server: implement CORS

server/api/api.go

@@ -3,9 +3,12 @@ package api
 import (
 	"context"
 	"net/http"
+	"os"
+	"strings"
 
 	"git.dubyatp.xyz/dubyatp/scannerbot/server/db"
 	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/cors"
 )
 
 func Start() {
@@ -17,6 +20,15 @@ func Start() {
 
 	r := chi.NewRouter()
 
+	r.Use(cors.Handler(cors.Options{
+		AllowedOrigins:   strings.Split(os.Getenv("ALLOWED_ORIGINS"), ","),
+		AllowedMethods:   []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
+		AllowedHeaders:   []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
+		ExposedHeaders:   []string{"Link"},
+		AllowCredentials: true,
+		MaxAge:           300, // preflight request cache
+	}))
+
 	r.Get("/", func(w http.ResponseWriter, r *http.Request) {
 		w.Write([]byte("hello world"))
 	})

server/go.mod

@@ -14,6 +14,7 @@ require (
 
 require (
 	github.com/ajg/form v1.5.1 // indirect
+	github.com/go-chi/cors v1.2.2 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect

server/go.sum

@@ -5,6 +5,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/go-chi/chi/v5 v5.2.5 h1:Eg4myHZBjyvJmAFjFvWgrqDTXFyOzjj7YIm3L3mu6Ug=
 github.com/go-chi/chi/v5 v5.2.5/go.mod h1:X7Gx4mteadT3eDOMTsXzmI4/rwUpOwBHLpAfupzFJP0=
+github.com/go-chi/cors v1.2.2 h1:Jmey33TE+b+rB7fT8MUy1u0I4L+NARQlK6LhzKPSyQE=
+github.com/go-chi/cors v1.2.2/go.mod h1:sSbTewc+6wYHBBCW7ytsFSn836hqM7JxpglAy2Vzc58=
 github.com/go-chi/render v1.0.3 h1:AsXqd2a1/INaIfUSKq3G5uA8weYx20FOsM7uSoCyyt4=
 github.com/go-chi/render v1.0.3/go.mod h1:/gr3hVkmYR0YlEy3LxCuVRFzEu9Ruok+gFqbIofjao0=
 github.com/golang-jwt/jwt v3.2.2+incompatible h1:IfV12K8xAKAnZqdXVzCZ+TOjboZ2keLg81eXfW3O+oY=

server/main.go

@@ -10,7 +10,7 @@ import (
 )
 
 var REQUIRED_ENVS = [...]string{
-	"DATABASE_URL", "JWT_SECRET", "FILE_BACKEND",
+	"DATABASE_URL", "JWT_SECRET", "FILE_BACKEND", "ALLOWED_ORIGINS",
 }
 
 func checkEnvVars(keys []string) (bool, []string) {