Author Archives: cowman.chiang

CSS: Center text (horizontally and vertically)

Posted on 2024 年 01 月 29 日 by cowman.chiang

<html>

<head>
    <meta charset="UTF-8">
    <title>404 Error Page</title>
    <style>
        .parent{
          width: 100%;
          height: 30%;
          margin-bottom: 50px;
          
          text-align: center; 
        }

        .text-parent:before {
          content: "";
          display: inline-block;
          height: 100%;
          vertical-align: middle;
        }        
    </style>
</head>

<body>
    <div class="parent text-parent">
        <h1> 404 </h1>
    <hr>
        <h3>此活動不存在</h3>
    </div>
</body>

</html>

<html>

<head>

<title>404 Error Page</title>

<style>

.parent{

width: 100%;

height: 30%;

margin-bottom: 50px;

text-align: center;

}

.text-parent:before {

content: "";

display: inline-block;

height: 100%;

vertical-align: middle;

}

</style>

</head>

<body>

<hr>

<h3>此活動不存在</h3>

</div>

</body>

</html>

Ref.: iThome: 29. CSS 水平置中/ 垂直置中的方法

Posted in CSS, HTML | Comments Off

Mac OS X upgrade cURL with SSL support

Posted on 2023 年 11 月 16 日 by cowman.chiang

┌─Cowman@CLOUD-42:~/Downloads/20160511 └──$ sh curl.sh guList curl: (1) Protocol “‘https” not supported or disabled in libcurl ┌─Cowman@CLOUD-42:~/Downloads/20160511 └──$ brew install curl –with-nghttp2 ==> Installing dependencies for curl: openssl, pkg-config, libev, libevent, jansson, boost, libxml2, spdylay, nghttp2 ….

Posted in Mac | Leave a comment

Delete snapshots older than 7 days

Posted on 2023 年 11 月 16 日 by cowman.chiang

To avoid running out of disk space in our test environment, we developed a plan to regularly execute shell scripts to clean up unnecessary snapshots.

#!/bin/bash

week=`date --date='7 days ago' +'%Y%m%d'`
echo "list_snapshots" | /home/webuser/hbase-1.2.9/bin/hbase shell | grep "pattern " | \
while read CMD; do
    filename=($CMD)
#    echo $filename
    date=`echo $filename | awk -F "_" '{print $2}'`
#    echo  "${filename#*_}"
#    echo $date
#    echo ${date:0:8}
    if [ "${date:0:8}" -lt $week ]
    then
        echo "delete_snapshot '$filename'" | /home/webuser/hbase-1.2.9/bin/hbase shell
    fi
done

#!/bin/bash

week=`date --date='7 days ago' +'%Y%m%d'`

echo "list_snapshots" | /home/webuser/hbase-1.2.9/bin/hbase shell | grep "pattern " | \

while read CMD; do

filename=($CMD)

# echo $filename

date=`echo $filename | awk -F "_" '{print $2}'`

# echo "${filename#*_}"

# echo $date

# echo ${date:0:8}

if [ "${date:0:8}" -lt $week ]

then

echo "delete_snapshot '$filename'" | /home/webuser/hbase-1.2.9/bin/hbase shell

done

Posted in HBase, Shell Script | Comments Off

Continuously print the file content

Posted on 2023 年 10 月 25 日 by cowman.chiang

Use the command ‘tail’ to print the file contents, starting from the beginning of the file and print new contents continuously.

tail +1f 'file'

1 2	tail +1f 'file'

Posted in Linux | Comments Off

HBase Client 2.5.5 in JDK 11

Posted on 2023 年 10 月 02 日 by cowman.chiang

Because of the vulnerability scan results of the project, the JDK version must be upgraded from 8 to 11 to complete the repair. The original HBase Client version 1.2 we used was incompatible with JDK 11, so we had to … Continue reading →

