Public/Get-RemedyChange.ps1

Function Get-RemedyChange {
<#
.SYNOPSIS
    Retrieves BMC Remedy Change details via the API by ID number or other specified criteria such as Assignee, Customer, Team.
.DESCRIPTION
    This cmdlet queries the Remedy API for Changes as specified by ID number or by combining one or more of the filter parameters.
    Beware that the Remedy API will return a maximum of 5000 incidents in a single request. If you need to exceed this, make multiple
    requests (e.g by separating by date range) and then combine the results.
.EXAMPLE
    Get-RemedyChange -ID 1234567
.EXAMPLE
    Get-RemedyChange -Status Open -Team Windows
.EXAMPLE
    Get-RemedyChange -Status Open -Customer 'Contoso'
.EXAMPLE
    Get-RemedyChange -Status Open -Team Windows -Customer 'Fabrikam'
.EXAMPLE
    Get-RemedyChange -Team Windows -After 01/15/2017 -Before 02/15/2017
#>

    [cmdletbinding()]
    Param(
        #One or more Change ID numbers.
        [Parameter(Position=0,ValueFromPipeline,ValueFromPipelineByPropertyName)]
        [String[]]$ID = '',
        
        #Changes assigned to the specified team.
        [String]$Team,
        
        #Changes raised by the specified customer.
        [String]$Customer,
        
        #Changes raised for a specific configuration item, e.g a server or other device.
        [Alias('CI')]
        [String]$ConfigurationItem,
        
        #Changes assigned to the specified individual.
        [String[]]$Assignee,

        #Changes submitted by the specified individual.
        [String[]]$Submitter,

        #Changes filtered by specified status. You can also specific 'AllOpen' or 'AllClosed': AllOpen = ('Draft','Request For Authorization','Request For Change','Planning In Progress','Scheduled For Review','Scheduled For Approval','Scheduled','Implementation In Progress','Pending','Rejected'); AllClosed = ('Completed','Closed','Cancelled')
        [ValidateSet('AllOpen','AllClosed','Draft','Request For Authorization','Request For Change','Planning In Progress','Scheduled For Review','Scheduled For Approval','Scheduled','Implementation In Progress','Pending','Rejected','Completed','Closed','Cancelled')] 
        [String]$Status,
        
        [ValidateSet('Pending','Approved','Rejected','')]
        [String[]]$ApprovalStatus,

        #Include Changes of one or more specific types: Normal, Standard, Expedited.
        [ValidateSet('Normal','Standard','Expedited','Emergency','Latent','No Impact','')]
        [String[]]$Type,

        #Exclude Changes of one or more specific types: Normal, Standard, Expedited.
        [ValidateSet('Normal','Standard','Expedited','Emergency','Latent','No Impact','')]
        [String[]]$ExcludeType,

        #Include Changes of one or more specific priorities: Low, Medium, High, Critical.
        [ValidateSet('Low','Medium','High','Critical','')]
        [String[]]$Priority = '',
        
        #Changes with a 'scheduled start date' that is after this date. Use US date format: mm/dd/yyyy
        [DateTime]$After,
        
        #Changes with a 'scheduled start date' that is before this date. Use US date format: mm/dd/yyyy
        [DateTime]$Before,

        #Return all available data fields from Remedy.
        [Switch]$Full,

        #Match the string exactly.
        [Switch]$Exact,

        #An encoded string representing your Remedy Credentials as generated by the Set-RemedyApiConfig cmdlet.
        [String]$EncodedCredentials = (Get-RemedyApiConfig).Credentials,

        #The Remedy API URL. E.g: https://<localhost>:<port>/api
        [String]$APIURL = (Get-RemedyApiConfig).APIURL
    )
    
    If (-not $EncodedCredentials -or -not $APIURL) { Throw 'Remedy API Config not set. Set-RemedyApiConfig first.' }
    
    If (-not (Test-RemedyApiConfig)) { Throw 'Remedy API Test failed. Ensure the config has been set correctly via Set-RemedyApiConfig.' }

    Switch ($Status) {
        'AllOpen'   { $Filter = 'Draft','Request For Authorization','Request For Change','Planning In Progress','Scheduled For Review','Scheduled For Approval','Scheduled','Implementation In Progress','Pending','Rejected' }
        'AllClosed' { $Filter = 'Completed','Closed','Cancelled' }
        Default     { $Filter = $Status }  
    }
    
    If ($Filter) { $StatusString = ($Filter | ForEach-Object { "('Change Request Status'=""$_"")" }) -join 'OR' }
    
    If ($ApprovalStatus) { $ApprovalStatusString = ($ApprovalStatus | ForEach-Object { "('Approval Status'=""$_"")" }) -join 'OR' }

