bearer: add some tests

toolkit/server/bearer/bearer_test.go

@@ -0,0 +1,32 @@
+package bearer
+
+import (
+	"net/http"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"github.com/ucan-wg/go-ucan/pkg/container"
+	"github.com/ucan-wg/go-ucan/pkg/container/containertest"
+)
+
+func TestHTTPBearer(t *testing.T) {
+	for _, fn := range []func(h http.Header, container container.Writer) error{
+		AddBearerContainer,
+		AddBearerContainerCompressed,
+	} {
+		r, err := http.NewRequest(http.MethodPost, "/foo/bar", nil)
+		require.NoError(t, err)
+
+		cont, err := container.FromBytes(containertest.Bytes)
+		require.NoError(t, err)
+
+		err = fn(r.Header, cont.ToWriter())
+		require.NoError(t, err)
+
+		contRead, err := ExtractBearerContainer(r.Header)
+		require.NoError(t, err)
+
+		require.NotEmpty(t, contRead)
+		require.Equal(t, cont, contRead)
+	}
+}

toolkit/server/exectx/middleware.go

@@ -1,43 +0,0 @@
-package exectx
-
-import (
-	"errors"
-	"net/http"
-
-	"github.com/INFURA/go-ucan-toolkit/server/bearer"
-)
-
-// Middleware returns an HTTP middleware tasked with:
-// - extracting UCAN credentials from the `Authorization: Bearer <data>` HTTP header
-// - performing basic checks, and returning HTTP errors if necessary
-// - exposing those credentials in the go context as a UcanCtx for further usage
-func Middleware(next http.Handler) http.Handler {
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		ctn, err := bearer.ExtractBearerContainer(r.Header)
-		if errors.Is(err, bearer.ErrNoUcan) {
-			http.Error(w, "no UCAN auth", http.StatusBadRequest)
-			return
-		}
-		if errors.Is(err, bearer.ErrContainerMalformed) {
-			http.Error(w, "malformed token", http.StatusBadRequest)
-			return
-		}
-		if err != nil {
-			// should not happen, defensive programming
-			http.Error(w, err.Error(), http.StatusInternalServerError)
-			return
-		}
-
-		// prepare a UcanCtx from the container, for further evaluation in the server pipeline
-		ucanCtx, err := FromContainer(ctn)
-		if err != nil {
-			http.Error(w, err.Error(), http.StatusInternalServerError)
-			return
-		}
-
-		// insert into the go context
-		r = r.WithContext(AddUcanCtxToContext(r.Context(), ucanCtx))
-
-		next.ServeHTTP(w, r)
-	})
-}

toolkit/server/exectx/middlewares.go

@@ -0,0 +1,87 @@
+package exectx
+
+import (
+	"errors"
+	"net/http"
+
+	"github.com/ucan-wg/go-ucan/did"
+
+	"github.com/INFURA/go-ucan-toolkit/server/bearer"
+)
+
+// ExtractMW returns an HTTP middleware tasked with:
+// - extracting UCAN credentials from the `Authorization: Bearer <data>` HTTP header
+// - performing basic checks, and returning HTTP errors if necessary
+// - verify that the invocation targets our service
+// - exposing those credentials in the go context as a UcanCtx for further usage
+func ExtractMW(next http.Handler, serviceDID did.DID) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		ctn, err := bearer.ExtractBearerContainer(r.Header)
+		if errors.Is(err, bearer.ErrNoUcan) {
+			http.Error(w, "no UCAN auth", http.StatusBadRequest)
+			return
+		}
+		if errors.Is(err, bearer.ErrContainerMalformed) {
+			http.Error(w, "malformed token", http.StatusBadRequest)
+			return
+		}
+		if err != nil {
+			// should not happen, defensive programming
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		// prepare a UcanCtx from the container, for further evaluation in the server pipeline
+		ucanCtx, err := FromContainer(ctn)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		if ucanCtx.Invocation().Subject() != serviceDID {
+			http.Error(w, "UCAN delegation doesn't match the service DID", http.StatusUnauthorized)
+			return
+		}
+
+		// insert into the go context
+		r = r.WithContext(AddUcanCtxToContext(r.Context(), ucanCtx))
+
+		next.ServeHTTP(w, r)
+	})
+}
+
+// HttpExtArgsVerify returns an HTTP middleware tasked with verifying the UCAN policies applying on the HTTP request.
+func HttpExtArgsVerify(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		ucanCtx, ok := FromContext(r.Context())
+		if !ok {
+			http.Error(w, "no ucan-ctx found", http.StatusInternalServerError)
+			return
+		}
+
+		if err := ucanCtx.VerifyHttp(r); err != nil {
+			http.Error(w, err.Error(), http.StatusForbidden)
+			return
+		}
+
+		next.ServeHTTP(w, r)
+	})
+}
+
+// EnforceMW returns an HTTP middleware tasked with the final verification of the UCAN policies.
+func EnforceMW(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		ucanCtx, ok := FromContext(r.Context())
+		if !ok {
+			http.Error(w, "no ucan-ctx found", http.StatusInternalServerError)
+			return
+		}
+
+		if err := ucanCtx.ExecutionAllowed(); err != nil {
+			http.Error(w, err.Error(), http.StatusForbidden)
+			return
+		}
+
+		next.ServeHTTP(w, r)
+	})
+}