svrjs-nextjs-website/pages/docs/mods/mod-development-legacy.md

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---
title: Mod development (.tar.gz mods)
---
# Mod development (_.tar.gz_ mods)
Mods in SVR.JS have two methods:
- _callback_ - Invoked on non-CONNECT requests (includes proxy requests using GET or POST methods). Parameters (must be in this particular order, argument names given to match SVR.JS API documentation):
- _req_
- _res_
- _serverconsole_
- _responseEnd_
- _href_
- _ext_
- _uobject_
- _search_
- _defaultpage_
- _users_
- _page404_
- _head_
- _foot_
- _fd_
- _elseCallback_
- _configJSON_
- _callServerError_
- _getCustomHeaders_
- _origHref_
- _redirect_
- _parsePostData_
- _authUser_
**This method is required** (if it is not present, SVR.JS will simply return 500 Internal Server Error on all requests with error message in error stack similar to "_TypeError: modO.callback is not a function_").
- _proxyCallback_ - Invoked on CONNECT requests (used for proxying). Parameters (must be in this particular order, argument names given to match SVR.JS API documentation):
- _req_
- _socket_
- _head_
- _configJSON_
- _serverconsole_
- _elseCallback_
Required in order for function returned from _callback_ method to be invoked for request URLs beginning with "_http://_" or with "_https://_" (proxy through GET or POST method, non-proxy requests have request URLs beginning with "_/_"). **You should implement a proxy URL check in _callback_ method, if you're going to use _proxyCallback_ and _callback_ methods at once, or else your SVR.JS mod may be vulnerable to access control bypass attacks** (SVR.JS doesn't enforce URL rewriting, custom headers and non-standard codes for proxy requests to avoid interference of its access controls with proxy mods).
These methods are defined inside _Mod.prototype_ object. Both methods return a function, which will be executed in SVR.JS.
`__dirname` and _._ in `require()` function both refer to directory, to which mod contents are extracted.
The reference to file in the SVR.JS installation directory is `__dirname + "/../../../filename"` (replace `filename` with your desired file name).
Current working directory (`process.cwd()`) is SVR.JS web root.
A typical _index.js_ file for a mod may look like this:
```js
//Requires go here
function Mod() {}
Mod.prototype.callback = function callback(
req,
res,
serverconsole,
responseEnd,
href,
ext,
uobject,
search,
defaultpage,
users,
page404,
head,
foot,
fd,
elseCallback,
configJSON,
callServerError,
getCustomHeaders,
origHref,
redirect,
parsePostData
) {
return function () {
//Mod contents go here
if (href == "/hello.svr") {
serverconsole.resmessage("Sent Hello World message!");
res.writeHead(200, "OK", {
"Content-Type": "text/plain",
});
res.end("Hello World!");
} else {
elseCallback();
}
};
};
//OPTIONAL: proxyCallback method
//Uncomment code below, if you want to use proxyCallback method.
//But then you'll need to implement proxy request URL check for callback method.
/*
Mod.prototype.proxyCallback = function proxyCallback(req, socket, head, configJSON, serverconsole, elseCallback) {
return function () {
//Just pass elseCallback
elseCallback();
}
}
*/
module.exports = Mod; //SVR.JS mod exports
```
The _mod.info_ file (in JSON format) contains metadata about the mod, such as its name and version:
```
{
"name": "The Example Mod",
"version": "0.1.0"
}
```