Posted in HBase, Java | Comments Off

AES decrypt in postman

Posted on 2023 年 05 月 31 日 by cowman.chiang

sample code:

var CryptoJS = require("crypto-js"); 
let secretKey = 'yourSecretKey'; 

function decrypt(aesStr, key) { 
    return CryptoJS.AES.decrypt( 
        aesStr, 
        CryptoJS.enc.Utf8.parse(padding(key)), 
        { 
            mode: CryptoJS.mode.ECB, 
            padding: CryptoJS.pad.Pkcs7 
        } 
    ).toString(CryptoJS.enc.Utf8) 
} 

function padding(key) { 
    return key.padEnd(32, '\0'); 
} 

//decrypt("encryptedData", secretKey)

var CryptoJS = require("crypto-js");

let secretKey = 'yourSecretKey';

function decrypt(aesStr, key) {

return CryptoJS.AES.decrypt(

aesStr,

CryptoJS.enc.Utf8.parse(padding(key)),

{

mode: CryptoJS.mode.ECB,

padding: CryptoJS.pad.Pkcs7

}

).toString(CryptoJS.enc.Utf8)

}

function padding(key) {

return key.padEnd(32, '\0');

}

//decrypt("encryptedData", secretKey)

Here we choose AES-256 to encrypt / decrypt the secure information. When using AES, the length of the secretKey is important. The length of secretKey in AES-128 is 16 bits, and in AES-256 is 32 bits. And … Continue reading →

Posted in JavaScript, Postman | Comments Off

[Java] Create CSV files with BOM

Posted on 2023 年 03 月 10 日 by cowman.chiang

public static final String UTF8_BOM = "\uFEFF";

public ByteArrayInputStream createFile(Object object) {
    try {
        CSV csv = (CSV) object;
        StringBuffer sb = new StringBuffer();
        sb.append(UTF8_BOM);

        if (csv.getHeaderList() != null) {
            sb.append(StringUtils.join(csv.getHeaderList().toArray(new String[0]), ",")).append("\n");
        }

        for (List&lt;String&gt; row : csv.getDataList()) {
            sb.append(StringUtils.join(row.toArray(new String[0]), ",")).append("\n");
        }

        return new ByteArrayInputStream(sb.toString().getBytes("UTF-8"));
    } catch (Exception e) {
        return null;
    }
}

public static final String UTF8_BOM = "\uFEFF";

public ByteArrayInputStream createFile(Object object) {

try {

CSV csv = (CSV) object;

StringBuffer sb = new StringBuffer();

sb.append(UTF8_BOM);

if (csv.getHeaderList() != null) {

sb.append(StringUtils.join(csv.getHeaderList().toArray(new String[0]), ",")).append("\n");

}

for (List<String> row : csv.getDataList()) {

sb.append(StringUtils.join(row.toArray(new String[0]), ",")).append("\n");

}

return new ByteArrayInputStream(sb.toString().getBytes("UTF-8"));

} catch (Exception e) {

return null;

}

Posted in Java | Comments Off

[Linux] pkill command

Posted on 2023 年 02 月 23 日 by cowman.chiang

I don’t know what’s going on. But we can use command “pkill” to delete those abnormal processes.

sudo pkill -f pgrep

1 2	sudo pkill -f pgrep

Reference: stackoverflow: How to kill all processes with a given partial name?

Posted in Linux | Comments Off

[Java] Google authenticator

Posted on 2023 年 02 月 22 日 by cowman.chiang

Reference: 1. Greddy’s Blogs: Google Authenticator實作 2. 菜鳥工程師肉豬: Spring Boot 使用Google身分驗證器做TOTP驗證 Google Authenticator TOTP auth

Posted in Auth, Java | Comments Off

[Java] Download file without saving

Posted on 2023 年 02 月 17 日 by cowman.chiang

Source: CSDN: InputStream类available和read方法可能读取不到完整的流数据 stackoverflow: How to read a http file inmemory without saving on local drive?

private static InputStream download(String sourceURL) throws Exception {
        InputStream inputStream = new URL(sourceURL).openStream();
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        byte[] buffer = new byte[4096];
        int n = 0;
        while (-1 != (n = inputStream.read(buffer))) {
            output.write(buffer, 0, n);
        }
        return new ByteArrayInputStream(output.toByteArray());
}

private static InputStream download(String sourceURL) throws Exception {

InputStream inputStream = new URL(sourceURL).openStream();

ByteArrayOutputStream output = new ByteArrayOutputStream();

byte[] buffer = new byte[4096];

int n = 0;

while (-1 != (n = inputStream.read(buffer))) {

output.write(buffer, 0, n);

}

return new ByteArrayInputStream(output.toByteArray());

}

Posted in Java | Comments Off

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