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attachment.go
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attachment.go
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// Copyright 2016 HenryLee. 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.
// define common middlewares.
package middleware
import (
"regexp"
"strings"
"github.com/henrylee2cn/faygo"
)
// NewAttachment has the response content downloaded as an attachment file.
// Note: if the specifiedFileExtension is empty, applies to any response content.
func NewAttachment(specifiedFileExtension ...string) faygo.HandlerFunc {
re := regexp.MustCompile("^\\.[^\\.]+$")
hash := make(map[string]bool, len(specifiedFileExtension))
for _, s := range specifiedFileExtension {
if !re.MatchString(s) {
faygo.Fatalf("Invalid file extension: %s", s)
}
hash[strings.ToLower(s)] = true
}
return func(ctx *faygo.Context) error {
var isAttachment bool
if len(specifiedFileExtension) == 0 {
isAttachment = true
} else {
p := ctx.Path()
if idx := strings.LastIndex(p, "."); idx != -1 {
isAttachment = hash[strings.ToLower(p[idx:])]
}
}
if isAttachment {
ctx.SetHeader(faygo.HeaderContentDisposition, "attachment")
}
return nil
}
}