[Change Safety] Az.Cdn: opt-in + fix dynamicparam forwarding for custom-fronted profile cmdlets by YangAn-microsoft · Pull Request #29999 · Azure/azure-powershell

YangAn-microsoft · 2026-08-12T14:39:33Z

Summary

Opts Az.Cdn into Change Safety (-AcquirePolicyToken / -ChangeReference) and fixes a generator gap that prevented these parameters from binding on the custom-fronted CDN/AFD profile cmdlets.

What's included

enable-change-safety: true opt-in for the Cdn AutoRest project (profiles + AFD endpoints).
Hand-added dynamicparam blocks on the 6 custom-fronted profile cmdlets (New/Remove/Update-Az{,FrontDoor}CdnProfile) forwarding the wrapped private cmdlet's dynamic parameters.
A generator-level fix (see companion PR Fix change-safety dynamicparam forwarding for custom-fronted cmdlets autorest.powershell#1555), applied here via full regeneration: the outer public proxy for custom-fronted cmdlets now actually emits its own dynamicparam forwarding block, so the inner block added in (2) is reachable. Previously the outer proxy rejected -AcquirePolicyToken before ever dispatching to the custom function.
Live test coverage (src/Cdn/LiveTests/Cdn.Autorest/TestLiveScenarios.ps1) for both custom-fronted cmdlets (New-AzCdnProfile, New-AzFrontDoorCdnProfile) and generated, non-custom-fronted cmdlets (New-AzFrontDoorCdnEndpoint, New-AzFrontDoorCdnRuleSet), so a regression in either code path is caught going forward.

Validation — live test evidence

Tested against a real Azure subscription (f758ac53-3e63-4317-a956-0997793808d7, tenant 4f00b3b6-2940-4f2c-b037-94637c180d30) — not mocked/recorded.

New-AzFrontDoorCdnEndpoint -AcquirePolicyToken (generated cmdlet) — passed before this fix.
New-AzFrontDoorCdnProfile -AcquirePolicyToken (custom-fronted cmdlet) — failed before this fix, passes after.

Before the fix:

PS> New-AzFrontDoorCdnProfile -ResourceGroupName rg-cs-cdn-e2e -Name fdp-cs-13865 -SkuName Standard_AzureFrontDoor -Location Global -AcquirePolicyToken -Confirm:$false
New-AzFrontDoorCdnProfile: A parameter cannot be found that matches parameter name 'AcquirePolicyToken'.

Confirmed root cause — the outer public proxy had no dynamicparam block at all:

PS> (Get-Command New-AzFrontDoorCdnProfile).ScriptBlock.Ast.Body.DynamicParamBlock -eq $null
True

After the fix (rebuilt Az.Cdn.private.dll with the generator change, regenerated exports/*.ps1):

PS> (Get-Command New-AzFrontDoorCdnProfile).ScriptBlock.Ast.Body.DynamicParamBlock -ne $null
True

PS> New-AzResourceGroup -Name rg-cs-cdn-e2e-v2 -Location 'West US' -Force
PS> New-AzFrontDoorCdnProfile -ResourceGroupName rg-cs-cdn-e2e-v2 -Name csv2profile -SkuName Standard_AzureFrontDoor -Location Global -AcquirePolicyToken -Confirm:$false
SUCCESS: csv2profile

The profile was created successfully end-to-end, confirming -AcquirePolicyToken now binds and the change-safety token acquisition path executes.

Deeper verification — proof the token acquisition pipeline actually fired

Binding the parameter and getting a successful create doesn't, by itself, prove ARM ever received the policy token — the write could succeed either way on a subscription that doesn't mandate it. For AutoRest-generated cmdlets this pipeline hook (ContextAdapter.AddChangeSafetyPolicyTokenHandler) has no built-in -Debug observability (unlike the SDK/RM cmdlet path), so a temporary, env-var-gated trace was added to PolicyTokenAcquirer.StampPolicyTokenAsync's call site (reverted afterward, verified via clean git status) to get definitive proof:

