HelloWorld 및 인터페이스

박영식2007.06.12 21:41조회 수 1999댓글 0

2
- 글자 크기

1. 설치는 쉬웠으나 책과 다른 점이 있어서 당황했다.

2. 실시간 Debugging이 가능하다.
- error가 있으면, 아예 컴파일이 안 된다.

3. 화려하다.

http://suritam9.woweb.net/HelloWorld/bin/HelloWorld.html

박영식 (비회원)

2
- 글자 크기

수정 삭제

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검색 정렬

[PHP] int bufferoverflow

[원문보기]

php bufferoverflow example 로 찾으면 검색되는 코드에서 이해를 위한 코드를 덧붙였다.

PHP_INT_MAX 값은 int 9223372036854775807 이고, 해당 값을 초과하면 9.2233720368548E+18 가 출력된다.

// 초기 값은 최대값에서 6을 뺀 값으로 설정하고, 최대 int 까지 배열 값을 지정했다.

$initval=9223372036854775801;

$arr[9223372036854775801]=1;

$arr[9223372036854775802]=2;

$arr[9223372036854775803]=3;

$arr[9223372036854775804]=4;

$arr[9223372036854775805]=5;

$arr[9223372036854775806]=6;

$arr[9223372036854775807]=7;

$chkval=$_GET["input"];

//입력 값을 chkval 이라는 변수에 할당하고

echo "<br />";

if($initval <= PHP_INT_MAX-$chkval){

echo "sum : ". $max = $initval + $chkval;

}else{

echo "overflow! ". $max = $initval + $chkval;

}

// 최대값을 넘지 않으면 input과 초기값의 합을 출력한다.

// 최대값을 넘으면 overflow 된 값을 출력한다.

echo "<br />";

echo "saved val : ";

echo "<br />";

// 배열값을 잘 참조하는지 참조하지 못한 값이 들어가면 오류가 발생하는 예를 보여주기 위해 각 배열 값을 출력했다.

for($i=0;$i<$chkval;$i++){

echo $initval+$i ." : ". $arr[$initval+$i];

echo "<br />";

}

[not overflow] input is 7

if input > 7 then overflow

sum : 9223372036854775807
saved val : 
9223372036854775801 : 1
9223372036854775802 : 2
9223372036854775803 : 3
9223372036854775804 : 4
9223372036854775805 : 5
9223372036854775806 : 6
9223372036854775807 : 7

[overflow] input is 8

overflow! 9.2233720368548E+18
saved val : 
9223372036854775801 : 1
9223372036854775802 : 2
9223372036854775803 : 3
9223372036854775804 : 4
9223372036854775805 : 5
9223372036854775806 : 6
9223372036854775807 : 7
9.2233720368548E+18 :

[pull챗봇] 행아웃 X Google Spreadsheet with Apps script

[원문보기]

구글의 예제코드는 공개되어 있으며, 단순 응답으로 되어 있다.

구글 앱스 스크립트(GS)를 주로 스프레드 열람 등에 썼기 때문에, 특정 시트 값을 가져오는 것은 너무나 익숙하다.

/**
* Responds to a MESSAGE event in Hangouts Chat.
*
* @param {Object} event the event object from Hangouts Chat
*/
function onMessage(event) {
var name = "";

if (event.space.type == "DM") {
name = "You2";
} else {
name = event.user.displayName;
}
var ss = SpreadsheetApp.openById("시트ID");
var s1 = ss.getSheetByName("시트2");
var r1 = s1.getRange(2, 1, 3, 4);
var v1 = r1.getValues();
var message = name + " said "" + event.message.text + """;
message = message + v1.join(" ");
return { "text": message };
}

/**
* Responds to an ADDED_TO_SPACE event in Hangouts Chat.
*
* @param {Object} event the event object from Hangouts Chat
*/
function onAddToSpace(event) {
var message = "";

if (event.space.type == "DM") {
message = "Thank you for adding me to a DM, " + event.user.displayName + "!";
} else {
message = "Thank you for adding me to " + event.space.displayName;
}

return { "text": message };
}

/**
* Responds to a REMOVED_FROM_SPACE event in Hangouts Chat.
*
* @param {Object} event the event object from Hangouts Chat
*/
function onRemoveFromSpace(event) {
console.info("Bot removed from ", event.space.name);
}

다른 점은 배포 방식인데, 매니페스트에서 배포를 선택해야 한다.

배포된 ID를 구글 클라우드 콘솔에서 Hangouts Chat API 구성에 추가한다.

