@decaf-ts/decorator-validation
Version:
simple decorator based validation engine
146 lines • 24.1 kB
JavaScript
import { ModelErrorDefinition } from "./ModelErrorDefinition";
import { Reflection } from "@decaf-ts/reflection";
import { ModelKeys } from "../utils/constants";
import { ReservedModels } from "./constants";
import { VALIDATION_PARENT_KEY } from "../constants";
import { Model } from "./Model";
import { Validation } from "../validation/Validation";
import { ValidationKeys } from "../validation/Validators/constants";
import { PathProxyEngine } from "../utils/PathProxy";
/**
* @summary Analyses the decorations of the properties and validates the obj according to them
*
* @typedef M extends Model
* @prop {M} obj Model object to validate
* @prop {string[]} [propsToIgnore] object properties to ignore in the validation
*
* @function validate
* @memberOf module:decorator-validation
* @category Model
*/
export function validate(obj, ...propsToIgnore) {
const decoratedProperties = [];
for (const prop in obj)
if (Object.prototype.hasOwnProperty.call(obj, prop) &&
propsToIgnore.indexOf(prop) === -1)
decoratedProperties.push(Reflection.getPropertyDecorators(ValidationKeys.REFLECT, obj, prop));
let result = undefined;
for (const decoratedProperty of decoratedProperties) {
const { prop, decorators } = decoratedProperty;
if (!decorators || !decorators.length)
continue;
const defaultTypeDecorator = decorators[0];
// tries to find any type decorators or other decorators that already enforce type (the ones with the allowed types property defined). if so, skip the default type verification
if (decorators.find((d) => {
if (d.key === ValidationKeys.TYPE)
return true;
return !!d.props.types?.find((t) => t === defaultTypeDecorator.props.name);
})) {
decorators.shift(); // remove the design:type decorator, since the type will already be checked
}
let errs = undefined;
for (const decorator of decorators) {
const validator = Validation.get(decorator.key);
if (!validator) {
throw new Error(`Missing validator for ${decorator.key}`);
}
const decoratorProps = decorator.key === ModelKeys.TYPE
? [decorator.props]
: decorator.props || {};
const err = validator.hasErrors(obj[prop.toString()], decoratorProps, PathProxyEngine.create(obj, { ignoreUndefined: true, ignoreNull: true }));
if (err) {
errs = errs || {};
errs[decorator.key] = err;
}
}
if (errs) {
result = result || {};
result[decoratedProperty.prop.toString()] = errs;
}
}
// tests nested classes
for (const prop of Object.keys(obj).filter((k) => !result || !result[k])) {
let err;
// if a nested Model
const allDecorators = Reflection.getPropertyDecorators(ValidationKeys.REFLECT, obj, prop).decorators;
const decorators = Reflection.getPropertyDecorators(ValidationKeys.REFLECT, obj, prop).decorators.filter((d) => [ModelKeys.TYPE, ValidationKeys.TYPE].indexOf(d.key) !== -1);
if (!decorators || !decorators.length)
continue;
const dec = decorators.pop();
const clazz = dec.props.name
? [dec.props.name]
: Array.isArray(dec.props.customTypes)
? dec.props.customTypes
: [dec.props.customTypes];
const reserved = Object.values(ReservedModels).map((v) => v.toLowerCase());
for (const c of clazz) {
if (reserved.indexOf(c.toLowerCase()) === -1) {
const typeDecoratorKey = Array.isArray(obj[prop])
? ValidationKeys.LIST
: ValidationKeys.TYPE;
const types = allDecorators.find((d) => d.key === typeDecoratorKey) || {};
let allowedTypes = [];
if (types && types.props) {
const customTypes = Array.isArray(obj[prop])
? types.props.class
: types.props.customTypes;
if (customTypes)
allowedTypes = Array.isArray(customTypes)
? customTypes.map((t) => `${t}`.toLowerCase())
: [customTypes.toLowerCase()];
}
const validate = (prop, value) => {
if (typeof value !== "object" && typeof value !== "function")
return undefined;
try {
if (value && !value[VALIDATION_PARENT_KEY])
value[VALIDATION_PARENT_KEY] = obj; // TODO: freeze?
