Geodata: Support automatically updating .dat files and hot reloading (#5992)

https://github.com/XTLS/Xray-core/pull/5992#issuecomment-4320551920

Usage: https://github.com/XTLS/Xray-core/pull/5992#issuecomment-4291168039

infra/conf/geodata_test.go

@@ -0,0 +1,75 @@
+package conf_test
+
+import (
+	"path/filepath"
+	"testing"
+
+	"github.com/xtls/xray-core/app/geodata"
+	. "github.com/xtls/xray-core/infra/conf"
+)
+
+func TestGeodataConfig(t *testing.T) {
+	t.Setenv("xray.location.asset", filepath.Join("..", "..", "resources"))
+
+	creator := func() Buildable {
+		return new(GeodataConfig)
+	}
+
+	runMultiTestCase(t, []TestCase{
+		{
+			Input: `{
+				"cron": "0 4 * * *",
+				"outbound": "proxy",
+				"assets": [
+					{"url": "https://example.com/geoip.dat", "file": "geoip.dat"},
+					{"url": "https://example.com/geosite.dat", "file": "geosite.dat"}
+				]
+			}`,
+			Parser: loadJSON(creator),
+			Output: &geodata.Config{
+				Cron:     "0 4 * * *",
+				Outbound: "proxy",
+				Assets: []*geodata.Asset{
+					{Url: "https://example.com/geoip.dat", File: "geoip.dat"},
+					{Url: "https://example.com/geosite.dat", File: "geosite.dat"},
+				},
+			},
+		},
+	})
+}
+
+func TestGeodataAssetConfig(t *testing.T) {
+	t.Setenv("xray.location.asset", filepath.Join("..", "..", "resources"))
+
+	if _, err := (&GeodataAssetConfig{
+		URL:  "https://example.com/geoip.dat",
+		File: "geoip.dat",
+	}).Build(); err != nil {
+		t.Fatal(err)
+	}
+
+	if _, err := (&GeodataAssetConfig{
+		URL:  "https://example.com/geoip.dat",
+		File: "missing.dat",
+	}).Build(); err == nil {
+		t.Fatal("expected error")
+	}
+}
+
+func TestGeodataAssetConfigInvalidURL(t *testing.T) {
+	t.Setenv("xray.location.asset", filepath.Join("..", "..", "resources"))
+
+	for _, rawURL := range []string{
+		"",
+		"http://example.com/geoip.dat",
+		"ftp://example.com/geoip.dat",
+		"https:///geoip.dat",
+	} {
+		if _, err := (&GeodataAssetConfig{
+			URL:  rawURL,
+			File: "geoip.dat",
+		}).Build(); err == nil {
+			t.Fatalf("expected error for %q", rawURL)
+		}
+	}
+}