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Test real signed video ranges in the background, then safely reorder Bilibili's native CDN URLs without forging Akamai signatures.
// ==UserScript==
// @name Bilibili Accelerator
// @name:zh-CN Bilibili Accelerator
// @namespace https://github.com/stabruriss/bilibili-accelerator
// @version 0.2.5
// @description Test real signed video ranges in the background, then safely reorder Bilibili's native CDN URLs without forging Akamai signatures.
// @description:zh-CN 后台实测当前视频的真实签名分片，安全重排主备 CDN；不伪造 Akamai 签名，不制造并发取消风暴。
// @author stabruriss
// @license MIT
// @homepageURL https://github.com/stabruriss/bilibili-accelerator
// @supportURL https://github.com/stabruriss/bilibili-accelerator/issues
// @match https://www.bilibili.com/*
// @match https://m.bilibili.com/*
// @run-at document-start
// @grant none
// @noframes
// ==/UserScript==
(function bootstrap(root, factory) {
'use strict';
const core = factory();
// Keeping the core importable makes URL/signature handling testable with
// Node without executing the browser hooks.
if (
typeof module === 'object' &&
module.exports &&
typeof process === 'object' &&
process.versions?.node
) {
module.exports = core;
return;
}
core.install(root);
})(
typeof unsafeWindow !== 'undefined' ? unsafeWindow : globalThis,
function createBiliAutoCdn() {
'use strict';
const VERSION = '0.2.5';
const CACHE_VERSION = 1;
const CACHE_KEY = 'kota.biliAutoCdn.health.v1';
const ENABLED_KEY = 'kota.biliAutoCdn.enabled';
const SETTINGS_KEY = 'kota.biliAutoCdn.settings.v1';
const UI_POSITION_KEY = 'kota.biliAutoCdn.uiPosition.v1';
const NATIVE_AKAMAI_ROUTE = 'native-akamai';
const HEALTH_TTL_MS = 4 * 60 * 60 * 1000;
const FAILED_HEALTH_TTL_MS = 15 * 60 * 1000;
const HEALTH_VERIFY_INTERVAL_MS = 15 * 60 * 1000;
const PROBE_DELAY_MS = 1200;
const PROBE_TIMEOUT_MS = 6500;
const PROBE_BYTES = 256 * 1024;
const PROBE_RANGES = Object.freeze([
[0, PROBE_BYTES - 1],
[1024 * 1024, 1024 * 1024 + PROBE_BYTES - 1]
]);
const VERIFY_SLOW_MIN_MS = 750;
const VERIFY_SLOW_FACTOR = 3;
const MAX_PROBE_HOSTS = 5;
const MAX_ORIGINAL_PROBE_HOSTS = 2;
const MAX_PRESET_PROBE_HOSTS = 3;
const UI_LAUNCHER_SIZE = 30;
const UI_VIEWPORT_MARGIN = 8;
const UI_DRAG_THRESHOLD_PX = 5;
// These are generic UPOS targets verified to accept an ordinary signed
// bilivideo URL. Akamai is deliberately absent: it needs an API-native
// hdnts URL and may never be synthesized by swapping a hostname.
const SAFE_GENERIC_HOSTS = Object.freeze([
'upos-sz-mirrorcosov.bilivideo.com',
'upos-sz-mirroraliov.bilivideo.com',
'cn-hk-eq-01-03.bilivideo.com'
]);
const DEFAULT_SETTINGS = Object.freeze({
version: 1,
enabled: true,
mode: 'auto',
manualTarget: SAFE_GENERIC_HOSTS[0],
autoProbe: true
});
function normalizeSettings(value, legacyEnabled = true) {
const input =
value && typeof value === 'object' ? value : {};
const mode = input.mode === 'manual' ? 'manual' : 'auto';
const allowedManualTargets = [
NATIVE_AKAMAI_ROUTE,
...SAFE_GENERIC_HOSTS
];
return {
version: DEFAULT_SETTINGS.version,
enabled:
typeof input.enabled === 'boolean'
? input.enabled
: !!legacyEnabled,
mode,
manualTarget: allowedManualTargets.includes(
input.manualTarget
)
? input.manualTarget
: DEFAULT_SETTINGS.manualTarget,
autoProbe:
typeof input.autoProbe === 'boolean'
? input.autoProbe
: DEFAULT_SETTINGS.autoProbe
};
}
const PLAYURL_PATHS = new Set([
'/x/player/wbi/playurl',
'/x/player/playurl',
'/pgc/player/web/v2/playurl',
'/pgc/player/web/playurl',
'/pugv/player/web/playurl'
]);
const MEDIA_PATH_RE = /\.(?:m4s|mp4|flv|m3u8)(?:$|[?#])/i;
const IPV4_RE = /^(?:\d{1,3}\.){3}\d{1,3}$/;
const PCDN_SUFFIXES = Object.freeze([
'.szbdyd.com',
'.mountaintoys.cn',
'.nexusedgeio.com',
'.ahdohpiechei.com'
]);
function stableUnique(values) {
const seen = new Set();
const result = [];
for (const value of values || []) {
if (typeof value !== 'string' || !value || seen.has(value)) {
continue;
}
seen.add(value);
result.push(value);
}
return result;
}
function defaultUiPosition(
viewportWidth,
viewportHeight,
viewportLeft = 0,
viewportTop = 0
) {
const width = Math.max(0, Number(viewportWidth) || 0);
const height = Math.max(0, Number(viewportHeight) || 0);
const left = Number(viewportLeft) || 0;
const top = Number(viewportTop) || 0;
return {
x:
left +
Math.max(
0,
width - UI_LAUNCHER_SIZE - 18
),
y:
top +
Math.max(
0,
height - UI_LAUNCHER_SIZE - 72
)
};
}
function clampedUiAxis(value, viewportStart, viewportSize) {
const available = viewportSize - UI_LAUNCHER_SIZE;
if (available <= 0) {
return viewportStart;
}
const margin = Math.min(
UI_VIEWPORT_MARGIN,
available / 2
);
const minimum = viewportStart + margin;
const maximum =
viewportStart + available - margin;
return Math.round(
Math.min(maximum, Math.max(minimum, value))
);
}
function clampUiPosition(
position,
viewportWidth,
viewportHeight,
viewportLeft = 0,
viewportTop = 0
) {
const width = Math.max(0, Number(viewportWidth) || 0);
const height = Math.max(0, Number(viewportHeight) || 0);
const left = Number(viewportLeft) || 0;
const top = Number(viewportTop) || 0;
const fallback = defaultUiPosition(
width,
height,
left,
top
);
const x =
typeof position?.x === 'number' &&
Number.isFinite(position.x)
? position.x
: fallback.x;
const y =
typeof position?.y === 'number' &&
Number.isFinite(position.y)
? position.y
: fallback.y;
return {
x: clampedUiAxis(x, left, width),
y: clampedUiAxis(y, top, height)
};
}
function pointerMovedBeyondThreshold(
startX,
startY,
currentX,
currentY
) {
const deltaX = Number(currentX) - Number(startX);
const deltaY = Number(currentY) - Number(startY);
return (
Number.isFinite(deltaX) &&
Number.isFinite(deltaY) &&
deltaX * deltaX + deltaY * deltaY >=
UI_DRAG_THRESHOLD_PX * UI_DRAG_THRESHOLD_PX
);
}
function parseUrl(rawUrl) {
if (typeof rawUrl !== 'string' || !rawUrl) {
return null;
}
try {
const url = new URL(
rawUrl.startsWith('//') ? `https:${rawUrl}` : rawUrl
);
if (url.protocol !== 'http:' && url.protocol !== 'https:') {
return null;
}
return url;
} catch (_) {
return null;
}
}
function hostOf(rawUrl) {
return parseUrl(rawUrl)?.hostname.toLowerCase() || '';
}
function isAkamaiHost(host) {
return String(host || '').toLowerCase().endsWith('.akamaized.net');
}
function isOfficialCdnHost(host) {
const normalized = String(host || '').toLowerCase();
return (
normalized.endsWith('.bilivideo.com') ||
normalized.endsWith('.akamaized.net')
);
}
function isMediaUrl(rawUrl) {
const url = parseUrl(rawUrl);
if (!url || url.pathname.includes('/live-bvc/')) {
return false;
}
const pathAndQuery = `${url.pathname}${url.search}`;
return (
MEDIA_PATH_RE.test(pathAndQuery) ||
url.pathname.startsWith('/upgcxcode/') ||
url.pathname.startsWith('/v1/resource/')
);
}
function isExplicitPcdn(rawUrl) {
const url = parseUrl(rawUrl);
if (!url) {
return false;
}
const host = url.hostname.toLowerCase();
const firstLabel = host.split('.')[0];
const nonDefaultPort =
!!url.port &&
!(
(url.protocol === 'https:' && url.port === '443') ||
(url.protocol === 'http:' && url.port === '80')
);
return (
IPV4_RE.test(host) ||
host.includes('.mcdn.bilivideo.') ||
/^xy(?:\d+x){3}\d+xy\.mcdn\.bilivideo\./i.test(host) ||
PCDN_SUFFIXES.some(suffix => host.endsWith(suffix)) ||
(firstLabel.startsWith('upos-') && firstLabel.includes('302')) ||
host === 'upos-sz-mirror14b.bilivideo.com' ||
nonDefaultPort ||
/(?:^|[?&])os=mcdn(?:&|$)/i.test(url.search)
);
}
function isObservableMediaRequest(rawUrl) {
const host = hostOf(rawUrl);
return !!(
host &&
isMediaUrl(rawUrl) &&
(isOfficialCdnHost(host) || isExplicitPcdn(rawUrl))
);
}
// Replace only the URL authority. Everything after it stays byte-for-
// byte identical, including duplicate parameters, escaping and hdnts.
function safeSwapHost(rawUrl, targetHost) {
const host = String(targetHost || '')
.trim()
.replace(/^https?:\/\//i, '')
.replace(/\/.*$/, '');
if (
!host ||
isAkamaiHost(host) ||
/[\s/?#]/.test(host)
) {
return null;
}
// Conservative signature boundary: even though some current Akamai
// URLs happen to work when moved back to UPOS, do not make that a
// long-term assumption. Akamai-only entries remain untouched.
