mirror of
https://github.com/octoleo/restic.git
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185 lines
5.3 KiB
Go
185 lines
5.3 KiB
Go
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/*
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* Minio Go Library for Amazon S3 Compatible Cloud Storage (C) 2015, 2016 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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"net/http"
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"strconv"
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"strings"
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"time"
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"github.com/minio/minio-go/pkg/s3utils"
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)
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// BucketExists verify if bucket exists and you have permission to access it.
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func (c Client) BucketExists(bucketName string) (bool, error) {
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// Input validation.
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if err := s3utils.CheckValidBucketName(bucketName); err != nil {
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return false, err
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}
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// Execute HEAD on bucketName.
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resp, err := c.executeMethod("HEAD", requestMetadata{
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bucketName: bucketName,
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contentSHA256Bytes: emptySHA256,
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})
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defer closeResponse(resp)
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if err != nil {
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if ToErrorResponse(err).Code == "NoSuchBucket" {
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return false, nil
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}
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return false, err
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}
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if resp != nil {
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if resp.StatusCode != http.StatusOK {
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return false, httpRespToErrorResponse(resp, bucketName, "")
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}
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}
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return true, nil
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}
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// List of header keys to be filtered, usually
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// from all S3 API http responses.
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var defaultFilterKeys = []string{
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"Connection",
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"Transfer-Encoding",
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"Accept-Ranges",
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"Date",
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"Server",
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"Vary",
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"x-amz-bucket-region",
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"x-amz-request-id",
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"x-amz-id-2",
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// Add new headers to be ignored.
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}
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// Extract only necessary metadata header key/values by
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// filtering them out with a list of custom header keys.
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func extractObjMetadata(header http.Header) http.Header {
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filterKeys := append([]string{
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"ETag",
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"Content-Length",
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"Last-Modified",
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"Content-Type",
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}, defaultFilterKeys...)
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return filterHeader(header, filterKeys)
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}
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// StatObject verifies if object exists and you have permission to access.
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func (c Client) StatObject(bucketName, objectName string) (ObjectInfo, error) {
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// Input validation.
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if err := s3utils.CheckValidBucketName(bucketName); err != nil {
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return ObjectInfo{}, err
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}
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if err := s3utils.CheckValidObjectName(objectName); err != nil {
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return ObjectInfo{}, err
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}
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reqHeaders := NewHeadReqHeaders()
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return c.statObject(bucketName, objectName, reqHeaders)
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}
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// Lower level API for statObject supporting pre-conditions and range headers.
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func (c Client) statObject(bucketName, objectName string, reqHeaders RequestHeaders) (ObjectInfo, error) {
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// Input validation.
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if err := s3utils.CheckValidBucketName(bucketName); err != nil {
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return ObjectInfo{}, err
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}
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if err := s3utils.CheckValidObjectName(objectName); err != nil {
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return ObjectInfo{}, err
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}
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customHeader := make(http.Header)
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for k, v := range reqHeaders.Header {
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customHeader[k] = v
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}
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// Execute HEAD on objectName.
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resp, err := c.executeMethod("HEAD", requestMetadata{
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bucketName: bucketName,
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objectName: objectName,
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contentSHA256Bytes: emptySHA256,
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customHeader: customHeader,
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})
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defer closeResponse(resp)
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if err != nil {
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return ObjectInfo{}, err
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}
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if resp != nil {
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if resp.StatusCode != http.StatusOK {
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return ObjectInfo{}, httpRespToErrorResponse(resp, bucketName, objectName)
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}
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}
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// Trim off the odd double quotes from ETag in the beginning and end.
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md5sum := strings.TrimPrefix(resp.Header.Get("ETag"), "\"")
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md5sum = strings.TrimSuffix(md5sum, "\"")
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// Parse content length is exists
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var size int64 = -1
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contentLengthStr := resp.Header.Get("Content-Length")
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if contentLengthStr != "" {
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size, err = strconv.ParseInt(contentLengthStr, 10, 64)
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if err != nil {
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// Content-Length is not valid
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return ObjectInfo{}, ErrorResponse{
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Code: "InternalError",
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Message: "Content-Length is invalid. " + reportIssue,
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BucketName: bucketName,
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Key: objectName,
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RequestID: resp.Header.Get("x-amz-request-id"),
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HostID: resp.Header.Get("x-amz-id-2"),
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Region: resp.Header.Get("x-amz-bucket-region"),
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}
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}
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}
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// Parse Last-Modified has http time format.
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date, err := time.Parse(http.TimeFormat, resp.Header.Get("Last-Modified"))
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if err != nil {
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return ObjectInfo{}, ErrorResponse{
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Code: "InternalError",
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Message: "Last-Modified time format is invalid. " + reportIssue,
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BucketName: bucketName,
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Key: objectName,
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RequestID: resp.Header.Get("x-amz-request-id"),
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HostID: resp.Header.Get("x-amz-id-2"),
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Region: resp.Header.Get("x-amz-bucket-region"),
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}
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}
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// Fetch content type if any present.
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contentType := strings.TrimSpace(resp.Header.Get("Content-Type"))
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if contentType == "" {
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contentType = "application/octet-stream"
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}
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// Extract only the relevant header keys describing the object.
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// following function filters out a list of standard set of keys
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// which are not part of object metadata.
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metadata := extractObjMetadata(resp.Header)
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// Save object metadata info.
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return ObjectInfo{
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ETag: md5sum,
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Key: objectName,
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Size: size,
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LastModified: date,
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ContentType: contentType,
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Metadata: metadata,
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}, nil
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}
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