Use global index url

Author: cmaglie

arduino/cores/cores.go

@@ -21,9 +21,11 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/url"
+	"path/filepath"
 	"sort"
 	"strings"
 
+	"github.com/arduino/arduino-cli/arduino/globals"
 	"github.com/arduino/arduino-cli/arduino/resources"
 	"github.com/arduino/arduino-cli/arduino/utils"
 	"github.com/arduino/arduino-cli/i18n"
@@ -360,8 +362,13 @@ func (release *PlatformRelease) String() string {
 
 // ToRPCPlatformReference creates a gRPC PlatformReference message out of this PlatformRelease
 func (release *PlatformRelease) ToRPCPlatformReference() *rpc.InstalledPlatformReference {
+	defaultUrlPrefix := globals.DefaultIndexURL
+	// TODO: create a IndexURL object to factorize this
+	defaultUrlPrefix = strings.TrimSuffix(defaultUrlPrefix, filepath.Ext(defaultUrlPrefix))
+	defaultUrlPrefix = strings.TrimSuffix(defaultUrlPrefix, filepath.Ext(defaultUrlPrefix)) // removes .tar.bz2
+
 	url := release.Platform.Package.URL
-	if strings.HasPrefix(url, "https://downloads.arduino.cc/packages/package_index.") {
+	if strings.HasPrefix(url, defaultUrlPrefix) {
 		url = ""
 	}
 	return &rpc.InstalledPlatformReference{