/
utils.go
140 lines (127 loc) · 3.7 KB
/
utils.go
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// Copyright 2021 The ZKits Project Authors.
//
// 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 internal
import (
"fmt"
"io"
"mime/multipart"
"os"
"path/filepath"
"reflect"
"strconv"
)
// ToString converts the given parameter to a string.
func ToString(value interface{}) string {
if value == nil {
return ""
}
switch v := value.(type) {
case string:
return v
case int:
return strconv.Itoa(v)
case int8:
return strconv.FormatInt(int64(v), 10)
case int16:
return strconv.FormatInt(int64(v), 10)
case int32:
return strconv.FormatInt(int64(v), 10)
case int64:
return strconv.FormatInt(v, 10)
case uint:
return strconv.FormatUint(uint64(v), 10)
case uint8:
return strconv.FormatUint(uint64(v), 10)
case uint16:
return strconv.FormatUint(uint64(v), 10)
case uint32:
return strconv.FormatUint(uint64(v), 10)
case uint64:
return strconv.FormatUint(v, 10)
case float64:
return strconv.FormatFloat(v, 'g', -1, 64)
case float32:
return strconv.FormatFloat(float64(v), 'g', -1, 32)
case []byte:
return string(v)
case bool:
return strconv.FormatBool(v)
case fmt.Stringer:
return v.String()
case error:
return v.Error()
}
rv := reflect.ValueOf(value)
for k := rv.Kind(); k == reflect.Ptr || k == reflect.Interface; k = rv.Kind() {
rv = rv.Elem()
}
switch rv.Kind() {
case reflect.String:
return rv.String()
case reflect.Int64, reflect.Int, reflect.Int32, reflect.Int16, reflect.Int8:
return strconv.FormatInt(rv.Int(), 10)
case reflect.Uint64, reflect.Uint, reflect.Uint32, reflect.Uint16, reflect.Uint8:
return strconv.FormatUint(rv.Uint(), 10)
case reflect.Bool:
return strconv.FormatBool(rv.Bool())
case reflect.Float64:
return strconv.FormatFloat(rv.Float(), 'g', -1, 64)
case reflect.Float32:
return strconv.FormatFloat(rv.Float(), 'g', -1, 32)
}
return fmt.Sprint(value)
}
// ForceClose force close the given io.Closer ignore error.
func ForceClose(c io.Closer) {
_ = c.Close()
}
// ShouldBeRegularFile determines whether the given target is a regular file.
func ShouldBeRegularFile(info os.FileInfo, err error) error {
if err != nil {
return err
}
if !info.Mode().IsRegular() {
return fmt.Errorf("target %s is not a regular file", info.Name())
}
return nil
}
// WriteFormDataFromReader writes the contents of a given io.Reader to upload writer.
func WriteFormDataFromReader(key, name string, w *multipart.Writer, src io.Reader) error {
fw, err := w.CreateFormFile(key, name)
if err != nil {
return err
}
// Do we need to disallow uploading empty target?
// Of course, it's allowed now!
_, err = io.Copy(fw, src)
return err
}
// WriteFormDataFromFilePath writes the contents of a given file to upload writer.
func WriteFormDataFromFilePath(key, p string, w *multipart.Writer) error {
f, err := os.Open(p)
if err != nil {
return err
}
defer ForceClose(f)
return WriteFormDataFromReader(key, filepath.Base(f.Name()), w, f)
}
// WriteFormDataFromFileHeader writes the downstream uploaded file to upload writer.
func WriteFormDataFromFileHeader(key string, p *multipart.FileHeader, w *multipart.Writer) error {
f, err := p.Open()
if err != nil {
return err
}
defer ForceClose(f)
return WriteFormDataFromReader(key, filepath.Base(p.Filename), w, f)
}