mirror of
https://github.com/caddyserver/caddy.git
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95 lines
2.9 KiB
Go
95 lines
2.9 KiB
Go
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// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package logging
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import (
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"net/http"
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"strings"
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"go.uber.org/zap"
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"github.com/caddyserver/caddy/v2"
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"github.com/caddyserver/caddy/v2/modules/caddyhttp"
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)
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func init() {
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caddy.RegisterModule(LogAppend{})
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}
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// LogAppend implements a middleware that takes a key and value, where
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// the key is the name of a log field and the value is a placeholder,
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// or variable key, or constant value to use for that field.
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type LogAppend struct {
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// Key is the name of the log field.
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Key string `json:"key,omitempty"`
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// Value is the value to use for the log field.
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// If it is a placeholder (with surrounding `{}`),
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// it will be evaluated when the log is written.
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// If the value is a key that exists in the `vars`
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// map, the value of that key will be used. Otherwise
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// the value will be used as-is as a constant string.
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Value string `json:"value,omitempty"`
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}
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// CaddyModule returns the Caddy module information.
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func (LogAppend) CaddyModule() caddy.ModuleInfo {
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return caddy.ModuleInfo{
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ID: "http.handlers.log_append",
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New: func() caddy.Module { return new(LogAppend) },
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}
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}
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func (h LogAppend) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
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// Run the next handler in the chain first.
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// If an error occurs, we still want to add
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// any extra log fields that we can, so we
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// hold onto the error and return it later.
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handlerErr := next.ServeHTTP(w, r)
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// On the way back up the chain, add the extra log field
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ctx := r.Context()
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vars := ctx.Value(caddyhttp.VarsCtxKey).(map[string]any)
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repl := ctx.Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
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extra := ctx.Value(caddyhttp.ExtraLogFieldsCtxKey).(*caddyhttp.ExtraLogFields)
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var varValue any
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if strings.HasPrefix(h.Value, "{") &&
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strings.HasSuffix(h.Value, "}") &&
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strings.Count(h.Value, "{") == 1 {
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// the value looks like a placeholder, so get its value
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varValue, _ = repl.Get(strings.Trim(h.Value, "{}"))
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} else if val, ok := vars[h.Value]; ok {
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// the value is a key in the vars map
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varValue = val
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} else {
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// the value is a constant string
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varValue = h.Value
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}
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// Add the field to the extra log fields.
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// We use zap.Any because it will reflect
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// to the correct type for us.
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extra.Add(zap.Any(h.Key, varValue))
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return handlerErr
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}
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// Interface guards
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var (
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_ caddyhttp.MiddlewareHandler = (*LogAppend)(nil)
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)
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