Промежуточный коммит, загрузка и обработка файла книги

server/core/FileDetector.js

@@ -0,0 +1,57 @@
+const detect = require('detect-file-type');
+
+//html
+detect.addSignature(
+  {
+    "type": "html",
+    "ext": "html",
+    "mime": "text/html",
+    "rules": [
+      { "type": "or", "rules":
+      [
+        { "type": "contains", "bytes": "3c68746d6c" },
+        { "type": "contains", "bytes": "3c00680074006d006c00" },
+
+        { "type": "contains", "bytes": "3c21646f6374797065" },
+        { "type": "contains", "bytes": "3c626f6479" },
+        { "type": "contains", "bytes": "3c68656164" },
+        { "type": "contains", "bytes": "3c696672616d65" },
+        { "type": "contains", "bytes": "3c696d67" },
+        { "type": "contains", "bytes": "3c6f626a656374" },
+        { "type": "contains", "bytes": "3c736372697074" },
+        { "type": "contains", "bytes": "3c7461626c65" },
+        { "type": "contains", "bytes": "3c7469746c65" },
+      ]
+      }
+    ]
+  }
+);
+
+//xml 3c 3f 78 6d 6c 20 76 65 72 73 69 6f 6e 3d 22 31 2e 30 22
+detect.addSignature(
+  {
+    "type": "xml",
+    "ext": "xml",
+    "mime": "application/xml",
+    "rules": [
+      { "type": "or", "rules":
+      [
+        { "type": "contains", "bytes": "3c3f786d6c2076657273696f6e3d22312e3022" },
+      ]
+      }
+    ]
+  }
+);
+
+class FileDetector {
+    detectFile(filename) {
+        return new Promise((resolve, reject) => {
+            detect.fromFile(filename, (err, result) => {
+                if (err) reject(err);
+                resolve(result);
+            });
+        });
+    }
+}
+
+module.exports = FileDetector;