proxy: add route portal json (#5428)

* proxy: add route portal json

* fix 405 issue

* add link to issue

* Update proxy/portal/filter_test.go

Co-authored-by: Kenneth Jenkins <51246568+kenjenkins@users.noreply.github.com>

---------

Co-authored-by: Kenneth Jenkins <51246568+kenjenkins@users.noreply.github.com>

proxy/portal/portal.go

@@ -0,0 +1,60 @@
+// Package portal contains the code for the routes portal
+package portal
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/pomerium/pomerium/config"
+	"github.com/pomerium/pomerium/internal/urlutil"
+	"github.com/pomerium/pomerium/pkg/zero/importutil"
+)
+
+// A Route is a portal route.
+type Route struct {
+	ID             string `json:"id"`
+	Name           string `json:"name"`
+	Type           string `json:"type"`
+	From           string `json:"from"`
+	Description    string `json:"description"`
+	ConnectCommand string `json:"connect_command,omitempty"`
+	LogoURL        string `json:"logo_url"`
+}
+
+// RoutesFromConfigRoutes converts config routes into portal routes.
+func RoutesFromConfigRoutes(routes []*config.Policy) []Route {
+	prs := make([]Route, len(routes))
+	for i, route := range routes {
+		pr := Route{}
+		pr.ID = route.ID
+		if pr.ID == "" {
+			pr.ID = fmt.Sprintf("%x", route.MustRouteID())
+		}
+		pr.Name = route.Name
+		pr.From = route.From
+		fromURL, err := urlutil.ParseAndValidateURL(route.From)
+		if err == nil {
+			if strings.HasPrefix(fromURL.Scheme, "tcp+") {
+				pr.Type = "tcp"
+				pr.ConnectCommand = "pomerium-cli tcp " + fromURL.Host
+			} else if strings.HasPrefix(fromURL.Scheme, "udp+") {
+				pr.Type = "udp"
+				pr.ConnectCommand = "pomerium-cli udp " + fromURL.Host
+			} else {
+				pr.Type = "http"
+			}
+		} else {
+			pr.Type = "http"
+		}
+		pr.Description = route.Description
+		pr.LogoURL = route.LogoURL
+		prs[i] = pr
+	}
+	// generate names if they're empty
+	for i, name := range importutil.GenerateRouteNames(routes) {
+		if prs[i].Name == "" {
+			prs[i].Name = name
+		}
+	}
+	return prs
+}