Let users customize the preferred reaction palette

2021-09-09 11:29:01 -05:00 · 2021-09-09 11:29:01 -05:00 · f28456c160
commit f28456c160
parent 7a5385e00a
38 changed files with 1788 additions and 124 deletions
--- a/_locales/en/messages.json
+++ b/_locales/en/messages.json
@ -1244,7 +1244,11 @@
  },
  "save": {
    "message": "Save",
-    "description": "Used as a 'commit changes' button in the Caption Editor for outgoing image attachments"
+    "description": "Used on save buttons"
+  },
+  "reset": {
+    "message": "Reset",
+    "description": "Used on reset buttons"
  },
  "fileIconAlt": {
    "message": "File icon",
@ -6301,6 +6305,18 @@
      }
    }
  },
+  "CustomizingPreferredReactions__title": {
+    "message": "Customize default reactions",
+    "description": "Shown in the header of the modal for customizing the preferred reactions. Also shown in the tooltip for the button that opens this modal."
+  },
+  "CustomizingPreferredReactions__subtitle": {
+    "message": "Click to replace an emoji",
+    "description": "Instructions in the modal for customizing the preferred reactions."
+  },
+  "CustomizingPreferredReactions__had-save-error": {
+    "message": "There was an error when saving your settings. Please try again.",
+    "description": "Shown if there is an error when saving your preferred reaction settings. Should be very rare to see this message."
+  },
  "WhatsNew__modal-title": {
    "message": "What's New",
    "description": "Title for the whats new modal"
--- a/stylesheets/_modules.scss
+++ b/stylesheets/_modules.scss
@ -7439,6 +7439,19 @@ button.module-image__border-overlay:focus {
  &__footer {
    @extend %module-emoji-picker--ribbon;
    justify-content: center;
+
+    &__skin-tones {
+      align-items: center;
+      display: flex;
+      flex-direction: row;
+      flex-grow: 1;
+      justify-content: center;
+    }
+
+    &__settings-spacer {
+      width: 28px;
+      margin-right: 12px;
+    }
  }

  &__button {
@ -7457,8 +7470,43 @@ button.module-image__border-overlay:focus {
    }

    &--footer {
-      &:not(:first-of-type) {
-        margin-left: 4px;
+      &:not(:last-of-type) {
+        margin-right: 4px;
+      }
+    }
+
+    &--settings {
+      margin-left: 12px;
+      border-radius: 100%;
+
+      @include light-theme {
+        background: $color-white;
+        box-shadow: 0px 0px 4px $color-black-alpha-20;
+      }
+
+      @include dark-theme {
+        background: $color-gray-65;
+      }
+
+      &::before {
+        display: block;
+        width: 20px;
+        height: 20px;
+        content: '';
+
+        @include light-theme {
+          @include color-svg(
+            '../images/icons/v2/settings-outline-16.svg',
+            $color-gray-75
+          );
+        }
+
+        @include dark-theme {
+          @include color-svg(
+            '../images/icons/v2/settings-solid-16.svg',
+            $color-gray-25
+          );
+        }
      }
    }

--- a/stylesheets/components/CustomizingPreferredReactionsModal.scss
+++ b/stylesheets/components/CustomizingPreferredReactionsModal.scss
@ -0,0 +1,26 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+.module-CustomizingPreferredReactionsModal {
+  &__reaction-picker-wrapper {
+    @include font-subtitle;
+    align-items: center;
+    display: flex;
+    flex-direction: column;
+    justify-content: center;
+    padding: 4rem 0;
+    text-align: center;
+    user-select: none;
+
+    @include light-theme {
+      color: $color-gray-45;
+    }
+    @include dark-theme {
+      color: $color-gray-25;
+    }
+
+    .module-ReactionPicker {
+      margin-bottom: 2rem;
+    }
+  }
+}
--- a/stylesheets/components/ReactionPicker.scss
+++ b/stylesheets/components/ReactionPicker.scss
@ -9,6 +9,8 @@
  $emoji-size-from-component: 48px;
  $big-emoji-size: 42px;

+  $root-selector: &;
+
  @include rounded-corners;
  align-items: center;
  border-style: solid;
@ -19,7 +21,6 @@
  padding: 3px 7px;
  position: relative;
  user-select: none;
-  z-index: 2;

