From e20c344f11762de5c101b74d8fe5487054fbea9c Mon Sep 17 00:00:00 2001
From: Ted Unangst <tedu@tedunangst.com>
Date: Tue, 13 Jun 2023 14:58:35 -0400
Subject: [PATCH] an attempt at opengraph

---
 activity.go       |  8 +-------
 avatar.go         |  8 ++++++++
 views/header.html |  1 +
 web.go            | 38 +++++++++++++++++++++++++++++++++++---
 4 files changed, 45 insertions(+), 10 deletions(-)

diff --git a/activity.go b/activity.go
index ba00bd9..2421a61 100644
--- a/activity.go
+++ b/activity.go
@@ -25,7 +25,6 @@ import (
 	"io"
 	notrand "math/rand"
 	"net/http"
-	"net/url"
 	"os"
 	"regexp"
 	"strings"
@@ -1602,12 +1601,7 @@ func junkuser(user *WhatAbout) junk.Junk {
 		a := junk.New()
 		a["type"] = "Image"
 		a["mediaType"] = "image/png"
-		if ava := user.Options.Avatar; ava != "" {
-			a["url"] = ava
-		} else {
-			u := fmt.Sprintf("https://%s/a?a=%s", serverName, url.QueryEscape(user.URL))
-			a["url"] = u
-		}
+		a["url"] = avatarURL(user)
 		j["icon"] = a
 		if ban := user.Options.Banner; ban != "" {
 			a := junk.New()
diff --git a/avatar.go b/avatar.go
index dac92d4..5eec3d3 100644
--- a/avatar.go
+++ b/avatar.go
@@ -23,6 +23,7 @@ import (
 	"image"
 	"image/png"
 	"net/http"
+	"net/url"
 	"regexp"
 	"strconv"
 	"strings"
@@ -103,6 +104,13 @@ func genAvatar(name string) []byte {
 	return buf.Bytes()
 }
 
+func avatarURL(user *WhatAbout) string {
+	if ava := user.Options.Avatar; ava != "" {
+		return ava
+	}
+	return fmt.Sprintf("https://%s/a?a=%s", serverName, url.QueryEscape(user.URL))
+}
+
 func showflag(writer http.ResponseWriter, req *http.Request) {
 	code := mux.Vars(req)["code"]
 	colors := strings.Split(code, ",")
diff --git a/views/header.html b/views/header.html
index 4c535d0..bd10995 100644
--- a/views/header.html
+++ b/views/header.html
@@ -7,6 +7,7 @@
 <link href="/local.css{{ .LocalStyleParam }}" rel="stylesheet">
 {{ end }}
 {{ .APAltLink }}
+{{ .Honkology }}
 <link href="/icon.png" rel="icon">
 <meta name="theme-color" content="#305">
 <meta name="viewport" content="width=device-width">
diff --git a/web.go b/web.go
index 9cb0e75..b26e391 100644
--- a/web.go
+++ b/web.go
@@ -1017,6 +1017,34 @@ func trackback(xid string, r *http.Request) {
 	}
 }
 
+func honkology(honk *Honk) template.HTML {
+	var user *WhatAbout
+	ok := somenumberedusers.Get(honk.UserID, &user)
+	if !ok {
+		return ""
+	}
+	title := fmt.Sprintf("%s: %s", user.Display, honk.Precis)
+	imgurl := avatarURL(user)
+	for _, d := range honk.Donks {
+		if d.Local && strings.HasPrefix(d.Media, "image") {
+			imgurl = d.URL
+			break
+		}
+	}
+	short := honk.Noise
+	if len(short) > 160 {
+		short = short[0:160] + "..."
+	}
+	return templates.Sprintf(
+		`<meta property="og:title" content="%s" />
+<meta property="og:type" content="article" />
+<meta property="article:author" content="%s" />
+<meta property="og:url" content="%s" />
+<meta property="og:image" content="%s" />
+<meta property="og:description" content = "%s" />`,
+		title, user.URL, honk.XID, imgurl, short)
+}
+
 func showonehonk(w http.ResponseWriter, r *http.Request) {
 	name := mux.Vars(r)["name"]
 	user, err := butwhatabout(name)
@@ -1064,19 +1092,23 @@ func showonehonk(w http.ResponseWriter, r *http.Request) {
 		honkpage(w, u, honks, templinfo)
 		return
 	}
+
+	templinfo := getInfo(r)
 	rawhonks := gethonksbyconvoy(honk.UserID, honk.Convoy, 0)
 	reversehonks(rawhonks)
 	var honks []*Honk
 	for _, h := range rawhonks {
-		if h.XID == xid && len(honks) != 0 {
-			h.Style += " glow"
+		if h.XID == xid {
+			templinfo["Honkology"] = honkology(h)
+			if len(honks) != 0 {
+				h.Style += " glow"
+			}
 		}
 		if h.Public && (h.Whofore == 2 || h.IsAcked()) {
 			honks = append(honks, h)
 		}
 	}
 
-	templinfo := getInfo(r)
 	templinfo["ServerMessage"] = "one honk maybe more"
 	templinfo["HonkCSRF"] = login.GetCSRF("honkhonk", r)
 	templinfo["APAltLink"] = templates.Sprintf("<link href='%s' rel='alternate' type='application/activity+json'>", xid)