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polling_unit_lookup.py
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polling_unit_lookup.py
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import os
import re
import requests
from flask import Flask, request, jsonify
# These are hardcoded here rather than being introduced into the mapit database
# to avoid having a huge number of duplicated codes in MapIt. As it is largely
# a presentation thing though I don't think it is too big an issue.
state_number_to_letter_mappings = {
"1": "AB",
"2": "AD",
"3": "AK",
"4": "AN",
"5": "BA",
"6": "BY",
"7": "BE",
"8": "BO",
"9": "CR",
"10": "DE",
"11": "EB",
"12": "ED",
"13": "EK",
"14": "EN",
"15": "GO",
"16": "IM",
"17": "JI",
"18": "KD",
"19": "KN",
"20": "KT",
"21": "KE",
"22": "KO",
"23": "KW",
"24": "LA",
"25": "NA",
"26": "NI",
"27": "OG",
"28": "ON",
"29": "OS",
"30": "OY",
"31": "PL",
"32": "RI",
"33": "SO",
"34": "TA",
"35": "YO",
"36": "ZA",
"37": "FC",
}
def tidy_up_pun(pun):
"""
Tidy up the query into something that looks like PUNs we are expecting
"""
if not pun:
pun = ""
pun = pun.strip().upper()
pun = re.sub(r'[^A-Z\d]+', ':', pun) # separators to ':'
pun = re.sub(r'^0+', '', pun) # trim leading zeros at start of string
pun = re.sub(r':0+', ':', pun) # trim leading zeros for each component
# PUNs starting with a number shoud be converted to start with a state code
if re.match(r'^\d', pun):
state_number = pun.split(':')[0]
state_code = state_number_to_letter_mappings.get(state_number,
state_number)
pun = re.sub(r'^' + state_number, state_code, pun)
return pun
# A regular expression to match any PUN after it's been tidied
pun_re = re.compile('''
^(
[A-Z]{2}|
[A-Z]{2}:\d+|
[A-Z]{2}:\d+:\d+|
[A-Z]{2}:\d+:\d+:\d+
)$
''', re.VERBOSE)
app = Flask(__name__)
app.config['MAPIT_API_URL'] = os.environ.get(
'MAPIT_API_URL', 'http://nigeria.mapit.mysociety.org')
def mapit_url(pun):
return '{mapit}/code/poll_unit/{pun}'.format(
mapit=app.config['MAPIT_API_URL'],
pun=pun)
def get_area_from_pun(pun):
variations = [pun.rsplit(':', n)[0] for n in range(0, len(pun.split(':')))]
for pun_variation in variations:
r = requests.get(mapit_url(pun_variation))
if r.status_code == 200:
return r.json()
@app.route("/")
def lookup():
polling_unit_number = request.args.get('lookup')
pun = tidy_up_pun(polling_unit_number)
if not pun_re.search(pun):
error = 'Invalid polling unit: {}.'
return jsonify(code=400, error=error.format(polling_unit_number)), 400
area = get_area_from_pun(pun)
if not area:
error = 'No areas were found that matched polling unit: {}'
return jsonify(code=404, error=error.format(polling_unit_number)), 404
fmt = '{mapit}/area/{area_id}/covered'
url = fmt.format(mapit=app.config['MAPIT_API_URL'], area_id=area['id'])
states = requests.get(url, params={'type': 'STA'}).json()
federal_constituencies = requests.get(url, params={'type': 'FED'}).json()
senatorial_districts = requests.get(url, params={'type': 'SEN'}).json()
return jsonify({
'area': area,
'states': states.values(),
'federal_constituencies': federal_constituencies.values(),
'senatorial_districts': senatorial_districts.values(),
})
if __name__ == "__main__":
app.run(debug=True)