package owl import ( "bytes" "errors" "io/ioutil" "net/url" "os" "path" "sort" "sync" "time" "github.com/yuin/goldmark" "github.com/yuin/goldmark/extension" "github.com/yuin/goldmark/parser" "github.com/yuin/goldmark/renderer/html" "gopkg.in/yaml.v2" ) type Post struct { user *User id string title string metaLoaded bool meta PostMeta wmLock sync.Mutex } type PostMeta struct { Title string `yaml:"title"` Aliases []string `yaml:"aliases"` Date time.Time `yaml:"date"` Draft bool `yaml:"draft"` } func (pm PostMeta) FormattedDate() string { return pm.Date.Format("02-01-2006 15:04:05") } func (pm *PostMeta) UnmarshalYAML(unmarshal func(interface{}) error) error { type T struct { Title string `yaml:"title"` Aliases []string `yaml:"aliases"` Draft bool `yaml:"draft"` } type S struct { Date string `yaml:"date"` } var t T var s S if err := unmarshal(&t); err != nil { return err } if err := unmarshal(&s); err != nil { return err } pm.Title = t.Title pm.Aliases = t.Aliases pm.Draft = t.Draft possibleFormats := []string{ "2006-01-02", time.Layout, time.ANSIC, time.UnixDate, time.RubyDate, time.RFC822, time.RFC822Z, time.RFC850, time.RFC1123, time.RFC1123Z, time.RFC3339, time.RFC3339Nano, time.Stamp, time.StampMilli, time.StampMicro, time.StampNano, } for _, format := range possibleFormats { if t, err := time.Parse(format, s.Date); err == nil { pm.Date = t break } } return nil } type PostWebmetions struct { Incoming []WebmentionIn `ymal:"incoming"` Outgoing []WebmentionOut `ymal:"outgoing"` } func (post *Post) Id() string { return post.id } func (post *Post) User() *User { return post.user } func (post *Post) Dir() string { return path.Join(post.user.Dir(), "public", post.id) } func (post *Post) IncomingWebmentionsFile() string { return path.Join(post.Dir(), "incoming_webmentions.yml") } func (post *Post) OutgoingWebmentionsFile() string { return path.Join(post.Dir(), "outgoing_webmentions.yml") } func (post *Post) MediaDir() string { return path.Join(post.Dir(), "media") } func (post *Post) UrlPath() string { return post.user.UrlPath() + "posts/" + post.id + "/" } func (post *Post) FullUrl() string { return post.user.FullUrl() + "posts/" + post.id + "/" } func (post *Post) UrlMediaPath(filename string) string { return post.UrlPath() + "media/" + filename } func (post *Post) Title() string { return post.title } func (post *Post) ContentFile() string { return path.Join(post.Dir(), "index.md") } func (post *Post) Meta() PostMeta { if !post.metaLoaded { post.LoadMeta() } return post.meta } func (post *Post) Content() []byte { // read file data, _ := ioutil.ReadFile(post.ContentFile()) return data } func (post *Post) RenderedContent() bytes.Buffer { data := post.Content() // trim yaml block // TODO this can be done nicer trimmedData := bytes.TrimSpace(data) // check first line is --- if string(trimmedData[0:4]) == "---\n" { trimmedData = trimmedData[4:] // find --- end end := bytes.Index(trimmedData, []byte("\n---\n")) if end != -1 { data = trimmedData[end+5:] } } options := goldmark.WithRendererOptions() if config, _ := post.user.repo.Config(); config.AllowRawHtml { options = goldmark.WithRendererOptions( html.WithUnsafe(), ) } markdown := goldmark.New( options, goldmark.WithExtensions( // meta.Meta, extension.GFM, ), ) var buf bytes.Buffer context := parser.NewContext() if err := markdown.Convert(data, &buf, parser.WithContext(context)); err != nil { panic(err) } return buf } func (post *Post) Aliases() []string { return post.Meta().Aliases } func (post *Post) LoadMeta() error { data := post.Content() // get yaml metadata block meta := PostMeta{} trimmedData := bytes.TrimSpace(data) // check first line is --- if string(trimmedData[0:4]) == "---\n" { trimmedData = trimmedData[4:] // find --- end end := bytes.Index(trimmedData, []byte("\n---\n")) if end != -1 { metaData := trimmedData[:end] err := yaml.Unmarshal(metaData, &meta) if err != nil { return err } } } post.meta = meta return nil } func (post *Post) IncomingWebmentions() []WebmentionIn { // return parsed webmentions fileName := post.IncomingWebmentionsFile() if !fileExists(fileName) { return []WebmentionIn{} } data, err := os.ReadFile(fileName) if err != nil { return []WebmentionIn{} } webmentions := []WebmentionIn{} err = yaml.Unmarshal(data, &webmentions) if err != nil { return []WebmentionIn{} } return webmentions } func (post *Post) OutgoingWebmentions() []WebmentionOut { // return parsed webmentions fileName := post.OutgoingWebmentionsFile() if !fileExists(fileName) { return []WebmentionOut{} } data, err := os.ReadFile(fileName) if err != nil { return []WebmentionOut{} } webmentions := []WebmentionOut{} err = yaml.Unmarshal(data, &webmentions) if err != nil { return []WebmentionOut{} } return webmentions } // PersistWebmentionOutgoing persists incoming webmention func (post *Post) PersistIncomingWebmention(webmention WebmentionIn) error { post.wmLock.Lock() defer post.wmLock.Unlock() wms := post.IncomingWebmentions() // if target is not in status, add it replaced := false for i, t := range wms { if t.Source == webmention.Source { wms[i].UpdateWith(webmention) replaced = true break } } if !replaced { wms = append(wms, webmention) } data, err := yaml.Marshal(wms) if err != nil { return err } err = os.WriteFile(post.IncomingWebmentionsFile(), data, 0644) if err != nil { return err } return nil } // PersistOutgoingWebmention persists a webmention to the webmention file. func (post *Post) PersistOutgoingWebmention(webmention *WebmentionOut) error { post.wmLock.Lock() defer post.wmLock.Unlock() wms := post.OutgoingWebmentions() // if target is not in webmention, add it replaced := false for i, t := range wms { if t.Target == webmention.Target { wms[i].UpdateWith(*webmention) replaced = true break } } if !replaced { wms = append(wms, *webmention) } data, err := yaml.Marshal(wms) if err != nil { return err } err = os.WriteFile(post.OutgoingWebmentionsFile(), data, 0644) if err != nil { return err } return nil } func (post *Post) AddIncomingWebmention(source string) error { // Check if file already exists wm := WebmentionIn{ Source: source, } defer func() { go post.EnrichWebmention(wm) }() return post.PersistIncomingWebmention(wm) } func (post *Post) EnrichWebmention(webmention WebmentionIn) error { resp, err := post.user.repo.HttpClient.Get(webmention.Source) if err == nil { entry, err := post.user.repo.Parser.ParseHEntry(resp) if err == nil { webmention.Title = entry.Title return post.PersistIncomingWebmention(webmention) } } return err } func (post *Post) ApprovedIncomingWebmentions() []WebmentionIn { webmentions := post.IncomingWebmentions() approved := []WebmentionIn{} for _, webmention := range webmentions { if webmention.ApprovalStatus == "approved" { approved = append(approved, webmention) } } // sort by retrieved date sort.Slice(approved, func(i, j int) bool { return approved[i].RetrievedAt.After(approved[j].RetrievedAt) }) return approved } // ScanForLinks scans the post content for links and adds them to the // `status.yml` file for the post. The links are not scanned by this function. func (post *Post) ScanForLinks() error { // this could be done in markdown parsing, but I don't want to // rely on goldmark for this (yet) postHtml := post.RenderedContent() links, _ := post.user.repo.Parser.ParseLinksFromString(postHtml.String()) for _, link := range links { post.PersistOutgoingWebmention(&WebmentionOut{ Target: link, }) } return nil } func (post *Post) SendWebmention(webmention WebmentionOut) error { defer post.PersistOutgoingWebmention(&webmention) // if last scan is less than 7 days ago, don't send webmention if webmention.ScannedAt.After(time.Now().Add(-7*24*time.Hour)) && !webmention.Supported { return errors.New("did not scan. Last scan was less than 7 days ago") } webmention.ScannedAt = time.Now() resp, err := post.user.repo.HttpClient.Get(webmention.Target) if err != nil { webmention.Supported = false return err } endpoint, err := post.user.repo.Parser.GetWebmentionEndpoint(resp) if err != nil { webmention.Supported = false return err } webmention.Supported = true // send webmention payload := url.Values{} payload.Set("source", post.FullUrl()) payload.Set("target", webmention.Target) _, err = post.user.repo.HttpClient.PostForm(endpoint, payload) if err != nil { return err } // update webmention status webmention.LastSentAt = time.Now() return nil }