protoc-gen-openapiv2: support overriding path parameter names

docs/docs/mapping/customizing_openapi_output.md

@@ -403,6 +403,52 @@ For a more in depth example see [visibility_rule_echo_service.proto](https://git
 - [`visibility_restriction_selectors=INTERNAL,visibility_restriction_selectors=PREVIEW`](https://github.com/grpc-ecosystem/grpc-gateway/blob/master/examples/internal/proto/examplepb/visibility_rule_preview_and_internal_echo_service.swagger.json)
 - [Not set](https://github.com/grpc-ecosystem/grpc-gateway/blob/master/examples/internal/proto/examplepb/visibility_rule_none_echo_service.swagger.json)
 
+### Path parameters
+
+When defining HTTP bindings with path parameters that contain multiple path segments, as suggested by the [Google AIPs](https://google.aip.dev/), the path parameter names are numbered to avoid generating duplicate paths in the OpenAPI file.
+
+For example, consider:
+```protobuf
+service LibraryService {
+  rpc GetShelf(GetShelfRequest) returns (Shelf) {
+    option (google.api.http) = {
+      get: "/v1/{name=shelves/*}"
+    };
+  }
+  rpc GetBook(GetBookRequest) returns (Book) {
+    option (google.api.http) = {
+      get: "/v1/{name=shelves/*/books/*}"
+    };
+  }
+}
+
+message GetShelfRequest {
+  string name = 1;
+}
+
+message GetBookRequest {
+  string name = 1;
+}
+```
+
+This will generate the following paths:
+- `/v1/{name}`
+- `/v1/{name_1}`
+
+To override the path parameter names, annotate the field used as path parameter:
+```protobuf
+message GetShelfRequest {
+  string name = 1 [(grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {field_configuration: {path_param_name: "shelfName"}}];
+}
+message GetBookRequest {
+  string name = 1 [(grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {field_configuration: {path_param_name: "bookName"}}];
+}
+```
+
+This will instead generate the following paths:
+- `/v1/{shelfName}`
+- `/v1/{bookName}`
+
 ### Output format
 
 By default the output format is JSON, but it is possible to configure it using the `output_format` option. Allowed values are: `json`, `yaml`. The output format will also change the extension of the output files.

