feat(api): trying typeorm's value transformers

apps/api/src/app/shared/transformers/big-number.transformer.ts

@@ -0,0 +1,16 @@
+// import { ValueTransformer } from 'typeorm'
+// import { BigNumber } from 'bignumber.js'
+//
+// export class BigNumberTransformer implements ValueTransformer {
+//
+//   to(value: BigNumber): string | undefined {
+//     if (!value) return undefined
+//     return value.toString(10)
+//   }
+//
+//   from(value: string): BigNumber | undefined {
+//     if (!value) return undefined
+//     return new BigNumber(value, 10)
+//   }
+//
+// }

apps/api/src/app/shared/transformers/board.transformer.ts

@@ -0,0 +1,13 @@
+import { ValueTransformer } from 'typeorm';
+
+export class BoardTransformer implements ValueTransformer {
+  // Store the board as a stringified 3d string array,
+  // Access the board as a parsed 3d array.
+  to(board: string[][]): string {
+    return JSON.stringify(board);
+  }
+
+  from(stringified: string): string[] {
+    return JSON.parse(stringified);
+  }
+}

apps/api/src/app/shared/transformers/index.ts

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+export { BoardTransformer } from './board.transformer';
+export { LowerCaseTransformer } from './lower-case.transformer';
+export { PasswordTransformer } from './password.transformer';

apps/api/src/app/shared/transformers/lower-case.transformer.ts

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+import { ValueTransformer } from 'typeorm';
+
+export class LowerCaseTransformer implements ValueTransformer {
+  to(entityValue: string) {
+    return entityValue.toLocaleLowerCase();
+  }
+  from(databaseValue: string) {
+    return databaseValue;
+  }
+}

apps/api/src/app/shared/transformers/password.transformer.ts

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+import * as crypto from 'crypto';
+import { ValueTransformer } from 'typeorm';
+
+export class PasswordTransformer implements ValueTransformer {
+  to(value) {
+    return crypto.createHmac('sha256', value).digest('hex');
+  }
+  from(value) {
+    return value;
+  }
+}