feat(core): create no default Ajv instance when a Form Validator is set

packages/angular-material/example/app/app.component.ts

@@ -87,6 +87,7 @@ const itemTester: UISchemaTester = (_schema, schemaPath, _path) => {
       [(data)]="selectedExample.data"
       [schema]="selectedExample.schema"
       [uischema]="selectedExample.uischema"
+      [validator]="selectedExample.validator"
       [renderers]="renderers"
       [i18n]="i18n"
       [readonly]="readonly"

packages/angular-material/src/library/layouts/categorization-layout.renderer.ts

@@ -29,7 +29,7 @@ import {
   Category,
   defaultJsonFormsI18nState,
   deriveLabelForUISchemaElement,
-  getAjv,
+  getRuleValidator,
   getConfig,
   isVisible,
   JsonFormsState,
@@ -93,7 +93,7 @@ export class CategorizationTabLayoutRenderer
                 category,
                 props.data,
                 undefined,
-                getAjv(state),
+                getRuleValidator(state),
                 getConfig(state)
               )
           );

packages/angular-material/src/library/other/util.ts

@@ -24,7 +24,7 @@
 */
 import {
   ControlElement,
-  getAjv,
+  getRuleValidator,
   getConfig,
   getData,
   isVisible,
@@ -49,7 +49,7 @@ export const mapStateToVisible = (
           ownProps.uischema,
           getData(state),
           undefined,
-          getAjv(state),
+          getRuleValidator(state),
           getConfig(state)
         );
 

packages/angular/src/library/jsonforms-root.component.ts

@@ -44,6 +44,7 @@ import {
   UISchemaElement,
   UISchemaTester,
   ValidationMode,
+  ValidatorOption,
 } from '@jsonforms/core';
 import type Ajv from 'ajv';
 import type { ErrorObject } from 'ajv';
@@ -71,6 +72,7 @@ export class JsonForms implements DoCheck, OnChanges, OnInit, OnDestroy {
   @Input() readonly: boolean;
   @Input() validationMode: ValidationMode;
   @Input() ajv: Ajv;
+  @Input() validator: ValidatorOption;
   @Input() config: JsonFormsAngularConfig;
   @Input() i18n: JsonFormsI18nState;
   @Input() additionalErrors: ErrorObject[];
@@ -95,6 +97,7 @@ export class JsonForms implements DoCheck, OnChanges, OnInit, OnDestroy {
           uischema: this.uischema,
           schema: this.schema,
           ajv: this.ajv,
+          validatorOption: this.validator,
           validationMode: this.validationMode,
           additionalErrors: this.additionalErrors,
         },
@@ -160,6 +163,7 @@ export class JsonForms implements DoCheck, OnChanges, OnInit, OnDestroy {
     const newReadonly = changes.readonly;
     const newValidationMode = changes.validationMode;
     const newAjv = changes.ajv;
+    const newValidator = changes.validator;
     const newConfig = changes.config;
     const newAdditionalErrors = changes.additionalErrors;
 
@@ -169,6 +173,7 @@ export class JsonForms implements DoCheck, OnChanges, OnInit, OnDestroy {
       newUiSchema ||
       newValidationMode ||
       newAjv ||
+      newValidator ||
       newAdditionalErrors
     ) {
       this.jsonformsService.updateCoreState(
@@ -177,7 +182,10 @@ export class JsonForms implements DoCheck, OnChanges, OnInit, OnDestroy {
         newUiSchema ? newUiSchema.currentValue : USE_STATE_VALUE,
         newAjv ? newAjv.currentValue : USE_STATE_VALUE,
         newValidationMode ? newValidationMode.currentValue : USE_STATE_VALUE,
-        newAdditionalErrors ? newAdditionalErrors.currentValue : USE_STATE_VALUE
+        newAdditionalErrors
+          ? newAdditionalErrors.currentValue
+          : USE_STATE_VALUE,
+        newValidator ? newValidator.currentValue : USE_STATE_VALUE
       );
     }
 

