feat(identity): add resend otp delivery adapter

2026-07-21 17:28:59 +08:00
parent 5da3dd38ff
commit 43213f080a
3 changed files with 198 additions and 0 deletions
@@ -0,0 +1,12 @@
+import type {
+  EmailOtpMessage,
+  EmailOtpSender,
+} from "../contracts.ts";
+
+export class FakeEmailOtpSender implements EmailOtpSender {
+  readonly messages: EmailOtpMessage[] = [];
+
+  async send(message: EmailOtpMessage): Promise<void> {
+    this.messages.push({ ...message });
+  }
+}
@@ -0,0 +1,73 @@
+import type {
+  EmailOtpMessage,
+  EmailOtpSender,
+  EmailOtpType,
+} from "../contracts.ts";
+
+const resendEndpoint = "https://api.resend.com/emails";
+const safeDeliveryError = "OTP email delivery failed";
+
+const subjectByType: Record<EmailOtpType, string> = {
+  "sign-in": "Your Jyotisha sign-in code",
+  "email-verification": "Verify your Jyotisha email",
+  "forget-password": "Reset your Jyotisha password",
+};
+
+function escapeHtml(value: string): string {
+  return value.replace(/[&<>"']/g, (character) => {
+    const entities: Record<string, string> = {
+      "&": "&amp;",
+      "<": "&lt;",
+      ">": "&gt;",
+      '"': "&quot;",
+      "'": "&#39;",
+    };
+    return entities[character];
+  });
+}
+
+export interface ResendEmailOtpSenderOptions {
+  apiKey: string;
+  from: string;
+  fetchImpl?: typeof fetch;
+}
+
+export class ResendEmailOtpSender implements EmailOtpSender {
+  private readonly apiKey: string;
+  private readonly from: string;
+  private readonly fetchImpl: typeof fetch;
+
+  constructor(options: ResendEmailOtpSenderOptions) {
+    this.apiKey = options.apiKey;
+    this.from = options.from;
+    this.fetchImpl = options.fetchImpl ?? fetch;
+  }
+
+  async send(message: EmailOtpMessage): Promise<void> {
+    const escapedOtp = escapeHtml(message.otp);
+    const subject = subjectByType[message.type];
+
+    try {
+      const response = await this.fetchImpl(resendEndpoint, {
+        method: "POST",
+        headers: {
+          Authorization: `Bearer ${this.apiKey}`,
+          "Content-Type": "application/json",
+          "Idempotency-Key": message.idempotencyKey,
+          "User-Agent": "jyotisha-identity/1.0",
+        },
+        body: JSON.stringify({
+          from: this.from,
+          to: [message.email],
+          subject,
+          text: `${subject}: ${message.otp}. This code expires in five minutes.`,
+          html: `<p>${escapeHtml(subject)}</p><p><strong>${escapedOtp}</strong></p><p>This code expires in five minutes.</p>`,
+        }),
+      });
+
+      if (!response.ok) throw new Error(safeDeliveryError);
+    } catch {
+      throw new Error(safeDeliveryError);
+    }
+  }
+}