if (isAkamaiHost(hostOf(rawUrl))) {
return null;
}
const match = String(rawUrl || '').match(
/^(https?:\/\/)([^/?#]+)([\s\S]*)$/i
);
if (!match) {
return null;
}
return `${match[1]}${host}${match[3]}`;
}
function collectOriginals(entry) {
if (!entry || typeof entry !== 'object') {
return [];
}
const values = [
entry.baseUrl,
entry.base_url,
entry.url
];
for (const key of ['backupUrl', 'backup_url', 'backup_url_list']) {
if (Array.isArray(entry[key])) {
values.push(...entry[key]);
}
}
return stableUnique(values).filter(isMediaUrl);
}
function makeCandidate(url, original, originalIndex) {
return {
url,
host: hostOf(url),
original,
synthetic: !original,
originalIndex,
pcdn: isExplicitPcdn(url)
};
}
function buildCandidates(originals, safeHosts = SAFE_GENERIC_HOSTS) {
const candidates = [];
const seenUrls = new Set();
function add(url, original, originalIndex) {
if (
typeof url !== 'string' ||
!isMediaUrl(url) ||
seenUrls.has(url)
) {
return;
}
seenUrls.add(url);
candidates.push(makeCandidate(url, original, originalIndex));
}
originals.forEach((url, index) => add(url, true, index));
const donor = originals.find(url => {
const host = hostOf(url);
return (
host.endsWith('.bilivideo.com') &&
!isExplicitPcdn(url) &&
isMediaUrl(url)
);
});
if (!donor) {
return candidates;
}
for (let index = 0; index < safeHosts.length; index += 1) {
const host = String(safeHosts[index] || '').toLowerCase();
if (
!host ||
isAkamaiHost(host) ||
!host.endsWith('.bilivideo.com')
) {
continue;
}
// Prefer an exact API-provided URL for a host when present.
if (originals.some(url => hostOf(url) === host)) {
continue;
}
const swapped = safeSwapHost(donor, host);
if (swapped && !isExplicitPcdn(swapped)) {
add(swapped, false, originals.length + index);
}
}
return candidates;
}
function healthTtlMs(record) {
return record?.ok ? HEALTH_TTL_MS : FAILED_HEALTH_TTL_MS;
}
function healthExpiryAt(record) {
return record && typeof record.sampledAt === 'number'
? record.sampledAt + healthTtlMs(record)
: 0;
}
function isFreshHealth(record, now = Date.now()) {
return !!(
record &&
typeof record.sampledAt === 'number' &&
record.sampledAt <= now + 60 * 1000 &&
now <= healthExpiryAt(record)
);
}
function verifiedAtOf(record, now = Date.now()) {
const verifiedAt = record?.verifiedAt;
return typeof verifiedAt === 'number' &&
Number.isFinite(verifiedAt) &&
verifiedAt <= now + 60 * 1000
? verifiedAt
: Number(record?.sampledAt) || 0;
}
function needsHealthVerification(record, now = Date.now()) {
return !!(
record?.ok &&
isFreshHealth(record, now) &&
now - verifiedAtOf(record, now) >=
HEALTH_VERIFY_INTERVAL_MS
);
}
function verificationLimitMs(record) {
const baseline = Number(record?.worstMs) || 0;
return Math.min(
PROBE_TIMEOUT_MS,
Math.max(
VERIFY_SLOW_MIN_MS,
baseline * VERIFY_SLOW_FACTOR
)
);
}
function isVerificationAcceptable(sample, record) {
return !!(
sample?.ok &&
Number.isFinite(sample.totalMs) &&
sample.totalMs <= verificationLimitMs(record)
);
}
function coldOrder(candidates, includeSynthetic = true) {
return candidates
.filter(candidate => includeSynthetic || candidate.original)
.slice()
.sort((a, b) => {
if (a.pcdn !== b.pcdn) {
return a.pcdn ? 1 : -1;
}
if (a.synthetic !== b.synthetic) {
return a.synthetic ? 1 : -1;
}
return a.originalIndex - b.originalIndex;
});
}
function successRatio(record) {
if (!record || !(record.attempts > 0)) {
return 0;
}
return (record.successes || 0) / record.attempts;
}
function compareSuccessfulHealth(aRecord, bRecord, a, b) {
const ratioDelta = successRatio(bRecord) - successRatio(aRecord);
if (Math.abs(ratioDelta) > 0.001) {
return ratioDelta;
}
const aWorst = Number.isFinite(aRecord.worstMs)
? aRecord.worstMs
: PROBE_TIMEOUT_MS;
const bWorst = Number.isFinite(bRecord.worstMs)
? bRecord.worstMs
: PROBE_TIMEOUT_MS;
const low = Math.max(1, Math.min(aWorst, bWorst));
const high = Math.max(aWorst, bWorst);
// Within 15%, keep the API/cache order to avoid pointless flapping.
if (high / low <= 1.15) {
return a.originalIndex - b.originalIndex;
}
return aWorst - bWorst;
}
function rankCandidates(candidates, health = {}, now = Date.now()) {
const annotated = candidates.map(candidate => ({
candidate,
record: health[candidate.host],
fresh: isFreshHealth(health[candidate.host], now)
}));
const hasFreshResult = annotated.some(item => item.fresh);
const hasFreshSuccess = annotated.some(
item => item.fresh && item.record?.ok
);
// If every result we have is bad, do not invent a new route: retain
// Bilibili's exact original fallback chain.
if (hasFreshResult && !hasFreshSuccess) {
return coldOrder(candidates, false);
}
if (!hasFreshSuccess) {
return coldOrder(candidates, true);
}
function group(item) {
if (item.candidate.pcdn) {
return 5;
}
if (item.fresh && item.record?.ok) {
return 0;
}
if (!item.fresh && item.candidate.original) {
return 1;
}
if (!item.fresh && item.candidate.synthetic) {
return 2;
}
if (item.fresh && !item.record?.ok && item.candidate.original) {
return 3;
}
return 4;
}
return annotated
.slice()
.sort((a, b) => {
const groupDelta = group(a) - group(b);
if (groupDelta) {
return groupDelta;
}
if (group(a) === 0) {
const healthDelta = compareSuccessfulHealth(
a.record,
b.record,
a.candidate,
b.candidate
);
if (healthDelta) {
return healthDelta;
}
}
return (
a.candidate.originalIndex -
b.candidate.originalIndex
);
})
.map(item => item.candidate);
}
function isNativeSignedAkamai(candidate) {
return !!(
candidate?.original &&
isAkamaiHost(candidate.host) &&
/(?:^|[?&])hdnts=[^&]+/i.test(
parseUrl(candidate.url)?.search || ''
)
);
}
function rankManualCandidates(candidates, manualTarget) {
const cold = coldOrder(candidates, true);
let selected;
if (manualTarget === NATIVE_AKAMAI_ROUTE) {
selected = cold.filter(isNativeSignedAkamai);
} else if (SAFE_GENERIC_HOSTS.includes(manualTarget)) {
selected = cold.filter(
candidate =>
!candidate.pcdn &&
candidate.host === manualTarget
);
} else {
return {
ordered: coldOrder(candidates, false),
matched: false
};
}
if (!selected.length) {
return {
ordered: coldOrder(candidates, false),
matched: false
};
}
const selectedUrls = new Set(
selected.map(candidate => candidate.url)
);
return {
ordered: selected.concat(
cold.filter(
candidate => !selectedUrls.has(candidate.url)
)
),
matched: true
};
}
function sameStringArray(a, b) {
return (
a.length === b.length &&
a.every((value, index) => value === b[index])
);
}
function applyOrdering(entry, orderedCandidates) {
const urls = stableUnique(
orderedCandidates.map(candidate => candidate.url)
);
if (!entry || !urls.length) {
return false;
}
const before = collectOriginals(entry);
const base = urls[0];
const backups = urls.slice(1);
const isDurl =
typeof entry.url === 'string' &&
typeof entry.baseUrl !== 'string' &&
typeof entry.base_url !== 'string';
if (isDurl) {
entry.url = base;
entry.backupUrl = backups.slice();
entry.backup_url = backups.slice();
} else {
entry.baseUrl = base;
entry.base_url = base;
entry.backupUrl = backups.slice();
entry.backup_url = backups.slice();
}
return !sameStringArray(before, collectOriginals(entry));
}
function walkMediaEntries(value, callback, depth = 0, seen = new WeakSet()) {
if (
value == null ||
typeof value !== 'object' ||
depth > 20 ||
seen.has(value)
) {
return;
}
seen.add(value);
const originals = collectOriginals(value);
if (originals.length) {
callback(value, originals);
return;
}
if (Array.isArray(value)) {
for (const item of value) {
walkMediaEntries(item, callback, depth + 1, seen);
}
return;
}
for (const key of Object.keys(value)) {
walkMediaEntries(value[key], callback, depth + 1, seen);
}
}
function planFromCandidates(
candidates,
safeHosts = SAFE_GENERIC_HOSTS,
preferredHost = ''
) {
const byHost = new Map();
for (const candidate of candidates) {
if (
!candidate.host ||
candidate.pcdn ||
!isOfficialCdnHost(candidate.host) ||
(isAkamaiHost(candidate.host) && !candidate.original)
) {
continue;
}
// An Akamai entry reaches this point only when it was present
// verbatim in the API response. safeSwapHost never creates one.
const route = {
host: candidate.host,
url: candidate.url,
original: !!candidate.original,
originalIndex: candidate.originalIndex,
nativeAkamai:
isAkamaiHost(candidate.host) && candidate.original
};
const existing = byHost.get(candidate.host);
if (
!existing ||
(!existing.original && route.original) ||
(existing.original &&
route.original &&
route.originalIndex < existing.originalIndex)
) {
byHost.set(candidate.host, route);
}
}
const originals = [...byHost.values()]
.filter(route => route.original)
.sort((a, b) => a.originalIndex - b.originalIndex);
const selected = [];
const selectedHosts = new Set();
function add(route) {
if (
route &&
!selectedHosts.has(route.host) &&
selected.length < MAX_PROBE_HOSTS
) {
selectedHosts.add(route.host);
selected.push(route);
return true;
}
return false;
}
// Reserve two API-native slots. Prefer one ordinary UPOS donor and
// one native Akamai route when both exist. The actual preferred
// route is a hard reservation even if it was the third API backup.
