invidious: rewrite

- Use API cleverly
- Allow specifying a provider different than invidio.us
- Use torsocks by default

bin/invidious.sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 # invidious
 # Written in 2019 by Leslie
-# Modified in 2019 by Lucas
+# Modified in 2019-2020 by Lucas
 # CC0 1.0 Universal/Public domain - No rights reserved
 #
 # To the extent possible under law, the author(s) have dedicated all
@@ -13,7 +13,7 @@
 
 usage()
 {
-	printf "Usage: %s url\n" "${0##*/}" >&2
+	printf "Usage: [-T] %s url\n" "${0##*/}" >&2
 	exit 1
 }
 
@@ -23,33 +23,45 @@ err()
 	exit 1
 }
 
-[ $# -eq 1 ] || usage
+api()
+{
+	printf "https://%s%s\n" "$INVIDIOUS" "$*"
+}
 
-case $1 in
-"https://invidio.us/watch?v="*)
+: ${INVIDIOUS:=invidious.snopyta.org}
+
+torsocks=torsocks
+while getopts T flag; do
+	case $flag in
+	T)	torsocks=
 		;;
-*)	err "Not an invidio.us url."
+	*)	usage
 		;;
 	esac
+done
+shift $((OPTIND - 1))
+[ $# -eq 1 ] || usage
 
-video_id=
-for param in $(printf "%s\n" "${1##*"?"}" | tr "&" "\n"); do
-	k=${param%%=*}
-	[ "$k" = v ] || continue
+# XXX check URL for known sites
+url=$1
 
-	v=${param#*=}
-	if [ ${#v} -ne 11 ]; then
-		printf  "%s: \"%s\": not a video ID." "${0##*/}" "$v" >&2
-		continue
-	fi
-	video_id=$v
-	break
+oldIFS=$IFS
+IFS="&"
+set -- ${url##*"?"}
+IFS=$oldIFS
+
+id=
+for param; do
+	case $param in
+	v=*)	id=${param#v=}
+		[ ${#id} -eq 11 ] || err "invalid video ID"
+		;;
+	esac
 done
 
-[ -n "$video_id" ] || err "no video ID in URL."
+[ -n "$id" ] || err "no video ID in URL"
 
-dl_option=$(ftp -o - "$1" 2>/dev/null | grep -F "<option value='{" |
-    head -n 1 | cut -d "\"" -f 8)
-
-printf "https://invidio.us/latest_version?id=%s&itag=%s\n" \
-    "$video_id" "$dl_option"
+# XXX choose in some clever way
+itag=$(torsocks ftp -MVo - "$(api "/api/v1/videos/$id")" |
+    jq -r ".formatStreams[].itag" | head -n 1)
+api "/latest_version?id=$id&itag=$itag"