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/*
This file is part of keks-meet (https://codeberg.org/metamuffin/keks-meet)
which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
Copyright (C) 2023 metamuffin <metamuffin.org>
*/
/// <reference lib="dom" />
import { display_filesize, e, sleep } from "../helper.ts";
import { log } from "../logger.ts";
import { StreamDownload } from "../download_stream.ts";
import { RemoteUser } from "../user/remote.ts";
import { LocalResource, ResourceHandlerDecl } from "./mod.ts";
import { tr } from "../locale.ts";
const MAX_CHUNK_SIZE = 1 << 15;
export const resource_file: ResourceHandlerDecl = {
kind: "file",
new_remote(info, user, enable) {
const download_button = e("button", {
onclick: self => {
enable()
self.textContent = tr("res.file.downloading")
self.disabled = true
}
}, tr("res.file.download"))
return {
info,
el: e("div", {},
e("span", {}, `${tr("res.file")}: ${JSON.stringify(info.label)} (${display_filesize(info.size!)})`),
download_button,
),
on_statechange(_s) { },
on_enable(channel, disable) {
if (!(channel instanceof RTCDataChannel)) throw new Error("not a data channel");
const display = transfer_status_el(user)
this.el.appendChild(display.el)
const reset = () => {
download_button.disabled = false
download_button.textContent = tr("res.file.download_again")
this.el.removeChild(display.el)
disable()
}
const download = StreamDownload(
{
size: info.size!,
filename: info.label ?? "file",
progress(position) {
display.status = `${display_filesize(position)} / ${display_filesize(info.size!)}`
display.progress = position / info.size!
},
cancel() {
channel.close()
log({ scope: "*", warn: true }, "download stream aborted")
reset()
}
}
);
let finished = false
channel.onopen = _ev => {
log("dc", `${user.display_name}: channel open`);
}
channel.onerror = _ev => {
log("dc", `${user.display_name}: channel error`);
}
channel.onclose = _ev => {
log("dc", `${user.display_name}: channel closed`);
if (!finished) {
log({ warn: true, scope: "dc" }, "transfer failed");
download.abort()
} else {
download.close()
}
reset()
}
channel.onmessage = ev => {
const data: Blob | ArrayBuffer | string = ev.data
console.log(data);
if (typeof data == "string") {
if (data == "end") {
finished = true
channel.close()
}
} else if (data instanceof Blob) {
const reader = new FileReader();
reader.onload = function (event) {
download.write(event.target!.result as ArrayBuffer)
};
reader.readAsArrayBuffer(data);
} else if (data instanceof ArrayBuffer) {
download.write(data)
}
}
}
}
}
}
export function create_file_res(): Promise<LocalResource> {
const picker = document.createElement("input")
picker.type = "file"
picker.click()
return new Promise((resolve, reject) => {
picker.addEventListener("change", () => {
if (!picker.files) return reject()
const f = picker.files.item(0)
if (!f) return reject()
resolve(file_res_inner(f))
})
})
}
function file_res_inner(file: File): LocalResource {
const transfers_el = e("div", {})
const transfers_abort = new Set<() => void>()
let destroy: () => void;
return {
info: { kind: "file", id: Math.random().toString(), label: file.name, size: file.size },
destroy() {
transfers_abort.forEach(abort => abort())
},
el: e("div", { class: "file" },
e("button", { class: "abort", onclick(_) { destroy() } }, tr("res.stop_sharing")),
e("span", {}, `Sharing file: ${JSON.stringify(file.name)}`),
transfers_el
),
set_destroy(cb) { destroy = cb },
on_request(user, create_channel) {
const channel = create_channel()
channel.bufferedAmountLowThreshold = 1 << 16 // this appears to be the buffer size in firefox for reading files
const reader = file.stream().getReader()
log("dc", `${user.display_name} started transfer`);
const display = transfer_status_el(user)
transfers_el.appendChild(display.el)
display.status = tr("status_await_channel_open")
let position = 0
const finish = async () => {
channel.send("end")
while (channel.bufferedAmount) {
display.status = tr("status.drain_buffer", { amount: channel.bufferedAmount.toString() })
await sleep(10)
}
display.status = tr("status.await_channel_close")
}
const feed = async () => {
const { value: chunk, done }: { value?: Uint8Array, done: boolean } = await reader.read()
if (done) return await finish()
if (!chunk) return console.warn("no chunk");
position += chunk.length
// bad spec: https://www.rfc-editor.org/rfc/rfc8831#name-transferring-user-data-on-a
// see https://github.com/webrtc-rs/webrtc/pull/304
for (let i = 0; i < chunk.length; i += MAX_CHUNK_SIZE) {
channel.send(chunk.slice(i, Math.min(i + MAX_CHUNK_SIZE, chunk.length)))
}
display.status = `${display_filesize(position)} / ${display_filesize(file.size!)}; (buffer=${display_filesize(channel.bufferedAmount)})`
display.progress = position / file.size!
}
const feed_until_full = async () => {
// this has to do with a bad browser implementation
// https://github.com/w3c/webrtc-pc/issues/1979
while (channel.bufferedAmount < channel.bufferedAmountLowThreshold * 2 && channel.readyState == "open") {
await feed()
}
}
const abort_cb = () => { channel.close(); }
channel.onbufferedamountlow = () => feed_until_full()
channel.onopen = _ev => {
display.status = tr("status.buffering")
log("dc", `${user.display_name}: channel open`);
feed_until_full()
}
channel.onerror = _ev => {
log("dc", `${user.display_name}: channel error`);
}
channel.onclosing = _ev => {
display.status = tr("status.closing")
}
channel.onclose = _ev => {
log("dc", `${user.display_name}: channel closed`);
transfers_el.removeChild(display.el)
transfers_abort.delete(abort_cb)
}
transfers_abort.add(abort_cb)
return channel
}
}
}
function transfer_status_el(remote: RemoteUser) {
const status = e("span", {}, "…")
const bar = e("div", { class: "progress-bar" });
return {
el: e("div", { class: "transfer-status" }, status, bar),
set status(s: string) {
status.textContent = `${remote.display_name}: ${s}`
},
set progress(n: number) {
bar.style.width = `${n * 100}%`
}
}
}
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