forked from MapComplete/MapComplete
33 lines
No EOL
1.1 KiB
TypeScript
33 lines
No EOL
1.1 KiB
TypeScript
import {UIEventSource} from "../UIEventSource";
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import {LicenseInfo} from "./Wikimedia";
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import BaseUIElement from "../../UI/BaseUIElement";
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export default abstract class ImageAttributionSource {
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private _cache = new Map<string, UIEventSource<LicenseInfo>>()
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GetAttributionFor(url: string): UIEventSource<LicenseInfo> {
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const cached = this._cache.get(url);
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if (cached !== undefined) {
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return cached;
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}
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const src = new UIEventSource(undefined)
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this._cache.set(url, src)
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this.DownloadAttribution(url).then(license =>
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src.setData(license))
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.catch(e => console.error("Could not download license information for ", url, " due to", e))
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return src;
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}
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public abstract SourceIcon(backlinkSource?: string): BaseUIElement;
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/*Converts a value to a URL. Can return null if not applicable*/
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public PrepareUrl(value: string): string | UIEventSource<string> {
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return value;
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}
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protected abstract DownloadAttribution(url: string): Promise<LicenseInfo>;
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} |