add simple json endpoint example

go.mod

@@ -6,6 +6,8 @@ require (
 	github.com/99designs/basicauth-go v0.0.0-20160802081356-2a93ba0f464d
 	github.com/getsentry/sentry-go v0.7.0
 	github.com/go-chi/chi v4.1.2+incompatible
+	github.com/go-chi/cors v1.1.1
+	github.com/jgautheron/goconst v0.0.0-20200920201509-8f5268ce89d5 // indirect
 	github.com/joho/godotenv v1.3.0
 	github.com/prometheus/client_golang v1.6.0
 	github.com/rs/zerolog v1.20.0

go.sum

@@ -84,6 +84,8 @@ github.com/gin-gonic/gin v1.6.3/go.mod h1:75u5sXoLsGZoRN5Sgbi1eraJ4GU3++wFwWzhwv
 github.com/go-check/check v0.0.0-20180628173108-788fd7840127/go.mod h1:9ES+weclKsC9YodN5RgxqK/VD9HM9JsCSh7rNhMZE98=
 github.com/go-chi/chi v4.1.2+incompatible h1:fGFk2Gmi/YKXk0OmGfBh0WgmN3XB8lVnEyNz34tQRec=
 github.com/go-chi/chi v4.1.2+incompatible/go.mod h1:eB3wogJHnLi3x/kFX2A+IbTBlXxmMeXJVKy9tTv1XzQ=
+github.com/go-chi/cors v1.1.1 h1:eHuqxsIw89iXcWnWUN8R72JMibABJTN/4IOYI5WERvw=
+github.com/go-chi/cors v1.1.1/go.mod h1:K2Yje0VW/SJzxiyMYu6iPQYa7hMjQX2i/F491VChg1I=
 github.com/go-errors/errors v1.0.1 h1:LUHzmkK3GUKUrL/1gfBUxAHzcev3apQlezX/+O7ma6w=
 github.com/go-errors/errors v1.0.1/go.mod h1:f4zRHt4oKfwPJE5k8C9vpYG+aDHdBFUsgrm6/TyX73Q=
 github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
@@ -171,6 +173,8 @@ github.com/iris-contrib/blackfriday v2.0.0+incompatible/go.mod h1:UzZ2bDEoaSGPbk
 github.com/iris-contrib/go.uuid v2.0.0+incompatible/go.mod h1:iz2lgM/1UnEf1kP0L/+fafWORmlnuysV2EMP8MW+qe0=
 github.com/iris-contrib/i18n v0.0.0-20171121225848-987a633949d0/go.mod h1:pMCz62A0xJL6I+umB2YTlFRwWXaDFA0jy+5HzGiJjqI=
 github.com/iris-contrib/schema v0.0.1/go.mod h1:urYA3uvUNG1TIIjOSCzHr9/LmbQo8LrOcOqfqxa4hXw=
+github.com/jgautheron/goconst v0.0.0-20200920201509-8f5268ce89d5 h1:LlI/THEqi2n5RNtIIplDTGNCQ6m81r2tem36s7XSxtU=
+github.com/jgautheron/goconst v0.0.0-20200920201509-8f5268ce89d5/go.mod h1:aAosetZ5zaeC/2EfMeRswtxUFBpe2Hr7HzkgX4fanO4=
 github.com/joho/godotenv v1.3.0 h1:Zjp+RcGpHhGlrMbJzXTrZZPrWj+1vfm90La1wgB6Bhc=
 github.com/joho/godotenv v1.3.0/go.mod h1:7hK45KPybAkOC6peb+G5yklZfMxEjkZhHbwpqxOKXbg=
 github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22gdxWY5EU2bo=
@@ -460,6 +464,7 @@ golang.org/x/tools v0.0.0-20190816200558-6889da9d5479/go.mod h1:b+2E5dAYhXwXZwtn
 golang.org/x/tools v0.0.0-20190828213141-aed303cbaa74/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20190911174233-4f2ddba30aff/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191012152004-8de300cfc20a/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20191112195655-aa38f8e97acc h1:NCy3Ohtk6Iny5V/reW2Ktypo4zIpWBdRJ1uFMjBxdg8=
 golang.org/x/tools v0.0.0-20191112195655-aa38f8e97acc/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=

httpserver/handlers.go

@@ -0,0 +1,15 @@
+package httpserver
+
+import (
+	"net/http"
+	"time"
+)
+
+func (s *server) handleNow() http.HandlerFunc {
+	type response struct {
+		Now time.Time `json:"now"`
+	}
+	return func(w http.ResponseWriter, r *http.Request) {
+		s.respondJSON(w, r, &response{Now: time.Now()}, 200)
+	}
+}

httpserver/middlewares.go

@@ -7,9 +7,9 @@ import (
 
 	basicauth "github.com/99designs/basicauth-go"
 	"github.com/go-chi/chi/middleware"
+	"github.com/go-chi/cors"
 	metrics "github.com/slok/go-http-metrics/metrics/prometheus"
 	ghmm "github.com/slok/go-http-metrics/middleware"
-
 	"github.com/slok/go-http-metrics/middleware/std"
 	"github.com/spf13/viper"
 )
@@ -75,10 +75,25 @@ func (s *server) LoggingMiddleware() func(http.Handler) http.Handler {
 	}
 }
 
+func (s *server) CORSMiddleware() func(http.Handler) http.Handler {
+	return cors.Handler(cors.Options{
+		// CHANGEME! these are defaults, change them to suit your needs or
+		// read from environment/viper.
+		// AllowedOrigins: []string{"https://foo.com"}, // Use this to allow specific origin hosts
+		AllowedOrigins: []string{"*"},
+		// AllowOriginFunc:  func(r *http.Request, origin string) bool { return true },
+		AllowedMethods:   []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
+		AllowedHeaders:   []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
+		ExposedHeaders:   []string{"Link"},
+		AllowCredentials: false,
+		MaxAge:           300, // Maximum value not ignored by any of major browsers
+	})
+}
+
 func (s *server) AuthMiddleware() func(http.Handler) http.Handler {
 	return func(next http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-			// FIXME you'll want to change this to do stuff.
+			// CHANGEME you'll want to change this to do stuff.
 			s.log.Info().Msg("AUTH: before request")
 			next.ServeHTTP(w, r)
 		})

httpserver/routes.go

@@ -30,6 +30,10 @@ func (s *server) routes() {
 		s.router.Use(s.MetricsMiddleware())
 	}
 
+	// set up CORS headers. you'll probably want to configure that
+	// in middlewares.go.
+	s.router.Use(s.CORSMiddleware())
+
 	// CHANGEME to suit your needs, or pull from config.
 	// timeout for request context; your handlers must finish within
 	// this window:
@@ -55,6 +59,12 @@ func (s *server) routes() {
 
 	s.router.Get("/", s.handleIndex())
 
+	s.router.Get("/", s.handleIndex())
+
+	s.router.Route("/api/v1", func(r chi.Router) {
+		r.Get("/now", s.handleNow())
+	})
+
 	// if you want to use a general purpose middleware (http.Handler
 	// wrapper) on a specific HandleFunc route, you need to take the
 	// .ServeHTTP of the http.Handler to get its HandleFunc, viz: