add hw2

node_modules/get-uri/dist/data.js

@@ -0,0 +1,43 @@
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.data = void 0;
+const debug_1 = __importDefault(require("debug"));
+const stream_1 = require("stream");
+const crypto_1 = require("crypto");
+const data_uri_to_buffer_1 = require("data-uri-to-buffer");
+const notmodified_1 = __importDefault(require("./notmodified"));
+const debug = (0, debug_1.default)('get-uri:data');
+class DataReadable extends stream_1.Readable {
+    constructor(hash, buf) {
+        super();
+        this.push(buf);
+        this.push(null);
+        this.hash = hash;
+    }
+}
+/**
+ * Returns a Readable stream from a "data:" URI.
+ */
+const data = async ({ href: uri }, { cache } = {}) => {
+    // need to create a SHA1 hash of the URI string, for cacheability checks
+    // in future `getUri()` calls with the same data URI passed in.
+    const shasum = (0, crypto_1.createHash)('sha1');
+    shasum.update(uri);
+    const hash = shasum.digest('hex');
+    debug('generated SHA1 hash for "data:" URI: %o', hash);
+    // check if the cache is the same "data:" URI that was previously passed in.
+    if (cache?.hash === hash) {
+        debug('got matching cache SHA1 hash: %o', hash);
+        throw new notmodified_1.default();
+    }
+    else {
+        debug('creating Readable stream from "data:" URI buffer');
+        const { buffer } = (0, data_uri_to_buffer_1.dataUriToBuffer)(uri);
+        return new DataReadable(hash, Buffer.from(buffer));
+    }
+};
+exports.data = data;
+//# sourceMappingURL=data.js.map