examples/internal/clients/abe/api/swagger.yaml

@@ -1059,17 +1059,17 @@ paths:
           description: "An unexpected error response."
           schema:
             $ref: "#/definitions/rpcStatus"
-  /v1/example/a_bit_of_everything/query/{uuid}:
+  /v1/example/a_bit_of_everything/query/{uuidName}:
     get:
       tags:
       - "ABitOfEverythingService"
       operationId: "ABitOfEverythingService_GetQuery"
       parameters:
-      - name: "uuid"
+      - name: "uuidName"
         in: "path"
         required: true
         type: "string"
-        x-exportParamName: "Uuid"
+        x-exportParamName: "UuidName"
       - name: "singleNested.name"
         in: "query"
         description: "name is nested field."
@@ -1692,22 +1692,27 @@ paths:
           description: "An unexpected error response."
           schema:
             $ref: "#/definitions/rpcStatus"
-  /v1/example/a_bit_of_everything/{uuid}:
-    get:
+  /v1/example/a_bit_of_everything/{uuidName}:
+    put:
       tags:
       - "ABitOfEverythingService"
-      operationId: "ABitOfEverythingService_Lookup"
+      operationId: "ABitOfEverythingService_Update"
       parameters:
-      - name: "uuid"
+      - name: "uuidName"
         in: "path"
         required: true
         type: "string"
-        x-exportParamName: "Uuid"
+        x-exportParamName: "UuidName"
+      - in: "body"
+        name: "body"
+        required: true
+        schema:
+          $ref: "#/definitions/A bit of everything"
+        x-exportParamName: "Body"
       responses:
         200:
           description: "A successful response."
-          schema:
-            $ref: "#/definitions/examplepbABitOfEverything"
+          schema: {}
         403:
           description: "Returned when the user does not have permission to access\
             \ the resource."
@@ -1729,26 +1734,22 @@ paths:
           description: "An unexpected error response."
           schema:
             $ref: "#/definitions/rpcStatus"
-    put:
+  /v1/example/a_bit_of_everything/{uuid}:
+    get:
       tags:
       - "ABitOfEverythingService"
-      operationId: "ABitOfEverythingService_Update"
+      operationId: "ABitOfEverythingService_Lookup"
       parameters:
       - name: "uuid"
         in: "path"
         required: true
         type: "string"
         x-exportParamName: "Uuid"
-      - in: "body"
-        name: "body"
-        required: true
-        schema:
-          $ref: "#/definitions/A bit of everything"
-        x-exportParamName: "Body"
       responses:
         200:
           description: "A successful response."
-          schema: {}
+          schema:
+            $ref: "#/definitions/examplepbABitOfEverything"
         403:
           description: "Returned when the user does not have permission to access\
             \ the resource."
@@ -2200,17 +2201,17 @@ paths:
           description: "An unexpected error response."
           schema:
             $ref: "#/definitions/rpcStatus"
-  /v2/example/a_bit_of_everything/{abe.uuid}:
+  /v2/example/a_bit_of_everything/{uuidName}:
     put:
       tags:
       - "ABitOfEverythingService"
       operationId: "ABitOfEverythingService_UpdateV2"
       parameters:
-      - name: "abe.uuid"
+      - name: "uuidName"
         in: "path"
         required: true
         type: "string"
-        x-exportParamName: "AbeUuid"
+        x-exportParamName: "UuidName"
       - in: "body"
         name: "abe"
         description: "A bit of everything\n\nIntentionally complicated message type\
@@ -2256,11 +2257,11 @@ paths:
       - "ABitOfEverythingService"
       operationId: "ABitOfEverythingService_UpdateV22"
       parameters:
-      - name: "abe.uuid"
+      - name: "uuidName"
         in: "path"
         required: true
         type: "string"
-        x-exportParamName: "AbeUuid"
+        x-exportParamName: "UuidName"
       - in: "body"
         name: "abe"
         description: "A bit of everything\n\nIntentionally complicated message type\
@@ -2650,17 +2651,17 @@ paths:
           description: "An unexpected error response."
           schema:
             $ref: "#/definitions/rpcStatus"
-  /v2a/example/a_bit_of_everything/{abe.uuid}:
+  /v2a/example/a_bit_of_everything/{uuidName}:
     patch:
       tags:
       - "ABitOfEverythingService"
       operationId: "ABitOfEverythingService_UpdateV23"
       parameters:
-      - name: "abe.uuid"
+      - name: "uuidName"
         in: "path"
         required: true
         type: "string"
-        x-exportParamName: "AbeUuid"
+        x-exportParamName: "UuidName"
       - in: "body"
         name: "body"
         required: true

examples/internal/clients/abe/api_a_bit_of_everything_service.go

@@ -2718,7 +2718,7 @@ func (a *ABitOfEverythingServiceApiService) ABitOfEverythingServiceGetMessageWit
 /* 
 ABitOfEverythingServiceApiService
  * @param ctx context.Context - for authentication, logging, cancellation, deadlines, tracing, etc. Passed from http.Request or context.Background().
- * @param uuid
+ * @param uuidName
  * @param floatValue Float value field
  * @param requiredStringViaFieldBehaviorAnnotation mark a field as required in Open API definition
  * @param optional nil or *ABitOfEverythingServiceGetQueryOpts - Optional Parameters:
@@ -2797,7 +2797,7 @@ type ABitOfEverythingServiceGetQueryOpts struct {
 	OptionalStringValue optional.String
 }
 
-func (a *ABitOfEverythingServiceApiService) ABitOfEverythingServiceGetQuery(ctx context.Context, uuid string, floatValue float32, requiredStringViaFieldBehaviorAnnotation string, localVarOptionals *ABitOfEverythingServiceGetQueryOpts) (interface{}, *http.Response, error) {
+func (a *ABitOfEverythingServiceApiService) ABitOfEverythingServiceGetQuery(ctx context.Context, uuidName string, floatValue float32, requiredStringViaFieldBehaviorAnnotation string, localVarOptionals *ABitOfEverythingServiceGetQueryOpts) (interface{}, *http.Response, error) {
 	var (
 		localVarHttpMethod = strings.ToUpper("Get")
 		localVarPostBody   interface{}
@@ -2807,8 +2807,8 @@ func (a *ABitOfEverythingServiceApiService) ABitOfEverythingServiceGetQuery(ctx
 	)
 
