Added thumbnailing functions to api, fixes #17

k4ever/api2/handlers.py

@@ -1,3 +1,4 @@
+from easy_thumbnails.files import get_thumbnailer
 from piston.handler import BaseHandler
 from piston.utils import rc
 from k4ever.buyable.models import *
@@ -13,6 +14,9 @@ from helper import *
 from django.db.models import Q
 import datetime
 
+# Available image sizes for thumbnails
+THUMB_SIZES = [(48,48), (64,64), (100,100), (150,150), (220, 220), (330, 330), (470, 470), (680, 680)]
+
 class BuyableItemHandler(BaseHandler):
 	"""Handler responsible for getting and buying items."""
 	
@@ -172,6 +176,7 @@ class BuyableItemHandler(BaseHandler):
 		
 		return rc.CREATED
 
+
 class BuyableTypeHandler(BaseHandler):
 	"""Handler for listing all :class:`BuyableType <buyable.models.BuyableType>`.
 
@@ -198,7 +203,44 @@ class HistoryHandler(BaseHandler):
 		if num > 0:
 			return qset[:num]
 		return qset
-			
+
+class ImgSizesHandler(BaseHandler):
+	""" Handler for listing all available tumbnailsizes """
+	allowed_methods = ('GET',)
+	
+	def read(self, request):
+		return THUMB_SIZES
+
+class ImgThumbHandler(BaseHandler):
+	""" Handler providing access to thumbnails for images of buyables """
+	allowed_methods = ('GET',)
+	
+	def read(self, request, itemId, xSize, ySize):
+		thumbSize = None
+		try:
+			thumbSize = (int(xSize), int(ySize))
+		except ValueError:
+			ret = rc.BAD_REQUEST
+			ret.write("\nSomething is seriously broken, django urls SHOULD have parsed out the non-number thingies\n")
+			return ret
+
+		if thumbSize not in THUMB_SIZES:
+			ret = rc.BAD_REQUEST
+			ret.write("\nThe requested thumbnailsize is not available\n")
+			return ret
+
+		item = None
+		try:
+			item = Buyable.objects.get(id=itemId)
+		except Buyable.DoesNotExist:
+			ret = rc.NOT_FOUND
+			ret.write("The item with the id '%s' could not be found\n" % (itemId,))
+			return ret
+		
+		thumbnail_options = dict(size=thumbSize)
+		thumb = get_thumbnailer(item.image).get_thumbnail(thumbnail_options)
+		return thumb._get_url()
+
 
 class TransactionTransactHandler(BaseHandler):
 	"""Handler for transaction.

k4ever/api2/urls.py

@@ -29,13 +29,14 @@ ad = {'authentication': multiAuth}
 buyableItemRes    = CsrfExemptResource(handler=BuyableItemHandler,     **ad)
 buyableTypeRes    = CsrfExemptResource(handler=BuyableTypeHandler,     **ad)
 historyRes = CsrfExemptResource(handler=HistoryHandler,         **ad)
+imgSizesRes  = CsrfExemptResource(handler=ImgSizesHandler, **ad)
+imgThumbRes = CsrfExemptResource(handler=ImgThumbHandler, **ad)
 
 transactionTransactRes = CsrfExemptResource(handler=TransactionTransactHandler, **ad)
 transactionTypeRes     = CsrfExemptResource(handler=TransactionTypeHandler, **ad)
 transactionVirtualRes  = CsrfExemptResource(handler=TransactionVirtualHandler, **ad)
 accountBalanceRes      = CsrfExemptResource(handler=AccountBalanceHandler, **ad)
 
-
 authBlobRes = CsrfExemptResource(handler=AuthBlobHandler, **ad)
 authUserRes = CsrfExemptResource(handler=AuthUserHandler, **ad)
 configRes   = CsrfExemptResource(handler=ConfigHandler, **ad)
@@ -47,6 +48,8 @@ urlpatterns = patterns('',
 	url(r'buyable/item/bulkbuy/?$', buyableItemRes, {'bulkBuy': True}),
 	url(r'buyable/types/?$', buyableTypeRes),
 	url(r'buyable/history/?$', historyRes),
+	url(r'buyable/img/sizes/?$', imgSizesRes),
+	url(r'buyable/img/thumb/(?P<itemId>\d+)/(?P<xSize>\d+)x(?P<ySize>\d+)/?$', imgThumbRes),
 	
 	url(r'account/transactions/transact/?$', transactionTransactRes),
 	url(r'account/transactions/types/?$', transactionTypeRes),

k4ever/docs/django/api.rst

@@ -98,6 +98,18 @@ to the handler or the responsible method for more documentation or code.
    		num			Number of entries
 		=========	=================
 
+  **img/**
+	:class:`sizes/ <api2.handlers.ImgSizesHandler>`
+   		:func:`GET <api2.handlers.ImgSizeHandler.read>`
+			List all available sizes for thumbnails
+
+	:class:`thumb/[itemId]/[xSize]x[ySize]/ <api2.handlers.ImgThumbHandler>`
+   		:func:`GET <api2.handlers.ImgThumbHandler.read>`
+			Returns the url to a thumbnail for [itemId] of size[xSize]x[ySize].
+			E.g. thumb/1/64x64/ returns the path to an image for the first item
+			and a dimension of 64x64. If the size is not available an error
+			is raised.
+
 **account/**
   **transactions/**
 	:class:`transact/ <api2.handlers.TransactionTransactHandler>`