Fix CORS by allowing everything

cors.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+	"net/http"
+)
+
+type CorsAllowAllOrigins struct {
+	AndThen http.Handler
+}
+
+func (c CorsAllowAllOrigins) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	w.Header().Add("Access-Control-Allow-Origin", "*")
+	w.Header().Add("Access-Control-Allow-Methods", "*")
+	w.Header().Add("Access-Control-Allow-Headers", "*")
+	c.AndThen.ServeHTTP(w, r)
+}
+
+type OptionsNoError struct {
+	Error ErrorHandler
+}
+
+func (c OptionsNoError) WithError(err error) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method == "OPTIONS" {
+			w.WriteHeader(200)
+		} else {
+			c.Error.WithError(err).ServeHTTP(w, r)
+		}
+	})
+}

main.go

@@ -3,17 +3,18 @@ package main
 import (
 	"context"
 	"fmt"
-	"git.deuxfleurs.fr/Deuxfleurs/bagage/s3"
-	"git.deuxfleurs.fr/Deuxfleurs/bagage/sftp"
-	"github.com/minio/minio-go/v7"
-	"github.com/minio/minio-go/v7/pkg/credentials"
-	"golang.org/x/crypto/ssh"
 	"io"
 	"io/ioutil"
 	"log"
 	"net"
 	"net/http"
 	"os"
+
+	"git.deuxfleurs.fr/Deuxfleurs/bagage/s3"
+	"git.deuxfleurs.fr/Deuxfleurs/bagage/sftp"
+	"github.com/minio/minio-go/v7"
+	"github.com/minio/minio-go/v7/pkg/credentials"
+	"golang.org/x/crypto/ssh"
 )
 
 func main() {
@@ -176,17 +177,23 @@ func handleSSHConn(nConn net.Conn, dconfig *Config, config *ssh.ServerConfig) {
 func httpServer(config *Config, done chan error) {
 	// Assemble components to handle WebDAV requests
 	http.Handle(config.DavPath+"/",
-		BasicAuthExtract{
-			OnNotFound: NotAuthorized{},
-			OnCreds: LdapPreAuth{
-				WithConfig:      config,
-				OnWrongPassword: NotAuthorized{},
-				OnFailure:       InternalError{},
-				OnCreds: S3Auth{
+		CorsAllowAllOrigins{
+			AndThen: BasicAuthExtract{
+				OnNotFound: OptionsNoError{
+					NotAuthorized{},
+				},
+				OnCreds: LdapPreAuth{
 					WithConfig: config,
-					OnFailure:  InternalError{},
-					OnMinioClient: WebDav{
+					OnWrongPassword: OptionsNoError{
+						Error: NotAuthorized{},
+					},
+					OnFailure: InternalError{},
+					OnCreds: S3Auth{
 						WithConfig: config,
+						OnFailure:  InternalError{},
+						OnMinioClient: WebDav{
+							WithConfig: config,
+						},
 					},
 				},
 			},