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Skip it and ship a custom enricher if your strategy differs.",[621,622,628],"pre",{"className":623,"code":624,"filename":625,"language":626,"meta":627,"style":627},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { auditEnricher } from 'evlog'\n\nnitro.hooks.hook('evlog:enrich', auditEnricher())\n","server\u002Fplugins\u002Fevlog.ts","typescript","",[592,629,630,663,670],{"__ignoreMap":627},[631,632,635,639,643,647,650,653,656,660],"span",{"class":633,"line":634},"line",1,[631,636,638],{"class":637},"s7zQu","import",[631,640,642],{"class":641},"sMK4o"," {",[631,644,646],{"class":645},"sTEyZ"," auditEnricher",[631,648,649],{"class":641}," }",[631,651,652],{"class":637}," from",[631,654,655],{"class":641}," '",[631,657,659],{"class":658},"sfazB","evlog",[631,661,662],{"class":641},"'\n",[631,664,666],{"class":633,"line":665},2,[631,667,669],{"emptyLinePlaceholder":668},true,"\n",[631,671,673,676,679,682,684,688,691,694,697,699,702,704],{"class":633,"line":672},3,[631,674,675],{"class":645},"nitro",[631,677,678],{"class":641},".",[631,680,681],{"class":645},"hooks",[631,683,678],{"class":641},[631,685,687],{"class":686},"s2Zo4","hook",[631,689,690],{"class":645},"(",[631,692,693],{"class":641},"'",[631,695,696],{"class":658},"evlog:enrich",[631,698,693],{"class":641},[631,700,701],{"class":641},",",[631,703,646],{"class":686},[631,705,706],{"class":645},"())\n",[588,708,709],{},"For multi-tenant apps and custom session bridges, pass options:",[621,711,713],{"className":623,"code":712,"language":626,"meta":627,"style":627},"nitro.hooks.hook('evlog:enrich', auditEnricher({\n  tenantId: ctx => ctx.event.tenant as string | undefined,\n  bridge: { getSession: async ctx => readSessionActor(ctx.headers) },\n}))\n",[592,714,715,744,788,824],{"__ignoreMap":627},[631,716,717,719,721,723,725,727,729,731,733,735,737,739,741],{"class":633,"line":634},[631,718,675],{"class":645},[631,720,678],{"class":641},[631,722,681],{"class":645},[631,724,678],{"class":641},[631,726,687],{"class":686},[631,728,690],{"class":645},[631,730,693],{"class":641},[631,732,696],{"class":658},[631,734,693],{"class":641},[631,736,701],{"class":641},[631,738,646],{"class":686},[631,740,690],{"class":645},[631,742,743],{"class":641},"{\n",[631,745,746,749,752,756,760,762,764,767,769,772,775,779,782,785],{"class":633,"line":665},[631,747,748],{"class":686},"  tenantId",[631,750,751],{"class":641},":",[631,753,755],{"class":754},"sHdIc"," ctx",[631,757,759],{"class":758},"spNyl"," =>",[631,761,755],{"class":645},[631,763,678],{"class":641},[631,765,766],{"class":645},"event",[631,768,678],{"class":641},[631,770,771],{"class":645},"tenant ",[631,773,774],{"class":637},"as",[631,776,778],{"class":777},"sBMFI"," string",[631,780,781],{"class":641}," |",[631,783,784],{"class":777}," undefined",[631,786,787],{"class":641},",\n",[631,789,790,794,796,798,801,803,806,808,810,813,816,818,821],{"class":633,"line":672},[631,791,793],{"class":792},"swJcz","  bridge",[631,795,751],{"class":641},[631,797,642],{"class":641},[631,799,800],{"class":686}," getSession",[631,802,751],{"class":641},[631,804,805],{"class":758}," async",[631,807,755],{"class":754},[631,809,759],{"class":758},[631,811,812],{"class":686}," readSessionActor",[631,814,815],{"class":645},"(ctx",[631,817,678],{"class":641},[631,819,820],{"class":645},"headers) ",[631,822,823],{"class":641},"},\n",[631,825,827,830],{"class":633,"line":826},4,[631,828,829],{"class":641},"}",[631,831,832],{"class":645},"))\n",[588,834,835,836,838,839,842,843,846,847,850],{},"Without ",[592,837,594],{},", ",[592,840,841],{},"audit.context"," stays empty, and auditors and incident responders need at least ",[592,844,845],{},"requestId"," and ",[592,848,849],{},"ip"," to triangulate a recorded action.",[605,852,854],{"id":853},"auditonly",[592,855,856],{},"auditOnly()",[858,859,860,864,865,868,869,872,873,876],"tip",{},[861,862,863],"strong",{},"Why filter audits to a separate drain?"," Three reasons: ",[861,866,867],{},"cost"," (audit volume is tiny next to product telemetry, so keep them separate and retention costs don't explode), ",[861,870,871],{},"permissions"," (the audit dataset should be read-only for engineers and write-only for the app), and ",[861,874,875],{},"retention"," (audits often live 7+ years; product logs rarely live more than 90 days).",[588,878,879,882,883,886,887,890],{},[592,880,881],{},"auditOnly(drain)"," only forwards events with an ",[592,884,885],{},"audit"," field. Compose with ",[861,888,889],{},"any"," drain:",[621,892,894],{"className":623,"code":893,"language":626,"meta":627,"style":627},"import { auditOnly } from 'evlog'\nimport { createAxiomDrain } from 'evlog\u002Faxiom'\n\n\u002F\u002F Send audits to a dedicated Axiom dataset:\nnitro.hooks.hook('evlog:drain', auditOnly(\n  createAxiomDrain({ dataset: 'audit', apiKey: process.env.AXIOM_AUDIT_API_KEY }),\n))\n",[592,895,896,915,935,939,945,974,1023],{"__ignoreMap":627},[631,897,898,900,902,905,907,909,911,913],{"class":633,"line":634},[631,899,638],{"class":637},[631,901,642],{"class":641},[631,903,904],{"class":645}," auditOnly",[631,906,649],{"class":641},[631,908,652],{"class":637},[631,910,655],{"class":641},[631,912,659],{"class":658},[631,914,662],{"class":641},[631,916,917,919,921,924,926,928,930,933],{"class":633,"line":665},[631,918,638],{"class":637},[631,920,642],{"class":641},[631,922,923],{"class":645}," createAxiomDrain",[631,925,649],{"class":641},[631,927,652],{"class":637},[631,929,655],{"class":641},[631,931,932],{"class":658},"evlog\u002Faxiom",[631,934,662],{"class":641},[631,936,937],{"class":633,"line":672},[631,938,669],{"emptyLinePlaceholder":668},[631,940,941],{"class":633,"line":826},[631,942,944],{"class":943},"sHwdD","\u002F\u002F Send audits to a dedicated Axiom dataset:\n",[631,946,948,950,952,954,956,958,960,962,965,967,969,971],{"class":633,"line":947},5,[631,949,675],{"class":645},[631,951,678],{"class":641},[631,953,681],{"class":645},[631,955,678],{"class":641},[631,957,687],{"class":686},[631,959,690],{"class":645},[631,961,693],{"class":641},[631,963,964],{"class":658},"evlog:drain",[631,966,693],{"class":641},[631,968,701],{"class":641},[631,970,904],{"class":686},[631,972,973],{"class":645},"(\n",[631,975,977,980,982,985,988,990,992,994,996,998,1001,1003,1006,1008,1011,1013,1016,1018,1021],{"class":633,"line":976},6,[631,978,979],{"class":686},"  createAxiomDrain",[631,981,690],{"class":645},[631,983,984],{"class":641},"{",[631,986,987],{"class":792}," dataset",[631,989,751],{"class":641},[631,991,655],{"class":641},[631,993,885],{"class":658},[631,995,693],{"class":641},[631,997,701],{"class":641},[631,999,1000],{"class":792}," apiKey",[631,1002,751],{"class":641},[631,1004,1005],{"class":645}," process",[631,1007,678],{"class":641},[631,1009,1010],{"class":645},"env",[631,1012,678],{"class":641},[631,1014,1015],{"class":645},"AXIOM_AUDIT_API_KEY ",[631,1017,829],{"class":641},[631,1019,1020],{"class":645},")",[631,1022,787],{"class":641},[631,1024,1026],{"class":633,"line":1025},7,[631,1027,832],{"class":645},[588,1029,1030,1031,1034],{},"Set ",[592,1032,1033],{},"await: true"," to make audit writes synchronous (no fire-and-forget for audits, so crash-safe by default):",[621,1036,1038],{"className":623,"code":1037,"language":626,"meta":627,"style":627},"auditOnly(createFsDrain({ dir: '.audit' }), { await: true })\n",[592,1039,1040],{"__ignoreMap":627},[631,1041,1042,1044,1046,1049,1051,1053,1056,1058,1060,1063,1065,1067,1069,1071,1073,1076,1078,1082,1084],{"class":633,"line":634},[631,1043,598],{"class":686},[631,1045,690],{"class":645},[631,1047,1048],{"class":686},"createFsDrain",[631,1050,690],{"class":645},[631,1052,984],{"class":641},[631,1054,1055],{"class":792}," dir",[631,1057,751],{"class":641},[631,1059,655],{"class":641},[631,1061,1062],{"class":658},".audit",[631,1064,693],{"class":641},[631,1066,649],{"class":641},[631,1068,1020],{"class":645},[631,1070,701],{"class":641},[631,1072,642],{"class":641},[631,1074,1075],{"class":792}," await",[631,1077,751],{"class":641},[631,1079,1081],{"class":1080},"sfNiH"," true",[631,1083,649],{"class":641},[631,1085,1086],{"class":645},")\n",[588,1088,1089,1090,1092],{},"The ",[592,1091,1033],{}," flag costs you a small bit of latency per request that records an audit (one synchronous drain call), but guarantees the audit hits disk before the response is sent. For compliance-grade audits, the trade-off is always worth it.",[605,1094,1095],{"id":602},[592,1096,1097],{},"signed()",[588,1099,1100,1103],{},[592,1101,1102],{},"signed(drain, opts)"," adds tamper-evident integrity. Two strategies:",[1105,1106,1107,1123],"table",{},[1108,1109,1110],"thead",{},[1111,1112,1113,1117,1120],"tr",{},[1114,1115,1116],"th",{},"Strategy",[1114,1118,1119],{},"What it adds",[1114,1121,1122],{},"Use case",[1124,1125,1126,1143],"tbody",{},[1111,1127,1128,1134,1140],{},[1129,1130,1131],"td",{},[592,1132,1133],{},"'hmac'",[1129,1135,1136,1139],{},[592,1137,1138],{},"event.audit.signature"," (HMAC of the canonical event)",[1129,1141,1142],{},"Single-event integrity check (any later mutation fails verification).",[1111,1144,1145,1150,1158],{},[1129,1146,1147],{},[592,1148,1149],{},"'hash-chain'",[1129,1151,1152,846,1155],{},[592,1153,1154],{},"event.audit.prevHash",[592,1156,1157],{},"event.audit.hash",[1129,1159,1160],{},"A verifiable chain — deletions and reordering also become detectable.",[858,1162,1163,1169,1170,1174,1175,1177],{},[861,1164,1165,1166,1168],{},"What ",[592,1167,1097],{}," actually buys you."," Detection, not prevention. Anyone with write access to the underlying drain can still nuke the file or table, but the chain proves ",[1171,1172,1173],"em",{},"which"," events were dropped or modified after the fact. Skip ",[592,1176,1097],{}," if you already write to an append-only \u002F WORM store (S3 Object Lock, Postgres with row-level immutability, BigQuery append-only tables); doubling integrity layers just adds latency without raising the bar.",[1179,1180,1182],"h3",{"id":1181},"hmac","HMAC",[588,1184,1185],{},"Each event gets a signature. Tampering with one row breaks that row's verification, but doesn't break later rows.",[621,1187,1189],{"className":623,"code":1188,"language":626,"meta":627,"style":627},"import { signed } from 'evlog'\n\nsigned(drain, { strategy: 'hmac', secret: process.env.AUDIT_SECRET! })\n",[592,1190,1191,1210,1214],{"__ignoreMap":627},[631,1192,1193,1195,1197,1200,1202,1204,1206,1208],{"class":633,"line":634},[631,1194,638],{"class":637},[631,1196,642],{"class":641},[631,1198,1199],{"class":645}," signed",[631,1201,649],{"class":641},[631,1203,652],{"class":637},[631,1205,655],{"class":641},[631,1207,659],{"class":658},[631,1209,662],{"class":641},[631,1211,1212],{"class":633,"line":665},[631,1213,669],{"emptyLinePlaceholder":668},[631,1215,1216,1218,1221,1223,1225,1228,1230,1232,1234,1236,1238,1241,1243,1245,1247,1249,1251,1254,1257,1259],{"class":633,"line":672},[631,1217,602],{"class":686},[631,1219,1220],{"class":645},"(drain",[631,1222,701],{"class":641},[631,1224,642],{"class":641},[631,1226,1227],{"class":792}," strategy",[631,1229,751],{"class":641},[631,1231,655],{"class":641},[631,1233,1181],{"class":658},[631,1235,693],{"class":641},[631,1237,701],{"class":641},[631,1239,1240],{"class":792}," secret",[631,1242,751],{"class":641},[631,1244,1005],{"class":645},[631,1246,678],{"class":641},[631,1248,1010],{"class":645},[631,1250,678],{"class":641},[631,1252,1253],{"class":645},"AUDIT_SECRET",[631,1255,1256],{"class":641},"!",[631,1258,649],{"class":641},[631,1260,1086],{"class":645},[1179,1262,1264],{"id":1263},"hash-chain","Hash-chain",[588,1266,1267],{},"Each