From 529bf932b84c1f902afddd6d0548d42badf2d6ef Mon Sep 17 00:00:00 2001
From: wgroeneveld <wouter@brainbaking.com>
Date: Sun, 25 Apr 2021 15:11:16 +0200
Subject: [PATCH] fix unable to receive wm from wordpress-wm plugin with
 unusual author hcard microformat

---
 app/mf/microformats.go                       |  54 ++-
 app/webmention/recv/receive.go               |  17 +-
 app/webmention/recv/receive_test.go          |   8 +
 mocks/bugfix-interface-conversion-panic.html | 355 +++++++++++++++++++
 4 files changed, 420 insertions(+), 14 deletions(-)
 create mode 100644 mocks/bugfix-interface-conversion-panic.html

diff --git a/app/mf/microformats.go b/app/mf/microformats.go
index cfcd18d..fdef9e6 100644
--- a/app/mf/microformats.go
+++ b/app/mf/microformats.go
@@ -109,22 +109,40 @@ func Map(mf *microformats.Microformat, key string) map[string]string {
 }
 
 func HEntry(data *microformats.Data) *microformats.Microformat {
+	return hItemType(data, "h-entry")
+}
+
+func HCard(data *microformats.Data) *microformats.Microformat {
+	return hItemType(data, "h-card")
+}
+
+func hItemType(data *microformats.Data, hType string) *microformats.Microformat {
 	for _, itm := range data.Items {
-		if common.Includes(itm.Type, "h-entry") {
+		if common.Includes(itm.Type, hType) {
 			return itm
 		}
 	}
 	return nil
 }
 
+func mfEmpty() *microformats.Microformat {
+	return &microformats.Microformat{
+		Properties: map[string][]interface{}{},
+	}
+}
+
 func Prop(mf *microformats.Microformat, key string) *microformats.Microformat {
 	val := mf.Properties[key]
 	if len(val) == 0 {
-		return &microformats.Microformat{
-			Properties: map[string][]interface{}{},
+		return mfEmpty()
+	}
+	for i := range val {
+		conv, ok := val[i].(*microformats.Microformat)
+		if ok {
+			return conv
 		}
 	}
-	return val[0].(*microformats.Microformat)
+	return mfEmpty()
 }
 
 func Published(hEntry *microformats.Microformat, utcOffset int) string {
@@ -135,10 +153,36 @@ func Published(hEntry *microformats.Microformat, utcOffset int) string {
 	return publishedDate
 }
 
+func NewAuthor(hEntry *microformats.Microformat, hCard *microformats.Microformat) IndiewebAuthor {
+	name := DetermineAuthorName(hEntry)
+	if name == "" {
+		name = DetermineAuthorName(hCard)
+	}
+	picture := DetermineAuthorPhoto(hEntry)
+	if picture == "" {
+		picture = DetermineAuthorPhoto(hCard)
+	}
+	return IndiewebAuthor{
+		Picture: picture,
+		Name:    name,
+	}
+}
+
+func DetermineAuthorPhoto(hEntry *microformats.Microformat) string {
+	photo := Str(Prop(hEntry, "author"), "photo")
+	if photo == "" {
+		photo = Str(hEntry, "photo")
+	}
+	return photo
+}
+
 func DetermineAuthorName(hEntry *microformats.Microformat) string {
 	authorName := Str(Prop(hEntry, "author"), "name")
 	if authorName == "" {
-		return Prop(hEntry, "author").Value
+		authorName = Prop(hEntry, "author").Value
+	}
+	if authorName == "" {
+		authorName = Str(hEntry, "author")
 	}
 	return authorName
 }
diff --git a/app/webmention/recv/receive.go b/app/webmention/recv/receive.go
index 27a82c4..6f133af 100644
--- a/app/webmention/recv/receive.go
+++ b/app/webmention/recv/receive.go
@@ -48,7 +48,7 @@ func (recv *Receiver) processSourceBody(body string, wm mf.Mention) {
 	}
 
 	data := microformats.Parse(strings.NewReader(body), wm.SourceUrl())
-	indieweb := recv.convertBodyToIndiewebData(body, wm, mf.HEntry(data))
+	indieweb := recv.convertBodyToIndiewebData(body, wm, data)
 	if indieweb.Author.Picture != "" {
 		err := recv.saveAuthorPictureLocally(indieweb)
 		if err != nil {
@@ -64,21 +64,20 @@ func (recv *Receiver) processSourceBody(body string, wm mf.Mention) {
 	log.Info().Str("key", key).Msg("OK: Webmention processed.")
 }
 
