feat: config file as option (#42)

Fix https://github.com/lampajr/backporting/issues/37

This enhancement required a huge refactoring where all arguments
defaults have been centralized in one single place ArgsParser#parse

src/service/git/git-cli.ts

@@ -10,10 +10,10 @@ import { LocalGit } from "@bp/service/configs/configs.types";
 export default class GitCLIService {
 
   private readonly logger: LoggerService;
-  private readonly auth: string;
+  private readonly auth: string | undefined;
   private readonly gitData: LocalGit;
 
-  constructor(auth: string, gitData: LocalGit) {
+  constructor(auth: string | undefined, gitData: LocalGit) {
     this.logger = LoggerServiceFactory.getLogger();
     this.auth  = auth;
     this.gitData = gitData;

src/service/git/git-client-factory.ts

@@ -26,7 +26,7 @@ export default class GitClientFactory {
    * @param type git management service type
    * @param authToken authentication token, like github/gitlab token
    */
-  public static getOrCreate(type: GitClientType, authToken: string, apiUrl: string): GitClient {
+  public static getOrCreate(type: GitClientType, authToken: string | undefined, apiUrl: string): GitClient {
 
     if (GitClientFactory.instance) {
       GitClientFactory.logger.warn("Git service already initialized!");

src/service/git/git-client.ts

@@ -7,6 +7,10 @@ import { BackportPullRequest, GitPullRequest } from "@bp/service/git/git.types";
  export default interface GitClient {
 
   // READ
+  
+  getDefaultGitUser(): string;
+
+  getDefaultGitEmail(): string;
 
   /**
    * Get a pull request object from the underneath git service

src/service/git/github/github-client.ts

@@ -14,7 +14,7 @@ export default class GitHubClient implements GitClient {
   private octokit: Octokit;
   private mapper: GitHubMapper;
 
-  constructor(token: string, apiUrl: string) {
+  constructor(token: string | undefined, apiUrl: string) {
     this.apiUrl = apiUrl;
     this.logger = LoggerServiceFactory.getLogger();
     this.octokit = OctokitFactory.getOctokit(token, this.apiUrl);
@@ -23,6 +23,14 @@ export default class GitHubClient implements GitClient {
 
   // READ
 
+  getDefaultGitUser(): string {
+    return "GitHub";
+  }
+  
+  getDefaultGitEmail(): string {
+    return "noreply@github.com";
+  }
+
   async getPullRequest(owner: string, repo: string, prNumber: number): Promise<GitPullRequest> {
     this.logger.info(`Getting pull request ${owner}/${repo}/${prNumber}.`);
     const { data } = await this.octokit.rest.pulls.get({

src/service/git/github/octokit-factory.ts

@@ -10,7 +10,7 @@ export default class OctokitFactory {
   private static logger: LoggerService = LoggerServiceFactory.getLogger();
   private static octokit?: Octokit;
 
-  public static getOctokit(token: string, apiUrl: string): Octokit {
+  public static getOctokit(token: string | undefined, apiUrl: string): Octokit {
     if (!OctokitFactory.octokit) {
       OctokitFactory.logger.info("Creating octokit instance.");
       OctokitFactory.octokit = new Octokit({

src/service/git/gitlab/gitlab-client.ts

@@ -14,13 +14,13 @@ export default class GitLabClient implements GitClient {
   private readonly mapper: GitLabMapper;
   private readonly client: Axios;
 
-  constructor(token: string, apiUrl: string, rejectUnauthorized = false) {
+  constructor(token: string | undefined, apiUrl: string, rejectUnauthorized = false) {
     this.logger = LoggerServiceFactory.getLogger();
     this.apiUrl = apiUrl;
     this.client = axios.create({
       baseURL: this.apiUrl,
       headers: {
-        Authorization: `Bearer ${token}`,
+        Authorization: token ? `Bearer ${token}` : "",
         "User-Agent": "lampajr/backporting",
       },
       httpsAgent: new https.Agent({  
@@ -30,6 +30,14 @@ export default class GitLabClient implements GitClient {
     this.mapper = new GitLabMapper(this.client);
   }
 
+  getDefaultGitUser(): string {
+    return "Gitlab";
+  }
+  
+  getDefaultGitEmail(): string {
+    return "noreply@gitlab.com";
+  }
+
   // READ
 
   // example: <host>/api/v4/projects/alampare%2Fbackporting-example/merge_requests/1