added post link rewriter template function

database/validate.go

@@ -25,3 +25,16 @@ func AmIsValidAmsterdamID(test string) bool {
 	}
 	return true
 }
+
+// AmIsValidAmsterdamIDChar returns true if the character is a valid character in an Amsterdam ID.
+func AmIsValidAmsterdamIDChar(ch byte) bool {
+	return strings.ContainsRune(AMS_ID_CHARS, rune(ch))
+}
+
+// AmIsValidPostLinkChar returns true if the character is a valid character in a post link.
+func AmIsValidPostLinkChar(ch byte) bool {
+	if strings.ContainsRune(AMS_ID_CHARS, rune(ch)) {
+		return true
+	}
+	return ch == '.' || ch == '!'
+}

htmlcheck/rewriter.go

@@ -98,8 +98,8 @@ func (rw *emailRewriter) Rewrite(data string, svc rewriterServices) *markupData
 // postLinkRewriter is the rewriter that handles links to conference posts.
 type postLinkRewriter struct{}
 
-// postLinkURLPrefix is the default URL prefix for post links.
+// PostLinkURLPrefix is the default URL prefix for post links.
-const postLinkURLPrefix = "x-postlink:"
+const PostLinkURLPrefix = "x-postlink:"
 
 // Name returns the rewriter's name.
 func (rw *postLinkRewriter) Name() string {
@@ -175,7 +175,7 @@ func (rw *postLinkRewriter) Rewrite(data string, svc rewriterServices) *markupDa
 	// build the necessary markup and return it
 	var openA strings.Builder
 	openA.WriteString("<a href=\"")
-	openA.WriteString(postLinkURLPrefix)
+	openA.WriteString(PostLinkURLPrefix)
 	openA.WriteString(link)
 	openA.WriteString("\"")
 	catenate := svc.rewriterAttrValue("ANCHORTAIL")
@@ -196,7 +196,7 @@ func (rw *postLinkRewriter) Rewrite(data string, svc rewriterServices) *markupDa
 type userLinkRewriter struct{}
 
 // userLinkURIPrefix is the default URL prefix for user links.
-const userLinkURIPRefix = "x-userlink:"
+const UserLinkURIPRefix = "x-userlink:"
 
 // Name returns the rewriter's name.
 func (rw *userLinkRewriter) Name() string {
@@ -223,7 +223,7 @@ func (rw *userLinkRewriter) Rewrite(data string, svc rewriterServices) *markupDa
 	// build the necessary markup and return it
 	var openA strings.Builder
 	openA.WriteString("<a href=\"")
-	openA.WriteString(userLinkURIPRefix)
+	openA.WriteString(UserLinkURIPRefix)
 	openA.WriteString(data)
 	openA.WriteString("\"")
 	catenate := svc.rewriterAttrValue("ANCHORTAIL")

main.go

@@ -50,6 +50,7 @@ func setupEcho() *echo.Echo {
 	e.POST("/TODO/*", fn)
 	e.GET("/img/*", ui.AmWrap(ui.AmServeImage))
 	e.GET("/static/*", ui.AmStaticFileHandler())
+	e.GET("/go/:postlink", fn)
 
 	e.GET("/", ui.AmWrap(TopPage))
 	e.GET("/about", ui.AmWrap(AboutPage))

ui/templates.go

@@ -23,6 +23,7 @@ import (
 
 	"git.erbosoft.com/amy/amsterdam/config"
 	"git.erbosoft.com/amy/amsterdam/database"
+	"git.erbosoft.com/amy/amsterdam/htmlcheck"
 	"git.erbosoft.com/amy/amsterdam/util"
 	"github.com/CloudyKit/jet/v6"
 	"github.com/CloudyKit/jet/v6/loaders/embedfs"
@@ -186,6 +187,67 @@ func displayExpandCat(a jet.Arguments) reflect.Value {
 	return reflect.ValueOf(rc.String())
 }
 
+func postRewrite(a jet.Arguments) reflect.Value {
+	data := a.Get(0).Convert(reflect.TypeFor[string]()).String()
+	plIndex := strings.Index(data, htmlcheck.PostLinkURLPrefix)
+	ulIndex := strings.Index(data, htmlcheck.UserLinkURIPRefix)
+	if plIndex < 0 && ulIndex < 0 {
+		return reflect.ValueOf(data)
+	}
+
+	if plIndex >= 0 {
+		var buf strings.Builder
+		t := data
+		for plIndex >= 0 {
+			if plIndex > 0 {
+				buf.WriteString(t[:plIndex])
+				t = t[plIndex+len(htmlcheck.PostLinkURLPrefix):]
+			}
+			p := 0
+			for database.AmIsValidPostLinkChar(t[p]) {
+				p++
+			}
+			if p > 0 {
+				buf.WriteString("/go/")
+				buf.WriteString(t[:p])
+				t = t[p:]
+			} else {
+				buf.WriteString(htmlcheck.PostLinkURLPrefix)
+			}
+			plIndex = strings.Index(t, htmlcheck.PostLinkURLPrefix)
+		}
+		buf.WriteString(t)
+		data = buf.String()
+	}
+
+	ulIndex = strings.Index(data, htmlcheck.UserLinkURIPRefix)
+	if ulIndex >= 0 {
+		var buf strings.Builder
+		t := data
+		for ulIndex >= 0 {
+			if ulIndex > 0 {
+				buf.WriteString(t[:ulIndex])
+				t = t[ulIndex+len(htmlcheck.UserLinkURIPRefix):]
+			}
+			p := 0
+			for database.AmIsValidAmsterdamIDChar(t[p]) {
+				p++
+			}
+			if p > 0 {
+				buf.WriteString("/user/")
+				buf.WriteString(t[:p])
+				t = t[p:]
+			} else {
+				buf.WriteString(htmlcheck.UserLinkURIPRefix)
+			}
+			ulIndex = strings.Index(t, htmlcheck.UserLinkURIPRefix)
+		}
+		buf.WriteString(t)
+		data = buf.String()
+	}
+	return reflect.ValueOf(data)
+}
+
 // SetupTemplates is called to set up the template renderer after the configuration is loaded.
 func SetupTemplates() {
 	views = jet.NewSet(
@@ -199,6 +261,7 @@ func SetupTemplates() {
 	views.AddGlobal("AmsterdamCopyright", config.AMSTERDAM_COPYRIGHT)
 	views.AddGlobal("GlobalConfig", config.GlobalConfig)
 	views.AddGlobalFunc("iif", immediateIf)
+	views.AddGlobalFunc("postRewrite", postRewrite)
 	views.AddGlobalFunc("MakeIntRange", makeIntRange)
 	views.AddGlobalFunc("MakeYearRange", makeYearRange)
 	views.AddGlobalFunc("ExtractCommunityLogo", extractCommunityLogo)

ui/views/new_topic.jet

@@ -41,7 +41,7 @@
 
             <!-- Preview Display -->
             <div class="bg-white border-2 border-blue-300 rounded-lg p-6 mb-6">
-                <pre class="amsPost font-mono text-sm whitespace-pre-wrap break-words">{{ previewPb | raw }}</pre>
+                <pre class="amsPost font-mono text-sm whitespace-pre-wrap break-words">{{ previewPb | postRewrite | raw }}</pre>
             </div>
 
             <hr class="border-gray-400 mb-6">