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import { fileOpen, fileSave } from "./filesystem";
import { cleanAppStateForExport, clearAppStateForDatabase } from "../appState";
import {
DEFAULT_FILENAME,
EXPORT_DATA_TYPES,
EXPORT_SOURCE,
MIME_TYPES,
VERSIONS,
} from "../constants";
import { clearElementsForDatabase, clearElementsForExport } from "../element";
import type { ExcalidrawElement } from "../element/types";
import type { AppState, BinaryFiles, LibraryItems } from "../types";
import { isImageFileHandle, loadFromBlob, normalizeFile } from "./blob";
import type {
ExportedDataState,
ImportedDataState,
ExportedLibraryData,
ImportedLibraryData,
} from "./types";
/**
* Strips out files which are only referenced by deleted elements
*/
const filterOutDeletedFiles = (
elements: readonly ExcalidrawElement[],
files: BinaryFiles,
) => {
const nextFiles: BinaryFiles = {};
for (const element of elements) {
if (
!element.isDeleted &&
"fileId" in element &&
element.fileId &&
files[element.fileId]
) {
nextFiles[element.fileId] = files[element.fileId];
}
}
return nextFiles;
};
export const serializeAsJSON = (
elements: readonly ExcalidrawElement[],
appState: Partial<AppState>,
files: BinaryFiles,
type: "local" | "database",
): string => {
const data: ExportedDataState = {
type: EXPORT_DATA_TYPES.excalidraw,
version: VERSIONS.excalidraw,
source: EXPORT_SOURCE,
elements:
type === "local"
? clearElementsForExport(elements)
: clearElementsForDatabase(elements),
appState:
type === "local"
? cleanAppStateForExport(appState)
: clearAppStateForDatabase(appState),
files:
type === "local"
? filterOutDeletedFiles(elements, files)
: // will be stripped from JSON
undefined,
};
return JSON.stringify(data, null, 2);
};
export const saveAsJSON = async (
elements: readonly ExcalidrawElement[],
appState: AppState,
files: BinaryFiles,
/** filename */
name: string = appState.name || DEFAULT_FILENAME,
) => {
const serialized = serializeAsJSON(elements, appState, files, "local");
const blob = new Blob([serialized], {
type: MIME_TYPES.excalidraw,
});
const fileHandle = await fileSave(blob, {
name,
extension: "excalidraw",
description: "Excalidraw file",
fileHandle: isImageFileHandle(appState.fileHandle)
? null
: appState.fileHandle,
});
return { fileHandle };
};
export const loadFromJSON = async (
localAppState: AppState,
localElements: readonly ExcalidrawElement[] | null,
) => {
const file = await fileOpen({
description: "Excalidraw files",
// ToDo: Be over-permissive until https://bugs.webkit.org/show_bug.cgi?id=34442
// gets resolved. Else, iOS users cannot open `.excalidraw` files.
// extensions: ["json", "excalidraw", "png", "svg"],
});
return loadFromBlob(
await normalizeFile(file),
localAppState,
localElements,
file.handle,
);
};
export const isValidExcalidrawData = (data?: {
type?: any;
elements?: any;
appState?: any;
}): data is ImportedDataState => {
return (
data?.type === EXPORT_DATA_TYPES.excalidraw &&
(!data.elements ||
(Array.isArray(data.elements) &&
(!data.appState || typeof data.appState === "object")))
);
};
export const isValidLibrary = (json: any): json is ImportedLibraryData => {
return (
typeof json === "object" &&
json &&
json.type === EXPORT_DATA_TYPES.excalidrawLibrary &&
(json.version === 1 || json.version === 2)
);
};
export const serializeLibraryAsJSON = (libraryItems: LibraryItems) => {
const data: ExportedLibraryData = {
type: EXPORT_DATA_TYPES.excalidrawLibrary,
version: VERSIONS.excalidrawLibrary,
source: EXPORT_SOURCE,
libraryItems,
};
return JSON.stringify(data, null, 2);
};
export const saveLibraryAsJSON = async (libraryItems: LibraryItems) => {
const serialized = serializeLibraryAsJSON(libraryItems);
await fileSave(
new Blob([serialized], {
type: MIME_TYPES.excalidrawlib,
}),
{
name: "library",
extension: "excalidrawlib",
description: "Excalidraw library file",
},
);
};
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