Feat: Add JWT config, auth middleware, and token parsing using username.

Signed-off-by: Goldbro233 <bowensun_06@outlook.com>

controllers/ex_controller.go

@@ -0,0 +1,43 @@
+package controllers
+
+import (
+	"GinTutorial/global"
+	"GinTutorial/models"
+	"net/http"
+	"time"
+
+	"github.com/gin-gonic/gin"
+)
+
+func CreateExchangeRate(ctx *gin.Context) {
+	var exchangeRate models.ExchangeRate
+
+	if err := ctx.ShouldBindJSON(&exchangeRate); err != nil {
+		ctx.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	exchangeRate.Date = time.Now()
+
+	if err := global.Db.AutoMigrate(&exchangeRate); err != nil {
+		ctx.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	if err := global.Db.Create(&exchangeRate).Error; err != nil {
+		ctx.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	ctx.JSON(http.StatusCreated, gin.H{"data": exchangeRate})
+}
+
+func GetExchangeRates(ctx *gin.Context) {
+	var exchangeRates []models.ExchangeRate
+
+	if err := global.Db.Find(&exchangeRates).Error; err != nil {
+		ctx.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+	ctx.JSON(http.StatusOK, gin.H{"data": exchangeRates})
+}