TUN-7424: Add CORS headers to host_details responses

Author: DevinCarr

go.mod

@@ -66,6 +66,7 @@ require (
 	github.com/facebookgo/stack v0.0.0-20160209184415-751773369052 // indirect
 	github.com/facebookgo/subset v0.0.0-20150612182917-8dac2c3c4870 // indirect
 	github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568 // indirect
+	github.com/go-chi/cors v1.2.1 // indirect
 	github.com/go-logr/logr v1.2.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 // indirect

go.sum

@@ -156,6 +156,8 @@ github.com/gin-gonic/gin v1.6.3/go.mod h1:75u5sXoLsGZoRN5Sgbi1eraJ4GU3++wFwWzhwv
 github.com/gin-gonic/gin v1.8.1 h1:4+fr/el88TOO3ewCmQr8cx/CtZ/umlIRIs5M4NTNjf8=
 github.com/go-chi/chi/v5 v5.0.8 h1:lD+NLqFcAi1ovnVZpsnObHGW4xb4J8lNmoYVfECH1Y0=
 github.com/go-chi/chi/v5 v5.0.8/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8=
+github.com/go-chi/cors v1.2.1 h1:xEC8UT3Rlp2QuWNEr4Fs/c2EAGVKBwy/1vHx3bppil4=
+github.com/go-chi/cors v1.2.1/go.mod h1:sSbTewc+6wYHBBCW7ytsFSn836hqM7JxpglAy2Vzc58=
 github.com/go-errors/errors v1.4.2 h1:J6MZopCL4uSllY1OfXM374weqZFFItUbrImctkmUxIA=
 github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=

management/service.go

@@ -10,6 +10,7 @@ import (
 	"time"
 
 	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/cors"
 	"github.com/google/uuid"
 	"github.com/rs/zerolog"
 	"nhooyr.io/websocket"
@@ -67,7 +68,17 @@ func New(managementHostname string,
 	r.Get("/ping", ping)
 	r.Head("/ping", ping)
 	r.Get("/logs", s.logs)
-	r.Get("/host_details", s.getHostDetails)
+	r.Route("/host_details", func(r chi.Router) {
+		// CORS middleware required to allow dash to access management.argotunnel.com requests
+		r.Use(cors.Handler(cors.Options{
+			// Allows for any subdomain of cloudflare.com
+			AllowedOrigins: []string{"https://*.cloudflare.com"},
+			// Required to present cookies or other authentication across origin boundries
+			AllowCredentials: true,
+			MaxAge:           300, // Maximum value not ignored by any of major browsers
+		}))
+		r.Get("/", s.getHostDetails)
+	})
 	s.router = r
 	return s
 }