Framework/Helpers/WebRequestHelper.ps1

Set-StrictMode -Version Latest 
class WebRequestHelper {
   
    hidden static [string] $AzureManagementUri = "https://management.azure.com/";
    hidden static [string] $GraphApiUri = "https://graph.windows.net/";
    hidden static [string] $ClassicManagementUri = "https://management.core.windows.net/";

    static [System.Object[]] InvokeGetWebRequest([string] $uri, [Hashtable] $headers) 
    {
        return [WebRequestHelper]::InvokeWebRequest([Microsoft.PowerShell.Commands.WebRequestMethod]::Get, $uri, $headers, $null);
    }

    static [System.Object[]] InvokeGetWebRequest([string] $uri) 
    {    
        return [WebRequestHelper]::InvokeGetWebRequest($uri, [WebRequestHelper]::GetAuthHeaderFromUri($uri));
    }
    
    hidden static [string] GetApplicationInsightsEndPoint()
    {
        $rmContext = [ContextHelper]::GetCurrentContext();
        $azureEnv= $rmContext.Environment.Name 
        if($azureEnv -eq "AzureUSGovernment")
        {
            return "https://dc.applicationinsights.us/v2/track"
        }
        elseif ($azureEnv -eq "AzureChinaCloud" ) {
            return "https://dc.applicationinsights.azure.cn/v2/track"
        }
        else {
            return "https://dc.services.visualstudio.com/v2/track"
        }
    }

    hidden static [string] GetLADataCollectorAPI()
    {
        $rmContext = [ContextHelper]::GetCurrentContext();
        $azureEnv= $rmContext.Environment.Name 
        if($azureEnv -eq "AzureUSGovernment")
        {
            return ".ods.opinsights.azure.us"
        }
        elseif ($azureEnv -eq "AzureChinaCloud" ) {
            return ".ods.opinsights.azure.cn"
        }
        else {
            return ".ods.opinsights.azure.com"
        }
    }

    hidden static [string] GetGraphUrl()
    {
        $rmContext = [ContextHelper]::GetCurrentContext();
        $azureEnv= $rmContext.Environment.Name 
        if(-not [string]::IsNullOrWhiteSpace($azureEnv) -and ($azureEnv -ne [Constants]::DefaultAzureEnvironment))
        {
        return [ContextHelper]::GetCurrentContext().Environment.GraphUrl
        }
        return "https://graph.windows.net/"
    }

    hidden static [string] GetResourceManagerUrl()
    {
        $rmContext = [ContextHelper]::GetCurrentContext();
        $azureEnv= $rmContext.Environment.Name 
        if(-not [string]::IsNullOrWhiteSpace($azureEnv) -and ($azureEnv -ne [Constants]::DefaultAzureEnvironment))
        {
        return [ContextHelper]::GetCurrentContext().Environment.ResourceManagerUrl
        }
        return "https://management.azure.com/"
    }

    hidden static [string] GetServiceManagementUrl()
    {
        $rmContext = [ContextHelper]::GetCurrentContext();
        $azureEnv= $rmContext.Environment.Name 
        if(-not [string]::IsNullOrWhiteSpace($azureEnv) -and ($azureEnv -ne [Constants]::DefaultAzureEnvironment))
        {
        return [ContextHelper]::GetCurrentContext().Environment.ServiceManagementUrl
        }
        return "https://management.core.windows.net/"
    }

    hidden static [Hashtable] GetAuthHeaderFromUri([string] $uri)
    {
        [System.Uri] $validatedUri = $null;
        if([System.Uri]::TryCreate($uri, [System.UriKind]::Absolute, [ref] $validatedUri))
        {

            $token = [ContextHelper]::GetAccessToken($validatedUri.GetLeftPart([System.UriPartial]::Authority));

            # Validate if token is PAT using lenght (PAT has lengh of 52) else go with default bearer token
            if($token.length -eq 52)
            {
                $user = ""
                $base64AuthInfo = [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes(("{0}:{1}" -f $user,$token)))
                return @{
                    "Authorization"= ("Basic " + $base64AuthInfo); 
                    "Content-Type"="application/json"
                };
            }
            else {
                return @{
                    "Authorization"= ("Bearer " + $token); 
                    "Content-Type"="application/json"
                };
            }
            
        }
        
        return @{ "Content-Type"="application/json" };
    }

    hidden static [Hashtable] GetAuthHeaderFromUriPatch([string] $uri) {
        [System.Uri] $validatedUri = $null;
        if ([System.Uri]::TryCreate($uri, [System.UriKind]::Absolute, [ref] $validatedUri)) {

            $token = [ContextHelper]::GetAccessToken($validatedUri.GetLeftPart([System.UriPartial]::Authority));

            $user = ""
            $base64AuthInfo = [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes(("{0}:{1}" -f $user, $token)))
            return @{
                "Authorization" = ("Basic " + $base64AuthInfo)
                
            };
        }
        return @{};
    }

    static [System.Object[]] InvokePostWebRequest([string] $uri, [Hashtable] $headers, [System.Object] $body) 
    {
        return [WebRequestHelper]::InvokeWebRequest([Microsoft.PowerShell.Commands.WebRequestMethod]::Post, $uri, $headers, $body);
    }

    static [System.Object[]] InvokePostWebRequest([string] $uri, [System.Object] $body) 
    {
        return [WebRequestHelper]::InvokePostWebRequest($uri, [WebRequestHelper]::GetAuthHeaderFromUri($uri), $body);
    }

    static [System.Object[]] InvokeWebRequest([Microsoft.PowerShell.Commands.WebRequestMethod] $method, [string] $uri, [System.Object] $body) 
    {
        return [WebRequestHelper]::InvokeWebRequest($method, $uri, [WebRequestHelper]::GetAuthHeaderFromUri($uri), $body);
    }
    static [System.Object[]] InvokeWebRequest([Microsoft.PowerShell.Commands.WebRequestMethod] $method, [string] $uri, [Hashtable] $headers, [System.Object] $body) 
    {
        return [WebRequestHelper]::InvokeWebRequest($method, $uri, $headers, $body, $Null);
    }
    static [System.Object[]] InvokeWebRequest([Microsoft.PowerShell.Commands.WebRequestMethod] $method, [string] $uri, [Hashtable] $headers, [System.Object] $body, [string] $contentType) 
    {
        return [WebRequestHelper]::InvokeWebRequest($method, $uri, $headers, $body, $contentType, $false, $false) 
    }
    
    static [System.Object[]] InvokeWebRequest([Microsoft.PowerShell.Commands.WebRequestMethod] $method, [string] $uri, [Hashtable] $headers, [System.Object] $body, [string] $contentType, [Hashtable] $propertiesToReplace) 
    {
        $outputValues = @();
        [System.Uri] $validatedUri = $null;
        $orginalUri = "";
        while ([System.Uri]::TryCreate($uri, [System.UriKind]::Absolute, [ref] $validatedUri)) 
        {
            if([string]::IsNullOrWhiteSpace($orginalUri))
            {
                $orginalUri = $validatedUri.AbsoluteUri;
            }
            [int] $retryCount = 3
            $success = $false;
            while($retryCount -gt 0 -and -not $success)
            {
                $retryCount = $retryCount -1;
                try
                {
                    $requestResult = $null;
            
                    if ($method -eq [Microsoft.PowerShell.Commands.WebRequestMethod]::Get) 
                    {
                        $requestResult = Invoke-WebRequest -Method $method -Uri $validatedUri -Headers $headers -UseBasicParsing
                    }
                    elseif ($method -eq [Microsoft.PowerShell.Commands.WebRequestMethod]::Post -or $method -eq [Microsoft.PowerShell.Commands.WebRequestMethod]::Put) 
                    {
                        if($uri.EndsWith("`$batch"))
                        {
                            $requestResult = Invoke-WebRequest -Method $method -Uri $validatedUri -Headers $headers -Body $body -ContentType $contentType -UseBasicParsing
                            $success = $true
                            $uri = [string]::Empty
                        }
                        else
                        {
                            $requestResult = Invoke-WebRequest -Method $method -Uri $validatedUri -Headers $headers -Body ($body | ConvertTo-Json -Depth 10 -Compress) -UseBasicParsing
                        }
                    }    
                    else 
                    {
                        throw [System.ArgumentException] ("The web request method type '$method' is not supported.")
                    }        
            
