Functions to get both legislators and district boundaries from teh OpenStates API

openstates-api-examples.php

<?php

			$state_legislators = $this->state_legislators($data['latitude'], $data['longitude']);
			$state_chambers = $this->process_legislators($state_legislators);


	function state_legislators($lat, $long) {
		
		$url = "http://openstates.org/api/v1/legislators/geo/?long=" . $long . "&lat=" . $lat . "&fields=state,chamber,district,full_name,url,photo_url&apikey=" . $this->config->item('sunlight_api_key');

		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL, $url);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
		$state_legislators=curl_exec($ch);
		curl_close($ch);


		$state_legislators = json_decode($state_legislators, true);

		return $state_legislators;				
		
	}
	

	
	function state_boundaries($state, $chamber) {
		
		$url = "http://openstates.org/api/v1/districts/" . $state . "/" . $chamber . "/?fields=name,boundary_id&apikey=" . $this->config->item('sunlight_api_key');

		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL, $url);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
		$state_boundaries=curl_exec($ch);
		curl_close($ch);

		$state_boundaries = json_decode($state_boundaries, true);
		$state_boundaries = $this->process_boundaries($state_boundaries);

		return $state_boundaries;

	}
	
	
	function state_boundary_shape($boundary_id) {
		
		$url = "http://openstates.org/api/v1/districts/boundary/" . $boundary_id . "/?apikey=" . $this->config->item('sunlight_api_key');

		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL, $url);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
		$shape_data=curl_exec($ch);
		curl_close($ch);

		$geojson = json_decode($shape_data, true);	

		$boundary_shape['coordinates'] = $geojson['shape'];
		$boundary_shape = json_encode($boundary_shape);

		$shape['shape'] = $boundary_shape;
		$shape['shape_center_lat'] = $geojson['region']['center_lat'];
		$shape['shape_center_long'] = $geojson['region']['center_lon'];		

		return $shape;

	}	
	
	
	
	function process_boundaries($boundary_array) {

		// Clean up data model
		foreach($boundary_array as $boundarydata){	

				$district = $boundarydata['name'];
				$boundary_id = $boundarydata['boundary_id'];

				$boundaries[$district]['boundary_id'] = $boundary_id;

		}

		return $boundaries;

	}	
	
	
	
function process_legislators($representatives) {
	
		// Get our current state
		$current_state = $representatives[0]['state'];
	
		// Clean up data model
		foreach($representatives as $repdata){
			
				$rep = array(
							'full_name' => $repdata['full_name']
							);
				
				// there are some missing fields on some entries, check for that
				if(isset($repdata['photo_url'])){
					$rep['photo_url'] = $repdata['photo_url'];
				}
				
				if(isset($repdata['url'])){
					$rep['url'] = $repdata['url'];
				}				
				
							
		
				$chamber = $repdata['chamber'];
				$district = $repdata['district'];
		
					
				$chambers[$chamber][$district]['reps'][] = $rep;	
			
		}	
		
		// Get the boundary_ids for this state
		$boundary_ids['upper'] = $this->state_boundaries($current_state, 'upper'); 
		$boundary_ids['lower'] = $this->state_boundaries($current_state, 'lower'); 	
		
			
		// Get shapes for each of the boundary ids we care about		
		while($districts = current($chambers)) {

			$this_chamber = key($chambers);
			if (!isset($current_chamber)) $current_chamber = '';
			
			// reset current district in case district ids are reused across chambers
			$current_district = '';			
			if ($current_chamber !== $this_chamber){
				
				while($district = current($districts)) {

					$this_district = key($districts);
					if (!isset($current_district)) $current_district = '';
					
					if ($current_district !== $this_district) {

						// get shape for this boundary id
						$boundary_id = $boundary_ids["$this_chamber"][$this_district]['boundary_id'];
											
						$shape = $this->state_boundary_shape($boundary_id);
						
						$chambers[$this_chamber][$this_district]['shape'] = $shape['shape'];
						$chambers[$this_chamber][$this_district]['centerpoint_latlong'] = $shape['shape_center_lat'] . ',' . $shape['shape_center_long'];					

					}	

				    $current_district = $this_district;
					next($districts);
				}

			}

		    $current_chamber = $this_chamber;
			next($chambers);
		}		
		
		
	
		return $chambers;
	
}	

?>