53 lines
2.3 KiB
JavaScript
53 lines
2.3 KiB
JavaScript
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"use strict";
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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
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function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
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return new (P || (P = Promise))(function (resolve, reject) {
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function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
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function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
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function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
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step((generator = generator.apply(thisArg, _arguments || [])).next());
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});
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};
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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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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 = __importDefault(require("data-uri-to-buffer"));
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const notmodified_1 = __importDefault(require("./notmodified"));
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const debug = 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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function get({ href: uri }, { cache }) {
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return __awaiter(this, void 0, void 0, function* () {
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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 = 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 && 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 buf = data_uri_to_buffer_1.default(uri);
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return new DataReadable(hash, buf);
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}
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});
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}
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exports.default = get;
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//# sourceMappingURL=data.js.map
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