add vendoring

vendor/maunium.net/go/mautrix/id/trust.go

@@ -0,0 +1,87 @@
+// Copyright (c) 2022 Tulir Asokan
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package id
+
+import (
+	"fmt"
+	"strings"
+)
+
+// TrustState determines how trusted a device is.
+type TrustState int
+
+const (
+	TrustStateBlacklisted          TrustState = -100
+	TrustStateUnset                TrustState = 0
+	TrustStateUnknownDevice        TrustState = 10
+	TrustStateForwarded            TrustState = 20
+	TrustStateCrossSignedUntrusted TrustState = 50
+	TrustStateCrossSignedTOFU      TrustState = 100
+	TrustStateCrossSignedVerified  TrustState = 200
+	TrustStateVerified             TrustState = 300
+	TrustStateInvalid              TrustState = (1 << 31) - 1
+)
+
+func (ts *TrustState) UnmarshalText(data []byte) error {
+	strData := string(data)
+	state := ParseTrustState(strData)
+	if state == TrustStateInvalid {
+		return fmt.Errorf("invalid trust state %q", strData)
+	}
+	*ts = state
+	return nil
+}
+
+func (ts *TrustState) MarshalText() ([]byte, error) {
+	return []byte(ts.String()), nil
+}
+
+func ParseTrustState(val string) TrustState {
+	switch strings.ToLower(val) {
+	case "blacklisted":
+		return TrustStateBlacklisted
+	case "unverified":
+		return TrustStateUnset
+	case "cross-signed-untrusted":
+		return TrustStateCrossSignedUntrusted
+	case "unknown-device":
+		return TrustStateUnknownDevice
+	case "forwarded":
+		return TrustStateForwarded
+	case "cross-signed-tofu", "cross-signed":
+		return TrustStateCrossSignedTOFU
+	case "cross-signed-verified", "cross-signed-trusted":
+		return TrustStateCrossSignedVerified
+	case "verified":
+		return TrustStateVerified
+	default:
+		return TrustStateInvalid
+	}
+}
+
+func (ts TrustState) String() string {
+	switch ts {
+	case TrustStateBlacklisted:
+		return "blacklisted"
+	case TrustStateUnset:
+		return "unverified"
+	case TrustStateCrossSignedUntrusted:
+		return "cross-signed-untrusted"
+	case TrustStateUnknownDevice:
+		return "unknown-device"
+	case TrustStateForwarded:
+		return "forwarded"
+	case TrustStateCrossSignedTOFU:
+		return "cross-signed-tofu"
+	case TrustStateCrossSignedVerified:
+		return "cross-signed-verified"
+	case TrustStateVerified:
+		return "verified"
+	default:
+		return "invalid"
+	}
+}