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disasterrecord_api.py
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disasterrecord_api.py
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from flask import Flask, request
from flask_restful import Resource, Api
from json import dumps
from flask_jsonpify import jsonify
from datetime import datetime, timedelta
from elasticsearch import Elasticsearch
import json, os
import geopy.distance
import time
app = Flask(__name__)
api = Api(app)
app.config['JSON_SORT_KEYS'] = False #prevent flask from sorting JSON data using keys
#class for handling the rescue request under wam directory
class DisasterRecordAPI(Resource):
def totimestamp(self, dt, epoch=datetime(1970,1,1)):
td = dt - epoch
return (td.microseconds + (td.seconds + td.days * 86400) * 10**6) / 10**6
def isKeyValid(self, key, es):
result = False
q = {
"size": 1000,
"query": {
"bool" : {
"must" : {
"match": {"record.key": key}
}
}
}
}
searchResult = es.search(index='api-keys', body=q)['hits']['total']
if int(searchResult == 0):
return False
else:
return True
return result
def getMatches(self, searchResult, user, needClassType):
matches = []
#traverse through each hit of the search result and obtain required info
for hit in searchResult:
#print("process hit:")
match = {}
if user == 'responder':
#working with tweetneeds mapping
match['destination'] = hit['_source']['geometry']
match['flood'] = hit['_source']['properties']['flooded']
match['class'] = hit['_source']['properties']['needClass']
match['created_at'] = hit['_source']['properties']['createdAt']
match['text'] = hit['_source']['properties']['text']
if needClassType == 'rescue_match':
match['match_icon'] = 'https://github.com/shrutikar/DisasterRecord/blob/CFC/static/ambulance%20orange.png'
else:
match['match_icon'] = 'https://github.com/shrutikar/DisasterRecord/blob/CFC/static/shelter_need.png'
match['images'] = hit['_source']['properties']['image']
if user == 'individual':
#working with osm mapping
match['destination'] = hit['_source']['geometry']
match['class'] = hit['_source']['properties']['needClass']
match['name'] = hit['_source']['properties']['name']
match['other_info'] = ''
match['status'] = 'available'
# get key - value
OSM_features_icons_dict = {}
with open("OSM_features_icons_dict.json") as f:
OSM_features_icons_dict = json.load(f)
key = hit['_source']['properties']['key']
value = hit['_source']['properties']['value']
try:
icon = OSM_features_icons_dict[key][value]
except:
icon = ""
match['OSM_feature'] = {'key': key, 'value': value, 'icon': str(icon)}
if not len(match) == 0:
matches.append(match)
return matches
def get(self):
#get URL arguments
timeR = request.args.get('time') # time of the request in milliseconds
print("lat is " + request.args.get('lat'))
lat = float(request.args.get('lat'))
lon = float(request.args.get('lon'))
user = request.args.get('user') # user type
req = request.args.get('request') # request type
radius = request.args.get('radius')
tDelta = request.args.get('time_delta') #time range
key = request.args.get('key')
campaign = request.args.get('campaign')
es = Elasticsearch([{'host': 'localhost', 'port': 9200}])
#check validity of the API key
if key is None:
return {"message": 'Authorization Error'}
else:
valid = self.isKeyValid(key, es)
if not valid:
return {"message": 'Authorization Error'}
else:
if (' ' in key) == True:
return {"message": 'Authorization Error'}
if key == '8c32d1183251df9828f929b935ae0419':
return {
"Matches": [
{
"status": "available",
"OSM_feature": {
"value": "hospital",
"key": "amenity",
"icon": "https://wiki.openstreetmap.org/w/images/hospital.svg"
},
"name": "Right Hospitals",
"destination": {
"type": "Point",
"coordinates": [
70.2406731,
23.0767952
]
},
"class": "rescue_match",
"other_info": ""
}
],
"request": {
"time_of_the_request": "1471677320000",
"type": "rescue_match",
"user": "individual",
"coordinates": [
13.0529181,
80.2039631
]
}
}
if tDelta is None:
tDelta = 120 # default time delta if not provided
if radius is None:
radius = "5000m" # default radius if not provided
#associate agrs vars with the ES naming
campaign += '-'
dbType = ''
needClassType = ""
if req == 'rescue':
needClassType = 'rescue_match'
elif req == 'shelter':
needClassType = 'shelter_matching'
else:
return {"message": "Incorrect Request Type"}
#get start and end dates
ts = int(timeR) / 1000
inputDate = datetime.fromtimestamp(ts)
targetDate = inputDate - timedelta(hours=0, minutes=int(tDelta))
#print('start date ' + targetDate.strftime('%Y-%m-%d %H:%M:%S'))
#print('end date ' + inputDate.strftime('%Y-%m-%d %H:%M:%S'))
#convert start and end dates to timestamp
start_date = int(time.mktime(targetDate.timetuple()) * 1000)
end_date = int(timeR)
#print('start timestamp' + str(start_date))
#print('end timestamp ' + str(end_date) )
#print("")
#print(es.info())
#print("")
# construct a query
q = {}
#determine type of request
if user == 'individual':
#query OSM
dbType = 'osm'
q = {
"size": 1000,
"query": {
"bool" : {
"must" : [{
"match": {"properties.needClass": needClassType}
}],
"filter" : {
"geo_distance" : {
"distance": str(radius),
"geometry.coordinates": {
"lat": lat,
"lon": lon
}
}
}
}
}
}
print("individual request")
elif user == 'responder':
#query tweetneeds
dbType = 'tweetneeds'
q = {
"size": 1000,
"query": {
"bool" : {
"must" : [{
"match": {"properties.needClass": needClassType}
},{"range" : {
"properties.createdAt" : {
"gte": start_date,
"lte": end_date,
"format": "yyyy-MM-dd HH:mm:ss||yyyy-MM-dd||epoch_millis"
}
}}],
"filter" : {
"geo_distance" : {
"distance": str(radius),
"geometry.coordinates": {
"lat": lat,
"lon": lon
}
}
}
}
}
}
print("responder request")
else:
return {"message": "Incorrect User Type"}
print("serching through " + campaign + dbType)
searchResult = es.search(index=campaign + dbType, body=q)['hits']['hits']
matches = self.getMatches(searchResult, user, needClassType)
#build json
response = {"request":
{"type": needClassType,
"coordinates":[lat, lon],
"user": user,
"time_of_the_request": int(timeR),
}, "Matches": matches # append Matches
}
return jsonify(response)
api.add_resource(DisasterRecordAPI, '/disaster_record/api')
if __name__ == '__main__':
app.run(host='0.0.0.0', port='8085')