[Seaside] File downloads etc

[Janko Mivšek]

Hi Göran,

Just for information, Swazoo can serve static pages too and in parallel 
with dynamic ones. Its Url resolution framework is designed to mix and 
match many types of resources, from existing FileMappingResource for 
serving static files to your own resource for dynamic content.

Best regards
Janko


goran at krampe.se wrote:
> Hi guys!
> 
> Ok, this has surely been discussed a *hundred* times - but I just
> started digging into Seaside for real so forgive me. And yes, I did
> search a bit with Google first. :)
> 
> The question is: How do people serve files with Seaside? Especially
> static files like images? And no, you don't need to reply if you use
> Apache or HV2 on the side :) - I am interested in the "Seaside way"
> here. And in my current project an external web server is a no-no. Using
> HV2 would be an option but I am learning Seaside now.
> 
> I started digging of course and found WADocumentHandler - but
> uncommented, as well as all the handler classes in fact, ehrm, <insert
> coughs here>. IMHO this is a lacking in Seaside - just a *teeeeny* bit
> too few class comments. :)  ...and why does WADocumentHandler>>response
> send #text to the content stream btw?
> 
> Anyway, suppose we add these two methods to WAImageTag:
> 
> WAImageTag>>fileName: aFileName mimeType: mimeString
> 	"Create a document handler for the file contents and insert
> 	a URL for it. The document will be served binary and with
> 	a non expiring cache."
> 
> 	^self url: (canvas context
> 				urlForDocument: ((StandardFileStream readOnlyFileNamed: aFileName)
> binary; contentsOfEntireFile)
> 				mimeType: mimeString
> 				fileName: aFileName).
> 
> WAImageTag>>fileName: aFileName
> 	"Create a document handler for the file contents and insert
> 	a URL for it. The document will be served binary and with
> 	a non expiring cache."
> 
> 	^self fileName: aFileName mimeType: (MIMEDocument
> guessTypeFromExtension: (FileDirectory extensionFor: aFileName))
> 
> Note how we don't send the filestream itself but fetch all its contents
> first - this is because otherwise the filestream gets put into the
> WAResponse which never closes it. Darn. So perhaps it was never meant to
> send a FileStream into #urlForDocument:.
> 
> Now, given how it works today (the WAResponse>>writeOn: will eventually
> send #contents to the stream and write that) there is no real point in
> sending the stream, so I read it all into memory myself, close the
> filestream and send the ByteArray or String. The downside is of course
> that we end up with all these loaded into the image, but for small
> images etc it is not a big deal.
> 
> I assume these handlers stick around for the session lifetime? Hmmm, ok
> even longer
> (http://lists.squeakfoundation.org/pipermail/seaside/2005-February/00441
> 1.html). And yes, above we could be smarter regarding where to look for
> files etc.
> 
> End usage with WACanvas:
> 
> MyComponent>>renderContentOn: html
> 	html image fileName: 'myimage.gif'
> 
> regards, Göran
> 
> PS. I assume WAImageTag>>resourceUrl: is for referring to stuff served
> by some other server? Or have I missed something?
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> 

-- 
Janko Mivšek
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