/usr/share/javascript/sdp-transform/writer.js is in libjs-sdp-transform 1.4.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 | var grammar = require('./grammar');
// customized util.format - discards excess arguments and can void middle ones
var formatRegExp = /%[sdv%]/g;
var format = function (formatStr) {
var i = 1;
var args = arguments;
var len = args.length;
return formatStr.replace(formatRegExp, function (x) {
if (i >= len) {
return x; // missing argument
}
var arg = args[i];
i += 1;
switch (x) {
case '%%':
return '%';
case '%s':
return String(arg);
case '%d':
return Number(arg);
case '%v':
return '';
}
});
// NB: we discard excess arguments - they are typically undefined from makeLine
};
var makeLine = function (type, obj, location) {
var str = obj.format instanceof Function ?
(obj.format(obj.push ? location : location[obj.name])) :
obj.format;
var args = [type + '=' + str];
if (obj.names) {
for (var i = 0; i < obj.names.length; i += 1) {
var n = obj.names[i];
if (obj.name) {
args.push(location[obj.name][n]);
}
else { // for mLine and push attributes
args.push(location[obj.names[i]]);
}
}
}
else {
args.push(location[obj.name]);
}
return format.apply(null, args);
};
// RFC specified order
// TODO: extend this with all the rest
var defaultOuterOrder = [
'v', 'o', 's', 'i',
'u', 'e', 'p', 'c',
'b', 't', 'r', 'z', 'a'
];
var defaultInnerOrder = ['i', 'c', 'b', 'a'];
module.exports = function (session, opts) {
opts = opts || {};
// ensure certain properties exist
if (session.version == null) {
session.version = 0; // "v=0" must be there (only defined version atm)
}
if (session.name == null) {
session.name = " "; // "s= " must be there if no meaningful name set
}
session.media.forEach(function (mLine) {
if (mLine.payloads == null) {
mLine.payloads = "";
}
});
var outerOrder = opts.outerOrder || defaultOuterOrder;
var innerOrder = opts.innerOrder || defaultInnerOrder;
var sdp = [];
// loop through outerOrder for matching properties on session
outerOrder.forEach(function (type) {
grammar[type].forEach(function (obj) {
if (obj.name in session && session[obj.name] != null) {
sdp.push(makeLine(type, obj, session));
}
else if (obj.push in session && session[obj.push] != null) {
session[obj.push].forEach(function (el) {
sdp.push(makeLine(type, obj, el));
});
}
});
});
// then for each media line, follow the innerOrder
session.media.forEach(function (mLine) {
sdp.push(makeLine('m', grammar.m[0], mLine));
innerOrder.forEach(function (type) {
grammar[type].forEach(function (obj) {
if (obj.name in mLine && mLine[obj.name] != null) {
sdp.push(makeLine(type, obj, mLine));
}
else if (obj.push in mLine && mLine[obj.push] != null) {
mLine[obj.push].forEach(function (el) {
sdp.push(makeLine(type, obj, el));
});
}
});
});
});
return sdp.join('\r\n') + '\r\n';
};
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