                    if ($null -ne $requestResult -and $requestResult.StatusCode -ge 200 -and $requestResult.StatusCode -le 399) {
                        if (!$success -and $null -ne $requestResult.Content) {
                            $resultContent = $requestResult.Content
                            if($propertiesToReplace.Keys.Count -gt 0)
                            {
                                $propertiesToReplace.Keys  | Foreach-Object {
                                    $resultContent = $resultContent.ToString().Replace($_, $propertiesToReplace[$_])
                                }
                            }
                            $json = ConvertFrom-Json $resultContent
                            if ($null -ne $json) {
                                if (($json | Get-Member -Name "value") -and $json.value) {
                                    $outputValues += $json.value;
                                }
                                else {
                                    $outputValues += $json;
                                }
                        
                                if (($json | Get-Member -Name "nextLink") -and $json.nextLink) {
                                    $uri = $json.nextLink
                                }
                                elseif (($json | Get-Member -Name "@odata.nextLink") -and $json."@odata.nextLink")
                                {
                                    $uri = $json."@odata.nextLink"
                                }
                                elseif($requestResult.Headers.ContainsKey('x-ms-continuation-NextPartitionKey'))
                                {
                                    $nPKey = $requestResult.Headers["x-ms-continuation-NextPartitionKey"]
                                    $uri= $orginalUri + "&NextPartitionKey=$nPKey"
                                }
                                else {
                                    $uri = [string]::Empty;
                                }
                            }
                        }
                    }
                    $success = $true;
                }
                catch
                {
                    #eat the exception until it is in retry mode and throw once the retry is done
                    if($retryCount -eq 0)
                    {
                        if([Helpers]::CheckMember($_,"Exception.Response.StatusCode") -and  $_.Exception.Response.StatusCode -eq "Forbidden"){
                            throw ([SuppressedException]::new(("You do not have permission to view the requested resource."), [SuppressedExceptionType]::InvalidOperation))
                        }
                        elseif ([Helpers]::CheckMember($_,"Exception.Message")){
                            throw ([SuppressedException]::new(($_.Exception.Message.ToString()), [SuppressedExceptionType]::InvalidOperation))
                        }
                        else {
                            throw;
                        }
                    }                    
                }
            }
        }

        return $outputValues;
    }

    static [System.Object[]] InvokeWebRequest([Microsoft.PowerShell.Commands.WebRequestMethod] $method, [string] $uri, [Hashtable] $headers, [System.Object] $body, [string] $contentType, [bool] $isRetryRequired, [bool] $returnRawResponse) 
    {
        $outputValues = @();
        [System.Uri] $validatedUri = $null;
        $orginalUri = "";
        $skipCount = 0
        while ([System.Uri]::TryCreate($uri, [System.UriKind]::Absolute, [ref] $validatedUri)) 
        {
            [int] $retryCount = 1
            if($isRetryRequired)
            {
                $retryCount = 3
            }
            if([string]::IsNullOrWhiteSpace($orginalUri))
            {
                $orginalUri = $validatedUri.AbsoluteUri;
            }
            
            $success = $false;
            while($retryCount -gt 0 -and -not $success)
            {
                $retryCount = $retryCount -1;
                try
                {
                    $requestResult = $null;
            
                    if ($method -eq [Microsoft.PowerShell.Commands.WebRequestMethod]::Get) 
                    {
                        $requestResult = Invoke-WebRequest -Method $method -Uri $validatedUri -Headers $headers -UseBasicParsing
                    }
                    elseif ($method -eq [Microsoft.PowerShell.Commands.WebRequestMethod]::Post -or $method -eq [Microsoft.PowerShell.Commands.WebRequestMethod]::Put -or [Microsoft.PowerShell.Commands.WebRequestMethod]::Patch) 
                    {
                        if($uri.EndsWith("`$batch"))
                        {
                            $requestResult = Invoke-WebRequest -Method $method -Uri $validatedUri -Headers $headers -Body $body -ContentType $contentType -UseBasicParsing
                            $success = $true
                            $uri = [string]::Empty
                        }
                        elseif($uri.Contains("mspim"))
                        {
                            $requestResult = Invoke-WebRequest -Method $method -Uri $validatedUri -Headers $headers -Body $body -ContentType $contentType -UseBasicParsing
                        }
                        else
                        {
                            $requestResult = Invoke-WebRequest -Method $method -Uri $validatedUri -Headers $headers -Body ($body | ConvertTo-Json -Depth 10 -Compress) -UseBasicParsing
                        }
                    }    
                    else 
                    {
                        throw [System.ArgumentException] ("The web request method type '$method' is not supported.")
                    }
                    
