Add readonly api to gateway

Based on ipfs#1389

License: MIT
Signed-off-by: rht <[email protected]>

Author: rht

cmd/ipfs/daemon.go

@@ -401,6 +401,7 @@ func serveHTTPGateway(req cmds.Request) (error, <-chan error) {
 	}
 
 	var opts = []corehttp.ServeOption{
+		corehttp.CommandsROOption(*req.InvocContext()),
 		corehttp.VersionOption(),
 		corehttp.IPNSHostnameOption(),
 		corehttp.GatewayOption(writable),

core/commands/root.go

@@ -109,9 +109,39 @@ var rootSubcommands = map[string]*cmds.Command{
 	"version":   VersionCmd,
 	"bitswap":   BitswapCmd,
 }
+var rootROSubcommands = map[string]*cmds.Command{
+	"block": &cmds.Command{
+		Subcommands: map[string]*cmds.Command{
+			"stat": blockStatCmd,
+			"get":  blockGetCmd,
+		},
+	},
+	"cat":      CatCmd,
+	"commands": CommandsDaemonCmd,
+	"ls":       LsCmd,
+	"name": &cmds.Command{
+		Subcommands: map[string]*cmds.Command{
+			"resolve": IpnsCmd,
+		},
+	},
+	"object": &cmds.Command{
+		Subcommands: map[string]*cmds.Command{
+			"data":  objectDataCmd,
+			"links": objectLinksCmd,
+			"get":   objectGetCmd,
+			"stat":  objectStatCmd,
+		},
+	},
+	"refs": RefsCmd,
+	//"resolve": ResolveCmd,
+}
+
+var RootRO = &cmds.Command{}
 
 func init() {
+	*RootRO = *Root
 	Root.Subcommands = rootSubcommands
+	RootRO.Subcommands = rootROSubcommands
 }
 
 type MessageOutput struct {

core/corehttp/commands.go

@@ -99,7 +99,7 @@ func patchCORSVars(c *cmdsHttp.ServerConfig, addr net.Addr) {
 	}
 }
 
-func CommandsOption(cctx commands.Context) ServeOption {
+func commandsOption(cctx commands.Context, commands *commands.Command) ServeOption {
 	return func(n *core.IpfsNode, l net.Listener, mux *http.ServeMux) (*http.ServeMux, error) {
 
 		cfg := &cmdsHttp.ServerConfig{
@@ -113,8 +113,16 @@ func CommandsOption(cctx commands.Context) ServeOption {
 		addCORSDefaults(cfg)
 		patchCORSVars(cfg, l.Addr())
 
-		cmdHandler := cmdsHttp.NewHandler(cctx, corecommands.Root, cfg)
+		cmdHandler := cmdsHttp.NewHandler(cctx, commands, cfg)
 		mux.Handle(cmdsHttp.ApiPath+"/", cmdHandler)
 		return mux, nil
 	}
 }
+
+func CommandsOption(cctx commands.Context) ServeOption {
+	return commandsOption(cctx, corecommands.Root)
+}
+
+func CommandsROOption(cctx commands.Context) ServeOption {
+	return commandsOption(cctx, corecommands.RootRO)
+}