[PolicyTokenAcquirer] Intercept PUT https://management.azure.com/subscriptions/.../resourceGroups/rg-cs-cdn-debug-test/providers/Microsoft.Cdn/profiles/csdebugtest85182?api-version=2026-04-01-preview
[PolicyTokenAcquirer] Payload prepared.
[PolicyTokenAcquirer] POST acquirePolicyToken https://management.azure.com/subscriptions/.../providers/Microsoft.Authorization/acquirePolicyToken?api-version=2025-03-01
[PolicyTokenAcquirer] Response 200 OK
[PolicyTokenAcquirer] Token acquired and header added.
[PolicyTokenAcquirer] Intercept GET https://management.azure.com/subscriptions/.../operationresults/...  (async operation poll)
[PolicyTokenAcquirer] Skip: verb not allowed for token acquisition.

This confirms: the outgoing PUT was intercepted, a real POST to ARM's acquirePolicyToken endpoint was made and returned 200 OK, the token was stamped onto the request as the x-ms-policy-external-evaluations header, and the subsequent async-poll GET was correctly skipped by the write-verb gate.

Additional live test — generated (non-custom-fronted) cmdlet

The scenarios above cover the two custom-fronted profile cmdlets. To also verify the code path that was never broken (plain generated cmdlets, which already had working dynamicparam forwarding before this PR), added and live-tested a new scenario against New-AzFrontDoorCdnRuleSet — a fully generated cmdlet with no custom/*.ps1 front:

PS> New-AzFrontDoorCdnProfile -ResourceGroupName rg-cs-cdn-ruleset-test -Name fdp63143 -SkuName Standard_AzureFrontDoor -Location Global -Confirm:$false
PS> New-AzFrontDoorCdnRuleSet -ResourceGroupName rg-cs-cdn-ruleset-test -ProfileName fdp63143 -Name ruleset63143 -AcquirePolicyToken -Confirm:$false
RESULT: SUCCESS ruleset63143

This gives explicit regression coverage for both the custom-fronted path (fixed by this PR) and the plain-generated path (already correct), so a future change that breaks either one will be caught by TestLiveScenarios.ps1.

Generator fix: Azure/autorest.powershell#1555

…ile cmdlets Regenerated Az.Cdn with the autorest.powershell generator fix (see Azure/autorest.powershell#1555): the outer proxy for custom-fronted write cmdlets (New/Remove/Update-Az{,FrontDoor}CdnProfile) now forwards the wrapped custom function's dynamicparam block, so -AcquirePolicyToken and -ChangeReference actually bind on these commands. Previously they were rejected with 'A parameter cannot be found that matches parameter name AcquirePolicyToken', even though the module was already opted into enable-change-safety. Live-validated: New-AzFrontDoorCdnProfile -AcquirePolicyToken now successfully creates a profile in a real subscription.

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azure-pipelines · 2026-08-12T14:39:49Z

Azure Pipelines: Successfully started running 1 pipeline(s). There may be pipelines that require an authorized user to comment /azp run to run.

Aditya Pujara (a0x1ab) · 2026-08-12T14:41:21Z

/azp run

azure-pipelines · 2026-08-12T14:41:37Z

Azure Pipelines: Successfully started running 3 pipeline(s).

The manual regeneration used to apply the change-safety dynamicparam fix pointed -ExamplesFolder at generated/Cdn/Cdn.Autorest/examples, which does not exist (the real, hand-maintained example .md files live at src/Cdn/Cdn.Autorest/examples). Export-ProxyCmdlet found no matching example for any cmdlet and fell back to the '{{ Add code here }}' placeholder in every exported cmdlet's comment-based help. Re-ran the regeneration with the correct examples path to restore the real examples; the change-safety dynamicparam fix is unaffected.

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Aditya Pujara (a0x1ab) · 2026-08-13T02:53:03Z

/azp run

azure-pipelines · 2026-08-13T02:53:18Z

Azure Pipelines: Successfully started running 3 pipeline(s).

