git.r.bdr.sh - rbdr/mobius/blob - client.go

   1 package hotline
   2
   3 import (
   4         "bytes"
   5         "embed"
   6         "encoding/binary"
   7         "errors"
   8         "fmt"
   9         "github.com/davecgh/go-spew/spew"
  10         "github.com/gdamore/tcell/v2"
  11         "github.com/rivo/tview"
  12         "github.com/stretchr/testify/mock"
  13         "go.uber.org/zap"
  14         "gopkg.in/yaml.v2"
  15         "io/ioutil"
  16         "math/big"
  17         "math/rand"
  18         "net"
  19         "os"
  20         "strconv"
  21         "strings"
  22         "time"
  23 )
  24
  25 const clientConfigPath = "/usr/local/etc/mobius-client-config.yaml"
  26 const (
  27         trackerListPage = "trackerList"
  28 )
  29
  30 //go:embed client/banners/*.txt
  31 var bannerDir embed.FS
  32
  33 type Bookmark struct {
  34         Name     string `yaml:"Name"`
  35         Addr     string `yaml:"Addr"`
  36         Login    string `yaml:"Login"`
  37         Password string `yaml:"Password"`
  38 }
  39
  40 type ClientPrefs struct {
  41         Username  string     `yaml:"Username"`
  42         IconID    int        `yaml:"IconID"`
  43         Bookmarks []Bookmark `yaml:"Bookmarks"`
  44         Tracker   string     `yaml:"Tracker"`
  45 }
  46
  47 func (cp *ClientPrefs) IconBytes() []byte {
  48         iconBytes := make([]byte, 2)
  49         binary.BigEndian.PutUint16(iconBytes, uint16(cp.IconID))
  50         return iconBytes
  51 }
  52
  53 func readConfig(cfgPath string) (*ClientPrefs, error) {
  54         fh, err := os.Open(cfgPath)
  55         if err != nil {
  56                 return nil, err
  57         }
  58
  59         prefs := ClientPrefs{}
  60         decoder := yaml.NewDecoder(fh)
  61         decoder.SetStrict(true)
  62         if err := decoder.Decode(&prefs); err != nil {
  63                 return nil, err
  64         }
  65         return &prefs, nil
  66 }
  67
  68 type Client struct {
  69         DebugBuf    *DebugBuffer
  70         Connection  net.Conn
  71         Login       *[]byte
  72         Password    *[]byte
  73         Flags       *[]byte
  74         ID          *[]byte
  75         Version     []byte
  76         UserAccess  []byte
  77         Agreed      bool
  78         UserList    []User
  79         Logger      *zap.SugaredLogger
  80         activeTasks map[uint32]*Transaction
  81
  82         pref *ClientPrefs
  83
  84         Handlers map[uint16]clientTHandler
  85
  86         UI *UI
  87
  88         outbox chan *Transaction
  89         Inbox  chan *Transaction
  90 }
  91
  92 type UI struct {
  93         chatBox      *tview.TextView
  94         chatInput    *tview.InputField
  95         App          *tview.Application
  96         Pages        *tview.Pages
  97         userList     *tview.TextView
  98         agreeModal   *tview.Modal
  99         trackerList  *tview.List
 100         settingsPage *tview.Box
 101         HLClient     *Client
 102 }
 103
 104 func NewUI(c *Client) *UI {
 105         app := tview.NewApplication()
 106         chatBox := tview.NewTextView().
 107                 SetScrollable(true).
 108                 SetDynamicColors(true).
 109                 SetWordWrap(true).
 110                 SetChangedFunc(func() {
 111                         app.Draw() // TODO: docs say this is bad but it's the only way to show content during initial render??
 112                 })
 113         chatBox.Box.SetBorder(true).SetTitle("Chat")
 114
 115         chatInput := tview.NewInputField()
 116         chatInput.
 117                 SetLabel("> ").
 118                 SetFieldBackgroundColor(tcell.ColorDimGray).
 119                 SetDoneFunc(func(key tcell.Key) {
 120                         // skip send if user hit enter with no other text
 121                         if len(chatInput.GetText()) == 0 {
 122                                 return
 123                         }
 124
 125                         c.Send(
 126                                 *NewTransaction(tranChatSend, nil,
 127                                         NewField(fieldData, []byte(chatInput.GetText())),
 128                                 ),
 129                         )
 130                         chatInput.SetText("") // clear the input field after chat send
 131                 })
 132
 133         chatInput.Box.SetBorder(true).SetTitle("Send")
 134
 135         userList := tview.
 136                 NewTextView().
 137                 SetDynamicColors(true).
 138                 SetChangedFunc(func() {
 139                         app.Draw() // TODO: docs say this is bad but it's the only way to show content during initial render??
