82 lines
1.5 KiB
Go
82 lines
1.5 KiB
Go
package downloader
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"strings"
|
|
|
|
req "github.com/levigross/grequests"
|
|
"github.com/schollz/progressbar/v3"
|
|
)
|
|
|
|
type Context struct {
|
|
Filename string
|
|
Link string
|
|
}
|
|
|
|
func NewContext(filename, link string) *Context {
|
|
return &Context{
|
|
Filename: filename,
|
|
Link: link,
|
|
}
|
|
}
|
|
|
|
func (c *Context) Download() error {
|
|
resp, err := req.Head(c.Link, nil)
|
|
if err != nil {
|
|
if strings.Contains(err.Error(), "no such host") {
|
|
return fmt.Errorf("invalid url")
|
|
}
|
|
if strings.Contains(err.Error(), "certificate signed by unknown authority") {
|
|
return fmt.Errorf("certificate from unknown authority")
|
|
}
|
|
return err
|
|
}
|
|
defer resp.Close()
|
|
if resp.StatusCode == 404 {
|
|
return fmt.Errorf("invalid url")
|
|
}
|
|
if resp.StatusCode == 401 {
|
|
return fmt.Errorf("restricted access (credentials required)")
|
|
}
|
|
if resp.StatusCode != 200 {
|
|
return fmt.Errorf(resp.RawResponse.Status)
|
|
}
|
|
resp.Close()
|
|
|
|
resp, err = req.Get(c.Link, nil)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
var filesize int64
|
|
if resp.RawResponse.ContentLength > -1 {
|
|
filesize = resp.RawResponse.ContentLength
|
|
}
|
|
|
|
destFile, err := os.OpenFile(c.Filename, os.O_CREATE|os.O_WRONLY, 0644)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer destFile.Close()
|
|
|
|
bar := progressbar.DefaultBytes(
|
|
filesize,
|
|
"downloading",
|
|
)
|
|
|
|
_, err = io.Copy(io.MultiWriter(destFile, bar), resp.RawResponse.Body)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (c *Context) FileExists() bool {
|
|
_, err := os.Stat(c.Filename)
|
|
return !errors.Is(err, os.ErrNotExist)
|
|
}
|