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ffmpeg.js
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ffmpeg.js
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var Logger = require("./logger");
var Config = require("./config");
var spawn = require("child_process").spawn;
var https = require("https");
var http = require("http");
var urlparse = require("url");
var path = require("path");
import { callOnce } from './util/call-once';
const CYTUBE_VERSION = require('../package.json').version;
const LOGGER = require('@calzoneman/jsli')('ffmpeg');
const ECODE_MESSAGES = {
ENOTFOUND: e => (
`Unknown host "${e.hostname}". ` +
'Please check that the link is correct.'
),
EPROTO: _e => 'The remote server does not support HTTPS.',
ECONNRESET: _e => 'The remote server unexpectedly closed the connection.',
ECONNREFUSED: _e => (
'The remote server refused the connection. ' +
'Please check that the link is correct and the server is running.'
),
ETIMEDOUT: _e => (
'The connection to the remote server timed out. ' +
'Please check that the link is correct.'
),
ENETUNREACH: _e => (
"The remote server's network is unreachable from this server. " +
"Please contact an administrator for assistance."
),
EHOSTUNREACH: _e => (
"The remote server is unreachable from this server. " +
"Please contact the video server's administrator for assistance."
),
ENOMEM: _e => (
"An out of memory error caused the request to fail. Please contact an " +
"administrator for assistance."
),
DEPTH_ZERO_SELF_SIGNED_CERT: _e => (
'The remote server provided an invalid ' +
'(self-signed) SSL certificate. Raw file support requires a ' +
'trusted certificate. See https://letsencrypt.org/ to get ' +
'a free, trusted certificate.'
),
SELF_SIGNED_CERT_IN_CHAIN: _e => (
'The remote server provided an invalid ' +
'(self-signed) SSL certificate. Raw file support requires a ' +
'trusted certificate. See https://letsencrypt.org/ to get ' +
'a free, trusted certificate.'
),
UNABLE_TO_VERIFY_LEAF_SIGNATURE: _e => (
"The remote server's SSL certificate chain could not be validated. " +
"Please contact the administrator of the server to correct their " +
"SSL certificate configuration."
),
CERT_HAS_EXPIRED: _e => (
"The remote server's SSL certificate has expired. Please contact " +
"the administrator of the server to renew the certificate."
),
ERR_TLS_CERT_ALTNAME_INVALID: _e => (
"The remote server's SSL connection is misconfigured and has served " +
"a certificate invalid for the given link."
),
// node's http parser barfs when careless servers ignore RFC 2616 and send a
// response body in reply to a HEAD request
HPE_INVALID_CONSTANT: _e => (
"The remote server for this link is misconfigured."
)
};
var USE_JSON = true;
var TIMEOUT = 30000;
var acceptedCodecs = {
"mov/h264": true,
"flv/h264": true,
"matroska/vp8": true,
"matroska/vp9": true,
"ogg/theora": true,
"mov/av1": true,
"matroska/av1": true
};
var acceptedAudioCodecs = {
"mp3": true,
"vorbis": true,
"aac": true,
"opus": true
};
var audioOnlyContainers = {
"mp3": true
};
function fflog() { }
/* eslint no-func-assign: off */
function initFFLog() {
if (fflog.initialized) return;
var logger = new Logger.Logger(path.resolve(__dirname, "..", "ffmpeg.log"));
fflog = function () {
logger.log.apply(logger, arguments);
};
fflog.initialized = true;
}
function fixRedirectIfNeeded(urldata, redirect) {
let parsedRedirect = urlparse.parse(redirect);
if (parsedRedirect.host === null) {
// Relative path, munge it to absolute
redirect = urldata.protocol + "//" + urldata.host + redirect;
}
return redirect;
}
function translateStatusCode(statusCode) {
switch (statusCode) {
case 400:
return "The request for the audio/video link was rejected as invalid. " +
"Contact support for troubleshooting assistance.";
case 401:
case 403:
return "Access to the link was denied. Contact the owner of the " +
"website hosting the audio/video file to grant permission for " +
"the file to be downloaded.";
case 404:
return "The requested link could not be found (404).";
case 405:
return "The website hosting the link does not support HEAD requests, " +
"so the link could not be retrieved.";
case 410:
return "The requested link does not exist (410 Gone).";
case 501:
return "The requested link could not be retrieved because the server " +
"hosting it does not support CyTube's request.";
case 500:
case 503:
return "The website hosting the audio/video link encountered an error " +
"and was unable to process the request. Try again in a few minutes, " +
"and if the issue persists, contact the owner of the website hosting " +
"the link.";
default:
return "An unknown issue occurred when requesting the audio/video link. " +
"Contact support for troubleshooting assistance.";
}
}
function getCookie(res) {
if (!res.headers['set-cookie']) {
return '';
}
return res.headers['set-cookie'].map(c => c.split(';')[0]).join(';') + ';';
}
function testUrl(url, cb, params = { redirCount: 0, cookie: '' }) {
