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// Copyright 2015 go-swagger maintainers
//
// 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 security
import (
"net/http"
"strings"
"github.com/go-openapi/errors"
"github.com/go-openapi/runtime"
)
// httpAuthenticator is a function that authenticates a HTTP request
func httpAuthenticator(handler func(*http.Request) (bool, interface{}, error)) runtime.Authenticator {
return runtime.AuthenticatorFunc(func(params interface{}) (bool, interface{}, error) {
if request, ok := params.(*http.Request); ok {
return handler(request)
}
if scoped, ok := params.(*ScopedAuthRequest); ok {
return handler(scoped.Request)
}
return false, nil, nil
})
}
func scopedAuthenticator(handler func(*ScopedAuthRequest) (bool, interface{}, error)) runtime.Authenticator {
return runtime.AuthenticatorFunc(func(params interface{}) (bool, interface{}, error) {
if request, ok := params.(*ScopedAuthRequest); ok {
return handler(request)
}
return false, nil, nil
})
}
// UserPassAuthentication authentication function
type UserPassAuthentication func(string, string) (interface{}, error)
// TokenAuthentication authentication function
type TokenAuthentication func(string) (interface{}, error)
// ScopedTokenAuthentication authentication function
type ScopedTokenAuthentication func(string, []string) (interface{}, error)
// BasicAuth creates a basic auth authenticator with the provided authentication function
func BasicAuth(authenticate UserPassAuthentication) runtime.Authenticator {
return httpAuthenticator(func(r *http.Request) (bool, interface{}, error) {
if usr, pass, ok := r.BasicAuth(); ok {
p, err := authenticate(usr, pass)
return true, p, err
}
return false, nil, 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
})
}
// ScopedAuthRequest contains both a http request and the required scopes for a particular operation
type ScopedAuthRequest struct {
Request *http.Request
RequiredScopes []string
}
// BearerAuth for use with oauth2 flows
func BearerAuth(name string, authenticate ScopedTokenAuthentication) runtime.Authenticator {
const prefix = "Bearer "
return scopedAuthenticator(func(r *ScopedAuthRequest) (bool, interface{}, error) {
var token string
hdr := r.Request.Header.Get("Authorization")
if strings.HasPrefix(hdr, prefix) {
token = strings.TrimPrefix(hdr, prefix)
}
if token == "" {
qs := r.Request.URL.Query()
token = qs.Get("access_token")
}
ct, _, _ := runtime.ContentType(r.Request.Header)
if token == "" && (ct == "application/x-www-form-urlencoded" || ct == "multipart/form-data") {
token = r.Request.FormValue("access_token")
}
if token == "" {
return false, nil, nil
}
p, err := authenticate(token, r.RequiredScopes)
return true, p, err
})
}
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