copious-transitions
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<pre class="prettyprint source linenums"><code>/**
* @namespace CopiousTransitions
*/
const fs = require('fs')
const crypto = require('crypto')
const clone = require('clone')
const passwordGenerator = require('generate-password');
const ShutdownManager = require('./lib/shutdown-manager')
//const shutdown_server_helper_factory = require('http-shutdown')
const UserHandling = require('./contractual/user_processing')
const MimeHandling = require('./contractual/mime_processing')
const TranstionHandling = require('./contractual/transition_processing');
const { EventEmitter } = require('events');
// https://github.com/fastify/fastify
let g_password_store = []
const PASSWORD_DEPLETION_MIN = 3
const PASSWORD_BLOCKSIZE = 100
//
const g_expected_modules = [
"custom_transitions",
"db",
"middleware",
"authorizer",
"validator",
"static_assets",
"dynamic_assets",
"expression",
"business",
"transition_engine",
"web_sockets",
"endpoint_server"
]
//
const g_hex_re = /^[0-9a-fA-F]+$/;
//
/**
*
* The class provided in this module provides the main method for the entry point to an application running
* a CopiousTransitions web server.
*
* Here is a typical application.
*
* ```
const CopiousTransitions = require('copious-transitions') // include this module
let [config,debug] = [false,false] // define the variables
config = "./user-service-myapp.conf" // set the configuration file name
if ( process.argv[2] !== undefined ) {
config = process.argv[2];
}
if ( process.argv[3] !== undefined ) { // maybe use debugging
if ( process.argv[3] === 'debug' ) {
debug = true
}
}
let transition_app = new CopiousTransitions(config,debug,__dirname) // Initialize everything according to the configuration.
// in this application the local directory of the calling module is the place to look for mod path modules to be loaded.
transition_app.on('ready',() => { // when the configuration is done the application is ready to run
transition_app.run() // run the application
})
```
*
* The constructor loads all the modules that are configured for execution.
* Take note that the module are not specified at the top of file where this class is defined.
* The modules that this process will use are required to be specified in the configuration file.
*
* The constuctor first calls `load_parameters` which can reset the module offsets as needed.
* In some cases, a module might not be listed in the configuration, for instance.
*
* The `load_parameters` call also defines a set of global variables and methods that can be used throughout the process
* as needed. A restriction of the basic module architecture is that these globals be defined here and nowhere else.
* (While there is no way to regulate the management of globals in an application, it is recommended to keep any global definitions
* in one place.)
*
* After the `load_parameters` call is performed, the required modules are loaded. Each module is responsible for returning a
* constucted object based on the classes defined with it.
*
* In the module stack, most of the salient variables that must be configured are set in the intialization methods.
* The same is true here, and the constructor defers the all the initializations to the initialization method.
* The main initialization method is asynchronous, and so this constructor parsels its call out to a thunk.
*
* The only modules that are loaded by `requires` at the top of this file are the `contractual` modules.
* The `contractual` modules are supposed to be universal enough so as to not require overrides. In some cases,
* an application might choose to replace the. Such applications can override the class provided here. The method `initlialize_contractuals`
* is set aside for the purpose of overriding these methods. However, it is recommended that the existing methods be kept in tact,
* as they define the basic structure for handling requests in applications derived from CopiousTransitions.
*
* @memberof CopiousTransitions
*/
class CopiousTransitions extends EventEmitter {
//
constructor(config,debug,caller_dir) {
super()
this.debug = debug
const conf_obj = load_parameters(config,caller_dir) // configuration parameters to select modules, etc.
this.conf_obj = conf_obj
this.port = conf_obj.port
//
this.custom_transitions = require(conf_obj.mod_path.custom_transitions)
// SPECIAL NAMED TRANSITIONS (PATHS)
this.custom_transitions.initialize(conf_obj)
// CONFIGURE
this.db = require(conf_obj.mod_path.db) // The database interface. Sets up session store, static store, and other DB pathways
this.middleware = require(conf_obj.mod_path.middleware) // This is middleware for Express applications
this.authorizer = require(conf_obj.mod_path.authorizer) // Put authorization mechanics here.
this.statics = require(conf_obj.mod_path.static_assets) // Special handling for fetching static assets.
this.dynamics = require(conf_obj.mod_path.dynamic_assets) // Program spends some time creating the asset.
