git.r.bdr.sh - rbdr/mobius/blob - hotline/transaction_handlers.go

   1 package hotline
   2
   3 import (
   4         "bytes"
   5         "encoding/binary"
   6         "errors"
   7         "fmt"
   8         "github.com/davecgh/go-spew/spew"
   9         "gopkg.in/yaml.v2"
  10         "io/ioutil"
  11         "math/big"
  12         "os"
  13         "sort"
  14         "strings"
  15         "time"
  16 )
  17
  18 type TransactionType struct {
  19         Access         int                                                    // Specifies access privilege required to perform the transaction
  20         DenyMsg        string                                                 // The error reply message when user does not have access
  21         Handler        func(*ClientConn, *Transaction) ([]Transaction, error) // function for handling the transaction type
  22         Name           string                                                 // Name of transaction as it will appear in logging
  23         RequiredFields []requiredField
  24 }
  25
  26 var TransactionHandlers = map[uint16]TransactionType{
  27         // Server initiated
  28         tranChatMsg: {
  29                 Name: "tranChatMsg",
  30         },
  31         // Server initiated
  32         tranNotifyChangeUser: {
  33                 Name: "tranNotifyChangeUser",
  34         },
  35         tranError: {
  36                 Name: "tranError",
  37         },
  38         tranShowAgreement: {
  39                 Name: "tranShowAgreement",
  40         },
  41         tranUserAccess: {
  42                 Name: "tranUserAccess",
  43         },
  44         tranNotifyDeleteUser: {
  45                 Name: "tranNotifyDeleteUser",
  46         },
  47         tranAgreed: {
  48                 Access:  accessAlwaysAllow,
  49                 Name:    "tranAgreed",
  50                 Handler: HandleTranAgreed,
  51         },
  52         tranChatSend: {
  53                 Access:  accessSendChat,
  54                 DenyMsg: "You are not allowed to participate in chat.",
  55                 Handler: HandleChatSend,
  56                 Name:    "tranChatSend",
  57                 RequiredFields: []requiredField{
  58                         {
  59                                 ID:     fieldData,
  60                                 minLen: 0,
  61                         },
  62                 },
  63         },
  64         tranDelNewsArt: {
  65                 Access:  accessNewsDeleteArt,
  66                 DenyMsg: "You are not allowed to delete news articles.",
  67                 Name:    "tranDelNewsArt",
  68                 Handler: HandleDelNewsArt,
  69         },
  70         tranDelNewsItem: {
  71                 Access: accessAlwaysAllow, // Granular access enforced inside the handler
  72                 // Has multiple access flags: News Delete Folder (37) or News Delete Category (35)
  73                 // TODO: Implement inside the handler
  74                 Name:    "tranDelNewsItem",
  75                 Handler: HandleDelNewsItem,
  76         },
  77         tranDeleteFile: {
  78                 Access:  accessAlwaysAllow, // Granular access enforced inside the handler
  79                 Name:    "tranDeleteFile",
  80                 Handler: HandleDeleteFile,
  81         },
  82         tranDeleteUser: {
  83                 Access:  accessDeleteUser,
  84                 DenyMsg: "You are not allowed to delete accounts.",
  85                 Name:    "tranDeleteUser",
  86                 Handler: HandleDeleteUser,
  87         },
  88         tranDisconnectUser: {
  89                 Access:  accessDisconUser,
  90                 DenyMsg: "You are not allowed to disconnect users.",
  91                 Name:    "tranDisconnectUser",
  92                 Handler: HandleDisconnectUser,
  93         },
  94         tranDownloadFile: {
  95                 Access:  accessDownloadFile,
  96                 DenyMsg: "You are not allowed to download files.",
  97                 Name:    "tranDownloadFile",
  98                 Handler: HandleDownloadFile,
  99         },
 100         tranDownloadFldr: {
 101                 Access:  accessDownloadFile, // There is no specific access flag for folder vs file download
 102                 DenyMsg: "You are not allowed to download files.",
 103                 Name:    "tranDownloadFldr",
 104                 Handler: HandleDownloadFolder,
 105         },
 106         tranGetClientInfoText: {
 107                 Access:  accessGetClientInfo,
 108                 DenyMsg: "You are not allowed to get client info",
 109                 Name:    "tranGetClientInfoText",
 110                 Handler: HandleGetClientConnInfoText,
 111         },
 112         tranGetFileInfo: {
 113                 Access:  accessAlwaysAllow,
 114                 Name:    "tranGetFileInfo",
 115                 Handler: HandleGetFileInfo,
 116         },
 117         tranGetFileNameList: {
 118                 Access:  accessAlwaysAllow,
 119                 Name:    "tranGetFileNameList",
 120                 Handler: HandleGetFileNameList,
 121         },
 122         tranGetMsgs: {
 123                 Access:  accessNewsReadArt,
 124                 DenyMsg: "You are not allowed to read news.",
 125                 Name:    "tranGetMsgs",
 126                 Handler: HandleGetMsgs,
 127         },
 128         tranGetNewsArtData: {
 129                 Access:  accessNewsReadArt,
 130                 DenyMsg: "You are not allowed to read news.",
 131                 Name:    "tranGetNewsArtData",
 132                 Handler: HandleGetNewsArtData,
 133         },
 134         tranGetNewsArtNameList: {
 135                 Access:  accessNewsReadArt,
 136                 DenyMsg: "You are not allowed to read news.",
 137                 Name:    "tranGetNewsArtNameList",
 138                 Handler: HandleGetNewsArtNameList,
 139         },
 140         tranGetNewsCatNameList: {
 141                 Access:  accessNewsReadArt,
 142                 DenyMsg: "You are not allowed to read news.",
 143                 Name:    "tranGetNewsCatNameList",
 144                 Handler: HandleGetNewsCatNameList,
 145         },
 146         tranGetUser: {
 147                 Access:  accessOpenUser,
 148                 DenyMsg: "You are not allowed to view accounts.",
 149                 Name:    "tranGetUser",
 150                 Handler: HandleGetUser,
 151         },
 152         tranGetUserNameList: {
 153                 Access:  accessAlwaysAllow,
 154                 Name:    "tranHandleGetUserNameList",
 155                 Handler: HandleGetUserNameList,
 156         },
 157         tranInviteNewChat: {
 158                 Access:  accessOpenChat,
 159                 DenyMsg: "You are not allowed to request private chat.",
 160                 Name:    "tranInviteNewChat",
 161                 Handler: HandleInviteNewChat,
 162         },
 163         tranInviteToChat: {
 164                 Access:  accessOpenChat,
 165                 DenyMsg: "You are not allowed to request private chat.",
 166                 Name:    "tranInviteToChat",
 167                 Handler: HandleInviteToChat,
 168         },
 169         tranJoinChat: {
 170                 Access:  accessAlwaysAllow,
 171                 Name:    "tranJoinChat",
