Add basic LDAP bind functionality

app/unit/LDAPRoutingUnit.js

@@ -0,0 +1,101 @@
+const CanonicalUnit = require('libflitter/canon/CanonicalUnit')
+
+class LDAPRoutingUnit extends CanonicalUnit {
+    static get name() {
+        return 'ldap_routers'
+    }
+
+    static get services() {
+        return [...super.services, 'output', 'canon', 'ldap_server']
+    }
+
+    constructor(base_directory = './app/ldap/routes') {
+        super(base_directory)
+
+        this.canonical_item = 'ldap_router'
+        this.suffix = '.routes.js'
+    }
+
+    async init_canonical_file({app, name, instance}) {
+        const router_middleware = []
+        if ( !instance ) {
+            this.output.warn(`Skipping LDAP routing file ${name}. No members were exported.`)
+        }
+
+        this.output.info(`Building LDAP routes for router ${name}.`)
+
+        // Load the router-level middleware functions
+        if ( Array.isArray(instance.middleware) ) {
+            for ( const mw of instance.middleware ) {
+                const mw_instance = this.canon.get(`ldap_middleware::${mw}`)
+                if ( !mw_instance ) {
+                    const msg = `Unable to create LDAP routes. Invalid or unknown LDAP middleware: ldap_middleware::${mw} in router ${name}.`
+                    this.output.error(msg)
+                    throw new Error(msg)
+                }
+
+                router_middleware.push(mw_instance)
+            }
+        }
+
+        this.output.debug(`Found ${router_middleware.length} router-level middlewares.`)
+
+        // Determine the prefix (suffix) and total suffix from config
+        let suffix = []
+        if ( instance.prefix && typeof instance.prefix === 'string' ) {
+            suffix.push(instance.prefix)
+        } else if ( instance.prefix !== false ) {
+            this.output.warn(`No prefix specified for LDAP routing file ${name}.`)
+        }
+
+        // If the server has a base DC=...,DC=... &c. suffix, include that
+        if ( this.ldap_server.config.schema.base_dc ) {
+            suffix.push(this.ldap_server.config.schema.base_dc)
+        }
+
+        suffix = suffix.join(',')
+
+        // Load the individual routes
+        const supported_ldap_types = [
+            'search', 'bind', 'add', 'del', 'modify', 'compare', 'modifyDN', 'exop', 'unbind',
+        ]
+
+        // Iterate over the various query types that might be in the definition
+        for ( const type of supported_ldap_types ) {
+            if ( typeof instance[type] === 'object' ) {
+                // Iterate over each of the route definitions in the type definition
+                for ( const route_prefix in instance[type] ) {
+                    if ( !instance[type].hasOwnProperty(route_prefix) ) continue
+                    let route_handlers = instance[type][route_prefix]
+                    if ( typeof route_handlers === 'string' ) route_handlers = [route_handlers]
+
+                    if ( !Array.isArray(route_handlers) ) {
+                        const msg = `Invalid route handlers for route ${route_prefix} (${type}) in router ${name}.`
+                        this.output.error(msg)
+                        throw new Error(msg)
+                    }
+
+                    let route_functions = [...router_middleware]
+                    // For each of the route handler definitions, resolve the canonical
+                    for ( const route_handler_name of route_handlers ) {
+                        const route_handler = this.canon.get(route_handler_name)
+                        if ( !route_handler || typeof route_handler !== 'function' ) {
+                            const msg = `Unable to resolve route handler for route ${route_prefix} (${type}) in router ${name}. Handler name: ${route_handler_name}`
+                            this.output.error(msg)
+                            throw new Error(msg)
+                        }
+
+                        route_functions.push(route_handler)
+                    }
+
+                    this.output.debug(`Registering route ${type} :: ${[route_prefix, suffix].join(',')} with ${route_functions.length} handlers.`)
+                    this.ldap_server.server[type]([route_prefix, suffix].join(','), ...route_functions)
+                }
+            } else {
+                this.output.warn(`Missing or invalid LDAP protocol definition ${type} in router ${name}. The protocol will be skipped.`)
+            }
+        }
+    }
+}
+
+module.exports = exports = LDAPRoutingUnit