Sending the details of providers of a mobility service aggregator (Java)

In this use case, the user views the mobility services of an aggregator. The aggregator is usually a BPP that has multiple providers in its catalog. So it returns the mobility services

Code snippets

BPP receives protocol search

/*
Example Request JSON:
{
    "context": {
        "domain": "nic2004:60221",
        "country": "IND",
        "city": "std:080",
        "action": "search",
        "core_version": "0.9.1",
        "bap_id": "https://mock_bap.com/",
        "bap_uri": "https://mock_bap.com/beckn/",
        "transaction_id": "1209849124",
        "message_id": "12341242342",
        "timestamp": "2021-03-23T10:00:40.065Z"
    },
    "message": {
        "intent" : {
            "fulfillment": {
                "start" : {
                    "location" : {
                        "gps" : "12.9349377,77.6055586"
                    }
                },
                "end" : {
                    "location" : {
                        "gps" : "12.4535445,77.9283792"
                    }
                }
            }
        }
    }
}
*/
    // BPP Search endpoint
    @PostMapping("/bpp/search")
    public ResponseEntity search(
            @RequestHeader HttpHeaders headers,
            @RequestBody SearchRequest request) {
        var response = bppApplicationService.search(request, headers);
        return ResponseEntity.ok(response);
    }

BPP processes the search

    public Response search(SearchRequest request, HttpHeaders headers) {
        var searchResponse = new OnSearchRequest();
        // Validate the headers
        var isHeadersValid = validateHeaders(headers);
        // Construct and return error
        if (!isHeadersValid) return null;

        // Fetch the data based on the request
        var requestIntent = request.getMessage().getIntent();

        // Execute business logic here

        // Generate the response
        searchResponse = generateSearchResponse(searchResult);

        //invoke on_search api
        return invokeOnSearch(searchResponse, headers);
    }
}

BPP generates response

/*
Example Response JSON:
{
    "context": {
        "domain": "nic2004:60221",
        "country": "IND",
        "city": "std:080",
        "action": "on_search",
        "core_version": "0.9.1",
        "bap_id": "https://mock_bap.com/",
        "bap_uri": "https://mock_bap.com/beckn/",
        "bpp_id": "https://mock_bpp.com/",
        "bpp_uri": "https://mock_bpp.com/beckn/",
        "transaction_id": "1209849124",
        "message_id": "12341242343",
        "timestamp": "2021-03-23T10:00:40.065Z"
    },
    "message": {
        "catalog": {
            "bpp/descriptor": {
                "name": "Big Mobility"
            },
            "bpp/providers": [
                {
                    "id": "yellow-mobility",
                    "descriptor" : {
                        "name": "Yellow Cabs"
                    },
                    "locations": [
                        {
                            "id": "closest-suv-spot",
                            "gps": "12.9349377,77.6055586"
                        },
                        {
                            "id": "closest-sedan-spot",
                            "gps": "12.9349377,77.6055586"
                        },
                        {
                            "id": "closest-sedan-outstation",
                            "gps": "12.9349377,77.6055586"
                        }
                    ],
                    "categories": [
                        {
                            "id": "spot_booking",
                            "descriptor": {
                                "name": "Spot booking"
                            }
                        },
                        {
                            "id": "outstation",
                            "descriptor": {
                                "name": "Outstation"
                            }
                        }
                    ],
                    "items": [
                        {
                            "id": "sedan_spot",
                            "descriptor" : {
                                "name" : "4 seater Sedan",
                                "images" : [
                                    "https://mock_bpp.com/images/sedan.jpg"
                                ]
                            },
                            "category_id": "spot_booking",
                            "location_id": "closest-sedan-spot",
                            "price" : {
                                "currency": "INR",
                                "value": "170"
                            },
                            "time": {
                                "label": "ETA",
                                "duration": "P14M"
                            },
                            "matched": true
                        },
                        {
                            "id": "suv_spot",
                            "descriptor" : {
                                "name" : "6 seater SUV ",
                                "images" : [
                                    "https://mock_bpp.com/images/suv.jpg"
                                ]
                            },
                            "category_id": "spot_booking",
                            "location_id": "closest-suv-spot",
                            "price" : {
                                "currency": "INR",
                                "value": "290"
                            },
                            "time": {
                                "label": "ETA",
                                "duration": "P12M"
                            },
                            "matched": true
                        },
                        {
                            "id": "sedan_outstation",
                            "descriptor" : {
                                "name" : "4 Seater Sedan",
                                "images" : [
                                    "https://mock_bpp.com/images/sedan-out.jpg"
                                ]
                            },
                            "category_id": "outstation",
                            "location_id": "closest-sedan-outstation",
                            "price" : {
                                "currency": "INR",
                                "value": "570"
                            },
                            "time": {
                                "label": "ETA",
                                "duration": "P17M"
                            },
                            "matched": true
                        }
                    ]
                },
                {
                    "id": "red-mobility",
                    "descriptor": {
                        "name": "Cabs 4 All"
                    },
                    "locations": [
                        {
                            "id": "closest-sedan",
                            "gps": "12.9349377,77.6055586"
                        }
                    ],
                    "categories": [
                        {
                            "id": "rental",
                            "descriptor": {
                                "name": "Rental"
                            }
                        }
                    ],
                    "items": [
                        {
                            "id": "sedan_rental",
                            "descriptor" : {
                                "name" : "Sedan 5 hours",
                                "images" : [
                                    "https://mock_bpp.com/images/sedan_rental.jpg"
                                ]
                            },
                            "category_id": "rental",
                            "location_id": "closest-sedan",
                            "price" : {
                                "currency": "INR",
                                "value": "200"
                            },
                            "time": {
                                "label": "ETA",
                                "duration": "P12M"
                            },
                            "matched": true
                        }
                    ]
                }
            ]
        }
    }
}
*/
    public OnSearchRequest generateSearchResponse(List searchResult) {
        var searchResult = SearchResponseBuilder.builder.result(searchResult).build();
        // Convert response into protocol object similar to example above
        return searchResult;
    }

BPP calls protocol on_search

    public Response invokeOnSearch(OnSearchRequest searchResponse, HttpHeaders headers) {
        if(searchResponse.getError() == null) {
            // Call BAP on_search api with the search response

            // Call to look up function which returns the the public key and BAP/BG Endpoint to be called 
            var url = lookUp(headers);

            var response = apiClient.post(url[0] + Context.ActionEnum.on_search,
                    constructResponseHeaders(),
                    searchResponse,
                    OnSearchRequest.class);
            return Response.of("ACK", null);
        } else {
            return Response.of("NACK", null);
        }
    }