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