const preferred = byHost.get(preferredHost);
add(preferred);
const ordinaryOriginal = originals.find(
route => !route.nativeAkamai
);
const nativeAkamai = originals.find(
route => route.nativeAkamai
);
if (preferred?.original) {
add(
preferred.nativeAkamai
? ordinaryOriginal
: nativeAkamai
);
} else {
add(ordinaryOriginal);
add(nativeAkamai);
}
for (const route of originals) {
if (
selected.filter(item => item.original).length >=
MAX_ORIGINAL_PROBE_HOSTS
) {
break;
}
add(route);
}
const presetHosts = stableUnique(
(safeHosts || []).map(host =>
String(host || '').toLowerCase()
)
).slice(0, MAX_PRESET_PROBE_HOSTS);
for (const host of presetHosts) {
add(byHost.get(host));
}
return selected.slice(0, MAX_PROBE_HOSTS);
}
function transformPlayInfo(
payload,
health = {},
now = Date.now(),
options = {}
) {
const result = {
payload,
changed: false,
entryCount: 0,
probePlan: [],
availableHosts: [],
nativeAkamaiAvailable: false,
winnerHost: '',
usedFreshHealth: false,
manualMatched: 0,
manualMissed: 0
};
if (
!payload ||
typeof payload !== 'object' ||
(payload.code !== undefined && payload.code !== 0)
) {
return result;
}
const safeHosts = options.safeHosts || SAFE_GENERIC_HOSTS;
const mode = options.mode === 'manual' ? 'manual' : 'auto';
const manualTarget =
options.manualTarget || DEFAULT_SETTINGS.manualTarget;
walkMediaEntries(payload, (entry, originals) => {
const candidates = buildCandidates(originals, safeHosts);
if (!candidates.length) {
return;
}
result.availableHosts = stableUnique([
...result.availableHosts,
...candidates.map(candidate => candidate.host)
]);
result.nativeAkamaiAvailable =
result.nativeAkamaiAvailable ||
candidates.some(isNativeSignedAkamai);
let ordered;
let manualMatched = false;
if (mode === 'manual') {
const manual = rankManualCandidates(
candidates,
manualTarget
);
ordered = manual.ordered;
manualMatched = manual.matched;
if (manualMatched) {
result.manualMatched += 1;
} else {
result.manualMissed += 1;
}
} else {
ordered = rankCandidates(candidates, health, now);
}
if (!ordered.length) {
return;
}
if (!result.winnerHost) {
result.winnerHost =
mode === 'manual' && !manualMatched
? ''
: ordered[0].host;
result.usedFreshHealth = !!(
mode === 'auto' &&
isFreshHealth(health[ordered[0].host], now) &&
health[ordered[0].host]?.ok
);
}
if (!result.probePlan.length) {
result.probePlan = planFromCandidates(
candidates,
safeHosts,
result.winnerHost
);
}
if (mode !== 'manual' || manualMatched) {
result.changed =
applyOrdering(entry, ordered) || result.changed;
}
result.entryCount += 1;
});
return result;
}
function median(values) {
const sorted = values
.filter(Number.isFinite)
.slice()
.sort((a, b) => a - b);
if (!sorted.length) {
return 0;
}
const middle = Math.floor(sorted.length / 2);
return sorted.length % 2
? sorted[middle]
: (sorted[middle - 1] + sorted[middle]) / 2;
}
function aggregateProbeSamples(host, samples, sampledAt = Date.now()) {
const successful = samples.filter(sample => sample.ok);
return {
host,
// Stability wins over a flashy peak: a host is promoted only
// when both the beginning and a later range complete.
ok:
samples.length > 0 &&
successful.length === samples.length,
attempts: samples.length,
successes: successful.length,
medianMbps: median(successful.map(sample => sample.mbps)),
medianTtfbMs: median(
successful.map(sample => sample.ttfbMs)
),
worstMs: Math.max(
...samples.map(sample =>
sample.ok ? sample.totalMs : PROBE_TIMEOUT_MS
),
PROBE_TIMEOUT_MS * (samples.length ? 0 : 1)
),
sampledAt,
verifiedAt: sampledAt
};
}
function compareHealthRecords(a, b) {
const ratioDelta = successRatio(b) - successRatio(a);
if (Math.abs(ratioDelta) > 0.001) {
return ratioDelta;
}
const worstDelta =
(a.worstMs || PROBE_TIMEOUT_MS) -
(b.worstMs || PROBE_TIMEOUT_MS);
if (worstDelta) {
return worstDelta;
}
return (
(a.medianTtfbMs || PROBE_TIMEOUT_MS) -
(b.medianTtfbMs || PROBE_TIMEOUT_MS)
);
}
function uniqueProbeRoutes(plan) {
const routes = [];
const seenHosts = new Set();
for (const route of plan || []) {
if (
!route?.host ||
!route.url ||
seenHosts.has(route.host)
) {
continue;
}
seenHosts.add(route.host);
routes.push(route);
}
return routes;
}
function planProbeWork(
plan,
health = {},
now = Date.now(),
preferredHost = '',
force = false
) {
const routes = uniqueProbeRoutes(plan);
if (!routes.length) {
return {
kind: 'none',
verifyRoute: null,
routes: []
};
}
if (force) {
return {
kind: 'full',
verifyRoute: null,
routes
};
}
const healthy = routes
.map(route => ({
route,
record: health[route.host]
}))
.filter(
item =>
item.record?.ok &&
isFreshHealth(item.record, now)
)
.sort((a, b) =>
compareHealthRecords(a.record, b.record)
);
const preferred = healthy.find(
item => item.route.host === preferredHost
);
const verifyItem = preferredHost
? preferred || null
: healthy[0] || null;
const verifyRoute =
verifyItem &&
needsHealthVerification(verifyItem.record, now)
? verifyItem.route
: null;
const staleRoutes = routes.filter(route => {
const record = health[route.host];
return !record || !isFreshHealth(record, now);
});
if (!healthy.length) {
if (!staleRoutes.length) {
// Every route is inside the short failed-result cooldown.
return {
kind: 'none',
verifyRoute: null,
routes: []
};
}
return {
kind:
staleRoutes.length === routes.length
? 'full'
: 'adaptive',
verifyRoute: null,
routes: staleRoutes
};
}
if (!verifyRoute && !staleRoutes.length) {
return {
kind: 'none',
verifyRoute: null,
routes: []
};
}
return {
kind: 'adaptive',
verifyRoute,
routes: staleRoutes
};
}
function formatProbeAge(sampledAt, now = Date.now()) {
if (!sampledAt) {
return '';
}
const seconds = Math.max(
0,
Math.floor((now - sampledAt) / 1000)
);
if (seconds < 60) {
return '刚刚';
}
if (seconds < 3600) {
return `${Math.floor(seconds / 60)} 分钟前`;
}
if (seconds < 86400) {
return `${Math.floor(seconds / 3600)} 小时前`;
}
return `${Math.floor(seconds / 86400)} 天前`;
}
function install(root) {
if (
!root ||
root.__BILI_AUTO_CDN_STABLE_INSTALLED__ ||
typeof root.fetch !== 'function' ||
typeof root.XMLHttpRequest !== 'function'
) {
return;
}
const nativeFetch = root.fetch;
const NativeXHR = root.XMLHttpRequest;
const NativeResponse = root.Response;
const NativeHeaders = root.Headers;
const nativeJsonParse = root.JSON.parse.bind(root.JSON);
const nativeJsonStringify = root.JSON.stringify.bind(root.JSON);
const logPrefix = '[BiliAutoCDN]';
const ROUTE_DEFS = Object.freeze([
{
id: 'auto',
label: '自动选择',
short: '自动',
description: ''
},
{
id: 'original',
label: 'B站原始',
short: '原始',
description: '完全不修改播放地址'
},
{
id: SAFE_GENERIC_HOSTS[0],
label: 'Cosov',
short: 'COSOV',
description: '国际 UPOS'
},
{
id: NATIVE_AKAMAI_ROUTE,
label: '原生 Akamai',
short: 'AKAMAI',
description: '仅使用 API 原生签名'
},
{
id: SAFE_GENERIC_HOSTS[1],
label: 'Aliov',
short: 'ALIOV',
description: '阿里 UPOS'
},
{
id: SAFE_GENERIC_HOSTS[2],
label: '香港 EQ',
short: 'HK EQ',
description: '香港 UPOS'
}
]);
const settings = loadSettings();
const state = {
enabled: settings.enabled,
mode: settings.mode,
manualTarget: settings.manualTarget,
autoProbe: settings.autoProbe,
health: loadHealth(),
probePromise: null,
probeGeneration: 0,
activeProbeGeneration: 0,
activeProbeKey: '',
activeProbeForced: false,
pendingProbe: null,
phase: settings.enabled ? 'idle' : 'off',
lastWinner: '',
lastSource: '',
lastProbeAt: 0,
benchmarkWinner: '',
observedHost: '',
currentPlan: [],
availableHosts: [],
nativeAkamaiAvailable: false,
manualMatched: 0,
manualMissed: 0,
probeProgress: null,
probeResourceCounts: new Map(),
phaseNote: ''
};
const ui = {
mounted: false,
open: false,
pendingRoute: '',
host: null,
shadow: null,
refs: {},
routeRefs: new Map(),
position: null,
preferredPosition: null,
drag: null,
ageTimer: null,
suppressLauncherClickUntil: 0
};
root.__BILI_AUTO_CDN_STABLE_INSTALLED__ = true;
function loadSettings() {
try {
const stored = nativeJsonParse(
root.localStorage.getItem(SETTINGS_KEY) || 'null'
);
const legacyEnabled =
root.localStorage.getItem(ENABLED_KEY) !== '0';
return normalizeSettings(stored, legacyEnabled);
} catch (_) {
return { ...DEFAULT_SETTINGS };
}
}
function saveSettings(nextSettings) {
const normalized = normalizeSettings(
nextSettings,
state.enabled
);
const enabledChanged =
state.enabled !== normalized.enabled;
try {
root.localStorage.setItem(
SETTINGS_KEY,
nativeJsonStringify(normalized)
);
} catch (_) {
return false;
}
// Keep the v0.1 switch in sync for users who still call the old
// Console API. Failure here does not invalidate the canonical
// versioned settings object that was already saved.
try {
root.localStorage.setItem(
ENABLED_KEY,
normalized.enabled ? '1' : '0'
);
} catch (_) {}
state.enabled = normalized.enabled;
state.mode = normalized.mode;
state.manualTarget = normalized.manualTarget;
state.autoProbe = normalized.autoProbe;
if (enabledChanged) {
state.phase = normalized.enabled ? 'idle' : 'off';
}
renderUi();
return true;
}
function viewportSize() {
const documentElement =
root.document?.documentElement;
const visual = root.visualViewport;
return {
width:
Number(visual?.width) ||
Number(root.innerWidth) ||
Number(documentElement?.clientWidth) ||
1024,
height:
Number(visual?.height) ||
Number(root.innerHeight) ||
Number(documentElement?.clientHeight) ||
768,
left: Number(visual?.offsetLeft) || 0,
top: Number(visual?.offsetTop) || 0
};
}
function loadUiPosition() {
const viewport = viewportSize();
try {
return clampUiPosition(
nativeJsonParse(
root.localStorage.getItem(
UI_POSITION_KEY
) || 'null'
),
viewport.width,
viewport.height,
viewport.left,
viewport.top
);
} catch (_) {
return defaultUiPosition(
viewport.width,
viewport.height,
viewport.left,
viewport.top
);
}
}
function saveUiPosition(position) {
try {
root.localStorage.setItem(
UI_POSITION_KEY,
nativeJsonStringify(position)
);
} catch (_) {
// Position persistence is optional in private contexts.
