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These are not operations on EncryptedFileMetadata but rather on
a combination of EncryptedFileMetadata and ciphertext. If C++ had
multimethods these could be bound to such a combination.
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Besides having a misleading name (and it goes back to the spec),
EncryptedFile under `file` key preempts the `url` (or `thumbnail_url`)
string value so only one of the two should exist. This is a case for
using std::variant<> - despite its clumsy syntax, it can actually
simplify and streamline code when all the necessary bits are in place
(such as conversion to JSON and getting the common piece - the URL -
out of it). This commit replaces `FileInfo::url` and `FileInfo::file`
with a common field `source` of type `FileSourceInfo` that is an alias
for a variant type covering both underlying types; and `url()` is
reintroduced as a function instead, to allow simplified access
to whichever URL is available inside the variant.
Oh, and EncryptedFile is EncryptedFileMetadata now, to clarify that it
does not represent the file payload itself but rather the data necessary
to obtain that payload.
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Co-authored-by: Alexey Rusakov <Kitsune-Ral@users.sf.net>
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The ciphertext for AES CTR is exactly as large as the plaintext (not
necessarily a multiple of the blocksize!). By truncating the ciphertext,
we do not send bytes that will be decrypted to gibberish.
As a side node, we probably do not need to initialize the ciphertext
buffer larger than the plaintext size at all, but the OpenSSL docs are a
bit vague about that.
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