Add padding to base64 before decoding

[NolanTrem]

Fixes issue where strings with multiples of four characters caused "invalid start byte" errors during document ingestion.

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🚀	This description was created by Ellipsis for commit 89b0afb

Summary:

Added base64 padding and normalization in Document class to prevent decoding errors.

Key points:

• Added Document.decode_base64 method to handle base64 padding and normalization in r2r/base/abstractions/document.py.
• Updated Document.__init__ to use decode_base64 for decoding base64 strings.
• Ensures proper handling of base64 strings with multiples of four characters, preventing "invalid start byte" errors.

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[ellipsis-dev]

👍 Looks good to me! Reviewed everything up to 89b0afb in 32 seconds

More details

• Looked at 72 lines of code in 1 files
• Skipped 0 files when reviewing.
• Skipped posting 1 drafted comments based on config settings.

1. r2r/base/abstractions/document.py:46

• Draft comment:
  The implementation of decode_base64 method correctly handles the addition of necessary padding to base64 strings before decoding, which should resolve the issue with strings having lengths not multiple of four. Good use of regex for cleaning the input and exception handling for robust error feedback.
• Reason this comment was not posted:
  Confidence changes required: 0%
  The PR introduces a method to add padding to base64 strings before decoding. This is generally a good practice as base64 encoding requires the string length to be a multiple of 4. The method first checks if the data is a string and encodes it to ASCII, then removes any non-base64 characters, and finally adds the necessary padding before attempting to decode it. The exception handling is appropriate, raising a ValueError if the decoding fails. Overall, the implementation seems correct and should resolve the issue described in the PR.

Workflow ID: wflow_vxBupECWIxy4sCpb

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