 172                 Handler: HandleJoinChat,
 173         },
 174         tranKeepAlive: {
 175                 Access:  accessAlwaysAllow,
 176                 Name:    "tranKeepAlive",
 177                 Handler: HandleKeepAlive,
 178         },
 179         tranLeaveChat: {
 180                 Access:  accessAlwaysAllow,
 181                 Name:    "tranJoinChat",
 182                 Handler: HandleLeaveChat,
 183         },
 184
 185         tranListUsers: {
 186                 Access:  accessOpenUser,
 187                 DenyMsg: "You are not allowed to view accounts.",
 188                 Name:    "tranListUsers",
 189                 Handler: HandleListUsers,
 190         },
 191         tranMoveFile: {
 192                 Access:  accessMoveFile,
 193                 DenyMsg: "You are not allowed to move files.",
 194                 Name:    "tranMoveFile",
 195                 Handler: HandleMoveFile,
 196         },
 197         tranNewFolder: {
 198                 Access:  accessCreateFolder,
 199                 DenyMsg: "You are not allow to create folders.",
 200                 Name:    "tranNewFolder",
 201                 Handler: HandleNewFolder,
 202         },
 203         tranNewNewsCat: {
 204                 Access:  accessNewsCreateCat,
 205                 DenyMsg: "You are not allowed to create news categories.",
 206                 Name:    "tranNewNewsCat",
 207                 Handler: HandleNewNewsCat,
 208         },
 209         tranNewNewsFldr: {
 210                 Access:  accessNewsCreateFldr,
 211                 DenyMsg: "You are not allowed to create news folders.",
 212                 Name:    "tranNewNewsFldr",
 213                 Handler: HandleNewNewsFldr,
 214         },
 215         tranNewUser: {
 216                 Access:  accessCreateUser,
 217                 DenyMsg: "You are not allowed to create new accounts.",
 218                 Name:    "tranNewUser",
 219                 Handler: HandleNewUser,
 220         },
 221         tranOldPostNews: {
 222                 Access:  accessNewsPostArt,
 223                 DenyMsg: "You are not allowed to post news.",
 224                 Name:    "tranOldPostNews",
 225                 Handler: HandleTranOldPostNews,
 226         },
 227         tranPostNewsArt: {
 228                 Access:  accessNewsPostArt,
 229                 DenyMsg: "You are not allowed to post news articles.",
 230                 Name:    "tranPostNewsArt",
 231                 Handler: HandlePostNewsArt,
 232         },
 233         tranRejectChatInvite: {
 234                 Access:  accessAlwaysAllow,
 235                 Name:    "tranRejectChatInvite",
 236                 Handler: HandleRejectChatInvite,
 237         },
 238         tranSendInstantMsg: {
 239                 Access: accessAlwaysAllow,
 240                 //Access: accessSendPrivMsg,
 241                 //DenyMsg: "You are not allowed to send private messages",
 242                 Name:    "tranSendInstantMsg",
 243                 Handler: HandleSendInstantMsg,
 244                 RequiredFields: []requiredField{
 245                         {
 246                                 ID:     fieldData,
 247                                 minLen: 0,
 248                         },
 249                         {
 250                                 ID: fieldUserID,
 251                         },
 252                 },
 253         },
 254         tranSetChatSubject: {
 255                 Access:  accessAlwaysAllow,
 256                 Name:    "tranSetChatSubject",
 257                 Handler: HandleSetChatSubject,
 258         },
 259         tranSetClientUserInfo: {
 260                 Access:  accessAlwaysAllow,
 261                 Name:    "tranSetClientUserInfo",
 262                 Handler: HandleSetClientUserInfo,
 263         },
 264         tranSetFileInfo: {
 265                 Access:  accessAlwaysAllow, // granular access is in the handler
 266                 Name:    "tranSetFileInfo",
 267                 Handler: HandleSetFileInfo,
 268         },
 269         tranSetUser: {
 270                 Access:  accessModifyUser,
 271                 DenyMsg: "You are not allowed to modify accounts.",
 272                 Name:    "tranSetUser",
 273                 Handler: HandleSetUser,
 274         },
 275         tranUploadFile: {
 276                 Access:  accessUploadFile,
 277                 DenyMsg: "You are not allowed to upload files.",
 278                 Name:    "tranUploadFile",
 279                 Handler: HandleUploadFile,
 280         },
 281         tranUploadFldr: {
 282                 Access:  accessAlwaysAllow, // TODO: what should this be?
 283                 Name:    "tranUploadFldr",
 284                 Handler: HandleUploadFolder,
 285         },
 286         tranUserBroadcast: {
 287                 Access:  accessBroadcast,
 288                 DenyMsg: "You are not allowed to send broadcast messages.",
 289                 Name:    "tranUserBroadcast",
 290                 Handler: HandleUserBroadcast,
 291         },
 292 }
 293
 294 func HandleChatSend(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 295         // Truncate long usernames
 296         trunc := fmt.Sprintf("%13s", *cc.UserName)
 297         formattedMsg := fmt.Sprintf("\r%.14s:  %s", trunc, t.GetField(fieldData).Data)
 298
 299         // By holding the option key, Hotline chat allows users to send /me formatted messages like:
 300         // *** Halcyon does stuff
 301         // This is indicated by the presence of the optional field fieldChatOptions in the transaction payload
 302         if t.GetField(fieldChatOptions).Data != nil {
 303                 formattedMsg = fmt.Sprintf("\r*** %s %s", *cc.UserName, t.GetField(fieldData).Data)
 304         }
 305
 306         if bytes.Equal(t.GetField(fieldData).Data, []byte("/stats")) {
 307                 formattedMsg = strings.Replace(cc.Server.Stats.String(), "\n", "\r", -1)
 308         }
 309
 310         chatID := t.GetField(fieldChatID).Data
 311         // a non-nil chatID indicates the message belongs to a private chat
 312         if chatID != nil {
 313                 chatInt := binary.BigEndian.Uint32(chatID)
 314                 privChat := cc.Server.PrivateChats[chatInt]
 315
 316                 // send the message to all connected clients of the private chat
 317                 for _, c := range privChat.ClientConn {
 318                         res = append(res, *NewTransaction(
 319                                 tranChatMsg,
 320                                 c.ID,
 321                                 NewField(fieldChatID, chatID),
 322                                 NewField(fieldData, []byte(formattedMsg)),
 323                         ))
 324                 }
 325                 return res, err
 326         }
 327
 328         for _, c := range sortedClients(cc.Server.Clients) {
 329                 // Filter out clients that do not have the read chat permission
 330                 if authorize(c.Account.Access, accessReadChat) {
 331                         res = append(res, *NewTransaction(tranChatMsg, c.ID, NewField(fieldData, []byte(formattedMsg))))
 332                 }
 333         }
 334
 335         return res, err
 336 }
 337
 338 // HandleSendInstantMsg sends instant message to the user on the current server.
