arcgis_api.py

# -*- coding: utf-8 -*-
from flask import Flask
from flask.helpers import url_for
from flask import request
import json
import re

app = Flask(__name__)

# helper method to extract parameters. reqest to api has the following format:
# /(endpoint)?filter_by[(filter_by_parameter)]=(keyword)
#
# example:
#   /geodata_structures?filter_by[field_name]=sample%20field_name
def read_params(params):
    filter_by      = re.search(r'filter_by\[(.*)\]', params).group(1)
    param_key = re.search(r'filter_by\[.*\]', params).group()
    keyword = request.args.get(param_key, '')

    return filter_by, keyword


@app.route('/geodata_elements', methods=['GET'])
def geodata_elements():

    filter_by, keyword = read_params(request.args.keys()[0])

    # TODO: Replace sample_data dict with database cache
    sample_data = [ {
          "name": "JR_REVIER_F",
          "alias": "Jagdreviergrenzen (Layer)",
          "type_of_features": "Layer",
          "path": "file://foo"
        },
        {
          "name": "ANJF_FREIGABE_JR_REVIER_F",
          "alias": "Jagdreviergrenzen (Flächen)",
          "type_of_features": "Polygon Features",
          "path": "file://foo"
        } ]

    geodata_elements = [gs for gs in sample_data if keyword in gs[filter_by] ]

    return json.dumps(geodata_elements)


@app.route('/geodata_structures', methods=['GET'])
def geodata_structures():

    filter_by, keyword = read_params(request.args.keys()[0])

    # TODO: Replace sample_data dict with database cache
    sample_data = [{
        'field_name' : 'sample field_name',
        'alias' : 'sample alias',
        'data_type' : 'sample data_type',
        'unit' : 'sample unit',
        'description' : 'sample description',
        'geodata_element_name' : 'JR_REVIER_F',
        }]

    geodata_structures = [gs for gs in sample_data if keyword in gs[filter_by] ]

    return json.dumps(geodata_structures)


if __name__ == "__main__":
    with app.test_request_context():
        print url_for('geodata_elements', param='')
        print url_for('geodata_structures', param='')
        app.debug = True
        app.run(host='127.0.0.1', port=3999)