Only allow null filter operators for fields with "conceal" special

api/src/services/graphql/index.ts

@@ -401,7 +401,10 @@ export class GraphQLService {
 				CollectionTypes[collection.collection] = schemaComposer.createObjectTC({
 					name: action === 'read' ? collection.collection : `${action}_${collection.collection}`,
 					fields: Object.values(collection.fields).reduce((acc, field) => {
-						let type: GraphQLScalarType | GraphQLNonNull<GraphQLNullableType> = getGraphQLType(field.type);
+						let type: GraphQLScalarType | GraphQLNonNull<GraphQLNullableType> = getGraphQLType(
+							field.type,
+							field.special
+						);
 
 						// GraphQL doesn't differentiate between not-null and has-to-be-submitted. We
 						// can't non-null in update, as that would require every not-nullable field to be
@@ -792,7 +795,7 @@ export class GraphQLService {
 				ReadableCollectionFilterTypes[collection.collection] = schemaComposer.createInputTC({
 					name: `${collection.collection}_filter`,
 					fields: Object.values(collection.fields).reduce((acc, field) => {
-						const graphqlType = getGraphQLType(field.type);
+						const graphqlType = getGraphQLType(field.type, field.special);
 
 						let filterOperatorType: InputTypeComposer;
 
@@ -855,7 +858,7 @@ export class GraphQLService {
 				AggregatedFields[collection.collection] = schemaComposer.createObjectTC({
 					name: `${collection.collection}_aggregated_fields`,
 					fields: Object.values(collection.fields).reduce((acc, field) => {
-						const graphqlType = getGraphQLType(field.type);
+						const graphqlType = getGraphQLType(field.type, field.special);
 
 						switch (graphqlType) {
 							case GraphQLInt:
@@ -905,7 +908,7 @@ export class GraphQLService {
 				};
 
 				const hasNumericAggregates = Object.values(collection.fields).some((field) => {
-					const graphqlType = getGraphQLType(field.type);
+					const graphqlType = getGraphQLType(field.type, field.special);
 
 					if (graphqlType === GraphQLInt || graphqlType === GraphQLFloat) {
 						return true;
@@ -2242,7 +2245,9 @@ export class GraphQLService {
 					name: 'directus_collections_meta',
 					fields: Object.values(schema.read.collections['directus_collections'].fields).reduce((acc, field) => {
 						acc[field.field] = {
-							type: field.nullable ? getGraphQLType(field.type) : GraphQLNonNull(getGraphQLType(field.type)),
+							type: field.nullable
+								? getGraphQLType(field.type, field.special)
+								: GraphQLNonNull(getGraphQLType(field.type, field.special)),
 							description: field.note,
 						};
 
@@ -2297,7 +2302,9 @@ export class GraphQLService {
 					name: 'directus_fields_meta',
 					fields: Object.values(schema.read.collections['directus_fields'].fields).reduce((acc, field) => {
 						acc[field.field] = {
-							type: field.nullable ? getGraphQLType(field.type) : GraphQLNonNull(getGraphQLType(field.type)),
+							type: field.nullable
+								? getGraphQLType(field.type, field.special)
+								: GraphQLNonNull(getGraphQLType(field.type, field.special)),
 							description: field.note,
 						};
 
@@ -2388,7 +2395,7 @@ export class GraphQLService {
 					name: 'directus_relations_meta',
 					fields: Object.values(schema.read.collections['directus_relations'].fields).reduce((acc, field) => {
 						acc[field.field] = {
-							type: getGraphQLType(field.type),
+							type: getGraphQLType(field.type, field.special),
 							description: field.note,
 						};
 

api/src/utils/apply-query.ts

@@ -369,14 +369,16 @@ export function applyFilter(
 
 					validateFilterOperator(
 						schema.collections[targetCollection].fields[stripFunction(filterPath[filterPath.length - 1])].type,
-						filterOperator
+						filterOperator,
+						schema.collections[targetCollection].fields[stripFunction(filterPath[filterPath.length - 1])].special
 					);
 
 					applyFilterToQuery(columnPath, filterOperator, filterValue, logical, targetCollection);
 				} else {
 					validateFilterOperator(
 						schema.collections[collection].fields[stripFunction(filterPath[0])].type,
-						filterOperator
+						filterOperator,
+						schema.collections[collection].fields[stripFunction(filterPath[0])].special
 					);
 
 					applyFilterToQuery(`${collection}.${filterPath[0]}`, filterOperator, filterValue, logical);
@@ -415,7 +417,7 @@ export function applyFilter(
 			}
 		}
 
