密码的字符串操作

Question

日安，

我正在尝试创建用户启动日期的默认密码库。例如，如果用户启动"11/10/2018"，密码应该是"Sep10th2018!“

这就是我所拥有的。它“有效”，但我相信应该有更好的方法来做到这一点。我只是不知道怎么做。以防万一，这不是什么问题。更多的是为了学习。我想在PowerShell做得更好。

#   Generate Default Password
IF ($StartDate[0] -eq "0" -and $StartDate[1] -eq "1") {
    $Month = "Jan"
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "1") {$Day = "1st"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "2") {$Day = "2nd"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "3") {$Day = "3rd"} 
    Else {$Day = @($StartDate[3] + $StartDate[4] + "th")}
    $Year = @("20" + $StartDate[8] + $StartDate[9] + "!")
}
IF ($StartDate[0] -eq "0" -and $StartDate[1] -eq "2") {
    $Month = "Feb"
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "1") {$Day = "1st"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "2") {$Day = "2nd"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "3") {$Day = "3rd"} 
    Else {$Day = @($StartDate[3] + $StartDate[4] + "th")}
    $Year = @("20" + $StartDate[8] + $StartDate[9] + "!")
}    
IF ($StartDate[0] -eq "0" -and $StartDate[1] -eq "3") {
    $Month = "Mar"
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "1") {$Day = "1st"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "2") {$Day = "2nd"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "3") {$Day = "3rd"} 
    Else {$Day = @($StartDate[3] + $StartDate[4] + "th")}
    $Year = @("20" + $StartDate[8] + $StartDate[9] + "!")
}    
IF ($StartDate[0] -eq "0" -and $StartDate[1] -eq "4") {
    $Month = "Apr"
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "1") {$Day = "1st"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "2") {$Day = "2nd"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "3") {$Day = "3rd"} 
    Else {$Day = @($StartDate[3] + $StartDate[4] + "th")}
    $Year = @("20" + $StartDate[8] + $StartDate[9] + "!")
}    
IF ($StartDate[0] -eq "0" -and $StartDate[1] -eq "5") {
    $Month = "May"
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "1") {$Day = "1st"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "2") {$Day = "2nd"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "3") {$Day = "3rd"} 
    Else {$Day = @($StartDate[3] + $StartDate[4] + "th")}
    $Year = @("20" + $StartDate[8] + $StartDate[9] + "!")
}    
IF ($StartDate[0] -eq "0" -and $StartDate[1] -eq "6") {
    $Month = "Jun"
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "1") {$Day = "1st"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "2") {$Day = "2nd"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "3") {$Day = "3rd"} 
    Else {$Day = @($StartDate[3] + $StartDate[4] + "th")}
    $Year = @("20" + $StartDate[8] + $StartDate[9] + "!")
}    
IF ($StartDate[0] -eq "0" -and $StartDate[1] -eq "7") {
    $Month = "Jul"
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "1") {$Day = "1st"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "2") {$Day = "2nd"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "3") {$Day = "3rd"} 
    Else {$Day = @($StartDate[3] + $StartDate[4] + "th")}
    $Year = @("20" + $StartDate[8] + $StartDate[9] + "!")
}    
IF ($StartDate[0] -eq "0" -and $StartDate[1] -eq "8") {
    $Month = "Aug"
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "1") {$Day = "1st"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "2") {$Day = "2nd"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "3") {$Day = "3rd"} 
    Else {$Day = @($StartDate[3] + $StartDate[4] + "th")}
    $Year = @("20" + $StartDate[8] + $StartDate[9] + "!")
}    
IF ($StartDate[0] -eq "0" -and $StartDate[1] -eq "9") {
    $Month = "Sep"
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "1") {$Day = "1st"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "2") {$Day = "2nd"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "3") {$Day = "3rd"} 
    Else {$Day = @($StartDate[3] + $StartDate[4] + "th")}
    $Year = @("20" + $StartDate[8] + $StartDate[9] + "!")
}    
IF ($StartDate[0] -eq "1" -and $StartDate[1] -eq "0") {
    $Month = "Oct"
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "1") {$Day = "1st"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "2") {$Day = "2nd"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "3") {$Day = "3rd"} 
    Else {$Day = @($StartDate[3] + $StartDate[4] + "th")}
    $Year = @("20" + $StartDate[8] + $StartDate[9] + "!")
}    
IF ($StartDate[0] -eq "1" -and $StartDate[1] -eq "1") {
    $Month = "Nov"
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "1") {$Day = "1st"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "2") {$Day = "2nd"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "3") {$Day = "3rd"} 
    Else {$Day = @($StartDate[3] + $StartDate[4] + "th")}
    $Year = @("20" + $StartDate[8] + $StartDate[9] + "!")
}   
IF ($StartDate[0] -eq "1" -and $StartDate[1] -eq "2") {
    $Month = "Dec"
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "1") {$Day = "1st"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "2") {$Day = "2nd"}
    IF ($StartDate[3] -eq "0" -eq $StartDate[4] -eq "3") {$Day = "3rd"} 
    Else {$Day = @($StartDate[3] + $StartDate[4] + "th")}
    $Year = @("20" + $StartDate[8] + $StartDate[9] + "!")
}

