feat(API): media library

api/pkg/apperr/messages.go

@@ -25,3 +25,7 @@ const InviteInvalidErrorMessage = "This invite link doesn't work."
 const InviteExpiredErrorMessage = "This invite has expired."
 const OwnerRequiredErrorMessage = "Only the owner can do this."
 const UsernameTakenErrorMessage = "That username is taken. Try another."
+const MediaQueryErrorMessage = "The media query is invalid."
+const MediaFilenameErrorMessage = "Enter a filename."
+const MediaMergeConflictErrorMessage = "Some of the images to merge changed. Refresh and try again."
+const MediaMergeRequestErrorMessage = "Choose an image to keep and at least one other image to merge into it."

api/pkg/upload/upload.go

@@ -0,0 +1,49 @@
+package upload
+
+import (
+	"RenewCMS/api/pkg/apperr"
+	"RenewCMS/internal/domain/image"
+	"errors"
+	"net/http"
+)
+
+const multipartOverheadAllowance = 1 << 20
+
+const fileField = "file"
+
+func ReadImageInput(w http.ResponseWriter, r *http.Request, uploadedById uint32) (image.ImageInput, func(), bool) {
+	r.Body = http.MaxBytesReader(w, r.Body, image.MaxImageSize+multipartOverheadAllowance)
+
+	file, header, err := r.FormFile(fileField)
+	if err != nil {
+		var tooLarge *http.MaxBytesError
+		if errors.As(err, &tooLarge) {
+			http.Error(w, image.ErrImageTooLarge.Error(), http.StatusRequestEntityTooLarge)
+			return image.ImageInput{}, nil, false
+		}
+		http.Error(w, apperr.BodyErrorMessage, http.StatusBadRequest)
+		return image.ImageInput{}, nil, false
+	}
+
+	input := image.ImageInput{
+		Content:      file,
+		Filename:     header.Filename,
+		Size:         header.Size,
+		ContentType:  header.Header.Get("Content-Type"),
+		UploadedByID: uploadedById,
+	}
+	return input, func() { _ = file.Close() }, true
+}
+
+func WriteCreateError(w http.ResponseWriter, err error) {
+	switch {
+	case errors.Is(err, image.ErrImageTypeNotAllowed):
+		http.Error(w, err.Error(), http.StatusUnsupportedMediaType)
+	case errors.Is(err, image.ErrImageTooLarge):
+		http.Error(w, err.Error(), http.StatusRequestEntityTooLarge)
+	case errors.Is(err, image.ErrImageUnreadable):
+		http.Error(w, err.Error(), http.StatusBadRequest)
+	default:
+		http.Error(w, "Internal server error", http.StatusInternalServerError)
+	}
+}