primer intento de servicio para acortar urls

repository/CrearUrl.go

@@ -0,0 +1,47 @@
+package repository
+
+import (
+	"crypto/sha3"
+	"fmt"
+	"url-short/models"
+
+	"gorm.io/gorm"
+)
+
+func CrearUrl(longURL string, db *gorm.DB) (string, error) {
+	// checkeamos por longurl repetida
+	counturl := int64(0)
+	result := db.Model(&models.Url{}).Where("longurl = ?", longURL).Count(&counturl)
+	if result.Error != nil {
+		return "", result.Error
+	}
+	if counturl != 0 {
+		println(1)
+		var short models.Url
+		result = db.Model(&short).Where("longurl = ?", longURL).Select("shorturl").First(&short)
+		if result.Error != nil {
+			return "", result.Error
+		}
+		return short.Shorturl, nil
+	}
+
+	// shortURL := base64.StdEncoding.EncodeToString([]byte(longURL))[:10]
+	sha := sha3.New224()
+	sha.Write([]byte(longURL))
+	shortURL := fmt.Sprintf("%x", sha.Sum(nil))[:10]
+
+	result = db.Model(&models.Url{}).Where("shorturl = ?", shortURL).Count(&counturl)
+	if result.Error != nil {
+		return "", result.Error
+	}
+	if counturl != 0 {
+		return shortURL, nil
+	}
+
+	result = db.Create(&models.Url{Longurl: longURL, Shorturl: shortURL})
+
+	if result.Error != nil {
+		return "", result.Error
+	}
+	return shortURL, nil
+}