nestjs-minio-backend/dist/interceptors/file.interceptor.js

NestJS module for MinIO integration

"use strict";
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
    return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __metadata = (this && this.__metadata) || function (k, v) {
    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
var MinioFileInterceptor_1;
Object.defineProperty(exports, "__esModule", { value: true });
exports.MinioFileInterceptor = void 0;
const common_1 = require("@nestjs/common");
const rxjs_1 = require("rxjs");
const minio_service_1 = require("../minio.service");
const operators_1 = require("rxjs/operators");
let MinioFileInterceptor = MinioFileInterceptor_1 = class MinioFileInterceptor {
    constructor(minioService) {
        this.minioService = minioService;
        this.logger = new common_1.Logger(MinioFileInterceptor_1.name);
    }
    intercept(context, next) {
        const request = context.switchToHttp().getRequest();
        const files = request.files || {};
        const handler = context.getHandler();
        const fileFieldsConfig = Reflect.getMetadata('fileField', handler) || [];
        let fileProcessingPromise = Promise.resolve({});
        for (const fieldConfig of fileFieldsConfig) {
            const fieldName = fieldConfig.name;
            const fieldFiles = files[fieldName];
            if (fieldFiles && fieldFiles.length > 0) {
                const file = fieldFiles[0];
                const bucketName = fieldConfig.bucketName;
                if (!bucketName) {
                    throw new Error(`Bucket name is required for file field ${fieldName}`);
                }
                fileProcessingPromise = fileProcessingPromise.then(async (processedData) => {
                    try {
                        this.validateFile(file, fieldConfig);
                        const fileUrl = await this.minioService.uploadFile(file, bucketName);
                        return { ...processedData, [fieldName]: fileUrl };
                    }
                    catch (error) {
                        if (error instanceof common_1.BadRequestException) {
                            throw error;
                        }
                        if (fieldConfig.required) {
                            throw new Error(`Failed to upload required file for ${fieldName}`);
                        }
                        return processedData;
                    }
                });
            }
            else if (fieldConfig.required) {
                throw new Error(`Required file ${fieldName} is missing`);
            }
        }
        return new rxjs_1.Observable((subscriber) => {
            fileProcessingPromise
                .then((processedFiles) => {
                request.body = {
                    ...request.body,
                    ...processedFiles,
                };
                return next
                    .handle()
                    .pipe((0, operators_1.map)(async (data) => {
                    if (Array.isArray(data)) {
                        return Promise.all(data.map((item) => this.transformUrls(item)));
                    }
                    return this.transformUrls(data);
                }))
                    .subscribe(subscriber);
            })
                .catch((error) => {
                subscriber.error(error);
            });
        });
    }
    async transformUrls(data) {
        if (!data)
            return data;
        const obj = data.toJSON ? await data.toJSON() : data;
        for (const [key, value] of Object.entries(obj)) {
            if (typeof value === 'string' && value.includes('/')) {
                const [bucketName, ...pathParts] = value.split('/');
                if (pathParts.length > 0) {
                    try {
                        obj[key] = await this.minioService.getPresignedUrl(bucketName, pathParts.join('/'));
                    }
                    catch (error) {
                        this.logger.error(`Error generating presigned URL for ${key}:`, error);
                    }
                }
            }
        }
        return obj;
    }
    validateFile(file, config) {
        const validationConfig = {
            allowedMimeTypes: config.allowedMimeTypes || [],
            maxSize: config.maxSize,
            required: config.required,
        };
        if (validationConfig.maxSize && file.size > validationConfig.maxSize) {
            throw new common_1.BadRequestException(`File ${file.originalname} exceeds maximum size of ${validationConfig.maxSize / 1024 / 1024}MB`);
        }
        if (validationConfig.allowedMimeTypes.length > 0) {
            const normalizedMimetype = file.mimetype.toLowerCase();
            const normalizedAllowedTypes = validationConfig.allowedMimeTypes.map((type) => type.toLowerCase());
            if (!normalizedAllowedTypes.includes(normalizedMimetype)) {
                throw new common_1.BadRequestException(`File ${file.originalname} has invalid type. Received: ${file.mimetype}, Allowed types: ${validationConfig.allowedMimeTypes.join(', ')}`);
            }
        }
    }
};
exports.MinioFileInterceptor = MinioFileInterceptor;
exports.MinioFileInterceptor = MinioFileInterceptor = MinioFileInterceptor_1 = __decorate([
    (0, common_1.Injectable)(),
    __metadata("design:paramtypes", [minio_service_1.MinioService])
], MinioFileInterceptor);
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