gh-92081: Fix for email.generator.Generator with whitespace between encoded words. #92281
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This is a work in progress because #92081 has one other issue that also needs to be fixed. Whitespace at the start of the Subject is being omitted as well. I'm leaning towards fixing that one in the decoder but I'm still reading through the rfcs to see if it has anything to say about that. Note: the other issue has been fixed here as well and this is ready for review. |
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Apr 26, 2023
| @@ -1628,7 +1629,7 @@ def test_address_display_names(self): | |||
| 'Lôrem ipsum dôlôr sit amet, cônsectetuer adipiscing. ' | |||
| 'Suspendisse pôtenti. Aliquam nibh. Suspendisse pôtenti.', | |||
| '=?utf-8?q?L=C3=B4rem_ipsum_d=C3=B4l=C3=B4r_sit_amet=2C_c' | |||
| '=C3=B4nsectetuer?=\n =?utf-8?q?adipiscing=2E_Suspendisse' | |||
| '=C3=B4nsectetuer?=\n =?utf-8?q?_adipiscing=2E_Suspendisse' | |||
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Note, the data in the unittest was buggy. If you run the original output through decode_header() you'll find that it is missing the space between cônsectetuer and adipiscing
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This fix is now ready to be reviewed. |
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Hey @warsaw , this fix is ready for review if you have some cycles to spare for thinking about email and the stdlib. |
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@abadger I tested this fix on my project and it worked like a charm. Inexpressible thanks! Will use your patch until this will not be merged into CPython :) |
email.generator.Generator currently does not handle whitespace between encoded words correctly when the encoded words span multiple lines. The current generator will create an encoded word for each line. If the end of the line happens to correspond with the end real word in the plaintext, the generator will place an unencoded space at the start of the subsequent lines to represent the whitespace between the plaintext words. A compliant decoder will strip all the whitespace from between two encoded words which leads to missing spaces in the round-tripped output. The fix for this is to make sure that whitespace between two encoded words ends up inside of one or the other of the encoded words. This fix places the space inside of the second encoded word. A second problem happens with continuation lines. A continuation line that starts with whitespace and is followed by a non-encoded word is fine because the newline between such continuation lines is defined as condensing to a single space character. When the continuation line starts with whitespace followed by an encoded word, however, the RFCs specify that the word is run together with the encoded word on the previous line. This is because normal words are filded on syntactic breaks by encoded words are not. The solution to this is to add the whitespace to the start of the encoded word on the continuation line. Test cases are from python#92081
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…ween encoded words. (pythonGH-92281) * Fix for email.generator.Generator with whitespace between encoded words. email.generator.Generator currently does not handle whitespace between encoded words correctly when the encoded words span multiple lines. The current generator will create an encoded word for each line. If the end of the line happens to correspond with the end real word in the plaintext, the generator will place an unencoded space at the start of the subsequent lines to represent the whitespace between the plaintext words. A compliant decoder will strip all the whitespace from between two encoded words which leads to missing spaces in the round-tripped output. The fix for this is to make sure that whitespace between two encoded words ends up inside of one or the other of the encoded words. This fix places the space inside of the second encoded word. A second problem happens with continuation lines. A continuation line that starts with whitespace and is followed by a non-encoded word is fine because the newline between such continuation lines is defined as condensing to a single space character. When the continuation line starts with whitespace followed by an encoded word, however, the RFCs specify that the word is run together with the encoded word on the previous line. This is because normal words are filded on syntactic breaks by encoded words are not. The solution to this is to add the whitespace to the start of the encoded word on the continuation line. Test cases are from pythonGH-92081 * Rename a variable so it's not confused with the final variable. (cherry picked from commit a6fdb31) Co-authored-by: Toshio Kuratomi <a.badger@gmail.com>
miss-islington
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May 20, 2024
…ween encoded words. (pythonGH-92281) * Fix for email.generator.Generator with whitespace between encoded words. email.generator.Generator currently does not handle whitespace between encoded words correctly when the encoded words span multiple lines. The current generator will create an encoded word for each line. If the end of the line happens to correspond with the end real word in the plaintext, the generator will place an unencoded space at the start of the subsequent lines to represent the whitespace between the plaintext words. A compliant decoder will strip all the whitespace from between two encoded words which leads to missing spaces in the round-tripped output. The fix for this is to make sure that whitespace between two encoded words ends up inside of one or the other of the encoded words. This fix places the space inside of the second encoded word. A second problem happens with continuation lines. A continuation line that starts with whitespace and is followed by a non-encoded word is fine because the newline between such continuation lines is defined as condensing to a single space character. When the continuation line starts with whitespace followed by an encoded word, however, the RFCs specify that the word is run together with the encoded word on the previous line. This is because normal words are filded on syntactic breaks by encoded words are not. The solution to this is to add the whitespace to the start of the encoded word on the continuation line. Test cases are from pythonGH-92081 * Rename a variable so it's not confused with the final variable. (cherry picked from commit a6fdb31) Co-authored-by: Toshio Kuratomi <a.badger@gmail.com>
