fix

lab3/node_modules/json-server/lib/cli/utils/is.js

@@ -0,0 +1,16 @@
+"use strict";
+
+module.exports = {
+  FILE,
+  JS,
+  URL
+};
+function FILE(s) {
+  return !URL(s) && /\.json$/.test(s);
+}
+function JS(s) {
+  return !URL(s) && /\.c?js$/.test(s);
+}
+function URL(s) {
+  return /^(http|https):/.test(s);
+}

lab3/node_modules/json-server/lib/cli/utils/load.js

@@ -0,0 +1,69 @@
+"use strict";
+
+const fs = require('fs');
+const path = require('path');
+const http = require('http');
+const https = require('https');
+const low = require('lowdb');
+const FileAsync = require('lowdb/adapters/FileAsync');
+const Memory = require('lowdb/adapters/Memory');
+const is = require('./is');
+const chalk = require('chalk');
+const example = {
+  posts: [{
+    id: 1,
+    title: 'json-server',
+    author: 'typicode'
+  }],
+  comments: [{
+    id: 1,
+    body: 'some comment',
+    postId: 1
+  }],
+  profile: {
+    name: 'typicode'
+  }
+};
+module.exports = function (source) {
+  return new Promise((resolve, reject) => {
+    if (is.FILE(source)) {
+      if (!fs.existsSync(source)) {
+        console.log(chalk.yellow(`  Oops, ${source} doesn't seem to exist`));
+        console.log(chalk.yellow(`  Creating ${source} with some default data`));
+        console.log();
+        fs.writeFileSync(source, JSON.stringify(example, null, 2));
+      }
+      resolve(low(new FileAsync(source)));
+    } else if (is.URL(source)) {
+      // Normalize the source into a URL object.
+      const sourceUrl = new URL(source);
+      // Pick the client based on the protocol scheme
+      const client = sourceUrl.protocol === 'https:' ? https : http;
+      client.get(sourceUrl, res => {
+        let dbData = '';
+        res.on('data', data => {
+          dbData += data;
+        });
+        res.on('end', () => {
+          resolve(low(new Memory()).setState(JSON.parse(dbData)));
+        });
+      }).on('error', error => {
+        return reject(error);
+      });
+    } else if (is.JS(source)) {
+      // Clear cache
+      const filename = path.resolve(source);
+      delete require.cache[filename];
+      const dataFn = require(filename);
+      if (typeof dataFn !== 'function') {
+        throw new Error('The database is a JavaScript file but the export is not a function.');
+      }
+
+      // Run dataFn to generate data
+      const data = dataFn();
+      resolve(low(new Memory()).setState(data));
+    } else {
+      throw new Error(`Unsupported source ${source}`);
+    }
+  });
+};