[구글 클라우드 콘솔 Hangouts Chat API 구성]

해당 작업이 완료되면 채팅방에서 봇에게 말을 걸도록 추가해 줘야 한다.

기존 행아웃이 아닌 chat.google.com 으로 진행해야 하며, 모바일 앱 역시 행아웃 채팅이란 앱을 설치해야 한다.

좌측 상단의 사용자, 채팅방, 봇 찾기를 누르고 설정한 이름이 정상적으로 보이면 성공한 것이다.

스프레드시트 열람 권한을 얻는 것까지 절차를 거치면, 봇에게 스프레드시트의 내용을 보여주도록 할 수 있다.

[SSL] SSL 설정 파워쉘 스크립트

[원문보기]

4년 전 거라 조금 수정이 필요한 부분이 있다.

키 교환의 Diffie-Hellman는 0000000000 으로

TLS 1.3의 출시로 SSL ROBOT이 주목되는지는 모르겠지만, 키 교환과 암호화 방식, 검증 방식에 대해 가장 잘 설명된 그림을 찾았다.

윈도우즈 설정 참고 사이트

https://support.microsoft.com/ko-kr/help/245030/how-to-restrict-the-use-of-certain-cryptographic-algorithms-and-protoc

TLS 1.0과 RSA가 키교환 알고리즘으로 사용되는 서버의 예이다.

아래 파워쉘 스크립트를 이용해 설정을 보완할 수 있는데, 선택적으로 필요한 것을 적용하면, 취약점 제거에 용이할 것이다.

공개 키 암호 표준(Public-Key Cryptography Standard, PKCS)은 RSA 시큐리티에서 정한, 공개 키 암호에 대한 사용 방식에 대한 표준 프로토콜이다.

md 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELKeyExchangeAlgorithmsPKCS' -Force

New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELKeyExchangeAlgorithmsPKCS' -name Enabled -value '0x00000000' -PropertyType 'DWord' -Force

$cipherSuitesOrder = @( 'TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P521', 'TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384', 'TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256', 'TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA_P521', 'TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA_P384', 'TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA_P256', 'TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P521', 'TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA_P521', 'TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P384', 'TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256', 'TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA_P384', 'TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA_P256', 'TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384_P521', 'TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384_P384', 'TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256_P521', 'TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256_P384', 'TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256_P256', 'TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384_P521', 'TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384_P384', 'TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA_P521', 'TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA_P384', 'TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA_P256', 'TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256_P521', 'TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256_P384', 'TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256_P256', 'TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA_P521', 'TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA_P384', 'TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA_P256','TLS_RSA_WITH_AES_256_CBC_SHA256','TLS_RSA_WITH_AES_256_CBC_SHA','TLS_RSA_WITH_AES_128_CBC_SHA256','TLS_RSA_WITH_AES_128_CBC_SHA')

$cipherSuitesAsString = [string]::join(',', $cipherSuitesOrder)

New-ItemProperty -path 'HKLM:SOFTWAREPoliciesMicrosoftCryptographyConfigurationSSL�0010002' -name 'Functions' -value $cipherSuitesAsString -PropertyType 'String' -Force | Out-Null

New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.0Server' -name 'Enabled' -value '0x00000000' -PropertyType 'DWord' -Force

New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.0Server' -name 'DisabledByDefault' -value 1 -PropertyType 'DWord' -Force

기존 파워쉘 스크립트는 오래되어 수정이 필요하다.

https://gist.github.com/matejskubic/10268126

### http://www.hass.de/content/setup-your-iis-ssl-perfect-forward-secrecy-and-tls-12

# Add and Enable SSL 3.0 for client and server SCHANNEL communications
md 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsSSL 3.0' -Force
md 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsSSL 3.0Server' -Force
New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsSSL 3.0Server' -name 'Enabled' -value '0xffffffff' -PropertyType 'DWord' -Force
New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsSSL 3.0Server' -name 'DisabledByDefault' -value 0 -PropertyType 'DWord' -Force
 
# Add and Enable TLS 1.0 for client and server SCHANNEL communications
md 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.0' -Force
md 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.0Server' -Force
New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.0Server' -name 'Enabled' -value '0xffffffff' -PropertyType 'DWord' -Force
New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.0Server' -name 'DisabledByDefault' -value 0 -PropertyType 'DWord' -Force
 
