feat: Add Google Drive image extraction support

[konard]

Summary

This PR implements support for extracting images from public Google Drive links, as requested in issue #13. The implementation now correctly handles both /view and non-/view URL formats, converting them to direct download links.

Changes Made

1. Core Functionality (src/lib.js):

   • Added convertGoogleDriveUrl() function to detect and convert Google Drive URLs to direct download format
   • Supports multiple URL patterns:
     • https://drive.google.com/file/d/{FILE_ID}/view
     • https://drive.google.com/file/d/{FILE_ID}
     • https://drive.google.com/open?id={FILE_ID}

2. Image Endpoint (src/image.js):

   • Detects Google Drive URLs and directly downloads the image file instead of taking a screenshot
   • Returns the actual image with correct content type

3. HTML Endpoint (src/html.js):

   • For Google Drive images, generates a simple HTML page displaying the image
   • Includes proper styling for image display

4. Markdown Endpoint (src/markdown.js):

   • Fetches content from converted Google Drive URLs
   • Converts the response to markdown format

Testing

• Unit Tests (tests/unit/convertGoogleDriveUrl.test.js):

  • 11 comprehensive tests covering URL conversion logic
  • Tests for edge cases (null, undefined, empty strings)
  • Tests for various URL formats

• E2E Tests (tests/e2e/google-drive.test.js):

  • 12 end-to-end tests covering all three endpoints
  • Tests both example URLs from the issue
  • Tests both /view and non-/view formats

Test Results

All tests passing locally:

Test Suites: 7 passed, 7 total (excluding docker tests)
Tests:       71 passed, 71 total

Specifically for Google Drive:

• ✅ Unit tests: 11/11 passing
• ✅ E2E tests: 12/12 passing (4 per endpoint × 3 endpoints)

Verified Functionality

Tested with the exact URLs from issue #13:

• ✅ https://drive.google.com/file/d/1Cxkx6-428EQAX0-eiaq66H829ohnPp7q/view
• ✅ https://drive.google.com/file/d/1Cxkx6-428EQAX0-eiaq66H829ohnPp7q (without /view)
• ✅ https://drive.google.com/file/d/1fgJaftjv53xCN7vgiJOaQlbfWkUqPgyd/view
• ✅ https://drive.google.com/file/d/1fgJaftjv53xCN7vgiJOaQlbfWkUqPgyd (without /view)

All endpoints (/image, /html, /markdown) correctly extract content from these URLs.

Closes #13

🤖 Generated with Claude Code

[konard]

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