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log.go
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log.go
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package main
import (
"bytes"
"crypto/md5"
"encoding/csv"
"fmt"
"log"
"mime"
"net/http"
"net/url"
"os"
"path/filepath"
"strconv"
"strings"
"sync"
"time"
)
// recording pages filtered to access log
var (
accessLog CSVLog
tlsLog CSVLog
contentLog CSVLog
)
type CSVLog struct {
lock sync.Mutex
file *os.File
csv *csv.Writer
}
func (l *CSVLog) Open(filename string) {
l.lock.Lock()
defer l.lock.Unlock()
if l.file != nil && l.file != os.Stdout {
l.file.Close()
l.file = nil
}
if filename != "" {
logfile, err := os.OpenFile(filename, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0644)
if err != nil {
log.Printf("Could not open log file (%s): %s\n Sending log messages to standard output instead.", filename, err)
} else {
l.file = logfile
}
}
if l.file == nil {
l.file = os.Stdout
}
l.csv = csv.NewWriter(l.file)
}
func (l *CSVLog) Log(data []string) {
l.lock.Lock()
defer l.lock.Unlock()
l.csv.Write(data)
l.csv.Flush()
}
func logAccess(req *http.Request, resp *http.Response, contentLength int, pruned bool, user string, tally map[rule]int, scores map[string]int, rule ACLActionRule, title string, ignored []string) []string {
conf := getConfig()
modified := ""
if pruned {
modified = "pruned"
}
status := 0
if resp != nil {
status = resp.StatusCode
}
if rule.Action == "" {
rule.Action = "allow"
}
var contentType string
if resp != nil {
contentType = resp.Header.Get("Content-Type")
}
if ct2, _, err := mime.ParseMediaType(contentType); err == nil {
contentType = ct2
}
var userAgent string
if conf.LogUserAgent {
userAgent = req.Header.Get("User-Agent")
}
logLine := toStrings(time.Now().Format("2006-01-02 15:04:05.000000"), user, rule.Action, req.URL, req.Method, status, contentType, contentLength, modified, listTally(stringTally(tally)), listTally(scores), rule.Conditions(), title, strings.Join(ignored, ","), userAgent, req.Proto, req.Referer(), platform(req.Header.Get("User-Agent")))
accessLog.Log(logLine)
return logLine
}
func logTLS(user, serverAddr, serverName string, err error, cachedCert bool, tlsFingerprint string) {
errStr := ""
if err != nil {
errStr = err.Error()
}
cached := ""
if cachedCert {
cached = "cached certificate"
}
tlsLog.Log(toStrings(time.Now().Format("2006-01-02 15:04:05.000000"), user, serverName, serverAddr, errStr, cached, tlsFingerprint))
}
func logContent(u *url.URL, content []byte, scores map[string]int) {
conf := getConfig()
if conf.ContentLogDir == "" {
return
}
filename := fmt.Sprintf("%x", md5.Sum(content))
path := filepath.Join(conf.ContentLogDir, filename)
f, err := os.OpenFile(path, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0644)
if err != nil {
log.Printf("Error creating content log file (%s): %v", path, err)
return
}
defer f.Close()
topCategory, topScore := "", 0
for c, s := range scores {
if s > topScore && conf.Categories[c] != nil && conf.Categories[c].action != ACL {
topCategory = c
topScore = s
}
}
f.Write(content)
contentLog.Log([]string{u.String(), filename, topCategory, strconv.Itoa(topScore)})
}
// toStrings converts its arguments into a slice of strings.
func toStrings(a ...interface{}) []string {
result := make([]string, len(a))
for i, x := range a {
result[i] = fmt.Sprint(x)
}
return result
}
// stringTally returns a copy of tally with strings instead of rules as keys.
func stringTally(tally map[rule]int) map[string]int {
st := make(map[string]int)
for r, n := range tally {
st[r.String()] = n
}
return st
}
// listTally sorts the tally and formats it as a comma-separated string.
func listTally(tally map[string]int) string {
b := new(bytes.Buffer)
for i, rule := range sortedKeys(tally) {
if i > 0 {
b.WriteString(", ")
}
fmt.Fprint(b, rule, " ", tally[rule])
}
return b.String()
}