Support post signatures

This enables users to add a signature to all blog posts, and update it from a single location.

Requires database migration with: writefreely db migrate

Closes T582

collections.go

@@ -47,6 +47,7 @@ type (
 		Language    string         `schema:"lang" json:"lang,omitempty"`
 		StyleSheet  string         `datastore:"style_sheet" schema:"style_sheet" json:"style_sheet"`
 		Script      string         `datastore:"script" schema:"script" json:"script,omitempty"`
+		Signature   string         `datastore:"post_signature" schema:"signature" json:"-"`
 		Public      bool           `datastore:"public" json:"public"`
 		Visibility  collVisibility `datastore:"private" json:"-"`
 		Format      string         `datastore:"format" json:"format,omitempty"`
@@ -91,6 +92,7 @@ type (
 		Description *string         `schema:"description" json:"description"`
 		StyleSheet  *sql.NullString `schema:"style_sheet" json:"style_sheet"`
 		Script      *sql.NullString `schema:"script" json:"script"`
+		Signature   *sql.NullString `schema:"signature" json:"signature"`
 		Visibility  *int            `schema:"visibility" json:"public"`
 		Format      *sql.NullString `schema:"format" json:"format"`
 	}

database.go

@@ -791,10 +791,10 @@ func (db *datastore) GetCollectionBy(condition string, value interface{}) (*Coll
 	c := &Collection{}
 
 	// FIXME: change Collection to reflect database values. Add helper functions to get actual values
-	var styleSheet, script, format zero.String
-	row := db.QueryRow("SELECT id, alias, title, description, style_sheet, script, format, owner_id, privacy, view_count FROM collections WHERE "+condition, value)
+	var styleSheet, script, signature, format zero.String
+	row := db.QueryRow("SELECT id, alias, title, description, style_sheet, script, post_signature, format, owner_id, privacy, view_count FROM collections WHERE "+condition, value)
 
-	err := row.Scan(&c.ID, &c.Alias, &c.Title, &c.Description, &styleSheet, &script, &format, &c.OwnerID, &c.Visibility, &c.Views)
+	err := row.Scan(&c.ID, &c.Alias, &c.Title, &c.Description, &styleSheet, &script, &signature, &format, &c.OwnerID, &c.Visibility, &c.Views)
 	switch {
 	case err == sql.ErrNoRows:
 		return nil, impart.HTTPError{http.StatusNotFound, "Collection doesn't exist."}
@@ -806,6 +806,7 @@ func (db *datastore) GetCollectionBy(condition string, value interface{}) (*Coll
 	}
 	c.StyleSheet = styleSheet.String
 	c.Script = script.String
+	c.Signature = signature.String
 	c.Format = format.String
 	c.Public = c.IsPublic()
 
@@ -849,7 +850,8 @@ func (db *datastore) UpdateCollection(c *SubmittedCollection, alias string) erro
 		SetStringPtr(c.Title, "title").
 		SetStringPtr(c.Description, "description").
 		SetNullString(c.StyleSheet, "style_sheet").
-		SetNullString(c.Script, "script")
+		SetNullString(c.Script, "script").
+		SetNullString(c.Signature, "post_signature")
 
 	if c.Format != nil {
 		cf := &CollectionFormat{Format: c.Format.String}
@@ -1150,6 +1152,7 @@ func (db *datastore) GetPosts(cfg *config.Config, c *Collection, page int, inclu
 			break
 		}
 		p.extractData()
+		p.augmentContent(c)
 		p.formatContent(cfg, c, includeFuture)
 
 		posts = append(posts, p.processPost())
@@ -1214,6 +1217,7 @@ func (db *datastore) GetPostsTagged(cfg *config.Config, c *Collection, tag strin
 			break
 		}
 		p.extractData()
+		p.augmentContent(c)
 		p.formatContent(cfg, c, includeFuture)
 
 		posts = append(posts, p.processPost())
@@ -1590,6 +1594,7 @@ func (db *datastore) GetPinnedPosts(coll *CollectionObj, includeFuture bool) (*[
 			break
 		}
 		p.extractData()
+		p.augmentContent(&coll.Collection)
 
