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views.py
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views.py
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# __BEGIN_LICENSE__
# Copyright (C) 2008-2010 United States Government as represented by
# the Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
# __END_LICENSE__
import os
import json
import logging
import time
import rfc822
try:
from cStringIO import StringIO
except ImportError:
from StringIO import StringIO
import PIL.Image
from django.shortcuts import render_to_response
from django.http import HttpResponse, HttpResponseRedirect, HttpResponseNotFound
from django.http import HttpResponseNotAllowed, Http404
from django.template import RequestContext
from django.shortcuts import get_object_or_404
from django.views.decorators.csrf import csrf_exempt
from django.core.urlresolvers import reverse
from django.core.files.base import ContentFile
from django.db import transaction
from django.core.cache import cache
from django.core.exceptions import ObjectDoesNotExist
from geocamTiePoint import models, forms, settings
from geocamTiePoint.models import Overlay, QuadTree
from geocamTiePoint import quadTree, transform, garbage
from geocamTiePoint import anypdf as pdf
if settings.USING_APP_ENGINE:
from google.appengine.api import backends
from google.appengine.api import taskqueue
TRANSPARENT_PNG_BINARY = '\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\x00\x00\x00\x01\x00\x00\x00\x01\x08\x06\x00\x00\x00\x1f\x15\xc4\x89\x00\x00\x00\x01sRGB\x00\xae\xce\x1c\xe9\x00\x00\x00\rIDAT\x08\xd7c````\x00\x00\x00\x05\x00\x01^\xf3*:\x00\x00\x00\x00IEND\xaeB`\x82'
PDF_MIME_TYPES = ('application/pdf',
'application/acrobat',
'application/nappdf',
'application/x-pdf',
'application/vnd.pdf',
'text/pdf',
'text/x-pdf',
)
def transparentPngData():
return (TRANSPARENT_PNG_BINARY, 'image/png')
def dumps(obj):
return json.dumps(obj, sort_keys=True, indent=4)
def export_settings(export_vars=None):
if export_vars == None:
export_vars = ('GEOCAM_TIE_POINT_DEFAULT_MAP_VIEWPORT',
'GEOCAM_TIE_POINT_ZOOM_LEVELS_PAST_OVERLAY_RESOLUTION',
)
return dumps(dict([(k, getattr(settings, k)) for k in export_vars]))
def ember(request):
if request.method == 'GET':
return render_to_response('geocamTiePoint/ember.html', {},
context_instance=RequestContext(request))
else:
return HttpResponseNotAllowed(['GET'])
def backbone(request):
initial_overlays = Overlay.objects.order_by('pk')
if request.method == 'GET':
return render_to_response('geocamTiePoint/backbone.html',
{
'initial_overlays_json': dumps(list(o.jsonDict for o in initial_overlays)) if initial_overlays else [],
'settings': export_settings(),
},
context_instance=RequestContext(request))
else:
return HttpResponseNotAllowed(['GET'])
def overlayIndex(request):
if request.method == 'GET':
overlays = models.Overlay.objects.all()
return render_to_response('geocamTiePoint/overlay-index.html',
{'overlays': overlays},
context_instance=RequestContext(request))
else:
return HttpResponseNotAllowed(['GET'])
def overlayDelete(request, key):
if request.method == 'GET':
overlay = get_object_or_404(Overlay, key=key)
return render_to_response('geocamTiePoint/overlay-delete.html',
{'overlay': overlay,
'overlayJson': dumps(overlay.jsonDict)},
context_instance=RequestContext(request))
elif request.method == 'POST':
overlay = get_object_or_404(Overlay, key=key)
overlay.delete()
return HttpResponseRedirect(reverse('geocamTiePoint_overlayIndex'))
@transaction.commit_on_success
def overlayNew(request):
if request.method == 'POST':
form = forms.NewImageDataForm(request.POST, request.FILES)
if form.is_valid():
# create and save new empty overlay so we can refer to it
# this causes a ValueError if the user isn't logged in
overlay = models.Overlay(author=request.user)
overlay.save()
# save imageData
image = None
imageRef = form.cleaned_data['image']
imageData = models.ImageData(contentType=imageRef.content_type,
overlay=overlay)
if imageRef.content_type in PDF_MIME_TYPES:
# convert PDF to raster image
pngData = pdf.convertPdf(imageRef.file.read())
imageData.image.save('dummy.png', ContentFile(pngData), save=False)
imageData.contentType = 'image/png'
else:
bits = imageRef.file.read()
image = PIL.Image.open(StringIO(bits))
if image.mode != 'RGBA':
# add alpha channel to image for better
# transparency handling later
image = image.convert('RGBA')
out = StringIO()
image.save(out, format='png')
convertedBits = out.getvalue()
logging.info('converted image to RGBA, output length %s bytes',
len(bits))
imageData.image.save('dummy.png', ContentFile(convertedBits),
save=False)
imageData.contentType = 'image/png'
else:
imageData.image.save('dummy.png', ContentFile(bits), save=False)
imageData.contentType = imageRef.content_type
imageData.save()
if image is None:
image = PIL.Image.open(imageData.image.file)
# fill in overlay info
overlay.name = imageRef.name
overlay.imageData = imageData
overlay.extras.points = []
overlay.extras.imageSize = image.size
overlay.save()
# generate initial quad tree
overlay.generateUnalignedQuadTree()
overlay.save()
# check to see if the client was ajax, in which case
# we respond with json
if request.is_ajax():
data = {'status': 'success', 'id': overlay.key}
return HttpResponse(json.dumps(data))
