Method Validate

expr/http_response.go:134–264

Validate checks that the response definition is consistent: its status is set and the result type definition if any is valid.

(e *HTTPEndpointExpr)

// Validate checks that the response definition is consistent: its status is set
// and the result type definition if any is valid.
func (r *HTTPResponseExpr) Validate(e *HTTPEndpointExpr) *eval.ValidationErrors {
	verr := new(eval.ValidationErrors)

	if r.StatusCode == 0 {
		verr.Add(r, "HTTP response status not defined")
	} else if !bodyAllowedForStatus(r.StatusCode) && !e.MethodExpr.IsStreaming() {
		ep, ok := r.Parent.(*HTTPEndpointExpr)
		if ok && httpResponseBody(ep, r).Type != Empty {
			verr.Add(r, "Response body defined for status code %d which does not allow response body.", r.StatusCode)
		}
	}

	// text/html and text/plain can only encode strings so make sure there isn't
	// an explicit conflict with the content-type and response.
	if (r.ContentType == "text/html" || r.ContentType == "text/plain") && !e.SkipRequestBodyEncodeDecode {
		if e.MethodExpr.Result.Type != nil && e.MethodExpr.Result.Type != String && e.MethodExpr.Result.Type != Bytes && r.Body == nil {
			verr.Add(r, "Result type must be String or Bytes when ContentType is '%s'", r.ContentType)
		}
		if r.Body != nil && r.Body.Type != String && r.Body.Type != Bytes {
			verr.Add(r, "Result type must be String or Bytes when ContentType is '%s'", r.ContentType)
		}
	}

	rt, isrt := e.MethodExpr.Result.Type.(*ResultTypeExpr)
	resultAttributeType := func(name string) DataType {
		if !IsObject(e.MethodExpr.Result.Type) {
			return nil
		}
		if isrt {
			if view, ok := e.MethodExpr.Result.Meta.Last(ViewMetaKey); ok {
				v := rt.View(view)
				if v == nil {
					return nil
				}
				return v.AttributeExpr.Find(name).Type
			}
			for _, v := range rt.Views {
				if !rt.ViewHasAttribute(v.Name, name) {
					return nil
				}
			}
		}
		att := e.MethodExpr.Result.Find(name)
		if att == nil || att.Type == nil {
			// nil != nil
			return nil
		}
		return att.Type
	}

	var inview string
	if isrt {
		inview = " all views of"
	}

	if !r.Headers.IsEmpty() {
		verr.Merge(r.Headers.Validate("HTTP response headers", r))
		switch {