Simple blogging system written in Go https://goblog.app
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package main
import (
"bytes"
"encoding/gob"
"errors"
"fmt"
"io"
"log"
"net/http"
"net/url"
"strings"
"time"
"github.com/PuerkitoBio/goquery"
"github.com/thoas/go-funk"
"go.goblog.app/app/pkgs/contenttype"
"willnorris.com/go/microformats"
)
func (a *goBlog) initWebmentionQueue() {
go func() {
for {
qi, err := a.db.peekQueue("wm")
if err != nil {
log.Println(err.Error())
continue
} else if qi != nil {
var m mention
err = gob.NewDecoder(bytes.NewReader(qi.content)).Decode(&m)
if err != nil {
log.Println(err.Error())
_ = a.db.dequeue(qi)
continue
}
err = a.verifyMention(&m)
if err != nil {
log.Println(fmt.Sprintf("Failed to verify webmention from %s to %s: %s", m.Source, m.Target, err.Error()))
}
err = a.db.dequeue(qi)
if err != nil {
log.Println(err.Error())
}
} else {
// No item in the queue, wait a moment
time.Sleep(15 * time.Second)
}
}
}()
}
func (a *goBlog) queueMention(m *mention) error {
if wm := a.cfg.Webmention; wm != nil && wm.DisableReceiving {
return errors.New("webmention receiving disabled")
}
var buf bytes.Buffer
if err := gob.NewEncoder(&buf).Encode(m); err != nil {
return err
}
return a.db.enqueue("wm", buf.Bytes(), time.Now())
}
func (a *goBlog) verifyMention(m *mention) error {
// Request target
targetReq, err := http.NewRequest(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
}
// 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.NewRequest(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())
} else {
sourceReq.Header.Set(userAgent, appUserAgent)
sourceResp, err = a.httpClient.Do(sourceReq)
}
if err != nil {
return err
}
// 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)
_ = sourceResp.Body.Close()
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)
}
if cr := []rune(m.Content); len(cr) > 500 {
m.Content = string(cr[0:497]) + "…"
}
if tr := []rune(m.Title); len(tr) > 60 {
m.Title = string(tr[0:57]) + "…"
}
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 {
var linksBuffer, gqBuffer, mfBuffer bytes.Buffer
if _, err := io.Copy(io.MultiWriter(&linksBuffer, &gqBuffer, &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 := funk.FindString(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.NewRequest(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
}
if resp.StatusCode == http.StatusOK && unescapedPath(resp.Request.URL.String()) == unescapedPath(defaultIfEmpty(m.NewTarget, m.Target)) {
return true
}
return false
}); !hasLink {
return errors.New("target not found in source")
}
// Fill mention attributes
sourceURL, err := url.Parse(defaultIfEmpty(m.NewSource, m.Source))
if err != nil {
return err
}
m.Title = ""
m.Content = ""
m.Author = ""
m.Url = ""
m.hasUrl = false
m.fillFromData(microformats.Parse(&mfBuffer, sourceURL))
if m.Url == "" {
m.Url = m.Source
}
// Set title when content is empty as well
if m.Title == "" && m.Content == "" {
doc, err := goquery.NewDocumentFromReader(&gqBuffer)
if err != nil {
return err
}
if title := doc.Find("title"); title != nil {
m.Title = title.Text()
}
}
return nil
}
func (m *mention) fillFromData(mf *microformats.Data) {
// Fill data
for _, i := range mf.Items {
if m.fill(i) {
break
}
}
}
func (m *mention) fill(mf *microformats.Microformat) bool {
if mfHasType(mf, "h-entry") {
// Check URL
if url, ok := mf.Properties["url"]; ok && len(url) > 0 {
if url0, ok := url[0].(string); ok {
if strings.EqualFold(url0, defaultIfEmpty(m.NewSource, m.Source)) {
// Is searched entry
m.hasUrl = true
m.Url = url0
// Reset attributes to refill
m.Author = ""
m.Title = ""
m.Content = ""
} else if m.hasUrl {
// Already found entry
return false
} else if m.Url == "" {
// Is the first entry
m.Url = url0
} else {
// Is not the first entry
return false
}
}
}
// Title
m.fillTitle(mf)
// Content
m.fillContent(mf)
// Author
m.fillAuthor(mf)
return m.hasUrl
}
for _, mfc := range mf.Children {
if m.fill(mfc) {
return true
}
}
return false
}
func (m *mention) fillTitle(mf *microformats.Microformat) {
if m.Title != "" {
return
}
if name, ok := mf.Properties["name"]; ok && len(name) > 0 {
if title, ok := name[0].(string); ok {
m.Title = strings.TrimSpace(title)
}
}
}
func (m *mention) fillContent(mf *microformats.Microformat) {
if m.Content != "" {
return
}
if contents, ok := mf.Properties["content"]; ok && len(contents) > 0 {
if content, ok := contents[0].(map[string]string); ok {
if contentHTML, ok := content["html"]; ok {
m.Content = cleanHTMLText(contentHTML)
// Replace newlines with spaces
m.Content = strings.ReplaceAll(m.Content, "\n", " ")
// Collapse double spaces
m.Content = strings.Join(strings.Fields(m.Content), " ")
// Trim spaces
m.Content = strings.TrimSpace(m.Content)
}
}
}
}
func (m *mention) fillAuthor(mf *microformats.Microformat) {
if m.Author != "" {
return
}
if authors, ok := mf.Properties["author"]; ok && len(authors) > 0 {
if author, ok := authors[0].(*microformats.Microformat); ok {
if names, ok := author.Properties["name"]; ok && len(names) > 0 {
if name, ok := names[0].(string); ok {
m.Author = strings.TrimSpace(name)
}
}
}
}
}
func mfHasType(mf *microformats.Microformat, typ string) bool {
for _, t := range mf.Type {
if typ == t {
return true
}
}
return false
}