@nestjs/common/pipes/file/max-file-size.validator.js

Nest - modern, fast, powerful node.js web framework (@common)

import { FileValidator } from './file-validator.interface.js';
/**
 * Defines the built-in MaxSize File Validator
 *
 * @see [File Validators](https://docs.nestjs.com/techniques/file-upload#file-validation)
 *
 * @publicApi
 */
export class MaxFileSizeValidator extends FileValidator {
    buildErrorMessage(file) {
        const { errorMessage, message, ...config } = this.validationOptions;
        if (errorMessage) {
            return typeof errorMessage === 'function'
                ? errorMessage({ file, config })
                : errorMessage;
        }
        if (message) {
            return typeof message === 'function'
                ? message(this.validationOptions.maxSize)
                : message;
        }
        if (file?.size) {
            return `Validation failed (current file size is ${file.size}, expected size is less than ${this.validationOptions.maxSize})`;
        }
        return `Validation failed (expected size is less than ${this.validationOptions.maxSize})`;
    }
    isValid(file) {
        if (!this.validationOptions || !file) {
            return true;
        }
        return 'size' in file && file.size < this.validationOptions.maxSize;
    }
}