emojy: add swap and disallow upload overwrites

plugins/emojy/emojy.go

@@ -74,11 +74,52 @@ func (p *EmojyPlugin) register() {
 				return false
 			},
 		},
+		{
+			Kind: bot.Message, IsCmd: true,
+			Regex: regexp.MustCompile(`(?i)^swapemojy (?P<old>.+) (?P<new>.+)$`),
+			Handler: func(r bot.Request) bool {
+				old := sanitizeName(r.Values["old"])
+				new := sanitizeName(r.Values["new"])
+				p.rmEmojy(r, old)
+				p.addEmojy(r, new)
+				return true
+			},
+		},
 		{
 			Kind: bot.Message, IsCmd: true,
 			Regex: regexp.MustCompile(`(?i)^addemojy (?P<name>.+)$`),
 			Handler: func(r bot.Request) bool {
 				name := sanitizeName(r.Values["name"])
+				return p.addEmojy(r, name)
+			},
+		},
+		{
+			Kind: bot.Message, IsCmd: true,
+			Regex: regexp.MustCompile(`(?i)^rmemojy (?P<name>.+)$`),
+			Handler: func(r bot.Request) bool {
+				name := sanitizeName(r.Values["name"])
+				return p.rmEmojy(r, name)
+			},
+		},
+	}
+	p.b.RegisterTable(p, ht)
+}
+
+func (p *EmojyPlugin) rmEmojy(r bot.Request, name string) bool {
+	onServerList := invertEmojyList(p.b.GetEmojiList(false))
+	if _, ok := onServerList[name]; !ok {
+		p.b.Send(r.Conn, bot.Message, r.Msg.Channel, "Emoji does not exist")
+		return true
+	}
+	if err := r.Conn.DeleteEmojy(name); err != nil {
+		p.b.Send(r.Conn, bot.Message, r.Msg.Channel, "error "+err.Error())
+		return true
+	}
+	p.b.Send(r.Conn, bot.Message, r.Msg.Channel, "removed emojy "+name)
+	return true
+}
+
+func (p *EmojyPlugin) addEmojy(r bot.Request, name string) bool {
 	onServerList := invertEmojyList(p.b.GetEmojiList(false))
 	if _, ok := onServerList[name]; ok {
 		p.b.Send(r.Conn, bot.Message, r.Msg.Channel, "Emoji already exists")
@@ -96,28 +137,6 @@ func (p *EmojyPlugin) register() {
 		}
 	}
 	return true
-			},
-		},
-		{
-			Kind: bot.Message, IsCmd: true,
-			Regex: regexp.MustCompile(`(?i)^rmemojy (?P<name>.+)$`),
-			Handler: func(r bot.Request) bool {
-				name := sanitizeName(r.Values["name"])
-				onServerList := invertEmojyList(p.b.GetEmojiList(false))
-				if _, ok := onServerList[name]; !ok {
-					p.b.Send(r.Conn, bot.Message, r.Msg.Channel, "Emoji does not exist")
-					return true
-				}
-				if err := r.Conn.DeleteEmojy(name); err != nil {
-					p.b.Send(r.Conn, bot.Message, r.Msg.Channel, "error "+err.Error())
-					return true
-				}
-				p.b.Send(r.Conn, bot.Message, r.Msg.Channel, "removed emojy "+name)
-				return true
-			},
-		},
-	}
-	p.b.RegisterTable(p, ht)
 }
 
 func (p *EmojyPlugin) recordReaction(emojy string) error {

plugins/emojy/web.go

@@ -102,6 +102,10 @@ func (p *EmojyPlugin) FileSave(r *http.Request) (string, error) {
 				return "", fmt.Errorf("error opening part %q: %s", fileHeader.Filename, err)
 			}
 			emojyFileName := fileHeader.Filename
+			emojyName := strings.TrimSuffix(emojyFileName, filepath.Ext(emojyFileName))
+			if ok, _, _, _ := p.isKnownEmojy(emojyName); ok {
+				return "", fmt.Errorf("emojy already exists")
+			}
 			emojyPath := p.c.Get("emojy.path", "emojy")
 			contentType := fileHeader.Header.Get("Content-Type")
 			if !strings.HasPrefix(contentType, "image") {