mirror of
https://github.com/octoleo/restic.git
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306 lines
9.5 KiB
Go
306 lines
9.5 KiB
Go
/*
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* Minio Go Library for Amazon S3 Compatible Cloud Storage (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 minio
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import (
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"crypto/hmac"
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"crypto/sha256"
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"encoding/hex"
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"encoding/xml"
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"io"
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"io/ioutil"
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"net"
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"net/http"
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"net/url"
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"regexp"
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"strings"
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"time"
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"unicode/utf8"
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)
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// xmlDecoder provide decoded value in xml.
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func xmlDecoder(body io.Reader, v interface{}) error {
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d := xml.NewDecoder(body)
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return d.Decode(v)
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}
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// sum256 calculate sha256 sum for an input byte array.
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func sum256(data []byte) []byte {
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hash := sha256.New()
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hash.Write(data)
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return hash.Sum(nil)
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}
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// sumHMAC calculate hmac between two input byte array.
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func sumHMAC(key []byte, data []byte) []byte {
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hash := hmac.New(sha256.New, key)
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hash.Write(data)
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return hash.Sum(nil)
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}
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// getEndpointURL - construct a new endpoint.
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func getEndpointURL(endpoint string, inSecure bool) (*url.URL, error) {
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if strings.Contains(endpoint, ":") {
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host, _, err := net.SplitHostPort(endpoint)
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if err != nil {
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return nil, err
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}
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if !isValidIP(host) && !isValidDomain(host) {
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msg := "Endpoint: " + endpoint + " does not follow ip address or domain name standards."
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return nil, ErrInvalidArgument(msg)
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}
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} else {
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if !isValidIP(endpoint) && !isValidDomain(endpoint) {
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msg := "Endpoint: " + endpoint + " does not follow ip address or domain name standards."
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return nil, ErrInvalidArgument(msg)
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}
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}
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// if inSecure is true, use 'http' scheme.
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scheme := "https"
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if inSecure {
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scheme = "http"
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}
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// Construct a secured endpoint URL.
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endpointURLStr := scheme + "://" + endpoint
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endpointURL, err := url.Parse(endpointURLStr)
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if err != nil {
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return nil, err
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}
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// Validate incoming endpoint URL.
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if err := isValidEndpointURL(endpointURL); err != nil {
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return nil, err
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}
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return endpointURL, nil
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}
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// isValidDomain validates if input string is a valid domain name.
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func isValidDomain(host string) bool {
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// See RFC 1035, RFC 3696.
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host = strings.TrimSpace(host)
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if len(host) == 0 || len(host) > 255 {
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return false
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}
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// host cannot start or end with "-"
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if host[len(host)-1:] == "-" || host[:1] == "-" {
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return false
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}
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// host cannot start or end with "_"
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if host[len(host)-1:] == "_" || host[:1] == "_" {
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return false
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}
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// host cannot start or end with a "."
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if host[len(host)-1:] == "." || host[:1] == "." {
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return false
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}
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// All non alphanumeric characters are invalid.
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if strings.ContainsAny(host, "`~!@#$%^&*()+={}[]|\\\"';:><?/") {
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return false
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}
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// No need to regexp match, since the list is non-exhaustive.
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// We let it valid and fail later.
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return true
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}
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// isValidIP parses input string for ip address validity.
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func isValidIP(ip string) bool {
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return net.ParseIP(ip) != nil
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}
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// closeResponse close non nil response with any response Body.
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// convenient wrapper to drain any remaining data on response body.
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//
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// Subsequently this allows golang http RoundTripper
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// to re-use the same connection for future requests.
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func closeResponse(resp *http.Response) {
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// Callers should close resp.Body when done reading from it.
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// If resp.Body is not closed, the Client's underlying RoundTripper
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// (typically Transport) may not be able to re-use a persistent TCP
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// connection to the server for a subsequent "keep-alive" request.
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if resp != nil && resp.Body != nil {
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// Drain any remaining Body and then close the connection.
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// Without this closing connection would disallow re-using
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// the same connection for future uses.
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// - http://stackoverflow.com/a/17961593/4465767
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io.Copy(ioutil.Discard, resp.Body)
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resp.Body.Close()
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}
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}
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// isVirtualHostSupported - verifies if bucketName can be part of
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// virtual host. Currently only Amazon S3 and Google Cloud Storage would
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// support this.
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func isVirtualHostSupported(endpointURL *url.URL, bucketName string) bool {
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// bucketName can be valid but '.' in the hostname will fail SSL
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// certificate validation. So do not use host-style for such buckets.
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if endpointURL.Scheme == "https" && strings.Contains(bucketName, ".") {
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return false
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}
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// Return true for all other cases
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return isAmazonEndpoint(endpointURL) || isGoogleEndpoint(endpointURL)
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}
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// Match if it is exactly Amazon S3 endpoint.
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func isAmazonEndpoint(endpointURL *url.URL) bool {
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if endpointURL == nil {
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return false
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}
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if endpointURL.Host == "s3.amazonaws.com" {
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return true
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}
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return false
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}
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// Match if it is exactly Google cloud storage endpoint.
