Method Prepare

expr/http_endpoint.go:201–368

Prepare computes the request path and query string parameters as well as the headers and body taking into account the inherited values from the service.

()

// Prepare computes the request path and query string parameters as well as the
// headers and body taking into account the inherited values from the service.
func (e *HTTPEndpointExpr) Prepare() {
	// Avoid infinite recursions when traversing parents.
	if e.prepared {
		return
	}
	e.prepared = true
	if e.Headers == nil {
		e.Headers = NewEmptyMappedAttributeExpr()
	}
	if e.Cookies == nil {
		e.Cookies = NewEmptyMappedAttributeExpr()
	}
	if e.Params == nil {
		e.Params = NewEmptyMappedAttributeExpr()
	}

	// Inherit headers, cookies and params from parent service and API
	headers := NewEmptyMappedAttributeExpr()
	headers.Merge(Root.API.HTTP.Headers)
	headers.Merge(e.Service.Headers)

	cookies := NewEmptyMappedAttributeExpr()
	cookies.Merge(Root.API.HTTP.Cookies)
	cookies.Merge(e.Service.Cookies)

	params := NewEmptyMappedAttributeExpr()
	params.Merge(Root.API.HTTP.Params)
	params.Merge(e.Service.Params)

	if p := e.Service.Parent(); p != nil {
		if c := p.CanonicalEndpoint(); c != nil {
			c.Prepare()
			if !e.HasAbsoluteRoutes() {
				headers.Merge(c.Headers)
				cookies.Merge(c.Cookies)
				cpp := c.PathParams()
				params.Merge(cpp)

				// Inherit attributes for path params from parent service
				WalkMappedAttr(cpp, func(name, _ string, _ *AttributeExpr) error { // nolint: errcheck
					if att := c.MethodExpr.Payload.Find(name); att != nil {
						if e.MethodExpr.Payload.Type == Empty {
							e.MethodExpr.Payload.Type = &Object{}
						}
						if o := AsObject(e.MethodExpr.Payload.Type); o != nil && o.Attribute(name) == nil {
							if c.MethodExpr.Payload.IsRequired(name) {
								if e.MethodExpr.Payload.Validation == nil {
									e.MethodExpr.Payload.Validation = &ValidationExpr{}
								}
								e.MethodExpr.Payload.Validation.AddRequired(name)
							}
							o.Set(name, att)
						}
					}
					return nil
				})
			}
		}