}
}
function applyUiPosition(position, persist = false) {
const viewport = viewportSize();
const next = clampUiPosition(
position,
viewport.width,
viewport.height,
viewport.left,
viewport.top
);
ui.position = next;
if (ui.host) {
ui.host.style.left = `${next.x}px`;
ui.host.style.top = `${next.y}px`;
ui.host.style.right = 'auto';
ui.host.style.bottom = 'auto';
}
if (persist) {
ui.preferredPosition = next;
saveUiPosition(next);
}
if (ui.open) {
positionPanel();
}
return next;
}
function positionPanel() {
if (
!ui.mounted ||
!ui.open ||
ui.refs.panel?.hidden
) {
return;
}
const viewport = viewportSize();
const launcherRect =
ui.refs.launcher.getBoundingClientRect();
const hostRect = ui.host.getBoundingClientRect();
const panel = ui.refs.panel;
const margin = 12;
const gap = 6;
panel.style.left = '0px';
panel.style.top = `${
launcherRect.height + gap
}px`;
panel.style.right = 'auto';
panel.style.bottom = 'auto';
panel.style.width = `${Math.max(
1,
Math.min(370, viewport.width - margin * 2)
)}px`;
panel.style.maxHeight = `${Math.min(
650,
Math.max(48, viewport.height - margin * 2)
)}px`;
const initialRect = panel.getBoundingClientRect();
const panelWidth = initialRect.width;
const spaceAbove = Math.max(
0,
launcherRect.top -
gap -
viewport.top -
margin
);
const spaceBelow = Math.max(
0,
viewport.top +
viewport.height -
launcherRect.bottom -
gap -
margin
);
const placeAbove = spaceAbove > spaceBelow;
const availableHeight = placeAbove
? spaceAbove
: spaceBelow;
panel.style.maxHeight = `${Math.min(
650,
Math.max(48, availableHeight)
)}px`;
const measuredRect = panel.getBoundingClientRect();
const panelHeight =
measuredRect.height ||
Math.min(650, Math.max(48, availableHeight));
const preferredLeft =
launcherRect.left + launcherRect.width / 2 <=
viewport.left + viewport.width / 2
? launcherRect.left
: launcherRect.right - panelWidth;
const minLeft = viewport.left + margin;
const maxLeft = Math.max(
minLeft,
viewport.left +
viewport.width -
panelWidth -
margin
);
const left = Math.min(
maxLeft,
Math.max(minLeft, preferredLeft)
);
const preferredTop = placeAbove
? launcherRect.top - gap - panelHeight
: launcherRect.bottom + gap;
const minTop = viewport.top + margin;
const maxTop = Math.max(
minTop,
viewport.top +
viewport.height -
panelHeight -
margin
);
const top = Math.min(
maxTop,
Math.max(minTop, preferredTop)
);
panel.style.left = `${Math.round(
left - hostRect.left
)}px`;
panel.style.top = `${Math.round(
top - hostRect.top
)}px`;
panel.style.transformOrigin = `${
launcherRect.left + launcherRect.width / 2 <=
left + panelWidth / 2
? 'left'
: 'right'
} ${placeAbove ? 'bottom' : 'top'}`;
}
function beginLauncherDrag(event) {
if (
event.isPrimary === false ||
(typeof event.button === 'number' &&
event.button !== 0)
) {
return;
}
const rect = ui.host.getBoundingClientRect();
ui.drag = {
pointerId: event.pointerId,
startClientX: event.clientX,
startClientY: event.clientY,
startLeft: rect.left,
startTop: rect.top,
moved: false
};
ui.refs.launcher.classList.add(
'launcher--dragging'
);
try {
ui.refs.launcher.setPointerCapture(
event.pointerId
);
} catch (_) {}
}
function moveLauncherDrag(event) {
const drag = ui.drag;
if (!drag || event.pointerId !== drag.pointerId) {
return;
}
if (
!drag.moved &&
pointerMovedBeyondThreshold(
drag.startClientX,
drag.startClientY,
event.clientX,
event.clientY
)
) {
drag.moved = true;
}
if (!drag.moved) {
return;
}
event.preventDefault();
applyUiPosition({
x:
drag.startLeft +
event.clientX -
drag.startClientX,
y:
drag.startTop +
event.clientY -
drag.startClientY
});
}
function endLauncherDrag(event, cancelled = false) {
const drag = ui.drag;
if (!drag || event.pointerId !== drag.pointerId) {
return;
}
if (
!cancelled &&
!drag.moved &&
pointerMovedBeyondThreshold(
drag.startClientX,
drag.startClientY,
event.clientX,
event.clientY
)
) {
drag.moved = true;
}
if (drag.moved && !cancelled) {
applyUiPosition({
x:
drag.startLeft +
event.clientX -
drag.startClientX,
y:
drag.startTop +
event.clientY -
drag.startClientY
});
} else if (drag.moved) {
applyUiPosition({
x: drag.startLeft,
y: drag.startTop
});
}
ui.drag = null;
ui.refs.launcher.classList.remove(
'launcher--dragging'
);
try {
ui.refs.launcher.releasePointerCapture(
event.pointerId
);
} catch (_) {}
if (!drag.moved) {
return;
}
if (!cancelled) {
event.preventDefault();
applyUiPosition(ui.position, true);
ui.suppressLauncherClickUntil =
Date.now() + 500;
}
}
function handleLauncherClick(event) {
if (
event.detail !== 0 &&
Date.now() <
ui.suppressLauncherClickUntil
) {
event.preventDefault();
event.stopPropagation();
return;
}
setUiOpen(!ui.open);
}
function log(...args) {
root.console.info(logPrefix, ...args);
}
function loadHealth() {
try {
const parsed = nativeJsonParse(
root.localStorage.getItem(CACHE_KEY) || 'null'
);
if (
!parsed ||
parsed.version !== CACHE_VERSION ||
!parsed.health ||
typeof parsed.health !== 'object'
) {
return {};
}
const clean = {};
for (const [host, record] of Object.entries(parsed.health)) {
if (
typeof host === 'string' &&
record &&
typeof record.sampledAt === 'number'
) {
clean[host] = {
host,
ok: !!record.ok,
attempts: Number(record.attempts) || 0,
successes: Number(record.successes) || 0,
medianMbps:
Number(record.medianMbps) || 0,
medianTtfbMs:
Number(record.medianTtfbMs) || 0,
worstMs:
Number(record.worstMs) ||
PROBE_TIMEOUT_MS,
sampledAt: record.sampledAt,
verifiedAt:
typeof record.verifiedAt ===
'number' &&
Number.isFinite(record.verifiedAt)
? record.verifiedAt
: record.sampledAt
};
}
}
return clean;
} catch (_) {
return {};
}
}
function saveHealth() {
const sanitized = {};
for (const [host, record] of Object.entries(state.health)) {
sanitized[host] = {
host,
ok: !!record.ok,
attempts: record.attempts,
successes: record.successes,
medianMbps: Number(
(record.medianMbps || 0).toFixed(3)
),
medianTtfbMs: Number(
(record.medianTtfbMs || 0).toFixed(1)
),
worstMs: Number((record.worstMs || 0).toFixed(1)),
sampledAt: record.sampledAt,
verifiedAt: verifiedAtOf(record)
};
}
try {
root.localStorage.setItem(
CACHE_KEY,
nativeJsonStringify({
version: CACHE_VERSION,
health: sanitized
})
);
} catch (_) {
// A private/incognito context may reject localStorage.
}
}
function requestUrlOf(input) {
if (typeof input === 'string') {
return input;
}
if (input && typeof input.href === 'string') {
return input.href;
}
if (input && typeof input.url === 'string') {
return input.url;
}
return '';
}
function isPlayUrlApi(rawUrl) {
try {
const url = new URL(rawUrl, root.location.href);
return (
url.hostname === 'api.bilibili.com' &&
PLAYURL_PATHS.has(url.pathname)
);
} catch (_) {
return false;
}
}
function bestHealthyHost(hosts = []) {
const allowed = new Set(hosts.filter(Boolean));
const records = Object.values(state.health)
.filter(
record =>
record.ok &&
isFreshHealth(record) &&
(!allowed.size || allowed.has(record.host))
)
.sort(compareHealthRecords);
return records[0]?.host || '';
}
function routeDefinition(id) {
return ROUTE_DEFS.find(route => route.id === id);
}
function routeForHost(host) {
if (!host) {
return null;
}
const exact = ROUTE_DEFS.find(route => route.id === host);
if (exact) {
return exact;
}
if (isAkamaiHost(host)) {
return routeDefinition(NATIVE_AKAMAI_ROUTE);
}
return null;
}
function displayHost(host, emptyText = '尚未观测') {
if (!host) {
return emptyText;
}
return routeForHost(host)?.label || host;
}
function currentRouteId() {
if (!state.enabled) {
return 'original';
}
return state.mode === 'manual'
? state.manualTarget
: 'auto';
}
function availabilityForRoute(route) {
if (route.id === 'auto' || route.id === 'original') {
return { available: true, reason: '' };
}
if (
!state.enabled &&
SAFE_GENERIC_HOSTS.includes(route.id)
) {
return { available: true, reason: '' };
}
if (route.id === NATIVE_AKAMAI_ROUTE) {
return state.nativeAkamaiAvailable
? { available: true, reason: '' }
: {
available: false,
reason: state.currentPlan.length
? '本视频没有原生签名 Akamai'
: '打开视频后检测可用性'
};
}
return state.availableHosts.includes(route.id)
? { available: true, reason: '' }
: {
available: false,
reason: state.currentPlan.length
? '本视频无法安全生成该线路'
: '打开视频后检测可用性'
};
}
function healthForRoute(route) {
if (route.id === NATIVE_AKAMAI_ROUTE) {
const native = state.currentPlan.find(
item => item.nativeAkamai
);
return native ? state.health[native.host] : null;
}
return state.health[route.id] || null;
}
function setUiOpen(next, restoreFocus = false) {
ui.open = !!next;
if (!ui.mounted) {
return;
}
ui.refs.panel.hidden = !ui.open;
ui.refs.launcher.setAttribute(
'aria-expanded',
ui.open ? 'true' : 'false'
);
ui.refs.launcher.setAttribute(
'aria-label',
ui.open
? '收起视频线路控制面板'
: '打开视频线路控制面板'
);
ui.refs.launcher.title = ui.open
? '拖动移动；点击收起线路面板'
: '拖动移动；点击打开线路面板';
if (ui.open) {
renderUi();
positionPanel();
}
if (!ui.open && restoreFocus) {
ui.refs.launcher.focus();
}
}
function announce(message) {
if (ui.mounted) {
ui.refs.live.textContent = '';
root.setTimeout(() => {
if (ui.mounted) {
ui.refs.live.textContent = message;
}
}, 10);
}
}
function addBadge(container, text, kind = '') {
const badge = root.document.createElement('span');
badge.className = `badge${kind ? ` badge--${kind}` : ''}`;
badge.textContent = text;
container.appendChild(badge);
}
function buildRouteRows() {
for (const route of ROUTE_DEFS) {
const label = root.document.createElement('label');
label.className = 'route';
label.dataset.route = route.id;
const radio = root.document.createElement('input');
radio.type = 'radio';
radio.name = 'kota-cdn-route';
radio.value = route.id;
const marker = root.document.createElement('span');
marker.className = 'route__marker';
marker.setAttribute('aria-hidden', 'true');
const body = root.document.createElement('span');
body.className = 'route__body';
