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httpStorage.ts
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httpStorage.ts
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// Inspired and partly copied from https://gitlab.com/kiliandeca/excalidraw-fork
// MIT, Kilian Decaderincourt
// Adapted by SWEETGOOD (https://sweetgood.de)
import { reconcileElements } from "../../packages/excalidraw";
import type {
ExcalidrawElement,
FileId
} from "../../packages/excalidraw/element/types";
import { getSceneVersion } from "../../packages/excalidraw/element";
import type Portal from "../collab/Portal";
import { restoreElements } from "../../packages/excalidraw/data/restore";
import type {
AppState,
BinaryFileData,
BinaryFileMetadata,
DataURL,
} from "../../packages/excalidraw/types";
import { decompressData } from "../../packages/excalidraw/data/encode";
import {
encryptData,
decryptData,
IV_LENGTH_BYTES
} from "../../packages/excalidraw/data/encryption";
import { MIME_TYPES } from "../../packages/excalidraw/constants";
import type { SyncableExcalidrawElement } from ".";
import { getSyncableElements } from ".";
import type { RemoteExcalidrawElement } from "../../packages/excalidraw/data/reconcile";
import { StoredScene } from "./StorageBackend";
import type { Socket } from "socket.io-client";
const HTTP_STORAGE_BACKEND_URL = import.meta.env.VITE_APP_HTTP_STORAGE_BACKEND_URL;
const SCENE_VERSION_LENGTH_BYTES = 4
// There is a lot of intentional duplication with the firebase file
// to prevent modifying upstream files and ease futur maintenance of this fork
const httpStorageSceneVersionCache = new WeakMap<
Socket,
number
>();
export const isSavedToHttpStorage = (
portal: Portal,
elements: readonly ExcalidrawElement[],
): boolean => {
if (portal.socket && portal.roomId && portal.roomKey) {
const sceneVersion = getSceneVersion(elements);
return httpStorageSceneVersionCache.get(portal.socket) === sceneVersion;
}
// if no room exists, consider the room saved so that we don't unnecessarily
// prevent unload (there's nothing we could do at that point anyway)
return true;
};
export const saveToHttpStorage = async (
portal: Portal,
elements: readonly SyncableExcalidrawElement[],
appState: AppState,
) => {
const { roomId, roomKey, socket } = portal;
if (
// if no room exists, consider the room saved because there's nothing we can
// do at this point
!roomId ||
!roomKey ||
!socket ||
isSavedToHttpStorage(portal, elements)
) {
return false;
}
const sceneVersion = getSceneVersion(elements);
const getResponse = await fetch(
`${HTTP_STORAGE_BACKEND_URL}/rooms/${roomId}`,
);
if (!getResponse.ok && getResponse.status !== 404) {
return false;
};
if(getResponse.status === 404) {
const result: boolean = await saveElementsToBackend(roomKey, roomId, [...elements], sceneVersion)
if(result) {
return {
reconciledElements: null
}
}
return false
};
// If room already exist, we compare scene versions to check
// if we're up to date before saving our scene
const buffer = await getResponse.arrayBuffer();
const sceneVersionFromRequest = parseSceneVersionFromRequest(buffer);
if (sceneVersionFromRequest >= sceneVersion) {
return false;
}
const existingElements = await getElementsFromBuffer(buffer, roomKey);
const reconciledElements = getSyncableElements(
reconcileElements(elements, existingElements as RemoteExcalidrawElement[], appState),
);
const result: boolean = await saveElementsToBackend(roomKey, roomId, reconciledElements, sceneVersion)
if (result) {
httpStorageSceneVersionCache.set(socket, sceneVersion);
return {
reconciledElements: elements
};
}
return false;
};
export const loadFromHttpStorage = async (
roomId: string,
roomKey: string,
socket: Socket | null,
): Promise<readonly ExcalidrawElement[] | null> => {
const HTTP_STORAGE_BACKEND_URL = import.meta.env.VITE_APP_HTTP_STORAGE_BACKEND_URL;
const getResponse = await fetch(
`${HTTP_STORAGE_BACKEND_URL}/rooms/${roomId}`,
);
const buffer = await getResponse.arrayBuffer();
