forked from wgroeneveld/go-jamming
188 lines
5.7 KiB
Go
188 lines
5.7 KiB
Go
package recv
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import (
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"brainbaking.com/go-jamming/app/mf"
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"brainbaking.com/go-jamming/app/notifier"
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"brainbaking.com/go-jamming/common"
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"brainbaking.com/go-jamming/db"
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"brainbaking.com/go-jamming/rest"
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"errors"
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"fmt"
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"regexp"
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"strings"
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"github.com/rs/zerolog/log"
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"willnorris.com/go/microformats"
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)
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type Receiver struct {
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RestClient rest.Client
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Notifier notifier.Notifier
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Conf *common.Config
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Repo db.MentionRepo
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}
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var (
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titleRegexp = regexp.MustCompile(`<title>(.*?)<\/title>`)
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errPicUnableToDownload = errors.New("Unable to download author picture")
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errPicNoRealImage = errors.New("Downloaded author picture is not a real image")
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errPicUnableToSave = errors.New("Unable to save downloaded author picture")
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errWontDownloadBecauseOfPrivacy = errors.New("Will not save locally because it's form a silo domain")
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)
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func (recv *Receiver) Receive(wm mf.Mention) {
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if recv.Conf.IsBlacklisted(wm.Source) {
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log.Warn().Stringer("wm", wm).Msg(" ABORT: source url comes from blacklisted domain!")
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return
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}
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log.Info().Stringer("wm", wm).Msg("OK: looks valid")
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_, body, geterr := recv.RestClient.GetBody(wm.Source)
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if geterr != nil {
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log.Warn().Err(geterr).Msg(" ABORT: invalid url")
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recv.Repo.Delete(wm)
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return
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}
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recv.processSourceBody(body, wm)
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}
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func (recv *Receiver) processSourceBody(body string, wm mf.Mention) {
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if !strings.Contains(body, wm.Target) {
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log.Warn().Str("target", wm.Target).Msg("ABORT: no mention of target found in html src of source!")
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return
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}
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defer func() {
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if r := recover(); r != nil {
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log.Error().Str("panic", fmt.Sprintf("%q", r)).Stringer("wm", wm).Msg("ABORT: panic recovery while processing wm")
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}
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}()
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data := microformats.Parse(strings.NewReader(body), wm.SourceUrl())
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indieweb := recv.convertBodyToIndiewebData(body, wm, data)
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recv.processAuthorPicture(indieweb)
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if recv.Conf.IsWhitelisted(wm.Source) {
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recv.processWhitelistedMention(wm, indieweb)
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} else {
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recv.processMentionInModeration(wm, indieweb)
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}
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}
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func (recv *Receiver) processMentionInModeration(wm mf.Mention, indieweb *mf.IndiewebData) {
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key, err := recv.Repo.InModeration(wm, indieweb)
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if err != nil {
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log.Error().Err(err).Stringer("wm", wm).Msg("Failed to save new mention to in moderation db")
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}
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err = recv.Notifier.NotifyInModeration(wm, indieweb)
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if err != nil {
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log.Error().Err(err).Msg("Failed to notify")
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}
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log.Info().Str("key", key).Msg("OK: Webmention processed, in moderation.")
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}
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func (recv *Receiver) processWhitelistedMention(wm mf.Mention, indieweb *mf.IndiewebData) {
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key, err := recv.Repo.Save(wm, indieweb)
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if err != nil {
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log.Error().Err(err).Stringer("wm", wm).Msg("Failed to save new mention to db")
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}
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err = recv.Notifier.NotifyReceived(wm, indieweb)
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if err != nil {
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log.Error().Err(err).Msg("Failed to notify")
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}
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log.Info().Str("key", key).Msg("OK: Webmention processed, in whitelist.")
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}
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func (recv *Receiver) processAuthorPicture(indieweb *mf.IndiewebData) {
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if indieweb.Author.Picture != "" {
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err := recv.saveAuthorPictureLocally(indieweb)
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if err != nil {
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log.Error().Err(err).Str("url", indieweb.Author.Picture).Msg("Failed to save picture. Reverting to anonymous")
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indieweb.Author.AnonymizePicture()
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if err == errWontDownloadBecauseOfPrivacy {
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indieweb.Author.AnonymizeName()
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}
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}
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} else {
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indieweb.Author.AnonymizePicture()
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}
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}
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func (recv *Receiver) convertBodyToIndiewebData(body string, wm mf.Mention, mfRoot *microformats.Data) *mf.IndiewebData {
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hEntry := mf.HEntry(mfRoot)
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hCard := mf.HCard(mfRoot)
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if hEntry == nil {
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return recv.parseBodyAsNonIndiewebSite(body, wm)
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}
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return recv.parseBodyAsIndiewebSite(hEntry, hCard, wm)
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}
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// see https://github.com/willnorris/microformats/blob/main/microformats.go
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func (recv *Receiver) parseBodyAsIndiewebSite(hEntry *microformats.Microformat, hCard *microformats.Microformat, wm mf.Mention) *mf.IndiewebData {
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return &mf.IndiewebData{
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Name: mf.Str(hEntry, "name"),
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Author: mf.NewAuthor(hEntry, hCard),
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Content: mf.Content(hEntry),
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Url: mf.Url(hEntry, wm.Source),
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Published: mf.Published(hEntry),
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Source: wm.Source,
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Target: wm.Target,
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IndiewebType: mf.Type(hEntry),
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}
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}
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func (recv *Receiver) parseBodyAsNonIndiewebSite(body string, wm mf.Mention) *mf.IndiewebData {
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title := nonIndiewebTitle(body, wm)
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return &mf.IndiewebData{
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Author: mf.IndiewebAuthor{
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Name: wm.Source,
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},
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Name: title,
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Content: title,
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Published: mf.PublishedNow(),
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Url: wm.Source,
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IndiewebType: mf.TypeMention,
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Source: wm.Source,
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Target: wm.Target,
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}
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}
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// saveAuthorPictureLocally tries to download the author picture and checks if it's valid based on img header.
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// If it succeeds, it alters the picture path to a local /pictures/x one.
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// If it fails, it returns an error.
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// This refuses to download from silo sources such as brid.gy because of privacy concerns.
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func (recv *Receiver) saveAuthorPictureLocally(indieweb *mf.IndiewebData) error {
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srcDomain := rest.Domain(indieweb.Source)
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if common.Includes(rest.SiloDomains, srcDomain) {
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return errWontDownloadBecauseOfPrivacy
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}
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_, picData, err := recv.RestClient.GetBody(indieweb.Author.Picture)
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if err != nil {
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return errPicUnableToDownload
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}
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if len(picData) < 8 || !rest.IsRealImage([]byte(picData[0:8])) {
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return errPicNoRealImage
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}
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_, dberr := recv.Repo.SavePicture(picData, srcDomain)
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if dberr != nil {
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return errPicUnableToSave
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}
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indieweb.Author.Picture = fmt.Sprintf("/pictures/%s", srcDomain)
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return nil
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}
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func nonIndiewebTitle(body string, wm mf.Mention) string {
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titleMatch := titleRegexp.FindStringSubmatch(body)
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title := wm.Source
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if titleMatch != nil {
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title = titleMatch[1]
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}
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return title
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}
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