this.validator = require(conf_obj.mod_path.validator) // Custom access to field specification from configuration and the application through DB or inline code
this.business = require(conf_obj.mod_path.business) // backend tasks that don't return values, but may send them out to other services.. (some procesing involved)
this.transition_engine = require(conf_obj.mod_path.transition_engine)
this.web_sockets = require(conf_obj.mod_path.web_sockets) // web sockets - serveral types of application supported -- use app chosen ws interface
this.endpoint_server = require(conf_obj.mod_path.endpoint_server) // certain applications will handle transition from the backend
//
this.app = require(conf_obj.mod_path.expression)(conf_obj,this.db); // exports a function
this.session_manager = null
//
this.max_cache_time = 3600000*2 // once every two hours
//
this.user_handler = false
this.mime_handler = false
this.transition_processing = false
//
this.caller_dir = caller_dir
//
let b = (async () => {
await this.initialize_all(conf_obj)
this.setup_paths(conf_obj)
this.emit('ready')
})
b()
}
// INITIALIZE
/**
*
* @param {object} conf_obj
*/
async initialize_all(conf_obj) {
//
this.db.initialize(conf_obj)
this.business.initialize(conf_obj,this.db)
this.transition_engine.initialize(conf_obj,this.db)
//
this.session_manager = this.authorizer.sessions(this.app,this.db,this.business,this.transition_engine) // setup session management, session, cookies, tokens, etc. Use database and Express api.
// sessions inializes the custom session manager determined in the application authorizer.
this.middleware.setup(this.app,this.db,this.session_manager) // use a module to cusomize the use of Express middleware.
this.validator.initialize(conf_obj,this.db,this.session_manager) // The validator may refer to stored items and look at other context dependent information
this.statics.initialize(this.db,conf_obj) // Static assets may be taken out of DB storage or from disk, etc.
await this.dynamics.initialize(this.db,conf_obj) // Dynamichk assets may be taken out of DB storage or from disk, etc.
this.transition_engine.install(this.statics,this.dynamics,this.session_manager)
// --- contractual logic ---
this.initlialize_contractuals()
// websocket access to contractual logic
this.web_sockets.initialize(conf_obj,this.app)
this.web_sockets.set_contractual_filters(this.transition_processing,this.user_handler,this.mime_handler)
//
this.endpoint_server.initialize(conf_obj,this.db)
this.endpoint_server.set_contractual_filters(this.transition_processing,this.user_handler,this.mime_handler)
this.endpoint_server.set_ws(this.web_sockets)
//
// transition engine access to web sockets and contractual logic
this.transition_engine.set_ws(this.web_sockets)
this.transition_engine.set_contractual_filters(this.transition_processing,this.user_handler,this.mime_handler)
//
}
/**
* Construct the contractual handlers. Simply new object instances.
* Pass in the previously allocated handlers.
*/
initlialize_contractuals() {
let use_foreign = false // conf_obj.foreign_auth.allowed (deprecated)
this.user_handler = new UserHandling(this.session_manager,this.validator,this.statics,this.dynamics,this.transition_engine,use_foreign,this.max_cache_time)
this.mime_handler = new MimeHandling(this.session_manager,this.validator,this.statics,this.dynamics,this.max_cache_time)
this.transition_processing = new TranstionHandling(this.session_manager,this.validator,this.dynamics,this.max_cache_time)
}
/**
* Set up the web api paths which will be used by the router to find the handler methods.
* The paths specified in this method are a short list of paths describing the general types of transactions
* that are needed to carry out actions for fetching something, creating something to be returned as a mime type asset,
* or for performing a state transition. Some paths are of the type that are *guarded*. Guarded paths require user identification
* via session identification and token matching, especially if there is a secondary action.
*
* Here is a list of the paths that this module defines:
*
* * /static/:asset -- previously static_mime. This just returns a static (not computed) piece of information. The app should be able to set the mime type.
* * /guarded/static/:asset -- previously keyed_mime. Same as above, but checks the session for access.
* * /guarded/dynamic/:asset -- does the same as static but calls on functions that generate assets -- could be a function service.
* * /guarded/secondary -- a handshake that may be required of some assets before delivery of the asset.
* * /transition/:transition -- a kind of transition of the session -- this may return a dynamic asset or it might just process a form -- a change of state expected
* * /transition/secondary -- a handshake that may be required of some assets before delivery of the asset and always finalization of transition
* * '/users/login','/users/logout','/users/register','/users/forgot' -- the start, stop sessions, manage passwords.
* * /users/secondary/:action -- the handler for user session management that may require a handshake or finalization.
*
* Each of these paths hands off processing to a type of contractual class. Each contractual class defines the checks on permission
* and availability that is needed to retrieve an asset or perform an action. (Note: contractual class in this case do not have to
* do with blockchain contract processing [yet such versions of these classes can be imagined]) What is meant by contractual here
* is that the client (browser... usually) and the server will provide authorization, session identity, and token handshakes
* in a particular, well-defined way.
*
* Note that that there are three types of contractual classes:
*
* 1. user processing - this type of processing has to do with the user session being established or terminated and user existence.
* 2. mime processing - This processing has to do with items being returned to the client, e.g. images, text, HTML, JSON, etc.
* 3. transition processing - This proessing has to do with driving a state machine in some way.
*
* In the case of state machine processing, most of the application are just taking in data, sending it somewhere, and updating a database
* about the state of the data and/or the user. In some applications, an actual state machine (for the user) might be implemented and the finalization
* of the state will result in reseting the state of the machine for a particular user.
*
* How the methods map to the contractual methods:
*
* * /static/:asset -- `mime_handler.static_asset_handler`
* * /guarded/static/:asset -- `mime_handler.guarded_static_asset_handler`
* * /guarded/dynamic/:asset -- `mime_handler.guarded_dynamic_asset_handler`
* * /guarded/secondary -- `mime_handler.guarded_secondary_asset_handler`
* * /transition/:transition -- `transition_processing.transition_handler`
* * /transition/secondary -- `transition_processing.secondary_transition_handler`
* * '/users/login','/users/logout','/users/register','/users/forgot' -- user_handler.user_sessions_processing
* * /users/secondary/:action -- `transition_processing.secondary_transition_handler`
*
* @param {object} conf_obj
*/
setup_paths(conf_obj) {
/*
/static/:asset -- previously static_mime. This just returns a static (not computed) piece of information. The app should be able to set the mime type.
/guarded/static/:asset -- previously keyed_mime. Same as above, but checks the session for access.
/guarded/dynamic/:asset -- does the same as static but calls on functions that generate assets -- could be a function service.
/guarded/secondary -- a handshake that may be required of some assets before delivery of the asset.
/transition/:transition -- a kind of transition of the session -- this may return a dynamic asset or it might just process a form -- a change of state expected
/transition/secondary -- a handshake that may be required of some assets before delivery of the asset and always finalization of transition
'/users/login','/users/logout','/users/register','/users/forgot' -- the start, stop sessions, manage passwords.
/users/secondary/:action -- the handler for user session management that may require a handshake or finalization.
*/
// ------------- ------------- ------------- ------------- ------------- ------------- ------------- -------------
// ROOT ... unauthorized entry point -- this is likely to be done by Nginx and will not be needed here.
this.app.get('/', (req, res) => {
try {
let html = this.statics.fetch('index.html');
console.log(html)
res.writeHead(200, { 'Content-Type': 'text/html' });
res.end(html);
} catch (e) {
res.end('system check')
}
});
// STATIC FETCH
this.app.get('/static/:asset', async (req, res) => {
let asset = req.params['asset']
let body = {}
let [code,header,data] = await this.mime_handler.static_asset_handler(asset,body,req.headers)
if ( data !== false ) {
res.writeHead(code,header);
res.end(data);
} else {
res.status(code).send(JSON.stringify(header))
}
});
// ------------- ------------- ------------- ------------- ------------- ------------- ------------- -------------
// STATIC KEYED MIME_TYPES -- no form validation, but GUARD asset within a session
this.app.post('/guarded/static/:asset', async (req, res) => {
let asset = req.params['asset']
let body = req.body
let [code,header,data] = await this.mime_handler.guarded_static_asset_handler(asset,body,req.headers)
if ( typeof data === 'boolean' ) {
res.status(code).send(JSON.stringify(header))
} else {
res.writeHead(code,header);
res.end(data);
}
});
this.app.post('/guarded/dynamic/:asset', async (req, res) => {
let asset = req.params['asset']
let body = req.body
let [code,header,data] = await this.mime_handler.guarded_dynamic_asset_handler(asset,body,req.headers)
if ( typeof data === 'boolean' ) {
res.status(code).send(JSON.stringify(header))
} else {
res.writeHead(code,header);
res.end(data);
}
});
// KEYED MIME_TYPES - TRANSITION ACCEPTED -- the body should send back the token it got with the asset.