 		pp := p.processPost()
 		pp.Collection = coll

migrations/drivers.go

@@ -78,3 +78,10 @@ func (db *datastore) engine() string {
 	}
 	return " ENGINE = InnoDB"
 }
+
+func (db *datastore) after(colName string) string {
+	if db.driverName == driverSQLite {
+		return ""
+	}
+	return " AFTER " + colName
+}

migrations/migrations.go

@@ -65,6 +65,7 @@ var migrations = []Migration{
 	New("support oauth attach", oauthAttach),                        // V6 -> V7
 	New("support oauth via invite", oauthInvites),                   // V7 -> V8 (v0.12.0)
 	New("optimize drafts retrieval", optimizeDrafts),                // V8 -> V9
+	New("support post signatures", supportPostSignatures),           // V9 -> V10
 }
 
 // CurrentVer returns the current migration version the application is on

migrations/v10.go

@@ -0,0 +1,33 @@
+/*
+ * Copyright © 2020 A Bunch Tell LLC.
+ *
+ * This file is part of WriteFreely.
+ *
+ * WriteFreely is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, included
+ * in the LICENSE file in this source code package.
+ */
+
+package migrations
+
+func supportPostSignatures(db *datastore) error {
+	t, err := db.Begin()
+	if err != nil {
+		t.Rollback()
+		return err
+	}
+
+	_, err = t.Exec(`ALTER TABLE collections ADD COLUMN post_signature ` + db.typeText() + db.collateMultiByte() + ` NULL` + db.after("script"))
+	if err != nil {
+		t.Rollback()
+		return err
+	}
+
+	err = t.Commit()
+	if err != nil {
+		t.Rollback()
+		return err
+	}
+
+	return nil
+}

postrender.go

@@ -58,6 +58,17 @@ func (p *PublicPost) formatContent(cfg *config.Config, isOwner bool) {
 	p.Post.formatContent(cfg, &p.Collection.Collection, isOwner)
 }
 
+func (p *Post) augmentContent(c *Collection) {
+	// Add post signatures
+	if c.Signature != "" {
+		p.Content += "\n\n" + c.Signature
+	}
+}
+
+func (p *PublicPost) augmentContent() {
+	p.Post.augmentContent(&p.Collection.Collection)
+}
+
 func applyMarkdown(data []byte, baseURL string, cfg *config.Config) string {
 	return applyMarkdownSpecial(data, false, baseURL, cfg)
 }

posts.go

@@ -1140,6 +1140,7 @@ func (p *PublicPost) ActivityObject(app *App) *activitystreams.Object {
 		p.Collection.FederatedAccount() + "/followers",
 	}
 	o.Name = p.DisplayTitle()
+	p.augmentContent()
 	if p.HTMLContent == template.HTML("") {
 		p.formatContent(cfg, false)
 	}
@@ -1430,6 +1431,8 @@ Are you sure it was ever here?`,
 		return impart.HTTPError{http.StatusGone, "Post was unpublished."}
 	}
 
+	p.augmentContent()
+
 	// Serve collection post
 	if isRaw {
 		contentType := "text/plain"

templates/user/collection.tmpl

@@ -5,6 +5,15 @@
 {{define "collection"}}
 {{template "header" .}}
 
+<style>
+textarea.section.norm {
+	font-family: Lora,'Palatino Linotype','Book Antiqua','New York','DejaVu serif',serif !important;
+	min-height: 10em;
+	max-height: 20em;
+	resize: vertical;
+}
+</style>
+
 <div class="content-container snug">
 	<div id="overlay"></div>
 
@@ -129,6 +138,14 @@
 		</div>
 	</div>
 
+	<div class="option">
+		<h2>Post Signature</h2>
+		<div class="section">
+			<p class="explain">This content will be added to the end of every post on this blog, as if it were part of the post itself. Markdown, HTML, and shortcodes are allowed.</p>
+			<textarea id="signature" class="section norm" name="signature">{{.Signature}}</textarea>
+		</div>
+	</div>
+
 	<div class="option" style="text-align: center; margin-top: 4em;">
 		<input type="submit" id="save-changes" value="Save changes" />
 		<p><a href="{{if .SingleUser}}/{{else}}/{{.Alias}}/{{end}}">View Blog</a></p>