Move imageAttributionSources around, improve fixTheme script

Logic/ImageProviders/ImgurUploader.ts

@@ -0,0 +1,41 @@
+import {UIEventSource} from "../UIEventSource";
+import {Imgur} from "./Imgur";
+
+export default class ImgurUploader {
+
+    public readonly queue: UIEventSource<string[]> = new UIEventSource<string[]>([]);
+    public readonly failed: UIEventSource<string[]> = new UIEventSource<string[]>([]);
+    public readonly success: UIEventSource<string[]> = new UIEventSource<string[]>([]);
+    private readonly _handleSuccessUrl: (string) => void;
+
+    constructor(handleSuccessUrl: (string) => void) {
+        this._handleSuccessUrl = handleSuccessUrl;
+    }
+
+    public uploadMany(title: string, description: string, files: FileList) {
+        for (let i = 0; i < files.length; i++) {
+            this.queue.data.push(files.item(i).name)
+        }
+        this.queue.ping()
+
+        const self = this;
+        this.queue.setData([...self.queue.data])
+        Imgur.uploadMultiple(title,
+            description,
+            files,
+            function (url) {
+                console.log("File saved at", url);
+                self.success.setData([...self.success.data, url]);
+                self._handleSuccessUrl(url);
+            },
+            function () {
+                console.log("All uploads completed");
+            },
+
+            function (failReason) {
+                console.log("Upload failed due to ", failReason)
+                self.failed.setData([...self.failed.data, failReason])
+            }
+        );
+    }
+}