 140                 })
 141         userList.Box.SetBorder(true).SetTitle("Users")
 142
 143         return &UI{
 144                 App:         app,
 145                 chatBox:     chatBox,
 146                 Pages:       tview.NewPages(),
 147                 chatInput:   chatInput,
 148                 userList:    userList,
 149                 trackerList: tview.NewList(),
 150                 agreeModal:  tview.NewModal(),
 151                 HLClient:    c,
 152         }
 153 }
 154
 155 func (ui *UI) showBookmarks() *tview.List {
 156         list := tview.NewList()
 157         list.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
 158                 if event.Key() == tcell.KeyEsc {
 159                         ui.Pages.SwitchToPage("home")
 160                 }
 161                 return event
 162         })
 163         list.Box.SetBorder(true).SetTitle("| Bookmarks |")
 164
 165         shortcut := 97 // rune for "a"
 166         for i, srv := range ui.HLClient.pref.Bookmarks {
 167                 addr := srv.Addr
 168                 login := srv.Login
 169                 pass := srv.Password
 170                 list.AddItem(srv.Name, srv.Addr, rune(shortcut+i), func() {
 171                         ui.Pages.RemovePage("joinServer")
 172
 173                         newJS := ui.renderJoinServerForm(addr, login, pass, "bookmarks", true, true)
 174
 175                         ui.Pages.AddPage("joinServer", newJS, true, true)
 176                 })
 177         }
 178
 179         return list
 180 }
 181
 182 func (ui *UI) getTrackerList() *tview.List {
 183         listing, err := GetListing(ui.HLClient.pref.Tracker)
 184         if err != nil {
 185                 spew.Dump(err)
 186         }
 187
 188         list := tview.NewList()
 189         list.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
 190                 if event.Key() == tcell.KeyEsc {
 191                         ui.Pages.SwitchToPage("home")
 192                 }
 193                 return event
 194         })
 195         list.Box.SetBorder(true).SetTitle("| Servers |")
 196
 197         shortcut := 97 // rune for "a"
 198         for i, srv := range listing {
 199                 addr := srv.Addr()
 200                 list.AddItem(string(srv.Name), string(srv.Description), rune(shortcut+i), func() {
 201                         ui.Pages.RemovePage("joinServer")
 202
 203                         newJS := ui.renderJoinServerForm(addr, GuestAccount, "", trackerListPage, false, true)
 204
 205                         ui.Pages.AddPage("joinServer", newJS, true, true)
 206                         ui.Pages.ShowPage("joinServer")
 207                 })
 208         }
 209
 210         return list
 211 }
 212
 213 func (ui *UI) renderSettingsForm() *tview.Flex {
 214         iconStr := strconv.Itoa(ui.HLClient.pref.IconID)
 215         settingsForm := tview.NewForm()
 216         settingsForm.AddInputField("Your Name", ui.HLClient.pref.Username, 0, nil, nil)
 217         settingsForm.AddInputField("IconID", iconStr, 0, func(idStr string, _ rune) bool {
 218                 _, err := strconv.Atoi(idStr)
 219                 return err == nil
 220         }, nil)
 221         settingsForm.AddInputField("Tracker", ui.HLClient.pref.Tracker, 0, nil, nil)
 222         settingsForm.AddButton("Save", func() {
 223                 usernameInput := settingsForm.GetFormItem(0).(*tview.InputField).GetText()
 224                 if len(usernameInput) == 0 {
 225                         usernameInput = "unnamed"
 226                 }
 227                 ui.HLClient.pref.Username = usernameInput
 228                 iconStr = settingsForm.GetFormItem(1).(*tview.InputField).GetText()
 229                 ui.HLClient.pref.IconID, _ = strconv.Atoi(iconStr)
 230                 ui.HLClient.pref.Tracker = settingsForm.GetFormItem(2).(*tview.InputField).GetText()
 231
 232                 out, err := yaml.Marshal(&ui.HLClient.pref)
 233                 if err != nil {
 234                         // TODO: handle err
 235                 }
 236                 // TODO: handle err
 237                 _ = ioutil.WriteFile(clientConfigPath, out, 0666)
 238                 ui.Pages.RemovePage("settings")
 239         })
 240         settingsForm.SetBorder(true)
 241         settingsForm.SetCancelFunc(func() {
 242                 ui.Pages.RemovePage("settings")
 243         })
 244         settingsPage := tview.NewFlex().SetDirection(tview.FlexRow)
 245         settingsPage.Box.SetBorder(true).SetTitle("Settings")
 246         settingsPage.AddItem(settingsForm, 0, 1, true)
 247
 248         centerFlex := tview.NewFlex().
