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bpo-35805: Add parser for Message-ID email header. (GH-13397)

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* bpo-35805: Add parser for Message-ID header.

This parser is based on the definition of Identification Fields from RFC 5322
Sec 3.6.4.

This should also prevent folding of Message-ID header using RFC 2047 encoded
words and hence fix bpo-35805.

* Prevent folding of non-ascii message-id headers.
* Add fold method to MsgID token to prevent folding.
This commit is contained in:
Abhilash Raj 2019-06-04 13:41:34 -04:00 • committed by Barry Warsaw
parent bc6469f79c
commit 46d88a1131
6 changed files with 257 additions and 28 deletions
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33
Doc/library/email.headerregistry.rst
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@ -321,19 +321,26 @@ variant, :attr:`~.BaseHeader.max_count` is set to 1.
The default mappings are:
:subject: UniqueUnstructuredHeader
:date: UniqueDateHeader
:resent-date: DateHeader
:orig-date: UniqueDateHeader
:sender: UniqueSingleAddressHeader
:resent-sender: SingleAddressHeader
:to: UniqueAddressHeader
:resent-to: AddressHeader
:cc: UniqueAddressHeader
:resent-cc: AddressHeader
:from: UniqueAddressHeader
:resent-from: AddressHeader
:reply-to: UniqueAddressHeader
:subject: UniqueUnstructuredHeader
:date: UniqueDateHeader
:resent-date: DateHeader
:orig-date: UniqueDateHeader
:sender: UniqueSingleAddressHeader
:resent-sender: SingleAddressHeader
:to: UniqueAddressHeader
:resent-to: AddressHeader
:cc: UniqueAddressHeader
:resent-cc: AddressHeader
:bcc: UniqueAddressHeader
:resent-bcc: AddressHeader
:from: UniqueAddressHeader
:resent-from: AddressHeader
:reply-to: UniqueAddressHeader
:mime-version: MIMEVersionHeader
:content-type: ContentTypeHeader
:content-disposition: ContentDispositionHeader
:content-transfer-encoding: ContentTransferEncodingHeader
:message-id: MessageIDHeader
``HeaderRegistry`` has the following methods: