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// Copyright 2015 Matthew Holt and The Caddy Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package logging
import (
"net"
"github.com/caddyserver/caddy/v2"
"go.uber.org/zap/zapcore"
)
func init() {
caddy.RegisterModule(DeleteFilter{})
caddy.RegisterModule(IPMaskFilter{})
}
// LogFieldFilter can filter (or manipulate)
// a field in a log entry.
type LogFieldFilter interface {
Filter(zapcore.Field) zapcore.Field
}
// DeleteFilter is a Caddy log field filter that
// deletes the field.
type DeleteFilter struct{}
// CaddyModule returns the Caddy module information.
func (DeleteFilter) CaddyModule() caddy.ModuleInfo {
return caddy.ModuleInfo{
ID: "caddy.logging.encoders.filter.delete",
New: func() caddy.Module { return new(DeleteFilter) },
}
}
// Filter filters the input field.
func (DeleteFilter) Filter(in zapcore.Field) zapcore.Field {
in.Type = zapcore.SkipType
return in
}
// IPMaskFilter is a Caddy log field filter that
// masks IP addresses.
type IPMaskFilter struct {
// The IPv4 range in CIDR notation.
IPv4CIDR int `json:"ipv4_cidr,omitempty"`
// The IPv6 range in CIDR notation.
IPv6CIDR int `json:"ipv6_cidr,omitempty"`
}
// CaddyModule returns the Caddy module information.
func (IPMaskFilter) CaddyModule() caddy.ModuleInfo {
return caddy.ModuleInfo{
ID: "caddy.logging.encoders.filter.ip_mask",
New: func() caddy.Module { return new(IPMaskFilter) },
}
}
// Filter filters the input field.
func (m IPMaskFilter) Filter(in zapcore.Field) zapcore.Field {
host, port, err := net.SplitHostPort(in.String)
if err != nil {
host = in.String // assume whole thing was IP address
}
ipAddr := net.ParseIP(host)
if ipAddr == nil {
return in
}
bitLen := 32
cidrPrefix := m.IPv4CIDR
if ipAddr.To16() != nil {
bitLen = 128
cidrPrefix = m.IPv6CIDR
}
mask := net.CIDRMask(cidrPrefix, bitLen)
masked := ipAddr.Mask(mask)
if port == "" {
in.String = masked.String()
} else {
in.String = net.JoinHostPort(masked.String(), port)
}
return in
}
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