Fix base64 encode/decode bug due to Pydantic issue #48
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woodruffw
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Sep 19, 2024
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| class Base64EncoderSansNewline(Base64Encoder): | ||
| r"""A Base64Encoder that doesn't insert newlines when encoding. | ||
| Pydantic's Base64Bytes type inserts newlines b'\n' every 76 characters because they | ||
| use `base64.encodebytes()` instead of `base64.b64encode()`. Pydantic maintainers | ||
| have stated that they won't fix this, and that users should work around it by | ||
| defining their own Base64 type with a custom encoder. | ||
| See https://github.com/pydantic/pydantic/issues/9072 for more details. | ||
| """ | ||
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| @classmethod | ||
| def encode(cls, value: bytes) -> bytes: | ||
| """Encode bytes to base64.""" | ||
| return base64.b64encode(value) | ||
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| @classmethod | ||
| def decode(cls, value: bytes) -> bytes: | ||
| """Decode base64 bytes.""" | ||
| return base64.b64decode(value, validate=True) | ||
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| Base64Bytes = Annotated[bytes, EncodedBytes(encoder=Base64EncoderSansNewline)] |
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Let's add a backstop test for this type as well, to assert that it absolutely never contains newlines in its encodings and fails when newlines are present while decoding.
woodruffw
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Sep 19, 2024
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Thanks @facutuesca! One comment + let's add a bugfix changelog entry for this 🙂
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This was referenced Sep 19, 2024
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Pydantic's
Base64Bytesencodes bytes to base64 inserting newlines (b'\n') every 76 characters. This is not correct for our use case, so this PR switches to our ownBase64Byteswith a custom encoder.See pydantic/pydantic#9072 (comment) for more context.