The bare autorest run in the earlier regeneration (68ff900) reset src/Cdn/Cdn.Autorest/Properties/AssemblyInfo.cs's AssemblyVersion/ AssemblyFileVersion from the real released 6.0.2 to AutoRest's default placeholder 0.1.0.0. The generated/ copy (the one actually compiled into the shipped Az.Cdn.private.dll) was unaffected and still correctly says 6.0.2; this only restores the stray src/ copy so it doesn't poison a future regeneration cycle.

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The regeneration used the local autorest.powershell generator (via a directory junction into the AutoRest extension cache) instead of the officially published @autorest/powershell@4.0.754 npm package that CI uses. The generator embeds its own source file path into a diagnostic comment (a limitation note about deserializeFromResponse and headers), so this comment picked up my local dev machine's absolute path instead of the original CI path. Purely cosmetic/non-functional; reverted to keep the diff free of unrelated, machine-specific noise.

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Aditya Pujara (a0x1ab) · 2026-08-13T03:52:59Z

/azp run

azure-pipelines · 2026-08-13T03:53:14Z

Azure Pipelines: Successfully started running 3 pipeline(s).

…dlet New-AzFrontDoorCdnRuleSet has no custom/*.ps1 front, so its dynamicparam forwarding was already working before this PR's fix (only the custom-fronted profile cmdlets were broken). Adding this scenario alongside the existing custom-fronted ones gives explicit regression coverage for both code paths going forward. Live-validated: created a real Front Door rule set end-to-end with -AcquirePolicyToken in the BAMI tenant.

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Aditya Pujara (a0x1ab) · 2026-08-13T04:29:47Z

/azp run

azure-pipelines · 2026-08-13T04:30:03Z

Azure Pipelines: Successfully started running 3 pipeline(s).

Aditya Pujara (a0x1ab) · 2026-08-13T05:36:58Z

/azp run

azure-pipelines · 2026-08-13T05:37:13Z

Azure Pipelines: Successfully started running 3 pipeline(s).

azure-pipelines · 2026-08-13T05:42:14Z

Azure Pipelines: Successfully started running 1 pipeline(s). There may be pipelines that require an authorized user to comment /azp run to run.

… cmdlets, not just profile cmdlets

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Aditya Pujara (a0x1ab) · 2026-08-13T05:58:09Z

/azp run

azure-pipelines · 2026-08-13T05:58:25Z

Azure Pipelines: Successfully started running 3 pipeline(s).

…(matches Aks/ContainerRegistry/EventHub/ServiceBus)

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Aditya Pujara (a0x1ab) · 2026-08-13T06:22:07Z

/azp run

azure-pipelines · 2026-08-13T06:22:25Z

Azure Pipelines: Successfully started running 3 pipeline(s).

…dn migration/route/sku cmdlets

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Aditya Pujara (a0x1ab) · 2026-08-13T06:47:06Z

/azp run

azure-pipelines · 2026-08-13T06:47:22Z

Azure Pipelines: Successfully started running 3 pipeline(s).

…hive-bot regenerates separately)

github-actions · 2026-08-13T23:52:58Z

‼️ DO NOT MERGE THIS PR ‼️
This PR was labeled "Do Not Merge" because it contains code change that cannot be merged. Please contact the reviewer for more information.

Aditya Pujara (a0x1ab) · 2026-08-13T23:58:22Z

/azp run

azure-pipelines · 2026-08-13T23:58:38Z

Azure Pipelines: Successfully started running 3 pipeline(s).

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Pull request overview

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Suppressed comments (16)

src/Cdn/LiveTests/Cdn.Autorest/TestLiveScenarios.ps1:44

This scenario creates the prerequisite Front Door CDN profile without -AcquirePolicyToken. If Change Safety is required in the test subscription, the profile creation can fail before the ruleset cmdlet under test is exercised.

    New-AzFrontDoorCdnProfile -ResourceGroupName $rgName -Name $profileName -SkuName Standard_AzureFrontDoor -Location Global -Confirm:$false | Out-Null

src/Cdn/Cdn/ChangeLog.md:22

The Upcoming Release entry is too vague and uses inconsistent terminology ("ChangeSafety" vs "Change Safety"). Changelog entries here should be user-facing and should mention what changed (e.g., which parameters/cmdlets are impacted).

