Add:Generate book metadata file when book details are changed,Add:Server setting for storing book metadata in book folder

server/Db.js

@@ -124,8 +124,8 @@ class Db {
     if (!this.serverSettings) {
       this.serverSettings = new ServerSettings()
       await this.insertEntity('settings', this.serverSettings)
-      global.ServerSettings = this.serverSettings.toJSON()
     }
+    global.ServerSettings = this.serverSettings.toJSON()
   }
 
   async load() {
@@ -311,5 +311,12 @@ class Db {
       return []
     })
   }
+
+  // Check if server was updated and previous version was earlier than param
+  checkPreviousVersionIsBefore(version) {
+    if (!this.previousVersion) return false
+    // true if version > previousVersion
+    return version.localeCompare(this.previousVersion) >= 0
+  }
 }
 module.exports = Db

server/Server.js

@@ -35,6 +35,8 @@ class Server {
     this.Uid = isNaN(UID) ? 0 : Number(UID)
     this.Gid = isNaN(GID) ? 0 : Number(GID)
     this.Host = '0.0.0.0'
+    global.Uid = this.Uid
+    global.Gid = this.Gid
     global.ConfigPath = Path.normalize(CONFIG_PATH)
     global.AudiobookPath = Path.normalize(AUDIOBOOK_PATH)
     global.MetadataPath = Path.normalize(METADATA_PATH)
@@ -132,6 +134,10 @@ class Server {
       Logger.info(`[Server] Running scan for duplicate book IDs`)
       await this.scanner.fixDuplicateIds()
     }
+    // If server upgrade and last version was 1.7.0 or earlier - add abmetadata files
+    // if (this.db.checkPreviousVersionIsBefore('1.7.1')) {
+    // TODO: wait until stable
+    // }
 
     if (this.db.serverSettings.scannerDisableWatcher) {
       Logger.info(`[Server] Watcher is disabled`)

server/objects/Audiobook.js

@@ -5,6 +5,7 @@ const { comparePaths, getIno, getId, elapsedPretty } = require('../utils/index')
 const { parseOpfMetadataXML } = require('../utils/parseOpfMetadata')
 const { extractCoverArt } = require('../utils/ffmpegHelpers')
 const nfoGenerator = require('../utils/nfoGenerator')
+const abmetadataGenerator = require('../utils/abmetadataGenerator')
 const Logger = require('../Logger')
 const Book = require('./Book')
 const AudioTrack = require('./AudioTrack')
@@ -44,6 +45,9 @@ class Audiobook {
     if (audiobook) {
       this.construct(audiobook)
     }
+
+    // Temp flags
+    this.isSavingMetadata = false
   }
 
   construct(audiobook) {
@@ -424,6 +428,10 @@ class Audiobook {
 
     if (payload.book && this.book.update(payload.book)) {
       hasUpdates = true
+
+      // TODO: Book may have updates where this save is not necessary
+      //          add check first if metadata update is needed
+      this.saveAbMetadata()
     }
 
     if (hasUpdates) {
@@ -1025,5 +1033,25 @@ class Audiobook {
     }
     return false
   }
+
+  async saveAbMetadata() {
+    if (this.isSavingMetadata) return
+    this.isSavingMetadata = true
+
+    var metadataPath = Path.join(global.MetadataPath, 'books', this.id)
+    if (global.ServerSettings.storeMetadataWithBook) {
+      metadataPath = this.fullPath
+    } else {
+      // Make sure metadata book dir exists
+      await fs.ensureDir(metadataPath)
+    }
+    metadataPath = Path.join(metadataPath, 'metadata.abs')
+
+    return abmetadataGenerator.generate(this, metadataPath).then((success) => {
+      if (!success) Logger.error(`[Audiobook] Failed saving abmetadata to "${metadataPath}"`)
+      else Logger.debug(`[Audiobook] Success saving abmetadata to "${metadataPath}"`)
+      return success
+    })
+  }
 }
 module.exports = Audiobook

server/utils/abmetadataGenerator.js

@@ -19,7 +19,7 @@ const bookKeyMap = {
   genres: 'genresCommaSeparated'
 }
 
-function generate(audiobook, outputPath, uid, gid) {
+function generate(audiobook, outputPath) {
   var fileString = ';ABMETADATA1\n'
   fileString += `#audiobookshelf v${package.version}\n\n`
 
@@ -39,7 +39,7 @@ function generate(audiobook, outputPath, uid, gid) {
   }
 
   return fs.writeFile(outputPath, fileString).then(() => {
-    return filePerms(outputPath, 0o774, uid, gid).then(() => true)
+    return filePerms(outputPath, 0o774, global.Uid, global.Gid).then(() => true)
   }).catch((error) => {
     Logger.error(`[absMetaFileGenerator] Failed to save abs file`, error)
     return false