Plugins: Add support for read and writing text, HTML and images from/to clipboard

packages/lib/services/plugins/api/JoplinClipboard.ts

@@ -0,0 +1,45 @@
+const { clipboard, nativeImage } = require('electron');
+
+export default class JoplinClipboard {
+
+	public async readText(): Promise<string> {
+		return clipboard.readText();
+	}
+
+	public async writeText(text: string): Promise<void> {
+		clipboard.writeText(text);
+	}
+
+	public async readHtml(): Promise<string> {
+		return clipboard.readHTML();
+	}
+
+	public async writeHtml(html: string): Promise<void> {
+		clipboard.writeHTML(html);
+	}
+
+	/**
+	 * Returns the image in [data URL](https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs) format.
+	 */
+	public async readImage(): Promise<string> {
+		const image = clipboard.readImage();
+		return image ? image.toDataURL() : '';
+	}
+
+	/**
+	 * Takes an image in [data URL](https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs) format.
+	 */
+	public async writeImage(dataUrl: string): Promise<void> {
+		clipboard.writeImage(nativeImage.createFromDataURL(dataUrl));
+	}
+
+	/**
+	 * Returns the list available formats (mime types).
+	 *
+	 * For example [ 'text/plain', 'text/html' ]
+	 */
+	public async availableFormats(): Promise<string[]> {
+		return clipboard.availableFormats();
+	}
+
+}