Searching by store name and receiving a list of stores with matching names (Java)

In this use case, the user types the name of a seller that he wants to buy from. This usually happens when the user knows the store is open and also has the items he wants to buy.

Code snippets

Client calls the BAP server to trigger search:

    @PostMapping("/local_retail/search_store_name")
    public ResponseEntity searchByStoreName(
            @RequestHeader HttpHeaders headers,
            @RequestBody ClientSearchRequest request) {
        var response = bapApplicationService.generateSearchRequest(request, headers);
        return ResponseEntity.ok(response);
    }

BAP server generates the protocol request body

/*
Example Request JSON:
{
    "context": {
        "domain": "local_retail",
        "country": "IND",
        "city": "std:080",
        "action": "search",
        "core_version": "0.9.2",
        "bap_id": "https://mock_bap.com/",
        "bap_uri": "https://mock_bap.com/beckn/",
        "transaction_id": "1239890342",
        "message_id": "123793824",
        "timestamp": "2021-03-23T10:00:40.065Z"
    },
    "message": {
        "intent" : {
            "provider": {
                "descriptor" : {
                    "name" : "Stores"
                }
            },
            "fulfillment": {
                "end": {
                    "location": {
                        "gps": "12.4535445,77.9283792"
                    }
                }
            }
        }
    }
}
*/

    public Response generateSearchRequest(ClientSearchRequest request, HttpHeaders headers) { {

        var messageId = UUID.randomUUID().toString();

        // Check and create transaction id if not passed
        var txnId = StringUtils.hasText(request.getTransactionId())
                ? request.getTransactionId()
                : UUID.randomUUID().toString();

        // Construct the request
        var context = Context.builder().domain(request.getDomain())
                .action(Context.ActionEnum.search)
                .messageId(messageId)
                .transactionId(txnId)
                .transactionId(UUID.randomUUID().toString())
                .timestamp(new Date().toString())
                .build();
        var intentBuilder = Intent.builder();

        // Construct provider object for the request from store name
        intentBuilder = intentBuilder.provider(ClientAssembler.of(request.getProvider()));

        var searchRequest = SearchRequest.builder()
                .context(context)
                .message(SearchMessage.builder()
                        .intent(intentBuilder.build()).build()).build();

        return invokeSearch(searchRequest, headers);
    }
}

BAP server calls protocol search to the network

    public Response invokeSearch(SearchRequest request, HttpHeaders headers) {

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

        //Call BPP Search api
        var searchResponse = apiClient.post(url[0] + Context.ActionEnum.search,
                constructRequestHeaders(),
                request,
                Response.class);
        if (responseEntity.getBody() == null || responseEntity.getBody().getError() != null ||
                "NACK".equals(responseEntity.getBody().getMessage().getAck().getStatus())) {
            // Return custom error to the client
            return null;
        }
        return searchResponse.getBody();
    }

BAP receives protocol on_search

/*
Example Response JSON:
{
    "context": {
        "domain": "local_retail",
        "country": "IND",
        "city": "std:080",
        "action": "on_search",
        "core_version": "0.9.2",
        "bap_id": "https://mock_bap.com/",
        "bap_uri": "https://mock_bap.com/beckn/",
        "transaction_id": "1239890342",
        "message_id": "123793824",
        "timestamp": "2021-06-23T09:53:38.872Z"
    },
    "message": {
        "catalog": {
            "bpp/descriptor": {
                "name": "Mock BPP"
            },
            "bpp/providers": [
                {
                    "id": "pooja-stores",
                    "descriptor": {
                        "name": "Pooja Stores"
                    }
                },
                {
                    "id": "nilgiri-stores",
                    "descriptor": {
                        "name": "Nilgiri Stores"
                    }
                },
                {
                    "id": "food-store",
                    "descriptor": {
                        "name": "Food Store"
                    }
                }
            ]
        }
    }
}
*/
    @PostMapping("/bap/on_search")
    public ResponseEntity onSearch(
            @RequestHeader HttpHeaders headers,
            @RequestBody OnSearchRequest request) {
        var response = bapCallbackApplicationService.onSearch(request, headers);
        return ResponseEntity.ok(response);
    }

    public Response onSearch(OnSearchRequest request, HttpHeaders headers) {
        // Validate the headers received
        var isHeadersValid = validateHeaders(headers);
        // Construct and return error if the received headers are invalid
        if (!isHeadersValid) return null;

        // Store the data received based on message id for the client to poll
        saveToDB(request);

        return Response.of("ACK", null);
    }

Client polls BAP to get the on_search results

    // Endpoint for the client to poll the search data based on the message id
    @GetMapping("/local_retail/on_search")
    public ResponseEntity searchByMessageId(
            @PathVariable(ClientRoutes.PARAM_MESSAGE_ID) String messageId,
            @RequestHeader HttpHeaders headers) {
        var data = bapApplicationService.get(messageId);
        return ResponseEntity.ok(data);
    }