  @media (prefers-reduced-motion: no-preference) {
    animation: {
@ -48,31 +49,14 @@
    justify-content: center;
    position: relative;

-    @media (prefers-reduced-motion: no-preference) {
-      // Prevent animation jank
-      opacity: 0;
-
-      animation: {
-        name: module-ReactionPicker__button-appear;
-        duration: 400ms;
-        timing-function: $ease-out-expo;
-        fill-mode: forwards;
-        // This delay is a fallback in case there are more than the expected number of
-        //   buttons.
-        delay: #{$max-expected-buttons * 10ms};
-      }
-    }
-    @for $i from 0 through $max-expected-buttons {
-      &:nth-of-type(#{$i + 1}) {
-        animation-delay: #{$i * 10ms};
-      }
-    }
-
    &--emoji {
      $emoji-button-selector: &;

      height: $button-size;
      width: $button-size;
+      @media (prefers-reduced-motion: no-preference) {
+        transition: background 200ms $ease-out-expo;
+      }

      .module-emoji {
        transform: scale($button-content-size / $emoji-size-from-component);
@ -80,25 +64,6 @@
          transition: transform 400ms $ease-out-expo;
        }
      }
-
-      @mixin focused-emoji {
-        @media (prefers-reduced-motion: no-preference) {
-          .module-emoji {
-            transform: scale($big-emoji-size / $emoji-size-from-component)
-              translateY(-16px);
-          }
-        }
-      }
-
-      &:hover {
-        @include focused-emoji;
-      }
-
-      @include keyboard-mode {
-        &:focus {
-          @include focused-emoji;
-        }
-      }
    }

    &--more {
@ -117,6 +82,11 @@
        &:hover {
          background: $color-gray-05;
        }
+        @include keyboard-mode {
+          &:focus {
+            background: $color-gray-05;
+          }
+        }
      }

      @include dark-theme {
@ -125,6 +95,11 @@
        &:hover {
          background: $color-gray-45;
        }
+        @include dark-keyboard-mode {
+          &:focus {
+            background: $color-gray-45;
+          }
+        }
      }

      &__dot {
@ -146,14 +121,101 @@
        }
      }
    }
+  }

-    &--selected {
-      @include light-theme {
-        background: $color-black-alpha-20;
+  &--picker-style {
+    z-index: 2;
+
+    #{$root-selector}__button {
+      @media (prefers-reduced-motion: no-preference) {
+        // Prevent animation jank
+        opacity: 0;
+
+        animation: {
+          name: module-ReactionPicker__button-appear;
+          duration: 400ms;
+          timing-function: $ease-out-expo;
+          fill-mode: forwards;
+          // This delay is a fallback in case there are more than the expected number of
+          //   buttons.
+          delay: #{$max-expected-buttons * 10ms};
+        }
      }

