AkamaiPowershell

1.10.0

shared/Invoke-AkamaiRestMethod.ps1

                                #Requires -Version 3.0

<#

  Copyright 2019 Akamai Technologies, Inc. All Rights Reserved.

  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.

  Author: Stuart Macleod

  Senior Technical Project Manager

  Akamai Technologies Inc.

  Adapted from Invoke-AkamaiOpen (https://github.com/akamai/AkamaiOPEN-edgegrid-powershell/blob/master/Invoke-AkamaiOPEN.ps1)

  Author: Josh Hicks

  Solutions Architect

  Akamai Technologies Inc.

  Copyright 2016

#>

<#

.SYNOPSIS

EdgeGrid Powershell

.DESCRIPTION

Authorization wrapper around Invoke-RestMethod for use with Akamai's OPEN API initiative.

.PARAMETER Method

Request method. Valid values are GET, POST, PUT, and DELETE

.PARAMETER Path

Request path without hostname or scheme, but including any request parameters

.PARAMETER EdgeRCFile

File-based Auth - Authorization file to read credentials from. Defaults to ~/.edgerc

.PARAMETER Section

File-based Auth - Section in EdgeRC file to read credentials from. Defaults to [default]

.PARAMETER AccountSwitchKey

Switch key to be used by Akamai Partners or internal users in order to apply a command to another account

.PARAMETER Body

Should contain the POST/PUT Body. The body should be structured like a JSON object. Example: $Body = '{ "name": "botlist2", "type": "IP", "list": ["201.22.44.12", "8.7.6.0/24"] }'

.PARAMETER AdditionalHeaders

Hashtable of additional request headers to add

.PARAMETER Staging

Image Manager requests only. Changes IM host from production to staging. For non-IM requests does nothing.

.EXAMPLE

Invoke-AkamaiRestMethod -Method GET -Path '/path/to/api?withParams=true' -EdgeRCFile ~/my.edgerc -Section 'papi'

.LINK

developer.akamai.com

#>

function Invoke-AkamaiRestMethod {

    param(

        [Parameter(Mandatory = $false)] [ValidateSet("GET", "PUT", "POST", "DELETE", "PATCH")] [string] $Method = "GET",

        [Parameter(Mandatory = $true)]  [string] $Path,

        [Parameter(Mandatory = $false)] $Body,

        [Parameter(Mandatory = $false)] [string] $InputFile,

        [Parameter(Mandatory = $false)] [string] $OutputFile,

        [Parameter(Mandatory = $false)] [string] $EdgeRCFile,

        [Parameter(Mandatory = $false)] [string] $Section,

        [Parameter(Mandatory = $false)] [string] $AccountSwitchKey,

        [Parameter(Mandatory = $false)] [hashtable] $AdditionalHeaders,

        [Parameter(Mandatory = $false)] [string] $MaxBody = 131072,

        [Parameter(Mandatory = $false)] [string] $ResponseHeadersVariable

    )

    # Get auth creds from various potential sources

    $Auth = Get-AkamaiCredentials -EdgeRCFile $EdgeRCFile -Section $Section -AccountSwitchKey $AccountSwitchKey

    if($Debug){

        ## Check creds if in Debug mode

        Test-Auth -Auth $Auth

    }

    # Add account switch key from $Auth, if present

    if($Auth.account_key){

        if($Path.Contains('?')){ $Path += '&' }

        else{ $Path += '?' }

        $Path += "accountSwitchKey=$($Auth.account_key)"

    }

    # Sanitise query string

    if ($Path.Contains('?')) {

        $PathElements = $Path.Split('?')

