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Support underscores (in addition to hyphens) for charset detection. #10410

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Jul 27, 2021
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Support underscores (in addition to hyphens) for charset detection. #10410

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20030bc
issue:#10307, #prev-pull-request:#10306
srividyut Jul 16, 2021
a2a8c9e
Rename 10306.bugfix to 10410.bugfix
srividyut Jul 16, 2021
d3f581e
Update changelog.d/10410.bugfix
srividyut Jul 16, 2021
973e782
Added source code to "tests.test_preview.MediaEncodingTestCase(test_p…
srividyut Jul 16, 2021
27f6b04
Merge branch 'preview_url' of https://github.com/srividyut/synapse in…
srividyut Jul 16, 2021
b9bbe4b
Added source code to test_preview
srividyut Jul 16, 2021
53f9789
Separate tests.
clokep Jul 27, 2021
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1 change: 1 addition & 0 deletions changelog.d/10410.bugfix
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Slight improvements in character set detection for the "URL_Preview" feature.
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6 changes: 4 additions & 2 deletions synapse/rest/media/v1/preview_url_resource.py
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Expand Up @@ -58,9 +58,11 @@

logger = logging.getLogger(__name__)

_charset_match = re.compile(br'<\s*meta[^>]*charset\s*=\s*"?([a-z0-9-]+)"?', flags=re.I)
_charset_match = re.compile(
br'<\s*meta[^>]*charset\s*=\s*"?([a-z0-9_-]+)"?', flags=re.I
)
_xml_encoding_match = re.compile(
br'\s*<\s*\?\s*xml[^>]*encoding="([a-z0-9-]+)"', flags=re.I
br'\s*<\s*\?\s*xml[^>]*encoding="([a-z0-9_-]+)"', flags=re.I
)
_content_type_match = re.compile(r'.*; *charset="?(.*?)"?(;|$)', flags=re.I)

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