43 lines
1.6 KiB
JavaScript
43 lines
1.6 KiB
JavaScript
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"use strict";
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var __importDefault = (this && this.__importDefault) || function (mod) {
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return (mod && mod.__esModule) ? mod : { "default": mod };
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.data = void 0;
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const debug_1 = __importDefault(require("debug"));
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const stream_1 = require("stream");
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const crypto_1 = require("crypto");
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const data_uri_to_buffer_1 = require("data-uri-to-buffer");
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const notmodified_1 = __importDefault(require("./notmodified"));
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const debug = (0, debug_1.default)('get-uri:data');
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class DataReadable extends stream_1.Readable {
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constructor(hash, buf) {
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super();
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this.push(buf);
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this.push(null);
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this.hash = hash;
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}
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}
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/**
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* Returns a Readable stream from a "data:" URI.
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*/
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const data = async ({ href: uri }, { cache } = {}) => {
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// need to create a SHA1 hash of the URI string, for cacheability checks
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// in future `getUri()` calls with the same data URI passed in.
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const shasum = (0, crypto_1.createHash)('sha1');
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shasum.update(uri);
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const hash = shasum.digest('hex');
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debug('generated SHA1 hash for "data:" URI: %o', hash);
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// check if the cache is the same "data:" URI that was previously passed in.
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if (cache?.hash === hash) {
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debug('got matching cache SHA1 hash: %o', hash);
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throw new notmodified_1.default();
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}
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else {
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debug('creating Readable stream from "data:" URI buffer');
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const { buffer } = (0, data_uri_to_buffer_1.dataUriToBuffer)(uri);
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return new DataReadable(hash, Buffer.from(buffer));
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}
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};
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exports.data = data;
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//# sourceMappingURL=data.js.map
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