Hi Pablo,
> I mean, to get hash of the file attached to the document, I need to save
> the buffer for "context(utilities.sha2.hash256(io.loaddata(buffer)))".
>
> But I don’t need to save the buffer to attach it to the PDF document.
>
> My question is how to define \shabufferfile to avoid \savebuffer (only
> required to get the hash).
The SHA calculation isn't working properly because of a weird newline
issue. Try this:
\setupinteraction[state=start]
\setupinteractionscreen[option={attachment}]
\startbuffer[test]
just a test
and another one
\stopbuffer
\starttext
\startluacode
require("util-sha")
function sha256(str)
return utilities.sha2.hash256(
str:gsub(string.char(0x0D), string.char(0x0A))
)
end
\stopluacode
\def\shabuffer#1%
{\cldcontext{sha256(buffers.raw("#1"))}}
\def\shafile#1%
{\cldcontext{sha256(io.loaddata("#1"))}}
\shabuffer{test}
\savebuffer[test][temporary-αβγ, prefix=no]
\shafile{temporary-αβγ}
\attachment[buffer=test, name=\shabuffer{test}, method=hidden]
\stoptext
You can remove the "\savebuffer" and the "\shafile"; I just kept that in to
show that the two hashes are now the same.
-- Max
>
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