53 lines
1.5 KiB
Go
53 lines
1.5 KiB
Go
package server
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import (
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"log"
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"net/http"
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"net/url"
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"os"
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"path"
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"strings"
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"github.com/gorilla/mux"
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)
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func CORSMiddleware(devMode bool) mux.MiddlewareFunc {
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
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methods := []string{http.MethodGet, http.MethodPost, http.MethodOptions}
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headers := []string{"authorization", "content-type", "content-length"}
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w.Header().Set("Access-Control-Allow-Methods", strings.Join(methods, ","))
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w.Header().Set("Access-Control-Allow-Headers", strings.Join(headers, ","))
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w.Header().Set("Access-Control-Expose-Headers", "content-length")
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endpoint, err := url.Parse(os.Getenv("API_ENDPOINT"))
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if err != nil {
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log.Fatalln("Could not parse API_ENDPOINT environment variable as url")
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}
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endpoint.Path = path.Join(endpoint.Path, "graphql")
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if devMode {
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// Development environment
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w.Header().Set("Access-Control-Allow-Origin", req.Header.Get("origin"))
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w.Header().Set("Vary", "Origin")
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} else {
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// Production environment
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publicEndpoint, err := url.Parse(os.Getenv("PUBLIC_ENDPOINT"))
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if err != nil {
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log.Printf("Error parsing environment variable PUBLIC_ENDPOINT as url: %s", err)
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} else {
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w.Header().Set("Access-Control-Allow-Origin", publicEndpoint.Scheme+"://"+publicEndpoint.Host)
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}
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}
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if req.Method != http.MethodOptions {
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next.ServeHTTP(w, req)
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} else {
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w.WriteHeader(200)
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}
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})
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}
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}
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