# Add and Enable TLS 1.1 for client and server SCHANNEL communications
md 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.1' -Force
md 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.1Server' -Force
md 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.1Client' -Force
New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.1Server' -name 'Enabled' -value '0xffffffff' -PropertyType 'DWord' -Force
New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.1Server' -name 'DisabledByDefault' -value 0 -PropertyType 'DWord' -Force
New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.1Client' -name 'Enabled' -value 1 -PropertyType 'DWord' -Force
New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.1Client' -name 'DisabledByDefault' -value 0 -PropertyType 'DWord' -Force
 
# Add and Enable TLS 1.2 for client and server SCHANNEL communications
md 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.2' -Force
md 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.2Server' -Force
md 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.2Client' -Force
New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.2Server' -name 'Enabled' -value '0xffffffff' -PropertyType 'DWord' -Force
New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.2Server' -name 'DisabledByDefault' -value 0 -PropertyType 'DWord' -Force
New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.2Client' -name 'Enabled' -value 1 -PropertyType 'DWord' -Force
New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.2Client' -name 'DisabledByDefault' -value 0 -PropertyType 'DWord' -Force
 
# Disable Multi-Protocol Unified Hello
md 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsMulti-Protocol Unified HelloServer' -Force
New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsMulti-Protocol Unified HelloServer' -name Enabled -value 0 -PropertyType 'DWord' -Force
 
# Disable PCT 1.0
md 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsPCT 1.0' -Force
md 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsPCT 1.0Server' -Force
New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsPCT 1.0Server' -name Enabled -value 0 -PropertyType 'DWord' -Force
 
# Disable SSL 2.0 (PCI Compliance)
md 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsSSL 2.0Server' -Force
New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsSSL 2.0Server' -name Enabled -value 0 -PropertyType 'DWord' -Force
 
#DO NOT USE FOR NOW
#
# WARNING: Notice I didn't turn off SSL 3.0 - the reason for this is due to the fact that, like it or not, 
# there are still people out there using Windows XP with IE 6/7. Without SSL 3.0 enabled, there would be 
# no protocol for those people to fall back on.
# Disable SSL 3.0 (PCI Compliance)
#
#md 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsSSL 3.0Server' -Force
#New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsSSL 3.0Server' -name Enabled -value 0 -PropertyType 'DWord' -Force
 
# Disable insecure ciphers
$insecureCiphers = 'NULL','RC2 40/128','RC2 56/128','RC2 128/128','RC4 40/128','RC4 56/128','RC4 64/128','DES 56/56'
Foreach ($insecureCipher in $insecureCiphers) {
  $key = (Get-Item HKLM:).OpenSubKey('SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELCiphers', $true).CreateSubKey($insecureCipher)
  $key.SetValue('Enabled', 0, 'DWord')
  $key.close()
  Write-Host "$insecureCipher has been disabled"
}
 
# Enable new secure ciphers
$insecureCiphers = 'RC4 128/128','Triple DES 168/168','AES 128/128','AES 256/256'
Foreach ($insecureCipher in $insecureCiphers) {
  $key = (Get-Item HKLM:).OpenSubKey('SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELCiphers', $true).CreateSubKey($insecureCipher)
  New-ItemProperty -path "HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELCiphers$insecureCipher" -name 'Enabled' -value '0xffffffff' -PropertyType 'DWord' -Force
  $key.close()
  Write-Host "$insecureCipher has been enabled"
}
 
# Set hashes configuration
md 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELHashesMD5' -Force
New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELHashesMD5' -name Enabled -value '0xffffffff' -PropertyType 'DWord' -Force
 
md 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELHashesSHA' -Force
New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELHashesSHA' -name Enabled -value '0xffffffff' -PropertyType 'DWord' -Force
 
# Set KeyExchangeAlgorithms configuration
md 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELKeyExchangeAlgorithmsDiffie-Hellman' -Force
New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELKeyExchangeAlgorithmsDiffie-Hellman' -name Enabled -value '0xffffffff' -PropertyType 'DWord' -Force
 
md 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELKeyExchangeAlgorithmsPKCS' -Force
New-ItemProperty -path 'HKLM:SYSTEMCurrentControlSetControlSecurityProvidersSCHANNELKeyExchangeAlgorithmsPKCS' -name Enabled -value '0xffffffff' -PropertyType 'DWord' -Force
 
