implemented the /go shortcut processing

database/post_link.go

@@ -1,6 +1,6 @@
 /*
  * Amsterdam Web Communities System
- * Copyright (c) 2025 Erbosoft Metaverse Design Solutions, All Rights Reserved
+ * Copyright (c) 2025-2026 Erbosoft Metaverse Design Solutions, All Rights Reserved
  *
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
@@ -92,6 +92,83 @@ func (d *PostLinkData) AsString() string {
 	return b.String()
 }
 
+/* Classify tells us what kind of post link this is and where we should interpret it from.
+ * Returns:
+ *     String value indicating the scope of the link:
+ *         "global" - Scope across the entire site.
+ *         "community" - Scope within a community.
+ *         "conference" - Scope within a conference.
+ *         "topic" - Scope within a specific topic.
+ *         Empty string - Null link.
+ *     String value indicating what the link points to:
+ *         "community" - Points to a community.
+ *         "conference" - Points to a conference.
+ *         "topic" - Points to a topic.
+ *         "post" - Points to a single post within the topic.
+ *         "postrange" - Points to a range of posts within the topic.
+ *         "postopenrange" - Points to an open-ended range of posts within the topic.
+ *         Empty string - Null link.
+ */
+func (d *PostLinkData) Classify() (string, string) {
+	if d.Community == "" {
+		if d.Conference == "" {
+			if d.Topic == -1 {
+				if d.FirstPost == -1 {
+					return "", ""
+				} else if d.LastPost == -1 {
+					return "topic", "postopenrange"
+				} else if d.LastPost == d.FirstPost {
+					return "topic", "post"
+				} else {
+					return "topic", "postrange"
+				}
+			} else {
+				if d.FirstPost == -1 {
+					return "conference", "topic"
+				} else if d.LastPost == -1 {
+					return "conference", "postopenrange"
+				} else if d.LastPost == d.FirstPost {
+					return "conference", "post"
+				} else {
+					return "conference", "postrange"
+				}
+			}
+		} else {
+			if d.Topic == -1 {
+				return "community", "conference"
+			} else {
+				if d.FirstPost == -1 {
+					return "community", "topic"
+				} else if d.LastPost == -1 {
+					return "community", "postopenrange"
+				} else if d.LastPost == d.FirstPost {
+					return "community", "post"
+				} else {
+					return "community", "postrange"
+				}
+			}
+		}
+	} else {
+		if d.Conference == "" {
+			return "global", "community"
+		} else {
+			if d.Topic == -1 {
+				return "global", "conference"
+			} else {
+				if d.FirstPost == -1 {
+					return "global", "topic"
+				} else if d.LastPost == -1 {
+					return "global", "postopenrange"
+				} else if d.LastPost == d.FirstPost {
+					return "global", "post"
+				} else {
+					return "global", "postrange"
+				}
+			}
+		}
+	}
+}
+
 // Maximum lengths of the components.
 const (
 	maxLinkLength       = 130

main.go

@@ -50,7 +50,7 @@ func setupEcho() *echo.Echo {
 	e.POST("/TODO/*", fn)
 	e.GET("/img/*", ui.AmServeImage)
 	e.GET("/static/*", ui.AmStaticFileHandler())
-	e.GET("/go/:postlink", fn)
+	e.GET("/go/:postlink", ui.AmWrap(JumpToShortcut))
 
 	e.GET("/", ui.AmWrap(TopPage))
 	e.GET("/about", ui.AmWrap(AboutPage))
@@ -79,7 +79,9 @@ func setupEcho() *echo.Echo {
 
 	// community group
 	commGroup := e.Group("/comm/:cid", ui.SetCommunity)
-	commGroup.GET("/profile", ui.AmWrap(ShowCommunity))
+	fn1 := ui.AmWrap(ShowCommunity)
+	commGroup.GET("", fn1)
+	commGroup.GET("/profile", fn1)
 	commGroup.GET("/join", ui.AmWrap(JoinCommunity))
 	commGroup.POST("/join", ui.AmWrap(JoinCommunityWithKey))
 	commGroup.GET("/unjoin", ui.AmWrap(UnjoinCommunity))

top.go

@@ -1,6 +1,6 @@
 /*
  * Amsterdam Web Communities System
- * Copyright (c) 2025 Erbosoft Metaverse Design Solutions, All Rights Reserved
+ * Copyright (c) 2025-2026 Erbosoft Metaverse Design Solutions, All Rights Reserved
  *
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
@@ -11,6 +11,7 @@ package main
 
 import (
 	"fmt"
+	"net/http"
 
 	"git.erbosoft.com/amy/amsterdam/database"
 	"git.erbosoft.com/amy/amsterdam/ui"
@@ -210,3 +211,42 @@ func AboutPage(ctxt ui.AmContext) (string, any, error) {
 	ctxt.VarMap().Set("amsterdam_pageTitle", "About Amsterdam")
 	return "framed_template", "about.jet", nil
 }
+
+/* JumpToShortcut resolves "/go" links by redirecting them to the appropriate page.
+ * Parameters:
+ *     ctxt - The AmContext for the request.
+ * Returns:
+ *     Command string dictating what to be rendered.
+ *     Data as a parameter for the command string.
+ *     Standard Go error status.
+ */
+func JumpToShortcut(ctxt ui.AmContext) (string, any, error) {
+	link, err := database.AmDecodePostLink(ctxt.URLParam("postlink"))
+	if err != nil {
+		ctxt.SetRC(http.StatusNotFound)
+		return ui.ErrorPage(ctxt, fmt.Errorf("not found: %s (%v)", ctxt.URLParam("postlink"), err))
+	}
+	scope, target := link.Classify()
+	if scope != "global" {
+		ctxt.SetRC(http.StatusNotFound)
+		return ui.ErrorPage(ctxt, fmt.Errorf("not found: %s", ctxt.URLParam("postlink")))
+	}
+	if err = link.VerifyNames(ctxt.Ctx()); err != nil {
+		ctxt.SetRC(http.StatusNotFound)
+		return ui.ErrorPage(ctxt, fmt.Errorf("not found: %s (%v)", ctxt.URLParam("postlink"), err))
+	}
+	targetURL := ""
+	switch target {
+	case "community":
+		targetURL = fmt.Sprintf("/comm/%s", link.Community)
+	case "conference":
+		targetURL = fmt.Sprintf("/comm/%s/conf/%s", link.Community, link.Conference)
+	case "topic":
+		targetURL = fmt.Sprintf("/comm/%s/conf/%s/r/%d", link.Community, link.Conference, link.Topic)
+	case "post", "postrange", "postopenrange":
+		targetURL = fmt.Sprintf("/comm/%s/conf/%s/r/%d?r=%d,%d", link.Community, link.Conference, link.Topic, link.FirstPost, link.LastPost)
+	default:
+		return ui.ErrorPage(ctxt, fmt.Errorf("invalid target '%s' for link: %s", target, ctxt.URLParam("postlink")))
+	}
+	return "redirect", targetURL, nil
+}