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utils.go
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/
utils.go
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package pkg
import (
"io"
"mime"
"net/http"
"os"
"path/filepath"
"strings"
)
// DownloadFile will download from a given url to a file. It will
// write as it downloads (useful for large files).
func (r *Renderer) download(pth string, url string) (ext string, _ error) {
if _, err := os.Stat(pth); err == nil {
// exists, does not get it
return
} else if filepath.Ext(pth) == "" {
// auto detect ext
name := filepath.Base(pth)
var exists bool
err = func() error {
f, err := os.Open(filepath.Dir(pth))
if err != nil {
return err
}
defer f.Close()
dirs, err := f.ReadDir(-1)
if err != nil {
return err
}
for _, dir := range dirs {
dname := dir.Name()
if strings.HasPrefix(dname, name+".") {
ext = filepath.Ext(dname)
if name+ext == dname {
exists = true
return nil
}
}
}
return nil
}()
if err != nil {
return "", err
}
if exists {
return
}
}
// Get the data
resp, err := http.Get(url)
if err != nil {
return "", err
}
defer resp.Body.Close()
if filepath.Ext(pth) == "" {
exts, err := mime.ExtensionsByType(resp.Header.Get("Content-Type"))
if err != nil {
return "", err
}
if len(exts) > 0 {
ext = exts[0]
pth += ext
}
}
if r.Downloaded != nil {
r.Downloaded(pth, url)
}
// Create the file
out, err := os.Create(pth)
if err != nil {
return "", err
}
defer out.Close()
// Write the body to file
_, err = io.Copy(out, resp.Body)
return ext, err
}