packages/angular/src/library/jsonforms.service.ts

@@ -46,6 +46,7 @@ import {
   updateI18n,
   Middleware,
   defaultMiddleware,
+  ValidatorOption,
 } from '@jsonforms/core';
 import { BehaviorSubject, Observable } from 'rxjs';
 import type { JsonFormsBaseRenderer } from './base.renderer';
@@ -293,7 +294,8 @@ export class JsonFormsAngularService {
     uischema: UISchemaElement | typeof USE_STATE_VALUE,
     ajv: Ajv | typeof USE_STATE_VALUE,
     validationMode: ValidationMode | typeof USE_STATE_VALUE,
-    additionalErrors: ErrorObject[] | typeof USE_STATE_VALUE
+    additionalErrors: ErrorObject[] | typeof USE_STATE_VALUE,
+    validator: ValidatorOption | typeof USE_STATE_VALUE = USE_STATE_VALUE
   ): void {
     const newData = data === USE_STATE_VALUE ? this._state.core.data : data;
     const newSchema =
@@ -313,9 +315,14 @@ export class JsonFormsAngularService {
       additionalErrors === USE_STATE_VALUE
         ? this._state.core.additionalErrors
         : additionalErrors;
+    const newValidator =
+      validator === USE_STATE_VALUE
+        ? this._state.core.validatorOption
+        : validator;
     this.updateCore(
       Actions.updateCore(newData, newSchema, newUischema, {
         ajv: newAjv,
+        validator: newValidator,
         validationMode: newValidationMode,
         additionalErrors: newAdditionalErrors,
       })

packages/core/src/actions/actions.ts

@@ -25,6 +25,7 @@
 
 import type AJV from 'ajv';
 import type { ErrorObject } from 'ajv';
+import type { ValidatorOption } from '../util/formValidator';
 import { JsonSchema, UISchemaElement } from '../models';
 import { generateDefaultUISchema, generateJsonSchema } from '../generators';
 
@@ -145,7 +146,15 @@ export interface UpdateCoreAction {
 }
 
 export interface InitActionOptions {
+  /** The AJV instance to validate with. Ignored for form validation when `validator` is set. */
   ajv?: AJV;
+  /**
+   * A custom Form Validator: a factory producing one per schema, or a
+   * validator already bound to the schema. Takes precedence over `ajv`.
+   * Passing `undefined` explicitly switches back to AJV; leaving the key out
+   * keeps the validator currently in use.
+   */
+  validator?: ValidatorOption;
   validationMode?: ValidationMode;
   additionalErrors?: ErrorObject[];
 }

packages/core/src/mappers/cell.ts

@@ -45,7 +45,7 @@ import type { JsonSchema } from '../models';
 import {
   AnyAction,
   Dispatch,
-  getAjv,
+  getRuleValidator,
   getConfig,
   getData,
   getErrorAt,
@@ -116,7 +116,13 @@ export const mapStateToCellProps = (
   const visible =
     ownProps.visible !== undefined
       ? ownProps.visible
-      : isVisible(uischema, rootData, undefined, getAjv(state), config);
+      : isVisible(
+          uischema,
+          rootData,
+          undefined,
+          getRuleValidator(state),
+          config
+        );
 
   const rootSchema = getSchema(state);
 

packages/core/src/mappers/renderer.ts

@@ -72,7 +72,7 @@ import {
 } from '../util';
 import {
   Translator,
-  getAjv,
+  getRuleValidator,
   getCells,
   getConfig,
   getData,
@@ -84,6 +84,7 @@ import {
   getUiSchema,
 } from '../store';
 import { isInherentlyEnabled, isInherentlyReadonly } from './util';
+import { isStructuralMatch } from '../util/structural';
 import { CombinatorKeyword } from './combinators';
 import isEqual from 'lodash/isEqual';
 
