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sqlite from \"https://esm.town/v/std/sqlite/main.ts\";\nimport * as ed from \"npm:@noble/ed25519@2.2.3\";\n\nconst PROVIDER_FAMILY = \"valtown\";\nconst PROVIDER_ID = \"valtown:sebas1/rumbo-guard-v08-node-b\";\nconst BROKER_PUBLIC = \"N0XOw7o8f14wIAOQRvcCkDGOwN7PDjXS6f6L93GyOuY\";\nconst APPROVER_PUBLIC = \"badOinyx_VSJeSW2xmIDj-6WeDub2SEP7CrogOjPRKU\";\nconst BROKER_AUDIENCE = \"rumbo-broker-v08\";\nconst DEPLOYMENT_DIGEST = \"777025b52967cdd8bc31a172789d1f056d2aa041017477b603187c450036011c\";\nconst te = new TextEncoder();\nconst td = new TextDecoder();\n\nfunction canon(v:any):string { if(v===null||typeof v!==\"object\") return JSON.stringify(v); if(Array.isArray(v)) return \"[\"+v.map(canon).join(\",\")+\"]\"; const ks=Object.keys(v).sort(); return \"{\"+ks.map(k=>JSON.stringify(k)+\":\"+canon(v[k])).join(\",\")+\"}\"; }\nfunction bytesToB64u(b:Uint8Array):string { let s=\"\"; for(const x of b)s+=String.fromCharCode(x); return btoa(s).replace(/\\+/g,\"-\").replace(/\\//g,\"_\").replace(/=+$/g,\"\"); }\nfunction b64uToBytes(s:string):Uint8Array { const p=s+\"=\".repeat((4-s.length%4)%4); const bin=atob(p.replace(/-/g,\"+\").replace(/_/g,\"/\")); const out=Uint8Array.from(bin,c=>c.charCodeAt(0)); if(bytesToB64u(out)!==s) throw new Error(\"B64\"); return out; }\nasync function sha256Bytes(b:Uint8Array):Promise{ return new Uint8Array(await crypto.subtle.digest(\"SHA-256\",b)); }\nasync function sha256HexBytes(b:Uint8Array):Promise{ const d=await sha256Bytes(b); return [...d].map(x=>x.toString(16).padStart(2,\"0\")).join(\"\"); }\nasync function sha256HexText(s:string):Promise{ return sha256HexBytes(te.encode(s)); }\nasync function keyId(pub:Uint8Array):Promise{ return (await sha256HexBytes(pub)).slice(0,32); }\nfunction isHex64(v:any):boolean { return typeof v===\"string\" && /^[0-9a-f]{64}$/.test(v); }\nfunction isNonce(v:any):boolean { return typeof v===\"string\" && /^[0-9a-f]{32}$/.test(v); }\nasync function rootSeed():Promise{ const v=Deno.env.get(\"RUMBO_V08_ROOT_SEED\"); if(!v) throw new Error(\"SECRET\"); const b=b64uToBytes(v); if(b.length!==32) throw new Error(\"SECRET\"); return b; }\nasync function roleSeed(role:string):Promise{ const root=await rootSeed(); const suffix=te.encode(\"rumbo-v08:\"+role); const mix=new Uint8Array(root.length+suffix.length); mix.set(root); mix.set(suffix,root.length); return sha256Bytes(mix); }\nasync function ensure(){ await sqlite.execute(`CREATE TABLE IF NOT EXISTS v08_replay(nonce TEXT PRIMARY KEY, exp INTEGER NOT NULL)`); await sqlite.execute(`CREATE TABLE IF NOT EXISTS v08_grants(nonce TEXT PRIMARY KEY, exp INTEGER NOT NULL)`); await sqlite.execute(`CREATE TABLE IF NOT EXISTS v08_witness(seq INTEGER PRIMARY KEY, head TEXT NOT NULL, previous_receipt_hash TEXT NOT NULL, observed_at INTEGER NOT NULL, signature TEXT NOT NULL, receipt_hash TEXT NOT NULL)`); }\nasync function consume(table:\"v08_replay\"|\"v08_grants\",nonce:string,exp:number):Promise{ await ensure(); const now=Math.floor(Date.now()/1000); try { await sqlite.execute({sql:`DELETE FROM ${table} WHERE exp < ?`,args:[now]}); await sqlite.execute({sql:`INSERT INTO ${table}(nonce,exp) VALUES (?,?)`,args:[nonce,exp]}); return true; } catch { return false; } }\nasync function verifyProviderRequest(req:any,op:string):Promise{ try { const e=req?.envelope, sig=req?.signature; if(!e||typeof sig!==\"string\"||e.v!==8||e.op!==op||e.deployment_digest!==DEPLOYMENT_DIGEST) return null; const now=Math.floor(Date.now()/1000), iat=Number(e.iat), exp=Number(e.exp); if(!Number.isInteger(iat)||!Number.isInteger(exp)||iat>now+30||exp300||!isNonce(e.nonce)) return null; if(!await ed.verifyAsync(b64uToBytes(sig),te.encode(canon(e)),b64uToBytes(BROKER_PUBLIC))) return null; if(!await consume(\"v08_replay\",e.nonce,exp)) return null; return e.body&&typeof e.body===\"object\"&&!Array.isArray(e.body)?e.body:null; } catch { return null; } }\nasync function verifyGrant(grant:string,permitDigest:string):Promise{ try { const p=grant.split(\".\"); if(p.length!==3||p[0]!==\"ag3\") return null; if(!await ed.verifyAsync(b64uToBytes(p[2]),te.encode(p[1]),b64uToBytes(APPROVER_PUBLIC))) return null; const g=JSON.parse(td.decode(b64uToBytes(p[1]))); const now=Math.floor(Date.now()/1000); const iat=Number(g.iat), exp=Number(g.exp); if(g.v!==3||g.broker_audience!==BROKER_AUDIENCE||g.deployment_digest!