 249                 AddItem(nil, 0, 1, false).
 250                 AddItem(tview.NewFlex().
 251                         SetDirection(tview.FlexRow).
 252                         AddItem(nil, 0, 1, false).
 253                         AddItem(settingsForm, 15, 1, true).
 254                         AddItem(nil, 0, 1, false), 40, 1, true).
 255                 AddItem(nil, 0, 1, false)
 256
 257         return centerFlex
 258 }
 259
 260 // DebugBuffer wraps a *tview.TextView and adds a Sync() method to make it available as a Zap logger
 261 type DebugBuffer struct {
 262         TextView *tview.TextView
 263 }
 264
 265 func (db *DebugBuffer) Write(p []byte) (int, error) {
 266         return db.TextView.Write(p)
 267 }
 268
 269 // Sync is a noop function that exists to satisfy the zapcore.WriteSyncer interface
 270 func (db *DebugBuffer) Sync() error {
 271         return nil
 272 }
 273
 274 func (ui *UI) joinServer(addr, login, password string) error {
 275         if err := ui.HLClient.JoinServer(addr, login, password); err != nil {
 276                 return errors.New(fmt.Sprintf("Error joining server: %v\n", err))
 277         }
 278
 279         go func() {
 280                 err := ui.HLClient.ReadLoop()
 281                 if err != nil {
 282                         ui.HLClient.Logger.Errorw("read error", "err", err)
 283                 }
 284         }()
 285         return nil
 286 }
 287
 288 func (ui *UI) renderJoinServerForm(server, login, password, backPage string, save, defaultConnect bool) *tview.Flex {
 289         joinServerForm := tview.NewForm()
 290         joinServerForm.
 291                 AddInputField("Server", server, 0, nil, nil).
 292                 AddInputField("Login", login, 0, nil, nil).
 293                 AddPasswordField("Password", password, 0, '*', nil).
 294                 AddCheckbox("Save", save, func(checked bool) {
 295                         // TODO: Implement bookmark saving
 296                 }).
 297                 AddButton("Cancel", func() {
 298                         ui.Pages.SwitchToPage(backPage)
 299                 }).
 300                 AddButton("Connect", func() {
 301                         err := ui.joinServer(
 302                                 joinServerForm.GetFormItem(0).(*tview.InputField).GetText(),
 303                                 joinServerForm.GetFormItem(1).(*tview.InputField).GetText(),
 304                                 joinServerForm.GetFormItem(2).(*tview.InputField).GetText(),
 305                         )
 306                         if err != nil {
 307                                 ui.HLClient.Logger.Errorw("login error", "err", err)
 308                                 loginErrModal := tview.NewModal().
 309                                         AddButtons([]string{"Oh no"}).
 310                                         SetText(err.Error()).
 311                                         SetDoneFunc(func(buttonIndex int, buttonLabel string) {
 312                                                 ui.Pages.SwitchToPage(backPage)
 313                                         })
 314
 315                                 ui.Pages.AddPage("loginErr", loginErrModal, false, true)
 316                         }
 317
 318                         // Save checkbox
 319                         if joinServerForm.GetFormItem(3).(*tview.Checkbox).IsChecked() {
 320                                 // TODO: implement bookmark saving
 321                         }
 322                 })
 323
 324         joinServerForm.Box.SetBorder(true).SetTitle("| Connect |")
 325         joinServerForm.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
 326                 if event.Key() == tcell.KeyEscape {
 327                         ui.Pages.SwitchToPage(backPage)
 328                 }
 329                 return event
 330         })
 331
 332         if defaultConnect {
 333                 joinServerForm.SetFocus(5)
 334         }
 335
 336         joinServerPage := tview.NewFlex().
 337                 AddItem(nil, 0, 1, false).
 338                 AddItem(tview.NewFlex().
 339                         SetDirection(tview.FlexRow).
 340                         AddItem(nil, 0, 1, false).
 341                         AddItem(joinServerForm, 14, 1, true).
 342                         AddItem(nil, 0, 1, false), 40, 1, true).
 343                 AddItem(nil, 0, 1, false)
 344
 345         return joinServerPage
 346 }
 347
 348 func randomBanner() string {
 349         rand.Seed(time.Now().UnixNano())
 350
 351         bannerFiles, _ := bannerDir.ReadDir("client/banners")
 352         file, _ := bannerDir.ReadFile("client/banners/" + bannerFiles[rand.Intn(len(bannerFiles))].Name())
 353
 354         return fmt.Sprintf("\n\n\nWelcome to...\n\n[red::b]%s[-:-:-]\n\n", file)
 355 }
 356
 357 func (ui *UI) renderServerUI() *tview.Flex {
 358         commandList := tview.NewTextView().SetDynamicColors(true)
 359         commandList.
 360                 SetText("[yellow]^n[-::]: Read News   [yellow]^p[-::]: Post News\n[yellow]^l[-::]: View Logs\n").
 361                 SetBorder(true).
 362                 SetTitle("Keyboard Shortcuts")
 363
 364         modal := tview.NewModal().
 365                 SetText("Disconnect from the server?").
 366                 AddButtons([]string{"Cancel", "Exit"}).
 367                 SetFocus(1)
 368         modal.SetDoneFunc(func(buttonIndex int, buttonLabel string) {
 369                 if buttonIndex == 1 {
 370                         _ = ui.HLClient.Disconnect()
 371                         ui.Pages.SwitchToPage("home")
 372                 } else {
 373                         ui.Pages.HidePage("modal")
 374                 }
 375         })
 376
 377         serverUI := tview.NewFlex().
