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handlers.go
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handlers.go
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package main
import (
"encoding/gob"
"fmt"
"github.com/gorilla/websocket"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"strconv"
"strings"
"time"
)
var (
upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
}
)
const uploadSessionName = "upload"
// TogglePermCodeHandler either turns on or off a users perm code depending if they have one already
func (s *Server) TogglePermCodeHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
WriteError(w, r, 400, "Invalid method")
return
}
// fetch post data
if err := r.ParseForm(); err != nil {
WriteError(w, r, 400, "Invalid form data")
return
}
user := User{
UUID: r.Form.Get("UUID"),
UUIDKey: r.Form.Get("UUID_key"),
}
if !user.IsValid(s.db) {
log.Println("Invalid credentials")
WriteError(w, r, 400, "Invalid form data")
return
}
user.GetTier(s.db)
if user.Tier >= permUserTier {
permCode, customCode := GetUserPermCode(s.db, user)
if permCode.Valid || customCode.Valid {
// remove any stored codes (INCLUDING custom code) as they already have one or the other
err := RemovePermCodes(s.db, user)
Handle(err)
} else {
// turn on random perm code
user.Code = GenCode(s.db)
if err := SetPermCode(s.db, user); err != nil {
WriteError(w, r, 401, "Failed to set permanent code")
return
}
}
}
Handle(WriteJSON(w, user))
}
// CustomCodeHandler sets a users custom code
func (s *Server) CustomCodeHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
WriteError(w, r, 400, "Invalid method")
return
}
// fetch form
if err := r.ParseForm(); err != nil {
WriteError(w, r, 400, "Invalid form data")
return
}
user := User{
UUID: r.Form.Get("UUID"),
UUIDKey: r.Form.Get("UUID_key"),
}
if !user.IsValid(s.db) {
WriteError(w, r, 400, "Invalid form data")
return
}
user.Code = r.Form.Get("custom_code")
if len(user.Code) != codeLen {
WriteError(w, r, 401, "Invalid custom code")
return
}
user.GetTier(s.db)
if user.Tier >= customCodeUserTier {
err := SetCustomCode(s.db, user)
if err == nil {
Handle(WriteJSON(w, user))
return
}
Handle(err)
}
WriteError(w, r, 402, "Failed to set activation code")
}
// RegisterCreditHandler will associate a credit code to an account
func (s *Server) RegisterCreditHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
WriteError(w, r, 400, "Invalid method")
return
}
// fetch form
if err := r.ParseForm(); err != nil {
WriteError(w, r, 400, "Invalid form data")
return
}
user := User{
UUID: r.Form.Get("UUID"),
UUIDKey: r.Form.Get("UUID_key"),
}
if !user.IsValid(s.db) {
WriteError(w, r, 400, "Invalid form data")
return
}
creditCode := r.Form.Get("credit_code")
if len(creditCode) == CreditCodeLen {
if err := SetCreditCode(s.db, user, creditCode); err != nil {
WriteError(w, r, 401, "Failed to register credit")
return
}
}
}
// CreateCodeHandler creates an account and/or updates a users code
func (s *Server) CreateCodeHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
WriteError(w, r, 400, "Invalid method")
return
}
// fetch form
if err := r.ParseForm(); err != nil {
WriteError(w, r, 400, "Invalid form data")
return
}
user := User{}
user.UUID = r.Form.Get("UUID")
user.UUIDKey = r.Form.Get("UUID_key")
user.PublicKey = r.Form.Get("public_key")
if user.UUID == "" {
WriteError(w, r, 400, "Invalid form data")
return
}
if user.PublicKey == "" {
WriteError(w, r, 401, "Invalid form data")
return
}
if !IsValidPublicKey(user.PublicKey) {
WriteError(w, r, 401, "Invalid public key in keychain!")
return
}
wantedMins, err := strconv.Atoi(r.Form.Get("wanted_mins")) // convert to int
if err != nil {
wantedMins = defaultAccountLifeMins
}
user.SetWantedMins(s.db, wantedMins)
user.Code = GenCode(s.db)
UUIDKey, userExists := user.GetUUIDKey(s.db)
if userExists && len(UUIDKey) > 0 && !user.IsValid(s.db) {
WriteError(w, r, 402, "Invalid UUID key. Ask hello@transferme.it to reset")
return
} else if !userExists {
// create new tmi user
log.Println("Creating new user " + user.UUID)
user.UUIDKey = RandomString(keyUUIDLen)
user.MaxFileSize = freeFileUploadBytes
user.BandwidthLeft = freeBandwidthBytes
user.MinsAllowed = defaultAccountLifeMins
user.WantedMins = defaultAccountLifeMins
user.Expiry = time.Now().Add(time.Minute * time.Duration(defaultAccountLifeMins)).UTC()
go user.Store(s.db)
} else {
if len(UUIDKey) == 0 {
// if key has been removed from db because of lost UUID key from client
log.Println("Resetting UUID key for " + user.UUID)
user.UUIDKey = RandomString(keyUUIDLen)
go user.UpdateUUIDKey(s.db)
} else {
user.UUIDKey = ""
}
// set perm code at client request
expectedPermCode := r.Form.Get("perm_user_code")
if len(expectedPermCode) != 0 {
SetUsersPermCode(s.db, &user, expectedPermCode)
}
user.Expiry = time.Now().Add(time.Minute * time.Duration(user.WantedMins)).UTC()
go user.Update(s.db)
}
Handle(WriteJSON(w, user))
}
// InitUploadHandler tells the server what to suspect in the UploadHandler and handles most file upload validation.
// This is done before so as to not have to wait for the file to be transferred to the server.
func (s *Server) InitUploadHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
WriteError(w, r, 400, "Invalid method")
return
}
// fetch form
if err := r.ParseForm(); err != nil {
WriteError(w, r, 400, "Invalid form data")
return
}
user := User{
UUID: r.Form.Get("UUID"),
UUIDKey: r.Form.Get("UUID_key"),
}
if !user.IsValid(s.db) {
WriteError(w, r, 400, "Invalid method")
return
}
filesize, err := strconv.Atoi(r.Form.Get("filesize"))
if err != nil {
WriteError(w, r, 401, "Invalid value for filesize") // TODO test
return
}
code := r.Form.Get("code")
friend := CodeToUser(s.db, code)
if friend.UUID == "" || friend.PublicKey == "" {
WriteError(w, r, 402, "Your friend does not exist!")
return
}
if friend.UUID == Hash(user.UUID) {
WriteError(w, r, 403, "Your can't send files to yourself!")
return
}
user.GetWantedMins(s.db)
user.GetBandwidthLeft(s.db)
if user.BandwidthLeft-filesize < 0 {
WriteError(w, r, 404, "This transfer exceeds today's bandwidth limit!")
return
}
user.GetMaxFileSize(s.db)
if user.MaxFileSize-filesize < 0 {
log.Printf("transfer with %v difference", BytesToMegabytes(user.MaxFileSize-filesize))
mb := BytesToMegabytes(user.MaxFileSize)
m := fmt.Sprintf("This transfer exceeds your %fMB max file transfer Size!", mb)
WriteError(w, r, 405, m)
return
}
transfer := Transfer{
from: user,
to: User{UUID: friend.UUID},
Size: filesize,
}
if transfer.AlreadyToUser(s.db) {
// already uploading to friend so delete the currently in process transfer
go transfer.Completed(s.db, true, false)
}
transfer.ID = transfer.InitialStore(s.db)
transfer.from.UUID = "" // for privacy remove the UUID
// store transfer information in session to be picked up by UploadHandler
session := InitSession(r)
gob.Register(Transfer{})
session.Values[uploadSessionName] = transfer
err = session.Save(r, w)
Handle(err)
_, err = w.Write([]byte(friend.PublicKey))
Handle(err)
}
// UploadHandler handles the file upload but only works after running InitUploadHandler
func (s *Server) UploadHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
WriteError(w, r, 400, "Invalid method")
return
}
// get session transfer
session := InitSession(r)
sessionTransfer := session.Values[uploadSessionName].(Transfer)
if sessionTransfer.ID == 0 {
WriteError(w, r, 401, "Init transfer not run")
return
}
// delete session
session.Values[uploadSessionName] = nil
err := session.Save(r, w)
Handle(err)
err = r.ParseMultipartForm(int64(maxFileUploadSizeMB << 20))
Handle(err)
// get POST data
if err := r.ParseForm(); err != nil {
Handle(err)
WriteError(w, r, 400, "Invalid form data")
return
}
// get (encrypted with friends public key) password
sessionTransfer.password = r.Form.Get("password")
// get file from form
file, handler, err := r.FormFile("file")
Handle(err)
defer file.Close()
// verify session data from InitUploadHandler against actual file Size
// should be less than expected as it should have been compressed since.
if int(handler.Size) > sessionTransfer.Size {
m := fmt.Sprintf("You lied about the transfer size expected %v got %v!", sessionTransfer.Size, int(handler.Size))
WriteError(w, r, 401, m)
return
}
// extract file to bytes
fileBytes, err := ioutil.ReadAll(file)
Handle(err)
// write file to server
dir := fileStoreDirectory + RandomString(userDirLen)
err = os.MkdirAll(dir, 0744)
Handle(err)
fileLocation := dir + "/" + handler.Filename
err = ioutil.WriteFile(fileLocation, fileBytes, 0744)
Handle(err)
// write full details in transfer struct
transfer := sessionTransfer
transfer.FilePath = strings.Replace(fileLocation, fileStoreDirectory, "", -1)
transfer.expiry = time.Now().Add(time.Minute * time.Duration(sessionTransfer.from.WantedMins))
transfer.hash = HashWithBytes(fileBytes)
transfer.Size = int(handler.Size)
Handle(transfer.Store(s.db))
// tell friend to download file
WSConns.Write(SocketMessage{
Download: &transfer,
}, transfer.to.UUID, true)
}
// DownloadHandler handles the download of the file
func (s *Server) DownloadHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
WriteError(w, r, 400, "Invalid method")
return
}
// fetch form
if err := r.ParseForm(); err != nil {
Handle(err)
WriteError(w, r, 400, "Invalid form data")
return
}
// get encrypted (with friends public key) password
user := User{
UUID: r.Form.Get("UUID"),
UUIDKey: r.Form.Get("UUID_key"),
}
if !user.IsValid(s.db) {
WriteError(w, r, 400, "Invalid form data")
return
}
filePath := r.Form.Get("file_path")
if !AllowedToDownload(s.db, user, filePath) {
WriteError(w, r, 401, "No such file at path!")
return
}
f, err := os.Open(fileStoreDirectory + filePath)
if err != nil {
Handle(err)
WriteError(w, r, 401, err.Error())
return
}
fi, err := f.Stat()
if err != nil {
Handle(err)
WriteError(w, r, 401, err.Error())
return
}
w.Header().Set("Content-Type", "application/octet-stream")
w.Header().Set("Content-Transfer-Encoding", "binary")
w.Header().Set("Content-Length", string(fi.Size()))
_, err = io.Copy(w, f)
Handle(err)
}
// CompletedDownloadHandler fetches the encrypted password of the uploaded file if passed a valid file hash
func (s *Server) CompletedDownloadHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
WriteError(w, r, 400, "Invalid method")
return
}
// fetch form
if err := r.ParseForm(); err != nil {
Handle(err)
WriteError(w, r, 400, "Invalid form data")
return
}
var user = User{
UUID: r.Form.Get("UUID"),
UUIDKey: r.Form.Get("UUID_key"),
}
if !user.IsValid(s.db) {
WriteError(w, r, 400, "Invalid form data")
return
}
var transfer = Transfer{
to: User{UUID: user.UUID},
FilePath: r.Form.Get("file_path"),
hash: r.Form.Get("hash"),
}
failed := true
if transfer.hash != "" {
failed = false
transfer.GetPasswordAndUUID(s.db)
if transfer.password == "" || transfer.from.UUID == "" {
log.Println("No password for user. Or already uploading to user", transfer)
WriteError(w, r, 402, "No password for user")
}
_, err := w.Write([]byte(transfer.password))
Handle(err)
}
transfer.Completed(s.db, failed, false)
}