* Added ChangeSafety Support

src/Cdn/LiveTests/Cdn.Autorest/TestLiveScenarios.ps1:31

This scenario creates the prerequisite Front Door CDN profile without -AcquirePolicyToken. If Change Safety is required in the test subscription, the profile creation can fail before the endpoint cmdlet under test is exercised.

This issue also appears on line 44 of the same file.

    New-AzFrontDoorCdnProfile -ResourceGroupName $rgName -Name $profileName -SkuName Standard_AzureFrontDoor -Location Global -Confirm:$false | Out-Null

src/Cdn/Cdn.Autorest/custom/New-AzCdnProfile.ps1:159

The dynamicparam forwarding assumes GetDynamicParameters() is non-null. IDynamicParameters.GetDynamicParameters() is allowed to return $null, which would throw during parameter binding. Capture the result and null-check before enumerating.

            $instance = [System.Activator]::CreateInstance($wrapped.ImplementingType)
            foreach ($entry in $instance.GetDynamicParameters().GetEnumerator()) {

src/Cdn/Cdn.Autorest/custom/New-AzFrontDoorCdnProfile.ps1:205

The dynamicparam forwarding assumes GetDynamicParameters() is non-null. IDynamicParameters.GetDynamicParameters() is allowed to return $null, which would throw during parameter binding. Capture the result and null-check before enumerating.

            $instance = [System.Activator]::CreateInstance($wrapped.ImplementingType)
            foreach ($entry in $instance.GetDynamicParameters().GetEnumerator()) {

src/Cdn/Cdn.Autorest/custom/Remove-AzFrontDoorCdnProfile.ps1:169

The dynamicparam forwarding assumes GetDynamicParameters() is non-null. IDynamicParameters.GetDynamicParameters() is allowed to return $null, which would throw during parameter binding. Capture the result and null-check before enumerating.

            $instance = [System.Activator]::CreateInstance($wrapped.ImplementingType)
            foreach ($entry in $instance.GetDynamicParameters().GetEnumerator()) {

src/Cdn/Cdn.Autorest/custom/Enable-AzFrontDoorCdnProfileMigration.ps1:133

The dynamicparam forwarding assumes GetDynamicParameters() is non-null. IDynamicParameters.GetDynamicParameters() is allowed to return $null, which would throw during parameter binding. Capture the result and null-check before enumerating.

            $instance = [System.Activator]::CreateInstance($wrapped.ImplementingType)
            foreach ($entry in $instance.GetDynamicParameters().GetEnumerator()) {

src/Cdn/Cdn.Autorest/custom/Invoke-AzCdnCommitProfileToAFDMigration.ps1:128

The dynamicparam forwarding assumes GetDynamicParameters() is non-null. IDynamicParameters.GetDynamicParameters() is allowed to return $null, which would throw during parameter binding. Capture the result and null-check before enumerating.

            $instance = [System.Activator]::CreateInstance($wrapped.ImplementingType)
            foreach ($entry in $instance.GetDynamicParameters().GetEnumerator()) {

src/Cdn/Cdn.Autorest/custom/New-AzFrontDoorCdnRoute.ps1:383

The dynamicparam forwarding assumes GetDynamicParameters() is non-null. IDynamicParameters.GetDynamicParameters() is allowed to return $null, which would throw during parameter binding. Capture the result and null-check before enumerating.

            $instance = [System.Activator]::CreateInstance($wrapped.ImplementingType)
            foreach ($entry in $instance.GetDynamicParameters().GetEnumerator()) {

src/Cdn/Cdn.Autorest/custom/Update-AzFrontDoorCdnProfile.ps1:230

The dynamicparam forwarding assumes GetDynamicParameters() is non-null. IDynamicParameters.GetDynamicParameters() is allowed to return $null, which would throw during parameter binding. Capture the result and null-check before enumerating.

