// Helper function for handleRequest - handles the case where we are received meta.info file.
// @param net.Conn conn - The socket which the client is asking on
// @param string request - The request sent to tracker
// @return error - An error can be produced when trying to send a file or if there is incorrect
// syntax in the request - otherwise error will be nil.
func handlePush(request string, conn net.Conn) error {
// Client syntax for push is "Meta_Push:<LynkName>\n"
// So tmpArr[0] - Meta_Push | tmpArr[1] - <LynkName>
tmpArr := strings.Split(request, ":")
if len(tmpArr) != 2 {
conn.Close()
return errors.New("Invalid Request Syntax")
}
if client.IsDownloading(tmpArr[1]) {
client.StopDownload(tmpArr[1])
}
metaPath := lynxutil.HomePath + tmpArr[1] + "/"
err := os.Remove(metaPath)
if err != nil {
fmt.Println(err)
return err
}
newMetainfo, err := os.Create(metaPath)
if err != nil {
fmt.Println(err)
return err
}
bufIn, err := ioutil.ReadAll(conn)
// Decrypt
//key := []byte("abcdefghijklmnopqrstuvwxyz123456")
key := []byte(lynxutil.PrivateKey)
var plainFile []byte
if plainFile, err = mycrypt.Decrypt(key, bufIn); err != nil {
log.Fatal(err)
}
// Decompress
r, _ := gzip.NewReader(bytes.NewBuffer(plainFile))
bufOut, _ := ioutil.ReadAll(r)
r.Read(bufOut)
r.Close()
fmt.Println(len(bufIn), "Bytes Received")
newMetainfo.Write(bufOut)
return nil // No errors if we reached this point
}
// The function responsible for actually asking for a file from a peer
// @param string lynkName - The name of the lynk we're asking about
// @param string fileName - The name of the file to find in the peers
// @param net.Conn conn - The connection to the peer
// @return bool - True or false is returned based on whether or not we successfully received a file
func askForFile(lynkName, fileName string, conn net.Conn) bool {
fmt.Fprintf(conn, "Do_You_Have_FileName:"+lynkName+"/"+fileName+"\n")
reply, err := bufio.NewReader(conn).ReadString('\n') // Waits for a String ending in newline
reply = strings.TrimSpace(reply)
gotFile := false
// Has file and no errors
if reply != "NO" && err == nil {
file, err := os.Create(lynxutil.HomePath + lynkName + "/" + fileName)
if err != nil {
return gotFile
}
defer file.Close()
bufIn, err := ioutil.ReadAll(conn)
if err != nil {
return gotFile
}
// Decrypt
//key := []byte("abcdefghijklmnopqrstuvwxyz123456")
key := []byte(lynxutil.PrivateKey)
var plainFile []byte
if plainFile, err = mycrypt.Decrypt(key, bufIn); err != nil {
log.Fatal(err)
}
// Decompress
r, _ := gzip.NewReader(bytes.NewBuffer(plainFile))
bufOut, _ := ioutil.ReadAll(r)
r.Read(bufOut)
r.Close()
fmt.Println(len(bufIn), "Bytes Received")
file.Write(bufOut)
gotFile = true
}
return gotFile
}
// Unit tests for listen, handle, and send functions as well as push meta
// @param *testing.T t - The wrapper for the test
func TestListenHandleSend(t *testing.T) {
fmt.Println("\n----------------TestListen----------------")
conn, err := net.Dial("tcp", "127.0.0.1:8080")
if err != nil {
t.Error(err.Error())
} else {
fmt.Println("Successfully Connected To Server")
successful++
}
fmt.Println("\n----------------TestHandleRequest----------------")
fmt.Fprintf(conn, "Do_You_Have_FileName:Tests/fake.txt\n")
reply, err := bufio.NewReader(conn).ReadString('\n') // Waits for a String ending in newline
reply = strings.TrimSpace(reply)
if reply == "NO" {
fmt.Println("Successfully Handled Invalid Request")
successful++
} else {
t.Error("Test failed, expected to have server respond 'NO'. Got", reply)
}
conn.Close()
conn, err = net.Dial("tcp", "127.0.0.1:8080")
fmt.Fprintf(conn, "Do_You_Have_FileName:Tests/test.txt\n")
reply, err = bufio.NewReader(conn).ReadString('\n') // Waits for a String ending in newline
reply = strings.TrimSpace(reply)
if reply == "YES" {
fmt.Println("Successfully Handled Valid Request")
successful++
} else {
t.Error("Test failed, expected to have server respond 'YES'. Got", reply)
}
fmt.Println("\n----------------TestSendFile----------------")
file, err := os.Create("test.txt_ServerTest")
if err != nil {
t.Error(err.Error())
}
defer file.Close()
bufIn := make([]byte, 512) // Set to 512 because we know this file is small
_, err = conn.Read(bufIn)
// Decrypt
//key := []byte("abcdefghijklmnopqrstuvwxyz123456")
key := []byte(lynxutil.PrivateKey)
var plainFile []byte
if plainFile, err = mycrypt.Decrypt(key, bufIn); err != nil {
log.Fatal(err)
}
// Decompress
r, err := gzip.NewReader(bytes.NewBuffer(plainFile))
bufOut := make([]byte, 512) // Set to 512 because we know this file is small
r.Read(bufOut)
file.Write(bufOut)
r.Close()
if err != nil {
t.Error(err.Error())
} else {
fmt.Println("Successfully Sent 'text.txt'")
successful++
}
content, _ := ioutil.ReadFile("test.txt_ServerTest")
s := string(content)
if !strings.Contains(s, "test contents") {
t.Error("File contents invalid. Got '" + s + "'")
} else {
fmt.Println("File contents valid.")
successful++
}
fmt.Println("\n----------------TestPushMeta----------------")
if err != nil {
t.Error(err.Error())
} else {
fmt.Println("Successfully Pushed Meta")
successful++
}
fmt.Println("\nSuccess on ", successful, "/", total, " tests.")
}
