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Do not raise a 500 exception when previewing empty media. (#8883)

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Patrick Cloke 2020-12-07 10:00:08 -05:00 committed by GitHub
parent 92d87c6882
commit 1f3748f033
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3 changed files with 22 additions and 12 deletions
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1
changelog.d/8883.bugfix Normal file
View File

@ -0,0 +1 @@
Fix a 500 error when attempting to preview an empty HTML file.

6
synapse/rest/media/v1/preview_url_resource.py
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@ -676,7 +676,11 @@ class PreviewUrlResource(DirectServeJsonResource):
logger.debug("No media removed from url cache")
def decode_and_calc_og(body, media_uri, request_encoding=None):
def decode_and_calc_og(body, media_uri, request_encoding=None) -> Dict[str, str]:
# If there's no body, nothing useful is going to be found.
if not body:
return {}
from lxml import etree
try:

27
tests/test_preview.py
View File

@ -56,7 +56,7 @@ class PreviewTestCase(unittest.TestCase):
desc = summarize_paragraphs(example_paras, min_size=200, max_size=500)
self.assertEquals(
self.assertEqual(
desc,
"Tromsø (Norwegian pronunciation: [ˈtrʊmsœ] ( listen); Northern Sami:"
" Romsa; Finnish: Tromssa[2] Kven: Tromssa) is a city and municipality in"
@ -69,7 +69,7 @@ class PreviewTestCase(unittest.TestCase):
desc = summarize_paragraphs(example_paras[1:], min_size=200, max_size=500)
self.assertEquals(
self.assertEqual(
desc,
"Tromsø lies in Northern Norway. The municipality has a population of"
" (2015) 72,066, but with an annual influx of students it has over 75,000"
@ -96,7 +96,7 @@ class PreviewTestCase(unittest.TestCase):
desc = summarize_paragraphs(example_paras, min_size=200, max_size=500)
self.assertEquals(
self.assertEqual(
desc,
"Tromsø (Norwegian pronunciation: [ˈtrʊmsœ] ( listen); Northern Sami:"
" Romsa; Finnish: Tromssa[2] Kven: Tromssa) is a city and municipality in"
@ -122,7 +122,7 @@ class PreviewTestCase(unittest.TestCase):
]
desc = summarize_paragraphs(example_paras, min_size=200, max_size=500)
self.assertEquals(
self.assertEqual(
desc,
"Tromsø (Norwegian pronunciation: [ˈtrʊmsœ] ( listen); Northern Sami:"
" Romsa; Finnish: Tromssa[2] Kven: Tromssa) is a city and municipality in"
@ -149,7 +149,7 @@ class PreviewUrlTestCase(unittest.TestCase):
og = decode_and_calc_og(html, "http://example.com/test.html")
self.assertEquals(og, {"og:title": "Foo", "og:description": "Some text."})
self.assertEqual(og, {"og:title": "Foo", "og:description": "Some text."})
def test_comment(self):
html = """
@ -164,7 +164,7 @@ class PreviewUrlTestCase(unittest.TestCase):
og = decode_and_calc_og(html, "http://example.com/test.html")
self.assertEquals(og, {"og:title": "Foo", "og:description": "Some text."})
self.assertEqual(og, {"og:title": "Foo", "og:description": "Some text."})
def test_comment2(self):
html = """
@ -182,7 +182,7 @@ class PreviewUrlTestCase(unittest.TestCase):
og = decode_and_calc_og(html, "http://example.com/test.html")
self.assertEquals(
self.assertEqual(
og,
{
"og:title": "Foo",
@ -203,7 +203,7 @@ class PreviewUrlTestCase(unittest.TestCase):
og = decode_and_calc_og(html, "http://example.com/test.html")
self.assertEquals(og, {"og:title": "Foo", "og:description": "Some text."})
self.assertEqual(og, {"og:title": "Foo", "og:description": "Some text."})
def test_missing_title(self):
html = """
@ -216,7 +216,7 @@ class PreviewUrlTestCase(unittest.TestCase):
og = decode_and_calc_og(html, "http://example.com/test.html")
self.assertEquals(og, {"og:title": None, "og:description": "Some text."})
self.assertEqual(og, {"og:title": None, "og:description": "Some text."})
def test_h1_as_title(self):
html = """
@ -230,7 +230,7 @@ class PreviewUrlTestCase(unittest.TestCase):
og = decode_and_calc_og(html, "http://example.com/test.html")
self.assertEquals(og, {"og:title": "Title", "og:description": "Some text."})
self.assertEqual(og, {"og:title": "Title", "og:description": "Some text."})
def test_missing_title_and_broken_h1(self):
html = """
@ -244,4 +244,9 @@ class PreviewUrlTestCase(unittest.TestCase):
og = decode_and_calc_og(html, "http://example.com/test.html")
self.assertEquals(og, {"og:title": None, "og:description": "Some text."})
self.assertEqual(og, {"og:title": None, "og:description": "Some text."})
def test_empty(self):
html = ""
og = decode_and_calc_og(html, "http://example.com/test.html")
self.assertEqual(og, {})