 378                 AddItem(tview.NewFlex().
 379                         SetDirection(tview.FlexRow).
 380                         AddItem(commandList, 4, 0, false).
 381                         AddItem(ui.chatBox, 0, 8, false).
 382                         AddItem(ui.chatInput, 3, 0, true), 0, 1, true).
 383                 AddItem(ui.userList, 25, 1, false)
 384         serverUI.SetBorder(true).SetTitle("| Mobius - Connected to " + "TODO" + " |").SetTitleAlign(tview.AlignLeft)
 385         serverUI.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
 386                 if event.Key() == tcell.KeyEscape {
 387                         ui.Pages.AddPage("modal", modal, false, true)
 388                 }
 389
 390                 // Show News
 391                 if event.Key() == tcell.KeyCtrlN {
 392                         if err := ui.HLClient.Send(*NewTransaction(tranGetMsgs, nil)); err != nil {
 393                                 ui.HLClient.Logger.Errorw("err", "err", err)
 394                         }
 395                 }
 396
 397                 // Post news
 398                 if event.Key() == tcell.KeyCtrlP {
 399
 400                         newsFlex := tview.NewFlex()
 401
 402                         newsPostTextArea := tview.NewTextView()
 403                         newsPostTextArea.SetBackgroundColor(tcell.ColorDimGray)
 404                         newsPostTextArea.SetChangedFunc(func() {
 405                                 ui.App.Draw() // TODO: docs say this is bad but it's the only way to show content during initial render??
 406                         })
 407                         //newsPostTextArea.SetBorderPadding(0, 0, 1, 1)
 408
 409                         newsPostForm := tview.NewForm().
 410                                 SetButtonsAlign(tview.AlignRight).
 411                                 AddButton("Post", nil)
 412                         newsPostForm.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
 413                                 switch event.Key() {
 414                                 case tcell.KeyTab:
 415                                         ui.App.SetFocus(newsPostTextArea)
 416                                 case tcell.KeyEnter:
 417                                         newsText := strings.ReplaceAll(newsPostTextArea.GetText(true), "\n", "\r")
 418                                         err := ui.HLClient.Send(
 419                                                 *NewTransaction(tranOldPostNews, nil,
 420                                                         NewField(fieldData, []byte(newsText)),
 421                                                 ),
 422                                         )
 423                                         if err != nil {
 424                                                 ui.HLClient.Logger.Errorw("Error posting news", "err", err)
 425                                                 // TODO: display errModal to user
 426                                         }
 427                                         //newsInput.SetText("") // clear the input field after chat send
 428                                         ui.Pages.RemovePage("newsInput")
 429                                 }
 430
 431                                 return event
 432                         })
 433
 434                         newsFlex.
 435                                 SetDirection(tview.FlexRow).
 436                                 SetBorder(true).
 437                                 SetTitle("News Post")
 438
 439                         newsPostTextArea.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
 440                                 ui.HLClient.Logger.Infow("key", "key", event.Key(), "rune", event.Rune())
 441                                 switch event.Key() {
 442                                 case tcell.KeyEscape:
 443                                         ui.Pages.RemovePage("newsInput")
 444                                 case tcell.KeyTab:
 445                                         ui.App.SetFocus(newsPostForm)
 446                                 case tcell.KeyEnter:
 447                                         fmt.Fprintf(newsPostTextArea, "\n")
 448                                 default:
 449                                         switch event.Rune() {
 450                                         case 127: // backspace
 451                                                 curTxt := newsPostTextArea.GetText(true)
 452                                                 if len(curTxt) > 0 {
 453                                                         curTxt = curTxt[:len(curTxt)-1]
 454                                                         newsPostTextArea.SetText(curTxt)
 455                                                 }
 456                                         default:
 457                                                 fmt.Fprintf(newsPostTextArea, string(event.Rune()))
 458                                         }
 459                                 }
 460
 461                                 return event
 462                         })
 463
 464                         newsFlex.AddItem(newsPostTextArea, 10, 0, true)
 465                         newsFlex.AddItem(newsPostForm, 3, 0, false)
 466
 467                         newsPostPage := tview.NewFlex().
 468                                 AddItem(nil, 0, 1, false).
 469                                 AddItem(tview.NewFlex().
 470                                         SetDirection(tview.FlexRow).
 471                                         AddItem(nil, 0, 1, false).
 472                                         AddItem(newsFlex, 15, 1, true).
 473                                         //AddItem(newsPostForm, 3, 0, false).
 474                                         AddItem(nil, 0, 1, false), 40, 1, false).
 475                                 AddItem(nil, 0, 1, false)
 476
 477                         ui.Pages.AddPage("newsInput", newsPostPage, true, true)
 478                         ui.App.SetFocus(newsPostTextArea)
 479                 }
 480
 481                 return event
 482         })
 483         return serverUI
 484 }
 485
 486 func (ui *UI) Start() {
 487         home := tview.NewFlex().SetDirection(tview.FlexRow)
 488         home.Box.SetBorder(true).SetTitle("| Mobius v" + VERSION + " |").SetTitleAlign(tview.AlignLeft)
 489         mainMenu := tview.NewList()
 490
 491         bannerItem := tview.NewTextView().
 492                 SetText(randomBanner()).
 493                 SetDynamicColors(true).
 494                 SetTextAlign(tview.AlignCenter)
 495
 496         home.AddItem(
 497                 tview.NewFlex().AddItem(bannerItem, 0, 1, false),
 498                 14, 1, false)
 499         home.AddItem(tview.NewFlex().
 500                 AddItem(nil, 0, 1, false).
 501                 AddItem(mainMenu, 0, 1, true).
 502                 AddItem(nil, 0, 1, false),
 503                 0, 1, true,
 504         )
 505
 506         mainMenu.AddItem("Join Server", "", 'j', func() {
 507                 joinServerPage := ui.renderJoinServerForm("", GuestAccount, "", "home", false, false)
 508                 ui.Pages.AddPage("joinServer", joinServerPage, true, true)
 509         }).
 510                 AddItem("Bookmarks", "", 'b', func() {
 511                         ui.Pages.AddAndSwitchToPage("bookmarks", ui.showBookmarks(), true)
 512                 }).
 513                 AddItem("Browse Tracker", "", 't', func() {
 514                         ui.trackerList = ui.getTrackerList()
 515                         ui.Pages.AddAndSwitchToPage("trackerList", ui.trackerList, true)
 516                 }).
 517                 AddItem("Settings", "", 's', func() {
 518                         ui.Pages.AddPage("settings", ui.renderSettingsForm(), true, true)
 519                 }).
 520                 AddItem("Quit", "", 'q', func() {
 521                         ui.App.Stop()
 522                 })
 523
 524         ui.Pages.AddPage("home", home, true, true)
 525
 526         // App level input capture
 527         ui.App.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
 528                 if event.Key() == tcell.KeyCtrlC {
 529                         ui.HLClient.Logger.Infow("Exiting")
 530                         ui.App.Stop()
 531                         os.Exit(0)
 532                 }
 533                 // Show Logs
 534                 if event.Key() == tcell.KeyCtrlL {
 535                         ui.HLClient.DebugBuf.TextView.ScrollToEnd()
 536                         ui.HLClient.DebugBuf.TextView.SetBorder(true).SetTitle("Logs")
 537                         ui.HLClient.DebugBuf.TextView.SetDoneFunc(func(key tcell.Key) {
 538                                 if key == tcell.KeyEscape {
 539                                         ui.Pages.RemovePage("logs")
 540                                 }
 541                         })
 542
 543                         ui.Pages.AddAndSwitchToPage("logs", ui.HLClient.DebugBuf.TextView, true)
 544                 }
 545                 return event
 546         })
 547
 548         if err := ui.App.SetRoot(ui.Pages, true).SetFocus(ui.Pages).Run(); err != nil {
 549                 ui.App.Stop()
 550                 os.Exit(1)
 551         }
 552 }
 553
 554 func NewClient(username string, logger *zap.SugaredLogger) *Client {
 555         c := &Client{
 556                 Logger:      logger,
 557                 activeTasks: make(map[uint32]*Transaction),
 558                 Handlers:    clientHandlers,
 559         }
 560         c.UI = NewUI(c)
 561
 562         prefs, err := readConfig(clientConfigPath)
 563         if err != nil {
 564                 return c
 565         }
 566         c.pref = prefs
 567
 568         return c
 569 }
 570
 571 type clientTransaction struct {
 572         Name    string
 573         Handler func(*Client, *Transaction) ([]Transaction, error)
 574 }
 575
 576 func (ch clientTransaction) Handle(cc *Client, t *Transaction) ([]Transaction, error) {
 577         return ch.Handler(cc, t)
 578 }
 579
 580 type clientTHandler interface {
 581         Handle(*Client, *Transaction) ([]Transaction, error)
 582 }
 583
 584 type mockClientHandler struct {
 585         mock.Mock
 586 }
 587
 588 func (mh *mockClientHandler) Handle(cc *Client, t *Transaction) ([]Transaction, error) {
 589         args := mh.Called(cc, t)
 590         return args.Get(0).([]Transaction), args.Error(1)
 591 }
 592
 593 var clientHandlers = map[uint16]clientTHandler{
 594         // Server initiated
 595         tranChatMsg: clientTransaction{
 596                 Name:    "tranChatMsg",
 597                 Handler: handleClientChatMsg,
 598         },
 599         tranLogin: clientTransaction{
 600                 Name:    "tranLogin",
 601                 Handler: handleClientTranLogin,
 602         },
 603         tranShowAgreement: clientTransaction{
 604                 Name:    "tranShowAgreement",
 605                 Handler: handleClientTranShowAgreement,
 606         },
 607         tranUserAccess: clientTransaction{
 608                 Name:    "tranUserAccess",
 609                 Handler: handleClientTranUserAccess,
 610         },
 611         tranGetUserNameList: clientTransaction{
 612                 Name:    "tranGetUserNameList",
 613                 Handler: handleClientGetUserNameList,
 614         },
 615         tranNotifyChangeUser: clientTransaction{
 616                 Name:    "tranNotifyChangeUser",
 617                 Handler: handleNotifyChangeUser,
 618         },
 619         tranNotifyDeleteUser: clientTransaction{
 620                 Name:    "tranNotifyDeleteUser",
 621                 Handler: handleNotifyDeleteUser,
 622         },
 623         tranGetMsgs: clientTransaction{
 624                 Name:    "tranNotifyDeleteUser",
 625                 Handler: handleGetMsgs,
 626         },
 627 }
 628
 629 func handleGetMsgs(c *Client, t *Transaction) (res []Transaction, err error) {
 630         newsText := string(t.GetField(fieldData).Data)
 631         newsText = strings.ReplaceAll(newsText, "\r", "\n")
 632
 633         newsTextView := tview.NewTextView().
