Golang errors.New函數代碼示例

// BindRequest both binds and validates a request, it assumes that complex things implement a Validatable(strfmt.Registry) error interface
// for simple values it will use straight method calls
func (o *UploadTaskFileParams) BindRequest(r *http.Request, route *middleware.MatchedRoute) error {
	var res []error
	o.HTTPRequest = r

	if err := r.ParseMultipartForm(32 << 20); err != nil {
		if err != http.ErrNotMultipart {
			return err
		} else if err := r.ParseForm(); err != nil {
			return err
		}
	}
	fds := runtime.Values(r.Form)

	fdDescription, fdhkDescription, _ := fds.GetOK("description")
	if err := o.bindDescription(fdDescription, fdhkDescription, route.Formats); err != nil {
		res = append(res, err)
	}

	file, fileHeader, err := r.FormFile("file")
	if err != nil {
		res = append(res, errors.New(400, "reading file %q failed: %v", "file", err))
	} else {
		o.File = runtime.File{Data: file, Header: fileHeader}
	}

	rID, rhkID, _ := route.Params.GetOK("id")
	if err := o.bindID(rID, rhkID, route.Formats); err != nil {
		res = append(res, err)
	}

	if len(res) > 0 {
		return errors.CompositeValidationError(res...)
	}
	return nil
}

// APIKeyAuth creates an authenticator that uses a token for authorization.
// This token can be obtained from either a header or a query string
func APIKeyAuth(name, in string, authenticate TokenAuthentication) runtime.Authenticator {
	inl := strings.ToLower(in)
	if inl != "query" && inl != "header" {
		// panic because this is most likely a typo
		panic(errors.New(500, "api key auth: in value needs to be either \"query\" or \"header\"."))
	}

	var getToken func(*http.Request) string
	switch inl {
	case "header":
		getToken = func(r *http.Request) string { return r.Header.Get(name) }
	case "query":
		getToken = func(r *http.Request) string { return r.URL.Query().Get(name) }
	}

	return httpAuthenticator(func(r *http.Request) (bool, interface{}, error) {
		token := getToken(r)
		if token == "" {
			return false, nil, nil
		}

		p, err := authenticate(token)
		return true, p, err
	})
}

// Bind perform the databinding and validation
func (o *untypedRequestBinder) Bind(request *http.Request, routeParams RouteParams, consumer runtime.Consumer, data interface{}) error {
	val := reflect.Indirect(reflect.ValueOf(data))
	isMap := val.Kind() == reflect.Map
	var result []error

	for fieldName, param := range o.Parameters {
		binder := o.paramBinders[fieldName]

		var target reflect.Value
		if !isMap {
			binder.Name = fieldName
			target = val.FieldByName(fieldName)
		}

		if isMap {
			tpe := binder.Type()
			if tpe == nil {
				if param.Schema.Type.Contains("array") {
					tpe = reflect.TypeOf([]interface{}{})
				} else {
					tpe = reflect.TypeOf(map[string]interface{}{})
				}
			}
			target = reflect.Indirect(reflect.New(tpe))

		}

		if !target.IsValid() {
			result = append(result, errors.New(500, "parameter name %q is an unknown field", binder.Name))
			continue
		}

		if err := binder.Bind(request, routeParams, consumer, target); err != nil {
			result = append(result, err)
			continue
		}

		if binder.validator != nil {
			rr := binder.validator.Validate(target.Interface())
			if rr != nil && rr.HasErrors() {
				result = append(result, rr.AsError())
			}
		}

		if isMap {
			val.SetMapIndex(reflect.ValueOf(param.Name), target)
		}
	}

	if len(result) > 0 {
		return errors.CompositeValidationError(result...)
	}

	return nil
}

func addItem(item *models.Item) error {
	if item == nil {
		return errors.New(500, "item must be present")
	}

	itemsLock.Lock()
	defer itemsLock.Unlock()

	newID := newItemID()
	item.ID = newID
	items[newID] = item

	return nil
}

// BindValidRequest binds a params object to a request but only when the request is valid
// if the request is not valid an error will be returned
func (c *Context) BindValidRequest(request *http.Request, route *MatchedRoute, binder RequestBinder) error {
	var res []error

	requestContentType := "*/*"
	// check and validate content type, select consumer
	if runtime.HasBody(request) {
		ct, _, err := runtime.ContentType(request.Header)
		if err != nil {
			res = append(res, err)
		} else {
			if err := validateContentType(route.Consumes, ct); err != nil {
				res = append(res, err)
			}
			if len(res) == 0 {
				cons, ok := route.Consumers[ct]
				if !ok {
					res = append(res, errors.New(500, "no consumer registered for %s", ct))
				} else {
					route.Consumer = cons
					requestContentType = ct
				}
			}
		}
	}

	// check and validate the response format
	if len(res) == 0 && runtime.HasBody(request) {
		if str := NegotiateContentType(request, route.Produces, requestContentType); str == "" {
			res = append(res, errors.InvalidResponseFormat(request.Header.Get(runtime.HeaderAccept), route.Produces))
		}
	}

	// now bind the request with the provided binder
	// it's assumed the binder will also validate the request and return an error if the
	// request is invalid
	if binder != nil && len(res) == 0 {
		if err := binder.BindRequest(request, route); err != nil {
			return err
		}
	}

	if len(res) > 0 {
		return errors.CompositeValidationError(res...)
	}
	return nil
}

func updateItem(id int64, item *models.Item) error {
	if item == nil {
		return errors.New(500, "item must be present")
	}

	itemsLock.Lock()
	defer itemsLock.Unlock()

	_, exists := items[id]
	if !exists {
		return errors.NotFound("not found: item %d", id)
	}

	item.ID = id
	items[id] = item
	return nil
}

func unmarshalPricingComponent(data []byte, consumer runtime.Consumer) (PricingComponent, error) {
	buf := bytes.NewBuffer(data)
	buf2 := bytes.NewBuffer(data)

	// the first time this is read is to fetch the value of the @type property.
	var getType struct {
		AtType string `json:"@type"`
	}
	if err := consumer.Consume(buf, &getType); err != nil {
		return nil, err
	}

	if err := validate.RequiredString("@type", "body", getType.AtType); err != nil {
		return nil, err
	}

	// The value of @type is used to determine which type to create and unmarshal the data into
	switch getType.AtType {
	case "flatPricingComponent":
		var result FlatPricingComponent
		if err := consumer.Consume(buf2, &result); err != nil {
			return nil, err
		}
		return &result, nil

	case "tieredPricingComponent":
		var result TieredPricingComponent
		if err := consumer.Consume(buf2, &result); err != nil {
			return nil, err
		}
		return &result, nil

	case "tieredVolumePricingComponent":
		var result TieredVolumePricingComponent
		if err := consumer.Consume(buf2, &result); err != nil {
			return nil, err
		}
		return &result, nil

	}
	return nil, errors.New(422, "invalid @type value: %q", getType.AtType)

}

func (s *SpecValidator) validateSchemaItems(schema spec.Schema, prefix, opID string) error {
	if !schema.Type.Contains("array") {
		return nil
	}

	if schema.Items == nil || schema.Items.Len() == 0 {
		return errors.New(422, "%s for %q is a collection without an element type", prefix, opID)
	}

	schemas := schema.Items.Schemas
	if schema.Items.Schema != nil {
		schemas = []spec.Schema{*schema.Items.Schema}
	}
	for _, sch := range schemas {
		if err := s.validateSchemaItems(sch, prefix, opID); err != nil {
			return err
		}
	}
	return nil
}

func (v *validation) contentType() {
	if len(v.result) == 0 && runtime.HasBody(v.request) {
		ct, _, err := v.context.ContentType(v.request)
		if err != nil {
			v.result = append(v.result, err)
		}
		if len(v.result) == 0 {
			if err := validateContentType(v.route.Consumes, ct); err != nil {
				v.result = append(v.result, err)
			}
		}
		if ct != "" && v.route.Consumer == nil {
			cons, ok := v.route.Consumers[ct]
			if !ok {
				v.result = append(v.result, errors.New(500, "no consumer registered for %s", ct))
			} else {
				v.route.Consumer = cons
			}
		}
	}
}

// Respond renders the response after doing some content negotiation
func (c *Context) Respond(rw http.ResponseWriter, r *http.Request, produces []string, route *MatchedRoute, data interface{}) {
	offers := []string{}
	for _, mt := range produces {
		if mt != c.api.DefaultProduces() {
			offers = append(offers, mt)
		}
	}
	// the default producer is last so more specific producers take precedence
	offers = append(offers, c.api.DefaultProduces())

	format := c.ResponseFormat(r, offers)
	rw.Header().Set(runtime.HeaderContentType, format)

	if resp, ok := data.(Responder); ok {
		producers := route.Producers
		prod, ok := producers[format]
		if !ok {
			prods := c.api.ProducersFor([]string{c.api.DefaultProduces()})
			pr, ok := prods[c.api.DefaultProduces()]
			if !ok {
				panic(errors.New(http.StatusInternalServerError, "can't find a producer for "+format))
			}
			prod = pr
		}
		resp.WriteResponse(rw, prod)
		return
	}

	if err, ok := data.(error); ok {
		if format == "" {
			rw.Header().Set(runtime.HeaderContentType, runtime.JSONMime)
		}
		if route == nil || route.Operation == nil {
			c.api.ServeErrorFor("")(rw, r, err)
			return
		}
		c.api.ServeErrorFor(route.Operation.ID)(rw, r, err)
		return
	}

	if route == nil || route.Operation == nil {
		rw.WriteHeader(200)
		if r.Method == "HEAD" {
			return
		}
		producers := c.api.ProducersFor(offers)
		prod, ok := producers[format]
		if !ok {
			panic(errors.New(http.StatusInternalServerError, "can't find a producer for "+format))
		}
		if err := prod.Produce(rw, data); err != nil {
			panic(err) // let the recovery middleware deal with this
		}
		return
	}

	if _, code, ok := route.Operation.SuccessResponse(); ok {
		rw.WriteHeader(code)
		if code == 204 || r.Method == "HEAD" {
			return
		}

		producers := route.Producers
		prod, ok := producers[format]
		if !ok {
			if !ok {
				prods := c.api.ProducersFor([]string{c.api.DefaultProduces()})
				pr, ok := prods[c.api.DefaultProduces()]
				if !ok {
					panic(errors.New(http.StatusInternalServerError, "can't find a producer for "+format))
				}
				prod = pr
			}
		}
		if err := prod.Produce(rw, data); err != nil {
			panic(err) // let the recovery middleware deal with this
		}
		return
	}

	c.api.ServeErrorFor(route.Operation.ID)(rw, r, errors.New(http.StatusInternalServerError, "can't produce response"))
}