Public/Core/Clear-EntraOpsCache.ps1

<#
.SYNOPSIS
    Resets the local cache of Graph API calls. Use this if you need to force a refresh of the cache in the current session.
 
.DESCRIPTION
    By default all graph responses are cached and re-used for the duration of the session.
    Use this function to clear the cache and force a refresh of the data from Microsoft Graph.
    This function has been written by Merill Fernando as part of Maester Framework.
 
.PARAMETER CacheType
    Type of cache to clear. Options: All (default), Memory, Persistent, Expired
 
.PARAMETER Pattern
    Optional URI pattern to selectively clear cache entries (supports wildcards)
 
.EXAMPLE
    This example clears all cache of Graph API calls in EntraOps.
    Clear-EntraOpsCache
 
.EXAMPLE
    This example clears only expired cache entries.
    Clear-EntraOpsCache -CacheType Expired
 
.EXAMPLE
    This example clears cache for role-related endpoints only.
    Clear-EntraOpsCache -Pattern "*roleManagement*"
#>


function Clear-EntraOpsCache {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $false)]
        [ValidateSet("All", "Memory", "Persistent", "Expired")]
        [string]$CacheType = "All",
        
        [Parameter(Mandatory = $false)]
        [string]$Pattern = "*"
    )
    
    $UsesPersistentCache = $CacheType -in @('All', 'Persistent')
    $IsSuspiciousPath = $false
    if ($UsesPersistentCache) {
        # SAFETY CHECK: Ensure we are operating on the expected EntraOps cache directory
        if ([string]::IsNullOrEmpty($__EntraOpsSession.PersistentCachePath)) {
            Write-Error "Persistent cache path is not defined. Aborting to prevent accidental data loss."
            return
        }

        # Normalize path separators for comparison
        $NormalizedPath = $__EntraOpsSession.PersistentCachePath.Replace('\', '/').TrimEnd('/')
        $IsSuspiciousPath = -not ($NormalizedPath.EndsWith("EntraOps") -or $NormalizedPath.EndsWith(".cache/EntraOps"))

        if ($IsSuspiciousPath) {
            Write-Warning "Cache path '$($__EntraOpsSession.PersistentCachePath)' does not end with 'EntraOps'. Executing extra safety checks..."
            # This prevents cleaning generic folders if configuration is wrong.
        }
    }
    
    $ClearedCount = 0
    
    switch ($CacheType) {
        "Expired" {
            Write-Verbose "Clearing expired cache entries matching pattern: $Pattern"
            $CurrentTime = [DateTime]::UtcNow
            $KeysToRemove = @()

            [System.Threading.Monitor]::Enter($__EntraOpsSession.GraphCache.SyncRoot)
            try { $GraphCacheKeys = @($__EntraOpsSession.GraphCache.Keys) } finally { [System.Threading.Monitor]::Exit($__EntraOpsSession.GraphCache.SyncRoot) }
            foreach ($Key in $GraphCacheKeys) {
                if ($Key -like $Pattern -and $__EntraOpsSession.CacheMetadata.ContainsKey($Key)) {
                    $ExpiryTime = $__EntraOpsSession.CacheMetadata[$Key].ExpiryTime
                    if ($CurrentTime -gt $ExpiryTime) {
                        $KeysToRemove += $Key
                    }
                }
            }
            
            foreach ($Key in $KeysToRemove) {
                $__EntraOpsSession.GraphCache.Remove($Key)
                $__EntraOpsSession.CacheMetadata.Remove($Key)
                $ClearedCount++
            }
            Write-Verbose "Cleared $ClearedCount expired cache entries"
        }
        
        "Memory" {
            Write-Verbose "Clearing memory cache matching pattern: $Pattern"
            [System.Threading.Monitor]::Enter($__EntraOpsSession.GraphCache.SyncRoot)
            try { $GraphCacheKeys = @($__EntraOpsSession.GraphCache.Keys) } finally { [System.Threading.Monitor]::Exit($__EntraOpsSession.GraphCache.SyncRoot) }
            $KeysToRemove = @($GraphCacheKeys | Where-Object { $_ -like $Pattern })
            
            foreach ($Key in $KeysToRemove) {
                $__EntraOpsSession.GraphCache.Remove($Key)
                $__EntraOpsSession.CacheMetadata.Remove($Key)
                $ClearedCount++
            }
            Write-Verbose "Cleared $ClearedCount memory cache entries"
        }

        "Persistent" {
            Write-Verbose "Clearing persistent cache files matching pattern: $Pattern"
            if (Test-Path $__EntraOpsSession.PersistentCachePath) {
                $Files = Get-ChildItem -Path $__EntraOpsSession.PersistentCachePath -Filter "*.json" | Where-Object { $_.Name -like "*$Pattern*" }
                
                # Safety Filter for Suspicious Paths
                if ($IsSuspiciousPath) {
                    Write-Verbose "Applying strict filename filter (Base64 check) due to non-standard cache path."
                    $Files = $Files | Where-Object { $_.Name -match '^[a-zA-Z0-9\+/=]+\.json$' }
                }

                foreach ($File in $Files) {
                    Remove-Item -Path $File.FullName -Force
                    $ClearedCount++
                }
            }
            Write-Verbose "Cleared $ClearedCount persistent cache files"
        }
        
        "All" {
            Write-Verbose "Clearing all cache (memory and persistent) matching pattern: $Pattern"
            
            # Clear memory cache
            [System.Threading.Monitor]::Enter($__EntraOpsSession.GraphCache.SyncRoot)
            try { $GraphCacheKeys = @($__EntraOpsSession.GraphCache.Keys) } finally { [System.Threading.Monitor]::Exit($__EntraOpsSession.GraphCache.SyncRoot) }
            $KeysToRemove = @($GraphCacheKeys | Where-Object { $_ -like $Pattern })
            foreach ($Key in $KeysToRemove) {
                $__EntraOpsSession.GraphCache.Remove($Key)
                $__EntraOpsSession.CacheMetadata.Remove($Key)
                $ClearedCount++
            }
            
            # Clear persistent cache
            if (Test-Path $__EntraOpsSession.PersistentCachePath) {
                try {
                    $Files = Get-ChildItem -Path $__EntraOpsSession.PersistentCachePath -Filter "*.json" -ErrorAction Stop | Where-Object { $_.Name -like "*$Pattern*" }
                    
                    # Safety Filter for Suspicious Paths
                    if ($IsSuspiciousPath) {
                        Write-Verbose "Applying strict filename filter (Base64 check) due to non-standard cache path."
                        $Files = $Files | Where-Object { $_.Name -match '^[a-zA-Z0-9\+/=]+\.json$' }
                    }

                    foreach ($File in $Files) {
                        try {
                            Remove-Item -Path $File.FullName -Force -ErrorAction SilentlyContinue
                            $ClearedCount++
                        } catch {
                            Write-Verbose "Failed to remove cache file $($File.FullName): $_"
                        }
                    }
                } catch {
                    Write-Warning "Failed to access persistent cache at $($__EntraOpsSession.PersistentCachePath): $_"
                }
            }
            Write-Verbose "Cleared total of $ClearedCount cache entries"
        }
    }
    
    if ($ClearedCount -eq 0) {
        Write-Verbose "No cache entries found matching pattern: $Pattern"
    } else {
        Write-Host "Cleared $ClearedCount cache entries"
    }
}
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