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handlers.go
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/
handlers.go
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// Copyright 2021 Changkun Ou. All rights reserved.
// Use of this source code is governed by a MIT
// license that can be found in the LICENSE file.
package main
import (
"context"
"encoding/json"
"errors"
"fmt"
"net/http"
"net/url"
"strings"
"time"
"github.com/google/uuid"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/mongo"
)
type stat struct {
PagePV int64 `json:"page_pv"`
PageUV int64 `json:"page_uv"`
SitePV int64 `json:"site_pv"`
SiteUV int64 `json:"site_uv"`
}
type visit struct {
VisitorID string `json:"visitor_id" bson:"visitor_id"`
Path string `json:"path" bson:"path"`
IP string `json:"ip" bson:"ip"`
UA string `json:"ua" bson:"ua"`
Referer string `json:"referer" bson:"referer"`
Time time.Time `json:"time" bson:"time"`
}
const urlstatCookieVid = "urlstat_vid"
// recording implmenets a very basic pv/uv statistic function. client script
// is distributed from /urlstat/client.js endpoint.
func recording(w http.ResponseWriter, r *http.Request) {
if origin := r.Header.Get("Origin"); origin != "" {
if source.isAllowed(origin, true) {
w.Header().Set("Access-Control-Allow-Origin", origin)
w.Header().Set("Access-Control-Allow-Methods", "GET, OPTIONS")
w.Header().Set("Access-Control-Allow-Headers", "urlstat-ua, urlstat-url")
}
}
if r.Method == "OPTIONS" {
return
}
w.Header().Set("Cache-Control", "no-store")
w.Header().Set("Cache-Control", "max-age=0")
var err error
defer func() {
if err == nil {
return
}
http.Error(w, fmt.Sprintf("bad request: %v", err), http.StatusBadRequest)
}()
keys, ok := r.URL.Query()["mode"]
if ok && len(keys[0]) > 0 && keys[0] == "github" {
err = githubMode(w, r)
return
}
loc := r.Header.Get("urlstat-url")
u, err := url.Parse(loc)
if err != nil {
err = fmt.Errorf("cannot parse url: %w", err)
return
}
// Double check origin, only allow expected
ori := fmt.Sprintf("%s://%s", u.Scheme, u.Host)
if !source.isAllowed(ori, true) {
err = errors.New("origin not allowed")
return
}
// Save reported statistics to database
var cookieVid string
c, err := r.Cookie(urlstatCookieVid)
if err != nil {
cookieVid = ""
} else {
cookieVid = c.Value
}
var vid string
col := db.Database(dbname).Collection(u.Host)
vid, err = saveVisit(r.Context(), col, &visit{
VisitorID: cookieVid,
Path: u.Path,
IP: readIP(r),
UA: r.Header.Get("urlstat-ua"),
Referer: r.Referer(),
Time: time.Now().UTC(),
})
if err != nil {
err = fmt.Errorf("failed to save visit: %w", err)
return
}
if cookieVid == "" && vid != "" {
w.Header().Set("Set-Cookie", urlstatCookieVid+"="+vid)
}
// Report page statistics
var stat stat
for _, value := range r.URL.Query()["report"] {
args := strings.Split(value, " ")
for _, arg := range args {
var pv, uv int64
pv, uv, err = countVisit(r.Context(), col, u.Path, arg)
if err != nil {
err = fmt.Errorf("failed to count user view count: %w", err)
return
}
switch arg {
case "page":
stat.PagePV = pv
stat.PageUV = uv
case "site":
stat.SitePV = pv
stat.SiteUV = uv
}
}
}
b, _ := json.Marshal(stat)
w.Header().Set("Content-Type", "application/json")
w.Write(b)
}
// saveVisit saves a visit to storage.
func saveVisit(ctx context.Context, col *mongo.Collection, v *visit) (string, error) {
ctx, cancel := context.WithTimeout(ctx, time.Second*10)
defer cancel()
// if visitor ID does not present, then generate a new visitor ID.
if v.VisitorID == "" {
v.VisitorID = uuid.New().String()
}
_, err := col.InsertOne(ctx, v)
if err != nil {
err = fmt.Errorf("failed to insert record: %w", err)
return "", err
}
return v.VisitorID, nil
}
// countVisit reports the pv and uv of the given hostname collection and path location.
func countVisit(ctx context.Context, col *mongo.Collection, path string, mode string) (pv int64, uv int64, err error) {
ctx, cancel := context.WithTimeout(ctx, time.Second*10)
defer cancel()
switch mode {
case "site":
pv, err = col.CountDocuments(ctx, bson.M{})
if err != nil {
return
}
var result []interface{}
result, err = col.Distinct(ctx, "ip", bson.D{})
if err != nil {
return
}
uv = int64(len(result))
case "page":
pv, err = col.CountDocuments(ctx, bson.M{"path": path})
if err != nil {
return
}
var result []interface{}
result, err = col.Distinct(ctx, "ip", bson.D{
{Key: "path", Value: bson.D{{Key: "$eq", Value: path}}},
})
if err != nil {
return
}
uv = int64(len(result))
}
return
}