 634                 SetText(newsText).
 635                 SetDoneFunc(func(key tcell.Key) {
 636                         c.UI.Pages.SwitchToPage("serverUI")
 637                         c.UI.App.SetFocus(c.UI.chatInput)
 638                 })
 639         newsTextView.SetBorder(true).SetTitle("News")
 640
 641         c.UI.Pages.AddPage("news", newsTextView, true, true)
 642         c.UI.Pages.SwitchToPage("news")
 643         c.UI.App.SetFocus(newsTextView)
 644
 645         c.UI.App.Draw()
 646
 647         return res, err
 648 }
 649
 650 func handleNotifyChangeUser(c *Client, t *Transaction) (res []Transaction, err error) {
 651         newUser := User{
 652                 ID:    t.GetField(fieldUserID).Data,
 653                 Name:  string(t.GetField(fieldUserName).Data),
 654                 Icon:  t.GetField(fieldUserIconID).Data,
 655                 Flags: t.GetField(fieldUserFlags).Data,
 656         }
 657
 658         // Possible cases:
 659         // user is new to the server
 660         // user is already on the server but has a new name
 661
 662         var oldName string
 663         var newUserList []User
 664         updatedUser := false
 665         for _, u := range c.UserList {
 666                 c.Logger.Debugw("Comparing Users", "userToUpdate", newUser.ID, "myID", u.ID, "userToUpdateName", newUser.Name, "myname", u.Name)
 667                 if bytes.Equal(newUser.ID, u.ID) {
 668                         oldName = u.Name
 669                         u.Name = newUser.Name
 670                         if u.Name != newUser.Name {
 671                                 _, _ = fmt.Fprintf(c.UI.chatBox, " <<< "+oldName+" is now known as "+newUser.Name+" >>>\n")
 672                         }
 673                         updatedUser = true
 674                 }
 675                 newUserList = append(newUserList, u)
 676         }
 677
 678         if !updatedUser {
 679                 newUserList = append(newUserList, newUser)
 680         }
 681
 682         c.UserList = newUserList
 683
 684         c.renderUserList()
 685
 686         return res, err
 687 }
 688
 689 func handleNotifyDeleteUser(c *Client, t *Transaction) (res []Transaction, err error) {
 690         exitUser := t.GetField(fieldUserID).Data
 691
 692         var newUserList []User
 693         for _, u := range c.UserList {
 694                 if !bytes.Equal(exitUser, u.ID) {
 695                         newUserList = append(newUserList, u)
 696                 }
 697         }
 698
 699         c.UserList = newUserList
 700
 701         c.renderUserList()
 702
 703         return res, err
 704 }
 705
 706 const readBuffSize = 1024000 // 1KB - TODO: what should this be?
 707
 708 func (c *Client) ReadLoop() error {
 709         tranBuff := make([]byte, 0)
 710         tReadlen := 0
 711         // Infinite loop where take action on incoming client requests until the connection is closed
 712         for {
 713                 buf := make([]byte, readBuffSize)
 714                 tranBuff = tranBuff[tReadlen:]
 715
 716                 readLen, err := c.Connection.Read(buf)
 717                 if err != nil {
 718                         return err
 719                 }
 720                 tranBuff = append(tranBuff, buf[:readLen]...)
 721
 722                 // We may have read multiple requests worth of bytes from Connection.Read.  readTransactions splits them
 723                 // into a slice of transactions
 724                 var transactions []Transaction
 725                 if transactions, tReadlen, err = readTransactions(tranBuff); err != nil {
 726                         c.Logger.Errorw("Error handling transaction", "err", err)
 727                 }
 728
 729                 // iterate over all of the transactions that were parsed from the byte slice and handle them
 730                 for _, t := range transactions {
 731                         if err := c.HandleTransaction(&t); err != nil {
 732                                 c.Logger.Errorw("Error handling transaction", "err", err)
 733                         }
 734                 }
 735         }
 736 }
 737
 738 func (c *Client) GetTransactions() error {
 739         tranBuff := make([]byte, 0)
 740         tReadlen := 0
 741
 742         buf := make([]byte, readBuffSize)
 743         tranBuff = tranBuff[tReadlen:]
 744
 745         readLen, err := c.Connection.Read(buf)
 746         if err != nil {
 747                 return err
 748         }
 749         tranBuff = append(tranBuff, buf[:readLen]...)
