Liquid icons api

backend/src/api/liquid/icons.ts

@@ -0,0 +1,39 @@
+import * as fs from 'fs';
+import config from '../../config';
+import logger from '../../logger';
+
+class Icons {
+  private static FILE_NAME = './icons.json';
+  private iconIds: string[] = [];
+  private icons: { [assetId: string]: string; } = {};
+  constructor() {
+    if (config.MEMPOOL.NETWORK !== 'liquid') {
+      return;
+    }
+    if (!fs.existsSync(Icons.FILE_NAME)) {
+      logger.warn(`${Icons.FILE_NAME} does not exist. No Liquid icons loaded.`);
+      return;
+    }
+    const cacheData = fs.readFileSync(Icons.FILE_NAME, 'utf8');
+    this.icons = JSON.parse(cacheData);
+
+    for (const i in this.icons) {
+      this.iconIds.push(i);
+    }
+    logger.debug(`Liquid icons has been loaded.`);
+  }
+
+  public getIconByAssetId(assetId: string): Buffer | undefined {
+    const icon = this.icons[assetId];
+    if (icon) {
+      return Buffer.from(icon, 'base64');
+    }
+  }
+
+  public getAllIconIds() {
+    return this.iconIds;
+  }
+
+}
+
+export default new Icons();