Buscapé API C# Sample

BuscapeAPISample.cs

        // Realiza a busca no Buscapé e trata os resultados
        private async Task ExecuteSearchAsync(string uri, CancellationToken cancellationToken)
        {
            using (var request = new HttpRequestMessage(HttpMethod.Get, uri))
            {
                using (var cancellationTokenSource = new CancellationTokenSource(TimeSpan.FromSeconds(5)))
                {
                    var buscapeResponse = await WebClient.SendAsync(request, cancellationTokenSource.Token);
                    if (buscapeResponse.StatusCode != HttpStatusCode.OK)
                    {
                        Console.WriteLine(@"Não foi possível obter uma resposta do Buscapé!");
                    }
                    else
                    {
                        var resultJson = await buscapeResponse.Content.ReadAsStringAsync();
                        dynamic responseMessage = JsonConvert.DeserializeObject(resultJson);
                        try
                        {
                            foreach (JObject product in responseMessage.product)
                            {
                                try
                                {
                                    var resultItem = ParseProduct(product);
                                    await Console.WriteLine(resultItem);
                                }
                                catch (Exception e)
                                {
                                    Console.WriteLine($"Exception parsing product: {e}");
                                }
                            }
                        }
                        catch (Exception e)
                        {
                            Console.WriteLine($"Exception parsing response from Buscapé: {e}");
                            Console.WriteLine("Nenhum resultado encontrado");
                            return;
                        }
                        await Task.Delay(TimeSpan.FromSeconds(2), cancellationTokenSource.Token);
                        Console.WriteLine("Response sent!");
                    }
                }
            }
        }

        // Faz o parse do Json retornado pelo Buscapé
        private static string ParseProduct(JObject product)
        {
            var obj = product.Properties().First();
            var name = obj.Value["productname"]?.Value<string>() ??
                       obj.Value["productshortname"]?.Value<string>() ?? "Produto Desconhecido!";
            var pricemin = obj.Value["pricemin"]?.Value<string>();
            var pricemax = obj.Value["pricemax"]?.Value<string>();
            var text = name;
            if (pricemin != null && pricemax != null)
                text += $"\nDe R$ {pricemin} a R$ {pricemax}.";
            var thumbnail =
                obj.Value["thumbnail"]["formats"].Single(
                    f => f["formats"]["width"].Value<int>() == 100)["formats"]["url"]
                    .Value<string>();
            var link =
                obj.Value["links"].Single(
                    l => l["link"]["type"].Value<string>() == "product")["link"]["url"]
                    .Value<string>();
            
            var resultItem = $"{thumbnail} - {text} - {link}";
            return resultItem;
        }

        // Monta a uri de busca, dada uma keywork
        private async Task<string> ComposeSearchUriAsync(string keyword)
        {
            var originalKeyword = keyword;

            var categoryId = await DecodeCategoryIdAsync(keyword);
            if (categoryId > 0)
                keyword = string.Join("+", keyword.Split(' ').Skip(1));

            const int pageSize = 3;
            var page = 1;

            var parameters = $"myBuscapeAppToken/BR?results={pageSize}&page={page}&keyword={keyword}&format=json&sort=price";
            if (categoryId > 0)
                parameters += $"&categoryId={categoryId}";

            var uri = $"http://sandbox.buscape.com.br/service/findProductList/{parameters}";
            return uri;
        }

        // Identifica a categoria de busca, uma vez que o parametro keywork pode conter mais de uma palavra, e nesse caso a primeira deve ser considerada uma categoria
        private async Task<int> DecodeCategoryIdAsync(string keyword)
        {
            try
            {
                var keywords = keyword.Split(' ');
                if (keywords.Length > 1)
                {
                    var category = keywords[0];
                    var categoryParameters = $"myBuscapeAppToken/BR?keyword={category}&format=json";
                    var categoryUri = $"http://sandbox.buscape.com.br/service/findCategoryList/{categoryParameters}";
                    using (var request = new HttpRequestMessage(HttpMethod.Get, categoryUri))
                    {
                        using (var cancellationTokenSource = new CancellationTokenSource(TimeSpan.FromSeconds(5)))
                        {
                            var buscapeResponse = await WebClient.SendAsync(request, cancellationTokenSource.Token);
                            if (buscapeResponse.StatusCode != HttpStatusCode.OK)
                                return 0;
                            var resultJson = await buscapeResponse.Content.ReadAsStringAsync();
                            var responseMessage = JsonConvert.DeserializeObject<JObject>(resultJson);
                            return responseMessage["subcategory"][0]["subcategory"]["id"].Value<int>();
                        }
                    }
                }
                return 0;
            }
            catch (Exception)
            {
                return 0;
            }
        }