[taler-wallet-core] 08/20: preparing for the new token api

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sebasjm pushed a commit to branch master
in repository wallet-core.

commit af623f5096138631383719bf737f5ff21660e052
Author: Sebastian <sebasjm@gmail.com>
AuthorDate: Thu Sep 21 13:54:02 2023 -0300

    preparing for the new token api
---
 packages/demobank-ui/src/hooks/backend.ts          |   2 +-
 .../demobank-ui/src/hooks/useCredentialsChecker.ts | 130 +++++++++++++++++++++
 packages/demobank-ui/src/pages/LoginForm.tsx       |   7 +-
 3 files changed, 136 insertions(+), 3 deletions(-)

diff --git a/packages/demobank-ui/src/hooks/backend.ts 
b/packages/demobank-ui/src/hooks/backend.ts
index c05ab33e9..9d32db4b8 100644
--- a/packages/demobank-ui/src/hooks/backend.ts
+++ b/packages/demobank-ui/src/hooks/backend.ts
@@ -255,7 +255,7 @@ interface InvalidationResult {
   error: unknown;
 }
 
-export function useCredentialsChecker() {
+export function useCredentialsCheckerOld() {
   const { request } = useApiContext();
   const baseUrl = getInitialBackendBaseURL();
   //check against account details endpoint
diff --git a/packages/demobank-ui/src/hooks/useCredentialsChecker.ts 
b/packages/demobank-ui/src/hooks/useCredentialsChecker.ts
new file mode 100644
index 000000000..b76754ffe
--- /dev/null
+++ b/packages/demobank-ui/src/hooks/useCredentialsChecker.ts
@@ -0,0 +1,130 @@
+import { AbsoluteTime, HttpStatusCode } from "@gnu-taler/taler-util";
+import { ErrorType, HttpError, RequestError, useApiContext } from 
"@gnu-taler/web-util/browser";
+import { getInitialBackendBaseURL } from "./backend.js";
+
+export function useCredentialsChecker() {
+  const { request } = useApiContext();
+  const baseUrl = getInitialBackendBaseURL();
+  //check against instance details endpoint
+  //while merchant backend doesn't have a login endpoint
+  async function requestNewLoginToken(
+    username: string,
+    password: AccessToken,
+  ): Promise<LoginResult> {
+    const data: LoginTokenRequest = {
+      scope: "write",
+      duration: {
+        d_us: "forever"
+      },
+      refreshable: true,
+    }
+    try {
+      const response = await request<LoginTokenSuccessResponse>(baseUrl, 
`accounts/${username}/token`, {
+        method: "POST",
+        token: password,
+        data
+      });
+      return { valid: true, token: response.data.token, expiration: 
response.data.expiration };
+    } catch (error) {
+      if (error instanceof RequestError) {
+        return { valid: false, cause: error.cause };
+      }
+
+      return {
+        valid: false, cause: {
+          type: ErrorType.UNEXPECTED,
+          loading: false,
+          info: {
+            hasToken: true,
+            status: 0,
+            options: {},
+            url: `/private/token`,
+            payload: {}
+          },
+          exception: error,
+          message: (error instanceof Error ? error.message : "unpexepected 
error")
+        }
+      };
+    }
+  };
+
+  async function refreshLoginToken(
+    baseUrl: string,
+    token: LoginToken
+  ): Promise<LoginResult> {
+
+    if 
(AbsoluteTime.isExpired(AbsoluteTime.fromProtocolTimestamp(token.expiration))) {
+      return {
+        valid: false, cause: {
+          type: ErrorType.CLIENT,
+          status: HttpStatusCode.Unauthorized,
+          message: "login token expired, login again.",
+          info: {
+            hasToken: true,
+            status: 401,
+            options: {},
+            url: `/private/token`,
+            payload: {}
+          },
+          payload: {}
+        },
+      }
+    }
+
+    return requestNewLoginToken(baseUrl, token.token as AccessToken)
+  }
+  return { requestNewLoginToken, refreshLoginToken }
+}
+
+export interface LoginToken {
+  token: string,
+  expiration: Timestamp,
+}
+// token used to get loginToken
+// must forget after used
+declare const __ac_token: unique symbol;
+export type AccessToken = string & {
+  [__ac_token]: true;
+};
+
+type YesOrNo = "yes" | "no";
+export type LoginResult = {
+  valid: true;
+  token: string;
+  expiration: Timestamp;
+} | {
+  valid: false;
+  cause: HttpError<{}>;
+}
+
+
+//   DELETE /private/instances/$INSTANCE
+export interface LoginTokenRequest {
+  // Scope of the token (which kinds of operations it will allow)
+  scope: "readonly" | "write";
+
+  // Server may impose its own upper bound
+  // on the token validity duration
+  duration?: RelativeTime;
+
+  // Can this token be refreshed?
+  // Defaults to false.
+  refreshable?: boolean;
+}
+export interface LoginTokenSuccessResponse {
+  // The login token that can be used to access resources
+  // that are in scope for some time. Must be prefixed
+  // with "Bearer " when used in the "Authorization" HTTP header.
+  // Will already begin with the RFC 8959 prefix.
+  token: string;
+
+  // Scope of the token (which kinds of operations it will allow)
+  scope: "readonly" | "write";
+
+  // Server may impose its own upper bound
+  // on the token validity duration
+  expiration: Timestamp;
+
+  // Can this token be refreshed?
+  refreshable: boolean;
+}
diff --git a/packages/demobank-ui/src/pages/LoginForm.tsx 
b/packages/demobank-ui/src/pages/LoginForm.tsx
index 46039005a..f6ea0e1d1 100644
--- a/packages/demobank-ui/src/pages/LoginForm.tsx
+++ b/packages/demobank-ui/src/pages/LoginForm.tsx
@@ -19,11 +19,12 @@ import { ErrorType, notifyError, useTranslationContext } 
from "@gnu-taler/web-ut
 import { Fragment, VNode, h } from "preact";
 import { useEffect, useRef, useState } from "preact/hooks";
 import { useBackendContext } from "../context/backend.js";
-import { useCredentialsChecker } from "../hooks/backend.js";
 import { bankUiSettings } from "../settings.js";
 import { undefinedIfEmpty } from "../utils.js";
 import { USERNAME_REGEX } from "./RegistrationPage.js";
 import { ShowInputErrorLabel } from "../components/ShowInputErrorLabel.js";
+import { AccessToken, useCredentialsChecker } from 
"../hooks/useCredentialsChecker.js";
+import { useCredentialsCheckerOld } from "../hooks/backend.js";
 
 /**
  * Collect and submit login data.
@@ -33,7 +34,9 @@ export function LoginForm({ onRegister }: { onRegister?: () 
=> void }): VNode {
   const [username, setUsername] = useState<string | undefined>();
   const [password, setPassword] = useState<string | undefined>();
   const { i18n } = useTranslationContext();
-  const testLogin = useCredentialsChecker();
+  // const { requestNewLoginToken, refreshLoginToken } = 
useCredentialsChecker();
+
+  const testLogin = useCredentialsCheckerOld();
   const ref = useRef<HTMLInputElement>(null);
   useEffect(function focusInput() {
     ref.current?.focus();

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