Support Web Monetization via backend attribute

This supports a new `monetization_pointer` collection attribute.
When present, we include the `monetization` meta tag on all
collection pages.

collections.go

@@ -552,6 +552,7 @@ type CollectionPage struct {
 	IsOwner        bool
 	CanPin         bool
 	Username       string
+	Monetization   string
 	Collections    *[]Collection
 	PinnedPosts    *[]PublicPost
 	IsAdmin        bool
@@ -829,6 +830,7 @@ func handleViewCollection(app *App, w http.ResponseWriter, r *http.Request) erro
 	// Add more data
 	// TODO: fix this mess of collections inside collections
 	displayPage.PinnedPosts, _ = app.db.GetPinnedPosts(coll.CollectionObj, isOwner)
+	displayPage.Monetization = app.db.GetCollectionAttribute(coll.ID, "monetization_pointer")
 
 	collTmpl := "collection"
 	if app.cfg.App.Chorus {
@@ -947,6 +949,7 @@ func handleViewCollectionTag(app *App, w http.ResponseWriter, r *http.Request) e
 	// Add more data
 	// TODO: fix this mess of collections inside collections
 	displayPage.PinnedPosts, _ = app.db.GetPinnedPosts(coll.CollectionObj, isOwner)
+	displayPage.Monetization = app.db.GetCollectionAttribute(coll.ID, "monetization_pointer")
 
 	err = templates["collection-tags"].ExecuteTemplate(w, "collection-tags", displayPage)
 	if err != nil {

database.go

@@ -2162,6 +2162,28 @@ func (db *datastore) CollectionHasAttribute(id int64, attr string) bool {
 	return true
 }
 
+func (db *datastore) GetCollectionAttribute(id int64, attr string) string {
+	var v string
+	err := db.QueryRow("SELECT value FROM collectionattributes WHERE collection_id = ? AND attribute = ?", id, attr).Scan(&v)
+	switch {
+	case err == sql.ErrNoRows:
+		return ""
+	case err != nil:
+		log.Error("Couldn't SELECT value in getCollectionAttribute for attribute '%s': %v", attr, err)
+		return ""
+	}
+	return v
+}
+
+func (db *datastore) SetCollectionAttribute(id int64, attr, v string) error {
+	_, err := db.Exec("INSERT INTO collectionattributes (collection_id, attribute, value) VALUES (?, ?, ?)", id, attr, v)
+	if err != nil {
+		log.Error("Unable to INSERT into collectionattributes: %v", err)
+		return err
+	}
+	return nil
+}
+
 // DeleteAccount will delete the entire account for userID
 func (db *datastore) DeleteAccount(userID int64) error {
 	// Get all collections

posts.go

@@ -1476,6 +1476,7 @@ Are you sure it was ever here?`,
 			IsOwner        bool
 			IsPinned       bool
 			IsCustomDomain bool
+			Monetization   string
 			PinnedPosts    *[]PublicPost
 			IsFound        bool
 			IsAdmin        bool
@@ -1493,6 +1494,7 @@ Are you sure it was ever here?`,
 		tp.CanInvite = canUserInvite(app.cfg, tp.IsAdmin)
 		tp.PinnedPosts, _ = app.db.GetPinnedPosts(coll, p.IsOwner)
 		tp.IsPinned = len(*tp.PinnedPosts) > 0 && PostsContains(tp.PinnedPosts, p)
+		tp.Monetization = app.db.GetCollectionAttribute(coll.ID, "monetization_pointer")
 
 		if !postFound {
 			w.WriteHeader(http.StatusNotFound)

templates/chorus-collection-post.tmpl

@@ -29,6 +29,7 @@
 		<meta property="og:updated_time" content="{{.Created8601}}" />
 		{{range .Images}}<meta property="og:image" content="{{.}}" />{{else}}<meta property="og:image" content="{{.Collection.AvatarURL}}">{{end}}
 		<meta property="article:published_time" content="{{.Created8601}}">
+		{{template "collection-meta" .}}
 		{{if .Collection.StyleSheet}}<style type="text/css">{{.Collection.StyleSheetDisplay}}</style>{{end}}
 	<style type="text/css">
 body footer {

templates/chorus-collection.tmpl

@@ -27,6 +27,7 @@
 		<meta property="og:url" content="{{.CanonicalURL}}" />
 		<meta property="og:description" content="{{.Description}}" />
 		<meta property="og:image" content="{{.AvatarURL}}">
+		{{template "collection-meta" .}}
 		{{if .StyleSheet}}<style type="text/css">{{.StyleSheetDisplay}}</style>{{end}}
 	<style type="text/css">
 body#collection header {

templates/collection-post.tmpl

@@ -31,6 +31,7 @@
 		{{range .Images}}<meta property="og:image" content="{{.}}" />{{else}}<meta property="og:image" content="{{.Collection.AvatarURL}}">{{end}}
 		<meta property="article:published_time" content="{{.Created8601}}">
 		{{ end }}
+		{{template "collection-meta" .}}
 		{{if .Collection.StyleSheet}}<style type="text/css">{{.Collection.StyleSheetDisplay}}</style>{{end}}
 
 		{{if .Collection.RenderMathJax}}

templates/collection-tags.tmpl

@@ -29,6 +29,7 @@
 		<meta property="og:type" content="article" />
 		<meta property="og:url" content="{{.CanonicalURL}}tag:{{.Tag}}" />
 		<meta property="og:image" content="{{.Collection.AvatarURL}}">
+		{{template "collection-meta" .}}
 		{{if .Collection.StyleSheet}}<style type="text/css">{{.Collection.StyleSheetDisplay}}</style>{{end}}
 
 		{{if .Collection.RenderMathJax}}

templates/collection.tmpl

@@ -27,6 +27,7 @@
 		<meta property="og:url" content="{{.CanonicalURL}}" />
 		<meta property="og:description" content="{{.Description}}" />
 		<meta property="og:image" content="{{.AvatarURL}}">
+		{{template "collection-meta" .}}
 		{{if .StyleSheet}}<style type="text/css">{{.StyleSheetDisplay}}</style>{{end}}
 
 		{{if .RenderMathJax}}

templates/include/post-render.tmpl

@@ -1,4 +1,10 @@
 <!-- Miscelaneous render related template parts we use multiple times -->
+{{define "collection-meta"}}
+	{{if .Monetization -}}
+		<meta name="monetization" content="{{.Monetization}}" />
+	{{- end}}
+{{end}}
+
 {{define "highlighting"}}
 <script>
   // TODO: this feels more like a mutation observer