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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 caddyhttp
import (
"errors"
"net"
"net/http"
"strings"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"github.com/caddyserver/caddy/v2"
)
// ServerLogConfig describes a server's logging configuration. If
// enabled without customization, all requests to this server are
// logged to the default logger; logger destinations may be
// customized per-request-host.
type ServerLogConfig struct {
// The default logger name for all logs emitted by this server for
// hostnames that are not in the LoggerNames (logger_names) map.
DefaultLoggerName string `json:"default_logger_name,omitempty"`
// LoggerNames maps request hostnames to a custom logger name.
// For example, a mapping of "example.com" to "example" would
// cause access logs from requests with a Host of example.com
// to be emitted by a logger named "http.log.access.example".
LoggerNames map[string]string `json:"logger_names,omitempty"`
// By default, all requests to this server will be logged if
// access logging is enabled. This field lists the request
// hosts for which access logging should be disabled.
SkipHosts []string `json:"skip_hosts,omitempty"`
// If true, requests to any host not appearing in the
// LoggerNames (logger_names) map will not be logged.
SkipUnmappedHosts bool `json:"skip_unmapped_hosts,omitempty"`
// If true, credentials that are otherwise omitted, will be logged.
// The definition of credentials is defined by https://fetch.spec.whatwg.org/#credentials,
// and this includes some request and response headers, i.e `Cookie`,
// `Set-Cookie`, `Authorization`, and `Proxy-Authorization`.
ShouldLogCredentials bool `json:"should_log_credentials,omitempty"`
}
// wrapLogger wraps logger in a logger named according to user preferences for the given host.
func (slc ServerLogConfig) wrapLogger(logger *zap.Logger, host string) *zap.Logger {
if loggerName := slc.getLoggerName(host); loggerName != "" {
return logger.Named(loggerName)
}
return logger
}
func (slc ServerLogConfig) getLoggerName(host string) string {
tryHost := func(key string) (string, bool) {
// first try exact match
if loggerName, ok := slc.LoggerNames[key]; ok {
return loggerName, ok
}
// strip port and try again (i.e. Host header of "example.com:1234" should
// match "example.com" if there is no "example.com:1234" in the map)
hostOnly, _, err := net.SplitHostPort(key)
if err != nil {
return "", false
}
loggerName, ok := slc.LoggerNames[hostOnly]
return loggerName, ok
}
// try the exact hostname first
if loggerName, ok := tryHost(host); ok {
return loggerName
}
// try matching wildcard domains if other non-specific loggers exist
labels := strings.Split(host, ".")
for i := range labels {
if labels[i] == "" {
continue
}
labels[i] = "*"
wildcardHost := strings.Join(labels, ".")
if loggerName, ok := tryHost(wildcardHost); ok {
return loggerName
}
}
return slc.DefaultLoggerName
}
func (slc *ServerLogConfig) clone() *ServerLogConfig {
clone := &ServerLogConfig{
DefaultLoggerName: slc.DefaultLoggerName,
LoggerNames: make(map[string]string),
SkipHosts: append([]string{}, slc.SkipHosts...),
SkipUnmappedHosts: slc.SkipUnmappedHosts,
ShouldLogCredentials: slc.ShouldLogCredentials,
}
for k, v := range slc.LoggerNames {
clone.LoggerNames[k] = v
}
return clone
}
// errLogValues inspects err and returns the status code
// to use, the error log message, and any extra fields.
// If err is a HandlerError, the returned values will
// have richer information.
func errLogValues(err error) (status int, msg string, fields []zapcore.Field) {
var handlerErr HandlerError
if errors.As(err, &handlerErr) {
status = handlerErr.StatusCode
if handlerErr.Err == nil {
msg = err.Error()
} else {
msg = handlerErr.Err.Error()
}
fields = []zapcore.Field{
zap.Int("status", handlerErr.StatusCode),
zap.String("err_id", handlerErr.ID),
zap.String("err_trace", handlerErr.Trace),
}
return
}
status = http.StatusInternalServerError
msg = err.Error()
return
}
// ExtraLogFields is a list of extra fields to log with every request.
type ExtraLogFields struct {
fields []zapcore.Field
}
// Add adds a field to the list of extra fields to log.
func (e *ExtraLogFields) Add(field zap.Field) {
e.fields = append(e.fields, field)
}
// Set sets a field in the list of extra fields to log.
// If the field already exists, it is replaced.
func (e *ExtraLogFields) Set(field zap.Field) {
for i := range e.fields {
if e.fields[i].Key == field.Key {
e.fields[i] = field
return
}
}
e.fields = append(e.fields, field)
}
const (
// Variable name used to indicate that this request
// should be omitted from the access logs
SkipLogVar string = "skip_log"
// For adding additional fields to the access logs
ExtraLogFieldsCtxKey caddy.CtxKey = "extra_log_fields"
)
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