EDIT: I've filed a bug report for this on Microsoft's Uservoice here: https://windowsserver.uservoice.com/forums/301869-powershell/suggestions/16809403-bug-add-webconfigurationproperty-does-not-correct

EDIT2: Posted here instead: https://windowsserver.uservoice.com/forums/301869-powershell/suggestions/17044378-bug-add-webconfigurationproperty-does-not-correct (the first one I posted is in the IIS section, which seems to be abandoned).

EDIT3: Scratch that, they closed the second report. Apparently IIS cmdlet problems must go in the IIS uservoice, even if it is seemingly abandoned. Report is here: https://windowsserver.uservoice.com/forums/301869-powershell/suggestions/16809403-bug-add-webconfigurationproperty-does-not-correct

Alright, I have a solid half day into this, and can't get it work quite right. Some of the IIS cmdlets feel very.. un-powershell. I'd consider myself pretty damned decent with PS, and this is baffling me. Help me /r/PowerShell!

SETUP:

• Server 2012 R2
• IIS installed with WebDAV Publishing (this is located under IIS -> Web Server -> Common HTTP Features)
• Two virtual directories set up under the default website:
  • TestShare2
  • TestShare3

These virtual directories are being set up via PowerShell like this:

$shareName = 'TestShare2'
$createdFolder = New-Item -Path "C:\sharetest\$shareName" -ItemType Directory
New-WebVirtualDirectory -Name $shareName -PhysicalPath $createdFolder.FullName -Site 'Default Web Site'

GOALS:

• Set WebDAV authoring rule on the two virtual directories to the following settings
  • Users - *
  • Path - *
  • Access - Read, Write, Source
• It should look like this in the GUI

• It should look like this in the configuration file (which is located at C:\Windows\System32\Inetsrv\Config\applicationHost.config):

  <location path="Default Web Site/TestShare2">
      <system.webServer>
          <webdav>
              <authoringRules>
                  <add users="*" path="*" access="Read, Write, Source" />
              </authoringRules>
          </webdav>
      </system.webServer>
  </location>
  

WHAT I'M GETTING:

• This is what I'm seeing in the GUI (just read access)

• This is what I'm seeing in the configuration file:

  <location path="Default Web Site/TestShare3">
      <system.webServer>
          <webdav>
              <authoringRules>
                  <add users="*" path="*" /> (** NOTE MISSING "access" PROPERTY **)
              </authoringRules>
          </webdav>
      </system.webServer>
  </location>
  

For some reason, it's not including the "access" portion of the configuration, and I have no idea why.

WHAT I'M TRYING TO USE:

Documentation on some of these IIS cmdlets is a bit lacking, but this is what I've gathered:

$filter = '/system.webServer/webdav/authoringRules' 
$location = 'Default Web Site/TestShare3'
$accessRule = @{
  users  = '*'
  path   = '*'
  access = 'Read, Write, Source'
}

Add-WebConfigurationProperty -Filter $filter -Location $location -Name '.' -Value $accessRule -Verbose

EDIT - NON-POWERSHELL SOLUTION

Well, I worked with the guys in the PowerShell slack/IRC, and none of us could get this to work. The general consensus is that there is a bug in the IIS module.

I ended up doing this via appcmd:

appcmd.exe set config "Default Web Site/TestShare3" -section:system.webServer/webdav/authoringRules / "[roles='*',path='*',access='Read, Write, Source']" /commit:apphost