    If ($Type)           { $TypeString = ($Type | ForEach-Object { "('Change Timing'=""$_"")" }) -join 'OR' }
    If ($ExcludeType)    { $ExcludeTypeString = ($ExcludeType | ForEach-Object { "('Change Timing'!=""$_"")" }) -join 'AND' }
    
    If ($Priority) { $PriorityString = ($Priority | ForEach-Object { "('Priority'=""$_"")" }) -join 'OR' }
     
    ForEach ($IDNum in $ID) {
        Write-Verbose "$IDNum"
        
        $Filter = @()
        
        If ($Exact) { $Op = '='; $Wc = '' } Else { $Op = 'LIKE'; $Wc = '%25' }
        If ($Exact -or $IDNum -match '^CRQ\d{12}') { $IDOp = '='; $IDWc = '' } Else { $IDOp = 'LIKE'; $IDWc = '%25' }
        
        If ($IDNum)    { $Filter += "'Infrastructure Change ID'$IDOp""$IDWc$IDNum""" }
        If ($Team)     { $Filter += "'ASGRP'=""$Team""" }
        If ($Customer) { $Filter += "'Customer Company'$Op""$Wc$Customer$Wc""" }
        If ($ConfigurationItem) { $Filter += "'zTmp_CIName'$Op""$Wc$ConfigurationItem$Wc""" }
        
        If ($Assignee -is [Array]) { 
            $AssigneeString = ($Assignee | ForEach-Object { "('ASCHG'$Op""$Wc$_$Wc"")" }) -join 'OR'
            $Filter += "($AssigneeString)"
        } ElseIf ($Assignee -is [String]) {
             $Filter += "'ASCHG'$Op""$Wc$Assignee$Wc""" 
        }
        
        If ($Submitter -is [Array]) { 
            $SubmitterString = ($Submitter | ForEach-Object { "('Submitter'$Op""$Wc$_$Wc"")" }) -join 'OR'
            $Filter += "($SubmitterString)"
        } ElseIf ($Submitter -is [String]) {
             $Filter += "'Submitter'$Op""$Wc$Submitter$Wc""" 
        }
        
        If ($ApprovalStatus){ $Filter += "($ApprovalStatusString)" }
        
        If ($Type)          { $Filter += "($TypeString)" }
        If ($ExcludeType)   { $Filter += "($ExcludeTypeString)" }
        
        If ($Priority)      { $Filter += "($PriorityString)" }
        
        If ($After)  { $Filter += "'Scheduled Start Date'>""$($After.ToString("yyyy-MM-dd"))""" }
        If ($Before) { $Filter += "'Scheduled Start Date'<""$($Before.ToString("yyyy-MM-dd"))""" }

        If ($StatusString) { $Filter += "($StatusString)" }
        $FilterString = $Filter -Join 'AND'

        $Headers = @{
            Authorization = "Basic $EncodedCredentials"
        }

        If (-not $FilterString) { Throw 'Please provide at least one search criteria. Enter Help Get-RemedyChange for further guidance.' }

        $URL = "$APIURL/CHG:Infrastructure Change/$FilterString"
    
    
        Try {
            $Result = Invoke-RestMethod -URI $URL -Headers $Headers -ErrorAction Stop

            $Changes = @()
            $Result.PSObject.Properties | ForEach-Object { $Changes += $_.Value }
            
            #Convert all date containing fields to PS datetime
            ForEach ($Change in $Changes) { 
                
                $Change.PSObject.Properties.Name -like '* Date*' | ForEach-Object {
                        
                    If ($Change.$_ -match 'UTC'){
                        $Change.$_ = [datetime]::ParseExact(($Change.$_ -Replace 'UTC ',''), 'ddd MMM dd HH:mm:ss yyyy', $null)
                    }
                }
            }
                                
            #Could replace this with a format.ps1.xml
            If (-not $Full){
                $Changes = $Changes |  Select-Object 'Infrastructure Change ID','Priority',@{N='Customer';E={$_.'Customer Company'}},
                                                     'Description',@{N='Status';E={$_.'Change Request Status'}},@{N='Assigned Group';E={$_.ASGRP}},@{N='Assignee';E={$_.ASCHG}},@{N='CI';E={$_.zTmp_CIName}},
                                                     'Scheduled Start Date','Scheduled End Date','Last Modified By','Last Modified Date'
            }
        } Catch {
            
            Write-Error "Error: $_"
        }

        If ($null -ne $Changes.'Infrastructure Change ID') {
            $Changes.psobject.TypeNames.Insert(0, 'RemedyChange')
            $Changes
        } Else {
            Write-Verbose 'No change data returned'
        }
    }
}