return Model.isModel(value)
? value.hasErrors()
: allowedTypes.includes(typeof value)
? undefined
: "Value has no validatable type";
}
finally {
if (value && value[VALIDATION_PARENT_KEY])
delete value[VALIDATION_PARENT_KEY];
}
};
switch (c) {
case Array.name:
case Set.name:
if (allDecorators.length) {
const listDec = allDecorators.find((d) => d.key === ValidationKeys.LIST);
if (listDec) {
err = (c === Array.name
? obj[prop]
: // If it's a Set
obj[prop].values())
.map((v) => validate(prop, v))
.filter((e) => !!e);
if (!err?.length) {
// if the result is an empty list...
err = undefined;
}
}
}
break;
default:
try {
if (obj[prop])
err = validate(prop, obj[prop]);
}
catch (e) {
console.warn(`Model should be validatable but its not: ${e}`);
}
}
}
if (err) {
result = result || {};
result[prop] = err;
}
}
}
return result ? new ModelErrorDefinition(result) : undefined;
}
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{ ModelErrorDefinition } from \"./ModelErrorDefinition\";\nimport { DecoratorMetadata, Reflection } from \"@decaf-ts/reflection\";\nimport { ModelKeys } from \"../utils/constants\";\nimport { ReservedModels } from \"./constants\";\nimport { VALIDATION_PARENT_KEY } from \"../constants\";\nimport { Validatable } from \"./types\";\nimport { Model } from \"./Model\";\nimport { Validation } from \"../validation/Validation\";\nimport { ValidationKeys } from \"../validation/Validators/constants\";\nimport {\n  ModelErrors,\n  ValidationPropertyDecoratorDefinition,\n  ValidatorOptions,\n} from \"../validation/types\";\nimport { PathProxyEngine } from \"../utils/PathProxy\";\n\n/**\n * @summary Analyses the decorations of the properties and validates the obj according to them\n *\n * @typedef M extends Model\n * @prop {M} obj Model object to validate\n * @prop {string[]} [propsToIgnore] object properties to ignore in the validation\n *\n * @function validate\n * @memberOf module:decorator-validation\n * @category Model\n */\nexport function validate<M extends Model>(\n  obj: M,\n  ...propsToIgnore: string[]\n): ModelErrorDefinition | undefined {\n  const decoratedProperties: ValidationPropertyDecoratorDefinition[] = [];\n  for (const prop in obj)\n    if (\n      Object.prototype.hasOwnProperty.call(obj, prop) &&\n      propsToIgnore.indexOf(prop) === -1\n    )\n      decoratedProperties.push(\n        Reflection.getPropertyDecorators(\n          ValidationKeys.REFLECT,\n          obj,\n          prop\n        ) as ValidationPropertyDecoratorDefinition\n      );\n\n  let result: ModelErrors | undefined = undefined;\n\n  for (const decoratedProperty of decoratedProperties) {\n    const { prop, decorators } = decoratedProperty;\n\n    if (!decorators || !decorators.length) continue;\n\n    const defaultTypeDecorator: DecoratorMetadata = decorators[0];\n\n    // tries to find any type decorators or other decorators that already enforce type (the ones with the allowed types property defined). if so, skip the default type verification\n    if (\n      decorators.find((d) => {\n        if (d.key === ValidationKeys.TYPE) return true;\n        return !!d.props.types?.find(\n          (t) => t === defaultTypeDecorator.props.name\n        );\n      })\n    ) {\n      decorators.shift(); // remove the design:type decorator, since the type will already be checked\n    }\n\n    let errs: Record<string, string | undefined> | undefined = undefined;\n\n    for (const decorator of decorators) {\n      const validator = Validation.get(decorator.key);\n      if (!validator) {\n        throw new Error(`Missing validator for ${decorator.key}`);\n      }\n\n      const decoratorProps =\n        decorator.key === ModelKeys.TYPE\n          ? [decorator.props]\n          : decorator.props || {};\n\n      const err: string | undefined = validator.hasErrors(\n        (obj as any)[prop.toString()],\n        decoratorProps as ValidatorOptions,\n        PathProxyEngine.create(obj, { ignoreUndefined: true, ignoreNull: true })\n      );\n\n      if (err) {\n        errs = errs || {};\n        errs[decorator.key] = err;\n      }\n    }\n\n    if (errs) {\n      result = result || {};\n      result[decoratedProperty.prop.toString()] = errs;\n    }\n  }\n\n  // tests nested classes\n  for (const prop of Object.keys(obj).filter((k) => !result || !result[k])) {\n    let err: string | undefined;\n    // if a nested Model\n    const allDecorators = Reflection.getPropertyDecorators(\n      ValidationKeys.REFLECT,\n      obj,\n      prop\n    ).decorators;\n    const decorators = Reflection.getPropertyDecorators(\n      ValidationKeys.REFLECT,\n      obj,\n      prop\n    ).decorators.filter(\n      (d: { key: string }) =>\n        [ModelKeys.TYPE, ValidationKeys.TYPE as string].indexOf(d.key) !== -1\n    );\n    if (!decorators || !decorators.length) continue;\n    const dec = decorators.pop() as DecoratorMetadata;\n    const clazz = dec.props.name\n      ? [dec.props.name]\n      : Array.isArray(dec.props.customTypes)\n        ? dec.props.customTypes\n        : [dec.props.customTypes];\n    const reserved = Object.values(ReservedModels).map((v) =>\n      v.toLowerCase()\n    ) as string[];\n\n    for (const c of clazz) {\n      if (reserved.indexOf(c.toLowerCase()) === -1) {\n        const typeDecoratorKey = Array.isArray((obj as any)[prop])\n          ? ValidationKeys.LIST\n          : ValidationKeys.TYPE;\n        const types: any =\n          allDecorators.find(\n            (d: { key: string }) => d.key === typeDecoratorKey\n          ) || {};\n        let allowedTypes: string[] = [];\n        if (types && types.props) {\n          const customTypes = Array.isArray((obj as any)[prop])\n            ? types.props.class\n            : types.props.customTypes;\n          if (customTypes)\n            allowedTypes = Array.isArray(customTypes)\n              ? customTypes.map((t) => `${t}`.toLowerCase())\n              : [customTypes.toLowerCase()];\n        }\n\n        const validate = (prop: string, value: any): any => {\n          if (typeof value !== \"object\" && typeof value !== \"function\")\n            return undefined;\n\n          try {\n            if (value && !value[VALIDATION_PARENT_KEY])\n              value[VALIDATION_PARENT_KEY] = obj; // TODO: freeze?\n\n            return Model.isModel(value)\n              ? value.hasErrors()\n              : allowedTypes.includes(typeof value)\n                ? undefined\n                : \"Value has no validatable type\";\n          } finally {\n            if (value && value[VALIDATION_PARENT_KEY])\n              delete value[VALIDATION_PARENT_KEY];\n          }\n        };\n\n        switch (c) {\n          case Array.name:\n          case Set.name:\n            if (allDecorators.length) {\n              const listDec = allDecorators.find(\n                (d: { key: string }) => d.key === ValidationKeys.LIST\n              );\n              if (listDec) {\n                err = (\n                  c === Array.name\n                    ? (obj as Record<string, any>)[prop]\n                    : // If it's a Set\n                      (obj as Record<string, any>)[prop].values()\n                )\n                  .map((v: Validatable) => validate(prop, v))\n                  .filter((e: any) => !!e) as any;\n                if (!err?.length) {\n                  // if the result is an empty list...\n                  err = undefined;\n                }\n              }\n            }\n            break;\n          default:\n            try {\n              if ((obj as Record<string, any>)[prop])\n                err = validate(prop, (obj as any)[prop]);\n            } catch (e: unknown) {\n              console.warn(`Model should be validatable but its not: ${e}`);\n            }\n        }\n      }\n      if (err) {\n        result = result || {};\n        result[prop] = err as any;\n      }\n    }\n  }\n\n  return result ? new ModelErrorDefinition(result) : undefined;\n}\n"]}