Fix proxy type

[condorcorde]

[PowerShell] Fix proxy type (@wing328)

The file configuration.mustache in modules/openapi-generator/src/main/resources/powershell/configuration.mustache contains the following check in the function Set-{{{apiNamePrefix}}}Configuration

If ($Proxy.GetType().FullName -ne "System.Net.SystemWebProxy" -and $Proxy.GetType().FullName -ne "System.Net.WebRequest+WebProxyWrapperOpaque") {
    throw "Incorrect Proxy type '$($Proxy.GetType().FullName)'. Must be System.Net.SystemWebProxy or System.Net.WebRequest+WebProxyWrapperOpaque."
}

The check fails in multiple environments, either because the type checked is unknown, or because the class returned by GetSystemWebProxy() is different from what is expected.

Command	Windows PS 5	Windows PS7	MacOS PS 7
$PSVersionTable	Name Value ---- ----- PSVersion 5.1.19041.4046 PSEdition Desktop PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...} BuildVersion 10.0.19041.4046 [...]	Name Value ---- ----- PSVersion 7.4.1 PSEdition Core GitCommitId 7.4.1 OS Microsoft Windows 10.0.19045 Platform Win32NT [...]	Name Value ---- ----- PSVersion 7.4.1 PSEdition Core GitCommitId 7.4.1 OS Darwin 23.4.0 Darwin Kernel Version 23.4.0: Wed Feb 21 21:44:31 PST 2024; root:xnu-1006… Platform Unix [...]
[System.Net.SystemWebProxy]$a	Unable to find type [System.Net.SystemWebProxy]. At line:1 char:2 + [System.Net.SystemWebProxy]$a + ~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (System.Net.SystemWebProxy:TypeName) [], RuntimeException + FullyQualifiedErrorId : TypeNotFound	InvalidOperation: Unable to find type [System.Net.SystemWebProxy].	InvalidOperation: Unable to find type [System.Net.SystemWebProxy].
([System.Net.WebRequest]:: GetSystemWebProxy()).GetType()	IsPublic IsSerial Name BaseType -------- -------- ---- -------- False False WebProxyWrapperOpaque System.Object	IsPublic IsSerial Name BaseType -------- -------- ---- -------- False False HttpWindowsProxy System.Object	IsPublic IsSerial Name BaseType -------- -------- ---- -------- False False MacProxy System.Object

Since all returned types implement (and by the available doc, shall implement) the interface IWebProxy, I propose to replace the above test with

If ('System.Net.IWebProxy' -notin $Proxy.GetType().ImplementedInterfaces.FullName) {
    throw "Incorrect Proxy type '$($Proxy.GetType().FullName)'. Must implement System.Net.IWebProxy interface."
}

The change does not guarantee that the configured proxy will work on all systems (e.g. on Linux the default class is HttpNoProxy, and on MacOS proxy credentials are likely not yet implemented). Yet, when using the command

Set-PSConfiguration -Proxy ([system.net.webproxy]::new('http://127.0.0.1:8080')) -SkipCertificateCheck

the request and response are intercepted as requested in the proxy, and can be used for debugging.

The test can be made by using e.g. Burp Suite Community Edition, enabling the proxy on 127.0.0.1:8080 and using the line above to configure the PowerShell PetStore client API.

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[wing328]

PS tests passed via https://ci.appveyor.com/project/WilliamCheng/openapi-generator/builds/49441588

thanks for the PR, let's give it a try