feat!: Integrate MongoOptions parser into driver

MongoOptions introduce a well typed HostAddress type that tracks
the correct shape of a host's address depending on its type.
The MongoClientOptions type inherit from node's TLS and Socket options
and use our allow list of options to maintain a connection between the
types and programmatic processing of options. The hierarchy of options
from MongoClient > Topology > Server > ConnectionPool > Connection have
been corrected and clarified for responsibilities.

NODE-2704

.eslintignore

@@ -1,2 +1,3 @@
 docs
 lib
+test/disabled

package.json

@@ -37,6 +37,7 @@
     "@types/bl": "^2.1.0",
     "@types/bson": "^4.0.2",
     "@types/kerberos": "^1.1.0",
+    "@types/mocha": "^8.2.0",
     "@types/node": "^14.6.4",
     "@types/saslprep": "^1.0.0",
     "@typescript-eslint/eslint-plugin": "^3.10.0",

src/bson.ts

@@ -37,7 +37,7 @@ import type { SerializeOptions } from 'bson';
  * BSON Serialization options.
  * @public
  */
-export interface BSONSerializeOptions extends SerializeOptions {
+export interface BSONSerializeOptions extends Omit<SerializeOptions, 'index'> {
   /** Return document results as raw BSON buffers */
   fieldsAsRaw?: { [key: string]: boolean };
   /** Promotes BSON values to native types where possible, set to false to only receive wrapper types */

src/cmap/auth/defaultAuthProviders.ts

@@ -21,20 +21,12 @@ export const AuthMechanism = {
 /** @public */
 export type AuthMechanismId = typeof AuthMechanism[keyof typeof AuthMechanism];
 
-export const AUTH_PROVIDERS = {
-  [AuthMechanism.MONGODB_AWS]: new MongoDBAWS(),
-  [AuthMechanism.MONGODB_CR]: new MongoCR(),
-  [AuthMechanism.MONGODB_GSSAPI]: new GSSAPI(),
-  [AuthMechanism.MONGODB_PLAIN]: new Plain(),
-  [AuthMechanism.MONGODB_SCRAM_SHA1]: new ScramSHA1(),
-  [AuthMechanism.MONGODB_SCRAM_SHA256]: new ScramSHA256(),
-  [AuthMechanism.MONGODB_X509]: new X509()
-};
-
-// TODO: We can make auth mechanism more functional since we pass around a context object
-// and we improve the the typing here to use the enum, the current issue is that the mechanism is
-// 'default' until resolved maybe we can do that resolution here and make the this strictly
-// AuthMechanism -> AuthProviders
-export function defaultAuthProviders(): Record<string, AuthProvider> {
-  return AUTH_PROVIDERS;
-}
+export const AUTH_PROVIDERS = new Map<AuthMechanismId | string, AuthProvider>([
+  [AuthMechanism.MONGODB_AWS, new MongoDBAWS()],
+  [AuthMechanism.MONGODB_CR, new MongoCR()],
+  [AuthMechanism.MONGODB_GSSAPI, new GSSAPI()],
+  [AuthMechanism.MONGODB_PLAIN, new Plain()],
+  [AuthMechanism.MONGODB_SCRAM_SHA1, new ScramSHA1()],
+  [AuthMechanism.MONGODB_SCRAM_SHA256, new ScramSHA256()],
+  [AuthMechanism.MONGODB_X509, new X509()]
+]);

src/cmap/auth/gssapi.ts

@@ -60,16 +60,10 @@ export class GSSAPI extends AuthProvider {
   }
 }
 function makeKerberosClient(authContext: AuthContext, callback: Callback<KerberosClient>): void {
-  const { host, port } = authContext.options;
+  const { hostAddress } = authContext.options;
   const { credentials } = authContext;
-  if (!host || !port || !credentials) {
-    return callback(
-      new MongoError(
-        `Connection must specify: ${host ? 'host' : ''}, ${port ? 'port' : ''}, ${
-          credentials ? 'host' : 'credentials'
-        }.`
-      )
-    );
+  if (!hostAddress || typeof hostAddress.host !== 'string' || !credentials) {
+    return callback(new MongoError('Connection must have host and port and credentials defined.'));
   }
 
   if ('kModuleError' in Kerberos) {
@@ -83,7 +77,7 @@ function makeKerberosClient(authContext: AuthContext, callback: Callback<Kerbero
     'mongodb';
 
   performGssapiCanonicalizeHostName(
-    host,
+    hostAddress.host,
     mechanismProperties as MechanismProperties,
     (err?: Error | MongoError, host?: string) => {
       if (err) return callback(err);

src/cmap/auth/mongo_credentials.ts

@@ -147,15 +147,15 @@ export class MongoCredentials {
   }
 
   static merge(
-    creds: MongoCredentials,
+    creds: MongoCredentials | undefined,
     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
+      username: options.username ?? creds?.username ?? '',
+      password: options.password ?? creds?.password ?? '',
+      mechanism: options.mechanism ?? creds?.mechanism ?? AuthMechanism.MONGODB_DEFAULT,
+      mechanismProperties: options.mechanismProperties ?? creds?.mechanismProperties ?? {},
+      source: options.source ?? options.db ?? creds?.source ?? 'admin'
     });
   }
 }

src/cmap/auth/mongodb_aws.ts

@@ -45,7 +45,7 @@ export class MongoDBAWS extends AuthProvider {
 
     if (credentials.username == null) {
       makeTempCredentials(credentials, (err, tempCredentials) => {
-        if (err) return callback(err);
+        if (err || !tempCredentials) return callback(err);
 
         authContext.credentials = tempCredentials;
         this.auth(authContext, callback);