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photos.py
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photos.py
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import webapp2
from google.appengine.ext import blobstore
from google.appengine.ext.webapp import blobstore_handlers
import json
from google.appengine.ext import ndb
from google.appengine.api import images
import db_defs
import requests
#from models import UserPicfayAsset
#Source code for this file was inspired by Wolford CS 496 lectures
#code for uploading blobs sourced from:
#thedeveloperworldisyours.com/python/gae-reading-big-csv-blobstore-python
class uploadUrl(webapp2.RequestHandler):
#requests an upload url
def get(self):
url = blobstore.create_upload_url('/destination')
results = {'url': url}
self.response.headers['Content-Type'] = 'application/json'
self.response.write(json.dumps(results))
return
class urlDestination(blobstore_handlers.BlobstoreUploadHandler):
#assign blobkey to photo instance
def post(self):
upload = self.get_uploads()[0]
newPhoto = db_defs.Photos(photo=upload.key())
newPhoto.put()
results = {'key': newPhoto.key.id()}
self.response.headers['Content-Type'] = 'application/json'
self.response.write(json.dumps(results))
return
class ViewPhoto(blobstore_handlers.BlobstoreDownloadHandler):
def get(self, **kwargs):
if 'pid' in kwargs:
photo = ndb.Key(db_defs.Photos, int(kwargs['pid'])).get()
if not photo:
self.response.set_status(404)
self.response.write('Photo not found\n')
return
if not blobstore.get(photo.photo):
self.response.set_status(404)
self.response.write('Photo not found\n')
else:
img = images.get_serving_url(photo.photo)
results = {'url': img}
self.response.headers['Content-Type'] = 'application/json'
self.response.write(json.dumps(results))
return
class Photos(webapp2.RequestHandler):
def get(self, **kwargs):
#check to see if the request is in appropriate format
if 'application/json' not in self.request.accept:
self.response.set_status(406)
self.response.write('API only supports JSON requests\n')
return
#look for id in the args, if there, return info for just that id
if 'pid' in kwargs:
photo = ndb.Key(db_defs.Photos, int(kwargs['pid'])).get()
if not photo:
self.response.set_status(404)
self.response.write('Photo not found\n')
return
self.response.write(json.dumps(photo.to_dict()))
return
#if no specified id, return all photos
else:
q = db_defs.Photos.query()
photos = q.fetch()
out=[]
for p in photos:
photoDict = p.to_dict()
#request url for photo
url = images.get_serving_url(p.photo)
#add key for photo url
photoDict['url'] = url
out.append(photoDict)
self.response.headers['Content=Type'] = 'application/json'
self.response.write(json.dumps(out))
#updates a photo's description
def put(self, **kwargs):
if 'application/json' not in self.request.accept:
self.response.set_status(406)
self.response.write('API only supports JSON requests\n')
return
#Check that photo exists
if 'pid' in kwargs:
photo = ndb.Key(db_defs.Photos, int(kwargs['pid'])).get()
if not photo:
self.response.set_status(404)
self.response.write('Photo not found\n')
return
#retrieve data
description = self.request.get('description', default_value = None)
#updates values if present
if description:
photo.description = description
photo.put()
out = photo.to_dict()
self.response.headers['Content-Type'] = 'application/json'
self.response.write(json.dumps(out))
return
#deletes a specific photo
def delete(self, **kwargs):
#Check that photo exists
if 'pid' in kwargs:
photo = ndb.Key(db_defs.Photos, int(kwargs['pid'])).get()
if not photo:
self.response.set_status(404)
self.response.write('Photo not found\n')
return
#removes all references to photo from any Day object
q = db_defs.Day.query().fetch()
for d in db_defs.Day.query().fetch():
for p in d.photos:
if photo.key == p:
d.photos.remove(p)
d.put()
#delete blobstore blob
blobstore.delete(photo.photo)
#delete comments associated with photo
ndb.delete_multi(ndb.Query(ancestor=photo.key).iter(keys_only=True))
#delete photo
photo.key.delete()
#gather photos to show deletion
q = db_defs.Photos.query()
keys = q.fetch(keys_only=True)
results = {'keys': [x.id() for x in keys]}
self.response.headers['Content=Type'] = 'application/json'
self.response.write(json.dumps(results))
return
class Day(webapp2.RequestHandler):
#retrieves photos for a specific day
def get(self, **kwargs):
#check to see if the request is in appropriate format
if 'application/json' not in self.request.accept:
self.response.set_status(406)
self.response.write('API only supports JSON requests\n')
return
#Check that user exists
if 'uid' in kwargs:
user = ndb.Key(db_defs.Users, int(kwargs['uid'])).get()
if not user:
self.response.set_status(404)
self.response.write('User not found\n')
return
#Check that trip exists
if 'tid' in kwargs:
trip = ndb.Key(db_defs.Trip, int(kwargs['tid']), parent=user.key).get()
if not trip:
self.response.set_status(404)
self.response.write('Trip not found\n')
return
#Check that day exists
if 'did' in kwargs:
day = ndb.Key(db_defs.Day, int(kwargs['did']), parent=trip.key).get()
if not day:
self.response.set_status(404)
self.response.write('Day not found\n')
return
out=[]
for p in day.photos:
photo = p.get()
#get dictionary of photo attributes
photoDict = photo.to_dict()
#request url for photo
url = images.get_serving_url(photo.photo)
#add key for photo url
photoDict['url'] = url
out.append(photoDict)
self.response.headers['Content=Type'] = 'application/json'
self.response.write(json.dumps(out))
#adds a specific photo to specific user->trip->day
def post(self, **kwargs):
#check to see if the request is in appropriate format
if 'application/json' not in self.request.accept:
self.response.set_status(406)
self.response.write('API only supports JSON requests\n')
return
#Check that user exists
if 'uid' in kwargs:
user = ndb.Key(db_defs.Users, int(kwargs['uid'])).get()
if not user:
self.response.set_status(404)
self.response.write('User not found\n')
return
#Check that trip exists
if 'tid' in kwargs:
trip = ndb.Key(db_defs.Trip, int(kwargs['tid']), parent=user.key).get()
if not trip:
self.response.set_status(404)
self.response.write('Trip not found\n')
return
#Check that day exists
if 'did' in kwargs:
day = ndb.Key(db_defs.Day, int(kwargs['did']), parent=trip.key).get()
if not day:
self.response.set_status(404)
self.response.write('Day not found\n')
return
#Check that photo exists
if 'pid' in kwargs:
photo = ndb.Key(db_defs.Photos, int(kwargs['pid'])).get()
if not photo:
self.response.set_status(404)
self.response.write('Photo not found\n')
return
else:
self.response.set_status(400)
self.response.write('Resource not found\n')
return
#retrieve data
description = self.request.get('description', default_value = None)
#set photo values
if description:
photo.description = description
day.photos.append(photo.key)
photo.put()
day.put()
self.response.headers['Content-Type'] = 'application/json'
self.response.write(json.dumps(day.to_dict()))
return