mirror of
https://github.com/minio/mc.git
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105 lines
2.9 KiB
Go
105 lines
2.9 KiB
Go
/*
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* Minio Client (C) 2015 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 s3
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import (
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"fmt"
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"io"
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"strings"
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"net/http"
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"github.com/minio-io/mc/pkg/client"
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"github.com/minio-io/minio/pkg/iodine"
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)
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/// Object API operations
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func (c *s3Client) setRange(req *http.Request, offset, length int64) (*http.Request, error) {
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if offset < 0 {
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return nil, iodine.New(client.InvalidRange{Offset: offset}, nil)
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}
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if length >= 0 {
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req.Header.Set("Range", fmt.Sprintf("bytes=%d-%d", offset, offset+length-1))
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} else {
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req.Header.Set("Range", fmt.Sprintf("bytes=%d-", offset))
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}
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return req, nil
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}
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func (c *s3Client) get() (*http.Request, error) {
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queryURL, err := c.getRequestURL()
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if err != nil {
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return nil, iodine.New(err, nil)
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}
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if !c.isValidQueryURL(queryURL) {
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return nil, iodine.New(InvalidQueryURL{URL: queryURL}, nil)
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}
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req, err := c.newRequest("GET", queryURL, nil)
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if err != nil {
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return nil, iodine.New(err, nil)
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}
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return req, nil
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}
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// Get - download a requested object from a given bucket
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func (c *s3Client) Get() (body io.ReadCloser, size int64, md5 string, err error) {
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req, err := c.get()
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if err != nil {
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return nil, 0, "", iodine.New(err, nil)
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}
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if c.AccessKeyID != "" && c.SecretAccessKey != "" {
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c.signRequest(req, c.Host)
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}
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res, err := c.Transport.RoundTrip(req)
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if err != nil {
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return nil, 0, "", iodine.New(err, nil)
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}
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if res.StatusCode != http.StatusOK {
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return nil, 0, "", iodine.New(NewError(res), nil)
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}
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md5sum := strings.Trim(res.Header.Get("ETag"), "\"") // trim off the erroneous double quotes
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return res.Body, res.ContentLength, md5sum, nil
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}
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// GetPartial fetches part of the s3 object in bucket.
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// If length is negative, the rest of the object is returned.
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func (c *s3Client) GetPartial(offset, length int64) (body io.ReadCloser, size int64, md5 string, err error) {
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req, err := c.get()
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if err != nil {
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return nil, 0, "", iodine.New(err, nil)
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}
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req, err = c.setRange(req, offset, length)
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if err != nil {
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return nil, 0, "", iodine.New(err, nil)
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}
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if c.AccessKeyID != "" && c.SecretAccessKey != "" {
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c.signRequest(req, c.Host)
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}
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res, err := c.Transport.RoundTrip(req)
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if err != nil {
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return nil, 0, "", iodine.New(err, nil)
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}
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switch res.StatusCode {
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case http.StatusOK, http.StatusPartialContent:
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return res.Body, res.ContentLength, res.Header.Get("ETag"), nil
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default:
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return nil, 0, "", iodine.New(NewError(res), nil)
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}
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}
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