 	// create path and map variables
-	localVarPath := a.client.cfg.BasePath + "/v1/example/a_bit_of_everything/query/{uuid}"
-	localVarPath = strings.Replace(localVarPath, "{"+"uuid"+"}", fmt.Sprintf("%v", uuid), -1)
+	localVarPath := a.client.cfg.BasePath + "/v1/example/a_bit_of_everything/query/{uuidName}"
+	localVarPath = strings.Replace(localVarPath, "{"+"uuidName"+"}", fmt.Sprintf("%v", uuidName), -1)
 
 	localVarHeaderParams := make(map[string]string)
 	localVarQueryParams := url.Values{}
@@ -3897,12 +3897,12 @@ func (a *ABitOfEverythingServiceApiService) ABitOfEverythingServiceTimeout(ctx c
 /* 
 ABitOfEverythingServiceApiService
  * @param ctx context.Context - for authentication, logging, cancellation, deadlines, tracing, etc. Passed from http.Request or context.Background().
- * @param uuid
+ * @param uuidName
  * @param body
 
 @return interface{}
 */
-func (a *ABitOfEverythingServiceApiService) ABitOfEverythingServiceUpdate(ctx context.Context, uuid string, body ABitOfEverything) (interface{}, *http.Response, error) {
+func (a *ABitOfEverythingServiceApiService) ABitOfEverythingServiceUpdate(ctx context.Context, uuidName string, body ABitOfEverything) (interface{}, *http.Response, error) {
 	var (
 		localVarHttpMethod = strings.ToUpper("Put")
 		localVarPostBody   interface{}
@@ -3912,8 +3912,8 @@ func (a *ABitOfEverythingServiceApiService) ABitOfEverythingServiceUpdate(ctx co
 	)
 
 	// create path and map variables
-	localVarPath := a.client.cfg.BasePath + "/v1/example/a_bit_of_everything/{uuid}"
-	localVarPath = strings.Replace(localVarPath, "{"+"uuid"+"}", fmt.Sprintf("%v", uuid), -1)
+	localVarPath := a.client.cfg.BasePath + "/v1/example/a_bit_of_everything/{uuidName}"
+	localVarPath = strings.Replace(localVarPath, "{"+"uuidName"+"}", fmt.Sprintf("%v", uuidName), -1)
 
 	localVarHeaderParams := make(map[string]string)
 	localVarQueryParams := url.Values{}
@@ -4230,7 +4230,7 @@ func (a *ABitOfEverythingServiceApiService) ABitOfEverythingServiceUpdateBook(ct
 /* 
 ABitOfEverythingServiceApiService
  * @param ctx context.Context - for authentication, logging, cancellation, deadlines, tracing, etc. Passed from http.Request or context.Background().
- * @param abeUuid
+ * @param uuidName
  * @param abe A bit of everything  Intentionally complicated message type to cover many features of Protobuf.
  * @param optional nil or *ABitOfEverythingServiceUpdateV2Opts - Optional Parameters:
      * @param "UpdateMask" (optional.String) -  The paths to update.
@@ -4242,7 +4242,7 @@ type ABitOfEverythingServiceUpdateV2Opts struct {
 	UpdateMask optional.String
 }
 
-func (a *ABitOfEverythingServiceApiService) ABitOfEverythingServiceUpdateV2(ctx context.Context, abeUuid string, abe ABitOfEverything2, localVarOptionals *ABitOfEverythingServiceUpdateV2Opts) (interface{}, *http.Response, error) {
+func (a *ABitOfEverythingServiceApiService) ABitOfEverythingServiceUpdateV2(ctx context.Context, uuidName string, abe ABitOfEverything2, localVarOptionals *ABitOfEverythingServiceUpdateV2Opts) (interface{}, *http.Response, error) {
 	var (
 		localVarHttpMethod = strings.ToUpper("Put")
 		localVarPostBody   interface{}
@@ -4252,8 +4252,8 @@ func (a *ABitOfEverythingServiceApiService) ABitOfEverythingServiceUpdateV2(ctx
 	)
 