-func (recv *Receiver) convertBodyToIndiewebData(body string, wm mf.Mention, hEntry *microformats.Microformat) *mf.IndiewebData {
+func (recv *Receiver) convertBodyToIndiewebData(body string, wm mf.Mention, mfRoot *microformats.Data) *mf.IndiewebData {
+	hEntry := mf.HEntry(mfRoot)
+	hCard := mf.HCard(mfRoot)
 	if hEntry == nil {
 		return recv.parseBodyAsNonIndiewebSite(body, wm)
 	}
-	return recv.parseBodyAsIndiewebSite(hEntry, wm)
+	return recv.parseBodyAsIndiewebSite(hEntry, hCard, wm)
 }
 
 // see https://github.com/willnorris/microformats/blob/main/microformats.go
-func (recv *Receiver) parseBodyAsIndiewebSite(hEntry *microformats.Microformat, wm mf.Mention) *mf.IndiewebData {
+func (recv *Receiver) parseBodyAsIndiewebSite(hEntry *microformats.Microformat, hCard *microformats.Microformat, wm mf.Mention) *mf.IndiewebData {
 	return &mf.IndiewebData{
-		Name: mf.Str(hEntry, "name"),
-		Author: mf.IndiewebAuthor{
-			Name:    mf.DetermineAuthorName(hEntry),
-			Picture: mf.Str(mf.Prop(hEntry, "author"), "photo"),
-		},
+		Name:         mf.Str(hEntry, "name"),
+		Author:       mf.NewAuthor(hEntry, hCard),
 		Content:      mf.Content(hEntry),
 		Url:          mf.Url(hEntry, wm.Source),
 		Published:    mf.Published(hEntry, recv.Conf.UtcOffset),
diff --git a/app/webmention/recv/receive_test.go b/app/webmention/recv/receive_test.go
index 42f0d05..86d3d53 100644
--- a/app/webmention/recv/receive_test.go
+++ b/app/webmention/recv/receive_test.go
@@ -112,6 +112,14 @@ func TestReceive(t *testing.T) {
 		wm    mf.Mention
 		json  string
 	}{
+		{
+			label: "bugfix interface conversion panic unusual author part in mf",
+			wm: mf.Mention{
+				Source: "https://brainbaking.com/bugfix-interface-conversion-panic.html",
+				Target: "https://brainbaking.com/",
+			},
+			json: `{"author":{"name":"Ton Zijlstra","picture":"/pictures/brainbaking.com"},"name":"","content":"De allereerste Nederlandstalige meet-up van Obsidian.md gebruikers was interessant en leuk! We waren met z’n vieren, Sebastiaan, Wouter, Frank en ik, en spraken bijna 2 uur met elkaar. Leuk om te vergelijken waarom en hoe we notities maken in Obsid...", "name":"Nabeschouwing: de eerste Nederlandstalige Obsidian meet-up", "published":"2021-04-25T11:24:48+02:00", "source":"https://brainbaking.com/bugfix-interface-conversion-panic.html", "target":"https://brainbaking.com/", "type":"mention", "url":"https://www.zylstra.org/blog/2021/04/nabeschouwing-de-eerste-nederlandstalige-obsidian-meet-up/"}`,
+		},
 		{
 			label: "receive a Webmention bookmark via twitter",
 			wm: mf.Mention{
diff --git a/mocks/bugfix-interface-conversion-panic.html b/mocks/bugfix-interface-conversion-panic.html
new file mode 100644
index 0000000..384993d
--- /dev/null
+++ b/mocks/bugfix-interface-conversion-panic.html
@@ -0,0 +1,355 @@
+<!DOCTYPE html>
+<html lang="nl-nl">
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width" />
+  <link rel="profile" href="http://microformats.org/profile/specs" />
+  <link rel="profile" href="http://microformats.org/profile/hatom" />
+  <link rel="microsub" href="https://aperture.p3k.io/microsub/144">
+
+  <title>Nabeschouwing: de eerste Nederlandstalige Obsidian meet-up &#8211; Interdependent Thoughts</title>
+  <meta name='robots' content='max-image-preview:large' />
+  <link rel='dns-prefetch' href='//s.w.org' />
+  <link rel="alternate" type="application/rss+xml" title="Interdependent Thoughts &raquo; Feed" href="https://www.zylstra.org/blog/feed/" />
+  <link rel="alternate" type="application/rss+xml" title="Interdependent Thoughts &raquo; Comments Feed" href="https://www.zylstra.org/blog/comments/feed/" />
+  <link rel="alternate" type="application/rss+xml" title="Interdependent Thoughts &raquo; Nabeschouwing: de eerste Nederlandstalige Obsidian meet-up Comments Feed" href="https://www.zylstra.org/blog/2021/04/nabeschouwing-de-eerste-nederlandstalige-obsidian-meet-up/feed/" />
+  <script type="text/javascript">
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+  </script>
+  <style type="text/css">
+    img.wp-smiley,
+    img.emoji {
+      display: inline !important;
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+      width: 1em !important;
+      margin: 0 .07em !important;
+      vertical-align: -0.1em !important;
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+    }
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+  .widget {
+    border-bottom: 5px solid #000000;
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+<div id="page">