-      @include dark-theme {
-        background: $color-white-alpha-20;
+      @for $i from 0 through $max-expected-buttons {
+        &:nth-of-type(#{$i + 1}) {
+          animation-delay: #{$i * 10ms};
+        }
+      }
+
+      &--emoji {
+        @mixin focus-or-hover-styles {
+          .module-emoji {
+            transform: scale($big-emoji-size / $emoji-size-from-component)
+              translateY(-16px);
+          }
+        }
+        &:hover {
+          @include focus-or-hover-styles;
+        }
+        @include keyboard-mode {
+          &:focus {
+            @include focus-or-hover-styles;
+          }
+        }
+      }
+
+      &--selected {
+        @include light-theme {
+          background: $color-black-alpha-20;
+        }
+
+        @include dark-theme {
+          background: $color-white-alpha-20;
+        }
+      }
+    }
+  }
+
+  &--menu-style {
+    #{$root-selector}__button {
+      $light-focus-or-hover-background: $color-black-alpha-20;
+      $dark-focus-or-hover-background: $color-white-alpha-40;
+
+      &:hover {
+        @include light-theme {
+          background: $light-focus-or-hover-background;
+        }
+        @include dark-theme {
+          background: $dark-focus-or-hover-background;
+        }
+      }
+      @include keyboard-mode {
+        &:focus {
+          background: $light-focus-or-hover-background;
+        }
+      }
+      @include dark-keyboard-mode {
+        &:focus {
+          background: $dark-focus-or-hover-background;
+        }
+      }
+
+      #{$root-selector}--something-selected {
+        opacity: 0.4;
+      }
+
+      &--selected {
+        opacity: 1;
+
+        .module-emoji {
+          transform: scale($big-emoji-size / $emoji-size-from-component);
+        }
+
+        @media (prefers-reduced-motion: no-preference) {
+          animation: module-ReactionPicker__button-selected 1s ease-in-out
+            infinite alternate;
+        }
      }
    }
  }
@ -180,3 +242,13 @@
    opacity: 1;
  }
 }
+
+@keyframes module-ReactionPicker__button-selected {
+  from {
+    transform: rotate(-8deg);
+  }
+
+  to {
+    transform: rotate(8deg);
+  }
+}
--- a/stylesheets/manifest.scss
+++ b/stylesheets/manifest.scss
@ -51,6 +51,7 @@
@import './components/ContactSpoofingReviewDialogPerson.scss';
@import './components/ConversationHeader.scss';
@import './components/CustomColorEditor.scss';
+@import './components/CustomizingPreferredReactionsModal.scss';
@import './components/DisappearingTimeDialog.scss';
@import './components/DisappearingTimerSelect.scss';
@import './components/EditConversationAttributesModal.scss';
--- a/ts/background.ts
+++ b/ts/background.ts
@ -89,6 +89,7 @@ import {
  SendStatus,
 } from './messages/MessageSendState';
 import * as AttachmentDownloads from './messageModifiers/AttachmentDownloads';
+import * as preferredReactions from './state/ducks/preferredReactions';
 import * as Stickers from './types/Stickers';
 import { SignalService as Proto } from './protobuf';
 import { onRetryRequest, onDecryptionError } from './util/handleRetry';
@ -953,6 +954,7 @@ export async function startApp(): Promise<void> {
      },
      emojis: window.Signal.Emojis.getInitialState(),
      items: window.storage.getItemsState(),
+      preferredReactions: preferredReactions.getInitialState(),
      stickers: Stickers.getInitialState(),
      user: {
        attachmentsPath: window.baseAttachmentsPath,
--- a/ts/components/App.tsx
+++ b/ts/components/App.tsx
@ -24,8 +24,10 @@ export const App = ({
  conversationsStoppingMessageSendBecauseOfVerification,
  hasInitialLoadCompleted,
  i18n,
+  isCustomizingPreferredReactions,
  numberOfMessagesPendingBecauseOfVerification,
  renderCallManager,
+  renderCustomizingPreferredReactionsModal,
  renderGlobalModalContainer,
  renderSafetyNumber,
  theme,
@ -48,9 +50,13 @@ export const App = ({
        }
        hasInitialLoadCompleted={hasInitialLoadCompleted}
        i18n={i18n}
+        isCustomizingPreferredReactions={isCustomizingPreferredReactions}
        numberOfMessagesPendingBecauseOfVerification={
          numberOfMessagesPendingBecauseOfVerification
        }
+        renderCustomizingPreferredReactionsModal={
+          renderCustomizingPreferredReactionsModal
