github.com/aacfactory/fns@v1.2.85/transports/middlewares/cors/header.go (about)

     1  /*
     2   * Copyright 2023 Wang Min Xiang
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   * 	http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   *
    16   */
    17  
    18  package cors
    19  
    20  import "bytes"
    21  
    22  var (
    23  	comma = []byte{','}
    24  )
    25  
    26  func parseHeaderList(headerList [][]byte) ([][]byte, bool) {
    27  	out := headerList
    28  	copied := false
    29  	for i, v := range headerList {
    30  		needsSplit := bytes.IndexByte(v, ',') != -1
    31  		if !copied {
    32  			if needsSplit {
    33  				split := bytes.Split(v, comma)
    34  				out = make([][]byte, i, len(headerList)+len(split)-1)
    35  				copy(out, headerList[:i])
    36  				for _, s := range split {
    37  					out = append(out, bytes.TrimSpace(s))
    38  				}
    39  				copied = true
    40  			}
    41  		} else {
    42  			if needsSplit {
    43  				split := bytes.Split(v, comma)
    44  				for _, s := range split {
    45  					out = append(out, bytes.TrimSpace(s))
    46  				}
    47  			} else {
    48  				out = append(out, v)
    49  			}
    50  		}
    51  	}
    52  	return out, copied
    53  }