Add flag that makes link editable by any user on tailnet

.gitignore

@@ -1,2 +1,3 @@
 node_modules
 package-lock.json
+*.db

db.go

@@ -19,11 +19,12 @@ import (
 
 // Link is the structure stored for each go short link.
 type Link struct {
-	Short    string // the "foo" part of http://go/foo
-	Long     string // the target URL or text/template pattern to run
-	Created  time.Time
-	LastEdit time.Time // when the link was last edited
-	Owner    string    // user@domain
+	Short            string // the "foo" part of http://go/foo
+	Long             string // the target URL or text/template pattern to run
+	Created          time.Time
+	LastEdit         time.Time // when the link was last edited
+	Owner            string    // user@domain
+	GloballyEditable bool      // when set, link is editable by everyone on the tailnet
 }
 
 // ClickStats is the number of clicks a set of links have received in a given
@@ -67,14 +68,14 @@ func NewSQLiteDB(f string) (*SQLiteDB, error) {
 // The caller owns the returned values.
 func (s *SQLiteDB) LoadAll() ([]*Link, error) {
 	var links []*Link
-	rows, err := s.db.Query("SELECT Short, Long, Created, LastEdit, Owner FROM Links")
+	rows, err := s.db.Query("SELECT Short, Long, Created, LastEdit, Owner, GloballyEditable FROM Links")
 	if err != nil {
 		return nil, err
 	}
 	for rows.Next() {
 		link := new(Link)
 		var created, lastEdit int64
-		err := rows.Scan(&link.Short, &link.Long, &created, &lastEdit, &link.Owner)
+		err := rows.Scan(&link.Short, &link.Long, &created, &lastEdit, &link.Owner, &link.GloballyEditable)
 		if err != nil {
 			return nil, err
 		}
@@ -93,8 +94,8 @@ func (s *SQLiteDB) LoadAll() ([]*Link, error) {
 func (s *SQLiteDB) Load(short string) (*Link, error) {
 	link := new(Link)
 	var created, lastEdit int64
-	row := s.db.QueryRow("SELECT Short, Long, Created, LastEdit, Owner FROM Links WHERE ID = ?1 LIMIT 1", linkID(short))
-	err := row.Scan(&link.Short, &link.Long, &created, &lastEdit, &link.Owner)
+	row := s.db.QueryRow("SELECT Short, Long, Created, LastEdit, Owner, GloballyEditable FROM Links WHERE ID = ?1 LIMIT 1", linkID(short))
+	err := row.Scan(&link.Short, &link.Long, &created, &lastEdit, &link.Owner, &link.GloballyEditable)
 	if err != nil {
 		if errors.Is(err, sql.ErrNoRows) {
 			err = fs.ErrNotExist
@@ -108,7 +109,7 @@ func (s *SQLiteDB) Load(short string) (*Link, error) {
 
 // Save saves a Link.
 func (s *SQLiteDB) Save(link *Link) error {
-	result, err := s.db.Exec("INSERT OR REPLACE INTO Links (ID, Short, Long, Created, LastEdit, Owner) VALUES (?, ?, ?, ?, ?, ?)", linkID(link.Short), link.Short, link.Long, link.Created.Unix(), link.LastEdit.Unix(), link.Owner)
+	result, err := s.db.Exec("INSERT OR REPLACE INTO Links (ID, Short, Long, Created, LastEdit, Owner, GloballyEditable) VALUES (?, ?, ?, ?, ?, ?, ?)", linkID(link.Short), link.Short, link.Long, link.Created.Unix(), link.LastEdit.Unix(), link.Owner, link.GloballyEditable)
 	if err != nil {
 		return err
 	}

golink.go

@@ -344,6 +344,10 @@ func serveDetail(w http.ResponseWriter, r *http.Request) {
 		data.Link.Owner = login
 	}
 
+	if link.GloballyEditable {
+		data.Editable = true
+	}
+
 	detailTmpl.Execute(w, data)
 }
 
@@ -456,7 +460,7 @@ func serveSave(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 	}
 
-	if link != nil && link.Owner != "" && link.Owner != login {
+	if link != nil && link.Owner != "" && link.Owner != login && !link.GloballyEditable {
 		exists, err := userExists(r.Context(), link.Owner)
 		if err != nil {
 			log.Printf("looking up tailnet user %q: %v", link.Owner, err)
@@ -484,6 +488,8 @@ func serveSave(w http.ResponseWriter, r *http.Request) {
 		owner = login
 	}
 
+	globallyEditable := r.FormValue("globally-editable") == "on"
+
 	now := time.Now().UTC()
 	if link == nil {
 		link = &Link{
@@ -495,6 +501,7 @@ func serveSave(w http.ResponseWriter, r *http.Request) {
 	link.Long = long
 	link.LastEdit = now
 	link.Owner = owner
+	link.GloballyEditable = globallyEditable
 	if err := db.Save(link); err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return

schema.sql

@@ -4,7 +4,8 @@ CREATE TABLE IF NOT EXISTS Links (
 	Long     TEXT    NOT NULL DEFAULT "",
 	Created  INTEGER NOT NULL DEFAULT (strftime('%s', 'now')), -- unix seconds
 	LastEdit INTEGER NOT NULL DEFAULT (strftime('%s', 'now')), -- unix seconds
-	Owner	 TEXT    NOT NULL DEFAULT ""
+	Owner	 TEXT    NOT NULL DEFAULT "",
+	GloballyEditable INTEGER NOT NULL DEFAULT FALSE
 );
 
 CREATE TABLE IF NOT EXISTS Stats (

tmpl/detail.html

@@ -17,6 +17,8 @@ <h2 class="text-xl font-bold pb-2">Link Details</h2>
 
       <label for=owner class="text-sm font-bold block mt-4">Owner</label>
       <input id=owner name=owner required type=text size=25 placeholder="Owner" value="{{.Link.Owner}}"{{if not .Editable}} disabled{{end}} class="p-2 rounded-md border-gray-300 placeholder:text-gray-400 disabled:bg-gray-100">
+      <input id=globally-editable name=globally-editable type=checkbox {{if .Link.GloballyEditable}} checked{{end}} class="p-2 rounded-md border-gray-300 disabled:bg-gray-100">
+      <label for=globally-editable>Editable by anyone</label>
 
       <dl>
         <dt class="text-sm font-bold mt-6">Date Created</dt>