init push

internal/transport/http/handlers/attachment_resolver.go

@@ -0,0 +1,85 @@
+package handlers
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+
+	"github.com/gofiber/fiber/v2"
+
+	"wucher/internal/shared/pkg/attachmentresolver"
+	"wucher/internal/transport/http/jsonapi"
+	"wucher/internal/transport/http/response"
+)
+
+func resolveAttachmentIDFromInput(c *fiber.Ctx, params attachmentresolver.Params, errorTitle string) ([]byte, bool) {
+	attachmentID, err := attachmentresolver.Resolve(c.UserContext(), params)
+	if err == nil {
+		return attachmentID, false
+	}
+
+	var resolveErr *attachmentresolver.ResolveError
+	if errors.As(err, &resolveErr) {
+		switch resolveErr.Code {
+		case attachmentresolver.ErrorInvalidAttachmentUUID:
+			writeValidationError(c, fmt.Sprintf("%s is invalid UUID", fieldOrDefault(resolveErr.AttachmentField, "attachment_id")), "/data/attributes/"+fieldOrDefault(resolveErr.AttachmentField, "attachment_id"))
+			return nil, true
+		case attachmentresolver.ErrorInvalidFileUUID:
+			writeValidationError(c, fmt.Sprintf("%s is invalid UUID", fieldOrDefault(resolveErr.FileField, "file_id")), "/data/attributes/"+fieldOrDefault(resolveErr.FileField, "file_id"))
+			return nil, true
+		case attachmentresolver.ErrorAttachmentNotFound:
+			writeValidationError(c, fmt.Sprintf("%s not found", fieldOrDefault(resolveErr.AttachmentField, "attachment_id")), "/data/attributes/"+fieldOrDefault(resolveErr.AttachmentField, "attachment_id"))
+			return nil, true
+		case attachmentresolver.ErrorRequireValue:
+			writeValidationError(c, fmt.Sprintf("%s or %s is required", fieldOrDefault(resolveErr.AttachmentField, "attachment_id"), fieldOrDefault(resolveErr.FileField, "file_id")), "/data/attributes")
+			return nil, true
+		case attachmentresolver.ErrorCannotResolveFromFile:
+			writeValidationError(c, fmt.Sprintf("cannot resolve attachment from %s", fieldOrDefault(resolveErr.FileField, "file_id")), "/data/attributes/"+fieldOrDefault(resolveErr.FileField, "file_id"))
+			return nil, true
+		case attachmentresolver.ErrorFileNotReadyForAttachment:
+			writeValidationError(c, fmt.Sprintf("%s is not ready yet; wait for file.updated SSE event", fieldOrDefault(resolveErr.FileField, "file_id")), "/data/attributes/"+fieldOrDefault(resolveErr.FileField, "file_id"))
+			return nil, true
+		case attachmentresolver.ErrorFileManagerUnavailable:
+			writeBadRequestError(c, errorTitle, resolveErr.Error())
+			return nil, true
+		}
+	}
+
+	writeBadRequestError(c, errorTitle, err.Error())
+	return nil, true
+}
+
+func writeValidationError(c *fiber.Ctx, detail, pointer string) {
+	_ = response.WriteErrors(c, fiber.StatusUnprocessableEntity, []jsonapi.ErrorObject{{
+		Status: "422",
+		Title:  "Validation error",
+		Detail: detail,
+		Source: &jsonapi.ErrorSource{Pointer: pointer},
+	}})
+}
+
+func writeBadRequestError(c *fiber.Ctx, title, detail string) {
+	if title == "" {
+		title = "Request failed"
+	}
+	_ = response.WriteErrors(c, fiber.StatusBadRequest, []jsonapi.ErrorObject{{
+		Status: "400",
+		Title:  title,
+		Detail: detail,
+	}})
+}
+
+func fieldOrDefault(v string, fallback string) string {
+	if v == "" {
+		return fallback
+	}
+	return v
+}
+
+func hasNonEmptyOptionalString(v *string) bool {
+	return v != nil && strings.TrimSpace(*v) != ""
+}
+
+func hasBlankOptionalString(v *string) bool {
+	return v != nil && strings.TrimSpace(*v) == ""
+}