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"