-		function validateFilterOperator(type: Type, filterOperator: string) {
+		function validateFilterOperator(type: Type, filterOperator: string, special: string[]) {
 			if (filterOperator.startsWith('_')) {
 				filterOperator = filterOperator.slice(1);
 			}
@@ -425,6 +427,15 @@ export function applyFilter(
 					`"${type}" field type does not contain the "_${filterOperator}" filter operator`
 				);
 			}
+
+			if (
+				special.includes('conceal') &&
+				!getFilterOperatorsForType('hash').includes(filterOperator as ClientFilterOperator)
+			) {
+				throw new InvalidQueryException(
+					`Field with "conceal" special does not allow the "_${filterOperator}" filter operator`
+				);
+			}
 		}
 
 		function applyFilterToQuery(

api/src/utils/get-graphql-type.ts

@@ -13,7 +13,14 @@ import { GraphQLGeoJSON } from '../services/graphql/types/geojson';
 import { Type } from '@directus/shared/types';
 import { GraphQLHash } from '../services/graphql/types/hash';
 
-export function getGraphQLType(localType: Type | 'alias' | 'unknown'): GraphQLScalarType | GraphQLList<GraphQLType> {
+export function getGraphQLType(
+	localType: Type | 'alias' | 'unknown',
+	special: string[]
+): GraphQLScalarType | GraphQLList<GraphQLType> {
+	if (special.includes('conceal')) {
+		return GraphQLHash;
+	}
+
 	switch (localType) {
 		case 'boolean':
 			return GraphQLBoolean;

tests-blackbox/routes/items/conceal-filter.seed.ts

@@ -0,0 +1,132 @@
+import vendors from '@common/get-dbs-to-test';
+import {
+	CreateCollection,
+	CreateField,
+	CreateFieldO2M,
+	CreateItem,
+	DeleteCollection,
+	PRIMARY_KEY_TYPES,
+} from '@common/index';
+import { v4 as uuid } from 'uuid';
+
+export const collectionFirst = 'test_items_conceal_filter_first';
+export const collectionSecond = 'test_items_conceal_filter_second';
+
+export type First = {
+	id?: number | string;
+	string_field?: string;
+};
+
+export type Second = {
+	id?: number | string;
+	string_field?: string;
+	first_id?: number | string | null;
+};
+
+export const seedDBStructure = () => {
+	it.each(vendors)(
+		'%s',
+		async (vendor) => {
+			for (const pkType of PRIMARY_KEY_TYPES) {
+				try {
+					const localCollectionFirst = `${collectionFirst}_${pkType}`;
+					const localCollectionSecond = `${collectionSecond}_${pkType}`;
+
+					// Delete existing collections
+					await DeleteCollection(vendor, { collection: localCollectionSecond });
+					await DeleteCollection(vendor, { collection: localCollectionFirst });
+
+					// Create first collection
+					await CreateCollection(vendor, {
+						collection: localCollectionFirst,
+						primaryKeyType: pkType,
+					});
+
+					await CreateField(vendor, {
+						collection: localCollectionFirst,
+						field: 'string_field',
+						type: 'string',
+						meta: {
+							special: ['conceal'],
+						},
+					});
+
+					// Create seconds collection
+					await CreateCollection(vendor, {
+						collection: localCollectionSecond,
+						primaryKeyType: pkType,
+					});
+
+					await CreateField(vendor, {
+						collection: localCollectionSecond,
+						field: 'string_field',
+						type: 'string',
+						meta: {
+							special: ['conceal'],
+						},
+					});
+
+					await CreateFieldO2M(vendor, {
+						collection: localCollectionFirst,
+						field: 'second_ids',
+						primaryKeyType: pkType,
+						otherCollection: localCollectionSecond,
+						otherField: 'first_id',
+					});
+
+					expect(true).toBeTruthy();
+				} catch (error) {
+					expect(error).toBeFalsy();
+				}
+			}
+		},
+		300000
+	);
+};
+
+export const seedDBValues = async () => {
+	let isSeeded = true;
+	await Promise.all(
+		vendors.map(async (vendor) => {
+			for (const pkType of PRIMARY_KEY_TYPES) {
+				const localCollectionFirst = `${collectionFirst}_${pkType}`;
+
+				// Create nested items with string value
+				await CreateItem(vendor, {
+					collection: localCollectionFirst,
+					item: {
+						id: pkType === 'string' ? uuid() : undefined,
+						string_field: uuid(),
+						second_ids: [
+							{
+								id: pkType === 'string' ? uuid() : undefined,
+								string_field: uuid(),
+							},
+						],
+					},
+				});
+
+				// Create nested items without string value
+				await CreateItem(vendor, {
+					collection: localCollectionFirst,
+					item: {
+						id: pkType === 'string' ? uuid() : undefined,
+						second_ids: [
+							{
+								id: pkType === 'string' ? uuid() : undefined,
+							},
+						],
+					},
+				});
+			}
+		})
+	)
+		.then(() => {
+			isSeeded = true;
+		})
+		.catch(() => {
+			isSeeded = false;
+		});
+
+	return isSeeded;
+};