GoogleAuthenticationFactory.psm1

#region Public commands
function Get-GoogleAccessToken
{
    param
    (
        [switch]$AsHashTable,
        [Parameter()]
        $Factory = $script:GoogleTokenProvider
    )

    process
    {
        if($Factory -is [string])
        {
            #name of factory has been passed
            $Factory = Get-GoogleAuthenticationFactory -Name $Factory
        }
        $token = $Factory.GetAccessToken()
        if($AsHashTable)
        {
            @{
                Authorization = "$($token.token_type) $($token.access_token)"
            }
        }
        else
        {
            $token
        }
    }
}
function Get-GoogleAuthenticationFactory
{
    param
    (
        [Parameter()]
        [string]$Name,
        [switch]$All
    )

    process
    {
        if(-not [string]::IsNullOrEmpty($Name))
        {
            if($script:GoogleAuthenticationProviders.ContainsKey($Name))
            {
                return $script:GoogleAuthenticationProviders[$Name]
            }
            else
            {
                Write-Warning "No Google authentication provider registered with name '$Name'"
                return $null
            }
        }
        else
        {
            if($all)
            {
                return $script:GoogleAuthenticationProviders.Values
            }
            else
            {
                return $script:GoogleTokenProvider
            }
        }
    }
}
function New-GoogleAuthenticationFactory
{
    param
    (
        [Parameter(Mandatory)]
        [string]
            #Google access JSON file content
        $GoogleAccessJson,
        
        [Parameter(Mandatory)]
        [string[]]
            #Scopes requested to be granted
        $Scopes,
        
        [Parameter()]
        [string]
            #Impersonated user email address
            # If not specified, impoersonation will not be used
        $TargetUserEmail,
        
        [Parameter()]
        [string]
            #Name of the factory instance
            # If specified, the factory will be registered in the global dictionary of Google authentication providers
        $Name,
        [Parameter()]
            #AI logger to use for logging to Application insights
            #Instance of this logger can be obtained via module AiLogging
        $AiLogger
    )

    process
    {
        if(-not [string]::IsNullOrEmpty($TargetUserEmail))
        {
            Write-Verbose "Using impersonation for user $TargetUserEmail"
        }
        $script:GoogleTokenProvider = [GoogleTokenProvider]::new($GoogleAccessJson, $scopes, $TargetUserEmail, $Name, $AiLogger)
        $script:GoogleTokenProvider
        if(-not [string]::IsNullOrEmpty($Name))
        {
            $script:GoogleAuthenticationProviders[$Name] = $script:GoogleTokenProvider
            Write-Verbose "Registered Google authentication provider with name '$Name'"
        }
    }
}
function Test-GoogleAccessToken {
    [CmdletBinding()]
    param
    (
        [Parameter()]
        $Factory = $script:GoogleTokenProvider
    )

    process
    {
        if($Factory -is [string])
        {
            #name of factory has been passed
            $Factory = Get-GoogleAuthenticationFactory -Name $GoogleTokenProvider
        }
        $Factory.TestAccessToken()
    }
}
#endregion Public commands
#region Internal commands
class GoogleTokenProvider
{
    hidden [PSCustomObject]$credential
    hidden $token
    hidden $AiLogger
    [string] $Name
    [string[]] $scopes
    [string] $TargetUserEmail

    GoogleTokenProvider([string]$googleAccessJson , [string[]]$scopes, $TargetUserEmail, $Name, $AiLogger = $null)
    {
        $this.scopes = $scopes
        $this.TargetUserEmail = $TargetUserEmail
        $this.Name = $Name
        $this.credential = ConvertFrom-Json -InputObject $GoogleAccessJson -Depth 10
        $this.AiLogger = $AiLogger
    }
    
    [PSCustomObject]GetAccessToken()
    {
        if($null -eq $this.token -or $this.token.expiration_time -lt ([DateTime]::UtcNow))
        {
            Write-Verbose "Fetching new access token for Google API"
            $ServiceAccountEmail = $this.credential.client_email
            $PrivateKey = $this.credential.private_key -replace '-----BEGIN PRIVATE KEY-----\n' -replace '\n-----END PRIVATE KEY-----\n' -replace '\n'
            $header = @{
                alg = "RS256"
                typ = "JWT"
            }
            $headerBase64 = [System.Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes(($header | ConvertTo-Json)))
            $timestamp = [Math]::Round((Get-Date -UFormat %s))
            
            $claimSet = @{
                iss   = $ServiceAccountEmail
                scope = ($this.Scopes -join " ")
                aud   = "https://oauth2.googleapis.com/token"
                exp   = $timestamp + 3600
                iat   = $timestamp
            }
            if(-not [string]::IsNullOrEmpty($this.TargetUserEmail))
            {
                $claimSet.sub =$this.TargetUserEmail
            }
            $claimSetBase64 = [System.Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes(($claimSet | ConvertTo-Json)))
            $signatureInput = $headerBase64 + "." + $claimSetBase64
            $signatureBytes = [System.Text.Encoding]::UTF8.GetBytes($signatureInput)
            $privateKeyBytes = [System.Convert]::FromBase64String($PrivateKey)
            $rsaProvider = [System.Security.Cryptography.RSA]::Create()
            $bytesRead = $null
            $rsaProvider.ImportPkcs8PrivateKey($privateKeyBytes, [ref]$bytesRead)
            $signature = $rsaProvider.SignData($signatureBytes, [System.Security.Cryptography.HashAlgorithmName]::SHA256, [System.Security.Cryptography.RSASignaturePadding]::Pkcs1)
            $signatureBase64 = [System.Convert]::ToBase64String($signature)
            $jwt = $headerBase64 + "." + $claimSetBase64 + "." + $signatureBase64
            $body = @{
                grant_type = "urn:ietf:params:oauth:grant-type:jwt-bearer"
                assertion  = $jwt
            }
            $requestStart = Get-Date
            $tokenUri = "https://oauth2.googleapis.com/token"
            $response = Invoke-RestMethod -Uri $tokenUri -Method POST -Body $body -ContentType "application/x-www-form-urlencoded"
            if($this.AiLogger)
            {
                Write-AiDependency -Target 'GoogleAuth' -DependencyType 'HTTP' -Name 'GetAccessToken' -Data $tokenUri -Start $requestStart -ResultCode 'Ok' -Success $true -Connection $this.AiLogger
            }

            $response | Add-Member -MemberType NoteProperty -Name expiration_time -Value ([DateTime]::UtcNow.AddSeconds($response.expires_in)) -PassThru

            $this.Token = $response
        }
        return $this.token
    }

    [PSCustomObject]TestAccessToken()
    {
        $t = $this.GetAccessToken()
        $headers = @{
            Authorization = "$($t.token_type) $($t.access_token)"
        }
        $tokenUri = 'https://www.googleapis.com/oauth2/v3/tokeninfo'
        $requestStart = Get-Date
        $response = Invoke-RestMethod -Uri $tokenUri -Headers $headers
        if($this.AiLogger)
        {
            Write-AiDependency -Target 'GoogleAuth' -DependencyType 'HTTP' -Name 'TestAccessToken' -Data $tokenUri -Start $requestStart -ResultCode 'Ok' -Success $true -Connection $this.AiLogger
        }

        return $response
    }
}
#endregion Internal commands
#region Module initialization
$script:GoogleAuthenticationProviders = @{}
#endregion Module initialization

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