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refactor: deduplicate encryption helpers (#4146)

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David Luzar 2021-11-07 14:33:21 +01:00 • committed by GitHub
parent f59e608f18
commit 6143d5195a
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9 changed files with 84 additions and 148 deletions
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15
src/data/blob.ts
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@ -11,6 +11,7 @@ import { CanvasError } from "../errors";
import { t } from "../i18n";
import { calculateScrollCenter } from "../scene";
import { AppState, DataURL } from "../types";
import { bytesToHexString } from "../utils";
import { FileSystemHandle } from "./filesystem";
import { isValidExcalidrawData } from "./json";
import { restore } from "./restore";
@ -195,26 +196,18 @@ export const canvasToBlob = async (
/** generates SHA-1 digest from supplied file (if not supported, falls back
to a 40-char base64 random id) */
export const generateIdFromFile = async (file: File) => {
let id: FileId;
export const generateIdFromFile = async (file: File): Promise<FileId> => {
try {
const hashBuffer = await window.crypto.subtle.digest(
"SHA-1",
await file.arrayBuffer(),
);
id =
// convert buffer to byte array
Array.from(new Uint8Array(hashBuffer))
// convert to hex string
.map((byte) => byte.toString(16).padStart(2, "0"))
.join("") as FileId;
return bytesToHexString(new Uint8Array(hashBuffer)) as FileId;
} catch (error: any) {
console.error(error);
// length 40 to align with the HEX length of SHA-1 (which is 160 bit)
id = nanoid(40) as FileId;
return nanoid(40) as FileId;
}
return id;
};
export const getDataURL = async (file: Blob | File): Promise<DataURL> => {