add cover url route

Dockerfile

@@ -3,7 +3,7 @@ FROM debian:latest
 
 # Update the package list and install MySQL client
 RUN apt-get update && apt-get install -y \
-    mariadb-client \
+    mariadb-client ca-certificates \
     && rm -rf /var/lib/apt/lists/*
 
 # Copy the preorder binary from the local directory into the container

orders/controllers.go

@@ -24,6 +24,21 @@ func FindOrder(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"data": order})
 }
 
+func FindOrderCover(c *gin.Context) {
+	var order Order
+
+	if err := config.DB.Where("id = ?", c.Param("id")).First(&order).Error; err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Record not found!"})
+	}
+	cover, err := order.fetchCoverImageURL()
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"cover_url": cover})
+}
+
 func CreateOrder(c *gin.Context) {
 	var input CreateOrderInput
 	if err := c.ShouldBindJSON(&input); err != nil {

orders/models.go

@@ -1,11 +1,17 @@
 package orders
 
 import (
+	"encoding/json"
+	"io"
+	"net/http"
 	"preorder/authors"
 	"preorder/formats"
+	"strconv"
 	"time"
 )
 
+const googleBooksAPI = "https://www.googleapis.com/books/v1/volumes?q=isbn:"
+
 type Order struct {
 	ID          uint   `json:"id" gorm:"primary_key"`
 	Title       string `json:"title"`
@@ -30,14 +36,38 @@ type UpdateOrderInput struct {
 	Title string `json:"title"`
 }
 
-func NewOrder(id uint, title string, author uint, format uint, isbn_13 uint, release_date time.Time) Order {
+func NewOrder(id uint, title string, author uint, format uint, isbn13 uint, releaseDate time.Time) Order {
 	order := Order{
 		ID:          id,
 		Title:       title,
 		AuthorID:    author,
 		FormatID:    format,
-		ISBN13:      isbn_13,
-		ReleaseDate: release_date,
+		ISBN13:      isbn13,
+		ReleaseDate: releaseDate,
 	}
 	return order
 }
+
+func (o *Order) fetchCoverImageURL() (string, error) {
+	resp, err := http.Get(googleBooksAPI + strconv.Itoa(int(o.ISBN13)))
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", err
+	}
+
+	var googleBooksResponse GoogleBooksResponse
+	if err := json.Unmarshal(body, &googleBooksResponse); err != nil {
+		return "", err
+	}
+
+	if len(googleBooksResponse.Items) > 0 {
+		return googleBooksResponse.Items[0].VolumeInfo.ImageLinks.Thumbnail, nil
+	}
+
+	return "", nil
+}

orders/router.go

@@ -4,6 +4,7 @@ import "github.com/gin-gonic/gin"
 
 func ApplyOrderRouter(router *gin.Engine) *gin.Engine {
 	router.GET("/orders", FindOrders)
+	router.GET("/orders/:id/cover", FindOrderCover)
 	router.POST("/orders", CreateOrder)
 	router.GET("/orders/:id", FindOrder)
 	router.PATCH("/orders/:id", UpdateOrder)

orders/types.go

@@ -0,0 +1,11 @@
+package orders
+
+type GoogleBooksResponse struct {
+	Items []struct {
+		VolumeInfo struct {
+			ImageLinks struct {
+				Thumbnail string `json:"thumbnail"`
+			} `json:"imageLinks"`
+		} `json:"volumeInfo"`
+	} `json:"items"`
+}

test.http

@@ -1,3 +1,7 @@
 ###
 GET http://localhost:8123/orders
 Content-Type: application/json
+
+###
+GET http://localhost:8123/orders/1/cover
+Content-Type: application/json