feat: image variants engine

api/pkg/apperr/messages.go

@@ -42,3 +42,14 @@ const OwnerOrAdminRequiredErrorMessage = "Only owners and admins can do this."
 const PurgeConflictErrorMessage = "The library changed, so nothing was purged. Check the new summary and try again."
 const PurgeBusyErrorMessage = "A purge is already running."
 const PurgeIntervalErrorMessage = "Enter a whole number of days between 1 and 365."
+const VariantNotFoundErrorMessage = "Variant not found"
+const VariantNameErrorMessage = "Use lowercase letters, numbers and dashes, 2 to 32 characters."
+const VariantDimensionsErrorMessage = "Width and height must be between 1 and 8000, and one of them is required."
+const VariantFitErrorMessage = "Fit must be cover, contain or inside."
+const VariantQualityErrorMessage = "Quality must be between 1 and 100."
+const VariantInvalidErrorMessage = "The variant is not valid."
+const VariantExistsErrorMessageFormat = "A variant named “%s” already exists. Choose another name."
+const VariantFormatErrorMessageFormat = "Format must be %s."
+const VariantSourceTooLargeErrorMessage = "The source image is too large to generate this variant."
+const VariantUnknownMessage = "Unknown variant"
+const VariantUnsupportedParameterMessage = "Unsupported parameter"

api/pkg/validator/validator.go

@@ -1,12 +1,14 @@
 package validator
 
 import (
+	"RenewCMS/internal/domain/image"
 	"regexp"
 
 	"github.com/go-playground/validator/v10"
 )
 
 const inviteEmailTag = "inviteemail"
+const variantNameTag = "variantname"
 
 var inviteEmailPattern = regexp.MustCompile(`^[^\s@]+@[^\s@.]+(\.[^\s@.]+)+$`)
 
@@ -15,6 +17,11 @@ var Validate *validator.Validate
 func InitValidator() {
 	Validate = validator.New()
 	_ = Validate.RegisterValidation(inviteEmailTag, isInviteEmail)
+	_ = Validate.RegisterValidation(variantNameTag, isVariantName)
+}
+
+func isVariantName(field validator.FieldLevel) bool {
+	return image.IsValidVariantName(field.Field().String())
 }
 
 func isInviteEmail(field validator.FieldLevel) bool {