 750
 751         return nil
 752 }
 753
 754 func handleClientGetUserNameList(c *Client, t *Transaction) (res []Transaction, err error) {
 755         var users []User
 756         for _, field := range t.Fields {
 757                 // The Hotline protocol docs say that ClientGetUserNameList should only return fieldUsernameWithInfo (300)
 758                 // fields, but shxd sneaks in fieldChatSubject (115) so it's important to filter explicitly for the expected
 759                 // field type.  Probably a good idea to do everywhere.
 760                 if bytes.Equal(field.ID, []byte{0x01, 0x2c}) {
 761                         u, err := ReadUser(field.Data)
 762                         if err != nil {
 763                                 return res, err
 764                         }
 765                         users = append(users, *u)
 766                 }
 767         }
 768         c.UserList = users
 769
 770         c.renderUserList()
 771
 772         return res, err
 773 }
 774
 775 func (c *Client) renderUserList() {
 776         c.UI.userList.Clear()
 777         for _, u := range c.UserList {
 778                 flagBitmap := big.NewInt(int64(binary.BigEndian.Uint16(u.Flags)))
 779                 if flagBitmap.Bit(userFlagAdmin) == 1 {
 780                         _, _ = fmt.Fprintf(c.UI.userList, "[red::b]%s[-:-:-]\n", u.Name)
 781                 } else {
 782                         _, _ = fmt.Fprintf(c.UI.userList, "%s\n", u.Name)
 783                 }
 784         }
 785 }
 786
 787 func handleClientChatMsg(c *Client, t *Transaction) (res []Transaction, err error) {
 788         _, _ = fmt.Fprintf(c.UI.chatBox, "%s \n", t.GetField(fieldData).Data)
 789
 790         return res, err
 791 }
 792
 793 func handleClientTranUserAccess(c *Client, t *Transaction) (res []Transaction, err error) {
 794         c.UserAccess = t.GetField(fieldUserAccess).Data
 795
 796         return res, err
 797 }
 798
 799 func handleClientTranShowAgreement(c *Client, t *Transaction) (res []Transaction, err error) {
 800         agreement := string(t.GetField(fieldData).Data)
 801         agreement = strings.ReplaceAll(agreement, "\r", "\n")
 802
 803         c.UI.agreeModal = tview.NewModal().
 804                 SetText(agreement).
 805                 AddButtons([]string{"Agree", "Disagree"}).
 806                 SetDoneFunc(func(buttonIndex int, buttonLabel string) {
 807                         if buttonIndex == 0 {
 808                                 res = append(res,
 809                                         *NewTransaction(
 810                                                 tranAgreed, nil,
 811                                                 NewField(fieldUserName, []byte(c.pref.Username)),
 812                                                 NewField(fieldUserIconID, c.pref.IconBytes()),
 813                                                 NewField(fieldUserFlags, []byte{0x00, 0x00}),
 814                                                 NewField(fieldOptions, []byte{0x00, 0x00}),
 815                                         ),
 816                                 )
 817                                 c.Agreed = true
 818                                 c.UI.Pages.HidePage("agreement")
 819                                 c.UI.App.SetFocus(c.UI.chatInput)
 820                         } else {
 821                                 _ = c.Disconnect()
 822                                 c.UI.Pages.SwitchToPage("home")
 823                         }
 824                 },
 825                 )
 826
 827         c.Logger.Debug("show agreement page")
 828         c.UI.Pages.AddPage("agreement", c.UI.agreeModal, false, true)
 829
 830         c.UI.Pages.ShowPage("agreement ")
 831
 832         c.UI.App.Draw()
 833         return res, err
 834 }
 835
 836 func handleClientTranLogin(c *Client, t *Transaction) (res []Transaction, err error) {
 837         if !bytes.Equal(t.ErrorCode, []byte{0, 0, 0, 0}) {
 838                 errMsg := string(t.GetField(fieldError).Data)
 839                 errModal := tview.NewModal()
 840                 errModal.SetText(errMsg)
 841                 errModal.AddButtons([]string{"Oh no"})
 842                 errModal.SetDoneFunc(func(buttonIndex int, buttonLabel string) {
 843                         c.UI.Pages.RemovePage("errModal")
 844                 })
 845                 c.UI.Pages.RemovePage("joinServer")
 846                 c.UI.Pages.AddPage("errModal", errModal, false, true)
 847
 848                 c.UI.App.Draw() // TODO: errModal doesn't render without this.  wtf?
