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Preserve verified N-1 app boot after a cache entry is lost

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This commit is contained in:
Jonathan Sykes
2026-10-08 09:10:28 +08:00
parent 639f0a2257
commit 3505dc3c0e
2 changed files with 49 additions and 18 deletions
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19
frontend/app-bootstrap.test.js
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@@ -3,16 +3,18 @@ const assert=require('node:assert/strict');
const {webcrypto,createHash}=require('node:crypto');
const vm=require('node:vm');
const {readFileSync}=require('node:fs');
function fixture({cached=false,tampered=false,enabled=true,loading=false,quota=false,insecure=false}={}){
function fixture({cached=false,tampered=false,enabled=true,loading=false,quota=false,insecure=false,previous=false,contract=1}={}){
const source='window.appRuns=(window.appRuns||0)+1; window.boot=()=>window.bootRuns=(window.bootRuns||0)+1; document.addEventListener("DOMContentLoaded",boot);',hash=createHash('sha256').update(source).digest('hex'), key='/app.js?v='+hash.slice(0,10);
const oldSource='window.oldApp=true;'+source, oldHash=createHash('sha256').update(oldSource).digest('hex').slice(0,10), oldKey='/app.js?v='+oldHash;
const held=new Map(), appended=[],listeners={};let calls=0;
const response=()=>new Response(tampered?'bad':source,{headers:{'X-Asset-Hash':hash.slice(0,10)}});
if(cached)held.set(key,response());
const root={crypto:insecure?undefined:webcrypto,TextDecoder,Uint8Array,btoa,console,Lazy:{manifest:{appCache:enabled,files:{'/app.js':{h:hash.slice(0,10)}}},url:()=>key},fetch:async()=>{calls++;return response();},caches:{open:async()=>({match:async k=>held.get(k)?.clone(),put:async(k,r)=>{if(quota)throw Error('quota');held.set(k,r.clone());}})}};
const doc=root.document={readyState:loading?'loading':'complete',querySelector:()=>({content:"script-src 'self' 'sha256-"+Buffer.from(hash,'hex').toString('base64')+"'"}),addEventListener:(name,fn)=>(listeners[name] ||= []).push(fn),createElement:()=>({remove(){this.removed=true;}}),head:{append(node){appended.push(node);if(node.textContent)vm.runInContext(node.textContent,context);else {vm.runInContext(source,context);queueMicrotask(()=>node.onload());}}}};
if(previous){held.set(oldKey,new Response(oldSource,{headers:{'X-Asset-Hash':oldHash}}));held.set('/__ytp_asset_state',Response.json({previous:{files:{'/app.js':{h:oldHash}},groups:{core:{contract,files:['/app.js']}}}}));}
const root={crypto:insecure?undefined:webcrypto,TextDecoder,Uint8Array,btoa,console,AssetSyncCore:require('./asset-sync-core'),navigator:{serviceWorker:{controller:{}}},Lazy:{manifest:{groups:{core:{contract:1,files:['/app.js']}},appCache:enabled,files:{'/app.js':{h:hash.slice(0,10)}}},url:()=>key},fetch:async()=>{calls++;return previous?new Response(oldSource,{headers:{'X-Asset-Hash':oldHash}}):response();},caches:{open:async()=>({match:async k=>held.get(k)?.clone(),put:async(k,r)=>{if(quota)throw Error('quota');held.set(k,r.clone());}})}};
const doc=root.document={readyState:loading?'loading':'complete',querySelector:()=>({content:"script-src 'self' 'sha256-"+Buffer.from(hash,'hex').toString('base64')+"'"}),addEventListener:(name,fn)=>(listeners[name] ||= []).push(fn),createElement:()=>({remove(){this.removed=true;}}),head:{append(node){appended.push(node);if(node.textContent)vm.runInContext(node.textContent,context);else {vm.runInContext(node.src===oldKey?oldSource:source,context);queueMicrotask(()=>node.onload());}}}};
root.window=root;const context=vm.createContext(root);
vm.runInContext(readFileSync(require.resolve('./app-bootstrap.js'),'utf8'),context);
return {root,held,appended,listeners,key,calls:()=>calls,doc,response};
return {root,held,appended,listeners,key,calls:()=>calls,doc,response,oldKey};
}
test('cold boot caches verified app before execution so worker skips its download',async()=>{
const f=fixture();await f.root.AppBootstrap.ready;assert.equal(f.calls(),1);assert.ok(f.held.has(f.key));assert.equal(f.root.appRuns,1);assert.equal(f.root.bootRuns,1);assert.equal(f.appended[0].src,undefined);assert.equal(f.appended[0].removed,true);
@@ -43,3 +45,12 @@ test('the early head response is consumed without a second page fetch',async()=>
test('insecure local HTTP boot retains external execution without WebCrypto',async()=>{
const f=fixture({insecure:true});await f.root.AppBootstrap.ready;assert.equal(f.calls(),0);assert.equal(f.appended[0].src,f.key);assert.equal(f.root.bootRuns,1);
});
test('missing current app uses verified same-contract N-1 offline through the controlling worker',async()=>{
const f=fixture({previous:true});await f.root.AppBootstrap.ready;
assert.equal(f.appended[0].src,f.oldKey);assert.equal(f.root.oldApp,true);assert.equal(f.root.bootRuns,1);assert.equal(f.held.has(f.key),false);
});
test('an incompatible previous core never executes against the new shell',async()=>{
const f=fixture({previous:true,contract:2});await assert.rejects(f.root.AppBootstrap.ready,/hash/);assert.equal(f.root.appRuns,undefined);
});