[chore] Refactor AP authentication, other small bits of tidying up (#1874)

internal/api/util/signaturectx.go

@@ -1,40 +0,0 @@
-// GoToSocial
-// Copyright (C) GoToSocial Authors admin@gotosocial.org
-// SPDX-License-Identifier: AGPL-3.0-or-later
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Affero General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Affero General Public License for more details.
-//
-// You should have received a copy of the GNU Affero General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-package util
-
-import (
-	"context"
-
-	"github.com/gin-gonic/gin"
-	"github.com/superseriousbusiness/gotosocial/internal/ap"
-)
-
-// TransferSignatureContext transfers a signature verifier and signature from a gin context to a go context.
-func TransferSignatureContext(c *gin.Context) context.Context {
-	ctx := c.Request.Context()
-
-	if verifier, signed := c.Get(string(ap.ContextRequestingPublicKeyVerifier)); signed {
-		ctx = context.WithValue(ctx, ap.ContextRequestingPublicKeyVerifier, verifier)
-	}
-
-	if signature, signed := c.Get(string(ap.ContextRequestingPublicKeySignature)); signed {
-		ctx = context.WithValue(ctx, ap.ContextRequestingPublicKeySignature, signature)
-	}
-
-	return ctx
-}