fix(gateway): panic on path without enough components

Author: hacdias

gateway/gateway_test.go

@@ -250,8 +250,10 @@ func TestGatewayGet(t *testing.T) {
 		text   string
 	}{
 		{"127.0.0.1:8080", "/", http.StatusNotFound, "404 page not found\n"},
+		{"127.0.0.1:8080", "/ipfs", http.StatusBadRequest, "invalid path \"/ipfs/\": not enough path components\n"},
+		{"127.0.0.1:8080", "/ipns", http.StatusBadRequest, "invalid path \"/ipns/\": not enough path components\n"},
 		{"127.0.0.1:8080", "/" + k.Cid().String(), http.StatusNotFound, "404 page not found\n"},
-		{"127.0.0.1:8080", "/ipfs/this-is-not-a-cid", http.StatusBadRequest, "failed to resolve /ipfs/this-is-not-a-cid: invalid path \"/ipfs/this-is-not-a-cid\": invalid CID: invalid cid: illegal base32 data at input byte 3\n"},
+		{"127.0.0.1:8080", "/ipfs/this-is-not-a-cid", http.StatusBadRequest, "invalid path \"/ipfs/this-is-not-a-cid\": invalid CID: invalid cid: illegal base32 data at input byte 3\n"},
 		{"127.0.0.1:8080", k.String(), http.StatusOK, "fnord"},
 		{"127.0.0.1:8080", "/ipns/nxdomain.example.com", http.StatusInternalServerError, "failed to resolve /ipns/nxdomain.example.com: " + namesys.ErrResolveFailed.Error() + "\n"},
 		{"127.0.0.1:8080", "/ipns/%0D%0A%0D%0Ahello", http.StatusInternalServerError, "failed to resolve /ipns/\\r\\n\\r\\nhello: " + namesys.ErrResolveFailed.Error() + "\n"},

gateway/handler.go

@@ -216,6 +216,11 @@ func (i *handler) getOrHeadHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	if err := contentPath.IsValid(); err != nil {
+		webError(w, err, http.StatusBadRequest)
+		return
+	}
+
 	// Detect when explicit Accept header or ?format parameter are present
 	responseFormat, formatParams, err := customResponseFormat(r)
 	if err != nil {