added initial webhook main function

webhook.go

@@ -0,0 +1,162 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+	"strconv"
+	"time"
+
+	"github.com/debyltech/go-shippr/shippo"
+	"github.com/debyltech/go-snipcart/snipcart"
+	"github.com/debyltech/go-snipcart/snipcart/webhook"
+	"github.com/gin-gonic/gin"
+)
+
+const (
+	ValidateUrl string = "https://app.snipcart.com/api/requestvalidation/"
+)
+
+type ShippingWebhookEvent struct {
+	EventName string                 `json:"eventName"`
+	CreatedOn time.Time              `json:"createdOn"`
+	Order     snipcart.SnipcartOrder `json:"content"`
+}
+
+type ShippingRatesResponse struct {
+	Cost         float64 `json:"cost"`
+	Description  string  `json:"description"`
+	DeliveryDays int     `json:"guaranteedDaysToDelivery"`
+}
+
+func ValidateWebhook(token string) error {
+	validateRequest, err := http.Get(ValidateUrl + token)
+	if err != nil {
+		return err
+	}
+
+	if validateRequest.StatusCode < 200 || validateRequest.StatusCode >= 300 {
+		return errors.New("non-2XX response received")
+	}
+
+	return nil
+}
+
+func HandleShippingRates(config *webhook.Config, shippoClient *shippo.Client) gin.HandlerFunc {
+	fn := func(c *gin.Context) {
+		err := ValidateWebhook(c.GetHeader("X-Snipcart-RequestToken"))
+		if err != nil {
+			c.AbortWithError(http.StatusBadRequest, err)
+			return
+		}
+
+		var event ShippingWebhookEvent
+		err = json.NewDecoder(c.Request.Body).Decode(&event)
+		if err != nil {
+			c.AbortWithError(http.StatusInternalServerError, err)
+			return
+		}
+
+		defer c.Request.Body.Close()
+
+		var lineItems []shippo.LineItem
+		for _, v := range event.Order.Items {
+			lineItems = append(lineItems, shippo.LineItem{
+				Quantity:           v.Quantity,
+				TotalPrice:         fmt.Sprintf("%.2f", v.TotalPrice),
+				Currency:           event.Order.Currency,
+				Weight:             fmt.Sprintf("%.2f", v.Weight),
+				WeightUnit:         config.WeightUnit,
+				Title:              v.Name,
+				ManufactureCountry: config.ManufactureCountry,
+				Sku:                v.ID,
+			})
+		}
+
+		parcel := config.DefaultParcel
+		parcel.WeightUnit = config.WeightUnit
+		parcel.DistanceUnit = config.DimensionUnit
+		parcel.Weight = fmt.Sprintf("%.2f", event.Order.TotalWeight)
+
+		rateRequest := shippo.RateRequest{
+			AddressFrom: shippo.Address{
+				Name:       config.SenderAddress.Name,
+				Address1:   config.SenderAddress.Address1,
+				Address2:   config.SenderAddress.Address2,
+				City:       config.SenderAddress.City,
+				State:      config.SenderAddress.State,
+				Country:    config.SenderAddress.Country,
+				PostalCode: config.SenderAddress.PostalCode,
+			},
+			AddressTo: shippo.Address{
+				Name:       event.Order.Name,
+				Company:    event.Order.Company,
+				Address1:   event.Order.Address1,
+				Address2:   event.Order.Address2,
+				City:       event.Order.City,
+				Country:    event.Order.Country,
+				State:      event.Order.Province,
+				PostalCode: event.Order.PostalCode,
+				Phone:      event.Order.Phone,
+				Email:      event.Order.Email,
+			},
+			LineItems: lineItems,
+			Parcel:    parcel,
+		}
+
+		rateResponse, err := shippoClient.GenerateRates(rateRequest)
+		if err != nil {
+			c.AbortWithError(http.StatusBadRequest, err)
+			return
+		}
+
+		var rates []ShippingRatesResponse
+		for _, v := range rateResponse.Rates {
+			cost, err := strconv.ParseFloat(v.Amount, 64)
+			if err != nil {
+				c.AbortWithError(http.StatusInternalServerError, err)
+				return
+			}
+			rates = append(rates, ShippingRatesResponse{
+				Cost:         cost,
+				Description:  v.Title,
+				DeliveryDays: v.EstimatedDays,
+			})
+		}
+
+		c.JSON(http.StatusOK, rates)
+	}
+
+	return fn
+}
+
+func main() {
+	configPath := flag.String("config", "", "path to config.json")
+	flag.Parse()
+
+	if *configPath == "" {
+		log.Fatal("config path not defined")
+	}
+
+	config, err := webhook.NewConfigFromFile(*configPath)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	shippoClient := shippo.NewClient(config.ShippoApiKey)
+
+	r := gin.Default()
+
+	api := r.Group("/api")
+	{
+		v1 := api.Group("/v1")
+		{
+			v1.POST("/shipping", HandleShippingRates(config, &shippoClient))
+		}
+	}
+
+	r.Run("localhost:8081")
+}