From 1a409362450ea903019005bc48145be1da14848d Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Thu, 14 Jul 2016 23:18:15 +0200
Subject: added support for youtube-dl


diff --git a/rhimport/fetcher.go b/rhimport/fetcher.go
index 469d36b..3933105 100644
--- a/rhimport/fetcher.go
+++ b/rhimport/fetcher.go
@@ -25,6 +25,7 @@
 package rhimport
 
 import (
+	"bytes"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -32,6 +33,7 @@ import (
 	"net/http"
 	"net/url"
 	"os"
+	"os/exec"
 	"os/user"
 	"path"
 	"path/filepath"
@@ -134,9 +136,51 @@ func curlProgressCallback(dltotal, dlnow, ultotal, ulnow float64, userdata inter
 	return true
 }
 
+func checkYoutubeDL(ctx *Context, res *Result, uri *url.URL) *YoutubeDLInfo {
+	cmd := exec.Command("youtube-dl", "--no-playlist", "-f", "bestaudio/best", "--prefer-free-formats", "-J", ctx.SourceUri)
+	var stderr, stdout bytes.Buffer
+	cmd.Stdout = &stdout
+	cmd.Stderr = &stderr
+
+	done := make(chan *YoutubeDLInfo)
+	go func() {
+		defer func() {
+			done <- nil
+		}()
+		if err := cmd.Run(); err != nil {
+			rhdl.Printf("youtube-dl: %v, stderr: %s", err, strings.TrimSpace(stderr.String()))
+			return
+		}
+		info, err := NewYoutubeDLInfoFromJSON(&stdout)
+		if err != nil {
+			rhdl.Printf("youtube-dl: %v, stderr: %s", err, strings.TrimSpace(stderr.String()))
+			return
+		}
+		rhl.Printf("youtube-dl: extractor: %s -> %s", info.Extractor, info.URL)
+		ctx.SourceUri = info.URL
+		done <- info
+	}()
+
+	select {
+	case info := <-done:
+		return info
+	case <-ctx.Cancel:
+		cmd.Process.Kill()
+		res.ResponseCode = http.StatusNoContent
+		res.ErrorString = "canceled"
+		return nil
+	}
+}
+
 func fetchFileCurl(ctx *Context, res *Result, uri *url.URL) (err error) {
 	rhl.Printf("curl-based fetcher called for '%s'", ctx.SourceUri)
 
+	info := checkYoutubeDL(ctx, res, uri)
+	if res.ResponseCode == http.StatusNoContent {
+		rhl.Printf("download of '%s' got canceled", ctx.SourceUri)
+		return nil
+	}
+
 	easy := curl.EasyInit()
 	if easy == nil {
 		err = fmt.Errorf("Error initializing libcurl")
@@ -148,10 +192,28 @@ func fetchFileCurl(ctx *Context, res *Result, uri *url.URL) (err error) {
 	easy.Setopt(curl.OPT_URL, ctx.SourceUri)
 	easy.Setopt(curl.OPT_USERAGENT, "Radio Helsinki Import")
 
+	if info != nil && (info.Protocol == "http" || info.Protocol == "https") {
+		if len(info.HTTPHeaders) > 0 {
+			var h []string
+			for key, value := range info.HTTPHeaders {
+				h = append(h, key+": "+value)
+			}
+			easy.Setopt(curl.OPT_HTTPHEADER, h)
+			rhdl.Printf("added HTTP header: %q", h)
+		}
+	}
+
 	cbdata := &FetcherCurlCBData{ctx: ctx, res: res, remotename: path.Base(uri.Path)}
 	if cbdata.basepath, err = ioutil.TempDir(ctx.conf.TempDir, "rhimportd-"); err != nil {
 		return
 	}
+	if info != nil {
+		if info.Title == "" {
+			cbdata.remotename = info.ID + "." + info.Ext
+		} else {
+			cbdata.remotename = info.Title + "." + info.Ext
+		}
+	}
 
 	easy.Setopt(curl.OPT_HEADERFUNCTION, curlHeaderCallback)
 	easy.Setopt(curl.OPT_HEADERDATA, cbdata)
diff --git a/rhimport/youtubedl_responses.go b/rhimport/youtubedl_responses.go
new file mode 100644
index 0000000..1a8c0ca
--- /dev/null
+++ b/rhimport/youtubedl_responses.go
@@ -0,0 +1,51 @@
+//
+//  rhimportd
+//
+//  The Radio Helsinki Rivendell Import Daemon
+//
+//
+//  Copyright (C) 2015-2016 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 (
+	"encoding/json"
+	"fmt"
+	"io"
+)
+
+type YoutubeDLInfo struct {
+	ID          string            `json:"id"`
+	Title       string            `json:"title"`
+	URL         string            `json:"url"`
+	Extractor   string            `json:"extractor"`
+	Ext         string            `json:"ext"`
+	Protocol    string            `json:"protocol"`
+	HTTPHeaders map[string]string `json:"http_headers"`
+}
+
+func NewYoutubeDLInfoFromJSON(data io.Reader) (res *YoutubeDLInfo, err error) {
+	decoder := json.NewDecoder(data)
+	res = &YoutubeDLInfo{}
+	if jsonerr := decoder.Decode(res); jsonerr != nil {
+		err = fmt.Errorf("Error parsing JSON response: %s", jsonerr)
+		return
+	}
+	return
+}
-- 
cgit v0.10.2