[Swagger Linter Migration] RepeatedPathInfo -> no-repeated-path-info

.chronus/changes/arm-no-repeated-path-info.md

@@ -0,0 +1,9 @@
+---
+changeKind: feature
+packages:
+  - "@azure-tools/typespec-azure-resource-manager"
+---
+
+Add the `no-repeated-path-info` lint rule to warn when ARM PUT resource properties repeat path or query parameter names.
+
+This complements `arm-resource-duplicate-property`, which checks duplication of resource envelope property names rather than URI parameter names.

.chronus/changes/register-no-repeated-path-info-disabled.md

@@ -0,0 +1,7 @@
+---
+changeKind: internal
+packages:
+  - "@azure-tools/typespec-azure-rulesets"
+---
+
+Register the ARM `no-repeated-path-info` lint rule as disabled in the resource manager ruleset.

.chronus/changes/review-repeated-path-helpers.md

@@ -0,0 +1,7 @@
+---
+changeKind: internal
+packages:
+  - "@azure-tools/typespec-azure-resource-manager"
+---
+
+Reuse the ARM template-operation guard and compiler property lookup in the repeated-path rule.

packages/typespec-azure-resource-manager/README.md

@@ -69,6 +69,7 @@ Available ruleSets:
 | [`@azure-tools/typespec-azure-resource-manager/missing-x-ms-identifiers`](https://azure.github.io/typespec-azure/docs/libraries/azure-resource-manager/rules/missing-x-ms-identifiers)                                   | Array properties should describe their identifying properties with x-ms-identifiers. Decorate the property with @OpenAPI.extension("x-ms-identifiers", #[id-prop]) where "id-prop" is a list of the names of identifying properties in the item type. |
 | [`@azure-tools/typespec-azure-resource-manager/no-response-body`](https://azure.github.io/typespec-azure/docs/libraries/azure-resource-manager/rules/no-response-body)                                                   | Check that the body is empty for 202 and 204 responses, and not empty for other success (2xx) responses.                                                                                                                                              |
 | [`@azure-tools/typespec-azure-resource-manager/no-query-in-post`](https://azure.github.io/typespec-azure/docs/libraries/azure-resource-manager/rules/no-query-in-post)                                                   | ARM POST operations must not declare query parameters other than api-version.                                                                                                                                                                         |
+| [`@azure-tools/typespec-azure-resource-manager/no-repeated-path-info`](https://azure.github.io/typespec-azure/docs/libraries/azure-resource-manager/rules/no-repeated-path-info)                                         | ARM PUT request bodies must not repeat path or query parameters in the resource properties bag.                                                                                                                                                       |
 | [`@azure-tools/typespec-azure-resource-manager/missing-operations-endpoint`](https://azure.github.io/typespec-azure/docs/libraries/azure-resource-manager/rules/missing-operations-endpoint)                             | Check for missing Operations interface.                                                                                                                                                                                                               |
 | [`@azure-tools/typespec-azure-resource-manager/patch-envelope`](https://azure.github.io/typespec-azure/docs/libraries/azure-resource-manager/rules/patch-envelope)                                                       | Patch envelope properties should match the resource properties.                                                                                                                                                                                       |
 | [`@azure-tools/typespec-azure-resource-manager/arm-resource-patch`](https://azure.github.io/typespec-azure/docs/libraries/azure-resource-manager/rules/arm-resource-patch)                                               | Validate ARM PATCH operations.                                                                                                                                                                                                                        |

