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Identify each CLI install to HEY with its own install_id #355
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| package auth | ||
|
|
||
| import ( | ||
| "crypto/rand" | ||
| "fmt" | ||
| "os" | ||
| "path/filepath" | ||
| "regexp" | ||
| "strings" | ||
| ) | ||
|
|
||
| // InstallID identifies this install to HEY as a device, minting the identifier on first | ||
| // use. It lives beside the credentials rather than in them: a device outlasts a logout, | ||
| // and HEY alerts on a sign-in from a device it hasn't seen. | ||
| func (s *Store) InstallID() (string, error) { | ||
| unlock, err := s.lock() | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| defer unlock() | ||
|
|
||
| return s.installID() | ||
| } | ||
|
|
||
| // installID is the unlocked variant, for a caller already holding the store lock. | ||
| func (s *Store) installID() (string, error) { | ||
| path := s.installIDPath() | ||
|
|
||
| data, err := os.ReadFile(path) //nolint:gosec // G304: path built from the store's own config directory | ||
| if err == nil { | ||
| // Only a well-formed identifier is a usable identity. A truncated or | ||
| // garbage file — an earlier write interrupted by a crash or a full | ||
| // disk, say — must not be adopted and sent to HEY on every login and | ||
| // refresh, so fall through and mint a fresh one over it. | ||
| if id := strings.TrimSpace(string(data)); isInstallID(id) { | ||
| return id, nil | ||
| } | ||
| } else if !os.IsNotExist(err) { | ||
| return "", err | ||
| } | ||
|
|
||
| id := newInstallID() | ||
| if err := os.MkdirAll(s.fallbackDir, 0700); err != nil { | ||
| return "", err | ||
| } | ||
| if err := writeFileAtomic(path, []byte(id+"\n"), 0600); err != nil { | ||
| return "", err | ||
| } | ||
| return id, nil | ||
| } | ||
|
|
||
| // installIDPattern is the canonical version-4 UUID shape newInstallID mints and | ||
| // the mobile apps send. | ||
| var installIDPattern = regexp.MustCompile(`^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$`) | ||
|
|
||
| func isInstallID(id string) bool { | ||
| return installIDPattern.MatchString(id) | ||
| } | ||
|
|
||
| // writeFileAtomic writes data to a temporary mode-perm file in the destination | ||
| // directory and renames it into place. A crash or full disk mid-write then | ||
| // leaves the previous file (or none) rather than a truncated one that the next | ||
| // run would mistake for a valid identifier. | ||
| func writeFileAtomic(path string, data []byte, perm os.FileMode) error { | ||
| tmp, err := os.CreateTemp(filepath.Dir(path), ".install_id-*") | ||
| if err != nil { | ||
| return err | ||
| } | ||
| tmpName := tmp.Name() | ||
| defer func() { | ||
| if tmpName != "" { | ||
| _ = os.Remove(tmpName) | ||
| } | ||
| }() | ||
|
|
||
| if err := tmp.Chmod(perm); err != nil { | ||
| _ = tmp.Close() | ||
| return err | ||
| } | ||
| if _, err := tmp.Write(data); err != nil { | ||
| _ = tmp.Close() | ||
| return err | ||
| } | ||
| if err := tmp.Sync(); err != nil { | ||
| _ = tmp.Close() | ||
| return err | ||
| } | ||
| if err := tmp.Close(); err != nil { | ||
| return err | ||
| } | ||
| if err := os.Rename(tmpName, path); err != nil { | ||
|
jeremy marked this conversation as resolved.
