[Seaside] Serving files with WAComancheAdapter

[Tony Fleig]

I want to serve CSS and Javascript files from an on-disk directory (i.e. not
using WAFileLibrary) and also not using Apache.

I have JQuery CSS files that reference a large number of image files from an
images subdirectory. When these files are imported into a WAFileLibrary, the
image filenames are changed and of course there are no subdirectories.
Changing the original css file to accommodate this is not practical as I
expect to receive new ones periodically and then would have to do it all
over again.

I am attracted by the easy deployment of Seaside apps when Apache is not
involved and for the few files involved it doesn't seem to me that Apache is
warranted, especially during development of the site.

I could find no information on the right way to do this, so I subclassed
WAServerAdaptor as shown below.

With these modifications, If the URL received from the browser's path begins
with /static, then files are served from a specified directory. Otherwise,
the request is passed on (eventually) to WADispatcher as normal.

This works for me, but I have no idea as to whether there is an easier or
better way or if there is a feature to allow this that I just did not find.

I am coming back to Smalltalk after many years and I am definitely a bit
rusty, so any criticism of the code will also be greatly appreciated.

Regards,
TF


'From Pharo1.1 of 17 July 2010 [Latest update: #11411] on 26 October 2010 at
10:08:40 am'!
WAComancheAdaptor subclass: #TFComancheAdaptor
instanceVariableNames: 'staticDirectory staticPathPart'
classVariableNames: ''
poolDictionaries: ''
category: 'TFStuff'!

!TFComancheAdaptor methodsFor: 'as yet unclassified' stamp: 'TF 10/26/2010
08:58'!
defaultStaticDirectory
^ FileDirectory default pathName! !

!TFComancheAdaptor methodsFor: 'as yet unclassified' stamp: 'TF 10/26/2010
08:59'!
defaultStaticPathPart

^ 'static'! !

!TFComancheAdaptor methodsFor: 'as yet unclassified' stamp: 'TF 10/26/2010
09:55'!
process: aNativeRequest
"Serve static files from a specified directory if the URL path begins with a
specified name.
 The default staticDirectory is the current directory (nominally the Seaside
resources directory)
and the default static path part is 'static'. Thus, if the client requests
'http://localhost:8080/static/css/xyz.css' and the Seaside resources
directory is
'/home/user1/Seaside.app/Contents/Resources', the file returned will be
'/home/user1/Seaside.app/Contents/Resources/static/css/xyz.css'.
 Requests whose path does not begin with the static path part are
unaffected, i.e. they are
processed by the WAComancheAdapter as normal."

| context pathParts fullFilePath method response |
pathParts := aNativeRequest pathParts.
pathParts size > 1 ifTrue: [
(pathParts at: 1) = self staticPathPart ifTrue: [
method := aNativeRequest method.
(#(#GET #POST) includes: method) ifFalse: [^nil].
fullFilePath := self staticDirectory,aNativeRequest url.
(FileStream isAFileNamed: fullFilePath) ifFalse: [^nil].
^HttpResponse
fromStream: (StandardFileStream readOnlyFileNamed: fullFilePath).
]
] .

^ self processResponse: (super process: aNativeRequest)
! !

!TFComancheAdaptor methodsFor: 'as yet unclassified' stamp: 'TF 10/26/2010
09:54'!
processResponse: aResponse

"Ensures that we get the HttpAdaptor's standard notFound error
return, rather than the one line of text/plain that is returned by
WADispatcher."
 aResponse status = #notFound
ifTrue: [ ^nil ]
ifFalse: [^aResponse]
! !

!TFComancheAdaptor methodsFor: 'as yet unclassified' stamp: 'TF 10/26/2010
08:52'!
staticDirectory

staticDirectory isNil ifTrue: [ staticDirectory := self
defaultStaticDirectory ].
^ staticDirectory! !

!TFComancheAdaptor methodsFor: 'as yet unclassified' stamp: 'TF 10/26/2010
08:57'!
staticPathPart
 staticPathPart isNil ifTrue: [ staticPathPart := self defaultStaticPathPart
].
^ staticPathPart! !
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