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utils.go
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utils.go
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package idm
import (
"net/http"
"net/url"
"os"
"strings"
"time"
)
// Validate a url
func isUrl(str string) bool {
u, err := url.Parse(str)
// IDM accepts urls without schema
return err == nil && u.Host != ""
}
// Build the final args
func (d *Download) buildArgs() []string {
args := []string{"/d", d.URL}
if d.SilentMode {
args = append(args, "/n")
}
if d.Quit {
args = append(args, "/q")
}
if d.HangUp {
args = append(args, "/h")
}
if d.Path != "" {
args = append(args, "/p", d.Path)
}
if d.FileName != "" {
args = append(args, "/f", d.FileName)
}
return args
}
// Get the header for url
// Used to extract file name
func (d *Download) getAndSetFileHeader() error {
resp, err := http.Head(d.URL)
if err != nil {
return &URLHeaderError{err: err}
}
if resp.StatusCode != http.StatusOK {
return URLStatusCodeError
}
d.URLHeader = resp
return nil
}
// Get the file size from url header
func (d *Download) setFileName() error {
var err error
if d.URLHeader == nil {
err = d.getAndSetFileHeader()
if err != nil {
return err
}
}
// file name might be present in Content-Disposition header
// e.g: attachment; filename=file.zip
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Disposition
cd := d.URLHeader.Header.Get("Content-Disposition")
if cd == "" {
return FileNameHeaderError
}
sp := strings.Split(cd, " ")
for _, s := range sp {
if strings.Contains(s, "filename=") {
d.FileName = strings.Split(s, "=")[1]
return nil
}
}
return FileNameHeaderError
}
// Wait's until the file is appeared in the given path or it times out
func waitForFileToAppear(path string, timeout time.Duration) error {
tick := time.Tick(timeout)
for {
select {
case <-tick:
return WaitForDownloadTimeOutError
// Wait 1 sec before checking again
case <-time.After(time.Second * 1):
if _, err := os.Stat(path); err == nil {
return nil
}
}
}
}