const top = root.document.createElement('span');
top.className = 'route__top';
const name = root.document.createElement('strong');
name.className = 'route__name';
name.textContent = route.label;
const metrics = root.document.createElement('span');
metrics.className = 'route__metrics';
top.append(name, metrics);
const bottom = root.document.createElement('span');
bottom.className = 'route__bottom';
const meta = root.document.createElement('span');
meta.className = 'route__meta';
const badges = root.document.createElement('span');
badges.className = 'route__badges';
bottom.append(meta, badges);
body.append(top, bottom);
label.append(radio, marker, body);
ui.refs.routeList.appendChild(label);
radio.addEventListener('change', () => {
if (!radio.checked) {
return;
}
ui.pendingRoute = route.id;
renderUi();
});
ui.routeRefs.set(route.id, {
label,
radio,
metrics,
meta,
badges
});
}
}
function pendingDescription(routeId) {
const route = routeDefinition(routeId);
if (!route) {
return '';
}
if (routeId === 'original') {
return '将停用脚本，B站播放地址保持原样。';
}
if (routeId === 'auto') {
return '将改为自动选择；刷新后生效。';
}
return `将优先使用 ${route.label}；其他原生线路仍作为回退。`;
}
function saveRouteAndReload(routeId) {
const next = {
version: DEFAULT_SETTINGS.version,
enabled: routeId !== 'original',
mode:
routeId === 'auto' || routeId === 'original'
? 'auto'
: 'manual',
manualTarget:
routeId === 'auto' || routeId === 'original'
? state.manualTarget
: routeId,
autoProbe: state.autoProbe
};
if (!saveSettings(next)) {
showSettingsError(
'设置保存失败；本页没有切换线路'
);
return false;
}
ui.pendingRoute = '';
renderUi();
root.setTimeout(() => root.location.reload(), 80);
return true;
}
function showSettingsError(message) {
state.phase = 'error';
state.phaseNote = message;
renderUi();
announce(message);
}
function clearCurrentHealthAndRetest() {
if (
state.probePromise ||
!state.enabled ||
!state.currentPlan.length
) {
return;
}
for (const route of state.currentPlan) {
delete state.health[route.host];
}
state.benchmarkWinner = '';
state.phaseNote = '';
saveHealth();
scheduleProbe(
state.currentPlan,
true,
state.lastWinner
);
}
function stopAutomaticProbe() {
const forcedProbeIsCurrent =
state.activeProbeForced &&
isCurrentProbe(state.activeProbeGeneration);
if (
state.probePromise &&
!forcedProbeIsCurrent
) {
state.probeGeneration += 1;
}
if (
state.pendingProbe &&
!state.pendingProbe.force
) {
state.pendingProbe = null;
}
if (!state.probePromise || !forcedProbeIsCurrent) {
state.probeProgress = null;
state.phase = !state.enabled
? 'off'
: state.benchmarkWinner
? 'ready'
: 'idle';
state.phaseNote = state.enabled
? '自动测速已关闭'
: '';
}
renderUi();
}
function setAutoProbeEnabled(next) {
const wanted = !!next;
if (
!saveSettings({
enabled: state.enabled,
mode: state.mode,
manualTarget: state.manualTarget,
autoProbe: wanted
})
) {
showSettingsError(
'设置保存失败；自动测速状态没有改变'
);
return false;
}
if (!wanted) {
stopAutomaticProbe();
announce('自动测速已关闭');
return true;
}
state.phaseNote = '';
if (!state.probePromise) {
state.phase = state.benchmarkWinner
? 'ready'
: 'idle';
}
scheduleProbe(
state.currentPlan,
false,
state.lastWinner
);
renderUi();
announce('自动测速已开启');
return true;
}
function phaseText() {
if (state.phase === 'error') {
return state.phaseNote || '设置保存失败';
}
if (!state.enabled) {
return '脚本停用；播放地址保持原样';
}
if (state.phase === 'waiting') {
return '等待暂停播放，或至少 15 秒缓冲';
}
if (state.phase === 'probing') {
const progress = state.probeProgress;
if (progress) {
return `正在测试 ${displayHost(
progress.host,
progress.host
)} · ${
progress.verification
? '轻量复核'
: `第 ${progress.rangeIndex}/${
progress.rangeTotal || 2
} 段`
}`;
}
return '正在串行测试线路';
}
if (state.phase === 'ready') {
return state.benchmarkWinner
? `测速完成 · ${displayHost(
state.benchmarkWinner,
state.benchmarkWinner
)} 最稳`
: '测速缓存可用';
}
if (state.phase === 'failed') {
return '线路测速失败；继续使用 B站原始回退';
}
return (
state.phaseNote ||
(state.currentPlan.length
? '可以重新测速'
: '等待视频播放地址')
);
}
function renderUi() {
if (!ui.mounted) {
return;
}
const selected = ui.pendingRoute || currentRouteId();
ui.refs.launcher.dataset.phase =
state.phase === 'error'
? 'error'
: state.enabled
? state.phase
: 'off';
for (const route of ROUTE_DEFS) {
const refs = ui.routeRefs.get(route.id);
const availability = availabilityForRoute(route);
const record = healthForRoute(route);
refs.radio.disabled = !availability.available;
refs.radio.checked = selected === route.id;
refs.label.classList.toggle(
'route--disabled',
!availability.available
);
if (route.id === 'auto' || route.id === 'original') {
refs.metrics.textContent = route.description;
} else if (record) {
const age = formatProbeAge(record.sampledAt);
const ageSuffix = age ? ` · ${age}` : '';
refs.metrics.textContent = record.ok
? `${record.medianMbps.toFixed(
1
)} Mbps · TTFB ${record.medianTtfbMs.toFixed(
0
)} ms${ageSuffix}`
: `${record.successes}/${record.attempts} · 测试失败${ageSuffix}`;
} else {
refs.metrics.textContent = '未测试';
}
if (!availability.available) {
refs.meta.textContent = availability.reason;
} else if (
route.id === 'auto' ||
route.id === 'original'
) {
refs.meta.textContent = '';
} else {
refs.meta.textContent =
route.id === NATIVE_AKAMAI_ROUTE
? state.currentPlan.find(
item => item.nativeAkamai
)?.host || route.description
: route.id;
}
refs.meta.title = refs.meta.textContent;
refs.badges.replaceChildren();
if (route.id === currentRouteId()) {
addBadge(refs.badges, '当前', 'current');
}
}
ui.refs.pending.hidden = !ui.pendingRoute;
ui.refs.pendingText.textContent = ui.pendingRoute
? pendingDescription(ui.pendingRoute)
: '';
ui.refs.apply.disabled = !ui.pendingRoute;
ui.refs.phase.textContent = phaseText();
ui.refs.phaseWrap.setAttribute(
'aria-busy',
state.phase === 'waiting' ||
state.phase === 'probing'
? 'true'
: 'false'
);
ui.refs.autoProbe.checked = state.autoProbe;
ui.refs.autoProbe.disabled = !state.enabled;
ui.refs.retest.disabled =
!!state.probePromise ||
!state.enabled ||
!state.currentPlan.length;
ui.refs.retest.textContent =
state.phase === 'probing'
? '测速进行中'
: state.phase === 'waiting'
? '等待安全窗口'
: '重新测速';
}
function mountControlUi() {
if (
ui.mounted ||
!root.document?.documentElement ||
typeof root.document.createElement !== 'function'
) {
return;
}
const host = root.document.createElement('div');
host.id = 'kota-bili-auto-cdn-control';
Object.assign(host.style, {
all: 'initial',
position: 'fixed',
right: '18px',
bottom: '72px',
width: `${UI_LAUNCHER_SIZE}px`,
height: `${UI_LAUNCHER_SIZE}px`,
zIndex: '2147483647',
pointerEvents: 'none'
});
const shadow = host.attachShadow({ mode: 'open' });
shadow.innerHTML = `
<style>
:host {
color-scheme: dark;
--cyan: #00aeec;
--cyan-soft: rgba(0, 174, 236, .16);
--ink: rgba(18, 21, 27, .97);
--line: rgba(255, 255, 255, .12);
--muted: #929aa8;
--text: #f2f5f8;
--amber: #f2b84b;
--red: #ff6b70;
font-family: -apple-system, BlinkMacSystemFont,
"PingFang SC", "Segoe UI", sans-serif;
font-size: 13px;
line-height: 1.4;
}
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
button, input { font: inherit; }
button { -webkit-tap-highlight-color: transparent; }
button:focus-visible, input:focus-visible + .route__marker {
outline: 2px solid var(--cyan);
outline-offset: 2px;
}
.launcher {
width: 30px;
height: 30px;
min-height: 0;
display: grid;
place-items: center;
margin-left: auto;
padding: 0;
border: 0;
border-radius: 50%;
color: #fff;
background: transparent;
box-shadow: none;
cursor: grab;
pointer-events: auto;
touch-action: none;
user-select: none;
-webkit-user-select: none;
}
.launcher--dragging {
cursor: grabbing;
}
.launcher__dot {
width: 16px;
height: 16px;
display: grid;
place-items: center;
border-radius: 50%;
border: 1px solid rgba(255, 255, 255, .7);
background: rgba(0, 174, 236, .68);
box-shadow:
0 0 0 1px rgba(6, 16, 24, .55),
0 3px 11px rgba(0, 0, 0, .3);
transition:
width 140ms ease,
height 140ms ease,
filter 140ms ease,
background 140ms ease;
}
.launcher:hover .launcher__dot,
.launcher:focus-visible .launcher__dot,
.launcher[aria-expanded="true"] .launcher__dot {
width: 20px;
height: 20px;
filter: brightness(1.15);
}
.launcher__bolt {
width: 8px;
height: 11px;
fill: currentColor;
opacity: .94;
pointer-events: none;
}
.launcher[data-phase="waiting"] .launcher__dot {
background: rgba(242, 184, 75, .72);
}
.launcher[data-phase="probing"] .launcher__dot {
animation: pulse 1.1s ease-in-out infinite;
}
.launcher[data-phase="failed"] .launcher__dot,
.launcher[data-phase="error"] .launcher__dot {
background: rgba(255, 107, 112, .72);
}
.launcher[data-phase="off"] .launcher__dot {
background: rgba(115, 123, 136, .62);
}
.panel {
position: absolute;
left: 0;
top: 36px;
width: min(370px, calc(100vw - 24px));
max-height: min(650px, 76vh);
overflow: auto;
border: 1px solid rgba(255, 255, 255, .15);
border-radius: 14px;
color: var(--text);
background: var(--ink);
box-shadow:
0 22px 70px rgba(0, 0, 0, .44),
inset 0 1px rgba(255, 255, 255, .04);
backdrop-filter: blur(18px);
pointer-events: auto;
scrollbar-width: thin;
scrollbar-color: #4b5360 transparent;
transform-origin: right bottom;
animation: panel-in 140ms ease-out;
}
.instrument {
display: flex;
justify-content: space-between;
padding: 10px 14px 6px;
color: #697383;
font: 600 9px/1.2 "SFMono-Regular", Consolas,
monospace;
letter-spacing: .15em;
}
.panel__head {
display: flex;
align-items: center;
gap: 10px;
padding: 5px 14px 12px;
border-bottom: 1px solid var(--line);
}
.title { min-width: 0; flex: 1; }
.title h2 {
margin: 0;
font-size: 18px;
line-height: 1.25;
letter-spacing: -.02em;
}
.auto-probe {
display: inline-flex;
align-items: center;
flex: 0 0 auto;
gap: 6px;
min-height: 28px;
color: #aab1bc;
cursor: pointer;
font-size: 10px;
white-space: nowrap;
}
.auto-probe:has(input:disabled) {
cursor: not-allowed;