# Set cipher suites order as secure as possible (Enables Perfect Forward Secrecy)
New-ItemProperty -path 'HKLM:SOFTWAREPoliciesMicrosoftCryptographyConfigurationSSL�0010002' -name 'Functions' -value 'TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P521,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA_P521,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA_P384,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA_P256,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P521,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA_P521,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P384,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA_P384,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA_P256,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384_P521,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384_P384,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256_P521,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256_P384,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256_P256,TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384_P521,TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384_P384,TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA_P521,TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA_P384,TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA_P256,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256_P521,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256_P384,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256_P256,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA_P521,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA_P384,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA_P256,TLS_DHE_DSS_WITH_AES_256_CBC_SHA256,TLS_DHE_DSS_WITH_AES_256_CBC_SHA,TLS_DHE_DSS_WITH_AES_128_CBC_SHA256,TLS_DHE_DSS_WITH_AES_128_CBC_SHA,TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA,TLS_RSA_WITH_AES_256_CBC_SHA256,TLS_RSA_WITH_AES_256_CBC_SHA,TLS_RSA_WITH_AES_128_CBC_SHA256,TLS_RSA_WITH_AES_128_CBC_SHA,TLS_RSA_WITH_RC4_128_SHA,TLS_RSA_WITH_3DES_EDE_CBC_SHA' -PropertyType 'String' -Force
 
 
Write-Host 'After the system has been rebooted you can verify your server configuration at https://www.ssllabs.com/ssltest/'
Write-Host -ForegroundColor Red 'A computer restart is required to apply settings. Restart computer now?'
Restart-Computer -Force -Confirm

[창업일지] 폐업신고

[원문보기]

사업자등록증 원본을 들고가서, 폐업신고서와 함께 제출하면 끝!

뭐야.. 별거 아니잖아...

잠깐 실업급여나 신청해 볼까.. 음... 좀 더 알아보고....

[POODLE] SSLv3 Disable 적용 전, 후

[원문보기]

여러 환경에서 취약성을 비교해 볼 수 있는 화면이다.

SSLv3 disable 적용 전, 후를 확실히 확인 가능하다.

https://www.digicert.com/ssl-support/iis-disabling-ssl-v3.htm

IIS의 경우 reg를 제공하므로 쉽게 적용 가능하지만, 재부팅이 필요하다.

[R] 도커를 이용한 가상 크롬으로 우분투에서 RSelenium 사용

[원문보기]

윈도우에서만 가능할 것으로 여겨졌던 크롤링이 우분투를 이용해서 가능하다.

https://lareale.tistory.com/292

위를 참조하여 도커에 크롬이 설치된 컨테이너 서버를 설치하고, 실행시킨다.

13 wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add - $ sudo sh -c 'echo "deb http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google-chrome.list'

14 wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add -

15 sudo sh -c 'echo "deb http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google-chrome.list'

16 ls

17 sudo apt-get update

18 sudo apt-get install google-chrome-stable

19 wget -N http://chromedriver.storage.googleapis.com/2.10/chromedriver_linux64.zip -P ~/Downloads

21 sudo apt-get install unzip

22 unzip ~/Downloads/chromedriver_linux64.zip

59 sudo ln -s /usr/local/share/chromedriver /usr/local/bin/chromedriver

60 sudo ln -s /usr/local/share/chromedriver /usr/bin/chromedriver

68 sudo apt-get install libcurl

69 sudo apt-get install libcurl4-openssl-dev

70 sudo apt-get install libssl-dev

71 sudo apt-get install libxml2-dev

72 sudo apt-get install xml2

73 sudo R

74 sudo echo "deb http://cran.rstudio.com/bin/linux/ubuntu xenial/" | sudo tee -a /etc/apt/sources.list

75 gpg --keyserver keyserver.ubuntu.com --recv-key E084DAB9

76 gpg -a --export E084DAB9 | sudo apt-key add -

77 sudo apt-get update

78 sudo apt-get install r-base r-base-dev

79 R --version

$ sudo docker run -p 4445:4444 selenium/standalone-chrome &

아래 소스는 아직 테스트하지 못했고, aws t2.micro 에서 안된다.

(용량 문제로 dplyr 패키지를 설치할 수 없다.)

https://hjpco.wordpress.com/2017/05/31/aws-r%EC%97%90-devtools-package-%EC%84%A4%EC%B9%98%ED%95%98%EA%B8%B0/

테스트 한 것은 cvs로 만드는 소스가 테스트 되었고, 최신순 선택은 실패했다.