packages/typespec-azure-resource-manager/src/linter.ts

@@ -35,6 +35,7 @@ import { noOverridePropsRule } from "./rules/no-override-props.js";
 import { noQueryInCollectionRule } from "./rules/no-query-in-collection.js";
 import { noQueryInPointOpRule } from "./rules/no-query-in-point-op.js";
 import { noQueryInPostRule } from "./rules/no-query-in-post.js";
+import { noRepeatedPathInfoRule } from "./rules/no-repeated-path-info.js";
 import { noReservedResourcePropertyRule } from "./rules/no-reserved-resource-property.js";
 import { deleteOperationMissingRule } from "./rules/no-resource-delete-operation.js";
 import { noResponseBodyRule } from "./rules/no-response-body.js";
@@ -95,6 +96,7 @@ const rules = [
   missingXmsIdentifiersRule,
   noResponseBodyRule,
   noQueryInPostRule,
+  noRepeatedPathInfoRule,
   operationsInterfaceMissingRule,
   patchEnvelopePropertiesRules,
   patchOperationsRule,

packages/typespec-azure-resource-manager/src/rules/arm-resource-duplicate-property.md

@@ -1,5 +1,13 @@
 Envelope properties should not be duplicated in the `properties` model.
 
+This rule compares properties-bag members with envelope property names on ARM
+resource models, even without a PUT operation. It complements
+[`no-repeated-path-info`](./no-repeated-path-info.md), which compares them with
+HTTP path and query parameter names on PUT operations. For example, an envelope
+`name` with `@key("widgetName")` makes `properties.widgetName` a URI duplication
+only, while `properties.identity` duplicates an envelope `identity` even when
+there is no URI parameter named `identity`. Neither rule replaces the other.
+
 ## Impact
 
 - **Area:** API, SDK

packages/typespec-azure-resource-manager/src/rules/no-repeated-path-info.md

@@ -0,0 +1,112 @@
+ARM PUT request bodies should not repeat information already supplied in path or
+query parameters. Keep resource identity in the request URI and resource-specific
+data in the resource's `properties` bag, so callers do not have to supply
+potentially conflicting values twice.
+
+This rule compares authored member names in the model-valued `properties` bag
+with the PUT operation's HTTP path and query parameter names. It includes
+inherited members and reports on the repeated property declaration. Each matching
+name is reported once per concrete PUT operation; a declaration shared by two PUT
+operations can receive two diagnostics.
+
+This rule complements
+[`arm-resource-duplicate-property`](./arm-resource-duplicate-property.md), which
+compares properties-bag members with envelope property names on ARM resource
+models, independently of operations. For example, an envelope `name` with
+`@key("widgetName")` makes `properties.widgetName` a URI duplication only.
+Conversely, `properties.identity` duplicates an envelope `identity` only under
+the envelope rule when no URI parameter is named `identity`. Both rules can
+report a member when its name matches both an envelope property and a URI parameter.
+
+The check does not recurse into nested models, inspect top-level envelope
+duplicates, or check PATCH bodies. Template sources are skipped, but concrete
+operation aliases are checked. Provider namespace metadata is not required when
+this rule is selected. The rule is available but disabled by default in the
+Azure resource-manager ruleset.
+
+`@encodedName("application/json", ...)` does not change an authored property
+name for this check. A JSON alias alone cannot introduce or remove a diagnostic;
+HTTP `@path` and `@query` name overrides do determine the parameter names.
+
+## Impact
+
+- **Area:** API, SDK
+
+Repeating URI information in resource properties creates redundant SDK inputs
+and ambiguity when the request URI and payload disagree.
+
+## ❌ Incorrect
+
+The standard ARM create-or-replace operation carries `widgetName` in the URI.
+Repeating it in `WidgetProperties` triggers this rule.
+
+```tsp
+@armProviderNamespace
+namespace Microsoft.Contoso;
+
+model Widget is TrackedResource<WidgetProperties> {
+  @key("widgetName")
+  @segment("widgets")
+  @path
+  name: string;
+}
+
+model WidgetProperties {
+  widgetName?: string;
+  description?: string;
+}
+
+@armResourceOperations
+interface Widgets {
+  createOrUpdate is ArmResourceCreateOrReplaceSync<Widget>;
+}
+```
+
+## ✅ Correct
+
+Keep the same operation template and remove only the redundant properties-bag
+member.
+
+```tsp
+@armProviderNamespace
+namespace Microsoft.Contoso;
+
+model Widget is TrackedResource<WidgetProperties> {
+  @key("widgetName")
+  @segment("widgets")
+  @path
+  name: string;
+}
+
+model WidgetProperties {
+  description?: string;
+}
+
+@armResourceOperations
+interface Widgets {
+  createOrUpdate is ArmResourceCreateOrReplaceSync<Widget>;
+}
+```
+
+## Suppression
+
+Prefer removing the redundant properties-bag member. If a published API must
+retain the duplication for compatibility and an ARM reviewer has approved the
+exception, suppress the warning on that member with a specific justification:
+
+```tsp
+model WidgetProperties {
+  #suppress "@azure-tools/typespec-azure-resource-manager/no-repeated-path-info" "Retained for compatibility with the approved published API."
+  widgetName?: string;
+}
+```
+
+## LintDiff Equivalent
+
+This rule corresponds to
+[RepeatedPathInfo](https://github.com/Azure/azure-openapi-validator/blob/main/docs/repeated-path-info.md)
+and ARM guideline `RPC-Put-V1-05`. Unlike the Swagger validator, which compares
+serialized JSON keys, this rule deliberately compares authored TypeSpec member
+names. JSON name overrides therefore have only partial Swagger parity.
+The rule checks the compiler's native operation graph, not an emitted
+single-version schema.

