Revert "avformat/hls: Check local file extensions"

Requested-by: Paul B Mahol <onemda@gmail.com>
This reverts commit caf7d6178a.

libavformat/hls.c

@@ -204,7 +204,6 @@ typedef struct HLSContext {
     char *http_proxy;                    ///< holds the address of the HTTP proxy server
     AVDictionary *avio_opts;
     int strict_std_compliance;
-    char *allowed_extensions;
 } HLSContext;
 
 static int read_chomp_line(AVIOContext *s, char *buf, int maxlen)
@@ -619,19 +618,8 @@ static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
         return AVERROR_INVALIDDATA;
 
     // only http(s) & file are allowed
-    if (av_strstart(proto_name, "file", NULL)) {
-        if (strcmp(c->allowed_extensions, "ALL") && !av_match_ext(url, c->allowed_extensions)) {
-            av_log(s, AV_LOG_ERROR,
-                "Filename extension of \'%s\' is not a common multimedia extension, blocked for security reasons.\n"
-                "If you wish to override this adjust allowed_extensions, you can set it to \'ALL\' to allow all\n",
-                url);
-            return AVERROR_INVALIDDATA;
-        }
-    } else if (av_strstart(proto_name, "http", NULL)) {
-        ;
-    } else
+    if (!av_strstart(proto_name, "http", NULL) && !av_strstart(proto_name, "file", NULL))
         return AVERROR_INVALIDDATA;
-
     if (!strncmp(proto_name, url, strlen(proto_name)) && url[strlen(proto_name)] == ':')
         ;
     else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, strlen(proto_name)) && url[7 + strlen(proto_name)] == ':')
@@ -2146,10 +2134,6 @@ static int hls_probe(AVProbeData *p)
 static const AVOption hls_options[] = {
     {"live_start_index", "segment index to start live streams at (negative values are from the end)",
         OFFSET(live_start_index), AV_OPT_TYPE_INT, {.i64 = -3}, INT_MIN, INT_MAX, FLAGS},
-    {"allowed_extensions", "List of file extensions that hls is allowed to access",
-        OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
-        {.str = "3gp,aac,avi,flac,mkv,m3u8,m4a,m4s,m4v,mpg,mov,mp2,mp3,mp4,mpeg,mpegts,ogg,ogv,oga,ts,vob,wav"},
-        INT_MIN, INT_MAX, FLAGS},
     {NULL}
 };