 339 // Fields used in the request:
 340 //      103     User ID
 341 //      113     Options
 342 //              One of the following values:
 343 //              - User message (myOpt_UserMessage = 1)
 344 //              - Refuse message (myOpt_RefuseMessage = 2)
 345 //              - Refuse chat (myOpt_RefuseChat  = 3)
 346 //              - Automatic response (myOpt_AutomaticResponse = 4)"
 347 //      101     Data    Optional
 348 //      214     Quoting message Optional
 349 //
 350 //Fields used in the reply:
 351 // None
 352 func HandleSendInstantMsg(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 353         msg := t.GetField(fieldData)
 354         ID := t.GetField(fieldUserID)
 355         // TODO: Implement reply quoting
 356         //options := transaction.GetField(hotline.fieldOptions)
 357
 358         res = append(res,
 359                 *NewTransaction(
 360                         tranServerMsg,
 361                         &ID.Data,
 362                         NewField(fieldData, msg.Data),
 363                         NewField(fieldUserName, *cc.UserName),
 364                         NewField(fieldUserID, *cc.ID),
 365                         NewField(fieldOptions, []byte{0, 1}),
 366                 ),
 367         )
 368         id, _ := byteToInt(ID.Data)
 369
 370         //keys := make([]uint16, 0, len(cc.Server.Clients))
 371         //for k := range cc.Server.Clients {
 372         //      keys = append(keys, k)
 373         //}
 374
 375         otherClient := cc.Server.Clients[uint16(id)]
 376         if otherClient == nil {
 377                 return res, errors.New("ohno")
 378         }
 379
 380         // Respond with auto reply if other client has it enabled
 381         if len(*otherClient.AutoReply) > 0 {
 382                 res = append(res,
 383                         *NewTransaction(
 384                                 tranServerMsg,
 385                                 cc.ID,
 386                                 NewField(fieldData, *otherClient.AutoReply),
 387                                 NewField(fieldUserName, *otherClient.UserName),
 388                                 NewField(fieldUserID, *otherClient.ID),
 389                                 NewField(fieldOptions, []byte{0, 1}),
 390                         ),
 391                 )
 392         }
 393
 394         res = append(res, cc.NewReply(t))
 395
 396         return res, err
 397 }
 398
 399 func HandleGetFileInfo(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 400         fileName := string(t.GetField(fieldFileName).Data)
 401         filePath := cc.Server.Config.FileRoot + ReadFilePath(t.GetField(fieldFilePath).Data)
 402         spew.Dump(cc.Server.Config.FileRoot)
 403
 404         ffo, err := NewFlattenedFileObject(filePath, fileName)
 405         if err != nil {
 406                 return res, err
 407         }
 408
 409         res = append(res, cc.NewReply(t,
 410                 NewField(fieldFileName, []byte(fileName)),
 411                 NewField(fieldFileTypeString, ffo.FlatFileInformationFork.TypeSignature),
 412                 NewField(fieldFileCreatorString, ffo.FlatFileInformationFork.CreatorSignature),
 413                 NewField(fieldFileComment, ffo.FlatFileInformationFork.Comment),
 414                 NewField(fieldFileType, ffo.FlatFileInformationFork.TypeSignature),
 415                 NewField(fieldFileCreateDate, ffo.FlatFileInformationFork.CreateDate),
 416                 NewField(fieldFileModifyDate, ffo.FlatFileInformationFork.ModifyDate),
 417                 NewField(fieldFileSize, ffo.FlatFileDataForkHeader.DataSize),
 418         ))
 419         return res, err
 420 }
 421
 422 // HandleSetFileInfo updates a file or folder name and/or comment from the Get Info window
 423 // TODO: Implement support for comments
 424 // Fields used in the request:
 425 // * 201        File name
 426 // * 202        File path       Optional
 427 // * 211        File new name   Optional
 428 // * 210        File comment    Optional
 429 // Fields used in the reply:    None
 430 func HandleSetFileInfo(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 431         fileName := string(t.GetField(fieldFileName).Data)
 432         filePath := cc.Server.Config.FileRoot + ReadFilePath(t.GetField(fieldFilePath).Data)
 433         //fileComment := t.GetField(fieldFileComment).Data
 434         fileNewName := t.GetField(fieldFileNewName).Data
 435
 436         if fileNewName != nil {
 437                 path := filePath + "/" + fileName
 438                 fi, err := os.Stat(path)
 439                 if err != nil {
 440                         return res, err
 441                 }
 442                 switch mode := fi.Mode(); {
 443                 case mode.IsDir():
 444                         if !authorize(cc.Account.Access, accessRenameFolder) {
 445                                 res = append(res, cc.NewErrReply(t, "You are not allowed to rename folders."))
 446                                 return res, err
 447                         }
 448                 case mode.IsRegular():
 449                         if !authorize(cc.Account.Access, accessRenameFile) {
 450                                 res = append(res, cc.NewErrReply(t, "You are not allowed to rename files."))
 451                                 return res, err
 452                         }
 453                 }
 454
 455                 err = os.Rename(filePath+"/"+fileName, filePath+"/"+string(fileNewName))
 456                 if os.IsNotExist(err) {
 457                         res = append(res, cc.NewErrReply(t, "Cannot rename file "+fileName+" because it does not exist or cannot be found."))
 458                         return res, err
 459                 }
 460         }
 461
 462         res = append(res, cc.NewReply(t))
 463         return res, err
 464 }
 465
 466 // HandleDeleteFile deletes a file or folder
 467 // Fields used in the request:
 468 // * 201        File name
 469 // * 202        File path
 470 // Fields used in the reply: none
 471 func HandleDeleteFile(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 472         fileName := string(t.GetField(fieldFileName).Data)
 473         filePath := cc.Server.Config.FileRoot + ReadFilePath(t.GetField(fieldFilePath).Data)
 474
 475         path := "./" + filePath + "/" + fileName
 476
 477         cc.Server.Logger.Debugw("Delete file", "src", filePath+"/"+fileName)
 478
 479         fi, err := os.Stat(path)
 480         if err != nil {
 481                 res = append(res, cc.NewErrReply(t, "Cannot delete file "+fileName+" because it does not exist or cannot be found."))
 482                 return res, nil
 483         }
 484         switch mode := fi.Mode(); {
 485         case mode.IsDir():
 486                 if !authorize(cc.Account.Access, accessDeleteFolder) {
 487                         res = append(res, cc.NewErrReply(t, "You are not allowed to delete folders."))
 488                         return res, err
 489                 }
 490         case mode.IsRegular():
 491                 if !authorize(cc.Account.Access, accessDeleteFile) {
 492                         res = append(res, cc.NewErrReply(t, "You are not allowed to delete files."))
 493                         return res, err
 494                 }
 495         }
 496
 497         if err := os.RemoveAll(path); err != nil {
 498                 return res, err
 499         }
 500
 501         res = append(res, cc.NewReply(t))
 502         return res, err
 503 }
 504
 505 // HandleMoveFile moves files or folders. Note: seemingly not documented
 506 func HandleMoveFile(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 507         fileName := string(t.GetField(fieldFileName).Data)
 508         filePath := "./" + cc.Server.Config.FileRoot + ReadFilePath(t.GetField(fieldFilePath).Data)
 509         fileNewPath := "./" + cc.Server.Config.FileRoot + ReadFilePath(t.GetField(fieldFileNewPath).Data)
 510
 511         cc.Server.Logger.Debugw("Move file", "src", filePath+"/"+fileName, "dst", fileNewPath+"/"+fileName)
 512
 513         path := filePath + "/" + fileName
 514         fi, err := os.Stat(path)
 515         if err != nil {
 516                 return res, err
 517         }
 518         switch mode := fi.Mode(); {
 519         case mode.IsDir():
 520                 if !authorize(cc.Account.Access, accessMoveFolder) {
 521                         res = append(res, cc.NewErrReply(t, "You are not allowed to move folders."))
 522                         return res, err
 523                 }
 524         case mode.IsRegular():
 525                 if !authorize(cc.Account.Access, accessMoveFile) {
 526                         res = append(res, cc.NewErrReply(t, "You are not allowed to move files."))
 527                         return res, err
 528                 }
 529         }
 530
 531         err = os.Rename(filePath+"/"+fileName, fileNewPath+"/"+fileName)
 532         if os.IsNotExist(err) {
 533                 res = append(res, cc.NewErrReply(t, "Cannot delete file "+fileName+" because it does not exist or cannot be found."))
 534                 return res, err
 535         }
 536         if err != nil {
 537                 return []Transaction{}, err
 538         }
 539         // TODO: handle other possible errors; e.g. file delete fails due to file permission issue
 540
 541         res = append(res, cc.NewReply(t))
 542         return res, err
 543 }
 544
 545 func HandleNewFolder(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 546         newFolderPath := cc.Server.Config.FileRoot
 547
 548         // fieldFilePath is only present for nested paths
 549         if t.GetField(fieldFilePath).Data != nil {
 550                 newFp := NewFilePath(t.GetField(fieldFilePath).Data)
 551                 newFolderPath += newFp.String()
 552         }
 553         newFolderPath += "/" + string(t.GetField(fieldFileName).Data)
 554
 555         if err := os.Mkdir(newFolderPath, 0777); err != nil {
 556                 // TODO: Send error response to client
 557                 return []Transaction{}, err
 558         }
 559
 560         res = append(res, cc.NewReply(t))
 561         return res, err
 562 }
 563
 564 func HandleSetUser(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 565         login := DecodeUserString(t.GetField(fieldUserLogin).Data)
 566         userName := string(t.GetField(fieldUserName).Data)
 567
 568         newAccessLvl := t.GetField(fieldUserAccess).Data
 569
 570         account := cc.Server.Accounts[login]
 571         account.Access = &newAccessLvl
 572         account.Name = userName
 573
 574         // If the password field is cleared in the Hotline edit user UI, the SetUser transaction does
 575         // not include fieldUserPassword
 576         if t.GetField(fieldUserPassword).Data == nil {
 577                 account.Password = hashAndSalt([]byte(""))
 578         }
 579         if len(t.GetField(fieldUserPassword).Data) > 1 {
 580                 account.Password = hashAndSalt(t.GetField(fieldUserPassword).Data)
 581         }
 582
 583         file := cc.Server.ConfigDir + "Users/" + login + ".yaml"
 584         out, err := yaml.Marshal(&account)
 585         if err != nil {
 586                 return res, err
 587         }
 588         if err := ioutil.WriteFile(file, out, 0666); err != nil {
 589                 return res, err
 590         }
 591
 592         // Notify connected clients logged in as the user of the new access level
 593         for _, c := range cc.Server.Clients {
 594                 if c.Account.Login == login {
 595                         // Note: comment out these two lines to test server-side deny messages
 596                         newT := NewTransaction(tranUserAccess, c.ID, NewField(fieldUserAccess, newAccessLvl))
 597                         res = append(res, *newT)
 598
 599                         flagBitmap := big.NewInt(int64(binary.BigEndian.Uint16(*c.Flags)))
 600                         if authorize(c.Account.Access, accessDisconUser) {
 601                                 flagBitmap.SetBit(flagBitmap, userFlagAdmin, 1)
 602                         } else {
 603                                 flagBitmap.SetBit(flagBitmap, userFlagAdmin, 0)
 604                         }
 605                         binary.BigEndian.PutUint16(*c.Flags, uint16(flagBitmap.Int64()))
 606
 607                         c.Account.Access = account.Access
 608
 609                         cc.sendAll(
 610                                 tranNotifyChangeUser,
 611                                 NewField(fieldUserID, *c.ID),
 612                                 NewField(fieldUserFlags, *c.Flags),
 613                                 NewField(fieldUserName, *c.UserName),
 614                                 NewField(fieldUserIconID, *c.Icon),
 615                         )
 616                 }
 617         }
 618
 619         // TODO: If we have just promoted a connected user to admin, notify
 620         // connected clients to turn the user red
 621
 622         res = append(res, cc.NewReply(t))
 623         return res, err
 624 }
 625
 626 func HandleGetUser(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 627         userLogin := string(t.GetField(fieldUserLogin).Data)
 628         account := cc.Server.Accounts[userLogin]
 629         if account == nil {
 630                 errorT := cc.NewErrReply(t, "Account does not exist.")
 631                 res = append(res, errorT)
 632                 return res, err
 633         }
 634
 635         res = append(res, cc.NewReply(t,
 636                 NewField(fieldUserName, []byte(account.Name)),
 637                 NewField(fieldUserLogin, negateString(t.GetField(fieldUserLogin).Data)),
 638                 NewField(fieldUserPassword, []byte(account.Password)),
 639                 NewField(fieldUserAccess, *account.Access),
 640         ))
 641         return res, err
 642 }
 643
 644 func HandleListUsers(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 645         var userFields []Field
 646         // TODO: make order deterministic
 647         for _, acc := range cc.Server.Accounts {
 648                 userField := acc.Payload()
 649                 userFields = append(userFields, NewField(fieldData, userField))
 650         }
 651
 652         res = append(res, cc.NewReply(t, userFields...))
 653         return res, err
 654 }
 655
 656 // HandleNewUser creates a new user account
 657 func HandleNewUser(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 658         login := DecodeUserString(t.GetField(fieldUserLogin).Data)
 659
 660         // If the account already exists, reply with an error
 661         // TODO: make order deterministic
 662         if _, ok := cc.Server.Accounts[login]; ok {
 663                 res = append(res, cc.NewErrReply(t, "Cannot create account "+login+" because there is already an account with that login."))
 664                 return res, err
 665         }
 666
 667         if err := cc.Server.NewUser(
 668                 login,
 669                 string(t.GetField(fieldUserName).Data),
 670                 string(t.GetField(fieldUserPassword).Data),
 671                 t.GetField(fieldUserAccess).Data,
 672         ); err != nil {
 673                 return []Transaction{}, err
 674         }
 675
 676         res = append(res, cc.NewReply(t))
 677         return res, err
 678 }
 679
 680 func HandleDeleteUser(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 681         // TODO: Handle case where account doesn't exist; e.g. delete race condition
 682         login := DecodeUserString(t.GetField(fieldUserLogin).Data)
 683
 684         if err := cc.Server.DeleteUser(login); err != nil {
 685                 return res, err
 686         }
 687
 688         res = append(res, cc.NewReply(t))
 689         return res, err
 690 }
 691
 692 // HandleUserBroadcast sends an Administrator Message to all connected clients of the server
 693 func HandleUserBroadcast(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 694         cc.sendAll(
 695                 tranServerMsg,
 696                 NewField(fieldData, t.GetField(tranGetMsgs).Data),
 697                 NewField(fieldChatOptions, []byte{0}),
 698         )
 699
 700         res = append(res, cc.NewReply(t))
 701         return res, err
 702 }
 703
 704 func byteToInt(bytes []byte) (int, error) {
 705         switch len(bytes) {
 706         case 2:
 707                 return int(binary.BigEndian.Uint16(bytes)), nil
 708         case 4:
 709                 return int(binary.BigEndian.Uint32(bytes)), nil
 710         }
 711
 712         return 0, errors.New("unknown byte length")
 713 }
 714
 715 func HandleGetClientConnInfoText(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 716         clientID, _ := byteToInt(t.GetField(fieldUserID).Data)
 717
 718         clientConn := cc.Server.Clients[uint16(clientID)]
 719         if clientConn == nil {
 720                 return res, errors.New("invalid client")
 721         }
 722
 723         // TODO: Implement non-hardcoded values
 724         template := `Nickname:   %s
 725 Name:       %s
 726 Account:    %s
 727 Address:    %s
 728
 729 -------- File Downloads ---------
 730
 731 %s
 732
 733 ------- Folder Downloads --------
 734
 735 None.
 736
 737 --------- File Uploads ----------
 738
 739 None.
 740
 741 -------- Folder Uploads ---------
 742
 743 None.
 744
 745 ------- Waiting Downloads -------
 746
 747 None.
 748
 749         `
 750
 751         activeDownloads := clientConn.Transfers[FileDownload]
 752         activeDownloadList := "None."
 753         for _, dl := range activeDownloads {
 754                 activeDownloadList += dl.String() + "\n"
 755         }
 756
 757         template = fmt.Sprintf(
 758                 template,
 759                 *clientConn.UserName,
 760                 clientConn.Account.Name,
 761                 clientConn.Account.Login,
 762                 clientConn.Connection.RemoteAddr().String(),
 763                 activeDownloadList,
 764         )
 765         template = strings.Replace(template, "\n", "\r", -1)
 766
 767         res = append(res, cc.NewReply(t,
 768                 NewField(fieldData, []byte(template)),
 769                 NewField(fieldUserName, *clientConn.UserName),
 770         ))
 771         return res, err
 772 }
 773
 774 func HandleGetUserNameList(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 775         res = append(res, cc.NewReply(t, cc.Server.connectedUsers()...))
