Vendor dependencies with dep

vendor/github.com/minio/minio-go/utils.go

@@ -0,0 +1,214 @@
+/*
+ * 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 (
+	"crypto/md5"
+	"crypto/sha256"
+	"encoding/xml"
+	"io"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"net/url"
+	"regexp"
+	"strings"
+	"time"
+
+	"github.com/minio/minio-go/pkg/s3utils"
+)
+
+// xmlDecoder provide decoded value in xml.
+func xmlDecoder(body io.Reader, v interface{}) error {
+	d := xml.NewDecoder(body)
+	return d.Decode(v)
+}
+
+// sum256 calculate sha256 sum for an input byte array.
+func sum256(data []byte) []byte {
+	hash := sha256.New()
+	hash.Write(data)
+	return hash.Sum(nil)
+}
+
+// sumMD5 calculate sumMD5 sum for an input byte array.
+func sumMD5(data []byte) []byte {
+	hash := md5.New()
+	hash.Write(data)
+	return hash.Sum(nil)
+}
+
+// getEndpointURL - construct a new endpoint.
+func getEndpointURL(endpoint string, secure bool) (*url.URL, error) {
+	if strings.Contains(endpoint, ":") {
+		host, _, err := net.SplitHostPort(endpoint)
+		if err != nil {
+			return nil, err
+		}
+		if !s3utils.IsValidIP(host) && !s3utils.IsValidDomain(host) {
+			msg := "Endpoint: " + endpoint + " does not follow ip address or domain name standards."
+			return nil, ErrInvalidArgument(msg)
+		}
+	} else {
+		if !s3utils.IsValidIP(endpoint) && !s3utils.IsValidDomain(endpoint) {
+			msg := "Endpoint: " + endpoint + " does not follow ip address or domain name standards."
+			return nil, ErrInvalidArgument(msg)
+		}
+	}
+	// If secure is false, use 'http' scheme.
+	scheme := "https"
+	if !secure {
+		scheme = "http"
+	}
+
+	// Construct a secured endpoint URL.
+	endpointURLStr := scheme + "://" + endpoint
+	endpointURL, err := url.Parse(endpointURLStr)
+	if err != nil {
+		return nil, err
+	}
+
+	// Validate incoming endpoint URL.
+	if err := isValidEndpointURL(*endpointURL); err != nil {
+		return nil, err
+	}
+	return endpointURL, nil
+}
+
+// closeResponse close non nil response with any response Body.
+// convenient wrapper to drain any remaining data on response body.
+//
+// Subsequently this allows golang http RoundTripper
+// to re-use the same connection for future requests.
+func closeResponse(resp *http.Response) {
+	// Callers should close resp.Body when done reading from it.
+	// If resp.Body is not closed, the Client's underlying RoundTripper
+	// (typically Transport) may not be able to re-use a persistent TCP
+	// connection to the server for a subsequent "keep-alive" request.
+	if resp != nil && resp.Body != nil {
+		// Drain any remaining Body and then close the connection.
+		// Without this closing connection would disallow re-using
+		// the same connection for future uses.
+		//  - http://stackoverflow.com/a/17961593/4465767
+		io.Copy(ioutil.Discard, resp.Body)
+		resp.Body.Close()
+	}
+}
+
+var emptySHA256 = sum256(nil)
+
+// Sentinel URL is the default url value which is invalid.
+var sentinelURL = url.URL{}
+
+// Verify if input endpoint URL is valid.
+func isValidEndpointURL(endpointURL url.URL) error {
+	if endpointURL == sentinelURL {
+		return ErrInvalidArgument("Endpoint url cannot be empty.")
+	}
+	if endpointURL.Path != "/" && endpointURL.Path != "" {
+		return ErrInvalidArgument("Endpoint url cannot have fully qualified paths.")
+	}
+	if strings.Contains(endpointURL.Host, ".s3.amazonaws.com") {
+		if !s3utils.IsAmazonEndpoint(endpointURL) {
+			return ErrInvalidArgument("Amazon S3 endpoint should be 's3.amazonaws.com'.")
+		}
+	}
+	if strings.Contains(endpointURL.Host, ".googleapis.com") {
+		if !s3utils.IsGoogleEndpoint(endpointURL) {
+			return ErrInvalidArgument("Google Cloud Storage endpoint should be 'storage.googleapis.com'.")
+		}
+	}
+	return nil
+}
+
+// Verify if input expires value is valid.
+func isValidExpiry(expires time.Duration) error {
+	expireSeconds := int64(expires / time.Second)
+	if expireSeconds < 1 {
+		return ErrInvalidArgument("Expires cannot be lesser than 1 second.")
+	}
+	if expireSeconds > 604800 {
+		return ErrInvalidArgument("Expires cannot be greater than 7 days.")
+	}
+	return nil
+}
+
+// make a copy of http.Header
+func cloneHeader(h http.Header) http.Header {
+	h2 := make(http.Header, len(h))
+	for k, vv := range h {
+		vv2 := make([]string, len(vv))
+		copy(vv2, vv)
+		h2[k] = vv2
+	}
+	return h2
+}
+
+// Filter relevant response headers from
+// the HEAD, GET http response. The function takes
+// a list of headers which are filtered out and
+// returned as a new http header.
+func filterHeader(header http.Header, filterKeys []string) (filteredHeader http.Header) {
+	filteredHeader = cloneHeader(header)
+	for _, key := range filterKeys {
+		filteredHeader.Del(key)
+	}
+	return filteredHeader
+}
+
+// regCred matches credential string in HTTP header
+var regCred = regexp.MustCompile("Credential=([A-Z0-9]+)/")
+
+// regCred matches signature string in HTTP header
+var regSign = regexp.MustCompile("Signature=([[0-9a-f]+)")
+
+// Redact out signature value from authorization string.
+func redactSignature(origAuth string) string {
+	if !strings.HasPrefix(origAuth, signV4Algorithm) {
+		// Set a temporary redacted auth
+		return "AWS **REDACTED**:**REDACTED**"
+	}
+
+	/// Signature V4 authorization header.
+
+	// Strip out accessKeyID from:
+	// Credential=<access-key-id>/<date>/<aws-region>/<aws-service>/aws4_request
+	newAuth := regCred.ReplaceAllString(origAuth, "Credential=**REDACTED**/")
+
+	// Strip out 256-bit signature from: Signature=<256-bit signature>
+	return regSign.ReplaceAllString(newAuth, "Signature=**REDACTED**")
+}
+
+// Get default location returns the location based on the input
+// URL `u`, if region override is provided then all location
+// defaults to regionOverride.
+//
+// If no other cases match then the location is set to `us-east-1`
+// as a last resort.
+func getDefaultLocation(u url.URL, regionOverride string) (location string) {
+	if regionOverride != "" {
+		return regionOverride
+	}
+	if s3utils.IsAmazonChinaEndpoint(u) {
+		return "cn-north-1"
+	}
+	if s3utils.IsAmazonGovCloudEndpoint(u) {
+		return "us-gov-west-1"
+	}
+	// Default to location to 'us-east-1'.
+	return "us-east-1"
+}