1 files changed, 197 insertions, 0 deletions
diff --git a/vendor/github.com/minio/minio-go/bucket-cache.go b/vendor/github.com/minio/minio-go/bucket-cache.go
new file mode 100644
index 000000000..4ad106959
--- /dev/null
+++ b/vendor/github.com/minio/minio-go/bucket-cache.go
@@ -0,0 +1,197 @@
+/*
+ * Minio Go Library for Amazon S3 Compatible Cloud Storage (C) 2015 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 (
+	"encoding/hex"
+	"net/http"
+	"net/url"
+	"path"
+	"strings"
+	"sync"
+)
+
+// bucketLocationCache - Provides simple mechanism to hold bucket
+// locations in memory.
+type bucketLocationCache struct {
+	// mutex is used for handling the concurrent
+	// read/write requests for cache.
+	sync.RWMutex
+
+	// items holds the cached bucket locations.
+	items map[string]string
+}
+
+// newBucketLocationCache - Provides a new bucket location cache to be
+// used internally with the client object.
+func newBucketLocationCache() *bucketLocationCache {
+	return &bucketLocationCache{
+		items: make(map[string]string),
+	}
+}
+
+// Get - Returns a value of a given key if it exists.
+func (r *bucketLocationCache) Get(bucketName string) (location string, ok bool) {
+	r.RLock()
+	defer r.RUnlock()
+	location, ok = r.items[bucketName]
+	return
+}
+
+// Set - Will persist a value into cache.
+func (r *bucketLocationCache) Set(bucketName string, location string) {
+	r.Lock()
+	defer r.Unlock()
+	r.items[bucketName] = location
+}
+
+// Delete - Deletes a bucket name from cache.
+func (r *bucketLocationCache) Delete(bucketName string) {
+	r.Lock()
+	defer r.Unlock()
+	delete(r.items, bucketName)
+}
+
+// GetBucketLocation - get location for the bucket name from location cache, if not
+// fetch freshly by making a new request.
+func (c Client) GetBucketLocation(bucketName string) (string, error) {
+	if err := isValidBucketName(bucketName); err != nil {
+		return "", err
+	}
+	return c.getBucketLocation(bucketName)
+}
+
+// getBucketLocation - Get location for the bucketName from location map cache, if not
+// fetch freshly by making a new request.
+func (c Client) getBucketLocation(bucketName string) (string, error) {
+	if err := isValidBucketName(bucketName); err != nil {
+		return "", err
+	}
+	if location, ok := c.bucketLocCache.Get(bucketName); ok {
+		return location, nil
+	}
+
+	if isAmazonChinaEndpoint(c.endpointURL) {
+		// For china specifically we need to set everything to
+		// cn-north-1 for now, there is no easier way until AWS S3
+		// provides a cleaner compatible API across "us-east-1" and
+		// China region.
+		return "cn-north-1", nil
+	}
+
+	// Initialize a new request.
+	req, err := c.getBucketLocationRequest(bucketName)
+	if err != nil {
+		return "", err
+	}
+
+	// Initiate the request.
+	resp, err := c.do(req)
+	defer closeResponse(resp)
+	if err != nil {
+		return "", err
+	}
+	location, err := processBucketLocationResponse(resp, bucketName)
+	if err != nil {
+		return "", err
+	}
+	c.bucketLocCache.Set(bucketName, location)
+	return location, nil
+}
+
+// processes the getBucketLocation http response from the server.
+func processBucketLocationResponse(resp *http.Response, bucketName string) (bucketLocation string, err error) {
+	if resp != nil {
+		if resp.StatusCode != http.StatusOK {
+			err = httpRespToErrorResponse(resp, bucketName, "")
+			errResp := ToErrorResponse(err)
+			// For access denied error, it could be an anonymous
+			// request. Move forward and let the top level callers
+			// succeed if possible based on their policy.
+			if errResp.Code == "AccessDenied" && strings.Contains(errResp.Message, "Access Denied") {
+				return "us-east-1", nil
+			}
+			return "", err
+		}
+	}
+
+	// Extract location.
+	var locationConstraint string
+	err = xmlDecoder(resp.Body, &locationConstraint)
+	if err != nil {
+		return "", err
+	}
+
+	location := locationConstraint
+	// Location is empty will be 'us-east-1'.
+	if location == "" {
+		location = "us-east-1"
+	}
+
+	// Location can be 'EU' convert it to meaningful 'eu-west-1'.
+	if location == "EU" {
+		location = "eu-west-1"
+	}
+
+	// Save the location into cache.
+
+	// Return.
+	return location, nil
+}
+
+// getBucketLocationRequest - Wrapper creates a new getBucketLocation request.
+func (c Client) getBucketLocationRequest(bucketName string) (*http.Request, error) {
+	// Set location query.
+	urlValues := make(url.Values)
+	urlValues.Set("location", "")
+
+	// Set get bucket location always as path style.
+	targetURL, err := url.Parse(c.endpointURL)
+	if err != nil {
+		return nil, err
+	}
+	targetURL.Path = path.Join(bucketName, "") + "/"
+	targetURL.RawQuery = urlValues.Encode()
+
+	// Get a new HTTP request for the method.
+	req, err := http.NewRequest("GET", targetURL.String(), nil)
+	if err != nil {
+		return nil, err
+	}
+
+	// Set UserAgent for the request.
+	c.setUserAgent(req)
+
+	// Set sha256 sum for signature calculation only with signature version '4'.
+	if c.signature.isV4() {
+		var contentSha256 string
+		if c.secure {
+			contentSha256 = unsignedPayload
+		} else {
+			contentSha256 = hex.EncodeToString(sum256([]byte{}))
+		}
+		req.Header.Set("X-Amz-Content-Sha256", contentSha256)
+	}
+
+	// Sign the request.
+	if c.signature.isV4() {
+		req = signV4(*req, c.accessKeyID, c.secretAccessKey, "us-east-1")
+	} else if c.signature.isV2() {
+		req = signV2(*req, c.accessKeyID, c.secretAccessKey)
+	}
+	return req, nil
+}