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package backend
import (
"context"
"database/sql"
"fmt"
"log/slog"
"net/http"
"regexp"
"slices"
"strconv"
"strings"
"sync"
"time"
"github.com/go-chi/chi/v5"
)
type loaded struct {
data map[string]struct{}
mu *sync.RWMutex
}
func (l *loaded) Has(k string) bool {
l.mu.RLock()
defer l.mu.RUnlock()
_, ok := l.data[k]
return ok
}
func (l *loaded) Add(k string) {
l.mu.Lock()
defer l.mu.Unlock()
l.data[k] = struct{}{}
}
func (l *loaded) Remove(k string) {
l.mu.Lock()
defer l.mu.Unlock()
delete(l.data, k)
}
func newLoaded() *loaded {
return &loaded{
data: make(map[string]struct{}),
mu: new(sync.RWMutex),
}
}
var trimRefererReg = regexp.MustCompile(`https?://([a-z-0-9.]+(:\d+)?)/.*`)
var load = newLoaded()
func getDB(ctx context.Context) *sql.DB {
return ctx.Value(dbKey).(*sql.DB)
}
func UpdateStats(ctx context.Context, r *http.Request) error {
target := r.URL.Path
if strings.HasPrefix(target, "/static") || strings.HasPrefix(target, "/admin") {
return nil
}
ref := r.Header.Get("Referer")
if ref == "" {
return nil
}
subs := trimRefererReg.FindStringSubmatch(ref)
if len(subs) < 2 {
return nil
}
ref = subs[1]
if ref == ctx.Value(configKey).(*Config).Domain || ref == fmt.Sprintf("localhost:%d", 8000) {
ref = subs[0][strings.Index(subs[0], ref)+len(ref):]
if ref == target || strings.HasPrefix(ref, "/admin") || ref == "/favicon.ico" {
return nil
}
}
// using /assets/styles.css to detect if a page is loaded → majority of bots will not load this
if target == "/assets/styles.css" {
target = ref
ref = "?"
}
if load.Has(target) {
return nil
}
db := getDB(ctx)
rows, err := db.QueryContext(ctx, "SELECT id, visit FROM stats WHERE origin = ? AND target = ?", ref, target)
if err != nil {
return err
}
defer func() {
if err == nil {
slog.Debug("stats updated")
load.Add(target)
go func(target string) {
time.Sleep(5 * time.Second)
load.Remove(target)
}(target)
}
}()
if !rows.Next() {
_, err = db.ExecContext(ctx, "INSERT INTO stats (origin, target, visit) VALUES (?, ?, 1)", ref, target)
return err
}
var id uint
var nb uint
err = rows.Scan(&id, &nb)
if err != nil {
return err
}
err = rows.Close()
if err != nil {
return err
}
_, err = db.ExecContext(ctx, "UPDATE stats SET visit = ? WHERE id = ?", nb+1, id)
return err
}
type statRow struct {
Origin string
Target string
Visit uint
}
const statPerPage = 25
func GetStatRows(ctx context.Context, page uint) ([]statRow, error) {
rows, err := getDB(ctx).QueryContext(
ctx,
"SELECT origin, target, visit FROM stats ORDER BY visit DESC LIMIT ? OFFSET ?",
statPerPage, (page-1)*statPerPage,
)
if err != nil {
return nil, err
}
defer rows.Close()
statRows := make([]statRow, statPerPage)
var i uint8
for i = 0; rows.Next(); i++ {
var stat statRow
err = rows.Scan(&stat.Origin, &stat.Target, &stat.Visit)
if err != nil {
return nil, err
}
statRows[i] = stat
}
if i == 0 {
return nil, nil
}
return statRows[:i], nil
}
func GetUnionStatRows(ctx context.Context) ([]statRow, error) {
rows, err := getDB(ctx).QueryContext(ctx, "SELECT target, visit FROM stats ORDER BY visit DESC")
if err != nil {
return nil, err
}
defer rows.Close()
data := make(map[string]uint)
for rows.Next() {
var stat statRow
err = rows.Scan(&stat.Target, &stat.Visit)
if err != nil {
return nil, err
}
if _, ok := data[stat.Target]; !ok {
data[stat.Target] = stat.Visit
} else {
data[stat.Target] += stat.Visit
}
}
var statRows []statRow
for k, v := range data {
statRows = append(statRows, statRow{
Target: k,
Visit: v,
})
}
slices.SortFunc(statRows, func(a, b statRow) int {
return int(b.Visit) - int(a.Visit)
})
return statRows, nil
}
type adminData struct {
*data
Visits []statRow
Rows []statRow
PagesNumber int
CurrentPage int
}
func HandleAdmin(r *chi.Mux) {
r.Get("/admin", func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
if !ctx.Value(loginKey).(bool) {
w.Header().Set("WWW-Authenticate", `Basic realm="restricted", charset="UTF-8"`)
http.Error(w, "Unauthorized", http.StatusUnauthorized)
return
}
d := new(adminData)
d.data = new(data)
rawPage := r.URL.Query().Get("page")
page := 1
var err error
if rawPage != "" {
page, err = strconv.Atoi(rawPage)
if err != nil || page < 1 {
slog.Warn("invalid page number", "rawPage", rawPage)
http.Error(w, "Bad request", http.StatusBadRequest)
return
}
}
d.Rows, err = GetStatRows(ctx, uint(page))
if err != nil {
panic(err)
}
d.Visits, err = GetUnionStatRows(ctx)
if err != nil {
panic(err)
}
d.PagesNumber = page + max(len(d.Rows)-statPerPage+1, 0)
d.CurrentPage = page
d.handleGeneric(w, r, "admin", d)
})
}
|
