Public/General.ps1

Function Invoke-DatabricksApiRequest {
    <#
            .SYNOPSIS
            Lists all jobs or returns a specific job for a given JobID.
            .DESCRIPTION
            Lists all jobs or returns a specific job for a given JobID.
            Official API Documentation: https://docs.databricks.com/api/latest/jobs.html#list
            Official API Documentation: https://docs.databricks.com/api/latest/jobs.html#get
            .PARAMETER Method
            The type of request you want to invoke. Will usually be GET or POST
            .PARAMETER EndPoint
            The API endpoint that you want to invoke. Please check the API reference for valid values. Example: "/2.0/jobs/list"
            .PARAMETER Body
            Some endpoints also support a body to supply additional information. This can be specified here. For POST requests, this is usually a JSON-string whereas for GET it is usually a hashtable which is then converted to URL parameters
            .EXAMPLE
            Invoke-DatabricksApiRequest -Method GET -EndPoint "/2.0/jobs/list"
    #>

    [CmdletBinding()]
    param 
    (    
        [Parameter(Mandatory = $true, Position = 1)] [string] [ValidateSet("DEFAULT", "DELETE", "GET", "HEAD", "MERGE", "OPTIONS", "PATCH", "POST", "PUT", "TRACE")] $Method,
        [Parameter(Mandatory = $true, Position = 2)] [string] $EndPoint,
        [Parameter(Mandatory = $false, Position = 3)] $Body,
        [Parameter(Mandatory = $false, Position = 4)] $ContentType,
        [Parameter(Mandatory = $false, Position = 5)] $Accept
    )
    Test-Initialized     

    Write-Verbose "Setting final ApiURL ..."
    $apiUrl = Get-ApiUrl -ApiEndpoint $EndPoint
    Write-Verbose "API Call: $Method $apiUrl"
    
    #Set headers
    Write-Verbose "Building Headers ..."
    $headers = Get-RequestHeader
    $headers | Add-Property -Name "Content-Type" -Value $ContentType -Force
    $headers | Add-Property -Name "Accept" -Value $Accept -Force
    Write-Verbose "Headers: `n$($headers | Out-String)"
    
    if ($Method -eq "GET") {    
        Write-Verbose "GET request - showing URL parameters as Key-Value pairs ..."
        Write-Verbose "Body: `n$($Body | Out-String)"
    }
    else {
        # for POST requests we have to convert the body to JSON
        Write-Verbose "Non-GET request - converting Body to JSON ..."
        $Body = $Body | ConvertTo-Json -Depth 20
        
        Write-Verbose "Body: `n$($Body)"
    }
        
    $retry = 0
    do {
        try {
            $result = Invoke-RestMethod -Uri $apiUrl -Method $Method -Headers $headers -Body $Body
            # exit loop after successful execution
            break
        } 
        catch {
            $retry += 1
            if ($retry -le $script:dbApiCallRetryCount) {
                Write-Warning $_.Exception
                Write-Warning $_
                Write-Information "Retrying API call ($retry of $($script:dbApiCallRetryCount) retries) ..."
                Start-Sleep -Seconds $script:dbApiCallRetryWait
            }
            else {
                Write-Error  $_
            }
        }                
    }
    while ($retry -le $script:dbApiCallRetryCount)    
    
    Write-Verbose "Response: $($result | ConvertTo-Json -Depth 10)"
    
