Add cors middleware for GQL requests (#65)

go.mod

@@ -15,6 +15,7 @@ require (
 	github.com/deckarep/golang-set v1.8.0
 	github.com/ethereum/go-ethereum v1.10.19
 	github.com/gibson042/canonicaljson-go v1.0.3
+	github.com/go-chi/chi/v5 v5.0.7
 	github.com/gogo/protobuf v1.3.3
 	github.com/golang/protobuf v1.5.2
 	github.com/gorilla/mux v1.8.0

go.sum

@@ -393,6 +393,8 @@ github.com/gin-gonic/gin v1.7.0/go.mod h1:jD2toBW3GZUr5UMcdrwQA10I7RuaFOl/SGeDjX
 github.com/glycerine/go-unsnap-stream v0.0.0-20180323001048-9f0cb55181dd/go.mod h1:/20jfyN9Y5QPEAprSgKAUr+glWDY39ZiUEAYOEv5dsE=
 github.com/glycerine/goconvey v0.0.0-20190410193231-58a59202ab31/go.mod h1:Ogl1Tioa0aV7gstGFO7KhffUsb9M4ydbEbbxpcEDc24=
 github.com/go-chi/chi/v5 v5.0.0/go.mod h1:BBug9lr0cqtdAhsu6R4AAdvufI0/XBzAQSsUqJpoZOs=
+github.com/go-chi/chi/v5 v5.0.7 h1:rDTPXLDHGATaeHvVlLcR4Qe0zftYethFucbjVQ1PxU8=
+github.com/go-chi/chi/v5 v5.0.7/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8=
 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=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=

gql/server.go

@@ -8,6 +8,8 @@ import (
 	"github.com/99designs/gqlgen/graphql/playground"
 	"github.com/cosmos/cosmos-sdk/client"
 	"github.com/ethereum/go-ethereum/log"
+	"github.com/go-chi/chi/v5"
+	"github.com/rs/cors"
 	"github.com/spf13/viper"
 )
 
@@ -16,6 +18,16 @@ func Server(ctx client.Context) {
 	if !viper.GetBool("gql-server") {
 		return
 	}
+
+	router := chi.NewRouter()
+
+	// Add CORS middleware around every request
+	// See https://github.com/rs/cors for full option listing
+	router.Use(cors.New(cors.Options{
+		AllowedOrigins: []string{"*"},
+		Debug:          false,
+	}).Handler)
+
 	logFile := viper.GetString("log-file")
 
 	port := viper.GetString("gql-port")
@@ -25,20 +37,20 @@ func Server(ctx client.Context) {
 		logFile: logFile,
 	}}))
 
-	http.Handle("/", playground.Handler("GraphQL playground", "/api"))
+	router.Handle("/", playground.Handler("GraphQL playground", "/api"))
 
 	if viper.GetBool("gql-playground") {
 		apiBase := viper.GetString("gql-playground-api-base")
 
-		http.Handle("/webui", playground.Handler("GraphQL playground", apiBase+"/api"))
+		router.Handle("/webui", playground.Handler("GraphQL playground", apiBase+"/api"))
-		http.Handle("/console", playground.Handler("GraphQL playground", apiBase+"/graphql"))
+		router.Handle("/console", playground.Handler("GraphQL playground", apiBase+"/graphql"))
 	}
 
-	http.Handle("/api", srv)
+	router.Handle("/api", srv)
-	http.Handle("/graphql", srv)
+	router.Handle("/graphql", srv)
 
 	log.Info("Connect to GraphQL playground", "url", fmt.Sprintf("http://localhost:%s", port))
-	err := http.ListenAndServe(":"+port, nil) //nolint: all
+	err := http.ListenAndServe(":"+port, router) //nolint: all
 	if err != nil {
 		panic(err)
 	}