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| Guest |
 Posted: Mon Aug 06, 2007 12:30 pm |
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Guest
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Wonder if anyone can help.
Part of my current erlyweb project needs to serve text and binary
files that have been uploaded. I have done the upload bit but am
having issues working out how to achieve the downloading/streaming. I
the usage scenario for my app, the user uploads a file to a space. the
file appears as a hyper link within that space. The user can click of
this link and the file will be delivered over http through the browser
(just like a file in apache/yaws etc..). The catch is I need to
authorise the user in the same way I do when they access the space in
the browser. At the moment I check if the user is logged in inside the
hook/1. I then check access privileges (using an internal scheme)
using the before_call/2. So the delivery of the uploaded files needs
to use the same or similar scheme. I have already seen the yaws doc
about streaming http://yaws.hyber.org/stream.yaws. This gives me some
clues although the example would be better if it actually used files
in my opinion. The difficult part is how I would use this facility in
combination with ErlyWeb and help or suggestions would be appreciated.
regards
Al
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| Guest |
| Posted: Mon Aug 06, 2007 3:47 pm |
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Guest
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Actually I have just discovered Yaws authmod directive. I am going to
try to use this in the meantime.
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| Posted: Sun Aug 12, 2007 3:47 am |
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Guest
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Hi Al,
The approach I like to take for authentication is this: in hook/1,
check if the user is logged in. If he is, put this information (and
possibly the user's session data) in the Arg's 'opaque' list. E.g.
hook(A) ->
A1 = case logged_in(A) of
true ->
yaws_arg:opaque(A, [get_session_data(A), yaws_arg:opaque(A)]);
false ->
A,
....
% rest of function
Then, in the ErlyWeb controllers, you can easily check if the user is
logged in (and get his session data) by examining the Arg's opaque
field.
I personally don't like to use before_call(). I like to have a function such as
if_logged_in(A, Fun) ->
case logged_in(A) of
true ->
Fun();
false ->
{ewr, login_page}
end.
and then use it in controller functions directly (this is a matter of
preference, of course).
To use the streaming directive, simply return the 'response' tuple
from your controller function (see 'returning arbitrary yaws tuples'
in the ErlyWeb docs), e.g.
{response, [{streamcontent, "application/octet-stream", <<>>}]}.
Everything else should work identically to the Yaws docs.
Yariv
On 8/6/07, Al <al@folknology.com> wrote:
>
> Wonder if anyone can help.
>
> Part of my current erlyweb project needs to serve text and binary
> files that have been uploaded. I have done the upload bit but am
> having issues working out how to achieve the downloading/streaming. I
> the usage scenario for my app, the user uploads a file to a space. the
> file appears as a hyper link within that space. The user can click of
> this link and the file will be delivered over http through the browser
> (just like a file in apache/yaws etc..). The catch is I need to
> authorise the user in the same way I do when they access the space in
> the browser. At the moment I check if the user is logged in inside the
> hook/1. I then check access privileges (using an internal scheme)
> using the before_call/2. So the delivery of the uploaded files needs
> to use the same or similar scheme. I have already seen the yaws doc
> about streaming http://yaws.hyber.org/stream.yaws. This gives me some
> clues although the example would be better if it actually used files
> in my opinion. The difficult part is how I would use this facility in
> combination with ErlyWeb and help or suggestions would be appreciated.
>
> regards
> Al
>
>
> >
>
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