opacity: .45;
}
.auto-probe input {
position: absolute;
width: 1px;
height: 1px;
opacity: 0;
pointer-events: none;
}
.auto-probe input:focus-visible +
.auto-probe__track {
outline: 2px solid var(--cyan);
outline-offset: 2px;
}
.auto-probe__track {
width: 28px;
height: 16px;
padding: 2px;
border: 1px solid rgba(255, 255, 255, .16);
border-radius: 999px;
background: #303641;
transition: background 120ms ease;
}
.auto-probe__knob {
display: block;
width: 10px;
height: 10px;
border-radius: 50%;
background: #a5acb7;
transition: transform 120ms ease,
background 120ms ease;
}
.auto-probe input:checked + .auto-probe__track {
border-color: rgba(0, 174, 236, .55);
background: var(--cyan-soft);
}
.auto-probe input:checked +
.auto-probe__track .auto-probe__knob {
transform: translateX(12px);
background: var(--cyan);
}
.close {
width: 28px;
height: 28px;
border: 0;
border-radius: 7px;
color: #8c95a2;
background: transparent;
cursor: pointer;
font-size: 20px;
line-height: 1;
}
.close:hover { color: #fff; background: #2b3039; }
.section-label {
display: flex;
justify-content: space-between;
margin: 11px 14px 6px;
color: #737d8b;
font: 650 9px/1.3 "SFMono-Regular", Consolas,
monospace;
letter-spacing: .12em;
text-transform: uppercase;
}
.route-list { padding: 0 8px; }
.route {
position: relative;
display: flex;
align-items: flex-start;
gap: 10px;
min-height: 54px;
padding: 8px 7px;
border-radius: 9px;
cursor: pointer;
}
.route:hover { background: rgba(255, 255, 255, .045); }
.route:has(input:checked) {
background: rgba(0, 174, 236, .075);
}
.route--disabled {
cursor: not-allowed;
opacity: .48;
}
.route input {
position: absolute;
width: 1px;
height: 1px;
opacity: 0;
}
.route__marker {
flex: 0 0 auto;
width: 15px;
height: 15px;
margin-top: 2px;
border: 1px solid #5d6673;
border-radius: 50%;
}
.route input:checked + .route__marker {
border: 4px solid var(--cyan);
background: #fff;
}
.route__body {
display: block;
min-width: 0;
flex: 1;
}
.route__top, .route__bottom {
display: flex;
align-items: baseline;
justify-content: space-between;
gap: 8px;
}
.route__name {
color: #edf1f5;
font-size: 12px;
font-weight: 650;
}
.route__metrics {
color: #a8b0bc;
font: 10px/1.35 "SFMono-Regular", Consolas,
monospace;
font-variant-numeric: tabular-nums;
text-align: right;
}
.route__bottom { margin-top: 3px; }
.route__meta {
min-width: 0;
overflow: hidden;
color: #666f7d;
font: 9px/1.35 "SFMono-Regular", Consolas,
monospace;
text-overflow: ellipsis;
white-space: nowrap;
}
.route__badges {
display: inline-flex;
flex: 0 0 auto;
gap: 4px;
}
.badge {
padding: 1px 4px;
border: 1px solid #424a56;
border-radius: 4px;
color: #89929f;
font: 600 8px/1.35 "SFMono-Regular", Consolas,
monospace;
}
.badge--current {
border-color: rgba(0, 174, 236, .35);
color: #52c8f2;
}
.pending {
margin: 8px 14px 4px;
padding: 10px;
border: 1px solid rgba(0, 174, 236, .28);
border-radius: 9px;
background: rgba(0, 174, 236, .07);
}
.pending p {
margin: 0 0 9px;
color: #c4d4dc;
font-size: 11px;
}
.pending__actions {
display: flex;
justify-content: flex-end;
gap: 7px;
}
.button {
min-height: 29px;
padding: 5px 10px;
border: 1px solid #414956;
border-radius: 7px;
color: #cbd2db;
background: #272c34;
cursor: pointer;
font-size: 11px;
font-weight: 620;
}
.button:hover:not(:disabled) {
border-color: #626c7a;
background: #303640;
}
.button--primary {
border-color: var(--cyan);
color: #06151c;
background: var(--cyan);
}
.button--primary:hover:not(:disabled) {
border-color: #39c5f5;
background: #39c5f5;
}
.button:disabled {
cursor: not-allowed;
opacity: .45;
}
.footer {
display: flex;
align-items: center;
gap: 10px;
margin-top: 10px;
padding: 11px 14px 13px;
border-top: 1px solid var(--line);
}
.footer__status { min-width: 0; flex: 1; }
.footer__phase {
margin: 0;
color: #b2bac5;
font-size: 10px;
}
.sr-only {
position: absolute;
width: 1px;
height: 1px;
padding: 0;
margin: -1px;
overflow: hidden;
clip: rect(0, 0, 0, 0);
white-space: nowrap;
border: 0;
}
@keyframes panel-in {
from { opacity: 0; transform: translateY(5px); }
to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
50% { opacity: .4; transform: scale(.75); }
}
@media (prefers-reduced-motion: reduce) {
*, *::before, *::after {
animation-duration: .01ms !important;
transition-duration: .01ms !important;
}
}
@media (max-width: 520px) {
.panel {
width: calc(100vw - 24px);
}
}
</style>
<section class="panel" id="kota-cdn-panel"
data-ref="panel" role="dialog"
aria-labelledby="kota-cdn-title" hidden>
<div class="instrument">
<span>Bilibili Accelerator</span>
<span>V${VERSION}</span>
</div>
<header class="panel__head">
<div class="title">
<h2 id="kota-cdn-title">
切换B站视频线路
</h2>
</div>
<button class="close" data-ref="close"
type="button" aria-label="收起面板">×</button>
</header>
<div class="section-label">
<span>ROUTING MODE</span><span>刷新后生效</span>
</div>
<div class="route-list" data-ref="routeList"
role="radiogroup" aria-label="视频 CDN 线路"></div>
<div class="pending" data-ref="pending" hidden>
<p data-ref="pendingText"></p>
<div class="pending__actions">
<button class="button" data-ref="cancel"
type="button">取消</button>
<button class="button button--primary"
data-ref="apply" type="button">
刷新并应用
</button>
</div>
</div>
<footer class="footer">
<div class="footer__status" data-ref="phaseWrap">
<p class="footer__phase"
data-ref="phase"></p>
</div>
<label class="auto-probe">
<span>自动测速</span>
<input data-ref="autoProbe" type="checkbox"
aria-label="自动后台测速">
<span class="auto-probe__track">
<span class="auto-probe__knob"></span>
</span>
</label>
<button class="button" data-ref="retest"
type="button">重新测速</button>
</footer>
</section>
<button class="launcher" data-ref="launcher" type="button"
aria-label="打开视频线路控制面板"
title="拖动移动；点击打开线路面板"
aria-expanded="false" aria-controls="kota-cdn-panel">
<span class="launcher__dot" aria-hidden="true">
<svg class="launcher__bolt" viewBox="0 0 12 16"
focusable="false">
<path d="M5.65 0h5.6l-3.5 6h3.5l-8.8 10
2.5-7h-3.7z"/>
</svg>
</span>
</button>
<div class="sr-only" data-ref="live"
aria-live="polite"></div>
`;
ui.host = host;
ui.shadow = shadow;
ui.refs = Object.fromEntries(
[...shadow.querySelectorAll('[data-ref]')].map(element => [
element.dataset.ref,
element
])
);
ui.mounted = true;
buildRouteRows();
ui.preferredPosition = loadUiPosition();
applyUiPosition(ui.preferredPosition);
ui.refs.launcher.addEventListener(
'pointerdown',
beginLauncherDrag
);
ui.refs.launcher.addEventListener(
'pointermove',
moveLauncherDrag
);
ui.refs.launcher.addEventListener(
'pointerup',
event => endLauncherDrag(event)
);
ui.refs.launcher.addEventListener(
'pointercancel',
event => endLauncherDrag(event, true)
);
ui.refs.launcher.addEventListener(
'lostpointercapture',
event => endLauncherDrag(event, true)
);
ui.refs.launcher.addEventListener(
'click',
handleLauncherClick
);
ui.refs.close.addEventListener('click', () =>
setUiOpen(false, true)
);
ui.refs.cancel.addEventListener('click', () => {
ui.pendingRoute = '';
renderUi();
});
ui.refs.apply.addEventListener('click', () => {
if (ui.pendingRoute) {
saveRouteAndReload(ui.pendingRoute);
}
});
ui.refs.retest.addEventListener(
'click',
clearCurrentHealthAndRetest
);
ui.refs.autoProbe.addEventListener('change', () =>
setAutoProbeEnabled(ui.refs.autoProbe.checked)
);
root.document.addEventListener('keydown', event => {
if (event.key === 'Escape' && ui.open) {
setUiOpen(false, true);
}
});
root.document.addEventListener(
'fullscreenchange',
moveUiForFullscreen
);
root.addEventListener('resize', () =>
applyUiPosition(
ui.preferredPosition || ui.position
)
);
root.addEventListener('orientationchange', () =>
applyUiPosition(
ui.preferredPosition || ui.position
)
);
root.visualViewport?.addEventListener?.(
'resize',
() =>
applyUiPosition(
ui.preferredPosition || ui.position
)
);
root.visualViewport?.addEventListener?.(
'scroll',
() =>
applyUiPosition(
ui.preferredPosition || ui.position
)
);
root.document.documentElement.appendChild(host);
renderUi();
if (
!ui.ageTimer &&
typeof root.setInterval === 'function'
) {
ui.ageTimer = root.setInterval(() => {
if (ui.open) {
renderUi();
}
}, 60 * 1000);
}
}
function moveUiForFullscreen() {
if (!ui.host || !root.document?.documentElement) {
return;
}
if (ui.drag) {
const drag = ui.drag;
ui.drag = null;
ui.refs.launcher.classList.remove(
'launcher--dragging'
);
try {
ui.refs.launcher.releasePointerCapture(
drag.pointerId
);
} catch (_) {}
if (drag.moved) {
ui.preferredPosition = ui.position;
saveUiPosition(ui.position);
ui.suppressLauncherClickUntil =
Date.now() + 500;
}
}
const fullscreen = root.document.fullscreenElement;
const target =
fullscreen &&
String(fullscreen.tagName || '').toLowerCase() !==
'video'
? fullscreen
: root.document.documentElement;
if (ui.host.parentNode !== target) {
target.appendChild(ui.host);
}
applyUiPosition(
ui.preferredPosition || ui.position
);
}
function mountControlUiSoon() {
if (root.document?.documentElement) {
mountControlUi();
} else {
root.addEventListener(
'DOMContentLoaded',
mountControlUi,
{ once: true }
);
}
}
function observeMediaRequest(rawUrl, fromResourceObserver = false) {
if (!isObservableMediaRequest(rawUrl)) {
return;
}
if (
fromResourceObserver &&
state.probeResourceCounts.has(rawUrl)
) {
return;
}
const host = hostOf(rawUrl);
if (!host || host === state.observedHost) {
return;
}
state.observedHost = host;
renderUi();
}
function startResourceObserver() {
if (typeof root.PerformanceObserver !== 'function') {
return;
}
try {
const observer = new root.PerformanceObserver(list => {
for (const entry of list.getEntries()) {
observeMediaRequest(entry.name, true);
}
});
observer.observe({ type: 'resource', buffered: true });
} catch (_) {
// Fetch/XHR observation still covers normal player traffic.
