     1	/**
     2	 * S3 Storage Adapter
     3	 *
     4	 * Stores uploaded files in Amazon S3 or S3-compatible storage.
     5	 *
     6	 * Usage:
     7	 * ```javascript
     8	 * import { S3Storage } from 'jsonrestapi/lib/storage/s3-storage.js';
     9	 *
    10	 * const storage = new S3Storage({
    11	 *   bucket: 'my-uploads',
    12	 *   region: 'us-east-1',
    13	 *   accessKeyId: process.env.AWS_ACCESS_KEY_ID,
    14	 *   secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY,
    15	 *   prefix: 'uploads/' // optional path prefix
    16	 * });
    17	 *
    18	 * const schema = {
    19	 *   image: { type: 'file', storage }
    20	 * };
    21	 * ```
    22	 */
    23	
    24	import crypto from 'crypto'
    25	import path from 'path'
    26	
    27	export class S3Storage {
    28	  constructor (options = {}) {
    29	    this.bucket = options.bucket
    30	    this.region = options.region || 'us-east-1'
    31	    this.prefix = options.prefix || ''
    32	    this.acl = options.acl || 'public-read'
    33	
    34	    if (!this.bucket) {
    35	      throw new Error('S3Storage requires a bucket name')
    36	    }
    37	
    38	    // Note: In a real implementation, you would initialize the AWS SDK here
    39	    // For this example, we'll just mock the behavior
    40	    this.mockMode = options.mockMode !== false // Default to mock mode
    41	
    42	    if (!this.mockMode) {
    43	      // Real S3 initialization would go here
    44	      // const { S3Client } = require('@aws-sdk/client-s3');
    45	      // this.s3 = new S3Client({ region: this.region });
    46	    }
    47	  }
    48	
    49	  /**
    50	   * Upload a file to S3
    51	   * @param {Object} file - File object from detector
    52	   * @returns {Promise<string>} URL of the uploaded file
    53	   */
    54	  async upload (file) {
    55	    // Generate S3 key
    56	    const ext = path.extname(file.filename)
    57	    const hash = crypto.randomBytes(16).toString('hex')
    58	    const key = `${this.prefix}${hash}${ext}`
    59	
    60	    if (this.mockMode) {
    61	      // Mock mode - just return a fake URL
    62	      const url = `https://${this.bucket}.s3.${this.region}.amazonaws.com/${key}`
    63	
    64	      // Simulate upload delay
    65	      await new Promise(resolve => setTimeout(resolve, 100))
    66	
    67	      return url
    68	    }
    69	
    70	    // Real S3 upload would go here
    71	    /*
    72	    const { PutObjectCommand } = require('@aws-sdk/client-s3');
    73	
    74	    const command = new PutObjectCommand({
    75	      Bucket: this.bucket,
    76	      Key: key,
    77	      Body: file.data,
    78	      ContentType: file.mimetype,
    79	      ACL: this.acl,
    80	      Metadata: {
    81	        originalName: file.filename
    82	      }
    83	    });
    84	
    85	    await this.s3.send(command);
    86	
    87	    // Return public URL
    88	    if (this.acl === 'public-read') {
    89	      return `https://${this.bucket}.s3.${this.region}.amazonaws.com/${key}`;
    90	    } else {
    91	      // For private files, you might return a signed URL
    92	      return await this.getSignedUrl(key);
    93	    }
    94	    */
    95	  }
    96	
    97	  /**
    98	   * Delete a file from S3
    99	   * @param {string} url - URL returned by upload()
   100	   * @returns {Promise<void>}
   101	   */
   102	  async delete (url) {
   103	    // Extract key from URL
   104	    const urlObj = new URL(url)
   105	    const key = urlObj.pathname.substring(1) // Remove leading /
   106	
   107	    if (this.mockMode) {
   108	      // Mock mode - just simulate deletion
   109	      await new Promise(resolve => setTimeout(resolve, 50))
   110	    }
   111	
   112	    // Real S3 delete would go here
   113	    /*
   114	    const { DeleteObjectCommand } = require('@aws-sdk/client-s3');
   115	
   116	    const command = new DeleteObjectCommand({
   117	      Bucket: this.bucket,
   118	      Key: key
   119	    });
   120	
   121	    await this.s3.send(command);
   122	    */
   123	  }
   124	}
