AzureFunctionsKickOff.ps1

param(
    [parameter(Mandatory = $true)] [string]$functionName,
    [parameter(Mandatory = $true)] [string]$appName,
    [parameter(Mandatory = $true)] [string]$resourceGroup
)

function Get-KuduCredentials($appName, $resourceGroup) {

    [xml]$x = Get-AzureRmWebAppPublishingProfile -ResourceGroupName $resourceGroup -Name $appName
    $user = $x.publishData.publishProfile[1].userName.Split("\") | Select-Object -Last 1
    $pass = $x.publishData.publishProfile[1].userPWD
    $pair = "$($user):$($pass)"

    $encodedCreds = [System.Convert]::ToBase64String([System.Text.Encoding]::ASCII.GetBytes($pair))
    return $encodedCreds
}

function Get-FunctionKey([string]$appName, [string]$functionName, [string]$encodedCreds) {
    $jwt = Invoke-RestMethod -Uri "https://$($appName).scm.azurewebsites.net/api/functions/admin/token" -Headers @{Authorization = ("Basic {0}" -f $encodedCreds)} -Method GET

    $keys = Invoke-RestMethod -Method GET -Headers @{Authorization = ("Bearer {0}" -f $jwt)} `
        -Uri "https://$appName.azurewebsites.net/admin/functions/$functionName/keys/adf"
    $code = $keys.value
    return $code
}

if ([string]::IsNullOrEmpty($(Get-AzureRmContext).Account)) {
    Login-AzureRmAccount
}

Function Invoke-AzureFunction {
    [parameter(Mandatory = $true)] [string]$functionName,
    [parameter(Mandatory = $true)] [string]$appName,
    [parameter(Mandatory = $true)] [string]$code
    try {
        $funcUri = "https://$($appName).azurewebsites.net/api/$($functionName)?code=$($code)"
        Write-Host $funcUri
        Invoke-RestMethod -Method POST -Uri $funcUri
    }
    catch {
        throw $_.Exception
    }
}

$kuduCreds = Get-KuduCredentials $appName $resourceGroup
$code = Get-FunctionKey $appName $functionName $kuduCreds
Invoke-AzureFunction $functionName $appName $code