 776
 777         return res, err
 778 }
 779
 780 func (cc *ClientConn) notifyNewUserHasJoined() (res []Transaction, err error) {
 781         // Notify other ccs that a new user has connected
 782         cc.NotifyOthers(
 783                 *NewTransaction(
 784                         tranNotifyChangeUser, nil,
 785                         NewField(fieldUserName, *cc.UserName),
 786                         NewField(fieldUserID, *cc.ID),
 787                         NewField(fieldUserIconID, *cc.Icon),
 788                         NewField(fieldUserFlags, *cc.Flags),
 789                 ),
 790         )
 791
 792         return res, nil
 793 }
 794
 795 func HandleTranAgreed(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 796         bs := make([]byte, 2)
 797         binary.BigEndian.PutUint16(bs, *cc.Server.NextGuestID)
 798
 799         *cc.UserName = t.GetField(fieldUserName).Data
 800         *cc.ID = bs
 801         *cc.Icon = t.GetField(fieldUserIconID).Data
 802
 803         options := t.GetField(fieldOptions).Data
 804         optBitmap := big.NewInt(int64(binary.BigEndian.Uint16(options)))
 805
 806         flagBitmap := big.NewInt(int64(binary.BigEndian.Uint16(*cc.Flags)))
 807
 808         // Check refuse private PM option
 809         if optBitmap.Bit(refusePM) == 1 {
 810                 flagBitmap.SetBit(flagBitmap, userFlagRefusePM, 1)
 811                 binary.BigEndian.PutUint16(*cc.Flags, uint16(flagBitmap.Int64()))
 812         }
 813
 814         // Check refuse private chat option
 815         if optBitmap.Bit(refuseChat) == 1 {
 816                 flagBitmap.SetBit(flagBitmap, userFLagRefusePChat, 1)
 817                 binary.BigEndian.PutUint16(*cc.Flags, uint16(flagBitmap.Int64()))
 818         }
 819
 820         // Check auto response
 821         if optBitmap.Bit(autoResponse) == 1 {
 822                 *cc.AutoReply = t.GetField(fieldAutomaticResponse).Data
 823         } else {
 824                 *cc.AutoReply = []byte{}
 825         }
 826
 827         _, _ = cc.notifyNewUserHasJoined()
 828
 829         res = append(res, cc.NewReply(t))
 830
 831         return res, err
 832 }
 833
 834 const defaultNewsDateFormat = "Jan02 15:04" // Jun23 20:49
 835 //  "Mon, 02 Jan 2006 15:04:05 MST"
 836
 837 const defaultNewsTemplate = `From %s (%s):
 838
 839 %s
 840
 841 __________________________________________________________`
 842
 843 // HandleTranOldPostNews updates the flat news
 844 // Fields used in this request:
 845 // 101  Data
 846 func HandleTranOldPostNews(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 847         cc.Server.flatNewsMux.Lock()
 848         defer cc.Server.flatNewsMux.Unlock()
 849
 850         newsDateTemplate := defaultNewsDateFormat
 851         if cc.Server.Config.NewsDateFormat != "" {
 852                 newsDateTemplate = cc.Server.Config.NewsDateFormat
 853         }
 854
 855         newsTemplate := defaultNewsTemplate
 856         if cc.Server.Config.NewsDelimiter != "" {
 857                 newsTemplate = cc.Server.Config.NewsDelimiter
 858         }
 859
 860         newsPost := fmt.Sprintf(newsTemplate+"\r", *cc.UserName, time.Now().Format(newsDateTemplate), t.GetField(fieldData).Data)
 861         newsPost = strings.Replace(newsPost, "\n", "\r", -1)
 862
 863         // update news in memory
 864         cc.Server.FlatNews = append([]byte(newsPost), cc.Server.FlatNews...)
 865
 866         // update news on disk
 867         if err := ioutil.WriteFile(cc.Server.ConfigDir+"MessageBoard.txt", cc.Server.FlatNews, 0644); err != nil {
 868                 return res, err
 869         }
 870
 871         // Notify all clients of updated news
 872         cc.sendAll(
 873                 tranNewMsg,
 874                 NewField(fieldData, []byte(newsPost)),
 875         )
 876
 877         res = append(res, cc.NewReply(t))
 878         return res, err
 879 }
 880
 881 func HandleDisconnectUser(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 882         clientConn := cc.Server.Clients[binary.BigEndian.Uint16(t.GetField(fieldUserID).Data)]
 883
 884         if authorize(clientConn.Account.Access, accessCannotBeDiscon) {
 885                 res = append(res, cc.NewErrReply(t, clientConn.Account.Login+" is not allowed to be disconnected."))
 886                 return res, err
 887         }
 888
 889         if err := clientConn.Connection.Close(); err != nil {
 890                 return res, err
 891         }
 892
 893         res = append(res, cc.NewReply(t))
 894         return res, err
 895 }
 896
 897 func HandleGetNewsCatNameList(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 898         // Fields used in the request:
 899         // 325  News path       (Optional)
 900
 901         newsPath := t.GetField(fieldNewsPath).Data
 902         cc.Server.Logger.Infow("NewsPath: ", "np", string(newsPath))
 903
 904         pathStrs := ReadNewsPath(t.GetField(fieldNewsPath).Data)
 905         cats := cc.Server.GetNewsCatByPath(pathStrs)
 906
 907         // To store the keys in slice in sorted order
 908         keys := make([]string, len(cats))
 909         i := 0
 910         for k := range cats {
 911                 keys[i] = k
 912                 i++
 913         }
 914         sort.Strings(keys)
 915
 916         var fieldData []Field
 917         for _, k := range keys {
 918                 cat := cats[k]
 919                 fieldData = append(fieldData, NewField(
 920                         fieldNewsCatListData15,
 921                         cat.Payload(),
 922                 ))
 923         }
 924
 925         res = append(res, cc.NewReply(t, fieldData...))
