62 lines
1.6 KiB
Go
62 lines
1.6 KiB
Go
// Copyright © 2016 Abcum Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package api
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import (
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"mime"
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"sort"
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"github.com/labstack/echo"
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)
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// TypeOpts defines options for the Head middleward
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type TypeOpts struct {
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AllowedContent []string
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}
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// Type defines middleware for checking the request content-type
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func Type(opts *TypeOpts) echo.MiddlewareFunc {
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return func(h echo.HandlerFunc) echo.HandlerFunc {
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return func(c *echo.Context) error {
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// Set default values for opts.AllowedContent
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allowedContent := opts.AllowedContent
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if len(allowedContent) == 0 {
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allowedContent = []string{echo.ApplicationJSON}
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}
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// Extract the Content-Type header
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header := c.Request().Header.Get(echo.ContentType)
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cotype, _, _ := mime.ParseMediaType(header)
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// Sort and search opts.AllowedContent types
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sort.Strings(allowedContent)
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i := sort.SearchStrings(allowedContent, cotype)
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if c.Request().ContentLength == 0 {
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return h(c)
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}
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if c.Request().ContentLength >= 1 {
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if i < len(allowedContent) {
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return h(c)
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}
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}
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return code(415)
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}
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}
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}
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