[feature] request blocking by http headers (#2409)

internal/gtsmodel/headerfilter.go

@@ -0,0 +1,54 @@
+// 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 gtsmodel
+
+import (
+	"time"
+	"unsafe"
+)
+
+func init() {
+	// Note that since all of the below calculations are
+	// constant, these should be optimized out of builds.
+	const filterSz = unsafe.Sizeof(HeaderFilter{})
+	if unsafe.Sizeof(HeaderFilterAllow{}) != filterSz {
+		panic("HeaderFilterAllow{} needs to have the same in-memory size / layout as HeaderFilter{}")
+	}
+	if unsafe.Sizeof(HeaderFilterBlock{}) != filterSz {
+		panic("HeaderFilterBlock{} needs to have the same in-memory size / layout as HeaderFilter{}")
+	}
+}
+
+// HeaderFilterAllow represents an allow HTTP header filter in the database.
+type HeaderFilterAllow struct{ HeaderFilter }
+
+// HeaderFilterBlock represents a block HTTP header filter in the database.
+type HeaderFilterBlock struct{ HeaderFilter }
+
+// HeaderFilter represents an HTTP request filter in
+// the database, with a header to match against, value
+// matching regex, and details about its creation.
+type HeaderFilter struct {
+	ID        string    `bun:"type:CHAR(26),pk,nullzero,notnull,unique"`                    // ID of this item in the database
+	Header    string    `bun:",nullzero,notnull,unique:header_regex"`                       // Request header this filter pertains to
+	Regex     string    `bun:",nullzero,notnull,unique:header_regex"`                       // Request header value matching regular expression
+	AuthorID  string    `bun:"type:CHAR(26),nullzero,notnull"`                              // Account ID of the creator of this filter
+	Author    *Account  `bun:"-"`                                                           // Account corresponding to AuthorID
+	CreatedAt time.Time `bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"` // when was item created
+	UpdatedAt time.Time `bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"` // when was item last updated
+}