build: fix release scripts (#460)

Author: jooohhn

scripts/readme.js

@@ -0,0 +1,21 @@
+var fs = require('fs');
+var path = require('path');
+
+// Update the README with the minified snippet.
+var cwd = process.cwd();
+var readmeFilename = path.join(cwd, 'README.md');
+var readme = fs.readFileSync(readmeFilename, 'utf-8');
+
+var snippetFilename = path.join(cwd, 'amplitude-snippet.min.js');
+var snippet = fs.readFileSync(snippetFilename, 'utf-8');
+var script =
+  '        <script type="text/javascript">\n' +
+  snippet.trim().replace(/^/gm, '          ') +
+  '\n\n' +
+  '          amplitude.getInstance().init("YOUR_API_KEY_HERE");\n' +
+  '        </script>';
+
+var updated = readme.replace(/ +<script[\s\S]+?script>/, script);
+fs.writeFileSync(readmeFilename, updated);
+
+console.log('Updated README.md');

scripts/release.js

@@ -0,0 +1,22 @@
+var fs = require('fs-extra');
+var path = require('path');
+const { version } = require('../package');
+var exec = require('child_process').exec;
+
+var cwd = process.cwd();
+
+var file = path.join(cwd, 'dist', 'amplitude-' + version + '.js');
+var minfile = path.join(cwd, 'dist', 'amplitude-' + version + '-min.js');
+var mingzfile = path.join(cwd, 'dist', 'amplitude-' + version + '-min.gz.js');
+
+fs.copySync(path.join(cwd, 'amplitude.js'), file);
+fs.copySync(path.join(cwd, 'amplitude.min.js'), minfile);
+exec('gzip < ' + minfile + ' > ' + mingzfile);
+
+const umdFile = path.join(cwd, 'dist', 'amplitude-' + version + '.umd.js');
+const umdMinfile = path.join(cwd, 'dist', 'amplitude-' + version + '-min.umd.js');
+const umdMingzfile = path.join(cwd, 'dist', 'amplitude-' + version + '-min.umd.gz.js');
+
+fs.copySync(path.join(cwd, 'amplitude.umd.js'), umdFile);
+fs.copySync(path.join(cwd, 'amplitude.min.js'), umdMinfile);
+exec('gzip < ' + umdMinfile + ' > ' + umdMingzfile);

scripts/version.js

@@ -0,0 +1,39 @@
+const fs = require('fs');
+const path = require('path');
+const { version } = require('../package');
+const crypto = require('crypto');
+
+const cwd = process.cwd();
+
+function replaceTextInFile(filepath, match, replacement) {
+  var filename = path.join(cwd, filepath);
+
+  const updatedText = fs.readFileSync(filename, 'utf-8').replace(match, replacement);
+
+  if (updatedText.indexOf(replacement) === -1) {
+    throw new Error(`Failed to update text in ${filepath}`);
+  }
+
+  fs.writeFileSync(filename, updatedText);
+
+  console.log(`Updated ${filepath}: ${replacement}`);
+}
+
+// Update version in snippet
+replaceTextInFile(
+  path.join('src', 'amplitude-snippet.js'),
+  /cdn\.amplitude\.com\/libs\/amplitude-[0-9]+\.[0-9]+\.[0-9]+-min\.gz\.js/,
+  `cdn.amplitude.com/libs/amplitude-${version}-min.gz.js`,
+);
+
+// Update integrity hash in snippet
+// Provides extra layer of security. If script changes, it will fail to load
+const sdkText = fs.readFileSync(path.join('.', `amplitude.min.js`), 'utf-8');
+const hash = crypto.createHash('sha384').update(sdkText).digest('base64');
+replaceTextInFile(
+  path.join('src', 'amplitude-snippet.js'),
+  /as.integrity = 'sha384-[a-zA-Z0-9+/]+';/,
+  `as.integrity = 'sha384-${hash}';`,
+);
+
+console.log(`Updated version to ${version}`);