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//
// rhimportd
//
// The Radio Helsinki Rivendell Import Daemon
//
//
// Copyright (C) 2015 Christian Pointner <equinox@helsinki.at>
//
// This file is part of rhimportd.
//
// rhimportd is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// rhimportd is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with rhimportd. If not, see <http://www.gnu.org/licenses/>.
//
package rhimport
import (
"fmt"
"github.com/golang-basic/go-curl"
"io/ioutil"
"mime"
"net/url"
"os"
"path"
"strings"
)
type FetcherCurlCBData struct {
basepath string
filename string
remotename string
*os.File
}
func (self *FetcherCurlCBData) Cleanup() {
if self.File != nil {
self.File.Close()
}
}
func curlHeaderCallback(ptr []byte, userdata interface{}) bool {
hdr := fmt.Sprintf("%s", ptr)
data := userdata.(*FetcherCurlCBData)
if strings.HasPrefix(hdr, "Content-Disposition:") {
if mediatype, params, err := mime.ParseMediaType(strings.TrimPrefix(hdr, "Content-Disposition:")); err == nil {
if mediatype == "attachment" {
data.filename = data.basepath + "/" + params["filename"]
}
}
}
return true
}
func curlWriteCallback(ptr []byte, userdata interface{}) bool {
data := userdata.(*FetcherCurlCBData)
if data.File == nil {
if data.filename == "" {
data.filename = data.basepath + "/" + data.remotename
}
fp, err := os.OpenFile(data.filename, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0600)
if err != nil {
rhl.Printf("Unable to create file %s: %s", data.filename, err)
return false
}
data.File = fp
}
if _, err := data.File.Write(ptr); err != nil {
rhl.Printf("Unable to write file %s: %s", data.filename, err)
return false
}
return true
}
func FetchFileCurl(ctx *ImportContext, uri *url.URL) (err error) {
rhl.Printf("curl-based fetcher called for '%s'", ctx.SourceUri)
easy := curl.EasyInit()
if easy != nil {
defer easy.Cleanup()
easy.Setopt(curl.OPT_FOLLOWLOCATION, true)
easy.Setopt(curl.OPT_URL, ctx.SourceUri)
cbdata := &FetcherCurlCBData{remotename: path.Base(uri.Path)}
defer cbdata.Cleanup()
if cbdata.basepath, err = ioutil.TempDir(ctx.Config.TempDir, "rhimportd-"); err != nil {
return
}
easy.Setopt(curl.OPT_HEADERFUNCTION, curlHeaderCallback)
easy.Setopt(curl.OPT_HEADERDATA, cbdata)
easy.Setopt(curl.OPT_WRITEFUNCTION, curlWriteCallback)
easy.Setopt(curl.OPT_WRITEDATA, cbdata)
easy.Setopt(curl.OPT_NOPROGRESS, false)
easy.Setopt(curl.OPT_PROGRESSFUNCTION, func(dltotal, dlnow, ultotal, ulnow float64, userdata interface{}) bool {
ctx := userdata.(*ImportContext)
if ctx.ProgressCallBack != nil {
ctx.ProgressCallBack(1, "downloading", dlnow/dltotal, ctx.ProgressCallBackData)
}
return true
})
easy.Setopt(curl.OPT_PROGRESSDATA, ctx)
if err = easy.Perform(); err != nil {
return
}
ctx.SourceFile = cbdata.filename
ctx.DeleteSourceFile = true
ctx.DeleteSourceDir = true
} else {
err = fmt.Errorf("Error initializing libcurl")
}
return
}
// TODO: check path to import from -> don't touch problematic files like /etc/shadow...
// the daemon shouldn't be running as a user who can do any harm anyway
// still: let's make a special configurable directory the local:/// dir
// and only allow absolute paths here which will be based on the
// 'local' directory
func FetchFileLocal(ctx *ImportContext, uri *url.URL) (err error) {
rhl.Printf("Local fetcher called for '%s'", ctx.SourceUri)
if ctx.ProgressCallBack != nil {
ctx.ProgressCallBack(1, "fetching", 1.0, ctx.ProgressCallBackData)
}
ctx.SourceFile = uri.Path
ctx.DeleteSourceFile = false
ctx.DeleteSourceDir = false
return
}
type FetchFunc func(*ImportContext, *url.URL) (err error)
// TODO: implement fetchers for:
// archiv://
// public://
// home:// ?????
var (
fetchers = map[string]FetchFunc{
"local": FetchFileLocal,
}
curl_protos = map[string]bool{
"http": false, "https": false,
"ftp": false, "ftps": false,
}
)
func fetcher_init() {
info := curl.VersionInfo(curl.VERSION_FIRST)
protos := info.Protocols
for _, proto := range protos {
if _, ok := curl_protos[proto]; ok {
rhdl.Printf("curl: enabling protocol %s", proto)
fetchers[proto] = FetchFileCurl
curl_protos[proto] = true
} else {
rhdl.Printf("curl: ignoring protocol %s", proto)
}
}
for proto, enabled := range curl_protos {
if !enabled {
rhl.Printf("curl: protocol %s is disabled because the installed library version doesn't support it!", proto)
}
}
}
// TODO: make sure a (partially) fetched file get's deleted on error
func FetchFile(ctx *ImportContext) (err error) {
var uri *url.URL
if uri, err = url.Parse(ctx.SourceUri); err != nil {
return
}
if fetcher, ok := fetchers[uri.Scheme]; ok {
err = fetcher(ctx, uri)
} else {
err = fmt.Errorf("No fetcher for uri scheme '%s' found.", uri.Scheme)
}
return
}
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