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+              <span class="sep">Posted on </span><a href="https://www.zylstra.org/blog/2021/04/nabeschouwing-de-eerste-nederlandstalige-obsidian-meet-up/" title="11:24" rel="bookmark" class="url u-url"><time class="entry-date updated published dt-updated dt-published" datetime="2021-04-25T11:24:48+02:00" itemprop="dateModified datePublished">25 April, 2021</time></a><address class="byline"> <span class="sep"> by </span><span class="author p-author" itemprop="author" itemscope itemtype="http://schema.org/Person"><a rel="author" class="p-author" href="https://www.zylstra.org/blog/about-me/" title="Ton Zijlstra" itemprop="url"><span itemprop="name">Ton Zijlstra</span></a></span></address>		</div><!-- .entry-meta -->
+          </header><!-- .entry-header -->
+          <div class="entry-reaction"></div>
+          <div class="entry-content e-content" itemprop="description articleBody">
+            <p>De allereerste Nederlandstalige meet-up van Obsidian.md gebruikers was interessant en leuk! We waren met z&#8217;n vieren, <a href="https://seblog.nl/">Sebastiaan</a>, <a href="https://brainbaking.com/">Wouter</a>, <a href="https://diggingthedigital.com/">Frank</a> en ik, en spraken bijna 2 uur met elkaar. Leuk om te vergelijken waarom en hoe we notities maken in Obsidian, te horen over de (vaak lange) historie die iedereen heeft met notities schrijven, met de hand of in een reeks tools. Het gesprek ging vooral over onze werkwijzen bij het <em>toevoegen</em> van notities, en in mindere mate over het <em>gebruik</em> van die notities. </p>
+            <p>Dat gebruik is zeker iets om over door te praten een volgende keer, en voor mezelf om bewuster bij stil te staan. Ik merk dat ik nog vooral in de modus zit om mijn collectie voldoende te laten groeien, en minder in het bewust raadplegen van mijn materiaal als ik met een onderwerp aan de slag ga, of iets wil maken. Tegelijkertijd merk ik wel dat ik nieuwe verbindingen leg tussen notities, en (omdat ik mijn oude weblog postings tot notities verwerk) tussen oudere en nieuwere gedachten waarover ik heb geblogd. En dat ik in het afgelopen half jaar een paar blogpostings en twee presentaties heb gemaakt die direct voortkomen uit het samenbrengen van bestaande conceptuele notities. Dat soort productieve uitkomsten is al heel nuttig, maar ik ben nog op zoek naar het een grotere rol geven van mijn notities in het reflecteren op een onderwerp, in het nadenken over vragen etc. Dit allemaal ten aanzien van conceptuele dingen dan, want m.b.t. mijn uitvoerend werk zijn mijn notities het werk als het ware.</p>
+            <p>Daarvoor is in ieder geval regelmatige blootstelling aan mijn notities nodig denk ik. Enerzijds door beter te weten wat ik er in heb zitten, en anderzijds door me in mijn workflow vaker bezig te houden met wat ik over een thema al heb bedacht, verzameld en geschreven. In de afgelopen weken ben ik daarom meer index-achtige notities gaan maken, emergente outlines. Door anderen wel maps of content genoemd, ik noem ze olifantenpaadjes. Zo&#8217;n notitie verwijst vooral naar bestaande notities, met wat zinnen er bij waarom ik die links bij elkaar plaats. Zo&#8217;n verwijs-notitie helpt me makkelijker de weg te vinden in mijn digitale tuin. Ik maakte eerder al emergente outlines maar die waren niet op navigatie gericht maar op het samenbrengen van notities in een ruwe verhaallijn, dus meer op schrijven gericht.<br />
+              Een andere manier van blootstelling is via spaced repetition de inhoud van mijn notities voorbij laten komen, in <a href="https://www.zylstra.org/blog/2021/01/connecting-my-pkm-to-anki/">de vorm van Anki vragen</a> bijvoorbeeld. Sebastiaan liet gisteren zien dat hij een plugin aan het maken is die dat binnen Obsidian zelf doet, niet gericht op vragen of onthouden, maar gericht op herlezen. </p>
+            <p>De belangrijkste ingang voor hergebruik van mijn eigen materiaal is vaker mijn notities raadplegen als ik met een vraag aan de slag ga. Te veel leun ik op mijn eigen actieve herinnering, en dat leidt vaak tot reconstructie van dingen terwijl ik die al keurig heb uitgewerkt in mijn notities. </p>
+            <p>Wouter schrijft veel met de hand, en liet zien hoe hij al die handgeschreven pagina&#8217;s scant en in zijn Obsidian vault opneemt. Op die manier kan hij ze raadplegen en er naar verwijzen als hij er dingen uit tilt en in een notitie opneemt. Dit is een interessante manier. Al schrijf ik veel direct digitaal, ik maak ook veel handmatige aantekeningen, en er ligt hier een stapel A5 notitieboekjes. Nu heb ik ook een <a href="https://www.czur.com/product/shineultra">staande scanner met voetpedaal van CZUR</a>, en die leent zich goed om snel notitieboekjes te digitaliseren realiseerde ik me na de meet-up. Daar maar eens mee experimenteren.</p>
