fix: prevent Jackson to serialize a getPolicies in the User class as Stream object

Author: caro3801

datashare-api/src/main/java/org/icij/datashare/user/User.java

@@ -78,7 +78,8 @@ public User(Map<String, Object> map) {
                 (String)map.getOrDefault("provider", LOCAL),
                 map, //details
                 (String)map.get("jsonProjectKey"),
-                (Set<UserPolicy>) map.get("policies"));
+                (Set<UserPolicy>) Optional.ofNullable(map.get("policies"))
+                        .orElse(Collections.emptySet()));
     }
 
     public User(User user) {
@@ -268,6 +269,7 @@ public Optional<UserPolicy> getPolicy(String projectId) {
                 findFirst();
     }
 
+    @JsonIgnore
     public Stream<UserPolicy> getPolicies() {
         return policies.stream();
     }

datashare-app/src/test/java/org/icij/datashare/session/DatashareUserTest.java

@@ -13,7 +13,7 @@ public void test_serialize_deserialize() throws Exception {
         ObjectMapper objectMapper = new ObjectMapper();
 
         String json = objectMapper.writeValueAsString(new DatashareUser(new User("id", "name", "email", "provider", "{\"key1\": \"value1\", \"key2\": \"value2\"}")));
-        assertThat(json).contains("{\"id\":\"id\",\"name\":\"name\",\"email\":\"email\",\"provider\":\"provider\",\"policies\":[]}");
+        assertThat(json).contains("{\"id\":\"id\",\"name\":\"name\",\"email\":\"email\",\"provider\":\"provider\"}");
 
         assertThat(objectMapper.readValue(json, DatashareUser.class)).isNotNull();
     }