add Get-MatrixRoomMessages

PSMatrix.psd1

@@ -74,7 +74,8 @@ FunctionsToExport = @(
     'Remove-MatrixAccessToken',
     'Get-MatrixJoinedRooms',
     'Get-MatrixJoinedMembers',
-    'Get-MatrixRoomId'
+    'Get-MatrixRoomId',
+    'Get-MatrixRoomMessages'
 )
 
 # Cmdlets to export from this module, for best performance, do not use wildcards and do not delete the entry, use an empty array if there are no cmdlets to export.

public/Get-MatrixRoomMessages.ps1

@@ -0,0 +1,77 @@
+function Get-MatrixRoomMessages {
+    param(
+        [Parameter(Mandatory)]
+        [string]$ServerUrl,
+
+        [Parameter(Mandatory)]
+        [SecureString]$AccessToken,
+
+        [Parameter(Mandatory)]
+        [string]$UserId,
+
+        [Parameter(Mandatory)]
+        [string]$RoomId,
+
+        [Parameter(Mandatory = $false)]
+        [int]$Limit = 50
+    )
+
+    Write-Debug "URL: $url"
+    $headers = Get-MatrixAuthHeaders -AccessToken $AccessToken
+
+    try {
+        $filterUrl = New-MatrixUrl -ServerUrl $ServerUrl -ApiPath "_matrix/client/v3/user/$UserId/filter"
+        $filter = [PSCustomObject]@{
+            room = @{
+                rooms = @(
+                    $RoomId
+                )
+                timeline = @{
+                    limit = $Limit
+                    rooms = @(
+                        $RoomId
+                    )
+                    types = @(
+                        "m.room.message"
+                    )
+                }
+            }
+        } | ConvertTo-Json -Depth 3
+
+        $filterRes = Invoke-RestMethod -Uri $filterUrl -Method "POST" -Headers $headers -Body $filter
+    } catch {
+        Write-Error $_
+        return
+    }
+
+    try {
+        $filterId = $filterRes.filter_id
+        $url = New-MatrixUrl -ServerUrl $ServerUrl `
+            -ApiPath ("_matrix/client/v3/sync" `
+            + "?filter=$filterId" `
+            + "&full_state=true&set_presence=offline")
+
+        $res = Invoke-RestMethod -Uri $url -Headers $headers
+    } catch {
+        Write-Error $_
+    }
+
+    $events = $res.rooms.join.($RoomId).timeline.events
+
+    $formattedEvents = @()
+
+    $events | ForEach-Object {
+        $formattedEvent = [PSCustomObject]@{
+            EventID = $_.event_id
+            Sender = $_.sender
+            Body = $_.content.body
+            Format = $_.content.format
+            FormattedBody = $_.content.formatted_body
+            MsgType = $_.content.msgtype
+        }
+
+        $formattedEvents += $formattedEvent
+    }
+
+    return $formattedEvents
+}