this.app.post('/secondary/guarded', async (req,res) => {
let body = req.body
let [code,header,data] = await this.mime_handler.guarded_secondary_asset_handler(body)
if ( typeof data === 'boolean' ) {
res.status(code).send(JSON.stringify(header))
} else {
res.writeHead(code,header);
res.end(data);
}
})
// ------------- ------------- ------------- ------------- ------------- ------------- ------------- -------------
// TRANSITIONS - pure state transition dynamics for sessions
this.app.post('/transition/:transition', async (req, res) => { // the transition is a name or key
let body = req.body
let transition = req.params.transition
let [code,data] = await this.transition_processing.transition_handler(transition,body,req.headers)
this.app.responder(res).status(code).send(data)
});
// TRANSITIONS - TRANSITION ACCEPTED -- the body should send back the token it got with the asset.
this.app.post('/secondary/transition',async (req, res) => {
let body = req.body
//
let [code,data] = await this.transition_processing.secondary_transition_handler(body)
this.app.responder(res).status(code).send(data)
})
// let setup_foreign_auth = false /// conf_obj.foreign_auth.allowed
// ------------- ------------- ------------- ------------- ------------- ------------- ------------- -------------
if ( conf_obj.login_app && Array.isArray(conf_obj.login_app) ) { // LOGIN APPS OPTION (START)
// ------------- ------------- ------------- ------------- ------------- ------------- ------------- -------------
/*
if ( setup_foreign_auth ) {
setup_foreign_auth = (ws) => { this.user_handler.foreign_auth_initializer(ws) }
}
*/
//
// USER MANAGEMENT - handle authorization and user presence.
for ( let path of conf_obj.login_app ) {
//
this.app.post(path, async (req,res) => {
//
let body = req.body
let user_op = body['action']
//
let [code,result] = await this.user_handler.user_sessions_processing(user_op,body)
if ( result.OK === 'true' ) {
let transitionObj = result.data
this.session_manager.handle_cookies(result,res,transitionObj)
}
this.app.responder(res).status(code).send(result)
//
})
}
// USER MANAGEMENT - finalize the user action.
this.app.post('/secondary/users/:action', async (req, res) => {
let body = req.body
let action = req.params['action']
let [code,result] = await this.user_handler.secondary_processing(action,body)
if ( result.OK === 'true' ) {
let transitionObj = result.data
this.session_manager.handle_cookies(result,res,transitionObj)
}
this.app.responder(res).status(code).send(result)
})
// ------------- ------------- ------------- ------------- ------------- ------------- ------------- -------------
} // LOGIN APPS OPTION (END)
// ------------- ------------- ------------- ------------- ------------- ------------- ------------- -------------
}
// ------------- ------------- ------------- ------------- ------------- ------------- ------------- -------------
// // RUN AND STOP
// ------------- ------------- ------------- ------------- ------------- ------------- ------------- -------------
/**
* The web server will start running.
* Before listening, finalize the DB initialization.
* Once listening, complete the initialization of the web socket service if it is being used.
*/
run() {
// APPLICATION STARTUP
this.db.last_step_initalization()
this.app.listen(this.port,() => {
console.log(`listening on ${this.port}`)
if ( this.web_sockets ) {
this.web_sockets.final()
}
});
}
/**
* Establish the signal handler that will allow an external process to bring this process down.
* The handler will shutdown the DB and wait for the DB shutdown to complete.
* In many cases, the DB will write final data to the disk before disconnecting.
* Then, use the shutdown manager to clear out any connections and timers.
* Finally, exit the process.
*/
setup_stopping() {
process.on('SIGINT', async () => {
try {
await this.db.disconnect()
global_shutdown_manager.shutdown_all()
process.exit(0)
/*
this.shutdown_server_helper.shutdown(async (err) => {
process.exit(0)
})
*/
} catch (e) {
console.log(e)
process.exit(0)
}
});
}
// ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
}
// ------------- ------------- ------------- ------------- ------------- ------------- ------------- -------------
/**
*
*/
function generate_password_block() {
//
var passwords = passwordGenerator.generateMultiple(PASSWORD_BLOCKSIZE, {
length: 10,
uppercase: false
});
//
g_password_store = g_password_store.concat(passwords)
}
/**
*
* @param {caller_dir|undefined} caller_dir
* @returns {string} - the directory from which the mod path modules will be loaded.