    return $result
}

Function Set-DatabricksEnvironment {
    <#
            .SYNOPSIS
            Sets global module config variables AccessToken, CloudProvider and ApirRootUrl
            .DESCRIPTION
            Sets global module config variables AccessToken, CloudProvider and ApirRootUrl
            .PARAMETER PBIAPIUrl
            The url for the PBI API
            .PARAMETER AccessToken
            The AccessToken to use to access the Databricks API
            For example: dapi1234abcd32101691ded20b53a1326285
            .PARAMETER ApiRootUrl
            The URL of the API.
            For Azure, this could be 'https://westeurope.azuredatabricks.net'
            For AWS, this could be 'https://abc-12345-xaz.cloud.databricks.com'
            .PARAMETER CloudProvider
            The CloudProvider where the Databricks workspace is hosted. Can either be 'Azure' or 'AWS'.
            If not provided, it is derived from the ApiRootUrl parameter and/or the type of authentication
            .PARAMETER Credential
            The Powershell credential to use when using AAD authentication.
            .PARAMETER ClientID
            The ID of the Azure Active Directory (AAD) application that was deployed to use AAD authentication with Databricks.
            If used in combination with -ServicePrincipal this value does not have to be supplied but is overwritten using the Usernamen from -Credential.
            .PARAMETER TenantID
            The ID of the Azure Active Directory (AAD). (optional)
            .PARAMETER AzureResourceID
            This is the ID of the workspace appliance resource in Azure. You must​ provide this ID if the Databricks workspace is not provisioned yet (such that there is no effective workspace org ID). It can be composed using the Azure subscription ID, resource group name, and workspace resource name.
            Example: /subscriptions/<<SubscriptionID>>/resourceGroups/<<ResourceGroupName>>/providers/Microsoft.Databricks/workspaces/<<WorkspaceName>>
            .PARAMETER OrgID
            The organization ID of the Databricks workspace.
            You can find the workspace org ID in the Databricks URL, for example: https://<region>.azuredatabricks.net/?o=<​org_id​>
            .PARAMETER SubscriptionID
            The Azure subscription ID in which the Databricks workspace resides.
            A GUID, e.g. 058a2e1e-1234-1234-1234-5c4c3e31e36e
            .PARAMETER ResourceGroupName
            The name of the ResourceGroup in which the Databricks workspace resides.
            .PARAMETER WorkspaceName
            The name of the Databricks workspace.
            .PARAMETER ServicePrincipal
            A switch indicating -Credential is a Service Principal which will be used for Authentication.
            .PARAMETER DynamicParameterCacheTimeout
            To improve performance during development dynamic paramters can be cached. This setting controls the number of seconds these values are persisted before the API is queried again for more recent values.
            .PARAMETER ApiCallRetryCount
            Number of times an API call is tried before an actual error is thrown.
            .PARAMETER ApiCallRetryWait
            Number of seconds to wait before retrying an API call.
            .EXAMPLE
            Set-DatabricksEnvironment -AccessToken "dapi1234abcd32101691ded20b53a1326285" -ApiRootUrl "https://abc-12345-xaz.cloud.databricks.com"
            .EXAMPLE
            Set-DatabricksEnvironment -AccessToken "dapi1234abcd32101691ded20b53a1326285" -ApiRootUrl "https://westeurope.azuredatabricks.net"
            .EXAMPLE
            $azureResourceId = '/subscriptions/fb1e20c4-1234-1234-1234-f92a9ac35db4/resourceGroups/myResourceGroupName/providers/Microsoft.Databricks/workspaces/myDatabricksResource'
            $cred = Get-Credential
            Set-DatabricksEnvironment -ClientID '058a2e1e-1234-1234-1234-5c4c3e31e36e' -Credential $cred -AzureResourceID $azureResourceId -ApiRootUrl "https://westeurope.azuredatabricks.net"
             
    #>

    [CmdletBinding()]
    param
    (
        [Parameter(ParameterSetName = "DatabricksApi", Mandatory = $true, Position = 1)] [string] $AccessToken,
        
        [Parameter(ParameterSetName = "AADAuthenticationResourceID", Mandatory = $true, Position = 1)]
        [Parameter(ParameterSetName = "AADAuthenticationOrgID", Mandatory = $true, Position = 1)]
        [Parameter(ParameterSetName = "AADAuthenticationResourceDetails", Mandatory = $true, Position = 1)][PSCredential] $Credential,
        
        [Parameter(ParameterSetName = "AADAuthenticationResourceID", Mandatory = $true, Position = 2)]
        [Parameter(ParameterSetName = "AADAuthenticationOrgID", Mandatory = $true, Position = 2)]
        [Parameter(ParameterSetName = "AADAuthenticationResourceDetails", Mandatory = $true, Position = 2)][string] $ClientID,
        
        [Parameter(ParameterSetName = "AADAuthenticationResourceID", Mandatory = $true, Position = 4)]
        [Parameter(ParameterSetName = "AADAuthenticationOrgID", Mandatory = $true, Position = 4)]
        [Parameter(ParameterSetName = "AADAuthenticationResourceDetails", Mandatory = $true, Position = 4)] [string] $TenantID = "common",
        
        [Parameter(ParameterSetName = "AADAuthenticationResourceID", Mandatory = $true, Position = 3)] [string] $AzureResourceID,
        
