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GoBlog/webmentionVerification.go

188 lines
5.4 KiB

package main
import (
"bytes"
"context"
"encoding/gob"
"errors"
"fmt"
"io"
"log"
"net/http"
"strings"
"time"
"github.com/samber/lo"
"go.goblog.app/app/pkgs/bufferpool"
"go.goblog.app/app/pkgs/contenttype"
)
func (a *goBlog) initWebmentionQueue() {
a.listenOnQueue("wm", 30*time.Second, func(qi *queueItem, dequeue func(), reschedule func(time.Duration)) {
var m mention
if err := gob.NewDecoder(bytes.NewReader(qi.content)).Decode(&m); err != nil {
log.Println("webmention queue:", err.Error())
dequeue()
return
}
if err := a.verifyMention(&m); err != nil {
log.Printf("Failed to verify webmention from %s to %s: %s", m.Source, m.Target, err.Error())
}
dequeue()
})
}
func (a *goBlog) queueMention(m *mention) error {
if wm := a.cfg.Webmention; wm != nil && wm.DisableReceiving {
return errors.New("webmention receiving disabled")
}
buf := bufferpool.Get()
defer bufferpool.Put(buf)
if err := gob.NewEncoder(buf).Encode(m); err != nil {
return err
}
return a.enqueue("wm", buf.Bytes(), time.Now())
}
func (a *goBlog) verifyMention(m *mention) error {
// Request target
targetReq, err := http.NewRequestWithContext(context.Background(), http.MethodGet, m.Target, nil)
if err != nil {
return err
}
targetReq.Header.Set("Accept", contenttype.HTMLUTF8)
setLoggedIn(targetReq, true)
targetResp, err := doHandlerRequest(targetReq, a.getAppRouter())
if err != nil {
return err
}
_ = targetResp.Body.Close()
// Check if target has a valid status code
if targetResp.StatusCode != http.StatusOK {
if a.cfg.Debug {
a.debug(fmt.Sprintf("Webmention for unknown path: %s", m.Target))
}
return a.db.deleteWebmention(m)
}
// Check if target has a redirect
if respReq := targetResp.Request; respReq != nil {
if ru := respReq.URL; m.Target != ru.String() {
m.NewTarget = ru.String()
}
}
// Request source
sourceReq, err := http.NewRequestWithContext(context.Background(), http.MethodGet, m.Source, nil)
if err != nil {
return err
}
sourceReq.Header.Set("Accept", contenttype.HTMLUTF8)
var sourceResp *http.Response
if strings.HasPrefix(m.Source, a.cfg.Server.PublicAddress) ||
(a.cfg.Server.ShortPublicAddress != "" && strings.HasPrefix(m.Source, a.cfg.Server.ShortPublicAddress)) {
setLoggedIn(sourceReq, true)
sourceResp, err = doHandlerRequest(sourceReq, a.getAppRouter())
if err != nil {
return err
}
defer sourceResp.Body.Close()
} else {
sourceResp, err = a.httpClient.Do(sourceReq)
if err != nil {
return err
}
defer sourceResp.Body.Close()
}
// Check if source has a valid status code
if sourceResp.StatusCode != http.StatusOK {
if a.cfg.Debug {
a.debug(fmt.Sprintf("Delete webmention because source doesn't have valid status code: %s", m.Source))
}
return a.db.deleteWebmention(m)
}
// Check if source has a redirect
if respReq := sourceResp.Request; respReq != nil {
if ru := respReq.URL; m.Source != ru.String() {
m.NewSource = ru.String()
}
}
// Parse response body
err = a.verifyReader(m, sourceResp.Body)
if err != nil {
if a.cfg.Debug {
a.debug(fmt.Sprintf("Delete webmention because verifying %s threw error: %s", m.Source, err.Error()))
}
return a.db.deleteWebmention(m)
}
newStatus := webmentionStatusVerified
// Update or insert webmention
if a.db.webmentionExists(m) {
if a.cfg.Debug {
a.debug(fmt.Sprintf("Update webmention: %s => %s", m.Source, m.Target))
}
// Update webmention
err = a.db.updateWebmention(m, newStatus)
if err != nil {
return err
}
} else {
if m.NewSource != "" {
m.Source = m.NewSource
}
if m.NewTarget != "" {
m.Target = m.NewTarget
}
err = a.db.insertWebmention(m, newStatus)
if err != nil {
return err
}
a.sendNotification(fmt.Sprintf("New webmention from %s to %s", defaultIfEmpty(m.NewSource, m.Source), defaultIfEmpty(m.NewTarget, m.Target)))
}
return err
}
func (a *goBlog) verifyReader(m *mention, body io.Reader) error {
linksBuffer, mfBuffer := bufferpool.Get(), bufferpool.Get()
defer bufferpool.Put(linksBuffer, mfBuffer)
if _, err := io.Copy(io.MultiWriter(linksBuffer, mfBuffer), body); err != nil {
return err
}
// Check if source mentions target
links, err := allLinksFromHTML(linksBuffer, defaultIfEmpty(m.NewSource, m.Source))
if err != nil {
return err
}
if _, hasLink := lo.Find(links, func(s string) bool {
// Check if link belongs to installation
hasShortPrefix := a.cfg.Server.ShortPublicAddress != "" && strings.HasPrefix(s, a.cfg.Server.ShortPublicAddress)
hasLongPrefix := strings.HasPrefix(s, a.cfg.Server.PublicAddress)
if !hasShortPrefix && !hasLongPrefix {
return false
}
// Check if link is or redirects to target
req, err := http.NewRequestWithContext(context.Background(), http.MethodGet, m.Target, nil)
if err != nil {
return false
}
req.Header.Set("Accept", contenttype.HTMLUTF8)
setLoggedIn(req, true)
resp, err := doHandlerRequest(req, a.getAppRouter())
if err != nil {
return false
}
_ = resp.Body.Close()
if resp.StatusCode == http.StatusOK && lowerUnescapedPath(resp.Request.URL.String()) == lowerUnescapedPath(defaultIfEmpty(m.NewTarget, m.Target)) {
return true
}
return false
}); !hasLink {
return errors.New("target not found in source")
}
// Fill mention attributes
mf, err := parseMicroformatsFromReader(defaultIfEmpty(m.NewSource, m.Source), mfBuffer)
if err != nil {
return err
}
m.Title, m.Content, m.Author, m.Url = mf.Title, mf.Content, mf.Author, defaultIfEmpty(mf.Url, m.Source)
return nil
}