🌟 Refactor

- Moved mappings into Sb1 impl
- Moved Actual types to @common
- Moved createDirIfMissing to respective functions
- Refactored main into multiple functions
- Moved create db into Sb1impl and close
- Log requests on info

packages/sparebank1/sparebank1.ts

@@ -0,0 +1,95 @@
+import {
+  BANK_INITIAL_REFRESH_TOKEN,
+  BANK_OAUTH_CLIENT_ID,
+  BANK_OAUTH_CLIENT_SECRET,
+  DB_DIRECTORY,
+  DB_FILENAME,
+} from "@/config.ts"
+import logger from "@common/logger.ts"
+import dayjs from "dayjs"
+import type { Database } from "better-sqlite3"
+import {
+  clearTokens,
+  createDb,
+  fetchToken,
+  insertTokens,
+} from "@sb1impl/db/queries.ts"
+import * as Oauth from "@sb1/oauth.ts"
+import * as Transactions from "@sb1/transactions.ts"
+import { bankTransactionIntoActualTransaction } from "./mappings.ts"
+import type { OAuthTokenResponse } from "@sb1/types.ts"
+import type { ActualTransaction, Bank, Interval } from "@common/types.ts"
+import type { TokenResponse } from "@sb1impl/db/types.ts"
+import { createDirIfMissing } from "@/fs.ts"
+
+export class Sparebank1Impl implements Bank {
+  private readonly db: Database
+
+  constructor() {
+    createDirIfMissing(DB_DIRECTORY)
+    const databaseFilePath = `${DB_DIRECTORY}/${DB_FILENAME}.sqlite`
+    this.db = createDb(databaseFilePath)
+  }
+
+  async fetchTransactions(
+    interval: Interval,
+    ...accountKeys: ReadonlyArray<string>
+  ): Promise<ReadonlyArray<ActualTransaction>> {
+    const response = await Transactions.list(
+      await this.getAccessToken(),
+      accountKeys,
+      interval,
+    )
+    const sparebankTransactions = response.transactions
+    return sparebankTransactions.map(bankTransactionIntoActualTransaction)
+  }
+
+  shutdown(): void {
+    this.db.close()
+  }
+
+  private async getAccessToken(): Promise<string> {
+    const accessToken = fetchToken(this.db, "access-token")
+
+    if (accessToken && this.isValidToken(accessToken)) {
+      return accessToken.token
+    }
+    const response = await this.fetchNewTokens()
+    return response.access_token
+  }
+
+  private isValidToken(tokenResponse: TokenResponse): boolean {
+    // TODO make sure the same timezone is used. Db uses UTC
+    return dayjs().isBefore(tokenResponse.expires_at)
+  }
+
+  private async getRefreshToken(): Promise<string> {
+    const tokenResponse = fetchToken(this.db, "refresh-token")
+
+    if (!tokenResponse) {
+      return BANK_INITIAL_REFRESH_TOKEN
+    } else if (this.isValidToken(tokenResponse)) {
+      return tokenResponse.token
+    }
+    logger.warn("Refresh token expired, deleting tokens from database")
+    clearTokens(this.db)
+    throw new Error("Refresh token is expired. Create a new one")
+  }
+
+  private async fetchNewTokens(): Promise<OAuthTokenResponse> {
+    const refreshToken = await this.getRefreshToken()
+    const result = await Oauth.refreshToken(
+      BANK_OAUTH_CLIENT_ID,
+      BANK_OAUTH_CLIENT_SECRET,
+      refreshToken,
+    )
+
+    if (result.status === "failure") {
+      throw new Error(`Failed to fetch refresh token: '${result.data}'`)
+    }
+    const oAuthToken = result.data
+
+    insertTokens(this.db, oAuthToken)
+    return oAuthToken
+  }
+}