*/
function module_top(caller_dir) {
if ( typeof caller_dir === "string" ) {
return caller_dir
}
return process.cwd()
}
/**
* Load the configuration. Called by `load_parameters`.
* It is absolutely required that there be a configuration file for any application using this module.
*
* Pleases refer to documentation referened in the readme.md file for a description of the configuration file.
*
* @param {string} cpath
* @param {boolean} if_module_top
* @returns {object} if successful, the configuration object made from reading and parsing the file
*/
function load_configuration(cpath,if_module_top) {
cpath = cpath.trim()
try {
let conf = fs.readFileSync(cpath,'ascii').toString()
return conf
} catch (e) {
console.log(`Error loading configuration ${cpath}... trying another candidate path`)
console.log(e)
let cpath2 = '' + cpath
while ( cpath2[0] === '.' ) {
cpath2 = cpath2.substring(1)
}
cpath2 = process.cwd() + '/' + cpath2
try {
let conf = fs.readFileSync(cpath2,'ascii').toString()
return conf
} catch (e2) {
if ( if_module_top ) {
console.log(`Error loading configuration ${cpath2}... trying another candidate path`)
let cpath3 = module_top(if_module_top) + '/' + cpath
try {
let conf = fs.readFileSync(cpath3,'ascii').toString()
return conf
} catch (e3) {
console.log(`Error loading configuration ${cpath3}... failing`)
console.log(e)
}
}
}
}
throw new Error(`could not find the file ${cpath}`)
}
/**
*
* @param {object} config
* @param {boolean} if_module_top
* @returns {object} - the updated configuration object
*/
function load_parameters(config,if_module_top) {
//
global.g_debug = false
//
//
// clonify
global.clonify = (obj) => {
return(clone(obj))
/*
if ( typeof obj == "object" ) {
return(JSON.parse(JSON.stringify(obj)))
}
return(obj)
*/
}
// global_appwide_token
global.global_appwide_token = () => { // was uuid -- may change
return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
return v.toString(16);
});
}
// isHex
global.isHex = (str) => {
let check = g_hex_re.test(str)
g_hex_re.lastIndex = 0; // be sure to reset the index after using .text()
return(check)
}
// do_hash
if ( config.session_token_hasher ) {
global.do_hash = require(config.session_token_hasher)
config.session_token_hasher = global.do_hash // pass on the override
} else {
global.do_hash = (text) => {
const hash = crypto.createHash('sha256');
hash.update(text);
let ehash = hash.digest('base64url');
return(ehash)
}
}
// global_hasher
if ( config.global_hasher ) {
global.global_hasher = require(config.global_hasher)
config.global_hasher = global.global_hasher // pass on the override
} else {
global.global_hasher = (str,specials) => { // global_hasher(user_str,ipfs) // can ask to store the record on chain...
if ( str ) {
return do_hash(str)
}
return('')
}
}
generate_password_block()
// generate_password
global.generate_password = () => {
let password = g_password_store.shift()
if ( g_password_store.length < PASSWORD_DEPLETION_MIN ) {
setTimeout(generate_password_block,100)
}
return(password)
}
global.global_shutdown_manager = new ShutdownManager()
try {
let data = load_configuration(config,if_module_top)
//
//console.log(data[p] + " --- " + data.substr(p,40))
//
let confJSON = JSON.parse(data)
let module_path = confJSON.module_path
global.global_module_path = module_path
confJSON.mod_path = {}
g_expected_modules.forEach(mname => {
let modName = confJSON.modules[mname]
if ( (typeof modName === 'string') || ( modName === undefined ) ) {
if ( modName ) {
confJSON.mod_path[mname] = module_top(if_module_top) + `/${module_path}/${modName}`
} else {
confJSON.mod_path[mname] = __dirname + `/defaults/lib/default_${mname}`
}
} else if ( typeof modName === 'object' ) { // allow for modules from other locations
modName = modName.module
let alternate_mod_path = modName.mod_path // perhaps filter this in the future to attain some standard in locations..
confJSON.mod_path[mname] = module_top(if_module_top) + `/${alternate_mod_path}/${modName}`
} else {
console.log(mname,modName)
throw new Error("ill formed module name in config file")
}
})
return(confJSON)
} catch (e) {
console.log(e)
process.exit(1)
}
}
module.exports = CopiousTransitions
</code></pre>
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