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registry.go
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registry.go
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/*
Copyright 2021 The Dapr Authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package http
import (
"strings"
"github.com/pkg/errors"
middleware "github.com/dapr/components-contrib/middleware"
"github.com/dapr/dapr/pkg/components"
http_middleware "github.com/dapr/dapr/pkg/middleware/http"
)
type (
// Middleware is a HTTP middleware component definition.
Middleware struct {
Names []string
FactoryMethod FactoryMethod
}
// Registry is the interface for callers to get registered HTTP middleware.
Registry interface {
Register(components ...Middleware)
Create(name, version string, metadata middleware.Metadata) (http_middleware.Middleware, error)
}
httpMiddlewareRegistry struct {
middleware map[string]FactoryMethod
}
// FactoryMethod is the method creating middleware from metadata.
FactoryMethod func(metadata middleware.Metadata) (http_middleware.Middleware, error)
)
// New creates a Middleware.
func New(name string, factoryMethod FactoryMethod, aliases ...string) Middleware {
names := []string{name}
if len(aliases) > 0 {
names = append(names, aliases...)
}
return Middleware{
Names: names,
FactoryMethod: factoryMethod,
}
}
// NewRegistry returns a new HTTP middleware registry.
func NewRegistry() Registry {
return &httpMiddlewareRegistry{
middleware: map[string]FactoryMethod{},
}
}
// Register registers one or more new HTTP middlewares.
func (p *httpMiddlewareRegistry) Register(components ...Middleware) {
for _, component := range components {
for _, name := range component.Names {
p.middleware[createFullName(name)] = component.FactoryMethod
}
}
}
// Create instantiates a HTTP middleware based on `name`.
func (p *httpMiddlewareRegistry) Create(name, version string, metadata middleware.Metadata) (http_middleware.Middleware, error) {
if method, ok := p.getMiddleware(name, version); ok {
mid, err := method(metadata)
if err != nil {
return nil, errors.Errorf("error creating HTTP middleware %s/%s: %s", name, version, err)
}
return mid, nil
}
return nil, errors.Errorf("HTTP middleware %s/%s has not been registered", name, version)
}
func (p *httpMiddlewareRegistry) getMiddleware(name, version string) (FactoryMethod, bool) {
nameLower := strings.ToLower(name)
versionLower := strings.ToLower(version)
middlewareFn, ok := p.middleware[nameLower+"/"+versionLower]
if ok {
return middlewareFn, true
}
if components.IsInitialVersion(versionLower) {
middlewareFn, ok = p.middleware[nameLower]
}
return middlewareFn, ok
}
func createFullName(name string) string {
return strings.ToLower("middleware.http." + name)
}