[string]$password2 = @($Month + $Day + $Year)
$password = $password2 | ConvertTo-SecureString -AsPlainText -Force
$password 

Answer 1

使用regex获取日期后缀，使用格式运算符构建密码：

function Get-DateSuffix([datetime]$Date) {
    switch -regex ($Date.Day.ToString()) {
        '1(1|2|3)$' { 'th'; break }
        '.?1$'      { 'st'}
        '.?2$'      { 'nd'}
        '.?3$'      { 'rd'}
        default     { 'th'}
    }
}

[datetime]$StartDate = "11/10/2018"

$password = "{0:MMM}{1}{2}{3}!" -f $StartDate, $StartDate.Day, (Get-DateSuffix $StartDate), $StartDate.Year

Answer 2

重新使用优雅的C#解决方案这里，您可以在PowerShell中这样做：

    function Get-DaySuffix($day)
    {
        switch ($day)
        {
            {$day -in (1,21,31)} {"st" }
            {$day -in (2,22)} { "nd" }
            {$day -in (3,23)} { "rd" }
            default { "th" }
        }
    }

    # Change to some other means of getting date - e.g. Read-Host
    $startDate = Get-Date "23/05/2007"

    # Get a collection of the month names (e.g. Jan, Feb, mar, etc)
    $months = [System.Globalization.CultureInfo]::CurrentCulture.DateTimeFormat.AbbreviatedMonthNames

    # Build the password from the date parts
    $password = "$($months[$startDate.Month-1])$($startDate.Day)$(Get-DaySuffix $startDate.Day)$($startDate.Year)!"

在本例中，$password设置为May23rd2007!。

Answer 3

免责声明:您可能已经知道了，但是我必须声明这是一个非常糟糕的密码，如果您可以这样称呼的话

大部分内容都可以卸载到类型中，除了月份的序号后缀。

我会把它分解成三个步骤：

1. 解析输入日期
2. 生成前半部分
3. 计算后缀
4. 附加年份

# Parse the input date
$inputDate = Read-Host "Input date in the format MM/dd/yyyy"
$date = [datetime]::ParseExact($inputDate,'MM/dd/yyyy',$null)

# Generate first half 
$dateString = $date.ToString('MMMdd')

# Calculate the ordinal suffix
$day = $date.Day
if($day -in 1,21,31) {
    $dateString += 'st'
}
else if($day -in 2,22) {
    $dateString += 'nd'
}
else if($day -in 3,23) {
    $dateString += 'rd'
}
else {
    $dateString += 'th'
}

# Append the year:
$dateString += $date.ToString('yyyy!')