browser/libs/common/src/emailForwarders/fastmailForwarder.ts

import { ApiService } from "../abstractions/api.service";

import { Forwarder } from "./forwarder";
import { ForwarderOptions } from "./forwarderOptions";

export class FastmailForwarder implements Forwarder {
  async generate(apiService: ApiService, options: ForwarderOptions): Promise<string> {
    if (options.apiKey == null || options.apiKey === "") {
      throw "Invalid Fastmail API token.";
    }
    if (options?.fastmail.accountId == null || options.fastmail.accountId === "") {
      throw "Invalid Fastmail account ID.";
    }
    const requestInit: RequestInit = {
      redirect: "manual",
      cache: "no-store",
      method: "POST",
      headers: new Headers({
        Authorization: "Bearer " + options.apiKey,
        "Content-Type": "application/json",
      }),
    };
    const url = "https://api.fastmail.com/jmap/api/";
    requestInit.body = JSON.stringify({
      using: ["https://www.fastmail.com/dev/maskedemail", "urn:ietf:params:jmap:core"],
      methodCalls: [
        [
          "MaskedEmail/set",
          {
            accountId: "u" + options.fastmail.accountId,
            create: {
              "new-masked-email": {
                state: "enabled",
                description:
                  (options.website != null ? options.website + " - " : "") +
                  "Generated by Bitwarden",
                url: options.website,
                emailPrefix: options.fastmail.prefix,
              },
            },
          },
          "0",
        ],
      ],
    });
    const request = new Request(url, requestInit);
    const response = await apiService.nativeFetch(request);
    if (response.status === 200) {
      const json = await response.json();
      if (
        json.methodResponses != null &&
        json.methodResponses.length > 0 &&
        json.methodResponses[0].length > 0
      ) {
        if (json.methodResponses[0][0] === "MaskedEmail/set") {
          return json.methodResponses[0][1]?.created?.["new-masked-email"]?.email;
        } else if (json.methodResponses[0][0] === "error") {
          throw "Fastmail error: " + json.methodResponses[0][1]?.description;
        }
      }
    }
    if (response.status === 401) {
      throw "Invalid Fastmail API token.";
    }
    throw "Unknown Fastmail error occurred.";
  }
}