如何通过目录树递归使用PowerShell

Question

查找文件现在，你扔出去找-ChildItem -Recurse的超级简单的答案之前，这是我唯一的问题：

我远程连接使用PowerShell到Azure ，抓取站点（槽）列表，然后遍历站点并使用Kudu API查找目录结构中的所有图像。由于Kudu没有递归的概念，我必须构建自己的递归函数来抓取根目录中的所有图像，然后遍历所有儿童和孩子的孩子等，以便在这些目录中找到图像文件。

这里是我连接到Azure和抓根目录代码：

function Get-AzureRmWebAppPublishingCredentials($resourceGroupName, $webAppName, $slotName = $null){ 
    if ([string]::IsNullOrWhiteSpace($slotName)){ 
     $resourceType = "Microsoft.Web/sites/config" 
     $resourceName = "$webAppName/publishingcredentials" 
    } 
    else{ 
     $resourceType = "Microsoft.Web/sites/slots/config" 
     $resourceName = "$webAppName/$slotName/publishingcredentials" 
    } 
    $publishingCredentials = Invoke-AzureRmResourceAction -ResourceGroupName $resourceGroupName -ResourceType $resourceType -ResourceName $resourceName -Action list -ApiVersion 2015-08-01 -Force 
     return $publishingCredentials 
} 


function Get-KuduApiAuthorisationHeaderValue($resourceGroupName, $webAppName, $slotName = $null){ 
    $publishingCredentials = Get-AzureRmWebAppPublishingCredentials $resourceGroupName $webAppName $slotName 
    return ("Basic {0}" -f [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes(("{0}:{1}" -f $publishingCredentials.Properties.PublishingUserName, $publishingCredentials.Properties.PublishingPassword)))) 
} 

function Fill-MimeTypes(){ 
    return @("image/gif", "image/x-icon", "image/jpeg", "image/png", "image/tiff", "image/bmp") 
} 

$MimeTypes = Fill-MimeTypes 
[System.Collections.ArrayList]$Directories = @() 


#Login to Azure Account 
Login-AzureRmAccount 

#Get the Azure subscription 
Select-AzureRmSubscription -SubscriptionName [Subscription Name] 

#Get the resource group name 
$resourceGroupName = [Resource Group Name] 

#Get the WebApp name 
$Resources = Find-AzureRmResource -ResourceType Microsoft.Web/sites -ResourceGroupNameContains $resourceGroupName 

ForEach($Resource in $Resources) 
{ 
    #Get the WebAppName 
    $WebAppName = $Resource.Name 

    #Now, get the publishing creds 
    $publishingCredentialsHeader = Get-KuduApiAuthorisationHeaderValue $resourceGroupName $WebAppName $null 
    $ApiUrl = "https://$WebAppName.scm.azurewebsites.net/api/vfs/site/wwwroot/" 

    #Now get the list of files in the wwwroot directory 
    $InitialList = Invoke-RestMethod -Uri $ApiUrl -Headers @{Authorization=$publishingCredentialsHeader} -Method GET -ContentType "application/json" 

    ForEach($Item in $InitialList) 
    { 
     If($MimeTypes -Contains $Item.mime)  
     { 
      #Add image file data to a collection 
     } 

     If ($Item.mime -eq "inode/directory") 
     { 
      #So, here is where I need to recurse... 
      #The mime type of inode/directory means it's a directory ;) 
      #I now need to call the Api again with the Url and get the contents of the current directory and rinse and repeat until done 
      #But I cannot forget about the other directories in the root directory and their children. 
     } 
    } 
} 

如何我写的递归函数？

Answer 1

我会写它如下。有些是伪代码，因为我不是PS的语法或关键字精通：

function Collect-Files($apiUrl, $creds, $currentDir) 
{ 
    $list = Invoke-RestMethod -Uri $apiUrl/$currentDir/ -Headers @{Authorization=$creds} -Method GET -ContentType "application/json" 

    If($MATCHLIST -eq $null) 
    { 
     $MATCHLIST = @() #initialize array 
    } 


    ForEach($Item in $list) 
    { 
     If($MimeTypes -Contains $Item.mime)  
     { 
      #Add image file data to a collection 
      $MATCHLIST += $Item #add to array 
     } 

     If ($Item.mime -eq "inode/directory") 
     { 
      $nextDir = $Item.name 
      $MATCHLIST = Collect-Files $apiUrl $creds $currentDir/$nextDir 
     } 
    } 

    return ($MATCHLIST) 
} 

然后，如下以前的代码调用该函数：

#Get the WebApp name 
$Resources = Find-AzureRmResource -ResourceType Microsoft.Web/sites -ResourceGroupNameContains "Nav-Inventory" 

ForEach($Resource in $Resources) 
{ 
    #Get the WebAppName 
    $WebAppName = $Resource.Name 

    #Now, get the publishing creds 
    $publishingCredentialsHeader = Get-KuduApiAuthorisationHeaderValue $resourceGroupName $WebAppName $null 
    $ApiUrl = "https://$WebAppName.scm.azurewebsites.net/api/vfs/site/" 

    #Now get the list of files in the wwwroot directory 
    $InitialList = Invoke-RestMethod -Uri $ApiUrl -Headers @{Authorization=$publishingCredentialsHeader} -Method GET -ContentType "application/json" 

    $MATCHES += Collect-Files $ApiUrl $publishingCredentialsHeader "wwwroot" 
} 

基本递归。