How do use Google Maps Places Autocomplete REST API in Salesforce

Question

Does anyone have any example Apex code or Salesforce Lightning JavaScript code for using the Google Maps Places Autocomplete REST API within Salesforce?

Specifically to perform a GET request to end point:

https://maps.googleapis.com/maps/api/place/autocomplete/json?input={input}&key={api-key}

And return the response data.

Either client-side Salesforce Lightning or Server-side Apex example code/classes would be great.

Reference

• Google Maps API Place Autocomplete Documentation

NOTE: I've included my Apex code as a potential answer.

Answer 1

This Apex class returns a PlaceAutocompleteResponse object.

Usage

String input = 'Amoeba';
String types = 'address';
String components = 'country:GB';

GoogleMapsAutoCompleteAPI api = new GoogleMapsAutoCompleteAPI()
PlaceAutocompleteResponse response = api.getAutoComplete(input, types, components);

Apex GoogleMapsAutoCompleteAPI Class

public class GoogleMapsAutoCompleteAPI {

    // Google Maps API Place Autocomplete
    // Documentation: https://developers.google.com/places/web-service/autocomplete

    public PlaceAutocompleteResponse getAutoComplete(String input, String types, String components) {
        String url = 'https://maps.googleapis.com/maps/api/place/autocomplete/json?input='
            + EncodingUtil.urlEncode(input, 'UTF-8')
            + '&components=' + components // country:uk'
            + '&types=' + types
            + '&key=' + getGoogleMapsAPIKey();

        return PlaceAutocompleteResponse.parse(makeAPICall(url));
    }

    private string makeAPICall(string url) {

        Http http = new Http();
        HttpRequest httpRequest = new HttpRequest();
        HttpResponse httpResponse = new HttpResponse();
        httpRequest.setMethod('GET');
        httpRequest.setEndpoint(url);
        httpRequest.setTimeout(120000);
        httpResponse = http.send(httpRequest); 

        if (httpResponse.getStatusCode() == 200){
            return httpResponse.getBody();    
        } else {
            System.debug(httpResponse.getStatusCode());
            System.debug(httpResponse.getBody());
            throw new AuraHandledException(httpResponse.getBody());
        } 
    }

    private string getAPIKey() {
        return ''; // add api key or get from custom settings
    }
}

Apex PlaceAutocompleteResponse Class

public class PlaceAutocompleteResponse {

    public class Matched_substrings {
        public Integer length;
        public Integer offset;
    }

    public String status;
    public List<Predictions> predictions;

    public class Predictions {
        public String description;
        public String id;
        public List<Matched_substrings> matched_substrings;
        public String place_id;
        public String reference;
        public List<Terms> terms;
        public List<String> types;
    }

    public class Terms {
        public Integer offset;
        public String value;
    }

    public static PlaceAutocompleteResponse parse(String json) {
         return (PlaceAutocompleteResponse) System.JSON.deserialize(json, PlaceAutocompleteResponse.class);
    }
}