2 files changed, 124 insertions, 1 deletions

diff --git a/server/helpers/audit-logger.ts b/server/helpers/audit-logger.ts
new file mode 100644
index 000000000..4b237316f
--- /dev/null
+++ b/server/helpers/audit-logger.ts
@@ -0,0 +1,123 @@
+import * as path from 'path'
+import { diff } from 'deep-object-diff'
+import { chain } from 'lodash'
+import * as flatten from 'flat'
+import * as winston from 'winston'
+import { CONFIG } from '../initializers'
+import { jsonLoggerFormat, labelFormatter } from './logger'
+import { VideoDetails } from '../../shared'
+
+enum AUDIT_TYPE {
+  CREATE = 'create',
+  UPDATE = 'update',
+  DELETE = 'delete'
+}
+
+const colors = winston.config.npm.colors
+colors.audit = winston.config.npm.colors.info
+
+winston.addColors(colors)
+
+const auditLogger = winston.createLogger({
+  levels: { audit: 0 },
+  transports: [
+    new winston.transports.File({
+      filename: path.join(CONFIG.STORAGE.LOG_DIR, 'peertube-audit.log'),
+      level: 'audit',
+      maxsize: 5242880,
+      maxFiles: 5,
+      format: winston.format.combine(
+        winston.format.timestamp(),
+        labelFormatter,
+        winston.format.splat(),
+        jsonLoggerFormat
+      )
+    })
+  ],
+  exitOnError: true
+})
+
+function auditLoggerWrapper (domain: string, user: string, action: AUDIT_TYPE, entity: EntityAuditView, oldEntity: EntityAuditView = null) {
+  let entityInfos: object
+  if (action === AUDIT_TYPE.UPDATE && oldEntity) {
+    const oldEntityKeys = oldEntity.toLogKeys()
+    const diffObject = diff(oldEntityKeys, entity.toLogKeys())
+    const diffKeys = Object.entries(diffObject).reduce((newKeys, entry) => {
+      newKeys[`new-${entry[0]}`] = entry[1]
+      return newKeys
+    }, {})
+    entityInfos = { ...oldEntityKeys, ...diffKeys }
+  } else {
+    entityInfos = { ...entity.toLogKeys() }
+  }
+  auditLogger.log('audit', JSON.stringify({
+    user,
+    domain,
+    action,
+    ...entityInfos
+  }))
+}
+
+function auditLoggerFactory (domain: string) {
+  return {
+    create (user: string, entity: EntityAuditView) {
+      auditLoggerWrapper(domain, user, AUDIT_TYPE.CREATE, entity)
+    },
+    update (user: string, entity: EntityAuditView, oldEntity: EntityAuditView) {
+      auditLoggerWrapper(domain, user, AUDIT_TYPE.UPDATE, entity, oldEntity)
+    },
+    delete (user: string, entity: EntityAuditView) {
+      auditLoggerWrapper(domain, user, AUDIT_TYPE.DELETE, entity)
+    }
+  }
+}
+
+abstract class EntityAuditView {
+  constructor (private keysToKeep: Array<string>, private prefix: string, private entityInfos: object) { }
+  toLogKeys (): object {
+    return chain(flatten(this.entityInfos, { delimiter: '-', safe: true }))
+      .pick(this.keysToKeep)
+      .mapKeys((value, key) => `${this.prefix}-${key}`)
+      .value()
+  }
+}
+
+const videoKeysToKeep = [
+  'tags',
+  'uuid',
+  'id',
+  'uuid',
+  'createdAt',
+  'updatedAt',
+  'publishedAt',
+  'category',
+  'licence',
+  'language',
+  'privacy',
+  'description',
+  'duration',
+  'isLocal',
+  'name',
+  'thumbnailPath',
+  'previewPath',
+  'nsfw',
+  'waitTranscoding',
+  'account-id',
+  'account-uuid',
+  'account-name',
+  'channel-id',
+  'channel-uuid',
+  'channel-name',
+  'support',
+  'commentsEnabled'
+]
+class VideoAuditView extends AuditEntity {
+  constructor (private video: VideoDetails) {
+    super(videoKeysToKeep, 'video', video)
+  }
+}
+
+export {
+  auditLoggerFactory,
+  VideoAuditView
+}
diff --git a/server/helpers/logger.ts b/server/helpers/logger.ts
index 6d369a8fb..04a19a9c6 100644
--- a/server/helpers/logger.ts
+++ b/server/helpers/logger.ts
@@ -96,13 +96,13 @@ const bunyanLogger = {
   error: bunyanLogFactory('error'),
   fatal: bunyanLogFactory('error')
 }
-
 // ---------------------------------------------------------------------------
 
 export {
   timestampFormatter,
   labelFormatter,
   consoleLoggerFormat,
+  jsonLoggerFormat,
   logger,
   bunyanLogger
 }