}
}
function processPayloadObject(payload, source) {
if (!state.enabled || !payload || typeof payload !== 'object') {
return {
payload,
changed: false,
entryCount: 0,
probePlan: [],
availableHosts: [],
nativeAkamaiAvailable: false
};
}
const result = transformPlayInfo(
payload,
state.health,
Date.now(),
{
mode: state.mode,
manualTarget: state.manualTarget
}
);
if (!result.entryCount) {
return result;
}
state.lastSource = source;
state.lastWinner = result.winnerHost;
state.currentPlan = result.probePlan.slice();
state.availableHosts = result.availableHosts.slice();
state.nativeAkamaiAvailable =
result.nativeAkamaiAvailable;
state.manualMatched = result.manualMatched;
state.manualMissed = result.manualMissed;
state.benchmarkWinner = bestHealthyHost(
state.currentPlan.map(route => route.host)
);
if (state.mode === 'manual') {
state.phase = 'idle';
state.phaseNote = result.manualMissed
? result.manualMatched
? `手动线路命中 ${result.manualMatched} 条；${result.manualMissed} 条保留原始`
: '本视频没有该手动线路；已保留原始地址'
: `手动线路已应用到 ${result.manualMatched} 条媒体`;
}
renderUi();
scheduleProbe(
result.probePlan,
false,
result.winnerHost
);
return result;
}
function processPayloadText(text, source) {
if (
typeof text !== 'string' ||
!(
text.includes('bilivideo') ||
text.includes('akamaized.net')
)
) {
return { text, changed: false };
}
try {
const payload = nativeJsonParse(text);
const result = processPayloadObject(payload, source);
return {
text: result.changed
? nativeJsonStringify(payload)
: text,
changed: result.changed
};
} catch (_) {
return { text, changed: false };
}
}
function markProbeResource(rawUrl) {
state.probeResourceCounts.set(
rawUrl,
(state.probeResourceCounts.get(rawUrl) || 0) + 1
);
}
function unmarkProbeResource(rawUrl) {
const remaining =
(state.probeResourceCounts.get(rawUrl) || 0) - 1;
if (remaining > 0) {
state.probeResourceCounts.set(rawUrl, remaining);
} else {
state.probeResourceCounts.delete(rawUrl);
}
}
async function probeOnce(route, range) {
const controller =
typeof root.AbortController === 'function'
? new root.AbortController()
: null;
const started = root.performance.now();
let timedOut = false;
markProbeResource(route.url);
const timer = root.setTimeout(() => {
timedOut = true;
controller?.abort();
}, PROBE_TIMEOUT_MS);
try {
const response = await nativeFetch.call(root, route.url, {
method: 'GET',
mode: 'cors',
cache: 'no-store',
credentials: 'omit',
redirect: 'follow',
headers: {
Range: `bytes=${range[0]}-${range[1]}`
},
signal: controller?.signal
});
const ttfbMs = root.performance.now() - started;
// A large 200 means Range was ignored. Aborting that rare
// response is safer than silently downloading a whole video.
if (response.status !== 206) {
controller?.abort();
return {
ok: false,
status: response.status,
bytes: 0,
ttfbMs,
totalMs: timedOut
? PROBE_TIMEOUT_MS
: root.performance.now() - started,
mbps: 0
};
}
// Read the complete small Range. We intentionally do not
// cancel a successful response, avoiding an abort/RST storm.
const body = await response.arrayBuffer();
const totalMs = root.performance.now() - started;
const bytes = body.byteLength;
const transferMs = Math.max(1, totalMs - ttfbMs);
const mbps =
bytes > 0
? (bytes * 8) / 1e6 / (transferMs / 1000)
: 0;
return {
ok: bytes >= Math.min(64 * 1024, PROBE_BYTES),
status: response.status,
bytes,
ttfbMs,
totalMs,
mbps
};
} catch (_) {
return {
ok: false,
status: 0,
bytes: 0,
ttfbMs: 0,
totalMs: timedOut
? PROBE_TIMEOUT_MS
: root.performance.now() - started,
mbps: 0
};
} finally {
root.clearTimeout(timer);
// Resource Timing delivery trails fetch completion slightly.
// Keep the marker long enough that our own test request is
// never presented as the player's "actual" CDN.
root.setTimeout(
() => unmarkProbeResource(route.url),
2000
);
}
}
function probePlanKey(plan) {
return (plan || [])
.map(route => `${route.host}\n${route.url}`)
.sort()
.join('\n---\n');
}
function isCurrentProbe(generation) {
return (
generation === state.probeGeneration &&
generation === state.activeProbeGeneration
);
}
async function runProbe(plan, work, generation) {
if (!isCurrentProbe(generation)) {
return;
}
const routes = uniqueProbeRoutes(plan);
if (!routes.length) {
return;
}
if (!isCurrentProbe(generation)) {
return;
}
state.phase = 'waiting';
state.phaseNote = '';
state.probeProgress = null;
renderUi();
const playbackReady =
await waitForProbeWindow(generation);
if (!isCurrentProbe(generation)) {
return;
}
if (!playbackReady) {
log('播放器尚未形成缓冲，本页跳过后台测速');
state.phase = 'idle';
state.phaseNote = '没有足够缓冲，本页跳过测速';
renderUi();
return;
}
state.phase = 'probing';
announce('CDN 测速开始');
renderUi();
let routesToProbe =
work.kind === 'full'
? routes
: uniqueProbeRoutes(work.routes);
let promotedToFull = work.kind === 'full';
if (work.verifyRoute) {
const verifyRoute =
routes.find(
route =>
route.host === work.verifyRoute.host
) || work.verifyRoute;
if (!hasSafeProbeWindow()) {
log('缓冲下降或正在 seek，停止轻量复核');
state.phase = 'idle';
state.phaseNote = '缓冲下降，轻量复核已中止';
state.probeProgress = null;
renderUi();
return;
}
state.probeProgress = {
host: verifyRoute.host,
hostIndex: 1,
hostTotal: 1,
rangeIndex: 1,
rangeTotal: 1,
verification: true
};
renderUi();
const baseline = state.health[verifyRoute.host];
const verification = await probeOnce(
verifyRoute,
PROBE_RANGES[0]
);
if (!isCurrentProbe(generation)) {
return;
}
if (
baseline &&
isVerificationAcceptable(
verification,
baseline
)
) {
baseline.verifiedAt = Date.now();
saveHealth();
log('轻量复核通过', {
host: verifyRoute.host,
totalMs: Number(
verification.totalMs.toFixed(0)
),
limitMs: Number(
verificationLimitMs(baseline).toFixed(0)
)
});
} else {
promotedToFull = true;
routesToProbe = routes;
state.phaseNote =
'轻量复核未通过，重新测试全部线路';
log('轻量复核未通过，升级为完整测速', {
host: verifyRoute.host,
ok: verification.ok,
totalMs: Number(
(verification.totalMs || 0).toFixed(0)
),
limitMs: Number(
verificationLimitMs(baseline).toFixed(0)
)
});
}
}
if (!routesToProbe.length) {
state.benchmarkWinner = bestHealthyHost(
routes.map(route => route.host)
);
state.phase = state.benchmarkWinner
? 'ready'
: 'failed';
state.phaseNote = '';
state.probeProgress = null;
renderUi();
return;
}
const samples = new Map(
routesToProbe.map(route => [route.host, []])
);
// Serial rounds avoid competing with the video's own startup
// traffic. Reversing round two reduces ordering bias.
for (
let index = 0;
index < routesToProbe.length;
index += 1
) {
const route = routesToProbe[index];
if (!isCurrentProbe(generation)) {
return;
}
if (!hasSafeProbeWindow()) {
log('缓冲下降或正在 seek，停止剩余测速');
state.phase = 'idle';
state.phaseNote = '缓冲下降，测速已中止';
state.probeProgress = null;
renderUi();
return;
}
state.probeProgress = {
host: route.host,
hostIndex: index + 1,
hostTotal: routesToProbe.length,
rangeIndex: 1,
rangeTotal: 2,
verification: false
};
renderUi();
samples
.get(route.host)
.push(await probeOnce(route, PROBE_RANGES[0]));
}
await new Promise(resolve => root.setTimeout(resolve, 1200));
if (!isCurrentProbe(generation)) {
return;
}
const reversed = routesToProbe.slice().reverse();
for (
let index = 0;
index < reversed.length;
index += 1
) {
const route = reversed[index];
if (!isCurrentProbe(generation)) {
return;
}
if (!hasSafeProbeWindow()) {
log('缓冲下降或正在 seek，停止剩余测速');
state.phase = 'idle';
state.phaseNote = '缓冲下降，测速已中止';
state.probeProgress = null;
renderUi();
return;
}
state.probeProgress = {
host: route.host,
hostIndex: index + 1,
hostTotal: routesToProbe.length,
rangeIndex: 2,
rangeTotal: 2,
verification: false
};
renderUi();
samples
.get(route.host)
.push(await probeOnce(route, PROBE_RANGES[1]));
}
if (!isCurrentProbe(generation)) {
return;
}
const sampledAt = Date.now();
const records = routesToProbe.map(route =>
aggregateProbeSamples(
route.host,
samples.get(route.host),
sampledAt
)
);
for (const record of records) {
state.health[record.host] = record;
}
state.lastProbeAt = sampledAt;
saveHealth();
state.benchmarkWinner = bestHealthyHost(
routes.map(route => route.host)
);
if (state.benchmarkWinner) {
state.phase = 'ready';
state.phaseNote = '';
state.probeProgress = null;
log(
promotedToFull
? '完整测速完成'
: '过期线路测速完成',
records.map(record => ({
host: record.host,
success: `${record.successes}/${record.attempts}`,
Mbps: Number(record.medianMbps.toFixed(1)),
TTFB: Number(record.medianTtfbMs.toFixed(0)),
worstMs: Number(record.worstMs.toFixed(0))
}))
);
} else {
state.phase = 'failed';
state.phaseNote = '';
state.probeProgress = null;
log('测速全部失败，保留 B站原始主备地址');
}
renderUi();
}
async function waitForProbeWindow(generation) {
const started = Date.now();
const maxWaitMs = 30 * 1000;
while (Date.now() - started < maxWaitMs) {
if (!isCurrentProbe(generation)) {
return false;
}
if (hasSafeProbeWindow()) {
return true;
}
await new Promise(resolve =>
root.setTimeout(resolve, 1000)
);
}
return false;
}
function hasSafeProbeWindow() {
if (root.document?.hidden) {
return false;
}
const video = root.document?.querySelector?.('video');
if (!video || video.seeking || video.readyState < 2) {
return false;
}
if (video.paused) {
return true;
}
let bufferedAhead = 0;
try {
for (
let index = 0;
index < video.buffered.length;
index += 1
) {
if (
video.buffered.start(index) <= video.currentTime &&
video.buffered.end(index) >= video.currentTime
) {
bufferedAhead = Math.max(
bufferedAhead,
video.buffered.end(index) - video.currentTime
);
}
}
} catch (_) {
return false;
}
// Leave enough runway for one slow timeout without consuming
// the player's visible buffer.
return video.readyState >= 3 && bufferedAhead >= 15;
}
function scheduleProbe(
plan,
force = false,
preferredHost = ''
) {
if (
!state.enabled ||
(!force && !state.autoProbe) ||
!Array.isArray(plan) ||
!plan.length
) {
return;
}
const planCopy = plan.map(route => ({ ...route }));
const key = `${preferredHost}\n${probePlanKey(planCopy)}`;
if (state.probePromise) {
if (
key === state.pendingProbe?.key ||
(key === state.activeProbeKey &&
!state.pendingProbe &&
isCurrentProbe(
state.activeProbeGeneration
))
) {
return;
}
// A SPA navigation can deliver a new signed playurl while
// the previous video's safe-window wait/test is active.
