@versatiles/google-cloud/dist/lib/bucket/metadata.js

A server for VersaTiles in Google Cloud Run

import { createHash } from 'crypto';
import { lookup } from 'mrmime';
export class BucketFileMetadata {
    #header;
    constructor(options = {}) {
        let size;
        if (typeof options.size === 'number') {
            size = String(options.size);
        }
        else {
            size = options.size;
        }
        this.#header = {
            cacheControl: options.cacheControl ?? 'max-age=604800',
            contentType: options.contentType ?? lookup(options.filename ?? '') ?? 'application/octet-stream',
            etag: options.etag ?? this.generateHash(options.filename, options.size, options.mtime),
            size,
        };
    }
    get etag() {
        return this.#header.etag;
    }
    setHeaders(headers) {
        const header = this.#header;
        if (header.size != null)
            headers.set('content-length', header.size);
        if (header.cacheControl != null)
            headers.set('cache-control', header.cacheControl);
        headers.set('etag', header.etag);
        headers.set('content-type', header.contentType);
    }
    toString() {
        return JSON.stringify({
            contentLength: this.#header.size,
            cacheControl: this.#header.cacheControl,
            etag: this.#header.etag,
            contentType: this.#header.contentType,
        });
    }
    generateHash(...args) {
        const hash = createHash('sha256');
        hash.update(args.join(';'));
        return hash.digest('hex');
    }
}