Add NFO metadata source

server/scanner/NfoFileScanner.js

@@ -0,0 +1,48 @@
+const { parseNfoMetadata } = require('../utils/parsers/parseNfoMetadata')
+const { readTextFile } = require('../utils/fileUtils')
+
+class NfoFileScanner {
+  constructor() { }
+
+  /**
+   * Parse metadata from .nfo file found in library scan and update bookMetadata
+   * 
+   * @param {import('../models/LibraryItem').LibraryFileObject} nfoLibraryFileObj 
+   * @param {Object} bookMetadata 
+   */
+  async scanBookNfoFile(nfoLibraryFileObj, bookMetadata) {
+    const nfoText = await readTextFile(nfoLibraryFileObj.metadata.path)
+    const nfoMetadata = nfoText ? await parseNfoMetadata(nfoText) : null
+    if (nfoMetadata) {
+      for (const key in nfoMetadata) {
+        if (key === 'tags') { // Add tags only if tags are empty
+          if (nfoMetadata.tags.length) {
+            bookMetadata.tags = nfoMetadata.tags
+          }
+        } else if (key === 'genres') { // Add genres only if genres are empty
+          if (nfoMetadata.genres.length) {
+            bookMetadata.genres = nfoMetadata.genres
+          }
+        } else if (key === 'authors') {
+          if (nfoMetadata.authors?.length) {
+            bookMetadata.authors = nfoMetadata.authors
+          }
+        } else if (key === 'narrators') {
+          if (nfoMetadata.narrators?.length) {
+            bookMetadata.narrators = nfoMetadata.narrators
+          }
+        } else if (key === 'series') {
+          if (nfoMetadata.series) {
+            bookMetadata.series = [{
+              name: nfoMetadata.series,
+              sequence: nfoMetadata.sequence || null
+            }]
+          }
+        } else if (nfoMetadata[key] && key !== 'sequence') {
+          bookMetadata[key] = nfoMetadata[key]
+        }
+      }
+    }
+  }
+}
+module.exports = new NfoFileScanner()