# Copyright 2012 Aaron Jensen
# 
# 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.

function Set-IisMimeMap
{
    <#
    .SYNOPSIS
    Creates or sets a file extension to MIME type map for an entire web server.
    
    .DESCRIPTION
    IIS won't serve static files unless they have an entry in the MIME map.  Use this function to create/update a MIME map entry.
    
    .LINK
    Get-IisMimeMap
    
    .LINK
    Remove-IisMimeMap
    
    .EXAMPLE
    Set-IisMimeMap -FileExtension '.m4v' -MimeType 'video/x-m4v'
    
    Adds a MIME map so that IIS will serve `.m4v` files as `video/x-m4v`.
    
    #>
    [CmdletBinding(SupportsShouldProcess=$true,DefaultParameterSetName='ForWebServer')]
    param(
        [Parameter(Mandatory=$true)]
        [string]
        # The file extension to set.
        $FileExtension,
        
        [Parameter(Mandatory=$true)]
        [string]
        # The MIME type to serve the files as.
        $MimeType
    )
    
    $staticContent = Get-IisConfigurationSection -SectionPath 'system.webServer/staticContent'
    $mimeMapCollection = $staticContent.GetCollection()
    
    $mimeMap = $mimeMapCollection | Where-Object { $_['fileExtension'] -eq $FileExtension }
    
    if( $mimeMap )
    {
        $action = 'setting'
        $mimeMap['fileExtension'] = $FileExtension
        $mimeMap['mimeType'] = $MimeType
    }
    else
    {
        $action = 'adding'
        $mimeMap = $mimeMapCollection.CreateElement("mimeMap");
        $mimeMap["fileExtension"] = $FileExtension
        $mimeMap["mimeType"] = $MimeType
        [void] $mimeMapCollection.Add($mimeMap)
    }
     
    if( $pscmdlet.ShouldProcess( 'IIS web server', ('{0} MIME map {1} -> {2}' -f $action,$FileExtension,$MimeType) ) )
    {
        Write-Host ('IIS: {0} MIME map: {1} -> {2}' -f $action,$FileExtension,$MimeType)
        $staticContent.CommitChanges()
    }
}