mirror of https://github.com/minio/minio.git
120 lines
3.8 KiB
Go
120 lines
3.8 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2019 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 lifecycle
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import (
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"encoding/xml"
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"errors"
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"time"
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)
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var (
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errLifecycleInvalidDate = errors.New("Date must be provided in ISO 8601 format")
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errLifecycleInvalidDays = errors.New("Days must be positive integer when used with Expiration")
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errLifecycleInvalidExpiration = errors.New("At least one of Days or Date should be present inside Expiration")
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errLifecycleDateNotMidnight = errors.New(" 'Date' must be at midnight GMT")
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)
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// ExpirationDays is a type alias to unmarshal Days in Expiration
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type ExpirationDays int
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// UnmarshalXML parses number of days from Expiration and validates if
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// greater than zero
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func (eDays *ExpirationDays) UnmarshalXML(d *xml.Decoder, startElement xml.StartElement) error {
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var numDays int
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err := d.DecodeElement(&numDays, &startElement)
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if err != nil {
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return err
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}
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if numDays <= 0 {
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return errLifecycleInvalidDays
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}
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*eDays = ExpirationDays(numDays)
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return nil
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}
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// MarshalXML encodes number of days to expire if it is non-zero and
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// encodes empty string otherwise
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func (eDays *ExpirationDays) MarshalXML(e *xml.Encoder, startElement xml.StartElement) error {
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if *eDays == ExpirationDays(0) {
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return nil
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}
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return e.EncodeElement(int(*eDays), startElement)
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}
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// ExpirationDate is a embedded type containing time.Time to unmarshal
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// Date in Expiration
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type ExpirationDate struct {
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time.Time
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}
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// UnmarshalXML parses date from Expiration and validates date format
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func (eDate *ExpirationDate) UnmarshalXML(d *xml.Decoder, startElement xml.StartElement) error {
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var dateStr string
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err := d.DecodeElement(&dateStr, &startElement)
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if err != nil {
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return err
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}
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// While AWS documentation mentions that the date specified
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// must be present in ISO 8601 format, in reality they allow
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// users to provide RFC 3339 compliant dates.
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expDate, err := time.Parse(time.RFC3339, dateStr)
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if err != nil {
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return errLifecycleInvalidDate
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}
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// Allow only date timestamp specifying midnight GMT
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hr, min, sec := expDate.Clock()
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nsec := expDate.Nanosecond()
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loc := expDate.Location()
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if !(hr == 0 && min == 0 && sec == 0 && nsec == 0 && loc.String() == time.UTC.String()) {
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return errLifecycleDateNotMidnight
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}
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*eDate = ExpirationDate{expDate}
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return nil
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}
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// MarshalXML encodes expiration date if it is non-zero and encodes
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// empty string otherwise
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func (eDate *ExpirationDate) MarshalXML(e *xml.Encoder, startElement xml.StartElement) error {
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if *eDate == (ExpirationDate{time.Time{}}) {
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return nil
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}
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return e.EncodeElement(eDate.Format(time.RFC3339), startElement)
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}
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// Expiration - expiration actions for a rule in lifecycle configuration.
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type Expiration struct {
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XMLName xml.Name `xml:"Expiration"`
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Days ExpirationDays `xml:"Days,omitempty"`
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Date ExpirationDate `xml:"Date,omitempty"`
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}
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// Validate - validates the "Expiration" element
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func (e Expiration) Validate() error {
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// Neither expiration days or date is specified
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if e.Days == ExpirationDays(0) && e.Date == (ExpirationDate{time.Time{}}) {
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return errLifecycleInvalidExpiration
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}
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// Both expiration days and date are specified
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if e.Days != ExpirationDays(0) && e.Date != (ExpirationDate{time.Time{}}) {
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return errLifecycleInvalidExpiration
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}
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return nil
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}
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