fix: use jump host SOCKS proxy settings (#1116)

src/backend/hosts/jump-host-proxy.test.ts

@@ -0,0 +1,53 @@
+import { describe, expect, it } from "vitest";
+import { getJumpHostSocks5Config } from "./jump-host-proxy.js";
+
+describe("getJumpHostSocks5Config", () => {
+  it("uses the first jump host proxy settings", () => {
+    expect(
+      getJumpHostSocks5Config({
+        useSocks5: true,
+        socks5Host: "proxy.internal",
+        socks5Port: 1080,
+        socks5Username: "user",
+        socks5Password: "secret",
+      }),
+    ).toEqual({
+      useSocks5: true,
+      socks5Host: "proxy.internal",
+      socks5Port: 1080,
+      socks5Username: "user",
+      socks5Password: "secret",
+      socks5ProxyChain: [],
+    });
+  });
+
+  it("does not use destination proxy settings for the first jump host", () => {
+    expect(getJumpHostSocks5Config({ useSocks5: false })).toBeNull();
+  });
+
+  it("accepts a serialized proxy chain from the first jump host", () => {
+    const chain = [
+      {
+        id: "proxy-1",
+        name: "Proxy 1",
+        host: "proxy.internal",
+        port: 1080,
+        type: "socks5" as const,
+      },
+    ];
+
+    expect(
+      getJumpHostSocks5Config({
+        useSocks5: true,
+        socks5ProxyChain: JSON.stringify(chain),
+      }),
+    ).toEqual({
+      useSocks5: true,
+      socks5Host: undefined,
+      socks5Port: undefined,
+      socks5Username: undefined,
+      socks5Password: undefined,
+      socks5ProxyChain: chain,
+    });
+  });
+});