rebased embedr (#3511)

* skeleton of embedr service, based on bskyweb

* embedr container setup

* builds on this branch

* actual routes

* fix embedr go:embed

* tweak embedr dockerfile

* progress on embedr

* fix path params

* tweaks to build process

* try to get embedr dockerfile to install embed deps

* build this branch

* updates to match sam's output HTML

* try to unbreak embedr dockerfile

* small embedr tweak

* docker hack

* get embed.js copied over to embedr

* don't x-frame-options for embed.bsky.app

* bskyembed: remove a console.log

* use html/template for golang snippet generation

* simplify embedr API fetches

* missing file

* Rm console.log fully

---------

Co-authored-by: Dan Abramov <dan.abramov@gmail.com>

bskyweb/cmd/embedr/snippet.go

@@ -0,0 +1,71 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"html/template"
+
+	appbsky "github.com/bluesky-social/indigo/api/bsky"
+	"github.com/bluesky-social/indigo/atproto/syntax"
+)
+
+func (srv *Server) postEmbedHTML(postView *appbsky.FeedDefs_PostView) (string, error) {
+	// ensure that there isn't an injection from the URI
+	aturi, err := syntax.ParseATURI(postView.Uri)
+	if err != nil {
+		log.Error("bad AT-URI in reponse", "aturi", aturi, "err", err)
+		return "", err
+	}
+
+	post, ok := postView.Record.Val.(*appbsky.FeedPost)
+	if !ok {
+		log.Error("bad post record value", "err", err)
+		return "", err
+	}
+
+	const tpl = `<blockquote class="bluesky-embed" data-bluesky-uri="{{ .PostURI }}" data-bluesky-cid="{{ .PostCID }}"><p{{ if .PostLang }} lang="{{ .PostLang }}"{{ end }}>{{ .PostText }}</p>&mdash; {{ .PostAuthor }} {{ .PostIndexedAt }}</blockquote><script async src="{{ .WidgetURL }}" charset="utf-8"></script>`
+
+	t, err := template.New("snippet").Parse(tpl)
+	if err != nil {
+		log.Error("template parse error", "err", err)
+		return "", err
+	}
+
+	var lang string
+	if len(post.Langs) > 0 {
+		lang = post.Langs[0]
+	}
+	var authorName string
+	if postView.Author.DisplayName != nil {
+		authorName = fmt.Sprintf("%s (@%s)", *postView.Author.DisplayName, postView.Author.Handle)
+	} else {
+		authorName = fmt.Sprintf("@%s", postView.Author.Handle)
+	}
+	fmt.Println(postView.Uri)
+	fmt.Println(fmt.Sprintf("%s", postView.Uri))
+	data := struct {
+		PostURI       template.URL
+		PostCID       string
+		PostLang      string
+		PostText      string
+		PostAuthor    string
+		PostIndexedAt string
+		WidgetURL     template.URL
+	}{
+		PostURI:       template.URL(postView.Uri),
+		PostCID:       postView.Cid,
+		PostLang:      lang,
+		PostText:      post.Text,
+		PostAuthor:    authorName,
+		PostIndexedAt: postView.IndexedAt, // TODO: createdAt?
+		WidgetURL:     template.URL("https://embed.bsky.app/static/embed.js"),
+	}
+
+	var buf bytes.Buffer
+	err = t.Execute(&buf, data)
+	if err != nil {
+		log.Error("template parse error", "err", err)
+		return "", err
+	}
+	return buf.String(), nil
+}