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walk-manifest.js
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walk-manifest.js
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var m3u8 = require('m3u8-parser');
var syncRequest = require('sync-request');
var url = require('url');
var path = require('path');
var fs = require('fs');
var debug = require('debug')('hls');
var joinURI = function(absolute, relative) {
var parse = url.parse(absolute);
parse.pathname = path.join(parse.pathname, relative);
return url.format(parse);
};
var isAbsolute = function(uri) {
var parsed = url.parse(uri);
if (parsed.protocol) {
return true;
}
return false;
};
var mediaGroupPlaylists = function(mediaGroups) {
var playlists = [];
['AUDIO', 'VIDEO', 'CLOSED-CAPTIONS', 'SUBTITLES'].forEach(function(type) {
var mediaGroupType = mediaGroups[type];
if (mediaGroupType && !Object.keys(mediaGroupType).length) {
return;
}
for (var group in mediaGroupType) {
for (var item in mediaGroupType[group]) {
var props = mediaGroupType[group][item];
playlists.push(props);
}
}
});
debug('mediaGroupPlaylists:');
debug(playlists);
return playlists;
};
var parseManifest = function(content) {
var parser = new m3u8.Parser();
parser.push(content);
parser.end();
debug('parsed manifest:');
debug(parser.manifest);
return parser.manifest;
};
var parseKey = function(basedir, decrypt, resources, manifest, parent) {
if (!manifest.parsed.segments[0] || !manifest.parsed.segments[0].key) {
return {};
}
var key = manifest.parsed.segments[0].key;
var keyUri = key.uri;
if (!isAbsolute(keyUri)) {
keyUri = joinURI(path.dirname(manifest.uri), keyUri);
}
// if we are not decrypting then we just download the key
if (!decrypt) {
// put keys in parent-dir/key-name.key
key.file = basedir;
if (parent) {
key.file = path.dirname(parent.file);
}
key.file = path.join(key.file, path.basename(key.uri));
manifest.content = new Buffer(manifest.content.toString().replace(
key.uri,
path.relative(path.dirname(manifest.file), key.file)
));
key.uri = keyUri;
resources.push(key);
return key;
}
// get the aes key
var keyContent = syncRequest('GET', keyUri).getBody();
key.bytes = new Uint32Array([
keyContent.readUInt32BE(0),
keyContent.readUInt32BE(4),
keyContent.readUInt32BE(8),
keyContent.readUInt32BE(12)
]);
// remove the key from the manifest
manifest.content = new Buffer(manifest.content.toString().replace(
new RegExp('.*' + key.uri + '.*'),
''
));
return key;
};
var walkPlaylist = function(decrypt, basedir, uri, parent, manifestIndex, playlistFilter) {
var resources = [];
var manifest = {};
manifest.uri = uri;
manifest.file = path.join(basedir, path.basename(uri));
resources.push(manifest);
// if we are not the master playlist
if (parent) {
manifest.file = path.join(
path.dirname(parent.file),
'manifest' + manifestIndex,
path.basename(manifest.file)
);
// get the real uri of this playlist
if (!isAbsolute(manifest.uri)) {
manifest.uri = joinURI(path.dirname(parent.uri), manifest.uri);
}
// replace original uri in file with new file path
parent.content = new Buffer(parent.content.toString().replace(uri, path.relative(path.dirname(parent.file), manifest.file)));
}
manifest.content = syncRequest('GET', manifest.uri).getBody();
debug('manifest.content');
debug(manifest.content);
manifest.parsed = parseManifest(manifest.content);
manifest.parsed.segments = manifest.parsed.segments || [];
manifest.parsed.playlists = manifest.parsed.playlists || [];
manifest.parsed.mediaGroups = manifest.parsed.mediaGroups || {};
var playlists = manifest.parsed.playlists.concat(mediaGroupPlaylists(manifest.parsed.mediaGroups));
var key = parseKey(basedir, decrypt, resources, manifest, parent);
// SEGMENTS
manifest.parsed.segments.forEach(function(s, i) {
if (!s.uri) {
return;
}
// put segments in manifest-name/segment-name.ts
s.file = path.join(path.dirname(manifest.file), path.basename(s.uri));
if (!isAbsolute(s.uri)) {
s.uri = joinURI(path.dirname(manifest.uri), s.uri);
}
if (key) {
s.key = key;
s.key.iv = s.key.iv || new Uint32Array([0, 0, 0, manifest.parsed.mediaSequence, i]);
}
manifest.content = new Buffer(manifest.content.toString().replace(s.uri, path.basename(s.uri)));
resources.push(s);
});
// Pick a SUB playlist:
playlists = playlists.filter(p => p.uri);
var filterFunc = playlistFilter || (function(allPlaylists) {
return [].concat(allPlaylists[0] || []);
});
playlists = filterFunc(playlists);
// if (process.env.PLAYLIST_NAME) {
// // Presuming the playlist with this name exists
// playlists = playlists.filter((p) => {
// return p.attributes.NAME === process.env.PLAYLIST_NAME;
// });
// } else {
// playlists = [].concat(playlists[0] || []);
// }
debug('playlists:');
debug(playlists);
// SUB Playlists
playlists.forEach(function(p, z) {
if (!p.uri) {
return;
}
resources = resources.concat(walkPlaylist(decrypt, basedir, p.uri, manifest, z, playlistFilter));
});
return resources;
};
module.exports = walkPlaylist;