Use api.Client for http request in src version (#411)

This fixes us not using any authentication in the src version command, because the api.Client adds the Authorization header to the request automatically.

CHANGELOG.md

@@ -17,6 +17,8 @@ All notable changes to `src-cli` are documented in this file.
 
 ### Fixed
 
+- The src version command didn't send any authentication headers before, which could have failed for some instance configurations. The authentication header is now properly set for the request done in this command. [#411](https://github.com/sourcegraph/src-cli/pull/411)
+
 ### Removed
 
 ## 3.23.0

cmd/src/version.go

@@ -1,12 +1,14 @@
 package main
 
 import (
+	"context"
 	"encoding/json"
 	"flag"
 	"fmt"
 	"io/ioutil"
 	"net/http"
-	"net/url"
+
+	"github.com/sourcegraph/src-cli/internal/api"
 )
 
 // buildTag is the git tag at the time of build and is used to
@@ -25,10 +27,13 @@ Examples:
 
 	flagSet := flag.NewFlagSet("version", flag.ExitOnError)
 
+	var apiFlags = api.NewFlags(flagSet)
+
 	handler := func(args []string) error {
 		fmt.Printf("Current version: %s\n", buildTag)
 
-		recommendedVersion, err := getRecommendedVersion()
+		client := cfg.apiClient(apiFlags, flagSet.Output())
+		recommendedVersion, err := getRecommendedVersion(context.Background(), client)
 		if err != nil {
 			return err
 		}
@@ -53,20 +58,12 @@ Examples:
 	})
 }
 
-func getRecommendedVersion() (string, error) {
-	url, err := url.Parse(cfg.Endpoint + "/.api/src-cli/version")
+func getRecommendedVersion(ctx context.Context, client api.Client) (string, error) {
+	req, err := client.NewHTTPRequest(ctx, "GET", ".api/src-cli/version", nil)
 	if err != nil {
 		return "", err
 	}
 
-	req, err := http.NewRequest("GET", url.String(), nil)
-	if err != nil {
-		return "", err
-	}
-	for k, v := range cfg.AdditionalHeaders {
-		req.Header.Set(k, v)
-	}
-
 	resp, err := http.DefaultClient.Do(req)
 	if err != nil {
 		return "", err