feat: add username and password login (#418)

* feat: add username and password login

* fix: make sure cookie is not empty

* chore: go mod tidy

* fix: prevent local config from influencing tests

* fix: small cleanup on error handling

* fix: remove unnecessary trim

clients/config/config.go

@@ -1,6 +1,7 @@
 package config
 
 import (
+	"encoding/base64"
 	"errors"
 	"fmt"
 	"net/url"
@@ -47,6 +48,18 @@ func (c Client) Create(cfg config.Config) error {
 	return c.printConfigs(configPrintOpts{config: &cfg})
 }
 
+func (c Client) CreateWithUserPass(cfg config.Config, userPass string) error {
+	if userPass != "" && cfg.Token != "" {
+		return fmt.Errorf("token and username-password cannot be specified together, please choose just one")
+	}
+
+	if cfg.Token == "" && userPass != "" {
+		cfg.Cookie = base64.StdEncoding.EncodeToString([]byte(userPass))
+	}
+
+	return c.Create(cfg)
+}
+
 func (c Client) Delete(names []string) error {
 	deleted := make(config.Configs)
 	for _, name := range names {

clients/signin/signin.go

@@ -0,0 +1,56 @@
+package signin
+
+import (
+	"context"
+	"encoding/base64"
+	"fmt"
+	"strings"
+	"syscall"
+
+	"github.com/influxdata/influx-cli/v2/api"
+	"golang.org/x/term"
+)
+
+func GetCookie(ctx context.Context, params api.ConfigParams, userPass string) (string, error) {
+	bufUserPass, err := base64.StdEncoding.DecodeString(userPass)
+	if err != nil {
+		return "", err
+	}
+
+	splitUserPass := strings.Split(string(bufUserPass), ":")
+	if len(splitUserPass) < 1 {
+		return "", fmt.Errorf("bad config")
+	}
+	username := splitUserPass[0]
+	var password string
+	if len(splitUserPass) != 2 {
+		fmt.Print("Please provide your password: ")
+		bytePassword, err := term.ReadPassword(int(syscall.Stdin))
+		if err != nil {
+			return "", err
+		}
+		password = string(bytePassword)
+		fmt.Println()
+	} else {
+		password = splitUserPass[1]
+	}
+
+	cfg := api.NewAPIConfig(params)
+	client := api.NewAPIClient(cfg)
+	ctx = context.WithValue(ctx, api.ContextBasicAuth, api.BasicAuth{
+		UserName: username,
+		Password: password,
+	})
+	res, err := client.SigninApi.PostSignin(ctx).ExecuteWithHttpInfo()
+	if err != nil {
+		emsg := fmt.Errorf("error signing in, verify signin was not called against cloud influxdb: %w", err)
+		return "", emsg
+	}
+
+	cookies := res.Cookies()
+	if len(cookies) != 1 {
+		return "", fmt.Errorf("failure getting session cookie, multiple cookies")
+	}
+
+	return cookies[0].Value, nil
+}