Setup Alpaca API implementation

src/alpaca/portfolio.ts

@@ -0,0 +1,45 @@
+import Alpaca from '@alpacahq/alpaca-trade-api'
+import { PortfolioProvider, Portfolio, Position } from '../interface/portfolio';
+
+class AlpacaPosition {
+    asset_id!: string;
+    symbol!: string;
+    exchange!: string;
+    asset_class!: string;
+    avg_entry_price!: string;
+    qty!: string;
+    qty_available!: string;
+    side!: string;
+    market_value!: string;
+    cost_basis!: string;
+    unrealized_pl!: string;
+    unrealized_plpc!: string;
+    unrealized_intraday_pl!: string;
+    unrealized_intraday_plpc!: string;
+    current_price!: string;
+    lastday_price!: string;
+    change_today!: string;
+    asset_marginable!: string;
+}
+
+export class AlpacaPortfolioProvider implements PortfolioProvider {
+    readonly alpaca: Alpaca;
+
+    readonly fetchPortfolio = (): Promise<Portfolio> => {
+        return (this.alpaca.getPositions() as Promise<AlpacaPosition[]>).then((positions) => {
+            return new Portfolio(positions.map((position) => {
+                return new Position(
+                    position.symbol,
+                    parseInt(position.qty, 10),
+                    parseFloat(position.market_value),
+                    parseFloat(position.cost_basis),
+                    parseFloat(position.market_value)
+                );
+            }));
+        });
+    }
+
+    constructor(alpaca: Alpaca) {
+        this.alpaca = alpaca;
+    }
+}