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