94 lines
2.4 KiB
Go
94 lines
2.4 KiB
Go
// Copyright 2025-present Gustavo "Guz" L. de Mello
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// Copyright 2025-present The Lored.dev Contributors
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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 middleware
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import (
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"fmt"
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"log/slog"
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"math/rand"
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"net/http"
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)
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func Logger(logger *slog.Logger) Middleware {
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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lw := &loggerResponseWriter{w, 0}
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addr := loggerGetAddr(r)
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log := logger.With(
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slog.String("id", randHash(5)),
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slog.String("method", fmt.Sprintf("%4s", r.Method)),
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slog.String("addr", addr),
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slog.String("path", r.URL.Path),
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)
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log.Debug("NEW REQUEST", slog.String("status", "000"))
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next.ServeHTTP(lw, r)
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log = log.With(slog.String("status", fmt.Sprintf("%3d", lw.statusCode)))
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switch {
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case lw.statusCode >= 500:
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log.Warn("ERR REQUEST")
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case lw.statusCode >= 400:
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log.Info("INV REQUEST")
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case lw.statusCode >= 200:
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log.Debug("END REQUEST")
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default:
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log.Debug("MSC REQUEST")
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}
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})
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}
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}
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func loggerGetAddr(r *http.Request) string {
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if i := r.Header.Get("CF-Connecting-IP"); i != "" {
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return i
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}
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if i := r.Header.Get("X-Forwarded-For"); i != "" {
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return i
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}
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if i := r.Header.Get("X-Real-IP"); i != "" {
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return i
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}
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return r.RemoteAddr
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}
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type loggerResponseWriter struct {
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http.ResponseWriter
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statusCode int
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}
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func (w *loggerResponseWriter) WriteHeader(s int) {
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w.statusCode = s
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w.ResponseWriter.WriteHeader(s)
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}
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const hashChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
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// This is not the most performant function, as a TODO we could
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// improve based on this Stackoberflow thread:
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// https://stackoverflow.com/questions/22892120/how-to-generate-a-random-string-of-a-fixed-length-in-go
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func randHash(n int) string {
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b := make([]byte, n)
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for i := range b {
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b[i] = hashChars[rand.Int63()%int64(len(hashChars))]
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}
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return string(b)
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}
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