47 lines
1.6 KiB
TypeScript
47 lines
1.6 KiB
TypeScript
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/**
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* Lazy loader + minimal typing for the vendored OxiCloud hash WASM
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* (`/vendors/hash-wasm/oxicloud_hash_wasm.js`) — the same BLAKE3 crate the
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* server and the delta worker use. Loaded on the main thread to compute a
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* small file's whole-file BLAKE3 for instant ("by-hash") upload; large files
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* hash off-thread inside the delta worker instead.
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*/
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interface HashWasmModule {
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/** wasm-bindgen init; resolves once the `.wasm` is instantiated. */
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default: () => Promise<unknown>;
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/** One-shot BLAKE3 of a buffer → 64-char lowercase hex. */
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blake3Hex: (data: Uint8Array) => string;
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}
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const WASM_GLUE_URL = '/vendors/hash-wasm/oxicloud_hash_wasm.js';
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let modPromise: Promise<HashWasmModule> | null = null;
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function load(): Promise<HashWasmModule> {
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if (!modPromise) {
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modPromise = (async () => {
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// Runtime URL of a vendored asset (not a project module) — keep Vite
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// from trying to resolve/bundle it, exactly like the delta worker does.
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const mod = (await import(/* @vite-ignore */ WASM_GLUE_URL)) as unknown as HashWasmModule;
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await mod.default();
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return mod;
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})().catch((err) => {
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modPromise = null; // let a later call retry after a transient failure
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throw err;
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});
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}
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return modPromise;
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}
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/**
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* Whole-file BLAKE3 (64-char lowercase hex) of `file`. Matches the server's
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* `file_hash` (BLAKE3 over the whole content), so it can be handed to
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* `/api/files/by-hash`. Reads the file fully into memory — intended for small
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* files only.
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*/
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export async function blake3HexOfFile(file: File): Promise<string> {
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const mod = await load();
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const bytes = new Uint8Array(await file.arrayBuffer());
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return mod.blake3Hex(bytes);
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}
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