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func isGoogleEndpoint(endpointURL *url.URL) bool {
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if endpointURL == nil {
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return false
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}
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if endpointURL.Host == "storage.googleapis.com" {
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return true
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}
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return false
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}
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// Verify if input endpoint URL is valid.
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func isValidEndpointURL(endpointURL *url.URL) error {
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if endpointURL == nil {
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return ErrInvalidArgument("Endpoint url cannot be empty.")
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}
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if endpointURL.Path != "/" && endpointURL.Path != "" {
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return ErrInvalidArgument("Endpoing url cannot have fully qualified paths.")
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}
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if strings.Contains(endpointURL.Host, ".amazonaws.com") {
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if !isAmazonEndpoint(endpointURL) {
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return ErrInvalidArgument("Amazon S3 endpoint should be 's3.amazonaws.com'.")
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}
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}
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if strings.Contains(endpointURL.Host, ".googleapis.com") {
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if !isGoogleEndpoint(endpointURL) {
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return ErrInvalidArgument("Google Cloud Storage endpoint should be 'storage.googleapis.com'.")
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}
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}
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return nil
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}
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// Verify if input expires value is valid.
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func isValidExpiry(expires time.Duration) error {
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expireSeconds := int64(expires / time.Second)
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if expireSeconds < 1 {
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return ErrInvalidArgument("Expires cannot be lesser than 1 second.")
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}
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if expireSeconds > 604800 {
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return ErrInvalidArgument("Expires cannot be greater than 7 days.")
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}
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return nil
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}
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// We support '.' with bucket names but we fallback to using path
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// style requests instead for such buckets.
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var validBucketName = regexp.MustCompile(`^[a-z0-9][a-z0-9\.\-]{1,61}[a-z0-9]$`)
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// isValidBucketName - verify bucket name in accordance with
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// - http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingBucket.html
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func isValidBucketName(bucketName string) error {
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if strings.TrimSpace(bucketName) == "" {
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return ErrInvalidBucketName("Bucket name cannot be empty.")
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}
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if len(bucketName) < 3 {
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return ErrInvalidBucketName("Bucket name cannot be smaller than 3 characters.")
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}
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if len(bucketName) > 63 {
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return ErrInvalidBucketName("Bucket name cannot be greater than 63 characters.")
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}
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if bucketName[0] == '.' || bucketName[len(bucketName)-1] == '.' {
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return ErrInvalidBucketName("Bucket name cannot start or end with a '.' dot.")
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}
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if match, _ := regexp.MatchString("\\.\\.", bucketName); match == true {
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return ErrInvalidBucketName("Bucket name cannot have successive periods.")
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}
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if !validBucketName.MatchString(bucketName) {
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return ErrInvalidBucketName("Bucket name contains invalid characters.")
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}
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return nil
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}
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// isValidObjectName - verify object name in accordance with
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// - http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMetadata.html
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func isValidObjectName(objectName string) error {
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if strings.TrimSpace(objectName) == "" {
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return ErrInvalidObjectName("Object name cannot be empty.")
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}
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if len(objectName) > 1024 {
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return ErrInvalidObjectName("Object name cannot be greater than 1024 characters.")
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}
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if !utf8.ValidString(objectName) {
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return ErrInvalidBucketName("Object name with non UTF-8 strings are not supported.")
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}
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return nil
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}
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// isValidObjectPrefix - verify if object prefix is valid.
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func isValidObjectPrefix(objectPrefix string) error {
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if len(objectPrefix) > 1024 {
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return ErrInvalidObjectPrefix("Object prefix cannot be greater than 1024 characters.")
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}
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if !utf8.ValidString(objectPrefix) {
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return ErrInvalidObjectPrefix("Object prefix with non UTF-8 strings are not supported.")
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}
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return nil
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}
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// urlEncodePath encode the strings from UTF-8 byte representations to HTML hex escape sequences
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//
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// This is necessary since regular url.Parse() and url.Encode() functions do not support UTF-8
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// non english characters cannot be parsed due to the nature in which url.Encode() is written
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//
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// This function on the other hand is a direct replacement for url.Encode() technique to support
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// pretty much every UTF-8 character.
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func urlEncodePath(pathName string) string {
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// if object matches reserved string, no need to encode them
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reservedNames := regexp.MustCompile("^[a-zA-Z0-9-_.~/]+$")
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if reservedNames.MatchString(pathName) {
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return pathName
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}
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var encodedPathname string
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for _, s := range pathName {
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if 'A' <= s && s <= 'Z' || 'a' <= s && s <= 'z' || '0' <= s && s <= '9' { // §2.3 Unreserved characters (mark)
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encodedPathname = encodedPathname + string(s)
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continue
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}
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switch s {
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case '-', '_', '.', '~', '/': // §2.3 Unreserved characters (mark)
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encodedPathname = encodedPathname + string(s)
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continue
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default:
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len := utf8.RuneLen(s)
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if len < 0 {
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// if utf8 cannot convert return the same string as is
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return pathName
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}
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u := make([]byte, len)
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utf8.EncodeRune(u, s)
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for _, r := range u {
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hex := hex.EncodeToString([]byte{r})
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encodedPathname = encodedPathname + "%" + strings.ToUpper(hex)
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}
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}
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}
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return encodedPathname
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}
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