+            <p>Tot slot, was ik blij met hoe prettig mijn Jitsi server werkte zo met z&#8217;n vieren. Benieuwd hoe dat gaat als je met een grotere groep bent. Alleen het scherm delen had een rare bug waarbij de bovenste strook van een scherm bleef hangen op het eerste beeld. </p>
+            <p>Wil je ook met andere Obsidian gebruikers in het Nederlandse praten over je ervaringen? Kom dan naar het #nederlands kanaal op de <a href="https://obsidian.md/community">Obsidian Discord server</a>. </p>
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+            Posted		<span class="cat-links">
+		in <a href="https://www.zylstra.org/blog/category/knowledge-management/" rel="category tag">knowledge management</a>, <a href="https://www.zylstra.org/blog/category/knowledgemanagement/" rel="category tag">Knowledgemanagement</a>, <a href="https://www.zylstra.org/blog/category/nederlands/" rel="category tag">Nederlands</a>	</span>
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+        <img class="u-photo" src="https://brainbaking.com/picture.jpg" alt="" width="75" height="75" class="aligncenter size-thumbnail wp-image-2931" /><br/>
+        Blog <a class="u-url url u-uid uid"  rel="me" href="https://www.zylstra.org/blog">In<em>ter</em>dependent Thoughts</a> maintained since 2002 by <span class="p-name fn">Ton Zijlstra</span>. <br/>
+        <span class="p-note">European citizen in a networked world. Based in the <span class="p-country-name">Netherlands</span>, living in Europe, working globally. There are no Others. There is just me and many of you.
+<br/><br/>
+I write about how our digital and networked world changes how we work, learn, decide and organize.  I explore the tools and strategies that help us navigate the networked world.
+I am passionate about increasing people's ability to act (knowledge), and their ability to change (learning).  Key-words: open data, open government, fablabs, making, complexity, networked agency, networked learning, ethics by design.</span>
+        <br/><br/>
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+      </section><section id="custom_html-2" class="widget_text widget widget_custom_html"><h3 class="widget-title">On this day&#8230;</h3><div class="textwidget custom-html-widget"><div style="background-color: #10b1bc; padding:2px; padding-left:4px; text-shadow: 0 0 0;"><p>There are <strong>3</strong> posts  found on this site published on April 25</p> <ul class="todaypost"><li><strong>April 25, 2018</strong><ul><li><a href="https://www.zylstra.org/blog/2018/04/ellis-as-the-cern-for-ai/">ELLIS as the CERN for AI</a> <span class="today_excerpt">I an open letter (PDF) a range of institutions call upon their respective European governments to create ELLIS, the European Lab for Learning and Intelligent Systems. It&#8217;s an effort to fortify against brain drain, and instead attract top talent to Europe. It points to the currently weak position in AI of Europe between what is [&hellip;]</span></li><li><a href="https://www.zylstra.org/blog/2018/04/time-for-an-rss-revival/">Time for an RSS Revival</a> <span class="today_excerpt">Wired is calling for an RSS revival. RSS is the most important piece of internet plumbing for following new content from a wide range of sources. It allows you to download new updates from your favourite sites automatically and read them at your leisure. Dave Winer, forever dedicated to the open web, created it. I [&hellip;]</span></li></li></ul><li><strong>April 25, 2006</strong><ul><li><a href="https://www.zylstra.org/blog/2006/04/should_mainstre/">Should Mainstream Media Be Worried?</a> <span class="today_excerpt">The discussion whether blogs will replace journalism is as old as blogs are, and the answer still is a resounding No, afaik. But we will increasingly see attempts to blend different aspects and pieces of functionality from both sides of the discussion. Our local newspaper is one of the few main stream media companies that [&hellip;]</span></li></ul>
+      </div></div></section><section id="tag_cloud-2" class="widget widget_tag_cloud"><h3 class="widget-title">Tags</h3><div class="tagcloud"><a href="https://www.zylstra.org/blog/tag/adtech/" class="tag-cloud-link tag-link-753 tag-link-position-1" style="font-size: 8.8376068376068pt;" aria-label="adtech (12 items)">adtech</a>
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