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field_time.go
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field_time.go
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/******************************************************************************
*
* Copyright 2018 Stefan Majewsky <majewsky@gmx.net>
*
* 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 schwift
import (
"net/http"
"strconv"
"time"
)
//FieldHTTPTimeReadonly is a helper type that provides type-safe access to a
//readonly Swift header whose value is a HTTP timestamp like this:
//
// Mon, 02 Jan 2006 15:04:05 GMT
//
//It cannot be directly constructed, but methods on the Headers types return
//this type. For example:
//
// //suppose you have:
// hdr, err := obj.Headers()
//
// //you could do this:
// time, err := time.Parse(time.RFC1123, hdr.Get("Last-Modified"))
//
// //or you can just:
// time := hdr.UpdatedAt().Get()
//
//Don't worry about the missing `err` in the last line. When the header fails
//to parse, Object.Headers() already returns the corresponding
//MalformedHeaderError.
type FieldHTTPTimeReadonly struct {
h Headers
k string
}
//Exists checks whether there is a value for this header.
func (f FieldHTTPTimeReadonly) Exists() bool {
return f.h.Get(f.k) != ""
}
//Get returns the value for this header, or the zero value if there is no value
//(or if it is not a valid timestamp).
func (f FieldHTTPTimeReadonly) Get() time.Time {
t, err := http.ParseTime(f.h.Get(f.k))
if err != nil {
return time.Time{}
}
return t
}
func (f FieldHTTPTimeReadonly) validate() error {
val := f.h.Get(f.k)
if val == "" {
return nil
}
_, err := http.ParseTime(val)
if err == nil {
return nil
}
return MalformedHeaderError{f.k, err}
}
////////////////////////////////////////////////////////////////////////////////
//FieldUnixTime is a helper type that provides type-safe access to a Swift
//header whose value is a UNIX timestamp. It cannot be directly constructed,
//but methods on the Headers types return this type. For example:
//
// //suppose you have:
// hdr, err := obj.Headers()
//
// //you could do all this:
// sec, err := strconv.ParseFloat(hdr.Get("X-Delete-At"), 64)
// time := time.Unix(0, int64(1e9 * sec))
//
// //or you can just:
// time := hdr.ExpiresAt().Get()
//
//Don't worry about the missing `err` in the last line. When the header fails
//to parse, Object.Headers() already returns the corresponding
//MalformedHeaderError.
type FieldUnixTime struct {
h Headers
k string
}
//Exists checks whether there is a value for this header.
func (f FieldUnixTime) Exists() bool {
return f.h.Get(f.k) != ""
}
//Get returns the value for this header, or the zero value if there is no value
//(or if it is not a valid timestamp).
func (f FieldUnixTime) Get() time.Time {
v, err := strconv.ParseFloat(f.h.Get(f.k), 64)
if err != nil {
return time.Time{}
}
return time.Unix(0, int64(1e9*v))
}
//Set writes a new value for this header into the corresponding headers
//instance.
func (f FieldUnixTime) Set(value time.Time) {
f.h.Set(f.k, strconv.FormatUint(uint64(value.UnixNano())/1e9, 10))
}
//Del removes this key from the original headers instance, so that the key will
//remain unchanged on the server during Update().
func (f FieldUnixTime) Del() {
f.h.Del(f.k)
}
//Clear sets this key to an empty string in the original headers instance, so
//that the key will be removed on the server during Update().
func (f FieldUnixTime) Clear() {
f.h.Clear(f.k)
}
func (f FieldUnixTime) validate() error {
val := f.h.Get(f.k)
if val == "" {
return nil
}
_, err := strconv.ParseFloat(val, 64)
if err == nil {
return nil
}
return MalformedHeaderError{f.k, err}
}
////////////////////////////////////////////////////////////////////////////////
//FieldUnixTimeReadonly is a readonly variant of FieldUnixTime. It is used for
//fields that cannot be set by the client.
type FieldUnixTimeReadonly struct {
h Headers
k string
}
//Exists checks whether there is a value for this header.
func (f FieldUnixTimeReadonly) Exists() bool {
return f.h.Get(f.k) != ""
}
//Get returns the value for this header, or the zero value if there is no value
//(or if it is not a valid timestamp).
func (f FieldUnixTimeReadonly) Get() time.Time {
return FieldUnixTime{f.h, f.k}.Get()
}
func (f FieldUnixTimeReadonly) validate() error {
return FieldUnixTime{f.h, f.k}.validate()
}