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package s3api
import (
"encoding/xml"
"fmt"
"net/url"
"regexp"
"sort"
"strings"
"github.com/seaweedfs/seaweedfs/weed/util"
)
type Tag struct {
Key string `xml:"Key"`
Value string `xml:"Value"`
}
type TagSet struct {
Tag []Tag `xml:"Tag"`
}
type Tagging struct {
XMLName xml.Name `xml:"Tagging"`
TagSet TagSet `xml:"TagSet"`
Xmlns string `xml:"xmlns,attr"`
}
func (t *Tagging) ToTags() map[string]string {
output := make(map[string]string)
for _, tag := range t.TagSet.Tag {
output[tag.Key] = tag.Value
}
return output
}
func FromTags(tags map[string]string) (t *Tagging) {
t = &Tagging{Xmlns: "http://s3.amazonaws.com/doc/2006-03-01/"}
for k, v := range tags {
t.TagSet.Tag = append(t.TagSet.Tag, Tag{
Key: k,
Value: v,
})
}
if tagArr := t.TagSet.Tag; len(tagArr) > 0 {
sort.SliceStable(tagArr, func(i, j int) bool {
return tagArr[i].Key < tagArr[j].Key
})
}
return
}
func parseTagsHeader(tags string) (map[string]string, error) {
parsedTags := make(map[string]string)
for _, v := range util.StringSplit(tags, "&") {
tag := strings.Split(v, "=")
if len(tag) == 2 {
// URL decode both key and value
decodedKey, err := url.QueryUnescape(tag[0])
if err != nil {
return nil, fmt.Errorf("failed to decode tag key '%s': %w", tag[0], err)
}
decodedValue, err := url.QueryUnescape(tag[1])
if err != nil {
return nil, fmt.Errorf("failed to decode tag value '%s': %w", tag[1], err)
}
parsedTags[decodedKey] = decodedValue
} else if len(tag) == 1 {
// URL decode key for empty value tags
decodedKey, err := url.QueryUnescape(tag[0])
if err != nil {
return nil, fmt.Errorf("failed to decode tag key '%s': %w", tag[0], err)
}
parsedTags[decodedKey] = ""
}
}
return parsedTags, nil
}
func ValidateTags(tags map[string]string) error {
if len(tags) > 10 {
return fmt.Errorf("validate tags: %d tags more than 10", len(tags))
}
for k, v := range tags {
if len(k) > 128 {
return fmt.Errorf("validate tags: tag key longer than 128")
}
validateKey, err := regexp.MatchString(`^([\p{L}\p{Z}\p{N}_.:/=+\-@]*)$`, k)
if !validateKey || err != nil {
return fmt.Errorf("validate tags key %s error, incorrect key", k)
}
if len(v) > 256 {
return fmt.Errorf("validate tags: tag value longer than 256")
}
validateValue, err := regexp.MatchString(`^([\p{L}\p{Z}\p{N}_.:/=+\-@]*)$`, v)
if !validateValue || err != nil {
return fmt.Errorf("validate tags value %s error, incorrect value", v)
}
}
return nil
}
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