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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 headers
import (
"math"
"strconv"
"time"
)
//UnixTimeReadonly 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 some subtypes of schwift.Headers have fields of this type. For example:
//
// var hdr AccountHeaders
// //hdr.Timestamp is a headers.UnixTimeReadonly instance
// hdr.Timestamp.Get() //returns a time.Time
// hdr.Get("X-Timestamp") //returns a string containing a UNIX timestamp
// //refering to the same point in time
type UnixTimeReadonly struct {
Base
}
//Exists checks whether there is a value for this header.
func (f UnixTimeReadonly) 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 UnixTimeReadonly) Get() time.Time {
v, err := strconv.ParseFloat(f.H.Get(f.K), 64)
if err != nil {
return time.Time{}
}
seconds := math.Floor(v)
return time.Unix(
int64(seconds),
int64(1e9*(v-seconds)),
)
}
//Validate is only used internally, but needs to be exported to cross package
//boundaries.
func (f UnixTimeReadonly) 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}
}
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