[RelayMiner] Support https backend urls (#507)

pkg/relayer/config/proxy_http_config_parser.go

@@ -26,11 +26,11 @@ func (serverConfig *RelayMinerServerConfig) parseHTTPServerConfig(
  return nil
 }
 
-// parseHTTPSupplierConfig populates the supplier fields of the target structure
-// that are relevant to "http" specific service configurations.
+// parseSupplierBackendUrl populates the supplier fields of the target structure
+// that are relevant to "http" and "https" backend url service configurations.
 // This function alters the target RelayMinerSupplierServiceConfig structure
 // as a side effect.
-func (supplierServiceConfig *RelayMinerSupplierServiceConfig) parseHTTPSupplierConfig(
+func (supplierServiceConfig *RelayMinerSupplierServiceConfig) parseSupplierBackendUrl(
  yamlSupplierServiceConfig YAMLRelayMinerSupplierServiceConfig,
 ) error {
  // Check if the supplier backend url is empty

pkg/relayer/config/supplier_hydrator.go

@@ -68,10 +68,10 @@ func (supplierConfig *RelayMinerSupplierConfig) HydrateSupplier(
  // by their own functions.
  supplierConfig.ServiceConfig = &RelayMinerSupplierServiceConfig{}
  switch backendUrl.Scheme {
- case "http":
+ case "http", "https":
  supplierConfig.ServerType = RelayMinerServerTypeHTTP
  if err := supplierConfig.ServiceConfig.
- parseHTTPSupplierConfig(yamlSupplierConfig.ServiceConfig); err != nil {
+ parseSupplierBackendUrl(yamlSupplierConfig.ServiceConfig); err != nil {
  return err
  }
  default:

pkg/relayer/proxy/synchronous.go

@@ -4,6 +4,7 @@ import (
  "bytes"
  "compress/gzip"
  "context"
+ "crypto/tls"
  "fmt"
  "io"
  "net/http"
@@ -277,8 +278,21 @@ func (sync *synchronousRPCServer) serveHTTP(
  relayHTTPRequest.Header.Add(key, value)
  }
 
+ // Configure the HTTP client to use the appropriate transport based on the
+ // backend URL scheme.
+ var client *http.Client
+ switch serviceConfig.BackendUrl.Scheme {
+ case "https":
+ transport := &http.Transport{
+ TLSClientConfig: &tls.Config{},
+ }
+ client = &http.Client{Transport: transport}
+ default:
+ client = http.DefaultClient
+ }
+
  // Send the relay request to the native service.
- httpResponse, err := http.DefaultClient.Do(relayHTTPRequest)
+ httpResponse, err := client.Do(relayHTTPRequest)
  if err != nil {
  return nil, err
  }