base64 support, ApiJson, Eval string inputs

src/nodes/Base64ToImg.ts

@@ -0,0 +1,84 @@
+import {
+  ImageVar,
+  NumberVar,
+  StringVar,
+} from './io/AbstractIOSet';
+import Node from './Node';
+import {canvasPool2D} from '../canvas/CanvasPool';
+
+const inputs = {
+  base64: {
+    type: 'String',
+  } as StringVar,
+};
+
+const outputs = {
+  image: {
+    type: 'Image',
+  } as ImageVar,
+  width: {
+    type: 'Number',
+  } as NumberVar,
+  height: {
+    type: 'Number',
+  } as NumberVar,
+};
+
+/**
+ * TODO: after successful tests move this to the library
+ */
+export default class Base64ToImg extends Node<typeof inputs, typeof outputs> {
+  constructor(options = {}) {
+    super('Base64ToImg', inputs, outputs);
+  }
+
+  async _update() {
+    let base64String = this.in.base64.value;
+
+    if (!base64String) {
+      return;
+    }
+
+    if (!base64String.startsWith('data:image/')) {
+      base64String = `data:${this.estimateImageMimeType(base64String)};base64,${base64String}`;
+    }
+
+    const canvas = canvasPool2D.createCanvas();
+    canvas.acquire();
+
+    await new Promise((resolve, reject) => {
+      const img = new Image();
+      img.onload = () => {
+        canvas.width = img.width;
+        canvas.height = img.height;
+        const canvasContext = canvas.getContext('2d');
+        canvasContext.drawImage(img, 0, 0);
+        resolve(img);
+      };
+
+      img.onerror = (e) => {
+        reject(new Error(e as string));
+      };
+
+      img.src = base64String;
+    });
+
+    this.out.image.value = canvas;
+    this.out.width.value = canvas.width;
+    this.out.height.value = canvas.height;
+  }
+
+  private estimateImageMimeType(base64String: string): string {
+    // Attempt to estimate the MIME type based on base64 signature.
+    if (base64String.startsWith('iVBORw0KGgo=')) {
+      return 'image/png';
+    } else if (base64String.startsWith('/9j/')) {
+      return 'image/jpeg';
+    } else if (base64String.startsWith('UklGR')) {
+      return 'image/webp';
+    } else {
+      // Default or unknown type
+      return 'application/octet-stream';
+    }
+  }
+}