Compare files hash from two different SharePoint tenants

# Connect to the first tenant
$Connection1 = Connect-PnPOnline -Url "https://[TenantName1].sharepoint.com/sites/[siteName1]" -Interactive -ReturnConnection
$file1 = Get-PnPFile -Url "/Shared%20Documents/document.docx" -AsMemoryStream -Connection $Connection1

# Connect to the first tenant
$Connection2 = Connect-PnPOnline -Url "https://[TenantName2].sharepoint.com/sites/[siteName2]" -Interactive -ReturnConnection
$file2 = Get-PnPFile -Url "/Shared%20Documents/document.docx" -AsMemoryStream -Connection $Connection2


# Compare the hash of the two files
$hash1 = $(Get-FileHash -InputStream $file1).Hash
$hash2 = $(Get-FileHash -InputStream $file2).Hash

# Output the results of the comparison
if ($hash1 -eq $hash2) {
    Write-Host "The two files have the same hash."
} else {
    Write-Host "The two files have different hashes."
}

[CmdletBinding()]
param(
    [Parameter(Mandatory, HelpMessage = "URL of the site in first tenant")]
    [string]$WebUrl1,
    
    [Parameter(Mandatory, HelpMessage = "Server-relative URL of the file in first tenant")]
    [string]$FileUrl1,
    
    [Parameter(Mandatory, HelpMessage = "URL of the site in second tenant")]
    [string]$WebUrl2,
    
    [Parameter(HelpMessage = "Server-relative URL of the file in second tenant (defaults to same as FileUrl1)")]
    [string]$FileUrl2,
    
    [Parameter(HelpMessage = "Name for the first tenant connection (defaults to 'tenant1')")]
    [string]$Connection1Name = "tenant1",
    
    [Parameter(HelpMessage = "Name for the second tenant connection (defaults to 'tenant2')")]
    [string]$Connection2Name = "tenant2"
)

begin {
    if ([string]::IsNullOrEmpty($FileUrl2)) {
        $FileUrl2 = $FileUrl1
    }
    
    Write-Host "Setting up connections to both tenants..." -ForegroundColor Cyan
    
    Write-Host "Logging in to first tenant ($WebUrl1)..." -ForegroundColor Cyan
    m365 login --connectionName $Connection1Name
    if ($LASTEXITCODE -ne 0) {
        throw "Failed to login to first tenant"
    }
    
    Write-Host "Logging in to second tenant ($WebUrl2)..." -ForegroundColor Cyan
    m365 login --connectionName $Connection2Name
    if ($LASTEXITCODE -ne 0) {
        throw "Failed to login to second tenant"
    }
    
    $tempDir = Join-Path $env:TEMP "CompareFiles-$(Get-Date -Format 'yyyyMMddHHmmss')"
    New-Item -ItemType Directory -Path $tempDir -Force | Out-Null
    $tempFile1 = Join-Path $tempDir "file1.tmp"
    $tempFile2 = Join-Path $tempDir "file2.tmp"
}

process {
    try {
        Write-Host "`nSwitching to first tenant connection..." -ForegroundColor Cyan
        m365 connection use --name $Connection1Name | Out-Null
        if ($LASTEXITCODE -ne 0) {
            throw "Failed to switch to first tenant connection"
        }
        
        Write-Host "Downloading file from first tenant: $FileUrl1" -ForegroundColor Cyan
        $result1 = m365 spo file get --webUrl $WebUrl1 --url $FileUrl1 --asFile --path $tempFile1 2>&1
        if ($LASTEXITCODE -ne 0) {
            throw "Failed to download file from first tenant: $result1"
        }
        
        Write-Host "`nSwitching to second tenant connection..." -ForegroundColor Cyan
        m365 connection use --name $Connection2Name | Out-Null
        if ($LASTEXITCODE -ne 0) {
            throw "Failed to switch to second tenant connection"
        }
        
        Write-Host "Downloading file from second tenant: $FileUrl2" -ForegroundColor Cyan
        $result2 = m365 spo file get --webUrl $WebUrl2 --url $FileUrl2 --asFile --path $tempFile2 2>&1
        if ($LASTEXITCODE -ne 0) {
            throw "Failed to download file from second tenant: $result2"
        }
        
        Write-Host "`nCalculating file hashes..." -ForegroundColor Cyan
        $hash1 = (Get-FileHash -Path $tempFile1 -Algorithm SHA256).Hash
        $hash2 = (Get-FileHash -Path $tempFile2 -Algorithm SHA256).Hash
        
        Write-Host "`nComparison Results:" -ForegroundColor White
        Write-Host "==================" -ForegroundColor White
        Write-Host "File 1 ($Connection1Name): $FileUrl1" -ForegroundColor Gray
        Write-Host "Hash 1: $hash1" -ForegroundColor Gray
        Write-Host "`nFile 2 ($Connection2Name): $FileUrl2" -ForegroundColor Gray
        Write-Host "Hash 2: $hash2" -ForegroundColor Gray
        
        Write-Host "`nResult: " -NoNewline
        if ($hash1 -eq $hash2) {
            Write-Host "Files are IDENTICAL" -ForegroundColor Green
        } else {
            Write-Host "Files are DIFFERENT" -ForegroundColor Red
        }
    } finally {
        if (Test-Path $tempDir) {
            Remove-Item -Path $tempDir -Recurse -Force
        }
    }
}

# Example 1: Compare same file across two tenants
# .\Compare-Files.ps1 -WebUrl1 "https://contoso.sharepoint.com/sites/Site1" -FileUrl1 "/Shared Documents/document.docx" -WebUrl2 "https://fabrikam.sharepoint.com/sites/Site2" -Connection1Name "contoso" -Connection2Name "fabrikam"

# Example 2: Compare different file paths
# .\Compare-Files.ps1 -WebUrl1 "https://contoso.sharepoint.com/sites/Site1" -FileUrl1 "/Shared Documents/doc1.pdf" -WebUrl2 "https://fabrikam.sharepoint.com/sites/Site2" -FileUrl2 "/Documents/doc2.pdf"

# Example 3: Compare with default connection names (tenant1, tenant2)
# .\Compare-Files.ps1 -WebUrl1 "https://contoso.sharepoint.com/sites/Site1" -FileUrl1 "/Shared Documents/report.xlsx" -WebUrl2 "https://fabrikam.sharepoint.com/sites/Site2"