Add one-time token login flow and deep-link handling

components/Login.js

@@ -1,8 +1,8 @@
-import React, { useState } from 'react';
+import React, { useEffect, useRef, useState } from 'react';
 import { Text, View, StyleSheet, Image } from 'react-native';
 import { TextInput, Button, HelperText } from 'react-native-paper';
 import API from './../API.js';
-import { useNavigation } from '@react-navigation/native';
+import { useNavigation, useRoute } from '@react-navigation/native';
 import i18n from "../i18nMessages.js";
 
 
@@ -11,7 +11,12 @@ let LoginForm = () => {
   const [password, setPassword] = useState('');
   const [error, setError] = useState('');
   const [tries, setTries] = useState(0);
+  const [tokenLinkSending, setTokenLinkSending] = useState(false);
+  const [tokenLoginLoading, setTokenLoginLoading] = useState(false);
+  const [tokenLoginError, setTokenLoginError] = useState('');
   const navigation = useNavigation();
+  const route = useRoute();
+  const handledTokenRef = useRef('');
   const resetPasswordBol = tries > 2;
 
   const resetPassword = async () => {
@@ -40,6 +45,44 @@ let LoginForm = () => {
     //alert(i18n.t('message.wrongInformation'))
   };
 
+  const requestOneTimeLink = async () => {
+    if (!email.trim()) return;
+    setTokenLinkSending(true);
+    setTokenLoginError('');
+    try {
+      await API.resetPassword(email.trim());
+      alert("If this account exists, we sent a one-time sign-in link to your email.");
+    } finally {
+      setTokenLinkSending(false);
+    }
+  };
+
+  useEffect(() => {
+    const token = typeof route?.params?.token === "string" ? route.params.token.trim() : "";
+    if (!token) return;
+    if (handledTokenRef.current === token) return;
+    handledTokenRef.current = token;
+    let cancelled = false;
+    const consumeToken = async () => {
+      setTokenLoginLoading(true);
+      setTokenLoginError('');
+      const r = await API.logInWithPasswordToken(token);
+      if (cancelled) return;
+      setTokenLoginLoading(false);
+      if (r?.status === "ok") {
+        return navigation.reset({
+          index: 0,
+          routes: [{ name: 'MainNavigation' }],
+        });
+      }
+      setTokenLoginError(r?.status || "Invalid or expired token");
+    };
+    consumeToken();
+    return () => {
+      cancelled = true;
+    };
+  }, [route?.params?.token]);
+
   return (
     <View style={styles.mainView}>
       <TextInput
@@ -73,6 +116,12 @@ let LoginForm = () => {
       {error === 'incorrect password' ? <HelperText type="error" visible={true}>
         {i18n.t("message.reviewPassword")}
       </HelperText> : <></>}
+      {tokenLoginLoading ? <HelperText type="info" visible={true}>
+        Signing you in from email link...
+      </HelperText> : <></>}
+      {tokenLoginError ? <HelperText type="error" visible={true}>
+        {tokenLoginError}
+      </HelperText> : <></>}
       <View style={{ flexDirection: "row" }}>
         <Button
           style={styles.button}
@@ -93,6 +142,13 @@ let LoginForm = () => {
           </Button> : <></>
         }
       </View>
+      <Button
+        style={styles.button}
+        disabled={!email.trim() || tokenLinkSending}
+        onPress={requestOneTimeLink}
+      >
+        {tokenLinkSending ? "Sending..." : "Email me a one-time sign-in link"}
+      </Button>
     </View>
   );
 }