enhance: make active email validation configurable

packages/backend/migration/1657346559800-active-email-validation.js

@@ -0,0 +1,11 @@
+export class activeEmailValidation1657346559800 {
+    name = 'activeEmailValidation1657346559800'
+
+    async up(queryRunner) {
+        await queryRunner.query(`ALTER TABLE "meta" ADD "enableActiveEmailValidation" boolean NOT NULL DEFAULT true`);
+    }
+
+    async down(queryRunner) {
+        await queryRunner.query(`ALTER TABLE "meta" DROP COLUMN "enableActiveEmailValidation"`);
+    }
+}

packages/backend/src/models/entities/meta.ts

@@ -454,4 +454,9 @@ export class Meta {
 		default: false,
 	})
 	public enableIpLogging: boolean;
+
+	@Column('boolean', {
+		default: true,
+	})
+	public enableActiveEmailValidation: boolean;
 }

packages/backend/src/server/api/endpoints/admin/meta.ts

@@ -324,6 +324,10 @@ export const meta = {
 				type: 'boolean',
 				optional: true, nullable: false,
 			},
+			enableActiveEmailValidation: {
+				type: 'boolean',
+				optional: true, nullable: false,
+			},
 		},
 	},
 } as const;
@@ -421,5 +425,6 @@ export default define(meta, paramDef, async (ps, me) => {
 		deeplAuthKey: instance.deeplAuthKey,
 		deeplIsPro: instance.deeplIsPro,
 		enableIpLogging: instance.enableIpLogging,
+		enableActiveEmailValidation: instance.enableActiveEmailValidation,
 	};
 });

packages/backend/src/server/api/endpoints/admin/update-meta.ts

@@ -101,6 +101,7 @@ export const paramDef = {
 		objectStorageSetPublicRead: { type: 'boolean' },
 		objectStorageS3ForcePathStyle: { type: 'boolean' },
 		enableIpLogging: { type: 'boolean' },
+		enableActiveEmailValidation: { type: 'boolean' },
 	},
 	required: [],
 } as const;
@@ -421,6 +422,10 @@ export default define(meta, paramDef, async (ps, me) => {
 		set.enableIpLogging = ps.enableIpLogging;
 	}
 
+	if (ps.enableActiveEmailValidation !== undefined) {
+		set.enableActiveEmailValidation = ps.enableActiveEmailValidation;
+	}
+
 	await db.transaction(async transactionalEntityManager => {
 		const metas = await transactionalEntityManager.find(Meta, {
 			order: {

packages/backend/src/services/validate-email-for-account.ts

@@ -1,34 +1,37 @@
 import { validate as validateEmail } from 'deep-email-validator';
 import { UserProfiles } from '@/models/index.js';
+import { fetchMeta } from '@/misc/fetch-meta.js';
 
 export async function validateEmailForAccount(emailAddress: string): Promise<{
 	available: boolean;
 	reason: null | 'used' | 'format' | 'disposable' | 'mx' | 'smtp';
 }> {
+	const meta = await fetchMeta();
+
 	const exist = await UserProfiles.countBy({
 		emailVerified: true,
 		email: emailAddress,
 	});
 
-	const validated = await validateEmail({
+	const validated = meta.enableActiveEmailValidation ? await validateEmail({
 		email: emailAddress,
 		validateRegex: true,
 		validateMx: true,
 		validateTypo: false, // TLDを見ているみたいだけどclubとか弾かれるので
 		validateDisposable: true, // 捨てアドかどうかチェック
 		validateSMTP: false, // 日本だと25ポートが殆どのプロバイダーで塞がれていてタイムアウトになるので
-	});
+	}) : { valid: true };
 
 	const available = exist === 0 && validated.valid;
 
 	return {
 		available,
 		reason: available ? null :
-			exist !== 0 ? 'used' :
-			validated.reason === 'regex' ? 'format' :
-			validated.reason === 'disposable' ? 'disposable' :
-			validated.reason === 'mx' ? 'mx' :
-			validated.reason === 'smtp' ? 'smtp' :
-			null,
+		exist !== 0 ? 'used' :
+		validated.reason === 'regex' ? 'format' :
+		validated.reason === 'disposable' ? 'disposable' :
+		validated.reason === 'mx' ? 'mx' :
+		validated.reason === 'smtp' ? 'smtp' :
+		null,
 	};
 }