MIME Email Parser for Gmail Auto-Draft Extension

This component allows the Gmail Auto-Draft extension to parse raw MIME emails and extract their content properly.

Features

Parse raw MIME email content into structured data
Extract headers, plain text content, and HTML content
Support for multipart emails with nested boundaries
Decode quoted-printable and base64 encoded content
Extract sender, recipient, subject, and other metadata

Usage

In the Chrome Extension

Paste Raw MIME Email: In the extension UI, paste the raw MIME email content into the "Raw MIME Email" textarea.
Generate Draft: Click the "Auto-Draft with GPT" button to generate a response based on the parsed email.

In Code

// In content.js
const mimeContent = document.querySelector('.mime-content').value;
if (isMimeEmail(mimeContent)) {
  // Send to background script for parsing
  chrome.runtime.sendMessage({
    action: 'parseMimeEmail',
    mimeContent
  }, response => {
    if (response && response.success) {
      console.log('Parsed email:', response.emailData);
      // Use the parsed email data
    } else {
      console.error('Failed to parse email:', response.error);
    }
  });
}

// In background.js
chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
  if (message.action === 'parseMimeEmail') {
    try {
      const emailData = extractEmailThread(message.mimeContent);
      sendResponse({ success: true, emailData });
    } catch (error) {
      sendResponse({ success: false, error: error.message });
    }
    return true; // async
  }
});

API

`parseMimeEmail(mimeContent)`

Parses a raw MIME email into structured data.

Parameters:

mimeContent (string): The raw MIME content of the email

Returns: Object with properties:

headers: Object containing all email headers
textContent: Plain text content of the email
htmlContent: HTML content of the email (if available)
raw: The original raw MIME content

`extractEmailThread(mimeContent)`

Extracts structured data from a MIME email, including sender, recipient, and content.

Parameters:

mimeContent (string): The raw MIME content of the email

Returns: Object with properties:

subject: Email subject
date: Email date
sender: Object with name and email properties
recipient: Object with name and email properties
content: The email content (HTML if available, otherwise plain text)
cc: CC recipients
bcc: BCC recipients
messageId: Message ID
inReplyTo: In-Reply-To header
references: References header
headers: All email headers
raw: The original raw MIME content

Testing

You can test the parser using the test_parser.js script:

node test_parser.js

This will parse a sample MIME email and output the structured data.

Limitations

The parser handles common MIME formats but may not support all edge cases
Very large emails may cause performance issues
Some complex nested multipart structures may not be fully parsed

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