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basic.go
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basic.go
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// Copyright 2021 dairongpeng <dairongpeng@foxmail.com>. All rights reserved.
//
// 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 auth
import (
"encoding/base64"
"strings"
"github.com/dairongpeng/leona/pkg/core"
"github.com/dairongpeng/leona/pkg/errors"
"github.com/gin-gonic/gin"
"github.com/dairongpeng/leona/internal/pkg/code"
"github.com/dairongpeng/leona/internal/pkg/middleware"
)
// BasicStrategy defines Basic authentication strategy.
type BasicStrategy struct {
compare func(username string, password string) bool
}
var _ middleware.AuthStrategy = &BasicStrategy{}
// NewBasicStrategy create basic strategy with compare function.
func NewBasicStrategy(compare func(username string, password string) bool) BasicStrategy {
return BasicStrategy{
compare: compare,
}
}
// AuthFunc defines basic strategy as the gin authentication middleware.
func (b BasicStrategy) AuthFunc() gin.HandlerFunc {
return func(c *gin.Context) {
auth := strings.SplitN(c.Request.Header.Get("Authorization"), " ", 2)
if len(auth) != 2 || auth[0] != "Basic" {
core.WriteResponse(
c,
errors.WithCode(code.ErrSignatureInvalid, "Authorization header format is wrong."),
nil,
)
c.Abort()
return
}
payload, _ := base64.StdEncoding.DecodeString(auth[1])
pair := strings.SplitN(string(payload), ":", 2)
if len(pair) != 2 || !b.compare(pair[0], pair[1]) {
core.WriteResponse(
c,
errors.WithCode(code.ErrSignatureInvalid, "Authorization header format is wrong."),
nil,
)
c.Abort()
return
}
c.Set(middleware.UsernameKey, pair[0])
c.Next()
}
}