利用PowerShell一键下载Nuget某个包的所有版本_Powershell

一转眼好几年没有写博客了，来博客园冒个泡，最近由于工作需要，内网办公，幸运的是只需要上传一个*.nupkg一个包信息就可以在私有nuget下载到了，下面就用powershell编写下载脚本，需要注意的是powershell后缀ps1（最后一个数字1），以newtonsoft.json为例：

下载地址

# 设置nuget包列表的url
$packagename = "newtonsoft.json"
$targethttp = "https://www.nuget.org/packages/"
$targeturl = "{0}{1}" -f $targethttp, $packagename

保存地址

# 设置保存已下载包的目录
$outputdirectory = "d:\nuget_packages"
if (-not (test-path $outputdirectory)) {
    new-item -path $outputdirectory -itemtype directory
}

解析下载版本地址

定义下载需要解析的包地址

# 定义下载前缀
$httpprefix = "https://www.nuget.org/api/v2/package/"
# 下载html文件内容
$htmlcontent = invoke-webrequest -uri $targeturl -usebasicparsing | select-object -expandproperty content
# 匹配标签
$pattern = "<.*?>"
$matches = [regex]::matches($htmlcontent, $pattern)

获取所有a标签

foreach ($match in $matches) {
　　$tag = $match.value
　　# 获取a标签
　　if ($tag -like "<a href=*") {
　　　　write-host $tag
　　}
}

输出结果

<a href="#" rel="external nofollow" rel="external nofollow" id="skiptocontent" class="showonfocus" title="skip to content">
...
<a href="/packages/system.xml.xmldocument/" rel="external nofollow" >
<a href="/packages/newtonsoft.json/13.0.3" rel="external nofollow" rel="external nofollow" title="13.0.3">
...
<a href="/packages/newtonsoft.json/3.5.8" rel="external nofollow" rel="external nofollow" title="3.5.8">
<a href="/stats/packages/newtonsoft.json?groupby=version" rel="external nofollow" rel="external nofollow" title="package statistics">
...
<a href="/packages/newtonsoft.json/13.0.3/reportabuse" rel="external nofollow" rel="external nofollow" title="report the package as abusive">
<a href="/packages/newtonsoft.json/13.0.3/contactowners" rel="external nofollow" rel="external nofollow" title="ask the package owners a question">
...

观察上一步结果可以看出来每一个版本都有title，且title内容是版本

# 获取含有title的a标签
if ($tag -like "*title=*") {
  write-host $tag        
}

输出结果

<a href="#" rel="external nofollow" rel="external nofollow" id="skiptocontent" class="showonfocus" title="skip to content">
<a href="/packages/newtonsoft.json/13.0.3" rel="external nofollow" rel="external nofollow" title="13.0.3">
...
<a href="/packages/newtonsoft.json/3.5.8" rel="external nofollow" rel="external nofollow" title="3.5.8">
<a href="/stats/packages/newtonsoft.json?groupby=version" rel="external nofollow" rel="external nofollow" title="package statistics">
<a href="https://www.newtonsoft.com/json" rel="external nofollow" data-track="outbound-project-url" title="visit the project site to learn more about this package" >
...
<a href="/packages/newtonsoft.json/13.0.3/reportabuse" rel="external nofollow" rel="external nofollow" title="report the package as abusive">
<a href="/packages/newtonsoft.json/13.0.3/contactowners" rel="external nofollow" rel="external nofollow" title="ask the package owners a question">
<a href="/packages?q=tags%3a%22json%22" rel="external nofollow" title="search for json" class="tag">

接着上一步的结果继续过滤

# 截取href的内容
$substr = $tag.substring(9)
if ($substr -like "/packages/*") {
    write-host $substr
}

输出结果

/packages/newtonsoft.json/13.0.3" title="13.0.3">
...
/packages/newtonsoft.json/3.5.8" title="3.5.8">
/packages/newtonsoft.json/13.0.3/reportabuse" title="report the package as abusive">
/packages/newtonsoft.json/13.0.3/contactowners" title="ask the package owners a question">

有完没完，又来了？看上面的结果就还差过滤两个不相关的了，

获取href完整内容

# 查找第一个双引号的位置
$index = $substr.indexof('"')
# 获取部分/packages/newtonsoft.json/13.0.3
$substr = $substr.substring(0,$index)

剔除最后两个版本无关的a标签

# 排除报告滥用a标签
if ($substr -notlike "*/reportabuse") {
　　# 排除联系作者a标签
　　if ($substr -notlike "*/contactowners") {
　　　　# 匹配版本
　　　　$endindex = $substr.lastindexof('/')
　　　　$startpackageindex = $endindex + 1
　　　　$packageversion = $substr.substring($startpackageindex)
　　}
}

invoke-webrequest命令下载并保存文件

# 下载地址nupkg
$packageurl = "{0}{1}/{2}" -f $httpprefix,$packagename,$packageversion
# 生成保存文件的路径
$packagefile = join-path -path $outputdirectory -childpath "$packagename.$packageversion.nupkg"
# 下载 .nupkg 文件
write-host "downloading $packagename version $packageversion from $packageurl"
invoke-webrequest -uri $packageurl -outfile $packagefile

全部代码

# 设置nuget包列表的url
$packagename = "newtonsoft.json"
$targethttp = "https://www.nuget.org/packages/"
$targeturl = "{0}{1}" -f $targethttp, $packagename
# 设置保存已下载包的目录
$outputdirectory = "d:\nuget_packages"
if (-not (test-path $outputdirectory)) {
    new-item -path $outputdirectory -itemtype directory
}
# 定义下载前缀
$httpprefix = "https://www.nuget.org/api/v2/package/"
# 下载html文件内容
$htmlcontent = invoke-webrequest -uri $targeturl -usebasicparsing | select-object -expandproperty content
# 匹配标签
$pattern = "<.*?>"
$matches = [regex]::matches($htmlcontent, $pattern)
foreach ($match in $matches) {
    $tag = $match.value
        # 获取a标签
        if ($tag -like "<a href=*") {
            # 获取含有title的a标签
            if ($tag -like "*title=*")
            {
                # 截取href的内容
                $substr = $tag.substring(9)
                if ($substr -like "/packages/*")
                {
                    # 查找第一个双引号的位置
                    $index = $substr.indexof('"')
                    # 获取部分/packages/newtonsoft.json/13.0.3
                    $substr = $substr.substring(0,$index)
                    # 排除报告滥用a标签
                    if ($substr -notlike "*/reportabuse")
                    {
                        # 排除联系作者a标签
                        if ($substr -notlike "*/contactowners")
                        {
                            # 匹配版本
                            $endindex = $substr.lastindexof('/')
                            $startpackageindex = $endindex + 1
                            $packageversion = $substr.substring($startpackageindex)
                            # 下载地址nupkg
                            $packageurl = "{0}{1}/{2}" -f $httpprefix,$packagename,$packageversion
                            # 生成保存文件的路径
                            $packagefile = join-path -path $outputdirectory -childpath "$packagename.$packageversion.nupkg"
                            # 下载 .nupkg 文件
                            write-host "downloading $packagename version $packageversion from $packageurl"
              invoke-webrequest -uri $packageurl -outfile $packagefile
                            
                        }
                        
                    }
                    
                }
                
            }
            
        }
}
# 执行结束暂停
$null = read-host

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