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package main
import (
"crypto/sha1"
"encoding/base64"
"encoding/json"
"fmt"
"net"
"net/http"
"os"
"path"
"sync"
"time"
)
type Logger struct {
LogDir string
LogIP bool
LogUserAgent bool
LogReferer bool
HashIP bool
HashUserAgent bool
HashReferer bool
HashSalt string
logFile *os.File
encoder *json.Encoder
lastDate string
lock sync.Mutex
}
type LogEntry map[string]interface{}
func InitLogger(logdir string) *Logger {
return &Logger{
LogDir: logdir,
}
}
func (l *Logger) Log(entry LogEntry) {
l.lock.Lock()
defer l.lock.Unlock()
_, err := l.getLogFile()
if err != nil {
fmt.Fprintf(os.Stderr, "error opening log file: %s\n", err)
return
}
err = l.encoder.Encode(entry)
if err != nil {
fmt.Fprintf(os.Stderr, "error writing to log: %s\n", err)
}
}
func (l *Logger) LogUpload(req *http.Request, res result) {
host, _, _ := net.SplitHostPort(req.RemoteAddr)
l.logUpload(
host, // ip
req.UserAgent(), // userAgent
req.Referer(), // referer
res.Name, // origName
path.Base(res.Url), // idext
res.Hash, // hash
res.Size, // size
)
}
func (l *Logger) logUpload(ip, userAgent, referer, origName, idext, hash string, size int64) {
if !l.LogIP {
ip = ""
} else if l.HashIP {
ip = l.hash(ip)
}
if !l.LogUserAgent {
userAgent = ""
} else if l.HashUserAgent {
userAgent = l.hash(userAgent)
}
if !l.LogReferer {
referer = ""
} else if l.HashReferer {
referer = l.hash(referer)
}
l.Log(LogEntry{
"type": "upload",
"timestamp": time.Now().UTC().Format(time.RFC3339),
"ip": ip,
"user_agent": userAgent,
"referer": referer,
"orig_name": origName,
"id": idext,
"hash": hash,
"size": size,
})
}
func (l *Logger) hash(s string) string {
h := sha1.New()
h.Write([]byte(l.HashSalt))
h.Write([]byte(s))
h.Write([]byte(l.HashSalt))
return base64.RawURLEncoding.EncodeToString(h.Sum(nil))
}
func (l *Logger) getLogFile() (*os.File, error) {
if l.lastDate == "" {
if err := os.MkdirAll(l.LogDir, 0755); err != nil {
return nil, err
}
}
currentDate := time.Now().UTC().Format("2006-01-02")
if l.lastDate == currentDate {
return l.logFile, nil
}
f, err := os.OpenFile(path.Join(l.LogDir, currentDate+".log.json"), os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0600)
if err != nil {
return f, err
}
if l.logFile != nil {
l.logFile.Close()
}
l.lastDate = currentDate
l.logFile = f
l.encoder = json.NewEncoder(f)
return f, nil
}
var DefaultLogger = InitLogger("log")
func Log(entry LogEntry) {
if DefaultLogger != nil {
DefaultLogger.Log(entry)
}
}
func LogUpload(req *http.Request, res result) {
if DefaultLogger != nil {
DefaultLogger.LogUpload(req, res)
}
}
|