fix InitCommand() (#285)

split modules/config

login_tasks.go should probably be modules/task/login.go,
but i didn't do that, as it still depends on the global
`Config` variable from the config module, see
https://gitea.com/gitea/tea/issues/158

rework InitCommand()

- make it error tolerant if $PWD is not a git repo (#200)
- don't force default login when repo flag is set (#191)

remove InitCommandLoginOnly()

Merge branch 'master' into issue-200-initcommand

improve docs

Merge branch 'master' into issue-200-initcommand

move config func and config task func to right place

Co-authored-by: Norwin Roosen <git@nroo.de>
Co-authored-by: 6543 <6543@obermui.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/285
Reviewed-by: 6543 <6543@obermui.de>
Reviewed-by: khmarbaise <khmarbaise@noreply.gitea.io>
Co-Authored-By: Norwin <noerw@noreply.gitea.io>
Co-Committed-By: Norwin <noerw@noreply.gitea.io>

modules/config/login_tasks.go

@@ -0,0 +1,126 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package config
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"strings"
+	"time"
+
+	"code.gitea.io/tea/modules/utils"
+
+	"code.gitea.io/sdk/gitea"
+)
+
+// AddLogin add login to config ( global var & file)
+func AddLogin(name, token, user, passwd, sshKey, giteaURL string, insecure bool) error {
+	// checks ...
+	// ... if we have a url
+	if len(giteaURL) == 0 {
+		log.Fatal("You have to input Gitea server URL")
+	}
+
+	err := LoadConfig()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	for _, l := range Config.Logins {
+		// ... if there already exist a login with same name
+		if strings.ToLower(l.Name) == strings.ToLower(name) {
+			return fmt.Errorf("login name '%s' has already been used", l.Name)
+		}
+		// ... if we already use this token
+		if l.Token == token {
+			return fmt.Errorf("token already been used, delete login '%s' first", l.Name)
+		}
+	}
+
+	// .. if we have enough information to authenticate
+	if len(token) == 0 && (len(user)+len(passwd)) == 0 {
+		log.Fatal("No token set")
+	} else if len(user) != 0 && len(passwd) == 0 {
+		log.Fatal("No password set")
+	} else if len(user) == 0 && len(passwd) != 0 {
+		log.Fatal("No user set")
+	}
+
+	// Normalize URL
+	serverURL, err := utils.NormalizeURL(giteaURL)
+	if err != nil {
+		log.Fatal("Unable to parse URL", err)
+	}
+
+	login := Login{
+		Name:     name,
+		URL:      serverURL.String(),
+		Token:    token,
+		Insecure: insecure,
+		SSHKey:   sshKey,
+		Created:  time.Now().Unix(),
+	}
+
+	if len(token) == 0 {
+		login.Token, err = GenerateToken(login.Client(), user, passwd)
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+
+	// Verify if authentication works and get user info
+	u, _, err := login.Client().GetMyUserInfo()
+	if err != nil {
+		log.Fatal(err)
+	}
+	login.User = u.UserName
+
+	if len(login.Name) == 0 {
+		login.Name, err = GenerateLoginName(giteaURL, login.User)
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+
+	// we do not have a method to get SSH config from api,
+	// so we just use the hostname
+	login.SSHHost = serverURL.Hostname()
+
+	// save login to global var
+	Config.Logins = append(Config.Logins, login)
+
+	// save login to config file
+	err = SaveConfig()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	fmt.Printf("Login as %s on %s successful. Added this login as %s\n", login.User, login.URL, login.Name)
+
+	return nil
+}
+
+// GenerateToken creates a new token when given BasicAuth credentials
+func GenerateToken(client *gitea.Client, user, pass string) (string, error) {
+	gitea.SetBasicAuth(user, pass)(client)
+
+	host, _ := os.Hostname()
+	tl, _, err := client.ListAccessTokens(gitea.ListAccessTokensOptions{})
+	if err != nil {
+		return "", err
+	}
+	tokenName := host + "-tea"
+
+	for i := range tl {
+		if tl[i].Name == tokenName {
+			tokenName += time.Now().Format("2006-01-02_15-04-05")
+			break
+		}
+	}
+
+	t, _, err := client.CreateAccessToken(gitea.CreateAccessTokenOption{Name: tokenName})
+	return t.Token, err
+}