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131 lines
3.2 KiB
131 lines
3.2 KiB
package main
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import (
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"fmt"
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"io"
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"log"
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"net/http"
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"net/url"
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"strings"
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"github.com/PuerkitoBio/goquery"
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"github.com/tomnomnom/linkheader"
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)
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func (p *post) sendWebmentions() error {
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links := []string{}
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contentLinks, err := allLinksFromHTML(strings.NewReader(string(p.html())), p.fullURL())
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if err != nil {
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return err
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}
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links = append(links, contentLinks...)
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links = append(links, p.firstParameter(appConfig.Micropub.LikeParam), p.firstParameter(appConfig.Micropub.ReplyParam), p.firstParameter(appConfig.Micropub.BookmarkParam))
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for _, link := range links {
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if link == "" {
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continue
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}
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if strings.HasPrefix(link, appConfig.Server.PublicAddress) {
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// Save mention directly
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createWebmention(p.fullURL(), link)
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continue
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}
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endpoint := discoverEndpoint(link)
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if endpoint == "" {
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continue
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}
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_, err = sendWebmention(endpoint, p.fullURL(), link)
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if err != nil {
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log.Println("Sending webmention to " + link + " failed")
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continue
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}
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log.Println("Sent webmention to " + link)
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}
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return nil
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}
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func sendWebmention(endpoint, source, target string) (*http.Response, error) {
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req, err := http.NewRequest(http.MethodPost, endpoint, strings.NewReader(url.Values{
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"source": []string{source},
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"target": []string{target},
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}.Encode()))
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if err != nil {
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return nil, err
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}
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req.Header.Set(contentType, contentTypeWWWForm)
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req.Header.Set(userAgent, appUserAgent)
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res, err := http.DefaultClient.Do(req)
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if err != nil {
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return res, err
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}
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if code := res.StatusCode; code < 200 || 300 <= code {
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return res, fmt.Errorf("response error: %v", res.StatusCode)
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}
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return res, nil
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}
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func discoverEndpoint(urlStr string) string {
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doRequest := func(method, urlStr string) string {
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req, err := http.NewRequest(method, urlStr, nil)
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if err != nil {
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return ""
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}
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req.Header.Set(userAgent, appUserAgent)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return ""
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}
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if code := resp.StatusCode; code < 200 || 300 <= code {
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return ""
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}
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defer resp.Body.Close()
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endpoint, err := extractEndpoint(resp)
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if err != nil || endpoint == "" {
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return ""
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}
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if urls, err := resolveURLReferences(urlStr, endpoint); err == nil && len(urls) > 0 && urls[0] != "" {
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return urls[0]
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}
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return ""
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}
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headEndpoint := doRequest(http.MethodHead, urlStr)
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if headEndpoint != "" {
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return headEndpoint
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}
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getEndpoint := doRequest(http.MethodGet, urlStr)
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if getEndpoint != "" {
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return getEndpoint
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}
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return ""
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}
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func extractEndpoint(resp *http.Response) (string, error) {
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// first check http link headers
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if endpoint := wmEndpointHTTPLink(resp.Header); endpoint != "" {
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return endpoint, nil
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}
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// then look in the HTML body
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endpoint, err := wmEndpointHTMLLink(resp.Body)
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if err != nil {
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return "", err
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}
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return endpoint, nil
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}
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func wmEndpointHTTPLink(headers http.Header) string {
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links := linkheader.ParseMultiple(headers[http.CanonicalHeaderKey("Link")]).FilterByRel("webmention")
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for _, link := range links {
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if u := link.URL; u != "" {
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return u
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}
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}
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return ""
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}
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func wmEndpointHTMLLink(r io.Reader) (string, error) {
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doc, err := goquery.NewDocumentFromReader(r)
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if err != nil {
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return "", err
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}
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href, _ := doc.Find("a[href][rel=webmention],link[href][rel=webmention]").Attr("href")
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return href, nil
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}
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