const { redirCount, cookie } = params;
var data = urlparse.parse(url);
if (!/https:/.test(data.protocol)) {
if (redirCount > 0) {
// If the original URL redirected, the user is probably not aware
// that the link they entered (which was HTTPS) is redirecting to a
// non-HTTPS endpoint
return cb(`Unexpected redirect to a non-HTTPS link: ${url}`);
}
return cb("Only links starting with 'https://' are supported " +
"for raw audio/video support");
}
if (!data.hostname) {
return cb("The link to the file is missing the website address and can't " +
"be processed.");
}
var transport = (data.protocol === "https:") ? https : http;
data.method = "HEAD";
data.headers = {
'User-Agent': `CyTube/${CYTUBE_VERSION}`
};
if (cookie) {
data.headers['Cookie'] = cookie;
}
try {
var req = transport.request(data, function (res) {
req.abort();
if (res.statusCode === 301 || res.statusCode === 302) {
if (redirCount > 2) {
return cb("The request for the audio/video file has been redirected " +
"more than twice. This could indicate a misconfiguration " +
"on the website hosting the link. For best results, use " +
"a direct link. See https://git.io/vrE75 for details.");
}
const nextParams = {
redirCount: redirCount + 1,
cookie: cookie + getCookie(res)
};
return testUrl(fixRedirectIfNeeded(data, res.headers["location"]), cb,
nextParams);
}
if (res.statusCode !== 200) {
return cb(translateStatusCode(res.statusCode));
}
if (!/^audio|^video/.test(res.headers["content-type"])) {
cb("Could not detect a supported audio/video type. See " +
"https://git.io/fjtOK for a list of supported providers. " +
"(Content-Type was: '" + res.headers["content-type"] + "')");
return;
}
cb();
});
req.on("error", function (err) {
if (/hostname\/ip doesn't match/i.test(err.message)) {
cb("The remote server provided an invalid SSL certificate. Details: "
+ err.reason);
return;
} else if (ECODE_MESSAGES.hasOwnProperty(err.code)) {
cb(`${ECODE_MESSAGES[err.code](err)} (error code: ${err.code})`);
return;
}
LOGGER.error(
"Error sending preflight request: %s (code=%s) (link: %s)",
err.message,
err.code,
url
);
cb("An unexpected error occurred while trying to process the link. " +
"If this link is hosted on a server you own, it is likely " +
"misconfigured and you can join community support for assistance. " +
"If you are attempting to add links from third party websites, the " +
"developers do not provide support for this." +
(err.code ? (" Error code: " + err.code) : ""));
});
req.end();
} catch (error) {
LOGGER.error('Unable to make raw file probe request: %s', error.stack);
cb("An unexpected error occurred while trying to process the link. " +
"Try again, and contact support for further troubleshooting if the " +
"problem continues.");
}
}
function readOldFormat(buf) {
var lines = buf.split("\n");
var tmp = { tags: {} };
var data = {
streams: []
};
lines.forEach(function (line) {
if (line.match(/\[stream\]|\[format\]/i)) {
return;
} else if (line.match(/\[\/stream\]/i)) {
data.streams.push(tmp);
tmp = { tags: {} };
} else if (line.match(/\[\/format\]/i)) {
data.format = tmp;
tmp = { tags: {} };
} else {
var kv = line.split("=");
var key = kv[0].toLowerCase();
if (key.indexOf("tag:") === 0) {
tmp.tags[key.split(":")[1]] = kv[1];
} else {
tmp[key] = kv[1];
}
}
});
return data;
}
function isAlternateDisposition(stream) {
if (!stream.disposition) {
return false;
}
for (var key in stream) {
if (key !== "default" && stream.disposition[key]) {
return true;
}
}
return false;
}
function reformatData(data) {
var reformatted = {};
var duration = parseInt(data.format.duration, 10);
if (isNaN(duration)) duration = "--:--";
reformatted.duration = Math.ceil(duration);
var bitrate = parseInt(data.format.bit_rate, 10) / 1000;
if (isNaN(bitrate)) bitrate = 0;
reformatted.bitrate = bitrate;
reformatted.title = data.format.tags ? data.format.tags.title : null;
var container = data.format.format_name.split(",")[0];
var isVideo = false;
var audio = null;
for (var i = 0; i < data.streams.length; i++) {
const stream = data.streams[i];
// Trash streams with alternate dispositions, e.g. `attached_pic` for
// embedded album art on MP3s (not a real video stream)
if (isAlternateDisposition(stream)) {
continue;
}
if (stream.codec_type === "video" &&
!audioOnlyContainers.hasOwnProperty(container)) {
isVideo = true;
if (acceptedCodecs.hasOwnProperty(container + "/" + stream.codec_name)) {
reformatted.vcodec = stream.codec_name;
reformatted.medium = "video";
reformatted.type = [container, reformatted.vcodec].join("/");
if (stream.tags && stream.tags.title) {
reformatted.title = stream.tags.title;
}
return reformatted;
}
} else if (stream.codec_type === "audio" && !audio &&
acceptedAudioCodecs.hasOwnProperty(stream.codec_name)) {
audio = {
acodec: stream.codec_name,
medium: "audio"
};
if (stream.tags && stream.tags.title) {
audio.title = stream.tags.title;
}
}
}
// Override to make sure video files with no valid video streams but some
// acceptable audio stream are rejected.
