feat: Add MongoOption builder logic (#2623)

Parse options from uri and object using a unified registry creating 
frozen MongoOptions interface object.

NODE-2699 NODE-2698

src/cmap/auth/defaultAuthProviders.ts

@@ -7,16 +7,19 @@ import { MongoDBAWS } from './mongodb_aws';
 import type { AuthProvider } from './auth_provider';
 
 /** @public */
-export enum AuthMechanism {
-  MONGODB_AWS = 'MONGODB-AWS',
-  MONGODB_CR = 'MONGODB-CR',
-  MONGODB_DEFAULT = 'DEFAULT',
-  MONGODB_GSSAPI = 'GSSAPI',
-  MONGODB_PLAIN = 'PLAIN',
-  MONGODB_SCRAM_SHA1 = 'SCRAM-SHA-1',
-  MONGODB_SCRAM_SHA256 = 'SCRAM-SHA-256',
-  MONGODB_X509 = 'MONGODB-X509'
-}
+export const AuthMechanism = {
+  MONGODB_AWS: 'MONGODB-AWS',
+  MONGODB_CR: 'MONGODB-CR',
+  MONGODB_DEFAULT: 'DEFAULT',
+  MONGODB_GSSAPI: 'GSSAPI',
+  MONGODB_PLAIN: 'PLAIN',
+  MONGODB_SCRAM_SHA1: 'SCRAM-SHA-1',
+  MONGODB_SCRAM_SHA256: 'SCRAM-SHA-256',
+  MONGODB_X509: 'MONGODB-X509'
+} as const;
+
+/** @public */
+export type AuthMechanismId = typeof AuthMechanism[keyof typeof AuthMechanism];
 
 export const AUTH_PROVIDERS = {
   [AuthMechanism.MONGODB_AWS]: new MongoDBAWS(),

src/cmap/auth/mongo_credentials.ts

@@ -1,15 +1,15 @@
 // Resolves the default auth mechanism according to
 
 import type { Document } from '../../bson';
-import { AuthMechanism } from './defaultAuthProviders';
+import { AuthMechanismId, AuthMechanism } from './defaultAuthProviders';
 
 // https://github.com/mongodb/specifications/blob/master/source/auth/auth.rst
-function getDefaultAuthMechanism(ismaster?: Document): AuthMechanism {
+function getDefaultAuthMechanism(ismaster?: Document): AuthMechanismId {
   if (ismaster) {
     // If ismaster contains saslSupportedMechs, use scram-sha-256
     // if it is available, else scram-sha-1
     if (Array.isArray(ismaster.saslSupportedMechs)) {
-      return ismaster.saslSupportedMechs.indexOf('SCRAM-SHA-256') >= 0
+      return ismaster.saslSupportedMechs.includes(AuthMechanism.MONGODB_SCRAM_SHA256)
         ? AuthMechanism.MONGODB_SCRAM_SHA256
         : AuthMechanism.MONGODB_SCRAM_SHA1;
     }
@@ -30,7 +30,7 @@ export interface MongoCredentialsOptions {
   password: string;
   source: string;
   db?: string;
-  mechanism?: AuthMechanism;
+  mechanism?: AuthMechanismId;
   mechanismProperties: Document;
 }
 
@@ -46,7 +46,7 @@ export class MongoCredentials {
   /** The database that the user should authenticate against */
   readonly source: string;
   /** The method used to authenticate */
-  readonly mechanism: AuthMechanism;
+  readonly mechanism: AuthMechanismId;
   /** Special properties used by some types of auth mechanisms */
   readonly mechanismProperties: Document;
 
@@ -108,4 +108,54 @@ export class MongoCredentials {
 
     return this;
   }
+
+  validate(): void {
+    if (
+      (this.mechanism === AuthMechanism.MONGODB_GSSAPI ||
+        this.mechanism === AuthMechanism.MONGODB_CR ||
+        this.mechanism === AuthMechanism.MONGODB_PLAIN ||
+        this.mechanism === AuthMechanism.MONGODB_SCRAM_SHA1 ||
+        this.mechanism === AuthMechanism.MONGODB_SCRAM_SHA256) &&
+      !this.username
+    ) {
+      throw new TypeError(`Username required for mechanism '${this.mechanism}'`);
+    }
+
+    if (
+      this.mechanism === AuthMechanism.MONGODB_GSSAPI ||
+      this.mechanism === AuthMechanism.MONGODB_AWS ||
+      this.mechanism === AuthMechanism.MONGODB_X509
+    ) {
+      if (this.source != null && this.source !== '$external') {
+        throw new TypeError(
+          `Invalid source '${this.source}' for mechanism '${this.mechanism}' specified.`
+        );
+      }
+    }
+
+    if (this.mechanism === AuthMechanism.MONGODB_PLAIN && this.source == null) {
+      throw new TypeError('PLAIN Authentication Mechanism needs an auth source');
+    }
+
+    if (this.mechanism === AuthMechanism.MONGODB_X509 && this.password != null) {
+      if (this.password === '') {
+        Reflect.set(this, 'password', undefined);
+        return;
+      }
+      throw new TypeError(`Password not allowed for mechanism MONGODB-X509`);
+    }
+  }
+
+  static merge(
+    creds: MongoCredentials,
+    options: Partial<MongoCredentialsOptions>
+  ): MongoCredentials {
+    return new MongoCredentials({
+      username: options.username ?? creds.username,
+      password: options.password ?? creds.password,
+      mechanism: options.mechanism ?? creds.mechanism,
+      mechanismProperties: options.mechanismProperties ?? creds.mechanismProperties,
+      source: options.source ?? creds.source ?? options.db
+    });
+  }
 }

