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express-server/node_modules/package-json/index.js

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+'use strict';
+const url = require('url');
+const got = require('got');
+const registryUrl = require('registry-url');
+const registryAuthToken = require('registry-auth-token');
+const semver = require('semver');
+
+module.exports = (name, opts) => {
+	const scope = name.split('/')[0];
+	const regUrl = registryUrl(scope);
+	const pkgUrl = url.resolve(regUrl, encodeURIComponent(name).replace(/^%40/, '@'));
+	const authInfo = registryAuthToken(regUrl, {recursive: true});
+
+	opts = Object.assign({
+		version: 'latest'
+	}, opts);
+
+	const headers = {
+		accept: 'application/vnd.npm.install-v1+json; q=1.0, application/json; q=0.8, */*'
+	};
+
+	if (opts.fullMetadata) {
+		delete headers.accept;
+	}
+
+	if (authInfo) {
+		headers.authorization = `${authInfo.type} ${authInfo.token}`;
+	}
+
+	return got(pkgUrl, {json: true, headers})
+		.then(res => {
+			let data = res.body;
+			let version = opts.version;
+
+			if (opts.allVersions) {
+				return data;
+			}
+
+			if (data['dist-tags'][version]) {
+				data = data.versions[data['dist-tags'][version]];
+			} else if (version) {
+				if (!data.versions[version]) {
+					const versions = Object.keys(data.versions);
+					version = semver.maxSatisfying(versions, version);
+
+					if (!version) {
+						throw new Error('Version doesn\'t exist');
+					}
+				}
+
+				data = data.versions[version];
+
+				if (!data) {
+					throw new Error('Version doesn\'t exist');
+				}
+			}
+
+			return data;
+		})
+		.catch(err => {
+			if (err.statusCode === 404) {
+				throw new Error(`Package \`${name}\` doesn't exist`);
+			}
+
+			throw err;
+		});
+};