add whatsapp modules

src/common/errors/whatsapp.error.ts

@@ -0,0 +1,5 @@
+export class WhatsAppError extends Error {
+	public constructor(message: string) {
+		super(message);
+	}
+}

src/common/services/whatsapp-service/abstract.whatsapp-service.ts

@@ -0,0 +1,3 @@
+export abstract class AbstractWhatsAppService {
+	public abstract sendMessage(to: string, message: string): Promise<void>;
+}

src/common/services/whatsapp-service/meta.whatsapp-service.ts

@@ -0,0 +1,29 @@
+import { WhatsAppError } from "@/common/errors/whatsapp.error";
+import { AbstractWhatsAppService } from "@/common/services/whatsapp-service/abstract.whatsapp-service";
+import { whatsAppBusinessConfig } from "@/configs/whatsapp-business.config";
+
+export class MetaWhatsAppService extends AbstractWhatsAppService {
+	public async sendMessage(to: string, message: string): Promise<void> {
+		const response = await fetch(
+			`https://graph.facebook.com/v22.0/${whatsAppBusinessConfig.phoneNumberId}/messages`,
+			{
+				method: "POST",
+				headers: {
+					Authorization: `Bearer ${whatsAppBusinessConfig.accessToken}`,
+					"Content-Type": "application/json",
+				},
+				body: JSON.stringify({
+					messaging_product: "whatsapp",
+					to,
+					type: "text",
+					text: { body: message },
+				}),
+			},
+		);
+
+		if (!response.ok) {
+			console.error(await response.json());
+			throw new WhatsAppError("Failed to send WhatsApp message");
+		}
+	}
+}

src/common/utils.ts

@@ -1,10 +1,8 @@
-export function generateRandomCode(length: number): string {
-	const numbers = "0123456789";
-
+export function generateRandomCode(length: number, characters: string): string {
 	let result = "";
 	for (let i = 0; i < length; i++) {
-		const randomIndex = Math.floor(Math.random() * numbers.length);
-		result += numbers[randomIndex];
+		const randomIndex = Math.floor(Math.random() * characters.length);
+		result += characters[randomIndex];
 	}
 
 	return result;