 849
 850                 c.Logger.Error(string(t.GetField(fieldError).Data))
 851                 return nil, errors.New("login error: " + string(t.GetField(fieldError).Data))
 852         }
 853         c.UI.Pages.AddAndSwitchToPage("serverUI", c.UI.renderServerUI(), true)
 854         c.UI.App.SetFocus(c.UI.chatInput)
 855
 856         if err := c.Send(*NewTransaction(tranGetUserNameList, nil)); err != nil {
 857                 c.Logger.Errorw("err", "err", err)
 858         }
 859         return res, err
 860 }
 861
 862 // JoinServer connects to a Hotline server and completes the login flow
 863 func (c *Client) JoinServer(address, login, passwd string) error {
 864         // Establish TCP connection to server
 865         if err := c.connect(address); err != nil {
 866                 return err
 867         }
 868
 869         // Send handshake sequence
 870         if err := c.Handshake(); err != nil {
 871                 return err
 872         }
 873
 874         // Authenticate (send tranLogin 107)
 875         if err := c.LogIn(login, passwd); err != nil {
 876                 return err
 877         }
 878
 879         return nil
 880 }
 881
 882 // connect establishes a connection with a Server by sending handshake sequence
 883 func (c *Client) connect(address string) error {
 884         var err error
 885         c.Connection, err = net.DialTimeout("tcp", address, 5*time.Second)
 886         if err != nil {
 887                 return err
 888         }
 889         return nil
 890 }
 891
 892 var ClientHandshake = []byte{
 893         0x54, 0x52, 0x54, 0x50, // TRTP
 894         0x48, 0x4f, 0x54, 0x4c, // HOTL
 895         0x00, 0x01,
 896         0x00, 0x02,
 897 }
 898
 899 var ServerHandshake = []byte{
 900         0x54, 0x52, 0x54, 0x50, // TRTP
 901         0x00, 0x00, 0x00, 0x00, // ErrorCode
 902 }
 903
 904 func (c *Client) Handshake() error {
 905         //Protocol ID   4       ‘TRTP’      0x54 52 54 50
 906         //Sub-protocol ID       4               User defined
 907         //Version       2       1       Currently 1
 908         //Sub-version   2               User defined
 909         if _, err := c.Connection.Write(ClientHandshake); err != nil {
 910                 return fmt.Errorf("handshake write err: %s", err)
 911         }
 912
 913         replyBuf := make([]byte, 8)
 914         _, err := c.Connection.Read(replyBuf)
 915         if err != nil {
 916                 return err
 917         }
 918
 919         //spew.Dump(replyBuf)
 920         if bytes.Compare(replyBuf, ServerHandshake) == 0 {
 921                 return nil
 922         }
 923         // In the case of an error, client and server close the connection.
 924
 925         return fmt.Errorf("handshake response err: %s", err)
 926 }
 927
 928 func (c *Client) LogIn(login string, password string) error {
 929         return c.Send(
 930                 *NewTransaction(
 931                         tranLogin, nil,
 932                         NewField(fieldUserName, []byte(c.pref.Username)),
 933                         NewField(fieldUserIconID, c.pref.IconBytes()),
 934                         NewField(fieldUserLogin, []byte(NegatedUserString([]byte(login)))),
 935                         NewField(fieldUserPassword, []byte(NegatedUserString([]byte(password)))),
 936                         NewField(fieldVersion, []byte{0, 2}),
 937                 ),
 938         )
 939 }
 940
 941 func (c *Client) Send(t Transaction) error {
 942         requestNum := binary.BigEndian.Uint16(t.Type)
 943         tID := binary.BigEndian.Uint32(t.ID)
 944
 945         //handler := TransactionHandlers[requestNum]
 946
 947         // if transaction is NOT reply, add it to the list to transactions we're expecting a response for
 948         if t.IsReply == 0 {
 949                 c.activeTasks[tID] = &t
 950         }
 951
 952         var n int
 953         var err error
 954         if n, err = c.Connection.Write(t.Payload()); err != nil {
 955                 return err
 956         }
 957         c.Logger.Debugw("Sent Transaction",
 958                 "IsReply", t.IsReply,
 959                 "type", requestNum,
 960                 "sentBytes", n,
 961         )
 962         return nil
 963 }
 964
 965 func (c *Client) HandleTransaction(t *Transaction) error {
 966         var origT Transaction
 967         if t.IsReply == 1 {
 968                 requestID := binary.BigEndian.Uint32(t.ID)
 969                 origT = *c.activeTasks[requestID]
 970                 t.Type = origT.Type
 971         }
 972
 973         requestNum := binary.BigEndian.Uint16(t.Type)
 974         c.Logger.Infow(
 975                 "Received Transaction",
 976                 "RequestType", requestNum,
 977         )
 978
 979         if handler, ok := c.Handlers[requestNum]; ok {
 980                 outT, _ := handler.Handle(c, t)
 981                 for _, t := range outT {
 982                         c.Send(t)
 983                 }
 984         } else {
 985                 c.Logger.Errorw(
 986                         "Unimplemented transaction type received",
 987                         "RequestID", requestNum,
 988                         "TransactionID", t.ID,
 989                 )
 990         }
 991
 992         return nil
 993 }
 994
 995 func (c *Client) Connected() bool {
 996         fmt.Printf("Agreed: %v UserAccess: %v\n", c.Agreed, c.UserAccess)
 997         // c.Agreed == true &&
 998         if c.UserAccess != nil {
 999                 return true
1000         }
1001         return false
1002 }
1003
1004 func (c *Client) Disconnect() error {
1005         err := c.Connection.Close()
1006         if err != nil {
1007                 return err
1008         }
1009         return nil
1010 }