                    if($returnRawResponse)
                    {
                        return $requestResult
                    }
            
                    if ($null -ne $requestResult -and $requestResult.StatusCode -ge 200 -and $requestResult.StatusCode -le 399) {
                        if (!$success -and $null -ne $requestResult.Content) {
                            $json = ConvertFrom-Json $requestResult.Content
                            if ($null -ne $json) {
                                if (($json | Get-Member -Name "value") -and $json.value) {
                                    $outputValues += $json.value;
                                }
                                else {
                                    $outputValues += $json;
                                }
                        
                                if (($json | Get-Member -Name "nextLink") -and $json.nextLink) {
                                    $uri = $json.nextLink
                                }
                                elseif($requestResult.Headers.ContainsKey('x-ms-continuation-NextPartitionKey'))
                                {
                                    $nPKey = $requestResult.Headers["x-ms-continuation-NextPartitionKey"]
                                    $uri= $orginalUri + "&NextPartitionKey=$nPKey"
                                }
                                elseif($requestResult.Headers.ContainsKey('x-ms-continuationtoken'))
                                {
                                    $nPKey = $requestResult.Headers["x-ms-continuationtoken"]
                                    #Azure devops API calls for different resource behave independently w.r.t continuationToken, we need to handle them separately
                                    # Pagination for build definitions always contains queryOrder
                                    if ($uri.Contains("build/definitions") -and $uri.Contains('queryOrder')) {
                                        # Handle the pagination for builds
                                        $skipCount = $skipCount+10000
                                        $uri= $orginalUri +"&%24skip="+$skipCount+ "&continuationToken="+$nPKey
                                    } 
                                    # Pagination for release definitions don't need queryOrder for pagination
                                    # $uri with $top returns continuation token, it should not continue further
                                    elseif ($uri.Contains("release/definitions") -and -not $uri.Contains('$top')){
                                        $uri= $orginalUri + "&continuationToken="+$nPKey
                                    }
                                    elseif ($uri.Contains("projects")){
                                        $uri= $orginalUri + "&continuationToken="+$nPKey
                                    }
                                    else {
                                        $uri = [string]::Empty;
                                    }
                                }
                                else {
                                    $uri = [string]::Empty;
                                }
                            }
                        }
                    }
                    $success = $true;
                }
                catch
                {
                    #eat the exception until it is in retry mode and throw once the retry is done
                    if($retryCount -eq 0)
                    {
                        if ($uri.Contains("mspim") -and [Helpers]::CheckMember($_,"ErrorDetails.Message"))
                        {
                            if( -not $returnRawResponse)
                            {
                                
                                    $err = $_.ErrorDetails.Message| ConvertFrom-Json
                                    throw ([SuppressedException]::new(($err), [SuppressedExceptionType]::Generic))
                                    
                                
                            }
                            else 
                            {                
                                throw $_;        
                            }
                            
                        }
                        elseif([Helpers]::CheckMember($_,"Exception.Response.StatusCode") -and  $_.Exception.Response.StatusCode -eq "Forbidden"){
                            throw ([SuppressedException]::new(("You do not have permission to view the requested resource."), [SuppressedExceptionType]::InvalidOperation))
                        }
                        elseif ([Helpers]::CheckMember($_,"Exception.Message")){
                            throw ([SuppressedException]::new(($_.Exception.Message.ToString()), [SuppressedExceptionType]::InvalidOperation))
                        }
                        
                        else {
                            throw;
                        }
                    }                    
                }
            }
        }

        return $outputValues;
    }
}

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