add config options for proxy/subdomain

gateway.go

@@ -1,11 +1,46 @@
 package config
 
+type GatewaySpec struct {
+	// PathPrefixes list the set of path prefixes that should be handled by
+	// this gateway.
+	PathPrefixes []string
+
+	// UseSubdomains indicates whether or not this gateway uses subdomains
+	// for IPFS resources instead of paths. That is: http://CID.ipfs.GATEWAY/...
+	//
+	// If this flag is set, any /ipns/$id and/or /ipfs/$id paths in PathPrefixes
+	// will be permanently redirected to http://$id.[ipns|ipfs].$gateway/.
+	//
+	// We do not support using both paths and subdomains for a single domain
+	// for security reasons.
+	UseSubdomains bool
+
+	// RootRedirect is the path to which requests to `/` on this gateway
+	// should be redirected.
+	RootRedirect string
+}
+
 // Gateway contains options for the HTTP gateway server.
 type Gateway struct {
-	HTTPHeaders  map[string][]string // HTTP headers to return with the gateway
-	RootRedirect string
-	Writable     bool
-	PathPrefixes []string
-	APICommands  []string
-	NoFetch      bool
+
+	// HTTPHeaders configures the headers that should be returned by this
+	// gateway.
+	HTTPHeaders map[string][]string // HTTP headers to return with the gateway
+
+	// Writable enables PUT/POST request handling by this gateway. Usually,
+	// writing is done through the API, not the gateway.
+	Writable bool
+
+	// FIXME: Not yet implemented
+	APICommands []string
+
+	// NoFetch configures the gateway to _not_ fetch blocks in response to
+	// requests.
+	NoFetch bool
+
+	// GatewaySpec configures the default behavior for this gateway.
+	GatewaySpec
+
+	// PublicGateways configures behavior of known public gateways.
+	PublicGateways map[string]*GatewaySpec
 }

init.go

@@ -57,10 +57,12 @@ func Init(out io.Writer, nBitsForKeypair int) (*Config, error) {
 		},
 
 		Gateway: Gateway{
-			RootRedirect: "",
-			Writable:     false,
-			NoFetch:      false,
-			PathPrefixes: []string{},
+			GatewaySpec: GatewaySpec{
+				RootRedirect: "",
+				PathPrefixes: []string{},
+			},
+			Writable: false,
+			NoFetch:  false,
 			HTTPHeaders: map[string][]string{
 				"Access-Control-Allow-Origin":  []string{"*"},
 				"Access-Control-Allow-Methods": []string{"GET"},