Created
March 15, 2021 21:56
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Custom validator with decarator
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| enum ValidationTypes { | |
| 'required' = 'required', | |
| 'positive' = 'positive', | |
| 'number' = 'number' | |
| } | |
| interface ValidatorConfig { | |
| [property: string]: { | |
| [validatableProp: string]: string[]; | |
| } | |
| } | |
| let registiredConfig: ValidatorConfig = {}; | |
| function addValidator(target: any, property_name: string, type: ValidationTypes) { | |
| const validator_items = registiredConfig[target.constructor.name]?.[property_name] ?? [] | |
| registiredConfig[target.constructor.name] = { | |
| ...registiredConfig[target.constructor.name], | |
| [property_name]: [...validator_items, type] | |
| } | |
| } | |
| const IsRequire = (target: any, property_name: string) => addValidator(target, property_name, ValidationTypes.required); | |
| const IsNumber = (target: any, property_name: string) => addValidator(target, property_name, ValidationTypes.number); | |
| const PositiveNumber = (target: any, property_name: string) => addValidator(target, property_name, ValidationTypes.positive); | |
| const validate = (obj: any): { status: boolean, list: string[] } => { | |
| let error_list: string[] = []; | |
| const objValidatorConfig = registiredConfig[obj.constructor.name]; | |
| if (!objValidatorConfig) { | |
| return { status: true, list: error_list }; | |
| } | |
| let validation_status = true; | |
| Object.keys(objValidatorConfig).map((class_key) => { | |
| objValidatorConfig[class_key].map((validator_string) => { | |
| console.log("Validator Type:", validator_string, " Key:", class_key, " Value:", obj[class_key]) | |
| switch (validator_string) { | |
| case ValidationTypes.required: | |
| let required_check = !!obj[class_key]; | |
| if (!required_check) { | |
| error_list.push(`${class_key} couldn't meet the requirement to ${validator_string}. Value:${obj[class_key]}`) | |
| } | |
| validation_status = validation_status && required_check; | |
| break; | |
| case ValidationTypes.positive: | |
| let positive_check = obj[class_key] > 0; | |
| if (!positive_check) { | |
| error_list.push(`${class_key} couldn't meet the requirement to ${validator_string}. Value:${obj[class_key]}`) | |
| } | |
| validation_status = validation_status && positive_check; | |
| break; | |
| case ValidationTypes.number: | |
| let number_check = typeof obj[class_key] === "number"; | |
| if (!number_check) { | |
| error_list.push(`${class_key} couldn't meet the requirement to ${validator_string}. Value:${obj[class_key]}`) | |
| } | |
| validation_status = validation_status && number_check; | |
| break; | |
| } | |
| }) | |
| }) | |
| return { status: validation_status, list: error_list } | |
| } | |
| class Course { | |
| @IsRequire | |
| name: string; | |
| @PositiveNumber | |
| @IsNumber | |
| price: number; | |
| constructor(name: string, price: number) { | |
| this.name = name; | |
| this.price = price; | |
| } | |
| } | |
| let example_course = new Course("", 15); | |
| let validate_course = validate(example_course); | |
| if (!validate_course.status) { | |
| console.log("ERROR:", validate_course.list) | |
| } else { | |
| console.log("Validated"); | |
| //Continue | |
| } | |
| /* Example Output | |
| Validator Type: required Key: name Value: | |
| Validator Type: number Key: price Value: 15 | |
| Validator Type: positive Key: price Value: 15 | |
| ERROR: [ "name couldn't meet the requirement to required. Value:" ] */ |
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