118 lines
2.8 KiB
TypeScript
118 lines
2.8 KiB
TypeScript
export const TRANSFER_CHUNK_SIZE = 64 * 1024;
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export const SIGNAL_POLL_INTERVAL_MS = 1000;
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interface TransferFileIdentity {
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name: string;
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lastModified: number;
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size: number;
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}
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export interface TransferFileDescriptor {
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id: string;
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name: string;
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size: number;
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contentType: string;
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relativePath: string;
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}
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export type TransferControlMessage =
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{
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type: 'manifest';
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files: TransferFileDescriptor[];
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}
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| {
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type: 'receive-request';
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fileIds: string[];
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archive: boolean;
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}
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| ({
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type: 'file-meta';
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} & TransferFileDescriptor)
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| {
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type: 'file-complete';
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id: string;
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}
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| {
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type: 'transfer-complete';
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};
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export function createTransferFileId(file: TransferFileIdentity) {
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return `${file.name}-${file.lastModified}-${file.size}`;
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}
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export function getTransferFileRelativePath(file: File) {
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const rawRelativePath = ('webkitRelativePath' in file && typeof file.webkitRelativePath === 'string' && file.webkitRelativePath)
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? file.webkitRelativePath
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: file.name;
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const normalizedPath = rawRelativePath
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.replaceAll('\\', '/')
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.split('/')
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.map((segment) => segment.trim())
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.filter(Boolean)
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.join('/');
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return normalizedPath || file.name;
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}
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export function createTransferFileManifest(files: File[]): TransferFileDescriptor[] {
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return files.map((file) => ({
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id: createTransferFileId(file),
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name: file.name,
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size: file.size,
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contentType: file.type || 'application/octet-stream',
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relativePath: getTransferFileRelativePath(file),
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}));
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}
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export function createTransferFileManifestMessage(files: TransferFileDescriptor[]) {
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return JSON.stringify({
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type: 'manifest',
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files,
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} satisfies TransferControlMessage);
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}
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export function createTransferReceiveRequestMessage(fileIds: string[], archive: boolean) {
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return JSON.stringify({
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type: 'receive-request',
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fileIds,
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archive,
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} satisfies TransferControlMessage);
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}
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export function createTransferFileMetaMessage(payload: TransferFileDescriptor) {
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return JSON.stringify({
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type: 'file-meta',
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...payload,
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} satisfies TransferControlMessage);
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}
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export function createTransferFileCompleteMessage(id: string) {
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return JSON.stringify({
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type: 'file-complete',
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id,
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} satisfies TransferControlMessage);
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}
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export function createTransferCompleteMessage() {
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return JSON.stringify({
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type: 'transfer-complete',
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} satisfies TransferControlMessage);
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}
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export function parseTransferControlMessage(payload: string): TransferControlMessage | null {
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try {
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return JSON.parse(payload) as TransferControlMessage;
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} catch {
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return null;
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}
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}
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export async function toTransferChunk(data: ArrayBuffer | Blob) {
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if (data instanceof Blob) {
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return new Uint8Array(await data.arrayBuffer());
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}
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return new Uint8Array(data);
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}
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