rio/internal/metrics/metrics.go
Alexander "PapaTutuWawa b2a27cad72
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feat: Do not send metrics if the client used DNT or GPC
2024-02-09 21:02:17 +01:00

100 lines
2.1 KiB
Go

package metrics
import (
"encoding/json"
"net/http"
"os"
"regexp"
"strings"
log "github.com/sirupsen/logrus"
)
type MetricConfig struct {
Url string
BotUserAgents *[]regexp.Regexp
Enabled bool
}
// Checks if we should send a metric ping to page-metrics based on the served path.
func (c *MetricConfig) ShouldSendMetrics(path, userAgent, dnt, gpc string) bool {
if !strings.HasSuffix(path, ".html") || !c.Enabled {
return false
}
// Ignore requests where the user have set "Do-Not-Track" or "Do-Not-Sell-My-Data", even though
// there is no user data and we're not selling it.
if dnt == "1" || gpc == "1" {
return false
}
// Filter out bots
for _, pattern := range *c.BotUserAgents {
if pattern.MatchString(userAgent) {
return false
}
}
return true
}
func (c *MetricConfig) SendMetricPing(domain, path, referrer string) {
data := map[string]string{
"domain": domain,
"path": path,
"referer": referrer,
}
jsonData, err := json.Marshal(data)
if err != nil {
log.Errorf("Failed to send metric ping: %v", err)
return
}
log.Debugf("Sending payload %s", string(jsonData))
// Send the ping to the server
go func() {
res, err := http.Post(
c.Url,
"application/json",
strings.NewReader(string(jsonData)),
)
if err != nil {
log.Errorf("Failed to send payload to: %v", err)
return
}
defer res.Body.Close()
if res.StatusCode != 200 {
log.Errorf("Server returned non-200 status code %d", res.StatusCode)
}
}()
}
// Reads a JSON array of bot user agents from disk and parses them
// into regular expressions.
func ReadBotPatterns(file string) ([]regexp.Regexp, error) {
content, err := os.ReadFile(file)
if err != nil {
log.Warnf("Failed to read bot metrics file: %v", err)
return []regexp.Regexp{}, err
}
var payload []string
err = json.Unmarshal(content, &payload)
if err != nil {
log.Warnf("Failed to unmarshal file: %v", err)
return []regexp.Regexp{}, err
}
patterns := make([]regexp.Regexp, 0)
for _, v := range payload {
patterns = append(
patterns,
*regexp.MustCompile(v),
)
}
return patterns, nil
}