Register swagger API (cosmos#7246)

* init

* Fix statik gen

* Fix swagger

* Change swagger url

* Fix swagger serve

* remove ibc swagger from legacy docs

* Add old routes config

* Move swagger api to app.go

* add godoc

* Fix inputs

* Fix swagger dir

* Fix statik

* refactor

* fmt

* fix doc

* Fix swagger config check

app.go

@@ -2,20 +2,25 @@ package simapp
 
 import (
 	"io"
+	"net/http"
 	"os"
 	"path/filepath"
 
+	"github.com/gorilla/mux"
+	"github.com/rakyll/statik/fs"
 	abci "github.com/tendermint/tendermint/abci/types"
 	"github.com/tendermint/tendermint/libs/log"
 	tmos "github.com/tendermint/tendermint/libs/os"
 	tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
 	dbm "github.com/tendermint/tm-db"
 
 	"github.com/cosmos/cosmos-sdk/baseapp"
+	"github.com/cosmos/cosmos-sdk/client"
 	"github.com/cosmos/cosmos-sdk/client/rpc"
 	"github.com/cosmos/cosmos-sdk/codec"
 	"github.com/cosmos/cosmos-sdk/codec/types"
 	"github.com/cosmos/cosmos-sdk/server/api"
+	"github.com/cosmos/cosmos-sdk/server/config"
 	simappparams "github.com/cosmos/cosmos-sdk/simapp/params"
 	"github.com/cosmos/cosmos-sdk/std"
 	"github.com/cosmos/cosmos-sdk/testutil/testdata"
@@ -77,6 +82,9 @@ import (
 	upgradeclient "github.com/cosmos/cosmos-sdk/x/upgrade/client"
 	upgradekeeper "github.com/cosmos/cosmos-sdk/x/upgrade/keeper"
 	upgradetypes "github.com/cosmos/cosmos-sdk/x/upgrade/types"
+
+	// unnamed import of statik for swagger UI support
+	_ "github.com/cosmos/cosmos-sdk/client/docs/statik"
 )
 
 const appName = "SimApp"
@@ -530,12 +538,29 @@ func (app *SimApp) SimulationManager() *module.SimulationManager {
 
 // RegisterAPIRoutes registers all application module routes with the provided
 // API server.
-func (app *SimApp) RegisterAPIRoutes(apiSvr *api.Server) {
+func (app *SimApp) RegisterAPIRoutes(apiSvr *api.Server, apiConfig config.APIConfig) {
 	clientCtx := apiSvr.ClientCtx
 	rpc.RegisterRoutes(clientCtx, apiSvr.Router)
 	authrest.RegisterTxRoutes(clientCtx, apiSvr.Router)
+
 	ModuleBasics.RegisterRESTRoutes(clientCtx, apiSvr.Router)
 	ModuleBasics.RegisterGRPCRoutes(apiSvr.ClientCtx, apiSvr.GRPCRouter)
+
+	// register swagger API from root so that other applications can override easily
+	if apiConfig.Swagger {
+		RegisterSwaggerAPI(clientCtx, apiSvr.Router)
+	}
+}
+
+// RegisterSwaggerAPI registers swagger route with API Server
+func RegisterSwaggerAPI(ctx client.Context, rtr *mux.Router) {
+	statikFS, err := fs.New()
+	if err != nil {
+		panic(err)
+	}
+
+	staticServer := http.FileServer(statikFS)
+	rtr.PathPrefix("/swagger/").Handler(http.StripPrefix("/swagger/", staticServer))
 }
 
 // GetMaccPerms returns a copy of the module account permissions