# otherwise respond with a normal page.
return render_to_response('geocamTiePoint/new-overlay-result.html',
{'status': 'success',
'id': overlay.key},
context_instance=RequestContext(request))
else:
return render_to_response('geocamTiePoint/new-overlay.html',
{'form': form},
context_instance=RequestContext(request))
elif request.method == 'GET':
form = forms.NewImageDataForm()
return render_to_response('geocamTiePoint/new-overlay.html',
{'form': form},
context_instance=RequestContext(request))
else:
return HttpResponseNotAllowed(('POST', 'GET'))
def overlayId(request, key):
if request.method == 'GET':
overlay = get_object_or_404(Overlay, key=key)
settingsExportVars = ('GEOCAM_TIE_POINT_DEFAULT_MAP_VIEWPORT',
'GEOCAM_TIE_POINT_ZOOM_LEVELS_PAST_OVERLAY_RESOLUTION',)
settingsExportDict = dict([(k, getattr(settings, k)) for k in settingsExportVars])
return render_to_response('geocamTiePoint/overlay-view.html',
{'overlay': overlay,
'overlayJson': dumps(overlay.jsonDict),
'settings': dumps(settingsExportDict)},
context_instance=RequestContext(request))
else:
return HttpResponseNotAllowed(['GET'])
def overlayIdPreview(request, key):
if request.method == 'GET':
overlay = get_object_or_404(Overlay, key=key)
settingsExportVars = ('STATIC_URL',)
settingsExportDict = dict([(k, getattr(settings, k)) for k in settingsExportVars])
return render_to_response('geocamTiePoint/overlay-preview.html',
{'overlay': overlay,
'overlayJson': dumps(overlay.jsonDict),
'settings': dumps(settingsExportDict)},
context_instance=RequestContext(request))
else:
return HttpResponseNotAllowed(['GET'])
@csrf_exempt
def overlayIdJson(request, key):
if request.method == 'GET':
overlay = get_object_or_404(Overlay, key=key)
return HttpResponse(dumps(overlay.jsonDict), content_type='application/json')
elif request.method in ('POST', 'PUT'):
overlay = get_object_or_404(Overlay, key=key)
overlay.jsonDict = json.loads(request.raw_post_data)
transformDict = overlay.extras.get('transform')
if transformDict:
overlay.extras.bounds = (quadTree.imageMapBounds
(overlay.extras.imageSize,
transform.makeTransform(transformDict)))
overlay.generateAlignedQuadTree()
overlay.save()
return HttpResponse(dumps(overlay.jsonDict), content_type='application/json')
elif request.method == 'DELETE':
get_object_or_404(Overlay, pk=key).delete()
return HttpResponse("OK")
else:
return HttpResponseNotAllowed(['GET', 'POST', 'PUT', 'DELETE'])
@csrf_exempt
def overlayListJson(request):
overlays = Overlay.objects.all()
return HttpResponse(dumps(list(o.jsonDict for o in overlays)), content_type='application/json')
@csrf_exempt
def overlayIdWarp(request, key):
"""
Explicit warp call is deprecated. We now warp every time the client
posts an update to the overlay.
"""
if request.method == 'GET':
return render_to_response('geocamTiePoint/warp-form.html', {},
context_instance=RequestContext(request))
elif request.method == 'POST':
overlay = get_object_or_404(Overlay, key=key)
overlay.generateAlignedQuadTree()
overlay.save()
return HttpResponse("{}", content_type='application/json')
else:
return HttpResponseNotAllowed(['GET', 'POST'])
def overlayIdImageFileName(request, key, fileName):
if request.method == 'GET':
overlay = get_object_or_404(Overlay, key=key)
fobject = overlay.imageData.image.file
response = HttpResponse(fobject.read(), content_type=overlay.imageData.contentType)
return response
else:
return HttpResponseNotAllowed(['GET'])
def getTileData(quadTreeId, zoom, x, y):
gen = QuadTree.getGeneratorWithCache(quadTreeId)
try:
return gen.getTileData(zoom, x, y)
except quadTree.ZoomTooBig:
return transparentPngData()
except quadTree.OutOfBounds:
return transparentPngData()
def neverExpires(response):
"""
Manually sets the HTTP 'Expires' header one year in the
future. Normally the Django cache middleware handles this, but we
are directly using the low-level cache API.
