feat: added hasDownloadOriginalButton option

Author: titanism

README.md

@@ -133,6 +133,7 @@ NODE_DEBUG=preview-email node app.js
   * `openSimulator` (Boolean) - whether or not to open the iOS Simulator with the preview url file path (defaults to `true` via `process.env.NODE_ENV !== 'test'` and will only run if macOS detected and not in a CI environment)
   * `simpleParser` (Object) - an options Object to pass to `mailparser`'s `simpleParser` method (see [mailparser docs](https://nodemailer.com/extras/mailparser/#options) for available options – note that `Iconv` option is always overridden for safeguard)
   * `returnHTML` (Boolean) - whether or not to return HTML only – and subsequently not write nor open the file preview file (defaults to `false`)
+  * `hasDownloadOriginalButton` (Boolean) - whether or not to render a "Download Original" button to download via base64 inline onclick JavaScript (defaults to `true`)
 
 
 ## License

index.js

@@ -38,6 +38,7 @@ const previewEmail = async (message, options) => {
     returnHTML: false,
     // <https://nodemailer.com/extras/mailparser/#options>
     simpleParser: {},
+    hasDownloadOriginalButton: true,
     ...options
   };
 
@@ -47,20 +48,22 @@ const previewEmail = async (message, options) => {
   let base64;
   if (Buffer.isBuffer(message)) {
     raw = message;
-    base64 = message.toString('base64');
+    if (options.hasDownloadOriginalButton) base64 = message.toString('base64');
   } else if (typeof message === 'string') {
     raw = message;
-    base64 = Buffer.from(message).toString('base64');
+    if (options.hasDownloadOriginalButton)
+      base64 = Buffer.from(message).toString('base64');
   } else if (typeof message === 'object') {
     const response = await transport.sendMail(message);
     raw = response.message;
-    base64 = Buffer.from(response.message).toString('base64');
+    if (options.hasDownloadOriginalButton)
+      base64 = Buffer.from(response.message).toString('base64');
   } else {
     throw new TypeError('Message argument is required');
   }
 
   const parsed = await simpleParser(raw, options.simpleParser);
-  parsed.base64 = base64;
+  if (options.hasDownloadOriginalButton) parsed.base64 = base64;
 
   const html = await renderFilePromise(
     options.template,

template.pug

@@ -113,9 +113,9 @@ html
         input(type='radio', name='preview_email', checked)#tab-html
         label(for='tab-html') HTML
         .preview-email-tab
-          iframe(sandbox, referrerpolicy='no-referrer', seamless='seamless', srcdoc=`<base target='_top'>${html}`)#html
+          iframe(sandbox='', referrerpolicy='no-referrer', seamless='seamless', srcdoc=`<base target='_top'>${html}`)#html
       if text
         input(type='radio', name='preview_email', checked=!html)#tab-text
         label(for='tab-text') Plain text
         .preview-email-tab
-          iframe(sandbox, referrerpolicy='no-referrer', seamless='seamless', srcdoc=`<pre>${text}</pre>`)#text
+          iframe(sandbox='', referrerpolicy='no-referrer', seamless='seamless', srcdoc=`<pre>${text}</pre>`)#text