src/cmap/auth/scram.ts

@@ -7,6 +7,7 @@ import type { MongoCredentials } from './mongo_credentials';
 import type { HandshakeDocument } from '../connect';
 
 import { saslprep } from '../../deps';
+import { AuthMechanism } from './defaultAuthProviders';
 
 type CryptoMethod = 'sha1' | 'sha256';
 
@@ -83,7 +84,8 @@ function makeFirstMessage(
   nonce: Buffer
 ) {
   const username = cleanUsername(credentials.username);
-  const mechanism = cryptoMethod === 'sha1' ? 'SCRAM-SHA-1' : 'SCRAM-SHA-256';
+  const mechanism =
+    cryptoMethod === 'sha1' ? AuthMechanism.MONGODB_SCRAM_SHA1 : AuthMechanism.MONGODB_SCRAM_SHA256;
 
   // NOTE: This is done b/c Javascript uses UTF-16, but the server is hashing in UTF-8.
   // Since the username is not sasl-prep-d, we need to do this here.

src/cmap/connection.ts

@@ -27,10 +27,10 @@ import type { Server } from '../sdam/server';
 import type { MongoCredentials } from './auth/mongo_credentials';
 import type { CommandOptions } from './wire_protocol/command';
 import type { GetMoreOptions } from './wire_protocol/get_more';
-import type { InsertOptions, UpdateOptions, RemoveOptions } from './wire_protocol/index';
 import type { Stream } from './connect';
 import type { LoggerOptions } from '../logger';
 import type { QueryOptions } from './wire_protocol/query';
+import type { WriteCommandOptions } from './wire_protocol/write_command';
 
 const kStream = Symbol('stream');
 const kQueue = Symbol('queue');
@@ -280,17 +280,17 @@ export class Connection extends EventEmitter {
   }
 
   /** @internal */
-  insert(ns: string, ops: Document[], options: InsertOptions, callback: Callback): void {
+  insert(ns: string, ops: Document[], options: WriteCommandOptions, callback: Callback): void {
     wp.insert(makeServerTrampoline(this), ns, ops, options, callback);
   }
 
   /** @internal */
-  update(ns: string, ops: Document[], options: UpdateOptions, callback: Callback): void {
+  update(ns: string, ops: Document[], options: WriteCommandOptions, callback: Callback): void {
     wp.update(makeServerTrampoline(this), ns, ops, options, callback);
   }
 
   /** @internal */
-  remove(ns: string, ops: Document[], options: RemoveOptions, callback: Callback): void {
+  remove(ns: string, ops: Document[], options: WriteCommandOptions, callback: Callback): void {
     wp.remove(makeServerTrampoline(this), ns, ops, options, callback);
   }
 }

src/cmap/wire_protocol/index.ts

@@ -11,40 +11,31 @@ import type { Callback } from '../../utils';
 
 export { writeCommand };
 
-/** @internal */
-export type InsertOptions = WriteCommandOptions;
-
 export function insert(
   server: Server,
   ns: string,
   ops: Document[],
-  options: InsertOptions,
+  options: WriteCommandOptions,
   callback: Callback
 ): void {
   writeCommand(server, 'insert', 'documents', ns, ops, options, callback);
 }
 
-/** @internal */
-export type UpdateOptions = WriteCommandOptions;
-
 export function update(
   server: Server,
   ns: string,
   ops: Document[],
-  options: UpdateOptions,
+  options: WriteCommandOptions,
   callback: Callback
 ): void {
   writeCommand(server, 'update', 'updates', ns, ops, options, callback);
 }
 
-/** @internal */
-export type RemoveOptions = WriteCommandOptions;
-
 export function remove(
   server: Server,
   ns: string,
   ops: Document[],
-  options: RemoveOptions,
+  options: WriteCommandOptions,
   callback: Callback
 ): void {
   writeCommand(server, 'delete', 'deletes', ns, ops, options, callback);