|
||
| return err | ||
| } | ||
| tmpName = "" // renamed into place; nothing to clean up | ||
| return nil | ||
| } | ||
|
|
||
| func (s *Store) installIDPath() string { | ||
| return filepath.Join(s.fallbackDir, "install_id") | ||
| } | ||
|
|
||
| // newInstallID is a random version-4 UUID, the shape the mobile apps send. | ||
| func newInstallID() string { | ||
| b := make([]byte, 16) | ||
| if _, err := rand.Read(b); err != nil { | ||
| panic("crypto/rand failed: " + err.Error()) | ||
| } | ||
| b[6] = (b[6] & 0x0f) | 0x40 | ||
| b[8] = (b[8] & 0x3f) | 0x80 | ||
| return fmt.Sprintf("%x-%x-%x-%x-%x", b[0:4], b[4:6], b[6:8], b[8:10], b[10:16]) | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| package auth | ||
|
|
||
| import ( | ||
| "os" | ||
| "path/filepath" | ||
| "regexp" | ||
| "testing" | ||
| ) | ||
|
|
||
| var uuidV4 = regexp.MustCompile(`^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$`) | ||
|
|
||
| func TestInstallIDIsMintedOnceAndPersists(t *testing.T) { | ||
| t.Setenv("HEY_NO_KEYRING", "1") | ||
| configDir := t.TempDir() | ||
| store := NewStore(configDir) | ||
|
|
||
| first, err := store.InstallID() | ||
| if err != nil { | ||
| t.Fatalf("InstallID: %v", err) | ||
| } | ||
| if !uuidV4.MatchString(first) { | ||
| t.Fatalf("install id = %q, want a v4 UUID", first) | ||
| } | ||
|
|
||
| second, err := store.InstallID() | ||
| if err != nil { | ||
| t.Fatalf("InstallID: %v", err) | ||
| } | ||
| if second != first { | ||
| t.Errorf("install id changed between calls: %q then %q", first, second) | ||
| } | ||
|
|
||
| if other, _ := NewStore(configDir).InstallID(); other != first { | ||
| t.Errorf("install id = %q from a second store on the same directory, want %q", other, first) | ||
| } | ||
|
|
||
| info, err := os.Stat(filepath.Join(configDir, "install_id")) | ||
| if err != nil { | ||
| t.Fatalf("Stat: %v", err) | ||
| } | ||
| if perm := info.Mode().Perm(); perm != 0600 { | ||
| t.Errorf("install_id mode = %o, want 0600", perm) | ||
| } | ||
| } | ||
|
|
||
| func TestInstallIDSurvivesLogout(t *testing.T) { | ||
| t.Setenv("HEY_NO_KEYRING", "1") | ||
| configDir := t.TempDir() | ||
| mgr := NewManager("https://app.hey.com", nil, configDir) | ||
|
|
||
| id, err := mgr.GetStore().InstallID() | ||
| if err != nil { | ||
| t.Fatalf("InstallID: %v", err) | ||
| } | ||
| if err := mgr.LoginWithToken("token"); err != nil { | ||
| t.Fatalf("LoginWithToken: %v", err) | ||
| } | ||
| if err := mgr.Logout(); err != nil { | ||
| t.Fatalf("Logout: %v", err) | ||
| } | ||
|
|
||
| if after, _ := mgr.GetStore().InstallID(); after != id { | ||
| t.Errorf("install id = %q after logout, want %q", after, id) | ||
| } | ||
| } | ||
|
|
||
| func TestInstallIDsDifferPerInstall(t *testing.T) { | ||
| t.Setenv("HEY_NO_KEYRING", "1") | ||
| a, _ := NewStore(t.TempDir()).InstallID() | ||
| b, _ := NewStore(t.TempDir()).InstallID() | ||
| if a == b { | ||
| t.Errorf("two installs share install id %q", a) | ||
| } | ||
| } | ||
|
|
||
| func TestInstallIDReplacesAMalformedFile(t *testing.T) { | ||
| t.Setenv("HEY_NO_KEYRING", "1") | ||
| configDir := t.TempDir() | ||
| path := filepath.Join(configDir, "install_id") | ||
|
|
||
| // A truncated or garbage file — e.g. a write interrupted by a crash or a | ||
| // full disk, or the old constant "hey-cli" identifier — is not a usable | ||
| // identity and must be reminted, never sent to HEY as-is. | ||
| if err := os.WriteFile(path, []byte("hey-cli"), 0600); err != nil { | ||
| t.Fatalf("seed: %v", err) | ||
| } | ||
|
|
||
| id, err := NewStore(configDir).InstallID() | ||
| if err != nil { | ||
| t.Fatalf("InstallID: %v", err) | ||
| } | ||
| if !uuidV4.MatchString(id) { | ||
| t.Fatalf("install id = %q, want a v4 UUID", id) | ||
| } | ||
|
|
||
| // The mint is durable: the replacement is written back, so a second store | ||
| // reads the same value rather than reminting again. | ||
| if again, _ := NewStore(configDir).InstallID(); again != id { | ||
| t.Errorf("install id = %q on reload, want the reminted %q", again, id) | ||
| } | ||
| } |
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