 926         return res, err
 927 }
 928
 929 func HandleNewNewsCat(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 930         name := string(t.GetField(fieldNewsCatName).Data)
 931         pathStrs := ReadNewsPath(t.GetField(fieldNewsPath).Data)
 932
 933         cats := cc.Server.GetNewsCatByPath(pathStrs)
 934         cats[name] = NewsCategoryListData15{
 935                 Name:     name,
 936                 Type:     []byte{0, 3},
 937                 Articles: map[uint32]*NewsArtData{},
 938                 SubCats:  make(map[string]NewsCategoryListData15),
 939         }
 940
 941         if err := cc.Server.writeThreadedNews(); err != nil {
 942                 return res, err
 943         }
 944         res = append(res, cc.NewReply(t))
 945         return res, err
 946 }
 947
 948 func HandleNewNewsFldr(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 949         // Fields used in the request:
 950         // 322  News category name
 951         // 325  News path
 952         name := string(t.GetField(fieldFileName).Data)
 953         pathStrs := ReadNewsPath(t.GetField(fieldNewsPath).Data)
 954
 955         cc.Server.Logger.Infof("Creating new news folder %s", name)
 956
 957         cats := cc.Server.GetNewsCatByPath(pathStrs)
 958         cats[name] = NewsCategoryListData15{
 959                 Name:     name,
 960                 Type:     []byte{0, 2},
 961                 Articles: map[uint32]*NewsArtData{},
 962                 SubCats:  make(map[string]NewsCategoryListData15),
 963         }
 964         if err := cc.Server.writeThreadedNews(); err != nil {
 965                 return res, err
 966         }
 967         res = append(res, cc.NewReply(t))
 968         return res, err
 969 }
 970
 971 // Fields used in the request:
 972 // 325  News path       Optional
 973 //
 974 // Reply fields:
 975 // 321  News article list data  Optional
 976 func HandleGetNewsArtNameList(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 977         pathStrs := ReadNewsPath(t.GetField(fieldNewsPath).Data)
 978
 979         var cat NewsCategoryListData15
 980         cats := cc.Server.ThreadedNews.Categories
 981
 982         for _, path := range pathStrs {
 983                 cat = cats[path]
 984                 cats = cats[path].SubCats
 985         }
 986
 987         nald := cat.GetNewsArtListData()
 988
 989         res = append(res, cc.NewReply(t, NewField(fieldNewsArtListData, nald.Payload())))
 990         return res, err
 991 }
 992
 993 func HandleGetNewsArtData(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
 994         // Request fields
 995         // 325  News path
 996         // 326  News article ID
 997         // 327  News article data flavor
 998
 999         pathStrs := ReadNewsPath(t.GetField(fieldNewsPath).Data)
1000
1001         var cat NewsCategoryListData15
1002         cats := cc.Server.ThreadedNews.Categories
1003
1004         for _, path := range pathStrs {
1005                 cat = cats[path]
1006                 cats = cats[path].SubCats
1007         }
1008         newsArtID := t.GetField(fieldNewsArtID).Data
1009
1010         convertedArtID := binary.BigEndian.Uint16(newsArtID)
1011
1012         art := cat.Articles[uint32(convertedArtID)]
1013         if art == nil {
1014                 res = append(res, cc.NewReply(t))
1015                 return res, err
1016         }
1017
1018         // Reply fields
1019         // 328  News article title
1020         // 329  News article poster
1021         // 330  News article date
1022         // 331  Previous article ID
1023         // 332  Next article ID
1024         // 335  Parent article ID
1025         // 336  First child article ID
1026         // 327  News article data flavor        "Should be “text/plain”
1027         // 333  News article data       Optional (if data flavor is “text/plain”)
1028
1029         res = append(res, cc.NewReply(t,
1030                 NewField(fieldNewsArtTitle, []byte(art.Title)),
1031                 NewField(fieldNewsArtPoster, []byte(art.Poster)),
1032                 NewField(fieldNewsArtDate, art.Date),
1033                 NewField(fieldNewsArtPrevArt, art.PrevArt),
1034                 NewField(fieldNewsArtNextArt, art.NextArt),
1035                 NewField(fieldNewsArtParentArt, art.ParentArt),
1036                 NewField(fieldNewsArt1stChildArt, art.FirstChildArt),
1037                 NewField(fieldNewsArtDataFlav, []byte("text/plain")),
1038                 NewField(fieldNewsArtData, []byte(art.Data)),
1039         ))
1040         return res, err
1041 }
1042
1043 func HandleDelNewsItem(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
1044         // Access:              News Delete Folder (37) or News Delete Category (35)
1045
1046         pathStrs := ReadNewsPath(t.GetField(fieldNewsPath).Data)
1047
1048         // TODO: determine if path is a Folder (Bundle) or Category and check for permission
1049
1050         cc.Server.Logger.Infof("DelNewsItem %v", pathStrs)
1051
1052         cats := cc.Server.ThreadedNews.Categories
1053
1054         delName := pathStrs[len(pathStrs)-1]
1055         if len(pathStrs) > 1 {
1056                 for _, path := range pathStrs[0 : len(pathStrs)-1] {
1057                         cats = cats[path].SubCats
1058                 }
1059         }
1060
1061         delete(cats, delName)
1062
1063         err = cc.Server.writeThreadedNews()
1064         if err != nil {
1065                 return res, err
1066         }
1067
1068         // Reply params: none
1069         res = append(res, cc.NewReply(t))
1070
1071         return res, err
1072 }
1073
1074 func HandleDelNewsArt(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
1075         // Request Fields
1076         // 325  News path
1077         // 326  News article ID
1078         // 337  News article – recursive delete       Delete child articles (1) or not (0)
1079         pathStrs := ReadNewsPath(t.GetField(fieldNewsPath).Data)
1080         ID := binary.BigEndian.Uint16(t.GetField(fieldNewsArtID).Data)
1081
1082         // TODO: Delete recursive
1083         cats := cc.Server.GetNewsCatByPath(pathStrs[:len(pathStrs)-1])
1084
1085         catName := pathStrs[len(pathStrs)-1]
1086         cat := cats[catName]
1087
1088         delete(cat.Articles, uint32(ID))
1089
1090         cats[catName] = cat
1091         if err := cc.Server.writeThreadedNews(); err != nil {
1092                 return res, err
1093         }
1094
1095         res = append(res, cc.NewReply(t))
1096         return res, err
1097 }
1098
1099 func HandlePostNewsArt(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
1100         // Request fields
1101         // 325  News path
1102         // 326  News article ID                                                 ID of the parent article?
1103         // 328  News article title
1104         // 334  News article flags
1105         // 327  News article data flavor                Currently “text/plain”
1106         // 333  News article data
1107
1108         pathStrs := ReadNewsPath(t.GetField(fieldNewsPath).Data)
1109         cats := cc.Server.GetNewsCatByPath(pathStrs[:len(pathStrs)-1])
1110
1111         catName := pathStrs[len(pathStrs)-1]
1112         cat := cats[catName]
1113
1114         newArt := NewsArtData{
1115                 Title:         string(t.GetField(fieldNewsArtTitle).Data),
1116                 Poster:        string(*cc.UserName),
1117                 Date:          NewsDate(),
1118                 PrevArt:       []byte{0, 0, 0, 0},
1119                 NextArt:       []byte{0, 0, 0, 0},
1120                 ParentArt:     append([]byte{0, 0}, t.GetField(fieldNewsArtID).Data...),
1121                 FirstChildArt: []byte{0, 0, 0, 0},
1122                 DataFlav:      []byte("text/plain"),
1123                 Data:          string(t.GetField(fieldNewsArtData).Data),
1124         }
1125
1126         var keys []int
1127         for k := range cat.Articles {
1128                 keys = append(keys, int(k))
1129         }
1130
1131         nextID := uint32(1)
1132         if len(keys) > 0 {
1133                 sort.Ints(keys)
1134                 prevID := uint32(keys[len(keys)-1])
1135                 nextID = prevID + 1
1136
1137                 binary.BigEndian.PutUint32(newArt.PrevArt, prevID)
1138
1139                 // Set next article ID
1140                 binary.BigEndian.PutUint32(cat.Articles[prevID].NextArt, nextID)
1141         }
1142
1143         // Update parent article with first child reply
1144         parentID := binary.BigEndian.Uint16(t.GetField(fieldNewsArtID).Data)
1145         if parentID != 0 {
1146                 parentArt := cat.Articles[uint32(parentID)]
1147
1148                 if bytes.Equal(parentArt.FirstChildArt, []byte{0, 0, 0, 0}) {
1149                         binary.BigEndian.PutUint32(parentArt.FirstChildArt, nextID)
1150                 }
1151         }
1152
1153         cat.Articles[nextID] = &newArt
1154
1155         cats[catName] = cat
1156         if err := cc.Server.writeThreadedNews(); err != nil {
