feat: sync langpack and auth updates

Sync telesrv commits 49f9bab and 04d9563 into the public mirror. Exclude private docs and runtime key material per sync rules.

cmd/langpackfetch/main_test.go

@@ -0,0 +1,78 @@
+package main
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/iamxvbaba/td/tg"
+)
+
+func TestWritePack(t *testing.T) {
+	root := t.TempDir()
+	diff := &tg.LangPackDifference{
+		LangCode: "pt-br",
+		Version:  42,
+		Strings: []tg.LangPackStringClass{
+			&tg.LangPackString{Key: "plain", Value: "value"},
+			&tg.LangPackStringPluralized{Key: "items", OneValue: "one", OtherValue: "many"},
+			&tg.LangPackStringDeleted{Key: "removed"},
+		},
+	}
+	written, err := writePack(root, "tdesktop", diff)
+	if err != nil {
+		t.Fatal(err)
+	}
+	wantPath := filepath.Join(root, "tdesktop", "tdesktop_pt-br_v42.strings")
+	if written.Path != wantPath {
+		t.Fatalf("path = %q, want %q", written.Path, wantPath)
+	}
+	data, err := os.ReadFile(wantPath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	text := string(data)
+	for _, want := range []string{`"plain" = "value";`, `"items#one" = "one";`, `"items#other" = "many";`} {
+		if !strings.Contains(text, want) {
+			t.Errorf("output does not contain %q: %s", want, text)
+		}
+	}
+	if strings.Contains(text, "removed") {
+		t.Errorf("deleted key was emitted: %s", text)
+	}
+	sum := sha256.Sum256(data)
+	if written.SHA256 != hex.EncodeToString(sum[:]) {
+		t.Fatalf("sha256 = %q, want %x", written.SHA256, sum)
+	}
+}
+
+func TestWritePackRejectsPathComponents(t *testing.T) {
+	_, err := writePack(t.TempDir(), "../android", &tg.LangPackDifference{LangCode: "en", Version: 1})
+	if err == nil {
+		t.Fatal("expected invalid pack error")
+	}
+	_, err = writePack(t.TempDir(), "android", &tg.LangPackDifference{LangCode: "../en", Version: 1})
+	if err == nil {
+		t.Fatal("expected invalid language code error")
+	}
+}
+
+func TestWriteFileAtomicReplacesExisting(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "manifest.json")
+	if err := writeFileAtomic(path, []byte("first")); err != nil {
+		t.Fatal(err)
+	}
+	if err := writeFileAtomic(path, []byte("second")); err != nil {
+		t.Fatal(err)
+	}
+	data, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(data) != "second" {
+		t.Fatalf("content = %q, want second", data)
+	}
+}