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/*
* MinIO Go Library for Amazon S3 Compatible Cloud Storage
* Copyright 2015-2024 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 cors
import (
"encoding/xml"
"fmt"
"io"
"strings"
"github.com/dustin/go-humanize"
)
const defaultXMLNS = "http://s3.amazonaws.com/doc/2006-03-01/"
// Config is the container for a CORS configuration for a bucket.
type Config struct {
XMLNS string `xml:"xmlns,attr,omitempty"`
XMLName xml.Name `xml:"CORSConfiguration"`
CORSRules []Rule `xml:"CORSRule"`
}
// Rule is a single rule in a CORS configuration.
type Rule struct {
AllowedHeader []string `xml:"AllowedHeader,omitempty"`
AllowedMethod []string `xml:"AllowedMethod,omitempty"`
AllowedOrigin []string `xml:"AllowedOrigin,omitempty"`
ExposeHeader []string `xml:"ExposeHeader,omitempty"`
ID string `xml:"ID,omitempty"`
MaxAgeSeconds int `xml:"MaxAgeSeconds,omitempty"`
}
// NewConfig creates a new CORS configuration with the given rules.
func NewConfig(rules []Rule) *Config {
return &Config{
XMLNS: defaultXMLNS,
XMLName: xml.Name{
Local: "CORSConfiguration",
Space: defaultXMLNS,
},
CORSRules: rules,
}
}
// ParseBucketCorsConfig parses a CORS configuration in XML from an io.Reader.
func ParseBucketCorsConfig(reader io.Reader) (*Config, error) {
var c Config
// Max size of cors document is 64KiB according to https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutBucketCors.html
// This limiter is just for safety so has a max of 128KiB
err := xml.NewDecoder(io.LimitReader(reader, 128*humanize.KiByte)).Decode(&c)
if err != nil {
return nil, fmt.Errorf("decoding xml: %w", err)
}
if c.XMLNS == "" {
c.XMLNS = defaultXMLNS
}
for i, rule := range c.CORSRules {
for j, method := range rule.AllowedMethod {
c.CORSRules[i].AllowedMethod[j] = strings.ToUpper(method)
}
}
return &c, nil
}
// ToXML marshals the CORS configuration to XML.
func (c Config) ToXML() ([]byte, error) {
if c.XMLNS == "" {
c.XMLNS = defaultXMLNS
}
data, err := xml.Marshal(&c)
if err != nil {
return nil, fmt.Errorf("marshaling xml: %w", err)
}
return append([]byte(xml.Header), data...), nil
}
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