finish code validation, start on key handling

cmd/help/main.go

@@ -2,12 +2,14 @@ package main
 
 import (
 	"database/sql"
+	"errors"
 	"fmt"
 	"os"
 	"strconv"
 	"strings"
 
 	"git.tilde.town/tildetown/town/codes"
+	"git.tilde.town/tildetown/town/sshkey"
 	"git.tilde.town/tildetown/town/towndb"
 	"github.com/charmbracelet/lipgloss"
 	_ "github.com/mattn/go-sqlite3"
@@ -24,6 +26,7 @@ type colorScheme struct {
 	Prompt   func(string) string
 	Email    func(string) string
 	Option   func(string) string
+	Error    func(string) string
 }
 
 func newColorScheme() colorScheme {
@@ -40,6 +43,7 @@ func newColorScheme() colorScheme {
 		Email:    s2r(s().Bold(true).Underline(true)),
 		Prompt:   s2r(s().Bold(true).Foreground(c("#00752d"))),
 		Option:   s2r(s().Bold(true).Foreground(c("#38747a"))),
+		Error:    s2r(s().Bold(true).Foreground(c("#f43124"))),
 	}
 }
 
@@ -101,13 +105,12 @@ func (p *Prompter) Select(prompt string, opts []string) (int, error) {
 	return chosen, nil
 }
 
-func _main() error {
+func _main(cs colorScheme) error {
 	db, err := towndb.ConnectDB()
 	if err != nil {
 		return fmt.Errorf("could not connect to database. please let root@tilde.town know about this.")
 	}
 
-	cs := newColorScheme()
 	fmt.Println(cs.Header("Hi, you have reached the tilde town help desk."))
 	fmt.Println()
 	fmt.Println("Please check out the options below.")
@@ -204,19 +207,18 @@ func collectEmail(db *sql.DB, cs colorScheme, p *Prompter) error {
 func redeemCode(db *sql.DB, cs colorScheme, p *Prompter) error {
 	fmt.Println(cs.Header("redeem an auth code and add a new public key"))
 	fmt.Println()
-	c, err := p.String("paste your auth code:")
-	// TODO add Error to cs
+	c, err := p.String("paste your auth code and hit enter to submit:")
 	if err != nil {
 		// TODO log
-		// TODO print an error, return nil
-		return err
+		fmt.Println(cs.Error("sorry, I couldn't read that."))
+		return nil
 	}
 
 	parts, err := codes.Decode(c)
 	if err != nil {
 		// TODO log
-		// TODO print an error, return nil
-		return err
+		fmt.Println(cs.Error("sorry, that doesn't look like an auth code..."))
+		return nil
 	}
 
 	code := &towndb.AuthCode{
@@ -227,27 +229,51 @@ func redeemCode(db *sql.DB, cs colorScheme, p *Prompter) error {
 	err = code.Hydrate(db)
 	if err != nil {
 		// TODO log
-		// TODO print an error, return an opaque error about db
-		return err
+		return errors.New("the database is sad")
 	}
 
 	if code.Used {
-		fmt.Println("That code has already been redeemed. You'll have to request a new one.")
+		fmt.Println(cs.Error("That code has already been redeemed. You'll have to request a new one."))
 		return nil
 	}
 
-	// TODO verify code
-	// TODO accept key
-	// TODO verify key
-	// TODO add key to .authorized_keys2
+	user, err := towndb.UserForEmail(db, code.Email)
+	if err != nil || user == nil {
+		fmt.Println(cs.Error("That code doesn't seem to match an account."))
+		// TODO log
+		return nil
+	}
+
+	key, err := p.String("paste your new public key and hit enter to submit:")
+	if err != nil {
+		// TODO log
+		fmt.Println(cs.Error("sorry, I couldn't read that."))
+		return nil
+	}
+
+	valid, err := sshkey.ValidKey(key)
+	if err != nil {
+		return fmt.Errorf("failed to validate key: %w", err)
+	}
+
+	if !valid {
+		errMsg := fmt.Sprintf("that key is invalid: %s", err.Error())
+		fmt.Println(cs.Error(errMsg))
+		return nil
+	}
+
+	// TODO need to create a new helper: appendkeyfile and use sudoers to allow help to call it. also need to add help user and add it to /etc/ssh/sshd_config
+
 	// TODO mark used
 	return nil
 }
 
 func main() {
-	err := _main()
+	cs := newColorScheme()
+	err := _main(cs)
 	if err != nil {
-		fmt.Printf("sorry, something went wrong: %s\n", err.Error())
+		fmt.Println(
+			cs.Error(fmt.Sprintf("sorry, something went wrong: %s", err.Error())))
 		fmt.Println("Please let an admin know by emailing a copy of this error to root@tilde.town")
 		os.Exit(1)
 	}