chore: make use of studio sdk for reRun requestBody (#1295)

This PR marks the `input` `overlay` and `targets` properties as required
the `RunRequestBody` properties so the component can be reused in the
`reRun` handler

internal/studio/oas_studio.yaml

@@ -19,14 +19,14 @@ paths:
           $ref: "#/components/responses/HealthResponse"
   /run:
     get:
-      summary: Run
+      summary: Get Last RunResult
       description: Get the output of the last run.
       operationId: getRun
       responses:
         "200":
           $ref: "#/components/responses/RunResponse"
     post:
-      summary: Run
+      summary: Rerun generation
       description: Regenerate the currently selected targets.
       operationId: run
       requestBody:
@@ -40,7 +40,7 @@ paths:
           $ref: "#/components/responses/RunResponse"
   /overlays/compare:
     post:
-      summary: Generate an overlay from two yaml files
+      summary: Generate Overlay
       description: Generate an overlay from two yaml files
       operationId: generateOverlay
       requestBody:
@@ -137,7 +137,13 @@ components:
           type: object
           additionalProperties:
             $ref: "#/components/schemas/TargetSpecificInputs"
-          description: Map of target specific inputs keyed on target name
+          description: |
+            Map of target specific inputs keyed on target name
+            Only present if a target input is modified
+      required:
+        - overlay
+        - input
+        - targets
     RunResponseData:
       type: object
       description: Map of target run summaries

internal/studio/studioHandlers.go

@@ -216,12 +216,7 @@ func (h *StudioHandlers) updateSourceAndTarget(r *http.Request) error {
 		Config string `json:"config"`
 	}
 
-	// Destructure the request body which is a json object with a single key "overlay" which is a string
-	var reqBody struct {
-		Overlay string                                     `json:"overlay"`
-		Input   string                                     `json:"input"`
-		Targets map[string]components.TargetSpecificInputs `json:"targets"` // this is only present if a target input is modified
-	}
+	var reqBody components.RunRequestBody
 	err = json.NewDecoder(r.Body).Decode(&reqBody)
 	if err != nil {
 		return errors.ErrBadRequest.Wrap(fmt.Errorf("error decoding request body: %w", err))