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Simplify S3 object name generation 

The previous design used an extremely long prefix including a forward
slash that could have made managing uploaded objects extremely
difficult for operators.
This commit is contained in:
Roman Hargrave 2022-12-23 20:06:18 -08:00
parent 7c58c7aa0a
commit 5c7ec06224
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1 changed files with 4 additions and 12 deletions
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16
mod_s3_upload/src/mod_s3_upload.erl
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@ -447,16 +447,8 @@ object_url(BucketURL, FileName) ->
FileName :: binary()
) ->
ObjectName :: binary().
% generate a unique-in-time object name. the name consists of a hash
% derived from the file, node, time, and a random number, a
% forward-slash, and the original filename. this ensures that it does
% not collide with other objects, while the forward slash ensures that
% the client displays only the original file name.
% generate reasonably unique sortable (by time first) object name.
object_name(FileName) ->
MD = crypto:hash_init(sha256),
MDFilename = crypto:hash_update(MD, FileName),
MDNodeName = crypto:hash_update(MDFilename, atom_to_list(node())),
MDTime = crypto:hash_update(MDNodeName, <<(os:system_time())>>),
MDRand = crypto:hash_update(MDTime, crypto:strong_rand_bytes(256)),
Hash = crypto:hash_final(MDRand),
<<(str:to_hexlist(Hash))/binary, "/", FileName/binary>>.
str:format("~.36B~.36B-~s", [os:system_time(microsecond),
erlang:phash2(node()),
FileName]).