        [Parameter(ParameterSetName = "AADAuthenticationOrgID", Mandatory = $true, Position = 3)] [string] $OrgID,
        
        [Parameter(ParameterSetName = "AADAuthenticationResourceDetails", Mandatory = $true, Position = 3)] [string] $SubscriptionID,
        [Parameter(ParameterSetName = "AADAuthenticationResourceDetails", Mandatory = $true, Position = 5)] [string] $ResourceGroupName,
        [Parameter(ParameterSetName = "AADAuthenticationResourceDetails", Mandatory = $true, Position = 6)] [string] $WorkspaceName,
        
        [Parameter(ParameterSetName = "AADAuthenticationResourceID", Mandatory = $false, Position = 7)]
        [Parameter(ParameterSetName = "AADAuthenticationOrgID", Mandatory = $false, Position = 7)]
        [Parameter(ParameterSetName = "AADAuthenticationResourceDetails", Mandatory = $false, Position = 7)][switch] $ServicePrincipal,

        [Parameter(Mandatory = $false, Position = 2)] [int] $DynamicParameterCacheTimeout = 5,
        [Parameter(Mandatory = $false, Position = 3)] [int] $ApiCallRetryCount = -1,
        [Parameter(Mandatory = $false, Position = 4)] [int] $ApiCallRetryWait = 10,

        [Parameter(Mandatory = $false, Position = 5)] [string] $CustomApiRootUrl
    )
    DynamicParam {
        #Create the RuntimeDefinedParameterDictionary
        $Dictionary = New-Object System.Management.Automation.RuntimeDefinedParameterDictionary
        
        New-DynamicParam -Name ApiRootUrl -ValidateSet $script:dbApiRootUrls -DPDictionary $Dictionary
            
        #return RuntimeDefinedParameterDictionary
        return $Dictionary
    }

    begin {
        Write-Verbose "Setting [System.Net.ServicePointManager]::SecurityProtocol to [System.Net.SecurityProtocolType]::Tls12 ..."
        [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]::Tls12
        Write-Verbose "Done!"
    }

    process {
        $x = Clear-ScriptVariables

        if (-not $PSBoundParameters.ApiRootUrl -and -not $PSBoundParameters.CustomApiRootUrl) {
            Write-Error "Parameter -ApiRootUrl or -CustomApiRootUrl needs to be specified!"
        }
        elseif ($PSBoundParameters.CustomApiRootUrl) {
            $ApiRootUrl = $PSBoundParameters.CustomApiRootUrl
        }
        else {
            $ApiRootUrl = $PSBoundParameters.ApiRootUrl
        }
        

        #region Dynamic Parameter Caching
        Write-Verbose "Setting Dynamic Parameter Cache Timeout to $DynamicParameterCacheTimeout seconds ..."
        $script:dbDynamicParameterCacheTimeout = $DynamicParameterCacheTimeout
        #endregion
        
        #region Dynamic Parameter Caching
        Write-Verbose "Setting API Call Retry Count to $ApiCallRetryCount retries ..."
        $script:dbApiCallRetryCount = $ApiCallRetryCount
        #endregion
        
        #region Dynamic Parameter Caching
        Write-Verbose "Setting API Call Retry Wait to $ApiCallRetryWait seconds ..."
        $script:dbApiCallRetryWait = $ApiCallRetryWait
        #endregion

        #region check ApiRootUrl
        $paramToCheck = 'ApiRootUrl'
        Write-Verbose "Checking if Parameter -$paramToCheck was provided ..."
        if ($ApiRootUrl -ne $null) {
            Write-Verbose "$paramToCheck provided! Setting global $paramToCheck ..."
            $script:dbApiRootUrl = $ApiRootUrl.Trim('/') + "/api"
            Write-Verbose "Done!"
        }
        else {
            Write-Warning "Parameter -$paramToCheck was not provided!"
        }

        Write-Verbose "Trying to derive CloudProvider from ApiRootUrl ..."
        Write-Verbose "Checking if ApiRootUrl contains '.azuredatabricks.' ..."
        if ($ApiRootUrl -ilike "*.azuredatabricks.*") {
            Write-Verbose "'.azuredatabricks.' found in ApiRootUrl - Setting CloudProvider to 'Azure' ..."
            $script:dbCloudProvider = "Azure"
        }
        else {
            Write-Verbose "'.azuredatabricks.' not found in ApiRootUrl - Setting CloudProvider to 'AWS' ..."
            $script:dbCloudProvider = "AWS"
        }
        Write-Verbose "Done!"
        #endregion