        $PathOnly = $PathElements[0]

        $QueryString = $PathElements[1]

        $SanitisedQuery = Sanitise-QueryString -QueryString $QueryString

        Write-Debug "Original Query = $QueryString"

        Write-Debug "Sanitised Query = $SanitisedQuery"

        # Reconstruct Path

        if ($SanitisedQuery) {

            $Path = $PathOnly + '?' + $SanitisedQuery

        }

        else {

            $Path = $PathOnly

        }

    }

    # Set ReqURL from host and provided path

    $ReqURL = "https://" + $Auth.host + $Path

    # ReqURL Verification

    Write-Debug "Request URL = $ReqURL"

    If ($null -eq ($ReqURL -as [System.URI]).AbsoluteURI -or $ReqURL -notmatch "akamaiapis.net") {

        throw "Error: Invalid Request URI"

    }

    # Sanitize Method param

    $Method = $Method.ToUpper()

    # Timestamp for request signing

    $TimeStamp = [DateTime]::UtcNow.ToString("yyyyMMddTHH:mm:sszz00")

    # GUID for request signing

    $Nonce = [GUID]::NewGuid()

    # Build data string for signature generation

    $SignatureData = $Method + "`thttps`t"

    $SignatureData += $Auth.host + "`t" + $Path

    # Add body to signature. Truncate if body is greater than max-body (Akamai default is 131072). PUT Method does not require adding to signature.

    if ($Method -eq "POST") {

        if ($Body) {

            $Body_SHA256 = [System.Security.Cryptography.SHA256]::Create()

            if ($Body.Length -gt $MaxBody) {

                $Body_Hash = [System.Convert]::ToBase64String($Body_SHA256.ComputeHash([System.Text.Encoding]::ASCII.GetBytes($Body.Substring(0, $MaxBody))))

            }

            else {

                $Body_Hash = [System.Convert]::ToBase64String($Body_SHA256.ComputeHash([System.Text.Encoding]::ASCII.GetBytes($Body)))

            }

            $SignatureData += "`t`t" + $Body_Hash + "`t"

        }

        elseif ($InputFile) {

            $Body_SHA256 = [System.Security.Cryptography.SHA256]::Create()

            if($PSVersionTable.PSVersion.Major -le 5) {

                $Bytes = Get-Content $InputFile -Encoding Byte

            }

            else{

                $Bytes = Get-Content $InputFile -AsByteStream

            }

            if ($Bytes.Length -gt $MaxBody) {

                $Body_Hash = [System.Convert]::ToBase64String($Body_SHA256.ComputeHash($Bytes[0..($MaxBody - 1)]))

            }

            else {

                $Body_Hash = [System.Convert]::ToBase64String($Body_SHA256.ComputeHash($Bytes))

            }

            $SignatureData += "`t`t" + $Body_Hash + "`t"

            Write-Debug "Signature generated from input file $InputFile"

        }

        else {

            $SignatureData += "`t`t`t"

        }

    }

    else {

        $SignatureData += "`t`t`t"

    }

    $SignatureData += "EG1-HMAC-SHA256 "

    $SignatureData += "client_token=" + $Auth.client_token + ";"

    $SignatureData += "access_token=" + $Auth.access_token + ";"

    $SignatureData += "timestamp=" + $TimeStamp + ";"

    $SignatureData += "nonce=" + $Nonce + ";"

    Write-Debug "SignatureData = $SignatureData"

    # Generate SigningKey

    $SigningKey = Crypto -secret $Auth.client_secret -message $TimeStamp

    # Generate Auth Signature

    $Signature = Crypto -secret $SigningKey -message $SignatureData

    # Create AuthHeader

    $AuthorizationHeader = "EG1-HMAC-SHA256 "

    $AuthorizationHeader += "client_token=" + $Auth.client_token + ";"

    $AuthorizationHeader += "access_token=" + $Auth.access_token + ";"

    $AuthorizationHeader += "timestamp=" + $TimeStamp + ";"

    $AuthorizationHeader += "nonce=" + $Nonce + ";"

    $AuthorizationHeader += "signature=" + $Signature

    # Create IDictionary to hold request headers

    $Headers = @{}

    ## Calculate custom UA

    if($PSVersionTable.PSVersion.Major -ge 6){ #< 6 is missing the OS member of PSVersionTable, so we use env variables