MS 윈도우 서버가 정지되는 바람에 시도하게 되었는데, 결국 성공하지 못하여 아래 소스를 위해 되살렸다.(정지된 구독을 종량제로 전환하기 위해 영어로 통화를 26분이나 하였다. T.T)

library(rvest)

library(RSelenium)

library(httr)

library(stringr)

library(googlesheets)

library(tidyverse)

ch=wdman::chrome(port=4445L) #크롬드라이버를 포트

remDr <- remoteDriver(remoteServerAddr = "localhost", port = 4445L, browserName = "chrome")

remDr$open() #크롬 Open

remDr$navigate("https://play.google.com/store/apps/details?id=패키지명&showAllReviews=true&hl=ko") #설정 URL로 이동(한국 스토어 기준으로 하려면 반드시 &hl=ko를 해야한다. 그렇지 않으면 &hl=en 으로 기본 설정되어 서버 IP에 해당하는 국가 리뷰가 나온다)

webElemButton <- remDr$findElements(using = "xpath", "/html/body/div[1]/div[4]/c-wiz/div/div[2]/div/div[1]/div/div/div[1]/div[2]/c-wiz/div[1]/div/div[1]/div[2]/span")

remDr$mouseMoveToLocation(webElement = webElemButton[[1]]) #정렬 방법 리스트 확장

remDr$click()

Sys.sleep(10)

webElemButton <- remDr$findElements(using = "xpath", "/html/body/div[1]/div[4]/c-wiz/div/div[2]/div/div[1]/div/div/div[1]/div[2]/c-wiz/div[1]/div/div[2]/div[1]")

remDr$mouseMoveToLocation(webElement = webElemButton[[1]]) #최신순 선택

remDr$click()

Sys.sleep(10)

frontPage <- remDr$getPageSource() #페이지 전체 소스 가져오기

reviewNames <- read_html(frontPage[[1]]) %>% html_nodes('.bAhLNe.kx8XBd') %>% html_nodes('.X43Kjb') %>% html_text() #페이지 전체 소스에서 리뷰 정보(이름, 날짜) 부분 추출하기

reviewDates <- read_html(frontPage[[1]]) %>% html_nodes('.bAhLNe.kx8XBd') %>% html_nodes('.p2TkOb') %>% html_text() #페이지 전체 소스에서 리뷰 정보(이름, 날짜) 부분 추출하기

reviewComments <- read_html(frontPage[[1]]) %>% html_nodes('.UD7Dzf') %>% html_text() #페이지 전체 소스에서 리뷰 정보(이름, 날짜) 부분 추출하기

reviewData <- data.frame(name=reviewNames, date=reviewDates, comment=reviewComments)

df_new <- gs_new(title = "패키지명",

input = reviewData,

trim = TRUE)

remDr$close()

[R] 우분투 16.04에 RStudio 설치

[원문보기]

아마존 t2.micro에 RStudio를 설치해서 원격으로 접속해 본다.

터미널보다 실행 속도가 더 빠르다니 의아하다.

http://download2.rstudio.org/ 에서 rstudio-server-1.1.463을 설치했다.

http://infondgndg91.blogspot.com/2016/09/1604-lts-rstudio.html 등에서는 rstudio-0.99.896-amd64.deb 를 받으라고 하는데,

Package 'libssl0.9.8' has no installation candidate 에러가 발생하여 상위 버전으로 설치했다.

422 wget http://download2.rstudio.org/rstudio-server-1.1.463-amd64.deb

423 sudo gdebi rstudio-server-1.1.463-amd64.deb

이상 없으면 아래와 같이 출력되며, 자동 실행된다.

Reading package lists... Done

Building dependency tree

Reading state information... Done

This package is uninstallable

Wrong architecture 'i386'

ubuntu@ip-172-31-29-250:~$ wget http://download2.rstudio.org/rstudio-server-1.1.463-amd64.deb

--2019-04-10 00:12:20-- http://download2.rstudio.org/rstudio-server-1.1.463-amd64.deb

Resolving download2.rstudio.org (download2.rstudio.org)... 54.239.186.77, 54.239.186.152, 54.239.186.198, ...

Connecting to download2.rstudio.org (download2.rstudio.org)|54.239.186.77|:80... connected.

HTTP request sent, awaiting response... 200 OK

Length: 63566904 (61M) [application/x-deb]

Saving to: ‘rstudio-server-1.1.463-amd64.deb’

rstudio-server-1.1.463-amd64.deb 100%[=============================================================================>] 60.62M 13.8MB/s in 5.6s

2019-04-10 00:12:26 (10.7 MB/s) - ‘rstudio-server-1.1.463-amd64.deb’ saved [63566904/63566904]

ubuntu@ip-172-31-29-250:~$ sudo gdebi rstudio-server-1.1.463-amd64.deb

Reading package lists... Done

Building dependency tree

Reading state information... Done

RStudio Server

RStudio is a set of integrated tools designed to help you be more productive with R. It includes a console, syntax-highlighting editor that supports direct code execution, as well as tools for plotting, history, and workspace management.