        #region Databricks API Key
        if ($PSCmdlet.ParameterSetName -eq "DatabricksApi") {
            Write-Verbose "Using Databricks API authentication via API Token ..."
            $script:dbAuthenticationProvider = "DatabricksApi" 
                
            $script:dbAuthenticationHeader = @{
                "Authorization" = "Bearer $AccessToken"
            }
        }
        #endregion
        #region AAD Authentication using Resource
        elseif ($PSCmdlet.ParameterSetName -ilike "AADAuthenticationResource*") {
            $script:dbAuthenticationProvider = "AADAuthentication" 
            
            if ($PSCmdlet.ParameterSetName -eq "AADAuthenticationResourceDetails") {
                Write-Verbose "Using AAD authentication with Azure Resource Details ..."
                $AzureResourceID = "/subscriptions/$SubscriptionID/resourceGroups/$ResourceGroupName/providers/Microsoft.Databricks/workspaces/$WorkspaceName"
            }
            elseif ($PSCmdlet.ParameterSetName -eq "AADAuthenticationResourceID") {
                Write-Verbose "Using AAD authentication with Azure ResourceID ..."
                
                $paramToCheck = 'ApiRootUrl'
                $wildCardPattern = '/subscriptions/*/resourceGroups/*/providers/Microsoft.Databricks/workspaces/*'
                Write-Verbose "Checking format of -$paramToCheck ..."
                
                if (-not ($AzureResourceID -ilike $wildCardPattern)) {
                    Write-Error "Invalid -$paramToCheck provided! it has to match the following pattern: $wildCardPattern"
                }
                
                Write-Verbose "Parameter -$paramToCheck has a valid format!"
            }
                
            $script:dbAuthenticationHeader = @{
                "X-Databricks-Azure-Workspace-Resource-Id" = $AzureResourceID
            }
        }
        #endregion
        #region AAD Authentication using Org ID
        elseif ($PSCmdlet.ParameterSetName -eq "AADAuthenticationOrgID") {
            Write-Verbose "Using AAD authentication with Databricks Org ID ..." 
            $script:dbAuthenticationProvider = "AADAuthentication" 
                
            $script:dbAuthenticationHeader = @{
                "X-Databricks-Org-Id" = $OrgID
            }
        }
        #endregion
        #region AAD Authentication General
        if ($PSCmdlet.ParameterSetName.StartsWith("AADAuthentication")) {
            $script:dbCloudProvider = "Azure"
            $authUrl = "https://login.windows.net/$TenantID/oauth2/token/"

            Write-Verbose "Getting AAD access token ..."
            if ($ServicePrincipal) {
                Write-Verbose "Using Service Principal authentication flow ..."

                $headers = @{
                    "Content-Type" = "application/x-www-form-urlencoded"
                }
                
                $body = @{
                    "resource"      = "2ff814a6-3304-4ab8-85cb-cd0e6f879c1d" # Resource ID for AzureDatabricks, this is fixed!
                    "grant_type"    = "client_credentials"
                    "client_id"     = $Credential.UserName
                    "client_secret" = $Credential.GetNetworkCredential().Password
                }

                Write-Verbose "API Call: POST $authUrl"
                Write-Verbose "Body: `n$($Body | Out-String)"
                
                $authResultLoginApp = Invoke-RestMethod -Uri $authUrl -Method POST -Headers $headers -Body $body

                $body["resource"] = "https://management.core.windows.net/" # Resource ID for AzureDatabricks, this is fixed!

                Write-Verbose "API Call: POST $authUrl"
                Write-Verbose "Body: `n$($Body | Out-String)"
                
                $authResultMgmt = Invoke-RestMethod -Uri $authUrl -Method POST -Headers $headers -Body $body

                $script:dbAuthenticationHeader["Authorization"] = "$($AuthResultLoginApp.token_type) $($authResultLoginApp.access_token)"
                $script:dbAuthenticationHeader["X-Databricks-Azure-SP-Management-Token"] = $authResultMgmt.access_token
            }
            else {
                Write-Verbose "Using Username/Password authentication flow ..."
                
