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Support custom ImdsId for AppServiceManagedIdentityCredential. #2284

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Support custom ImdsId for AppServiceManagedIdentityCredential. #2284

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93d9fc8
Allow specifying custom ImdsIds for AppServiceCredential.
tot0 Mar 5, 2025
c646422
Expose TokenCache for external use as it's nice to have when implemen…
tot0 Mar 5, 2025
30d9258
Revert "Expose TokenCache for external use as it's nice to have when …
tot0 Mar 5, 2025
b354206
Address PR comments.
tot0 Mar 5, 2025
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1 change: 0 additions & 1 deletion Cargo.lock
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10 changes: 10 additions & 0 deletions sdk/identity/azure_identity/CHANGELOG.md
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Original file line number Diff line number Diff line change
@@ -1,5 +1,15 @@
# Release History

## 0.23.0 (Unreleased)

### Features Added

- Added `ImdsId` param to `AppServiceManagedIdentityCredential::new`

### Breaking Changes

- Added `ImdsId` param to `AppServiceManagedIdentityCredential::new`

## 0.22.0 (2025-02-18)

### Features Added
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2 changes: 1 addition & 1 deletion sdk/identity/azure_identity/examples/specific_credential.rs
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Expand Up @@ -112,7 +112,7 @@ impl SpecificAzureCredential {
// case insensitive and allow spaces
match credential_type.replace(' ', "").to_lowercase().as_str() {
azure_credential_kinds::APP_SERVICE => {
AppServiceManagedIdentityCredential::new(options)
AppServiceManagedIdentityCredential::new(ImdsId::SystemAssigned, options)
.map(SpecificAzureCredentialKind::AppService)
.with_context(ErrorKind::Credential, || {
format!(
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7 changes: 5 additions & 2 deletions sdk/identity/azure_identity/src/credentials/app_service_managed_identity_credential.rs
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Expand Up @@ -19,7 +19,10 @@ pub struct AppServiceManagedIdentityCredential {
}

impl AppServiceManagedIdentityCredential {
pub fn new(options: impl Into<TokenCredentialOptions>) -> azure_core::Result<Arc<Self>> {
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@chlowell @scottaddie should this type even be exposed publicly? I'm close to refactoring azure_identity and I remember talking about how only ManagedIdentityCredential should be exposed and all the "implementation-specific" credentials should be internal. That would significantly affect the need for this PR and force consideration for how else to pass the IMDS ID. Comparing with Go's azidentity, I see it's just an implementation detail. I'm guessing this equates to ManagedIdentityCredentialOptions.ManagedIDKind? I'm not sure, though, since the only implementations I see are all user-assigned variants.

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A unified ManagedIdentityCredential credential makes sense to me. When to call the IMDS static IP endpiont and when to call a environment specific endpoint I guess switches on the presence of IDENTITY_ENDPOINT in env?

For any Managed Identity credential it is important to be somehow able to specify whether to use a specific ClientId or just use the endpoints default.

pub fn new(
id: ImdsId,
options: impl Into<TokenCredentialOptions>,
) -> azure_core::Result<Arc<Self>> {
let options = options.into();
let env = options.env();
let endpoint = &env
Expand All @@ -43,7 +46,7 @@ impl AppServiceManagedIdentityCredential {
API_VERSION,
SECRET_HEADER,
SECRET_ENV,
ImdsId::SystemAssigned,
id,
),
}))
}
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