event references the previous event's hash. Deleting any row breaks the chain forward of that point, so the verifier can pinpoint the exact row that was tampered with.",[621,1269,1271],{"className":623,"code":1270,"language":626,"meta":627,"style":627},"signed(drain, {\n  strategy: 'hash-chain',\n  state: {\n    load: () => fs.readFile('.audit\u002Fhead', 'utf8').catch(() => null),\n    save: (h) => fs.writeFile('.audit\u002Fhead', h),\n  },\n})\n",[592,1272,1273,1284,1299,1308,1367,1406,1411],{"__ignoreMap":627},[631,1274,1275,1277,1279,1281],{"class":633,"line":634},[631,1276,602],{"class":686},[631,1278,1220],{"class":645},[631,1280,701],{"class":641},[631,1282,1283],{"class":641}," {\n",[631,1285,1286,1289,1291,1293,1295,1297],{"class":633,"line":665},[631,1287,1288],{"class":792},"  strategy",[631,1290,751],{"class":641},[631,1292,655],{"class":641},[631,1294,1263],{"class":658},[631,1296,693],{"class":641},[631,1298,787],{"class":641},[631,1300,1301,1304,1306],{"class":633,"line":672},[631,1302,1303],{"class":792},"  state",[631,1305,751],{"class":641},[631,1307,1283],{"class":641},[631,1309,1310,1313,1315,1318,1320,1323,1325,1328,1330,1332,1335,1337,1339,1341,1344,1346,1348,1350,1353,1355,1358,1360,1363,1365],{"class":633,"line":826},[631,1311,1312],{"class":686},"    load",[631,1314,751],{"class":641},[631,1316,1317],{"class":641}," ()",[631,1319,759],{"class":758},[631,1321,1322],{"class":645}," fs",[631,1324,678],{"class":641},[631,1326,1327],{"class":686},"readFile",[631,1329,690],{"class":645},[631,1331,693],{"class":641},[631,1333,1334],{"class":658},".audit\u002Fhead",[631,1336,693],{"class":641},[631,1338,701],{"class":641},[631,1340,655],{"class":641},[631,1342,1343],{"class":658},"utf8",[631,1345,693],{"class":641},[631,1347,1020],{"class":645},[631,1349,678],{"class":641},[631,1351,1352],{"class":686},"catch",[631,1354,690],{"class":645},[631,1356,1357],{"class":641},"()",[631,1359,759],{"class":758},[631,1361,1362],{"class":641}," null",[631,1364,1020],{"class":645},[631,1366,787],{"class":641},[631,1368,1369,1372,1374,1377,1380,1382,1384,1386,1388,1391,1393,1395,1397,1399,1401,1404],{"class":633,"line":947},[631,1370,1371],{"class":686},"    save",[631,1373,751],{"class":641},[631,1375,1376],{"class":641}," (",[631,1378,1379],{"class":754},"h",[631,1381,1020],{"class":641},[631,1383,759],{"class":758},[631,1385,1322],{"class":645},[631,1387,678],{"class":641},[631,1389,1390],{"class":686},"writeFile",[631,1392,690],{"class":645},[631,1394,693],{"class":641},[631,1396,1334],{"class":658},[631,1398,693],{"class":641},[631,1400,701],{"class":641},[631,1402,1403],{"class":645}," h)",[631,1405,787],{"class":641},[631,1407,1408],{"class":633,"line":976},[631,1409,1410],{"class":641},"  },\n",[631,1412,1413,1415],{"class":633,"line":1025},[631,1414,829],{"class":641},[631,1416,1086],{"class":645},[588,1418,1089,1419,1422],{},[592,1420,1421],{},"state"," config is required for cross-process or durable chains: load the previous head hash from your own store (Redis, Postgres, file) before each event, save the new head after.",[1424,1425],"hash-chain-tamper",{},[1427,1428,1429,1430,1433,1434,1437,1438,678],"note",{},"A CLI to walk and verify the chain (",[592,1431,1432],{},"evlog audit verify",") is on the roadmap. 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