From ded00b680a776d03cd8c928354c87c0be8690f56 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian@dold.me>
Date: Wed, 12 Oct 2022 22:27:50 +0200
Subject: wallet-core: implement enabling/disabling dev mode

---
 packages/taler-wallet-core/src/dev-experiments.ts | 118 +++++++++++++++++++++-
 1 file changed, 117 insertions(+), 1 deletion(-)

(limited to 'packages/taler-wallet-core/src/dev-experiments.ts')

diff --git a/packages/taler-wallet-core/src/dev-experiments.ts b/packages/taler-wallet-core/src/dev-experiments.ts
index 8e2ce5882..c3167b3e4 100644
--- a/packages/taler-wallet-core/src/dev-experiments.ts
+++ b/packages/taler-wallet-core/src/dev-experiments.ts
@@ -25,14 +25,130 @@
  * Imports.
  */
 
-import { Logger } from "@gnu-taler/taler-util";
+import { Logger, parseDevExperimentUri } from "@gnu-taler/taler-util";
+import { ConfigRecordKey } from "./db.js";
 import { InternalWalletState } from "./internal-wallet-state.js";
+import {
+  HttpRequestLibrary,
+  HttpRequestOptions,
+  HttpResponse,
+} from "./util/http.js";
 
 const logger = new Logger("dev-experiments.ts");
 
+/**
+ * Apply a dev experiment to the wallet database / state.
+ */
 export async function applyDevExperiment(
   ws: InternalWalletState,
   uri: string,
 ): Promise<void> {
   logger.info(`applying dev experiment ${uri}`);
+  const parsedUri = parseDevExperimentUri(uri);
+  if (!parsedUri) {
+    logger.info("unable to parse dev experiment URI");
+    return;
+  }
+  if (parsedUri.devExperimentId == "enable-devmode") {
+    logger.info("enabling devmode");
+    await ws.db
+      .mktx((x) => [x.config])
+      .runReadWrite(async (tx) => {
+        tx.config.put({
+          key: ConfigRecordKey.DevMode,
+          value: true,
+        });
+      });
+    await maybeInitDevMode(ws);
+    return;
+  }
+  if (parsedUri.devExperimentId === "disable-devmode") {
+    logger.info("disabling devmode");
+    await ws.db
+      .mktx((x) => [x.config])
+      .runReadWrite(async (tx) => {
+        tx.config.put({
+          key: ConfigRecordKey.DevMode,
+          value: false,
+        });
+      });
+    await leaveDevMode(ws);
+    return;
+  }
+  if (!ws.devModeActive) {
+    throw Error(
+      "can't handle devmode URI (other than enable-devmode) unless devmode is active",
+    );
+  }
+  throw Error(`dev-experiment id not understood ${parsedUri.devExperimentId}`);
+}
+
+/**
+ * Enter dev mode, if the wallet's config entry in the DB demands it.
+ */
+export async function maybeInitDevMode(ws: InternalWalletState): Promise<void> {
+  const devMode = await ws.db
+    .mktx((x) => [x.config])
+    .runReadOnly(async (tx) => {
+      const rec = await tx.config.get(ConfigRecordKey.DevMode);
+      if (!rec || rec.key !== ConfigRecordKey.DevMode) {
+        return false;
+      }
+      return rec.value;
+    });
+  if (!devMode) {
+    ws.devModeActive = false;
+    return;
+  }
+  ws.devModeActive = true;
+  if (ws.http instanceof DevExperimentHttpLib) {
+    return;
+  }
+  ws.http = new DevExperimentHttpLib(ws.http);
+}
+
+export async function leaveDevMode(ws: InternalWalletState): Promise<void> {
+  if (ws.http instanceof DevExperimentHttpLib) {
+    ws.http = ws.http.underlyingLib;
+  }
+  ws.devModeActive = false;
+}
+
+export class DevExperimentHttpLib implements HttpRequestLibrary {
+  _isDevExperimentLib = true;
+  underlyingLib: HttpRequestLibrary;
+
+  constructor(lib: HttpRequestLibrary) {
+    this.underlyingLib = lib;
+  }
+
+  get(
+    url: string,
+    opt?: HttpRequestOptions | undefined,
+  ): Promise<HttpResponse> {
+    return this.fetch(url, {
+      method: "GET",
+      ...opt,
+    });
+  }
+
+  postJson(
+    url: string,
+    body: any,
+    opt?: HttpRequestOptions | undefined,
+  ): Promise<HttpResponse> {
+    return this.fetch(url, {
+      method: "POST",
+      body,
+      ...opt,
+    });
+  }
+
+  fetch(
+    url: string,
+    opt?: HttpRequestOptions | undefined,
+  ): Promise<HttpResponse> {
+    logger.info(`devexperiment httplib ${url}`);
+    return this.underlyingLib.fetch(url, opt);
+  }
 }
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