Empirically, this *hugely* reduces the number of requests from the
Google Maps API. One example is that zooming out one level stupidly
loads all the tiles in the new zoom level twice if tiles immediately
expire.
"""
response['Expires'] = rfc822.formatdate(time.time() + 365 * 24 * 60 * 60)
return response
def getTile(request, quadTreeId, zoom, x, y):
quadTreeId = int(quadTreeId)
zoom = int(zoom)
x = int(x)
y = int(os.path.splitext(y)[0])
key = quadTree.getTileCacheKey(quadTreeId, zoom, x, y)
data = cache.get(key)
if data is None:
logging.info('\ngetTile MISS %s\n', key)
data = getTileData(quadTreeId, zoom, x, y)
cache.set(key, data)
else:
logging.info('getTile hit %s', key)
bits, contentType = data
response = HttpResponse(bits, content_type=contentType)
return neverExpires(response)
def getPublicTile(request, quadTreeId, zoom, x, y):
cacheKey = 'geocamTiePoint.QuadTree.isPublic.%s' % quadTreeId
quadTreeIsPublic = cache.get(cacheKey)
if quadTreeIsPublic is None:
logging.info('getPublicTile MISS %s', cacheKey)
try:
q = QuadTree.objects.get(id=quadTreeId)
overlay = q.alignedOverlays.get()
except ObjectDoesNotExist:
overlay = None
if overlay:
quadTreeIsPublic = overlay.isPublic
else:
quadTreeIsPublic = False
cache.set(cacheKey, quadTreeIsPublic, 60)
else:
logging.info('getPublicTile hit %s', cacheKey)
if quadTreeIsPublic:
return getTile(request, quadTreeId, zoom, x, y)
else:
return HttpResponseNotFound('QuadTree %s does not exist or is not public'
% quadTreeId)
def dummyView(*args, **kwargs):
return HttpResponseNotFound()
def uiDemo(request, key):
if request.method == 'GET':
overlay = get_object_or_404(Overlay, key=key)
settingsExportVars = ('GEOCAM_TIE_POINT_DEFAULT_MAP_VIEWPORT',
'GEOCAM_TIE_POINT_ZOOM_LEVELS_PAST_OVERLAY_RESOLUTION',)
settingsExportDict = dict([(k, getattr(settings, k)) for k in settingsExportVars])
return render_to_response('geocamTiePoint/uiDemo.html',
{'overlayJson': dumps(overlay.jsonDict),
'settings': dumps(settingsExportDict)},
context_instance=RequestContext(request))
else:
return HttpResponseNotAllowed(['GET'])
@csrf_exempt
def overlayGenerateExport(request, key):
if request.method == 'POST':
if settings.USING_APP_ENGINE:
onFrontEndInstance = (backends.get_backend() == None)
if onFrontEndInstance:
# on app engine, quadTree generation may take too long
# for a frontend instance, so we pass it to a backend
taskqueue.add(url='/backend' + request.path,
target='processing')
return HttpResponse('{"result": "ok"}',
content_type='application/json')
overlay = get_object_or_404(Overlay, key=key)
overlay.generateExport()
return HttpResponse('{"result": "ok"}',
content_type='application/json')
else:
return HttpResponseNotAllowed(['POST'])
def overlayExportInterface(request, key):
if request.method == 'GET':
overlay = get_object_or_404(Overlay, key=key)
return render_to_response('geocamTiePoint/export.html',
{'overlay': overlay,
'overlayJson': dumps(overlay.jsonDict)},
context_instance=RequestContext(request))
else:
return HttpResponseNotAllowed(['GET'])
def overlayExport(request, key, fname):
if request.method == 'GET':
overlay = get_object_or_404(Overlay, key=key)
if not (overlay.alignedQuadTree and overlay.alignedQuadTree.exportZip):
raise Http404('no export archive generated for requested overlay yet')
return HttpResponse(overlay.alignedQuadTree.exportZip.file.read(),
content_type='application/x-tgz')
else:
return HttpResponseNotAllowed(['GET'])
@csrf_exempt
def garbageCollect(request, dryRun='1'):
if request.method == 'GET':
return render_to_response('geocamTiePoint/gc.html',
{},
context_instance=RequestContext(request))
elif request.method == 'POST':
dryRun = int(dryRun)
garbage.garbageCollect(dryRun)
return HttpResponse('{"result": "ok"}', content_type='application/json')
else:
return HttpResponseNotAllowed(['GET', 'POST'])