set up API for donations

app/javascript/mastodon/features/donate/api.ts

@@ -0,0 +1,88 @@
+import { useEffect, useState } from 'react';
+
+import initialState from '@/mastodon/initial_state';
+
+// TODO: Proxy this through at least an env var.
+const API_URL = 'https://api.joinmastodon.org/v1/donations/campaigns/active';
+
+export const DONATION_FREQUENCIES = ['one_time', 'monthly', 'yearly'] as const;
+export type DonationFrequency = (typeof DONATION_FREQUENCIES)[number];
+
+export const LOCALE = initialState?.meta.locale ?? 'en';
+
+export function useDonateApi() {
+  const [response, setResponse] = useState<DonateServerResponse | null>(null);
+
+  const [seed, setSeed] = useState(0);
+  useEffect(() => {
+    try {
+      const storedSeed = localStorage.getItem('donate_seed');
+      if (storedSeed) {
+        setSeed(Number.parseInt(storedSeed, 10));
+        return;
+      }
+      const newSeed = Math.floor(Math.random() * 99) + 1;
+      localStorage.setItem('donate_seed', newSeed.toString());
+      setSeed(newSeed);
+    } catch {
+      // No local storage available, just set a seed for this session.
+      setSeed(Math.floor(Math.random() * 99) + 1);
+    }
+  }, []);
+
+  useEffect(() => {
+    if (!seed) {
+      return;
+    }
+    fetchCampaign({ locale: LOCALE, seed, source: 'web' })
+      .then((res) => {
+        setResponse(res);
+      })
+      .catch((reason: unknown) => {
+        console.warn('Error fetching donation campaign:', reason);
+      });
+  }, [seed]);
+
+  return response;
+}
+
+export interface DonateServerResponse {
+  id: string;
+  amounts: Record<DonationFrequency, DonateAmount>;
+  donation_url: string;
+  banner_message: string;
+  banner_button_text: string;
+  donation_message: string;
+  donation_button_text: string;
+  donation_success_post: string;
+  default_currency: string;
+}
+
+type DonateAmount = Record<string, number[]>;
+
+async function fetchCampaign(
+  params: DonateServerRequest,
+): Promise<DonateServerResponse | null> {
+  // Create the URL with query parameters.
+  const url = new URL(API_URL);
+  for (const [key, value] of Object.entries(params)) {
+    // Check to make TS happy.
+    if (typeof value === 'string' || typeof value === 'number') {
+      url.searchParams.append(key, value.toString());
+    }
+  }
+  url.searchParams.append('platform', 'web');
+
+  const response = await fetch(url);
+  if (!response.ok) {
+    return null;
+  }
+  return response.json() as Promise<DonateServerResponse>;
+}
+
+interface DonateServerRequest {
+  locale: string;
+  seed: number;
+  source: string;
+  return_url?: string;
+}

app/javascript/mastodon/features/donate/donate_modal.scss

@@ -3,16 +3,21 @@
     gap: 1rem;
   }
 
-  .row {
-    display: flex;
-    gap: 1rem;
-  }
-
   header {
     padding: 24px 24px 0;
     align-items: start;
   }
 
+  form {
+    min-height: 200px;
+    position: relative;
+  }
+
+  .row {
+    display: flex;
+    gap: 1rem;
+  }
+
   .row--select {
     gap: 0;
     width: 100%;

app/javascript/mastodon/features/donate/donate_modal.tsx

@@ -1,5 +1,5 @@
 import type { FC, SyntheticEvent } from 'react';
-import { forwardRef, useCallback, useState } from 'react';
+import { forwardRef, useCallback, useMemo, useState } from 'react';
 
 import { defineMessages, useIntl } from 'react-intl';
 
@@ -10,72 +10,27 @@ import { Button } from '@/mastodon/components/button';
 import { Dropdown } from '@/mastodon/components/dropdown';
 import type { SelectItem } from '@/mastodon/components/dropdown_selector';
 import { IconButton } from '@/mastodon/components/icon_button';
+import { LoadingIndicator } from '@/mastodon/components/loading_indicator';
 import CloseIcon from '@/material-icons/400-24px/close.svg?react';
 import ExternalLinkIcon from '@/material-icons/400-24px/open_in_new.svg?react';
 
 import './donate_modal.scss';
+import type { DonateServerResponse, DonationFrequency } from './api';
+import { useDonateApi } from './api';
 
 interface DonateModalProps {
   onClose: () => void;
 }
 
-type Frequency = 'one_time' | 'monthly';
-
 const messages = defineMessages({
   close: { id: 'lightbox.close', defaultMessage: 'Close' },
 });
 
