fix: processing invalid GITHUB_TOKEN

gobrew.go

@@ -414,6 +414,9 @@ func (gb *GoBrew) judgeVersion(version string) string {
 				versionsSemantic = append(versionsSemantic, v)
 			}
 		}
+		if len(versionsSemantic) == 0 {
+			return ""
+		}
 
 		// sort semantic versions
 		sort.Sort(semver.Collection(versionsSemantic))
@@ -422,6 +425,9 @@ func (gb *GoBrew) judgeVersion(version string) string {
 			judgedVersions := groupedVersions[versionsSemantic[i].Original()]
 			// get last element
 			if version == "dev-latest" {
+				if len(judgedVersions) == 0 {
+					return ""
+				}
 				return judgedVersions[len(judgedVersions)-1]
 			}
 
@@ -649,26 +655,54 @@ func (gb *GoBrew) getGithubTags(repo string) (result []string) {
 	}
 
 	githubTags = make(map[string][]string)
-	client := &http.Client{}
 	url := "https://api.github.com/repos/kevincobain2000/gobrew/git/refs/tags"
 	if repo == "golang/go" {
 		url = goBrewTagsApi
 	}
+
+	data := doRequest(url, os.Getenv("GITHUB_TOKEN"))
+	if len(data) == 0 && os.Getenv("GITHUB_TOKEN") != "" {
+		color.Warnln("[WARNING] invalid token we are trying a request without a token")
+		data = doRequest(url, "")
+	}
+	if len(data) == 0 {
+		return
+	}
+
+	type Tag struct {
+		Ref string
+	}
+	var tags []Tag
+	utils.CheckError(json.Unmarshal(data, &tags), "==> [Error]")
+
+	for _, tag := range tags {
+		t := strings.ReplaceAll(tag.Ref, "refs/tags/", "")
+		if strings.HasPrefix(t, "v") || strings.HasPrefix(t, "go") {
+			result = append(result, t)
+		}
+	}
+
+	githubTags[repo] = result
+	return
+}
+
+func doRequest(url string, token string) (data []byte) {
+	client := &http.Client{}
 	request, err := http.NewRequest("GET", url, nil)
 	if err != nil {
-		color.Errorf("==> [Error] Cannot create request: %s", err)
+		color.Errorln(fmt.Sprintf("==> [Error] Cannot create request: %s", err))
 		return
 	}
 
 	request.Header.Set("User-Agent", "gobrew")
 
-	if token, ok := os.LookupEnv("GITHUB_TOKEN"); ok {
+	if token != "" {
 		request.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token))
 	}
 
 	response, err := client.Do(request)
 	if err != nil {
-		color.Errorf("==> [Error] Cannot get response: %s", err)
+		color.Errorln(fmt.Sprintf("==> [Error] Cannot get response: %s", err))
 		return
 	}
 
@@ -677,34 +711,20 @@ func (gb *GoBrew) getGithubTags(repo string) (result []string) {
 	}(response.Body)
 
 	if response.StatusCode == http.StatusTooManyRequests {
-		color.Errorf("==> [Error] Rate limit exhausted")
+		color.Errorln("==> [Error] Rate limit exhausted")
 		return
 	}
 
 	if response.StatusCode != http.StatusOK {
-		color.Errorf("==> [Error] Cannot read response: %s", response.Status)
+		color.Errorln(fmt.Sprintf("==> [Error] Cannot read response: %s", response.Status))
 		return
 	}
 
-	data, err := io.ReadAll(response.Body)
+	data, err = io.ReadAll(response.Body)
 	if err != nil {
-		color.Errorf("==> [Error] Cannot read response: %s", err)
+		color.Errorln(fmt.Sprintf("==> [Error] Cannot read response Body: %s", err))
 		return
 	}
 
-	type Tag struct {
-		Ref string
-	}
-	var tags []Tag
-	utils.CheckError(json.Unmarshal(data, &tags), "==> [Error]")
-
-	for _, tag := range tags {
-		t := strings.ReplaceAll(tag.Ref, "refs/tags/", "")
-		if strings.HasPrefix(t, "v") || strings.HasPrefix(t, "go") {
-			result = append(result, t)
-		}
-	}
-
-	githubTags[repo] = result
-	return result
+	return
 }