+		},
+		{
+			name: "domain with path 1",
+			args: args{
+				issuer: "https://localhost/custompath",
+			},
+			res: res{
+				path: "https://localhost",
+			},
+		},
+		{
+			name: "domain with path 2",
+			args: args{
+				issuer: "https://localhost/custom/path",
+			},
+			res: res{
+				path: "https://localhost",
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			gotPath := getIssuerHost(tt.args.issuer)
+			assert.Equal(t, tt.res.path, gotPath)
+		})
+	}
+}
+
+func TestGetIssuerPath(t *testing.T) {
+	type args struct {
+		issuer string
+	}
+	type res struct {
+		path string
+	}
+	tests := []struct {
+		name string
+		args args
+		res  res
+	}{
+		{
+			name: "just domain, without trailing forward slash",
+			args: args{
+				issuer: "https://localhost",
+			},
+			res: res{
+				path: "",
+			},
+		},
+		{
+			name: "just domain, with trailing forward slash",
+			args: args{
+				issuer: "https://localhost/",
+			},
+			res: res{
+				path: "",
+			},
+		},
+		{
+			name: "domain with path 1",
+			args: args{
+				issuer: "https://localhost/custompath",
+			},
+			res: res{
+				path: "custompath",
+			},
+		},
+		{
+			name: "domain with path 2",
+			args: args{
+				issuer: "https://localhost/custom/path",
+			},
+			res: res{
+				path: "custom/path",
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			gotPath := getIssuerPath(tt.args.issuer)
+			assert.Equal(t, tt.res.path, gotPath)
+		})
+	}
+}