feat(metadata): implement MetadataRequest and supporting classes for file metadata extraction and response formatting

scripts/file-management/analyze.js

@@ -0,0 +1,35 @@
+const MetadataExtractor = class {
+	/* 
+	 * MetadataExtractor class
+	 * This class is used to extract metadata from a BLOB object.
+	*/
+	constructor(BLOB) {
+		this.blob = BLOB;
+
+		this.extract([`fieldname`, `encoding`, `originalname`, `mimetype`, `size`]);
+	}
+
+	/* 
+	 * Extract data from the blob. 
+	*/
+	extract(FIELDS) {
+		// Verify the validity of the blob.
+		if (!this.blob) {
+			throw new Error("Invalid BLOB object");
+		};
+
+		// Extract the relevant fields. 
+		let RESPONSE = {};
+		FIELDS.forEach((FIELD) => {
+			if (!(this.blob[FIELD] === undefined)) {
+				this[FIELD] = this.blob[FIELD];
+				RESPONSE[FIELD] = this.blob[FIELD];
+			}
+		});
+
+		// Return the response.
+		return (RESPONSE);
+	}
+}
+
+module.exports = MetadataExtractor;