@@ -596,7 +597,13 @@ export const mapStateToControlProps = (
 
   const visible: boolean =
     ownProps.visible === undefined || hasShowRule(uischema)
-      ? isVisible(uischema, rootData, ownProps.path, getAjv(state), config)
+      ? isVisible(
+          uischema,
+          rootData,
+          ownProps.path,
+          getRuleValidator(state),
+          config
+        )
       : ownProps.visible;
   const controlElement = uischema as ControlElement;
   const id = ownProps.id;
@@ -1066,7 +1073,7 @@ export const mapStateToLayoutProps = (
           ownProps.uischema,
           rootData,
           ownProps.path,
-          getAjv(state),
+          getRuleValidator(state),
           getConfig(state)
         )
       : ownProps.visible;
@@ -1163,41 +1170,14 @@ export const mapStateToCombinatorRendererProps = (
   const { data, schema, rootSchema, i18nKeyPrefix, label, ...props } =
     mapStateToControlProps(state, ownProps);
 
-  const ajv = state.jsonforms.core.ajv;
-  const structuralKeywords = [
-    'required',
-    'additionalProperties',
-    'type',
-    'enum',
-    'const',
-  ];
-  const dataIsValid = (errors: ErrorObject[]): boolean => {
-    return (
-      !errors ||
-      errors.length === 0 ||
-      !errors.find((e) => structuralKeywords.indexOf(e.keyword) !== -1)
-    );
-  };
+  // Pick the first branch whose structural keywords fit the data. This is a
+  // pure structural check (see isStructuralMatch): no validator instance and
+  // no code generation are involved, so it also works under a strict CSP.
   let indexOfFittingSchema: number;
-  // TODO instead of compiling the combinator subschemas we can compile the original schema
-  // without the combinator alternatives and then revalidate and check the errors for the
-  // element
   for (let i = 0; i < schema[keyword]?.length; i++) {
-    try {
-      let _schema = schema[keyword][i];
-      if (_schema.$ref) {
-        _schema = Resolve.schema(rootSchema, _schema.$ref, rootSchema);
-      }
-      const valFn = ajv.compile(_schema);
-      valFn(data);
-      if (dataIsValid(valFn.errors)) {
-        indexOfFittingSchema = i;
-        break;
-      }
-    } catch (error) {
-      console.debug(
-        "Combinator subschema is not self contained, can't hand it over to AJV"
-      );
+    if (isStructuralMatch(schema[keyword][i], data, rootSchema)) {
+      indexOfFittingSchema = i;
+      break;
     }
   }
 
@@ -1319,7 +1299,7 @@ export const mapStateToLabelProps = (
           props.uischema,
           getData(state),
           props.path,
-          getAjv(state),
+          getRuleValidator(state),
           getConfig(state)
         )
       : props.visible;

packages/core/src/mappers/util.ts

@@ -1,5 +1,5 @@
 import { JsonSchema, UISchemaElement } from '../models';
-import { JsonFormsState, getAjv } from '../store';
+import { JsonFormsState, getRuleValidator } from '../store';
 import { hasEnableRule, hasReadonlyRule, isEnabled, isReadonly } from '../util';
 
 /**
@@ -19,7 +19,13 @@ export const isInherentlyEnabled = (
     return false;
   }
   if (uischema && hasEnableRule(uischema)) {
-    return isEnabled(uischema, rootData, ownProps?.path, getAjv(state), config);
+    return isEnabled(
+      uischema,
+      rootData,
+      ownProps?.path,
+      getRuleValidator(state),
+      config
+    );
   }
   if (!config?.separateReadonlyFromDisabled) {
     if (typeof uischema?.options?.readonly === 'boolean') {
@@ -66,7 +72,7 @@ export const isInherentlyReadonly = (
       uischema,
       rootData,
       ownProps?.path,
-      getAjv(state),
+      getRuleValidator(state),
       config
     );
   }