if (isVideo) {
return reformatted;
}
if (audio) {
for (var key in audio) {
reformatted[key] = audio[key];
}
}
return reformatted;
}
exports.ffprobe = function ffprobe(filename, cb) {
fflog("Spawning ffprobe for " + filename);
var childErr;
var args = ["-show_streams", "-show_format", filename];
if (USE_JSON) args = ["-of", "json"].concat(args);
let child;
try {
child = spawn(Config.get("ffmpeg.ffprobe-exec"), args);
} catch (error) {
LOGGER.error("Unable to spawn() ffprobe process: %s", error.stack);
cb(error);
return;
}
var stdout = "";
var stderr = "";
var timer = setTimeout(function () {
LOGGER.warn("Timed out when probing " + filename);
fflog("Killing ffprobe for " + filename + " after " + (TIMEOUT/1000) + " seconds");
childErr = new Error(
"File query exceeded time limit of " + (TIMEOUT/1000) +
" seconds. This can be caused if the remote server is far " +
"away or if you did not encode the video " +
"using the 'faststart' option: " +
"https://trac.ffmpeg.org/wiki/Encode/H.264#faststartforwebvideo"
);
child.kill("SIGKILL");
}, TIMEOUT);
child.on("error", function (err) {
childErr = err;
});
child.stdout.on("data", function (data) {
stdout += data;
});
child.stderr.on("data", function (data) {
stderr += data;
if (stderr.match(/the tls connection was non-properly terminated/i)) {
fflog("Killing ffprobe for " + filename + " due to TLS error");
childErr = new Error("The connection was closed unexpectedly. " +
"If the problem continues, contact support " +
"for troubleshooting assistance.");
child.kill("SIGKILL");
}
});
child.on("close", function (code) {
clearTimeout(timer);
fflog("ffprobe exited with code " + code + " for file " + filename);
if (code !== 0) {
if (stderr.match(/unrecognized option|json/i) && USE_JSON) {
LOGGER.warn("ffprobe does not support -of json. " +
"Assuming it will have old output format.");
USE_JSON = false;
return ffprobe(filename, cb);
}
if (!childErr) childErr = new Error(stderr);
return cb(childErr);
}
var result;
if (USE_JSON) {
try {
result = JSON.parse(stdout);
} catch (e) {
return cb(new Error("Unable to parse ffprobe output: " + e.message));
}
} else {
try {
result = readOldFormat(stdout);
} catch (e) {
return cb(new Error("Unable to parse ffprobe output: " + e.message));
}
}
return cb(null, result);
});
};
exports.query = function (filename, cb) {
if (Config.get("ffmpeg.log") && !fflog.initialized) {
initFFLog();
}
if (!Config.get("ffmpeg.enabled")) {
return cb("Raw file playback is not enabled on this server");
}
if (!filename.match(/^https:\/\//)) {
return cb("Raw file playback is only supported for links accessible via HTTPS. " +
"Ensure that the link begins with 'https://'.");
}
testUrl(filename, callOnce(function (err) {
if (err) {
return cb(err);
}
exports.ffprobe(filename, function (err, data) {
if (err) {
if (err.code && err.code === "ENOENT") {
return cb("Failed to execute `ffprobe`. Set ffmpeg.ffprobe-exec " +
"to the correct name of the executable in config.yaml. " +
"If you are using Debian or Ubuntu, it is probably " +
"avprobe.");
} else if (err.message) {
if (err.message.match(/protocol not found/i))
return cb("Link uses a protocol unsupported by this server's " +
"version of ffmpeg. Some older versions of " +
"ffprobe/avprobe do not support HTTPS.");
if (err.message.match(/exceeded time limit/) ||
err.message.match(/closed unexpectedly/i)) {
return cb(err.message);
}
// Ignore ffprobe error messages, they are common and most often
// indicate a problem with the remote file, not with this code.
if (!/(av|ff)probe/.test(String(err)))
LOGGER.error(err.stack || err);
return cb("An unexpected error occurred while trying to process " +
"the link. Contact support for troubleshooting " +
"assistance.");
} else {
if (!/(av|ff)probe/.test(String(err)))
LOGGER.error(err.stack || err);
return cb("An unexpected error occurred while trying to process " +
"the link. Contact support for troubleshooting " +
"assistance.");
}
}
try {
data = reformatData(data);
} catch (e) {
LOGGER.error(e.stack || e);
return cb("An unexpected error occurred while trying to process " +
"the link. Contact support for troubleshooting " +
"assistance.");
}
if (data.medium === "video") {
data = {
title: data.title || "Raw Video",
duration: data.duration,
bitrate: data.bitrate,
codec: data.type
};
cb(null, data);
} else if (data.medium === "audio") {
data = {
title: data.title || "Raw Audio",
duration: data.duration,
bitrate: data.bitrate,
codec: data.acodec
};
cb(null, data);
} else {
return cb("File did not contain an acceptable codec. See " +
"https://git.io/vrE75 for details.");
}
});
}));
};