// Invalidate its UI writes and retain only the latest plan.
state.probeGeneration += 1;
state.pendingProbe = {
plan: planCopy,
force,
preferredHost,
key
};
state.phase = 'waiting';
state.phaseNote = '视频已切换，等待重新测速';
state.probeProgress = null;
renderUi();
return;
}
const now = Date.now();
const work = planProbeWork(
planCopy,
state.health,
now,
preferredHost,
force
);
if (work.kind === 'none') {
state.benchmarkWinner = bestHealthyHost(
planCopy.map(route => route.host)
);
state.phase = state.benchmarkWinner
? 'ready'
: 'failed';
state.phaseNote = '';
renderUi();
return;
}
const generation = ++state.probeGeneration;
state.activeProbeGeneration = generation;
state.activeProbeKey = key;
state.activeProbeForced = force;
state.phase = 'waiting';
state.phaseNote = '';
renderUi();
state.probePromise = new Promise(resolve => {
root.setTimeout(resolve, PROBE_DELAY_MS);
})
.then(() => runProbe(planCopy, work, generation))
.catch(error => {
if (isCurrentProbe(generation)) {
state.benchmarkWinner = bestHealthyHost(
planCopy.map(route => route.host)
);
state.phase = state.benchmarkWinner
? 'ready'
: 'failed';
state.phaseNote =
state.benchmarkWinner
? '后台复核异常；继续沿用缓存'
: '测速异常；已保留原始线路';
state.probeProgress = null;
renderUi();
}
log('后台测速异常，保留原始线路', error?.message || error);
})
.finally(() => {
if (
state.activeProbeGeneration === generation
) {
state.probePromise = null;
state.activeProbeGeneration = 0;
state.activeProbeKey = '';
state.activeProbeForced = false;
}
const pending = state.pendingProbe;
state.pendingProbe = null;
if (pending) {
scheduleProbe(
pending.plan,
pending.force,
pending.preferredHost
);
} else {
renderUi();
}
});
}
function cloneResponseWithText(response, text) {
const headers = new NativeHeaders(response.headers);
headers.delete('content-length');
headers.delete('content-encoding');
const rewritten = new NativeResponse(text, {
status: response.status,
statusText: response.statusText,
headers
});
// Some player code inspects these metadata properties. They are
// best-effort only; failure leaves a valid Response object.
for (const key of ['url', 'redirected', 'type']) {
try {
Object.defineProperty(rewritten, key, {
configurable: true,
value: response[key]
});
} catch (_) {}
}
return rewritten;
}
root.fetch = function patchedFetch(input, init) {
const rawUrl = requestUrlOf(input);
observeMediaRequest(rawUrl);
const promise = nativeFetch.apply(this, arguments);
if (!state.enabled || !isPlayUrlApi(rawUrl)) {
return promise;
}
return promise
.then(async response => {
try {
const originalText = await response.clone().text();
const transformed = processPayloadText(
originalText,
'fetch'
);
return transformed.changed
? cloneResponseWithText(
response,
transformed.text
)
: response;
} catch (_) {
return response;
}
})
.catch(error => {
throw error;
});
};
class PatchedXMLHttpRequest extends NativeXHR {
constructor() {
super();
this.__biliAutoCdn = {
url: '',
textDone: false,
text: '',
jsonDone: false,
json: null
};
}
open(method, url, ...rest) {
this.__biliAutoCdn = {
url: requestUrlOf(url),
textDone: false,
text: '',
jsonDone: false,
json: null
};
observeMediaRequest(this.__biliAutoCdn.url);
return super.open(method, url, ...rest);
}
get responseText() {
const original = super.responseText;
if (
!state.enabled ||
this.readyState !== 4 ||
!isPlayUrlApi(this.__biliAutoCdn?.url)
) {
return original;
}
if (!this.__biliAutoCdn.textDone) {
this.__biliAutoCdn.text =
processPayloadText(original, 'xhr').text;
this.__biliAutoCdn.textDone = true;
}
return this.__biliAutoCdn.text;
}
get response() {
const original = super.response;
if (
!state.enabled ||
this.readyState !== 4 ||
!isPlayUrlApi(this.__biliAutoCdn?.url)
) {
return original;
}
if (this.responseType === 'json') {
if (!this.__biliAutoCdn.jsonDone) {
this.__biliAutoCdn.json =
processPayloadObject(original, 'xhr-json')
.payload;
this.__biliAutoCdn.jsonDone = true;
}
return this.__biliAutoCdn.json;
}
if (
this.responseType === '' ||
this.responseType === 'text'
) {
return this.responseText;
}
return original;
}
}
root.XMLHttpRequest = PatchedXMLHttpRequest;
function patchGlobalPlayInfo(name) {
const existing = Object.getOwnPropertyDescriptor(root, name);
// Do not replace an accessor installed by Bilibili or another
// extension. Fetch/XHR interception still covers future API
// responses, and an object returned by its getter can be safely
// transformed in place once.
if (existing && (existing.get || existing.set)) {
try {
const current = existing.get?.call(root);
if (current && typeof current === 'object') {
processPayloadObject(current, name);
}
} catch (_) {}
return;
}
if (existing && existing.configurable === false) {
if (root[name] && typeof root[name] === 'object') {
processPayloadObject(root[name], name);
}
return;
}
let value =
existing && 'value' in existing
? processPayloadObject(existing.value, name).payload
: undefined;
try {
Object.defineProperty(root, name, {
configurable: true,
enumerable: true,
get() {
return value;
},
set(nextValue) {
value = processPayloadObject(
nextValue,
name
).payload;
}
});
} catch (_) {
if (root[name] && typeof root[name] === 'object') {
processPayloadObject(root[name], name);
}
}
}
patchGlobalPlayInfo('__playinfo__');
const publicApi = {
version: VERSION,
status() {
const now = Date.now();
return {
enabled: state.enabled,
mode: state.mode,
manualTarget: state.manualTarget,
autoProbe: state.autoProbe,
phase: state.phase,
preferredHost: state.lastWinner,
observedHost: state.observedHost,
benchmarkWinner: state.benchmarkWinner,
lastSource: state.lastSource,
probing: !!state.probePromise,
manualMatched: state.manualMatched,
manualMissed: state.manualMissed,
availableHosts: state.availableHosts.slice(),
nativeAkamaiAvailable:
state.nativeAkamaiAvailable,
health: Object.values(state.health).map(record => ({
host: record.host,
fresh: isFreshHealth(record, now),
ttlMs: healthTtlMs(record),
verificationDue:
needsHealthVerification(record, now),
ok: record.ok,
success: `${record.successes}/${record.attempts}`,
medianMbps: record.medianMbps,
medianTtfbMs: record.medianTtfbMs,
worstMs: record.worstMs,
sampledAt: new Date(
record.sampledAt
).toISOString(),
verifiedAt: new Date(
verifiedAtOf(record, now)
).toISOString()
}))
};
},
retest() {
if (
state.probePromise ||
!state.enabled ||
!state.currentPlan.length
) {
return false;
}
clearCurrentHealthAndRetest();
return true;
},
setAutoProbe(next = true) {
return setAutoProbeEnabled(next);
},
enable(next = true) {
const saved = saveSettings({
enabled: !!next,
mode: state.mode,
manualTarget: state.manualTarget,
autoProbe: state.autoProbe
});
if (saved) {
root.location.reload();
}
return saved;
},
setMode(mode = 'auto', manualTarget) {
const routeId =
mode === 'original'
? 'original'
: mode === 'manual'
? manualTarget
: 'auto';
if (
!routeDefinition(routeId) ||
(routeId !== 'auto' &&
routeId !== 'original' &&
!availabilityForRoute(
routeDefinition(routeId)
).available)
) {
return false;
}
return saveRouteAndReload(routeId);
},
openPanel() {
setUiOpen(true);
}
};
try {
Object.defineProperty(root, '__BiliAutoCDN', {
configurable: true,
value: Object.freeze(publicApi)
});
} catch (_) {
root.__BiliAutoCDN = publicApi;
}
state.benchmarkWinner = bestHealthyHost();
mountControlUiSoon();
startResourceObserver();
log(
`v${VERSION} installed`,
state.enabled
? `${state.mode}${
state.mode === 'manual'
? `:${state.manualTarget}`
: ''
}`
: 'disabled'
);
}
return {
VERSION,
CACHE_VERSION,
HEALTH_TTL_MS,
FAILED_HEALTH_TTL_MS,
HEALTH_VERIFY_INTERVAL_MS,
PROBE_BYTES,
MAX_PROBE_HOSTS,
UI_POSITION_KEY,
UI_LAUNCHER_SIZE,
UI_VIEWPORT_MARGIN,
UI_DRAG_THRESHOLD_PX,
SAFE_GENERIC_HOSTS,
NATIVE_AKAMAI_ROUTE,
DEFAULT_SETTINGS,
normalizeSettings,
stableUnique,
defaultUiPosition,
clampUiPosition,
pointerMovedBeyondThreshold,
parseUrl,
hostOf,
isAkamaiHost,
isOfficialCdnHost,
isMediaUrl,
isExplicitPcdn,
isObservableMediaRequest,
safeSwapHost,
collectOriginals,
buildCandidates,
healthTtlMs,
healthExpiryAt,
isFreshHealth,
verifiedAtOf,
needsHealthVerification,
verificationLimitMs,
isVerificationAcceptable,
coldOrder,
rankCandidates,
rankManualCandidates,
applyOrdering,
walkMediaEntries,
planFromCandidates,
transformPlayInfo,
median,
aggregateProbeSamples,
compareHealthRecords,
uniqueProbeRoutes,
planProbeWork,
formatProbeAge,
install
};
}
);