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/*
* Minio Go Library for Amazon S3 Compatible Cloud Storage (C) 2016-17 Minio, Inc.
*
* 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 minio
import (
"fmt"
"net/http"
"time"
)
// RequestHeaders - implement methods for setting special
// request headers for GET, HEAD object operations.
// http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectGET.html
type RequestHeaders struct {
http.Header
}
// NewGetReqHeaders - initializes a new request headers for GET request.
func NewGetReqHeaders() RequestHeaders {
return RequestHeaders{
Header: make(http.Header),
}
}
// NewHeadReqHeaders - initializes a new request headers for HEAD request.
func NewHeadReqHeaders() RequestHeaders {
return RequestHeaders{
Header: make(http.Header),
}
}
// SetMatchETag - set match etag.
func (c RequestHeaders) SetMatchETag(etag string) error {
if etag == "" {
return ErrInvalidArgument("ETag cannot be empty.")
}
c.Set("If-Match", "\""+etag+"\"")
return nil
}
// SetMatchETagExcept - set match etag except.
func (c RequestHeaders) SetMatchETagExcept(etag string) error {
if etag == "" {
return ErrInvalidArgument("ETag cannot be empty.")
}
c.Set("If-None-Match", "\""+etag+"\"")
return nil
}
// SetUnmodified - set unmodified time since.
func (c RequestHeaders) SetUnmodified(modTime time.Time) error {
if modTime.IsZero() {
return ErrInvalidArgument("Modified since cannot be empty.")
}
c.Set("If-Unmodified-Since", modTime.Format(http.TimeFormat))
return nil
}
// SetModified - set modified time since.
func (c RequestHeaders) SetModified(modTime time.Time) error {
if modTime.IsZero() {
return ErrInvalidArgument("Modified since cannot be empty.")
}
c.Set("If-Modified-Since", modTime.Format(http.TimeFormat))
return nil
}
// SetRange - set the start and end offset of the object to be read.
// See https://tools.ietf.org/html/rfc7233#section-3.1 for reference.
func (c RequestHeaders) SetRange(start, end int64) error {
switch {
case start == 0 && end < 0:
// Read last '-end' bytes. `bytes=-N`.
c.Set("Range", fmt.Sprintf("bytes=%d", end))
case 0 < start && end == 0:
// Read everything starting from offset
// 'start'. `bytes=N-`.
c.Set("Range", fmt.Sprintf("bytes=%d-", start))
case 0 <= start && start <= end:
// Read everything starting at 'start' till the
// 'end'. `bytes=N-M`
c.Set("Range", fmt.Sprintf("bytes=%d-%d", start, end))
default:
// All other cases such as
// bytes=-3-
// bytes=5-3
// bytes=-2-4
// bytes=-3-0
// bytes=-3--2
// are invalid.
return ErrInvalidArgument(
fmt.Sprintf(
"Invalid range specified: start=%d end=%d",
start, end))
}
return nil
}
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