==DEPLOYMENT_DIGEST||g.permit_body_digest!==permitDigest) return null; if(!Number.isInteger(iat)||!Number.isInteger(exp)||iat>now+30||exp300||!isNonce(g.nonce)) return null; if(!await consume(\"v08_grants\",g.nonce,exp)) return null; return g; } catch { return null; } }\nasync function identity(){ const sp=await ed.getPublicKeyAsync(await roleSeed(\"signer\")); const wp=await ed.getPublicKeyAsync(await roleSeed(\"witness\")); return {v:8,provider_family:PROVIDER_FAMILY,provider_id:PROVIDER_ID,signer_public_key:bytesToB64u(sp),signer_key_id:await keyId(sp),witness_public_key:bytesToB64u(wp),witness_key_id:await keyId(wp)}; }\nasync function observe(body:any){ const seq=Number(body?.seq), head=String(body?.head||\"\"); if(!Number.isInteger(seq)||seq<1||!isHex64(head)) throw new Error(\"REJECT\"); await ensure(); const rows=await sqlite.execute({sql:\"SELECT seq,head,receipt_hash,previous_receipt_hash,observed_at,signature FROM v08_witness ORDER BY seq DESC LIMIT 1\"}); const last=(rows.rows||[])[0] as any; if(last&&Number(last.seq)===seq){ if(String(last.head)!==head) throw new Error(\"REJECT\"); const pub=await ed.getPublicKeyAsync(await roleSeed(\"witness\")); return {v:8,provider_family:PROVIDER_FAMILY,provider_id:PROVIDER_ID,key_id:await keyId(pub),seq,head,previous_receipt_hash:String(last.previous_receipt_hash),observed_at:Number(last.observed_at),signature:String(last.signature)}; } if((last?Number(last.seq):0)+1!==seq) throw new Error(\"REJECT\"); const pub=await ed.getPublicKeyAsync(await roleSeed(\"witness\")); const payload={v:8,provider_family:PROVIDER_FAMILY,provider_id:PROVIDER_ID,key_id:await keyId(pub),seq,head,previous_receipt_hash:last?String(last.receipt_hash):\"0\".repeat(64),observed_at:Math.floor(Date.now()/1000)}; const signature=bytesToB64u(await ed.signAsync(te.encode(canon(payload)),await roleSeed(\"witness\"))); const rh=await sha256HexText(canon({...payload,signature})); try { await sqlite.execute({sql:\"INSERT INTO v08_witness(seq,head,previous_receipt_hash,observed_at,signature,receipt_hash) VALUES (?,?,?,?,?,?)\",args:[seq,head,payload.previous_receipt_hash,payload.observed_at,signature,rh]}); } catch { throw new Error(\"REJECT\"); } return {...payload,signature}; }\nasync function signPermit(body:any){ const pb=body?.permit_body, grant=String(body?.approval_grant||\"\"); if(!pb||typeof pb!==\"object\"||Array.isArray(pb)) throw new Error(\"REJECT\"); const digest=await sha256HexText(canon(pb)); const g=await verifyGrant(grant,digest); if(!g) throw new Error(\"REJECT\"); if(pb.v!==8||pb.broker_audience!==BROKER_AUDIENCE||pb.deployment_digest!==DEPLOYMENT_DIGEST) throw new Error(\"REJECT\"); const now=Math.floor(Date.now()/1000), iat=Number(pb.iat), exp=Number(pb.exp); if(!Number.isInteger(iat)||!Number.isInteger(exp)||iat>now+30||exp300||exp>Number(g.exp)||!isNonce(pb.nonce)) throw new Error(\"REJECT\"); for(const k of [\"task_id\",\"plan_id\",\"policy_digest\",\"request_digest\"]) if(String(pb[k])!==String(g[k])) throw new Error(\"REJECT\"); if(!isHex64(pb.policy_digest)||!isHex64(pb.request_digest)) throw new Error(\"REJECT\"); const priv=await roleSeed(\"signer\"), pub=await ed.getPublicKeyAsync(priv); return {v:8,provider_family:PROVIDER_FAMILY,provider_id:PROVIDER_ID,key_id:await keyId(pub),permit_body_digest:digest,signature:bytesToB64u(await ed.signAsync(te.encode(canon(pb)),priv))}; }\nexport default async function(req:Request):Promise{ try { if(req.method===\"GET\") return Response.json(await identity(),{headers:{\"Cache-Control\":\"no-store\"}}); if(req.method!==\"POST\") return new Response(\"method\",{status:405}); const len=Number(req.headers.get(\"content-length\")||\"0\"); if(len>65536) return Response.json({ok:false,error:\"REJECTED\"},{status:413}); const raw=await req.json(); const op=raw?.envelope?.op; if(op!==\"observe\"&&op!==\"sign_permit\") return Response.json({ok:false,error:\"REJECTED\"},{status:400}); const body=await verifyProviderRequest(raw,op); if(!body) return Response.json({ok:false,error:\"REJECTED\"},{status:401}); const result=op===\"observe\"?await observe(body):await signPermit(body); return Response.json({ok:true,result},{headers:{\"Cache-Control\":\"no-store\"}}); } catch { return Response.json({ok:false,error:\"REJECTED\"},{status:400,headers:{\"Cache-Control\":\"no-store\"}}); } 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