1157                 return res, err
1158         }
1159
1160         res = append(res, cc.NewReply(t))
1161         return res, err
1162 }
1163
1164 // HandleGetMsgs returns the flat news data
1165 func HandleGetMsgs(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
1166         res = append(res, cc.NewReply(t, NewField(fieldData, cc.Server.FlatNews)))
1167
1168         return res, err
1169 }
1170
1171 func HandleDownloadFile(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
1172         fileName := t.GetField(fieldFileName).Data
1173         filePath := ReadFilePath(t.GetField(fieldFilePath).Data)
1174
1175         ffo, err := NewFlattenedFileObject(cc.Server.Config.FileRoot+filePath, string(fileName))
1176         if err != nil {
1177                 return res, err
1178         }
1179
1180         transactionRef := cc.Server.NewTransactionRef()
1181         data := binary.BigEndian.Uint32(transactionRef)
1182
1183         cc.Server.Logger.Infow("File download", "path", filePath)
1184
1185         ft := &FileTransfer{
1186                 FileName:        fileName,
1187                 FilePath:        []byte(filePath),
1188                 ReferenceNumber: transactionRef,
1189                 Type:            FileDownload,
1190         }
1191
1192         cc.Server.FileTransfers[data] = ft
1193         cc.Transfers[FileDownload] = append(cc.Transfers[FileDownload], ft)
1194
1195         res = append(res, cc.NewReply(t,
1196                 NewField(fieldRefNum, transactionRef),
1197                 NewField(fieldWaitingCount, []byte{0x00, 0x00}), // TODO: Implement waiting count
1198                 NewField(fieldTransferSize, ffo.TransferSize()),
1199                 NewField(fieldFileSize, ffo.FlatFileDataForkHeader.DataSize),
1200         ))
1201
1202         return res, err
1203 }
1204
1205 // Download all files from the specified folder and sub-folders
1206 // response example
1207 //
1208 //      00
1209 //      01
1210 //      00 00
1211 //      00 00 00 11
1212 //      00 00 00 00
1213 //      00 00 00 18
1214 //      00 00 00 18
1215 //
1216 //      00 03
1217 //
1218 //      00 6c // transfer size
1219 //      00 04 // len
1220 //      00 0f d5 ae
1221 //
1222 //      00 dc // field Folder item count
1223 //      00 02 // len
1224 //      00 02
1225 //
1226 //      00 6b // ref number
1227 //      00 04 // len
1228 //      00 03 64 b1
1229 func HandleDownloadFolder(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
1230         transactionRef := cc.Server.NewTransactionRef()
1231         data := binary.BigEndian.Uint32(transactionRef)
1232
1233         fileTransfer := &FileTransfer{
1234                 FileName:        t.GetField(fieldFileName).Data,
1235                 FilePath:        t.GetField(fieldFilePath).Data,
1236                 ReferenceNumber: transactionRef,
1237                 Type:            FolderDownload,
1238         }
1239         cc.Server.FileTransfers[data] = fileTransfer
1240         cc.Transfers[FolderDownload] = append(cc.Transfers[FolderDownload], fileTransfer)
1241
1242         fp := NewFilePath(t.GetField(fieldFilePath).Data)
1243
1244         fullFilePath := fmt.Sprintf("./%v/%v", cc.Server.Config.FileRoot+fp.String(), string(fileTransfer.FileName))
1245         transferSize, err := CalcTotalSize(fullFilePath)
1246         if err != nil {
1247                 return res, err
1248         }
1249         itemCount, err := CalcItemCount(fullFilePath)
1250         if err != nil {
1251                 return res, err
1252         }
1253         res = append(res, cc.NewReply(t,
1254                 NewField(fieldRefNum, transactionRef),
1255                 NewField(fieldTransferSize, transferSize),
1256                 NewField(fieldFolderItemCount, itemCount),
1257                 NewField(fieldWaitingCount, []byte{0x00, 0x00}), // TODO: Implement waiting count
1258         ))
1259         return res, err
1260 }
1261
1262 // Upload all files from the local folder and its subfolders to the specified path on the server
1263 // Fields used in the request
1264 // 201  File name
1265 // 202  File path
1266 // 108  transfer size   Total size of all items in the folder
1267 // 220  Folder item count
1268 // 204  File transfer options   "Optional Currently set to 1" (TODO: ??)
1269 func HandleUploadFolder(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
1270         transactionRef := cc.Server.NewTransactionRef()
1271         data := binary.BigEndian.Uint32(transactionRef)
1272
1273         fileTransfer := &FileTransfer{
1274                 FileName:        t.GetField(fieldFileName).Data,
1275                 FilePath:        t.GetField(fieldFilePath).Data,
1276                 ReferenceNumber: transactionRef,
1277                 Type:            FolderUpload,
1278                 FolderItemCount: t.GetField(fieldFolderItemCount).Data,
1279                 TransferSize:    t.GetField(fieldTransferSize).Data,
1280         }
1281         cc.Server.FileTransfers[data] = fileTransfer
1282
1283         res = append(res, cc.NewReply(t, NewField(fieldRefNum, transactionRef)))
1284         return res, err
1285 }
1286
1287 func HandleUploadFile(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
1288         fileName := t.GetField(fieldFileName).Data
1289         filePath := t.GetField(fieldFilePath).Data
1290
1291         transactionRef := cc.Server.NewTransactionRef()
1292         data := binary.BigEndian.Uint32(transactionRef)
1293
1294         fileTransfer := &FileTransfer{
1295                 FileName:        fileName,
1296                 FilePath:        filePath,
1297                 ReferenceNumber: transactionRef,
1298                 Type:            FileUpload,
1299         }
1300
1301         cc.Server.FileTransfers[data] = fileTransfer
1302
1303         res = append(res, cc.NewReply(t, NewField(fieldRefNum, transactionRef)))
1304         return res, err
1305 }
1306
1307 // User options
1308 const (
1309         refusePM     = 0
1310         refuseChat   = 1
1311         autoResponse = 2
1312 )
1313
1314 func HandleSetClientUserInfo(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
1315         var icon []byte
1316         if len(t.GetField(fieldUserIconID).Data) == 4 {
1317                 icon = t.GetField(fieldUserIconID).Data[2:]
1318         } else {
1319                 icon = t.GetField(fieldUserIconID).Data
1320         }
1321         *cc.Icon = icon
1322         *cc.UserName = t.GetField(fieldUserName).Data
1323
1324         // the options field is only passed by the client versions > 1.2.3.
1325         options := t.GetField(fieldOptions).Data
1326
1327         if options != nil {
1328                 optBitmap := big.NewInt(int64(binary.BigEndian.Uint16(options)))
1329                 flagBitmap := big.NewInt(int64(binary.BigEndian.Uint16(*cc.Flags)))
1330
1331                 // Check refuse private PM option
1332                 if optBitmap.Bit(refusePM) == 1 {
1333                         flagBitmap.SetBit(flagBitmap, userFlagRefusePM, 1)
1334                         binary.BigEndian.PutUint16(*cc.Flags, uint16(flagBitmap.Int64()))
1335                 }
1336
1337                 // Check refuse private chat option
1338                 if optBitmap.Bit(refuseChat) == 1 {
1339                         flagBitmap.SetBit(flagBitmap, userFLagRefusePChat, 1)
1340                         binary.BigEndian.PutUint16(*cc.Flags, uint16(flagBitmap.Int64()))
1341                 }
1342
1343                 // Check auto response
1344                 if optBitmap.Bit(autoResponse) == 1 {
1345                         *cc.AutoReply = t.GetField(fieldAutomaticResponse).Data
1346                 } else {
1347                         *cc.AutoReply = []byte{}
1348                 }
1349         }
1350
1351         // Notify all clients of updated user info
1352         cc.sendAll(
1353                 tranNotifyChangeUser,
1354                 NewField(fieldUserID, *cc.ID),
1355                 NewField(fieldUserIconID, *cc.Icon),
1356                 NewField(fieldUserFlags, *cc.Flags),
1357                 NewField(fieldUserName, *cc.UserName),
1358         )
1359
1360         return res, err
1361 }
1362
1363 // HandleKeepAlive response to keepalive transactions with an empty reply
1364 // HL 1.9.2 Client sends keepalive msg every 3 minutes
1365 // HL 1.2.3 Client doesn't send keepalives
1366 func HandleKeepAlive(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
1367         res = append(res, cc.NewReply(t))
1368
1369         return res, err
1370 }
1371
1372 func HandleGetFileNameList(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
1373         filePath := cc.Server.Config.FileRoot
1374
1375         path := t.GetField(fieldFilePath).Data
1376         if len(path) > 0 {
1377                 filePath = cc.Server.Config.FileRoot + ReadFilePath(path)
1378         }
1379
1380         fileNames, err := getFileNameList(filePath)
1381         if err != nil {
1382                 return res, err
1383         }
1384
1385         res = append(res, cc.NewReply(t, fileNames...))