            $instance = [System.Activator]::CreateInstance($wrapped.ImplementingType)
            foreach ($entry in $instance.GetDynamicParameters().GetEnumerator()) {

src/Cdn/Cdn.Autorest/custom/Move-AzCdnProfileToAFD.ps1:220

The dynamicparam forwarding assumes GetDynamicParameters() is non-null. IDynamicParameters.GetDynamicParameters() is allowed to return $null, which would throw during parameter binding. Capture the result and null-check before enumerating.

            $instance = [System.Activator]::CreateInstance($wrapped.ImplementingType)
            foreach ($entry in $instance.GetDynamicParameters().GetEnumerator()) {

src/Cdn/Cdn.Autorest/custom/Remove-AzCdnProfile.ps1:168

The dynamicparam forwarding assumes GetDynamicParameters() is non-null. IDynamicParameters.GetDynamicParameters() is allowed to return $null, which would throw during parameter binding. Capture the result and null-check before enumerating.

            $instance = [System.Activator]::CreateInstance($wrapped.ImplementingType)
            foreach ($entry in $instance.GetDynamicParameters().GetEnumerator()) {

src/Cdn/Cdn.Autorest/custom/Test-AzFrontDoorCdnProfileMigration.ps1:127

The dynamicparam forwarding assumes GetDynamicParameters() is non-null. IDynamicParameters.GetDynamicParameters() is allowed to return $null, which would throw during parameter binding. Capture the result and null-check before enumerating.

            $instance = [System.Activator]::CreateInstance($wrapped.ImplementingType)
            foreach ($entry in $instance.GetDynamicParameters().GetEnumerator()) {

src/Cdn/Cdn.Autorest/custom/Update-AzFrontDoorCdnProfileSku.ps1:153

The dynamicparam forwarding assumes GetDynamicParameters() is non-null. IDynamicParameters.GetDynamicParameters() is allowed to return $null, which would throw during parameter binding. Capture the result and null-check before enumerating.

            $instance = [System.Activator]::CreateInstance($wrapped.ImplementingType)
            foreach ($entry in $instance.GetDynamicParameters().GetEnumerator()) {

src/Cdn/Cdn.Autorest/custom/Start-AzFrontDoorCdnProfilePrepareMigration.ps1:181

The dynamicparam forwarding assumes GetDynamicParameters() is non-null. IDynamicParameters.GetDynamicParameters() is allowed to return $null, which would throw during parameter binding. Capture the result and null-check before enumerating.

            $instance = [System.Activator]::CreateInstance($wrapped.ImplementingType)
            foreach ($entry in $instance.GetDynamicParameters().GetEnumerator()) {

src/Cdn/Cdn.Autorest/custom/Update-AzCdnProfile.ps1:174

The dynamicparam forwarding assumes GetDynamicParameters() is non-null. IDynamicParameters.GetDynamicParameters() is allowed to return $null, which would throw during parameter binding. Capture the result and null-check before enumerating.

            $instance = [System.Activator]::CreateInstance($wrapped.ImplementingType)
            foreach ($entry in $instance.GetDynamicParameters().GetEnumerator()) {

YangAn-microsoft added 2 commits August 12, 2026 18:14

Change Safety: opt in Az.Cdn (profiles + AFD endpoints) and regenerate

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Fix change-safety dynamicparam forwarding for custom-fronted cmdlets Azure/autorest.powershell#1555

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Restore trailing newline in AssemblyInfo.cs

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Correct ChangeLog.md scope: change safety opt-in applies to all write…

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… cmdlets, not just profile cmdlets

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Align Cdn ChangeLog wording with established ChangeSafety convention …

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Fix Change Safety dynamicparam forwarding for 7 more custom-fronted C…

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…dn migration/route/sku cmdlets

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YangAn-microsoft added 2 commits August 14, 2026 09:51

Remove generated/ content from PR per contribution guidelines (CI arc…

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…hive-bot regenerates separately)

Bump Cdn.Autorest generate_Id to signal regeneration is needed

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Summary

What's included

Validation — live test evidence

Deeper verification — proof the token acquisition pipeline actually fired

Additional live test — generated (non-custom-fronted) cmdlet

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Pull request overview

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YangAn-microsoft commented Aug 12, 2026 •

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