Do you want to install the software package? [y/N]:y

Selecting previously unselected package rstudio-server.

(Reading database ... 106368 files and directories currently installed.)

Preparing to unpack rstudio-server-1.1.463-amd64.deb ...

Unpacking rstudio-server (1.1.463) ...

Setting up rstudio-server (1.1.463) ...

groupadd: group 'rstudio-server' already exists

rsession: no process found

Created symlink from /etc/systemd/system/multi-user.target.wants/rstudio-server.service to /etc/systemd/system/rstudio-server.service.

● rstudio-server.service - RStudio Server

Loaded: loaded (/etc/systemd/system/rstudio-server.service; enabled; vendor preset: enabled)

Active: active (running) since Wed 2019-04-10 00:12:41 UTC; 1s ago

Process: 25430 ExecStart=/usr/lib/rstudio-server/bin/rserver (code=exited, status=0/SUCCESS)

Main PID: 25434 (rserver)

Tasks: 3

Memory: 14.3M

CPU: 387ms

CGroup: /system.slice/rstudio-server.service

└─25434 /usr/lib/rstudio-server/bin/rserver

Apr 10 00:12:41 ip-172-31-29-250 systemd[1]: Starting RStudio Server...

Apr 10 00:12:41 ip-172-31-29-250 systemd[1]: Started RStudio Server.

8787 포트를 방화벽에서 허용하여 접속하면, 윈도우에 설치한 RStudio와 동일하게 사용가능 하다.

Hamming Window Amplitude Response

[원문보기]

% Chapter 7: Hamming Window Amplitude Response

M = 45; alpha = (M-1)/2;

n = -alpha:alpha;

w = (hamming(M))'; sumw = sum(w);

N = 1000; omega = (2*pi/N)*[-N/2:N/2];

Wr = real(w*(exp(-j*n'*omega)));

db = 20*log10(abs(Wr)/max(Wr));

IntWr = cumsum(Wr);

Intdb = 20*log10(abs(IntWr)/N);

k = (N/2+1) - min(find(Intdb > -53));

tr_width = 2*k*2*M/N, %actual transition width in pi/M units

omega1 = -(tr_width/2)/M; omega2 = (tr_width/2)/M;

% plots

subplot(1,1,1)

subplot(2,2,1); stem(n,w);

axis([-(alpha+8),(alpha+8),-0.1,1.1]);

set(gca,'YTickMode','manual','YTick',[0,1])

set(gca,'XTickMode','manual','XTick',[-22,0,22]);

title('Hamming Window : M=45')

xlabel('n'); ylabel('w(n)')

subplot(2,2,3); plot(omega/pi,Wr);

axis([-1,1,-2,sumw+5]);

set(gca,'YTickMode','manual','YTick',[0,sumw])

set(gca,'XTickMode','manual','XTick',[-1,0,1]); grid

set(gca,'XTickLabelMode','manual','XTickLabels',[' 0';'22';'45']);

title('Amplitude Response')

xlabel('frequency in pi units'); ylabel('Wr')

subplot(2,2,2); plot(omega/pi,db);

axis([-1,1,-60,10]);

set(gca,'YTickMode','manual','YTick',[-60,-42,0])

set(gca,'YTickLabelMode','manual','YTickLabels',['60';'43';' 0'])

set(gca,'XTickMode','manual','XTick',[-1,0,1]);grid

title('Amplitude Response in dB')

xlabel('frequency in pi units'); ylabel('Decibels')

subplot(2,2,4); plot(omega/pi,Intdb);

axis([-1,1,-70,10]);

set(gca,'YTickMode','manual','YTick',[-70,-54,0])

set(gca,'YTickLabelMode','manual','YTickLabels',['70';'54';' 0'])

set(gca,'XTickMode','manual','XTick',[-1;omega1;omega2;1]);grid

set(gca,'XTickLabelMode','manual','XTickLabels',['-1';' ';' ';' 1'])

title('Accumulated Amplitude Response')

xlabel('frequency in pi units'); ylabel('Decibels')

text(omega2,5,'Width=(6.6)*pi/M')

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