 	// create path and map variables
-	localVarPath := a.client.cfg.BasePath + "/v2/example/a_bit_of_everything/{abe.uuid}"
-	localVarPath = strings.Replace(localVarPath, "{"+"abe.uuid"+"}", fmt.Sprintf("%v", abeUuid), -1)
+	localVarPath := a.client.cfg.BasePath + "/v2/example/a_bit_of_everything/{uuidName}"
+	localVarPath = strings.Replace(localVarPath, "{"+"uuidName"+"}", fmt.Sprintf("%v", uuidName), -1)
 
 	localVarHeaderParams := make(map[string]string)
 	localVarQueryParams := url.Values{}
@@ -4399,7 +4399,7 @@ func (a *ABitOfEverythingServiceApiService) ABitOfEverythingServiceUpdateV2(ctx
 /* 
 ABitOfEverythingServiceApiService
  * @param ctx context.Context - for authentication, logging, cancellation, deadlines, tracing, etc. Passed from http.Request or context.Background().
- * @param abeUuid
+ * @param uuidName
  * @param abe A bit of everything  Intentionally complicated message type to cover many features of Protobuf.
  * @param optional nil or *ABitOfEverythingServiceUpdateV22Opts - Optional Parameters:
      * @param "UpdateMask" (optional.String) -  The paths to update.
@@ -4411,7 +4411,7 @@ type ABitOfEverythingServiceUpdateV22Opts struct {
 	UpdateMask optional.String
 }
 
-func (a *ABitOfEverythingServiceApiService) ABitOfEverythingServiceUpdateV22(ctx context.Context, abeUuid string, abe ABitOfEverything3, localVarOptionals *ABitOfEverythingServiceUpdateV22Opts) (interface{}, *http.Response, error) {
+func (a *ABitOfEverythingServiceApiService) ABitOfEverythingServiceUpdateV22(ctx context.Context, uuidName string, abe ABitOfEverything3, localVarOptionals *ABitOfEverythingServiceUpdateV22Opts) (interface{}, *http.Response, error) {
 	var (
 		localVarHttpMethod = strings.ToUpper("Patch")
 		localVarPostBody   interface{}
@@ -4421,8 +4421,8 @@ func (a *ABitOfEverythingServiceApiService) ABitOfEverythingServiceUpdateV22(ctx
 	)
 
 	// create path and map variables
-	localVarPath := a.client.cfg.BasePath + "/v2/example/a_bit_of_everything/{abe.uuid}"
-	localVarPath = strings.Replace(localVarPath, "{"+"abe.uuid"+"}", fmt.Sprintf("%v", abeUuid), -1)
+	localVarPath := a.client.cfg.BasePath + "/v2/example/a_bit_of_everything/{uuidName}"
+	localVarPath = strings.Replace(localVarPath, "{"+"uuidName"+"}", fmt.Sprintf("%v", uuidName), -1)
 
 	localVarHeaderParams := make(map[string]string)
 	localVarQueryParams := url.Values{}
@@ -4568,12 +4568,12 @@ func (a *ABitOfEverythingServiceApiService) ABitOfEverythingServiceUpdateV22(ctx
 /* 
 ABitOfEverythingServiceApiService
  * @param ctx context.Context - for authentication, logging, cancellation, deadlines, tracing, etc. Passed from http.Request or context.Background().
- * @param abeUuid
+ * @param uuidName
  * @param body
 
 @return interface{}
 */
-func (a *ABitOfEverythingServiceApiService) ABitOfEverythingServiceUpdateV23(ctx context.Context, abeUuid string, body UpdateV2RequestRequestForUpdateIncludesTheMessageAndTheUpdateMask) (interface{}, *http.Response, error) {
+func (a *ABitOfEverythingServiceApiService) ABitOfEverythingServiceUpdateV23(ctx context.Context, uuidName string, body UpdateV2RequestRequestForUpdateIncludesTheMessageAndTheUpdateMask) (interface{}, *http.Response, error) {
 	var (
 		localVarHttpMethod = strings.ToUpper("Patch")
 		localVarPostBody   interface{}
@@ -4583,8 +4583,8 @@ func (a *ABitOfEverythingServiceApiService) ABitOfEverythingServiceUpdateV23(ctx
 	)
 
 	// create path and map variables
-	localVarPath := a.client.cfg.BasePath + "/v2a/example/a_bit_of_everything/{abe.uuid}"
-	localVarPath = strings.Replace(localVarPath, "{"+"abe.uuid"+"}", fmt.Sprintf("%v", abeUuid), -1)
+	localVarPath := a.client.cfg.BasePath + "/v2a/example/a_bit_of_everything/{uuidName}"
+	localVarPath = strings.Replace(localVarPath, "{"+"uuidName"+"}", fmt.Sprintf("%v", uuidName), -1)
 
 	localVarHeaderParams := make(map[string]string)
 	localVarQueryParams := url.Values{}