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GH-119245 is a backport of this pull request to the 3.13 branch. |
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GH-119246 is a backport of this pull request to the 3.12 branch. |
warsaw
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May 20, 2024
…tween encoded words. (GH-92281) (#119245) * Fix for email.generator.Generator with whitespace between encoded words. email.generator.Generator currently does not handle whitespace between encoded words correctly when the encoded words span multiple lines. The current generator will create an encoded word for each line. If the end of the line happens to correspond with the end real word in the plaintext, the generator will place an unencoded space at the start of the subsequent lines to represent the whitespace between the plaintext words. A compliant decoder will strip all the whitespace from between two encoded words which leads to missing spaces in the round-tripped output. The fix for this is to make sure that whitespace between two encoded words ends up inside of one or the other of the encoded words. This fix places the space inside of the second encoded word. A second problem happens with continuation lines. A continuation line that starts with whitespace and is followed by a non-encoded word is fine because the newline between such continuation lines is defined as condensing to a single space character. When the continuation line starts with whitespace followed by an encoded word, however, the RFCs specify that the word is run together with the encoded word on the previous line. This is because normal words are filded on syntactic breaks by encoded words are not. The solution to this is to add the whitespace to the start of the encoded word on the continuation line. Test cases are from GH-92081 * Rename a variable so it's not confused with the final variable. (cherry picked from commit a6fdb31) Co-authored-by: Toshio Kuratomi <a.badger@gmail.com>
warsaw
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May 20, 2024
…tween encoded words. (GH-92281) (#119246) * Fix for email.generator.Generator with whitespace between encoded words. email.generator.Generator currently does not handle whitespace between encoded words correctly when the encoded words span multiple lines. The current generator will create an encoded word for each line. If the end of the line happens to correspond with the end real word in the plaintext, the generator will place an unencoded space at the start of the subsequent lines to represent the whitespace between the plaintext words. A compliant decoder will strip all the whitespace from between two encoded words which leads to missing spaces in the round-tripped output. The fix for this is to make sure that whitespace between two encoded words ends up inside of one or the other of the encoded words. This fix places the space inside of the second encoded word. A second problem happens with continuation lines. A continuation line that starts with whitespace and is followed by a non-encoded word is fine because the newline between such continuation lines is defined as condensing to a single space character. When the continuation line starts with whitespace followed by an encoded word, however, the RFCs specify that the word is run together with the encoded word on the previous line. This is because normal words are filded on syntactic breaks by encoded words are not. The solution to this is to add the whitespace to the start of the encoded word on the continuation line. Test cases are from GH-92081 * Rename a variable so it's not confused with the final variable. (cherry picked from commit a6fdb31) Co-authored-by: Toshio Kuratomi <a.badger@gmail.com>
estyxx
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Jul 17, 2024
…ween encoded words. (python#92281) * Fix for email.generator.Generator with whitespace between encoded words. email.generator.Generator currently does not handle whitespace between encoded words correctly when the encoded words span multiple lines. The current generator will create an encoded word for each line. If the end of the line happens to correspond with the end real word in the plaintext, the generator will place an unencoded space at the start of the subsequent lines to represent the whitespace between the plaintext words. A compliant decoder will strip all the whitespace from between two encoded words which leads to missing spaces in the round-tripped output. The fix for this is to make sure that whitespace between two encoded words ends up inside of one or the other of the encoded words. This fix places the space inside of the second encoded word. A second problem happens with continuation lines. A continuation line that starts with whitespace and is followed by a non-encoded word is fine because the newline between such continuation lines is defined as condensing to a single space character. When the continuation line starts with whitespace followed by an encoded word, however, the RFCs specify that the word is run together with the encoded word on the previous line. This is because normal words are filded on syntactic breaks by encoded words are not. The solution to this is to add the whitespace to the start of the encoded word on the continuation line. Test cases are from python#92081 * Rename a variable so it's not confused with the final variable.
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email.generator.Generator currently does not handle whitespace between
encoded words correctly when the encoded words span multiple lines. The
current generator will create an encoded word for each line. If the end
of the line happens to correspond with the end real word in the
plaintext, the generator will place an unencoded space at the start of
the subsequent lines to represent the whitespace between the plaintext
words.
A compliant decoder will strip all the whitespace from between two
encoded words which leads to missing spaces in the round-tripped
output.
The fix for this is to make sure that whitespace between two encoded
words ends up inside of one or the other of the encoded words. This
fix places the space inside of the second encoded word.
Test case from #92081