        $UserAgent = "AkamaiPowershell/$($Env:AkamaiPowershellVersion) (Powershell $PSEdition $($PSVersionTable.PSVersion) $PSCulture, $($PSVersionTable.OS))"

    }

    else{

        $UserAgent = "AkamaiPowershell/$($Env:AkamaiPowershellVersion) (Powershell $PSEdition $($PSVersionTable.PSVersion) $PSCulture, $($Env:OS))"

    }

    # Add headers

    $Headers.Add('Authorization',$AuthorizationHeader)

    $Headers.Add('Accept','application/json')

    $Headers.Add('Content-Type', 'application/json; charset=utf-8')

    $Headers.Add('User-Agent', $UserAgent)

    # Add additional headers

    if ($AdditionalHeaders) {

        $AdditionalHeaders.Keys | ForEach-Object {

            $Headers[$_] = $AdditionalHeaders[$_]

        }

    }

    # Set ContentType param from Content-Type header. This is sent along with bodies to fix string encoding issues in IRM

    $ContentType = $Headers['Content-Type']

    # Add additional headers if POSTing or PUTing

    If ($Body) {

        # turn off the "Expect: 100 Continue" header

        # as it's not supported on the Akamai side.

        [System.Net.ServicePointManager]::Expect100Continue = $false

    }

    # Set TLS version to 1.2

    [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]::Tls12

    $params = @{

        Method = $Method

        Uri = $ReqURL

        Headers = $Headers

        ContentType =  $ContentType

    }

    if ($null -ne $ENV:https_proxy) { $params.Proxy = $ENV:https_proxy }

    if ($Method -in "PUT","POST","PATCH") {

        if ($Body) { $params.Body = $Body }

        if ($InputFile) { $params.InFile = $InputFile }

    }

    # GET requests typically

    else { 

        $params.MaximumRedirection = 0

        # Differentiate on PS 5 and later as PS 5's Invoke-RestMethod doesn't behave the same as the later versions

        if ($PSVersionTable.PSVersion.Major -le 5) {

            $params.ErrorAction = "SilentlyContinue"

        }

        else {

            $params.ErrorAction = "Stop"

            $params.ResponseHeadersVariable = $ResponseHeadersVariable

        }

    }

    if($OutputFile){

        $params.OutFile = $OutputFile

    }

    try {

        $Response = Invoke-RestMethod @params

    }

    catch {

        # PS >=6 handling

        # Redirects aren't well handled due to signatures needing regenerated

        if ($_.Exception.Response.StatusCode.value__ -eq 301 -or $_.Exception.Response.StatusCode.value__ -eq 302) {

            try {

                $NewPath = $_.Exception.Response.Headers.Location.PathAndQuery

                Write-Debug "Redirecting to $NewPath"

                $Response = Invoke-AkamaiRestMethod -Method $Method -Path $NewPath -AdditionalHeaders $AdditionalHeaders -EdgeRCFile $EdgeRCFile -Section $Section -ResponseHeadersVariable $ResponseHeadersVariable -AccountSwitchKey $AccountSwitchKey

            }

            catch {

                throw $_

            }

        }

        else {

            throw $_

        }

    }

    # PS <5 handling

    if ($null -ne ($Response.PSObject.members | Where-Object { $_.Name -eq "redirectLink" }) -and $method -notin "PUT","POST","PATCH") {

        try {

            Write-Debug "Redirecting to $($Response.redirectLink)"

            $Response = Invoke-AkamaiRestMethod -Method $Method -Path $Response.redirectLink -AdditionalHeaders $AdditionalHeaders -EdgeRCFile $EdgeRCFile -Section $Section -AccountSwitchKey $AccountSwitchKey

        }

        catch {

            throw $_

        }

    }

    # Set ResponseHeadersVariable to be passed back to requesting function

    if ($ResponseHeadersVariable) {

        Set-Variable -name $ResponseHeadersVariable -Value (Get-Variable -Name $ResponseHeadersVariable -ValueOnly -ErrorAction SilentlyContinue) -Scope Script

    }

    Return $Response

}

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