MAINT: Simplify file identifiers generation #2003
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Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #2003 +/- ##
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- Coverage 95.14% 95.13% -0.02%
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Files 51 51
Lines 8551 8551
Branches 1706 1707 +1
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- Hits 8136 8135 -1
Misses 261 261
- Partials 154 155 +1 ☔ View full report in Codecov by Sentry. |
MartinThoma
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| return ByteStringObject(_rolling_checksum(stream).encode("utf8")) | ||
| def _compute_document_identifier(self) -> ByteStringObject: | ||
| md5 = hashlib.md5() | ||
| md5.update(str(time.time()).encode("utf-8")) |
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This makes document-generation non-deterministic, right?
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See #2003 Co-authored-by: exiledkingcc <exiledkingcc@gmail.com>
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See #2003 Co-authored-by: exiledkingcc <exiledkingcc@gmail.com>
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#2003 Co-authored-by: exiledkingcc <exiledkingcc@gmail.com>
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#2003 Co-authored-by: exiledkingcc <exiledkingcc@gmail.com>
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| @@ -1246,7 +1244,7 @@ def generate_file_identifiers(self) -> None: | |||
| id2 = self._compute_document_identifier() | |||
| else: | |||
| id1 = self._compute_document_identifier() | |||
| id2 = id1 | |||
| id2 = ByteStringObject(id1.original_bytes) | |||
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id1 is a ByteStringObject already. So .original_bytes just returns id1. Then wrapping it in ByteStringObject doesn't do anything, right?
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| return ByteStringObject(_rolling_checksum(stream).encode("utf8")) | ||
| md5 = hashlib.md5() | ||
| md5.update(str(time.time()).encode("utf-8")) | ||
| md5.update(str(self.fileobj).encode("utf-8")) |
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Is self.fileobj equivalent to self._write_pdf_structure(stream)?
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The PDF standard says:
the identifiers are also be used for encryption.
Why this PR improves pypdf:
PdfWriter.encryptis called, the identifiers are genearated by uncrypted pdf stream,then
PdfWriter.writecalled, the content of pdf file is encrypted, so the hash changed.for encrypted pdf, identifiers must be generated before write to stream, since the identifier will be used to calculate the key,
so the identifiers cannot be the hash of pdf stream content.