-const currencyOptions = [
-  {
-    value: 'usd',
-    text: 'USD',
-  },
-  {
-    value: 'eur',
-    text: 'EUR',
-  },
-] as const satisfies SelectItem[];
-type Currency = (typeof currencyOptions)[number]['value'];
-function isCurrency(value: string): value is Currency {
-  return currencyOptions.some((option) => option.value === value);
-}
-
-const amountOptions = [
-  { value: '2000', text: '€20' },
-  { value: '1000', text: '€10' },
-  { value: '500', text: '€5' },
-  { value: '300', text: '€3' },
-] as const satisfies SelectItem[];
-
 // eslint-disable-next-line @typescript-eslint/no-unused-vars -- React throws a warning if not set.
 const DonateModal: FC<DonateModalProps> = forwardRef(({ onClose }, ref) => {
   const intl = useIntl();
 
-  const [frequency, setFrequency] = useState<Frequency>('one_time');
-  const handleFrequencyToggle = useCallback((value: Frequency) => {
-    return () => {
-      setFrequency(value);
-    };
-  }, []);
-
-  const [currency, setCurrency] = useState<Currency>('usd');
-  const handleCurrencyChange = useCallback((value: string) => {
-    if (isCurrency(value)) {
-      setCurrency(value);
-    }
-  }, []);
-
-  const [amount, setAmount] = useState(() =>
-    Number.parseInt(amountOptions[0].value),
-  );
-  const handleAmountChange = useCallback((event: SyntheticEvent) => {
-    if (
-      event.target instanceof HTMLButtonElement ||
-      event.target instanceof HTMLInputElement
-    ) {
-      setAmount(Number.parseInt(event.target.value));
-    }
-  }, []);
+  const donationData = useDonateApi();
 
   return (
     <div className='modal-root__modal dialog-modal donate_modal'>
@@ -93,7 +48,67 @@ const DonateModal: FC<DonateModalProps> = forwardRef(({ onClose }, ref) => {
             onClick={onClose}
           />
         </header>
-        <div className='dialog-modal__content__form'>
+        <form
+          className={classNames('dialog-modal__content__form', {
+            loading: !donationData,
+          })}
+        >
+          {!donationData ? (
+            <LoadingIndicator />
+          ) : (
+            <DonateForm data={donationData} />
+          )}
+        </form>
+      </div>
+    </div>
+  );
+});
+DonateModal.displayName = 'DonateModal';
+
+const DonateForm: FC<{ data: DonateServerResponse }> = ({ data }) => {
+  const [frequency, setFrequency] = useState<DonationFrequency>('one_time');
+  const handleFrequencyToggle = useCallback((value: DonationFrequency) => {
+    return () => {
+      setFrequency(value);
+    };
+  }, []);
+
+  const [currency, setCurrency] = useState<string>(data.default_currency);
+  const currencyOptions: SelectItem[] = useMemo(
+    () =>
+      Object.keys(data.amounts.one_time).map((code) => ({
+        value: code,
+        text: code,
+      })),
+    [data.amounts],
+  );
+
+  const [amount, setAmount] = useState(
+    () => data.amounts[frequency][data.default_currency]?.[0] ?? 'EUR',
+  );
+  const handleAmountChange = useCallback((event: SyntheticEvent) => {
+    if (
+      event.target instanceof HTMLButtonElement ||
+      event.target instanceof HTMLInputElement
+    ) {
+      setAmount(Number.parseInt(event.target.value));
+    }
+  }, []);
+  const amountOptions: SelectItem[] = useMemo(() => {
+    const formatter = new Intl.NumberFormat('en', {
+      style: 'currency',
+      currency,
+    });
+    return Object.values(data.amounts[frequency][currency] ?? {}).map(
+      (value) => ({
+        value: value.toString(),
+        text: formatter.format(value / 100),
+      }),
+    );
+  }, [currency, data.amounts, frequency]);
+
+  return (
+    <>
       <div className='row'>
         <ToggleButton
           active={frequency === 'one_time'}
@@ -114,7 +129,7 @@ const DonateModal: FC<DonateModalProps> = forwardRef(({ onClose }, ref) => {
           items={currencyOptions}
           current={currency}
           classPrefix='donate_modal'
-              onChange={handleCurrencyChange}
+          onChange={setCurrency}
         />
         <input
           type='number'
@@ -137,7 +152,7 @@ const DonateModal: FC<DonateModalProps> = forwardRef(({ onClose }, ref) => {
         ))}
       </div>
 
-          <Button className='submit' block>
+      <Button className='submit' block type='submit'>
         Continue to payment
         <ExternalLinkIcon />
       </Button>
@@ -145,12 +160,9 @@ const DonateModal: FC<DonateModalProps> = forwardRef(({ onClose }, ref) => {
       <p className='footer'>
         You will be redirected to joinmastodon.org for secure payment
       </p>
-        </div>
-      </div>
-    </div>
+    </>
   );
-});
-DonateModal.displayName = 'DonateModal';
+};
 
 const ToggleButton: FC<ButtonProps & { active: boolean }> = ({
   active,