feat: add config expander and Mihomo config builder

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/tests/test_expander.py

@@ -0,0 +1,151 @@
+import yaml
+from expander import filter_proxy, expand_config, build_mihomo_config
+
+PROXY_FULL = {
+    "name": "node1",
+    "type": "ss",
+    "server": "1.2.3.4",
+    "port": 443,
+    "password": "secret",
+    "cipher": "aes-256-gcm",
+    "alive": True,           # runtime field — should be stripped
+    "history": [],           # runtime field — should be stripped
+    "extra": {"foo": "bar"}, # runtime field — should be stripped
+}
+
+BASE_YAML = """
+proxies: []
+proxy-providers:
+  provider1:
+    type: http
+    url: https://example.com/sub
+    interval: 3600
+proxy-groups:
+  - name: Proxy
+    type: select
+    use:
+      - provider1
+rules:
+  - MATCH,DIRECT
+"""
+
+
+def test_filter_proxy_removes_runtime_fields():
+    filtered = filter_proxy(PROXY_FULL)
+    assert "alive" not in filtered
+    assert "history" not in filtered
+    assert "extra" not in filtered
+    assert filtered["name"] == "node1"
+    assert filtered["server"] == "1.2.3.4"
+
+
+def test_expand_config_replaces_providers_with_proxies():
+    proxies = [
+        {"name": "node1", "type": "ss", "server": "1.2.3.4", "port": 443,
+         "password": "pwd", "cipher": "aes-256-gcm"},
+    ]
+    result = expand_config(BASE_YAML, {"provider1": proxies})
+    cfg = yaml.safe_load(result)
+
+    assert "proxy-providers" not in cfg
+    assert any(p["name"] == "node1" for p in cfg["proxies"])
+
+
+def test_expand_config_fills_use_in_proxy_groups():
+    proxies = [
+        {"name": "node1", "type": "ss", "server": "1.2.3.4", "port": 443,
+         "password": "pwd", "cipher": "aes-256-gcm"},
+        {"name": "node2", "type": "ss", "server": "5.6.7.8", "port": 443,
+         "password": "pwd", "cipher": "aes-256-gcm"},
+    ]
+    result = expand_config(BASE_YAML, {"provider1": proxies})
+    cfg = yaml.safe_load(result)
+
+    proxy_group = next(g for g in cfg["proxy-groups"] if g["name"] == "Proxy")
+    assert "use" not in proxy_group
+    assert "node1" in proxy_group["proxies"]
+    assert "node2" in proxy_group["proxies"]
+
+
+def test_expand_config_preserves_existing_proxies():
+    base = """
+proxies:
+  - name: static-node
+    type: direct
+proxy-providers:
+  p1:
+    type: http
+    url: https://example.com/sub
+    interval: 3600
+proxy-groups: []
+rules: []
+"""
+    result = expand_config(base, {"p1": [{"name": "dynamic-node", "type": "ss",
+                                           "server": "1.2.3.4", "port": 443}]})
+    cfg = yaml.safe_load(result)
+    names = [p["name"] for p in cfg["proxies"]]
+    assert "static-node" in names
+    assert "dynamic-node" in names
+
+
+def test_expand_config_empty_providers():
+    result = expand_config(BASE_YAML, {})
+    cfg = yaml.safe_load(result)
+    assert "proxy-providers" not in cfg
+
+
+def test_build_mihomo_config_merges_providers():
+    yaml1 = """
+proxy-providers:
+  p1:
+    type: http
+    url: https://a.example.com/sub
+    interval: 3600
+    health-check:
+      enable: true
+      url: http://www.gstatic.com/generate_204
+      interval: 300
+"""
+    yaml2 = """
+proxy-providers:
+  p2:
+    type: http
+    url: https://b.example.com/sub
+    interval: 3600
+"""
+    result = build_mihomo_config([yaml1, yaml2], "mysecret")
+    cfg = yaml.safe_load(result)
+
+    assert cfg["external-controller"] == "0.0.0.0:9090"
+    assert cfg["secret"] == "mysecret"
+    assert cfg["mixed-port"] == 7890
+    assert cfg["allow-lan"] is False
+    assert "p1" in cfg["proxy-providers"]
+    assert "p2" in cfg["proxy-providers"]
+    assert cfg["proxy-providers"]["p1"]["health-check"]["enable"] is True
+
+
+def test_build_mihomo_config_deduplicates_by_name():
+    yaml1 = """
+proxy-providers:
+  p1:
+    type: http
+    url: https://original.example.com/sub
+    interval: 3600
+"""
+    yaml2 = """
+proxy-providers:
+  p1:
+    type: http
+    url: https://duplicate.example.com/sub
+    interval: 3600
+"""
+    result = build_mihomo_config([yaml1, yaml2], "s")
+    cfg = yaml.safe_load(result)
+    assert cfg["proxy-providers"]["p1"]["url"] == "https://original.example.com/sub"
+
+
+def test_build_mihomo_config_no_providers():
+    result = build_mihomo_config(["proxies: []"], "s")
+    cfg = yaml.safe_load(result)
+    assert "proxy-providers" not in cfg