                $body = @{
                    "resource"   = "2ff814a6-3304-4ab8-85cb-cd0e6f879c1d" # Resource ID for AzureDatabricks, this is fixed!
                    "grant_type" = "password"
                    "client_id"  = $ClientId
                    "username"   = $Credential.UserName
                    "password"   = $Credential.GetNetworkCredential().Password
                    "scope"      = "openid"
                }
                Write-Verbose "API Call: POST $authUrl"
                Write-Verbose "Body: `n$($Body | Out-String)"
                
                $authResult = Invoke-RestMethod -Uri $authUrl -Method POST -Body $body
                
                $script:dbAuthenticationHeader["Authorization"] = "$($authResult.token_type) $($authResult.access_token)"
            }
        } 
        #endregion
        
        $script:dbInitialized = $true
    }
}

Function Clear-DatabricksEnvironment {
    <#
            .SYNOPSIS
            Clears the current DatabricksPS environment and removes all settings and references
            .DESCRIPTION
            Clears the current DatabricksPS environment and removes all settings and references
            .EXAMPLE
            Clear-DatabricksEnvironment
    #>

    [CmdletBinding()]
    param ()

    Clear-ScriptVariables
}

Function Test-DatabricksEnvironment {
    <#
            .SYNOPSIS
            Runs the most simple operation possible that should work on any Databricks environment - listing all items in DBFS under "/"
            .DESCRIPTION
            Runs the most simple operation possible that should work on any Databricks environment - listing all items in DBFS under "/"
            Official API Documentation: https://docs.databricks.com/api/latest/workspace.html#list
            .EXAMPLE
            Test-DatabricksEnvironment
    #>

    [CmdletBinding()]
    param ()

    $requestMethod = "GET"
    $apiEndpoint = "/2.0/dbfs/list"        

    Write-Verbose "Building Body/Parameters for final API call ..."
    #Set parameters
    $parameters = @{
        path = "/" 
    }
    
    $result = Invoke-DatabricksApiRequest -Method $requestMethod -EndPoint $apiEndpoint -Body $parameters

    return $result.files
}

Function Clear-DatabricksCachedDynamicParameterValue {
    <#
            .SYNOPSIS
            Clears all cached values for Dynamic Parameters if -UseDynamicParameterValueCaching was used during Set-DatabricksEnvironment
            .DESCRIPTION
            Clears all cached values for Dynamic Parameters if -UseDynamicParameterValueCaching was used during Set-DatabricksEnvironment
            .PARAMETER DynamicParameterName
            Unique Name of the Dynamic Parameter
            .EXAMPLE
            Clear-DatabricksCachedDynamicParameterValue
    #>

    [CmdletBinding()]
    param ()
    DynamicParam {
        #Create the RuntimeDefinedParameterDictionary
        $Dictionary = New-Object System.Management.Automation.RuntimeDefinedParameterDictionary

        $values = $script:dbCachedDynamicParamValues.Keys
        New-DynamicParam -Name DynamicParameterName -ValidateSet $values -ValueFromPipelineByPropertyName -DPDictionary $Dictionary
        
        #return RuntimeDefinedParameterDictionary
        return $Dictionary
    }
    begin {
        
    }
    process {
        $DynamicParameterName = $PSBoundParameters.DynamicParameterName
        
        if ($DynamicParameterName) {
            $script:dbCachedDynamicParamValues.Remove($DynamicParameterName)
        }
        else {
            $script:dbCachedDynamicParamValues = @{ }
        }
    }
}

Function Set-DatabricksDynamicParameterCacheTimeout {
    <#
            .SYNOPSIS
            Set the timeout in seconds for how long Cached Dynamic Parameter Values are valid (e.g. ClusterID, JobID, ...)
            .DESCRIPTION
            Set the timeout in seconds for how long Cached Dynamic Parameter Values are valid (e.g. ClusterID, JobID, ...)
            .PARAM Seconds
            Number of seconds the Cached Dynamic PArameter Values are valid
            .EXAMPLE
            Set-DatabricksDynamicParameterCacheTimeout -Seconds 10
    #>

    [CmdletBinding()]
    param (
        [parameter(Mandatory = $true)] [int] $Seconds
    )

    $script:dbDynamicParameterCacheTimeout = $Seconds
}

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.