Refactoring of image detection, fix loading wikimedia images

Logic/ImageProviders/GenericImageProvider.ts

@@ -0,0 +1,36 @@
+import ImageProvider, {ProvidedImage} from "./ImageProvider";
+
+export default class GenericImageProvider extends ImageProvider {
+    public defaultKeyPrefixes: string[] = ["image"];
+
+    private readonly _valuePrefixBlacklist: string[];
+
+    public constructor(valuePrefixBlacklist: string[]) {
+        super();
+        this._valuePrefixBlacklist = valuePrefixBlacklist;
+    }
+
+
+    protected DownloadAttribution(url: string) {
+        return undefined
+    }
+
+    async ExtractUrls(key: string, value: string): Promise<Promise<ProvidedImage>[]> {
+
+        if (this._valuePrefixBlacklist.some(prefix => value.startsWith(prefix))) {
+            return []
+        }
+
+        return [Promise.resolve({
+            key: key,
+            url: value,
+            provider: this
+        })]
+    }
+
+    SourceIcon(backlinkSource?: string) {
+        return undefined;
+    }
+
+
+}