const elements = await getElementsFromBuffer(buffer, roomKey);
if (socket) {
httpStorageSceneVersionCache.set(socket, getSceneVersion(elements));
}
return restoreElements(elements, null);
};
const getElementsFromBuffer = async (
buffer: ArrayBuffer,
key: string,
): Promise<readonly ExcalidrawElement[]> => {
// Buffer should contain both the IV (fixed length) and encrypted data
const sceneVersion = parseSceneVersionFromRequest(buffer);
const iv = new Uint8Array(buffer.slice(SCENE_VERSION_LENGTH_BYTES, IV_LENGTH_BYTES + SCENE_VERSION_LENGTH_BYTES));
const encrypted = buffer.slice(IV_LENGTH_BYTES + SCENE_VERSION_LENGTH_BYTES, buffer.byteLength);
return await decryptElements(
{ sceneVersion: sceneVersion, ciphertext: encrypted, iv },
key
);
};
export const saveFilesToHttpStorage = async ({
prefix,
files,
}: {
prefix: string;
files: { id: FileId; buffer: Uint8Array }[];
}) => {
const erroredFiles = new Map<FileId, true>();
const savedFiles = new Map<FileId, true>();
const HTTP_STORAGE_BACKEND_URL = import.meta.env.VITE_APP_HTTP_STORAGE_BACKEND_URL;
await Promise.all(
files.map(async ({ id, buffer }) => {
try {
const payloadBlob = new Blob([buffer]);
const payload = await new Response(payloadBlob).arrayBuffer();
await fetch(`${HTTP_STORAGE_BACKEND_URL}/files/${id}`, {
method: "PUT",
body: payload,
});
savedFiles.set(id, true);
} catch (error: any) {
erroredFiles.set(id, true);
}
}),
);
return { savedFiles, erroredFiles };
};
export const loadFilesFromHttpStorage = async (
prefix: string,
decryptionKey: string,
filesIds: readonly FileId[],
) => {
const loadedFiles: BinaryFileData[] = [];
const erroredFiles = new Map<FileId, true>();
//////////////
await Promise.all(
[...new Set(filesIds)].map(async (id) => {
try {
const HTTP_STORAGE_BACKEND_URL = import.meta.env.VITE_APP_HTTP_STORAGE_BACKEND_URL;
const response = await fetch(`${HTTP_STORAGE_BACKEND_URL}/files/${id}`);
if (response.status < 400) {
const arrayBuffer = await response.arrayBuffer();
const { data, metadata } = await decompressData<BinaryFileMetadata>(
new Uint8Array(arrayBuffer),
{
decryptionKey,
},
);
const dataURL = new TextDecoder().decode(data) as DataURL;
loadedFiles.push({
mimeType: metadata.mimeType || MIME_TYPES.binary,
id,
dataURL,
created: metadata?.created || Date.now(),
});
} else {
erroredFiles.set(id, true);
}
} catch (error: any) {
erroredFiles.set(id, true);
console.error(error);
}
}),
);
//////
return { loadedFiles, erroredFiles };
};
const saveElementsToBackend = async (roomKey: string, roomId: string, elements: SyncableExcalidrawElement[], sceneVersion: number) => {
const { ciphertext, iv } = await encryptElements(roomKey, elements);
// Concatenate Scene Version, IV with encrypted data (IV does not have to be secret).
const numberBuffer = new ArrayBuffer(4);
const numberView = new DataView(numberBuffer);
numberView.setUint32(0, sceneVersion, false);
const sceneVersionBuffer = numberView.buffer;
const payloadBlob = await new Response(new Blob([sceneVersionBuffer, iv.buffer, ciphertext])).arrayBuffer();
const putResponse = await fetch(
`${HTTP_STORAGE_BACKEND_URL}/rooms/${roomId}`,
{
method: "PUT",
body: payloadBlob,
},
);
return putResponse.ok
}
const parseSceneVersionFromRequest = (buffer: ArrayBuffer) => {
const view = new DataView(buffer);
return view.getUint32(0, false);
}
const decryptElements = async (
data: StoredScene,
roomKey: string,
): Promise<readonly ExcalidrawElement[]> => {
const ciphertext = data.ciphertext;
const iv = data.iv;
const decrypted = await decryptData(iv, ciphertext, roomKey);
const decodedData = new TextDecoder("utf-8").decode(
new Uint8Array(decrypted),
);
return JSON.parse(decodedData);
};
const encryptElements = async (
key: string,
elements: readonly ExcalidrawElement[],
): Promise<{ ciphertext: ArrayBuffer; iv: Uint8Array }> => {
const json = JSON.stringify(elements);
const encoded = new TextEncoder().encode(json);
const { encryptedBuffer, iv } = await encryptData(key, encoded);
return { ciphertext: encryptedBuffer, iv };
};