feat: Add "coder" CLI (#221)

* feat: Add "coder" CLI

* Add CLI test for login

* Add "bin/coder" target to Makefile

* Update promptui to fix race

* Fix error scope

* Don't run CLI tests on Windows

* Fix requested changes

cli/login.go

@@ -0,0 +1,135 @@
+package cli
+
+import (
+	"fmt"
+	"net/url"
+	"os/user"
+	"strings"
+
+	"github.com/fatih/color"
+	"github.com/go-playground/validator/v10"
+	"github.com/manifoldco/promptui"
+	"github.com/spf13/cobra"
+	"golang.org/x/xerrors"
+
+	"github.com/coder/coder/coderd"
+	"github.com/coder/coder/codersdk"
+)
+
+func login() *cobra.Command {
+	return &cobra.Command{
+		Use:  "login <url>",
+		Args: cobra.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			rawURL := args[0]
+			if !strings.HasPrefix(rawURL, "http://") && !strings.HasPrefix(rawURL, "https://") {
+				scheme := "https"
+				if strings.HasPrefix(rawURL, "localhost") {
+					scheme = "http"
+				}
+				rawURL = fmt.Sprintf("%s://%s", scheme, rawURL)
+			}
+			serverURL, err := url.Parse(rawURL)
+			if err != nil {
+				return xerrors.Errorf("parse raw url %q: %w", rawURL, err)
+			}
+			// Default to HTTPs. Enables simple URLs like: master.cdr.dev
+			if serverURL.Scheme == "" {
+				serverURL.Scheme = "https"
+			}
+
+			client := codersdk.New(serverURL)
+			hasInitialUser, err := client.HasInitialUser(cmd.Context())
+			if err != nil {
+				return xerrors.Errorf("has initial user: %w", err)
+			}
+			if !hasInitialUser {
+				if !isTTY(cmd.InOrStdin()) {
+					return xerrors.New("the initial user cannot be created in non-interactive mode. use the API")
+				}
+				_, _ = fmt.Fprintf(cmd.OutOrStdout(), "%s Your Coder deployment hasn't been set up!\n", color.HiBlackString(">"))
+
+				_, err := runPrompt(cmd, &promptui.Prompt{
+					Label:     "Would you like to create the first user?",
+					IsConfirm: true,
+					Default:   "y",
+				})
+				if err != nil {
+					return xerrors.Errorf("create user prompt: %w", err)
+				}
+				currentUser, err := user.Current()
+				if err != nil {
+					return xerrors.Errorf("get current user: %w", err)
+				}
+				username, err := runPrompt(cmd, &promptui.Prompt{
+					Label:   "What username would you like?",
+					Default: currentUser.Username,
+				})
+				if err != nil {
+					return xerrors.Errorf("pick username prompt: %w", err)
+				}
+
+				organization, err := runPrompt(cmd, &promptui.Prompt{
+					Label:   "What is the name of your organization?",
+					Default: "acme-corp",
+				})
+				if err != nil {
+					return xerrors.Errorf("pick organization prompt: %w", err)
+				}
+
+				email, err := runPrompt(cmd, &promptui.Prompt{
+					Label: "What's your email?",
+					Validate: func(s string) error {
+						err := validator.New().Var(s, "email")
+						if err != nil {
+							return xerrors.New("That's not a valid email address!")
+						}
+						return err
+					},
+				})
+				if err != nil {
+					return xerrors.Errorf("specify email prompt: %w", err)
+				}
+
+				password, err := runPrompt(cmd, &promptui.Prompt{
+					Label: "Enter a password:",
+					Mask:  '*',
+				})
+				if err != nil {
+					return xerrors.Errorf("specify password prompt: %w", err)
+				}
+
+				_, err = client.CreateInitialUser(cmd.Context(), coderd.CreateInitialUserRequest{
+					Email:        email,
+					Username:     username,
+					Password:     password,
+					Organization: organization,
+				})
+				if err != nil {
+					return xerrors.Errorf("create initial user: %w", err)
+				}
+				resp, err := client.LoginWithPassword(cmd.Context(), coderd.LoginWithPasswordRequest{
+					Email:    email,
+					Password: password,
+				})
+				if err != nil {
+					return xerrors.Errorf("login with password: %w", err)
+				}
+				config := createConfig(cmd)
+				err = config.Session().Write(resp.SessionToken)
+				if err != nil {
+					return xerrors.Errorf("write session token: %w", err)
+				}
+				err = config.URL().Write(serverURL.String())
+				if err != nil {
+					return xerrors.Errorf("write server url: %w", err)
+				}
+
+				_, _ = fmt.Fprintf(cmd.OutOrStdout(), "%s Welcome to Coder, %s! You're authenticated.\n", color.HiBlackString(">"), color.HiCyanString(username))
+				return nil
+			}
+
+			return nil
+		},
+	}
+}