Made base class for metadata readers that deal with zip

package-lock.json

@@ -4140,6 +4140,11 @@
       "integrity": "sha512-9/IECtNr8dXNmPWmFXepT0/7o5eolGesHUa3mtr0KlgnCvnZxwh2qensKL42JJY2vQKC3nIBXetFAqR+PW1CmA==",
       "dev": true
     },
+    "node-stream-zip": {
+      "version": "1.15.0",
+      "resolved": "https://registry.npmjs.org/node-stream-zip/-/node-stream-zip-1.15.0.tgz",
+      "integrity": "sha512-LN4fydt9TqhZhThkZIVQnF9cwjU3qmUH9h78Mx/K7d3VvfRqqwthLwJEUOEL0QPZ0XQmNN7be5Ggit5+4dq3Bw=="
+    },
     "normalize-path": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/normalize-path/-/normalize-path-3.0.0.tgz",

package.json

@@ -43,6 +43,7 @@
     "@actions/github": "^5.0.0",
     "fast-glob": "^3.2.7",
     "formdata-node": "^4.2.4",
-    "node-fetch": "^3.0.0"
+    "node-fetch": "^3.0.0",
+    "node-stream-zip": "^1.15.0"
   }
 }

src/metadata/zipped-mod-metadata-reader.ts

@@ -0,0 +1,32 @@
+import ModMetadata from "./mod-metadata";
+import ModMetadataReader from "./mod-metadata-reader";
+import { StreamZipAsync, async as ZipArchive } from "node-stream-zip";
+
+export default abstract class ZippedModMetadataReader<TConfig = Record<string, unknown>> implements ModMetadataReader {
+    private configEntryName: string;
+
+    protected constructor(configEntryName: string) {
+        this.configEntryName = configEntryName;
+    }
+
+    async readMetadata(modPath: string): Promise<ModMetadata | null> {
+        let zip = <StreamZipAsync>null;
+        try {
+            zip = new ZipArchive({ file: modPath });
+            const buffer = await zip.entryData(this.configEntryName).catch(_ => <Buffer>null);
+            if (buffer) {
+                return this.createMetadataFromConfig(this.loadConfig(buffer));
+            } else {
+                return null;
+            }
+        } catch {
+            return null;
+        } finally {
+            await zip?.close();
+        }
+    }
+
+    protected abstract loadConfig(buffer: Buffer): TConfig;
+
+    protected abstract createMetadataFromConfig(config: TConfig): ModMetadata;
+}