148 lines
3.9 KiB
Go
148 lines
3.9 KiB
Go
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package webmention
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import (
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"crypto/md5"
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"encoding/json"
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"fmt"
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"github.com/wgroeneveld/go-jamming/common"
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"github.com/wgroeneveld/go-jamming/rest"
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"io/fs"
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"io/ioutil"
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"net/url"
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"os"
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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 Mention struct {
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Source string
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Target string
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}
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func (wm *Mention) String() string {
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return fmt.Sprintf("source: %s, target: %s", wm.Source, wm.Target)
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}
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func (wm *Mention) asPath(conf *common.Config) string {
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filename := fmt.Sprintf("%x", md5.Sum([]byte("source=" + wm.Source+ ",target=" + wm.Target)))
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domain, _ := conf.FetchDomain(wm.Target)
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return conf.DataPath + "/" + domain + "/" + filename + ".json"
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}
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func (wm *Mention) sourceUrl() *url.URL {
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url, _ := url.Parse(wm.Source)
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return url
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}
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// used as a "class" to iject dependencies, just to be able to test. Do NOT like htis.
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// Is there a better way? e.g. in validate, I just pass rest.Client as an arg. Not great either.
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type Receiver struct {
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RestClient rest.Client
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Conf *common.Config
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}
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func (recv *Receiver) Receive(wm Mention) {
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log.Info().Str("Webmention", wm.String()).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().Str("source", wm.Source).Msg(" ABORT: invalid url")
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recv.deletePossibleOlderWebmention(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) deletePossibleOlderWebmention(wm Mention) {
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os.Remove(wm.asPath(recv.Conf))
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}
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func getHEntry(data *microformats.Data) *microformats.Microformat {
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for _, itm := range data.Items {
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if common.Includes(itm.Type, "h-entry") {
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return itm
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}
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}
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return nil
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}
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func (recv *Receiver) processSourceBody(body string, wm 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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data := microformats.Parse(strings.NewReader(body), wm.sourceUrl())
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indieweb := recv.convertBodyToIndiewebData(body, wm, getHEntry(data))
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recv.saveWebmentionToDisk(wm, indieweb)
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log.Info().Str("file", wm.asPath(recv.Conf)).Msg("OK: Webmention processed.")
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}
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func (recv *Receiver) convertBodyToIndiewebData(body string, wm Mention, hEntry *microformats.Microformat) *indiewebData {
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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, wm)
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}
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func (recv *Receiver) saveWebmentionToDisk(wm Mention, indieweb *indiewebData) {
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jsonData, jsonErr := json.Marshal(indieweb)
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if jsonErr != nil {
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log.Err(jsonErr).Msg("Unable to serialize Webmention into JSON")
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}
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err := ioutil.WriteFile(wm.asPath(recv.Conf), jsonData, fs.ModePerm)
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if err != nil {
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log.Err(err).Msg("Unable to save Webmention to disk")
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}
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}
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// TODO I'm smelling very unstable code, apply https://golang.org/doc/effective_go#recover here?
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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, wm Mention) *indiewebData {
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name := mfStr(hEntry, "name")
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pic := mfStr(mfProp(hEntry, "author"), "photo")
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mfType := determineMfType(hEntry)
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return &indiewebData{
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Name: name,
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Author: indiewebAuthor{
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Name: determineAuthorName(hEntry),
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Picture: pic,
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},
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Content: determineContent(hEntry),
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Url: determineUrl(hEntry, wm.Source),
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Published: determinePublishedDate(hEntry, recv.Conf.UtcOffset),
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Source: wm.Source,
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Target: wm.Target,
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IndiewebType: mfType,
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}
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}
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func (recv *Receiver) parseBodyAsNonIndiewebSite(body string, wm Mention) *indiewebData {
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r := regexp.MustCompile(`<title>(.*?)<\/title>`)
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titleMatch := r.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 &indiewebData{
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Author: 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: publishedNow(recv.Conf.UtcOffset),
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Url: wm.Source,
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IndiewebType: "mention",
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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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