safetynet/apps/browser/evidence-delivery.cjs

'use strict';
const {validateDownloadEvidence,validateInteractionEvidence}=require('./evidence-capture.cjs');
function evidenceType(record){return record?.protectedEvidence?.type??'download';}
function policyAllows(context,type='download'){return ['download','interaction'].includes(type)&&context?.policy?.evidence?.enabled===true&&context.policy.evidence[type==='download'?'captureDownloads':'captureInteractions']===true&&Date.parse(context.policy.expiresAt)>Date.now();}
function collectionAllowed(context){return !!context?.ready&&policyAllows(context,context?.type??'download');}
function validatedEvidence(payload,type='download'){if(!(type==='download'?validateDownloadEvidence(payload):type==='interaction'&&validateInteractionEvidence(payload)))throw Error('Invalid protected evidence');return structuredClone(payload);}
function stripPendingEvidence(queue,context){return queue.map(record=>{if(!record.protectedEvidence)return record;if(context&&policyAllows(context,evidenceType(record)))return record;const {protectedEvidence,...event}=record;return event;});}
async function deliverAuditRecord({record,send,getContext}){
 const {protectedEvidence,...event}=record;await send('/api/device/events',event);
 if(!protectedEvidence)return {eventDelivered:true,evidenceDelivered:false};
 const type=evidenceType(record);
 function state(){const context=getContext();if(protectedEvidence.deviceId!==context?.deviceId||context?.policy&&!policyAllows(context,type))return 'discard';if(!context?.ready||!context.policy)return 'pause';return 'allow';}
 const current=state();if(current==='discard')return {eventDelivered:true,evidenceDiscarded:true};if(current==='pause')throw Error('Evidence delivery paused until managed context is ready');
 const payload=validatedEvidence(protectedEvidence.payload,type);
 if(type==='interaction'){
  const expectedKind=payload.captureSource==='guarded-clipboard'?`clipboard.${payload.action}`:'agent.action';
  if(event.kind!==expectedKind||payload.captureSource==='guarded-clipboard'&&!['copy','cut','paste'].includes(payload.action)||payload.captureSource==='agent-adapter'&&payload.action!=='click')throw Error('Invalid protected evidence source');
 }
 try{const result=await send('/api/device/evidence',{eventId:event.eventId,type,payload});
  // A successful network response must not resurrect collection after a
  // concurrent policy revocation or a change of enrolled device.
  const after=state();if(after==='discard')return {eventDelivered:true,evidenceDiscarded:true};if(after==='pause')throw Error('Evidence delivery paused until managed context is ready');
  if(!/^[0-9a-f]{8}-[0-9a-f]{4}-[1-8][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i.test(result?.id||'')||!Number.isSafeInteger(result.sourceEventId)||result.sourceEventId<1)throw Error('Evidence acknowledgement invalid');return {eventDelivered:true,evidenceDelivered:true};}
 catch(error){if(error.status===403)return {eventDelivered:true,evidenceDiscarded:true};throw error;}
}
module.exports={validatedEvidence,collectionAllowed,stripPendingEvidence,deliverAuditRecord,evidenceType,policyAllows};