1386
1387         return res, err
1388 }
1389
1390 // =================================
1391 //     Hotline private chat flow
1392 // =================================
1393 // 1. ClientA sends tranInviteNewChat to server with user ID to invite
1394 // 2. Server creates new ChatID
1395 // 3. Server sends tranInviteToChat to invitee
1396 // 4. Server replies to ClientA with new Chat ID
1397 //
1398 // A dialog box pops up in the invitee client with options to accept or decline the invitation.
1399 // If Accepted is clicked:
1400 // 1. ClientB sends tranJoinChat with fieldChatID
1401
1402 // HandleInviteNewChat invites users to new private chat
1403 func HandleInviteNewChat(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
1404         // Client to Invite
1405         targetID := t.GetField(fieldUserID).Data
1406         newChatID := cc.Server.NewPrivateChat(cc)
1407
1408         res = append(res,
1409                 *NewTransaction(
1410                         tranInviteToChat,
1411                         &targetID,
1412                         NewField(fieldChatID, newChatID),
1413                         NewField(fieldUserName, *cc.UserName),
1414                         NewField(fieldUserID, *cc.ID),
1415                 ),
1416         )
1417
1418         res = append(res,
1419                 cc.NewReply(t,
1420                         NewField(fieldChatID, newChatID),
1421                         NewField(fieldUserName, *cc.UserName),
1422                         NewField(fieldUserID, *cc.ID),
1423                         NewField(fieldUserIconID, *cc.Icon),
1424                         NewField(fieldUserFlags, *cc.Flags),
1425                 ),
1426         )
1427
1428         return res, err
1429 }
1430
1431 func HandleInviteToChat(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
1432         // Client to Invite
1433         targetID := t.GetField(fieldUserID).Data
1434         chatID := t.GetField(fieldChatID).Data
1435
1436         res = append(res,
1437                 *NewTransaction(
1438                         tranInviteToChat,
1439                         &targetID,
1440                         NewField(fieldChatID, chatID),
1441                         NewField(fieldUserName, *cc.UserName),
1442                         NewField(fieldUserID, *cc.ID),
1443                 ),
1444         )
1445         res = append(res,
1446                 cc.NewReply(
1447                         t,
1448                         NewField(fieldChatID, chatID),
1449                         NewField(fieldUserName, *cc.UserName),
1450                         NewField(fieldUserID, *cc.ID),
1451                         NewField(fieldUserIconID, *cc.Icon),
1452                         NewField(fieldUserFlags, *cc.Flags),
1453                 ),
1454         )
1455
1456         return res, err
1457 }
1458
1459 func HandleRejectChatInvite(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
1460         chatID := t.GetField(fieldChatID).Data
1461         chatInt := binary.BigEndian.Uint32(chatID)
1462
1463         privChat := cc.Server.PrivateChats[chatInt]
1464
1465         resMsg := append(*cc.UserName, []byte(" declined invitation to chat")...)
1466
1467         for _, c := range sortedClients(privChat.ClientConn) {
1468                 res = append(res,
1469                         *NewTransaction(
1470                                 tranChatMsg,
1471                                 c.ID,
1472                                 NewField(fieldChatID, chatID),
1473                                 NewField(fieldData, resMsg),
1474                         ),
1475                 )
1476         }
1477
1478         return res, err
1479 }
1480
1481 // HandleJoinChat is sent from a v1.8+ Hotline client when the joins a private chat
1482 // Fields used in the reply:
1483 // * 115        Chat subject
1484 // * 300        User name with info (Optional)
1485 // * 300        (more user names with info)
1486 func HandleJoinChat(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
1487         chatID := t.GetField(fieldChatID).Data
1488         chatInt := binary.BigEndian.Uint32(chatID)
1489
1490         privChat := cc.Server.PrivateChats[chatInt]
1491
1492         // Send tranNotifyChatChangeUser to current members of the chat to inform of new user
1493         for _, c := range sortedClients(privChat.ClientConn) {
1494                 res = append(res,
1495                         *NewTransaction(
1496                                 tranNotifyChatChangeUser,
1497                                 c.ID,
1498                                 NewField(fieldChatID, chatID),
1499                                 NewField(fieldUserName, *cc.UserName),
1500                                 NewField(fieldUserID, *cc.ID),
1501                                 NewField(fieldUserIconID, *cc.Icon),
1502                                 NewField(fieldUserFlags, *cc.Flags),
1503                         ),
1504                 )
1505         }
1506
1507         privChat.ClientConn[cc.uint16ID()] = cc
1508
1509         replyFields := []Field{NewField(fieldChatSubject, []byte(privChat.Subject))}
1510         for _, c := range sortedClients(privChat.ClientConn) {
1511                 user := User{
1512                         ID:    *c.ID,
1513                         Icon:  *c.Icon,
1514                         Flags: *c.Flags,
1515                         Name:  string(*c.UserName),
1516                 }
1517
1518                 replyFields = append(replyFields, NewField(fieldUsernameWithInfo, user.Payload()))
1519         }
1520
1521         res = append(res, cc.NewReply(t, replyFields...))
1522         return res, err
1523 }
1524
1525 // HandleLeaveChat is sent from a v1.8+ Hotline client when the user exits a private chat
1526 // Fields used in the request:
1527 //      * 114   fieldChatID
1528 // Reply is not expected.
1529 func HandleLeaveChat(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
1530         chatID := t.GetField(fieldChatID).Data
1531         chatInt := binary.BigEndian.Uint32(chatID)
1532
1533         privChat := cc.Server.PrivateChats[chatInt]
1534
1535         delete(privChat.ClientConn, cc.uint16ID())
1536
1537         // Notify members of the private chat that the user has left
1538         for _, c := range sortedClients(privChat.ClientConn) {
1539                 res = append(res,
1540                         *NewTransaction(
1541                                 tranNotifyChatDeleteUser,
1542                                 c.ID,
1543                                 NewField(fieldChatID, chatID),
1544                                 NewField(fieldUserID, *cc.ID),
1545                         ),
1546                 )
1547         }
1548
1549         return res, err
1550 }
1551
1552 // HandleSetChatSubject is sent from a v1.8+ Hotline client when the user sets a private chat subject
1553 // Fields used in the request:
1554 // * 114        Chat ID
1555 // * 115        Chat subject    Chat subject string
1556 // Reply is not expected.
1557 func HandleSetChatSubject(cc *ClientConn, t *Transaction) (res []Transaction, err error) {
1558         chatID := t.GetField(fieldChatID).Data
1559         chatInt := binary.BigEndian.Uint32(chatID)
1560
1561         privChat := cc.Server.PrivateChats[chatInt]
1562         privChat.Subject = string(t.GetField(fieldChatSubject).Data)
1563
1564         for _, c := range sortedClients(privChat.ClientConn) {
1565                 res = append(res,
1566                         *NewTransaction(
1567                                 tranNotifyChatSubject,
1568                                 c.ID,
1569                                 NewField(fieldChatID, chatID),
1570                                 NewField(fieldChatSubject, t.GetField(fieldChatSubject).Data),
1571                         ),
1572                 )
1573         }
1574
1575         return res, err
1576 }