Add route to get a particular book

internal/routes/bookget.go

@@ -0,0 +1,47 @@
+package routes
+
+import (
+	"net/http"
+	"strconv"
+
+	"git.artlef.fr/PersonalLibraryManager/internal/appcontext"
+	"git.artlef.fr/PersonalLibraryManager/internal/model"
+	"git.artlef.fr/PersonalLibraryManager/internal/myvalidator"
+	"github.com/gin-gonic/gin"
+)
+
+type bookGet struct {
+	Title  string `json:"title" binding:"required,max=300"`
+	Author string `json:"author" binding:"max=100"`
+	Rating int    `json:"rating"`
+	Read   bool   `json:"read"`
+}
+
+func GetBookHandler(ac appcontext.AppContext) {
+	bookId, err := strconv.ParseUint(ac.C.Param("id"), 10, 64)
+	if err != nil {
+		ac.C.JSON(http.StatusBadRequest, gin.H{"error": err})
+		return
+	}
+	user, fetchUserErr := ac.GetAuthenticatedUser()
+	if fetchUserErr != nil {
+		myvalidator.ReturnErrorsAsJsonResponse(&ac, fetchUserErr)
+		return
+	}
+	err = myvalidator.ValidateId(ac.Db, uint(bookId), &model.Book{})
+	if err != nil {
+		myvalidator.ReturnErrorsAsJsonResponse(&ac, err)
+		return
+	}
+	var book bookGet
+	query := ac.Db.Model(&model.Book{})
+	query = query.Select("books.title, books.author, user_books.rating, user_books.read")
+	query = query.Joins("left join user_books on (user_books.book_id = books.id and user_books.user_id = ?)", user.ID)
+	query = query.Where("books.id = ?", bookId)
+	res := query.First(&book)
+	if res.Error != nil {
+		myvalidator.ReturnErrorsAsJsonResponse(&ac, err)
+		return
+	}
+	ac.C.JSON(http.StatusOK, book)
+}