packages/typespec-azure-resource-manager/src/rules/no-repeated-path-info.ts

@@ -0,0 +1,79 @@
+import type { Model } from "@typespec/compiler";
+import {
+  createRule,
+  fileRef,
+  getProperty,
+  isTemplateInstance,
+  paramMessage,
+  walkPropertiesInherited,
+} from "@typespec/compiler";
+import { getHttpOperation } from "@typespec/http";
+import { isTemplatedInterfaceOperation } from "./utils.js";
+
+export const noRepeatedPathInfoRule = createRule({
+  name: "no-repeated-path-info",
+  docs: fileRef.fromPackageRoot("src/rules/no-repeated-path-info.md"),
+  description:
+    "ARM PUT request bodies must not repeat path or query parameters in the resource properties bag.",
+  severity: "warning",
+  url: "https://azure.github.io/typespec-azure/docs/libraries/azure-resource-manager/rules/no-repeated-path-info",
+  messages: {
+    default: paramMessage`Request body property '${"name"}' repeats information already carried in the path or query.`,
+  },
+  create(context) {
+    return {
+      operation: (operation) => {
+        if (isTemplateInstance(operation) || isTemplatedInterfaceOperation(operation)) {
+          return;
+        }
+
+        const [httpOperation] = getHttpOperation(context.program, operation);
+        if (httpOperation.verb !== "put") {
+          return;
+        }
+
+        const repeatedNames = new Set(
+          httpOperation.parameters.parameters
+            .filter((parameter) => parameter.type === "path" || parameter.type === "query")
+            .map((parameter) => parameter.name),
+        );
+        if (repeatedNames.size === 0) {
+          return;
+        }
+
+        const body = httpOperation.parameters.body;
+        if (body === undefined || body.bodyKind !== "single" || body.type.kind !== "Model") {
+          return;
+        }
+
+        const propertiesModel = getPropertiesModel(body.type);
+        if (propertiesModel === undefined) {
+          return;
+        }
+
+        const reportedNames = new Set<string>();
+        for (const property of walkPropertiesInherited(propertiesModel)) {
+          if (!repeatedNames.has(property.name)) {
+            continue;
+          }
+          if (reportedNames.has(property.name)) {
+            continue;
+          }
+          reportedNames.add(property.name);
+
+          context.reportDiagnostic({
+            target: property,
+            format: {
+              name: property.name,
+            },
+          });
+        }
+      },
+    };
+  },
+});
+
+function getPropertiesModel(model: Model): Model | undefined {
+  const property = getProperty(model, "properties");
+  return property?.type.kind === "Model" ? property.type : undefined;
+}