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Add X-Robots-Tag header to stop crawlers from indexing media (#8887)

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Fixes / related to: https://github.com/matrix-org/synapse/issues/6533

This should do essentially the same thing as a robots.txt file telling robots to not index the media repo. https://developers.google.com/search/reference/robots_meta_tag

Signed-off-by: Aaron Raimist <aaron@raim.ist>
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Aaron Raimist 2020-12-08 16:51:03 -06:00 committed by GitHub
parent ab7a24cc6b
commit cd9e72b185
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3 changed files with 19 additions and 0 deletions
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1
changelog.d/8887.feature Normal file
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@ -0,0 +1 @@
Add `X-Robots-Tag` header to stop web crawlers from indexing media.

5
synapse/rest/media/v1/_base.py
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@ -155,6 +155,11 @@ def add_file_headers(request, media_type, file_size, upload_name):
request.setHeader(b"Cache-Control", b"public,max-age=86400,s-maxage=86400") request.setHeader(b"Cache-Control", b"public,max-age=86400,s-maxage=86400")
request.setHeader(b"Content-Length", b"%d" % (file_size,)) request.setHeader(b"Content-Length", b"%d" % (file_size,))
# Tell web crawlers to not index, archive, or follow links in media. This
# should help to prevent things in the media repo from showing up in web
# search results.
request.setHeader(b"X-Robots-Tag", "noindex, nofollow, noarchive, noimageindex")
# separators as defined in RFC2616. SP and HT are handled separately. # separators as defined in RFC2616. SP and HT are handled separately.
# see _can_encode_filename_as_token. # see _can_encode_filename_as_token.

13
tests/rest/media/v1/test_media_storage.py
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@ -362,3 +362,16 @@ class MediaRepoTests(unittest.HomeserverTestCase):
"error": "Not found [b'example.com', b'12345']", "error": "Not found [b'example.com', b'12345']",
}, },
) )
def test_x_robots_tag_header(self):
"""
Tests that the `X-Robots-Tag` header is present, which informs web crawlers
to not index, archive, or follow links in media.
"""
channel = self._req(b"inline; filename=out" + self.test_image.extension)
headers = channel.headers
self.assertEqual(
headers.getRawHeaders(b"X-Robots-Tag"),
[b"noindex, nofollow, noarchive, noimageindex"],
)