+        }
        renderSafetyNumber={renderSafetyNumber}
        verifyConversationsStoppingMessageSend={
          verifyConversationsStoppingMessageSend
--- a/ts/components/CustomizingPreferredReactionsModal.stories.tsx
+++ b/ts/components/CustomizingPreferredReactionsModal.stories.tsx
@ -0,0 +1,71 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import React, { ComponentProps } from 'react';
+
+import { storiesOf } from '@storybook/react';
+import { action } from '@storybook/addon-actions';
+import { setup as setupI18n } from '../../js/modules/i18n';
+import enMessages from '../../_locales/en/messages.json';
+
+import { CustomizingPreferredReactionsModal } from './CustomizingPreferredReactionsModal';
+
+const i18n = setupI18n('en', enMessages);
+const story = storiesOf(
+  'Components/CustomizingPreferredReactionsModal',
+  module
+);
+
+const defaultProps: ComponentProps<
+  typeof CustomizingPreferredReactionsModal
+> = {
+  cancelCustomizePreferredReactionsModal: action(
+    'cancelCustomizePreferredReactionsModal'
+  ),
+  deselectDraftEmoji: action('deselectDraftEmoji'),
+  draftPreferredReactions: [
+    'sparkles',
+    'sparkle',
+    'sparkler',
+    'shark',
+    'sparkling_heart',
+    'thumbsup',
+  ],
+  hadSaveError: false,
+  i18n,
+  isSaving: false,
+  onSetSkinTone: action('onSetSkinTone'),
+  originalPreferredReactions: [
+    'heart',
+    'thumbsup',
+    'thumbsdown',
+    'joy',
+    'open_mouth',
+    'cry',
+  ],
+  replaceSelectedDraftEmoji: action('replaceSelectedDraftEmoji'),
+  resetDraftEmoji: action('resetDraftEmoji'),
+  savePreferredReactions: action('savePreferredReactions'),
+  selectDraftEmojiToBeReplaced: action('selectDraftEmojiToBeReplaced'),
+  selectedDraftEmojiIndex: undefined,
+  skinTone: 4,
+};
+
+story.add('Default', () => (
+  <CustomizingPreferredReactionsModal {...defaultProps} />
+));
+
+story.add('Draft emoji selected', () => (
+  <CustomizingPreferredReactionsModal
+    {...defaultProps}
+    selectedDraftEmojiIndex={4}
+  />
+));
+
+story.add('Saving', () => (
+  <CustomizingPreferredReactionsModal {...defaultProps} isSaving />
+));
+
+story.add('Had error', () => (
+  <CustomizingPreferredReactionsModal {...defaultProps} hadSaveError />
+));
--- a/ts/components/CustomizingPreferredReactionsModal.tsx
+++ b/ts/components/CustomizingPreferredReactionsModal.tsx
@ -0,0 +1,193 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import React, { useEffect, useState } from 'react';
+import { usePopper } from 'react-popper';
+import { isEqual, noop } from 'lodash';
+
+import type { LocalizerType } from '../types/Util';
+import { Modal } from './Modal';
+import { Button, ButtonVariant } from './Button';
+import {
+  ReactionPicker,
+  ReactionPickerSelectionStyle,
+} from './conversation/ReactionPicker';
+import { EmojiPicker } from './emoji/EmojiPicker';
+import { convertShortName } from './emoji/lib';
+import { DEFAULT_PREFERRED_REACTION_EMOJI } from '../reactions/constants';
+import { offsetDistanceModifier } from '../util/popperUtil';
+
+type PropsType = {
+  draftPreferredReactions: Array<string>;
+  hadSaveError: boolean;
+  i18n: LocalizerType;
+  isSaving: boolean;
+  originalPreferredReactions: Array<string>;
+  selectedDraftEmojiIndex: undefined | number;
+  skinTone: number;
+
+  cancelCustomizePreferredReactionsModal(): unknown;
+  deselectDraftEmoji(): unknown;
+  onSetSkinTone(tone: number): unknown;
+  replaceSelectedDraftEmoji(newEmoji: string): unknown;
+  resetDraftEmoji(): unknown;
+  savePreferredReactions(): unknown;
+  selectDraftEmojiToBeReplaced(index: number): unknown;
+};
+
+export function CustomizingPreferredReactionsModal({
+  cancelCustomizePreferredReactionsModal,
+  deselectDraftEmoji,
+  draftPreferredReactions,
+  hadSaveError,
+  i18n,
+  isSaving,
+  onSetSkinTone,
+  originalPreferredReactions,
+  replaceSelectedDraftEmoji,
+  resetDraftEmoji,
+  savePreferredReactions,
+  selectDraftEmojiToBeReplaced,
+  selectedDraftEmojiIndex,
+  skinTone,
+}: Readonly<PropsType>): JSX.Element {
+  const [
+    referenceElement,
+    setReferenceElement,
+  ] = useState<null | HTMLDivElement>(null);
+  const [popperElement, setPopperElement] = useState<null | HTMLDivElement>(
+    null
+  );
+  const emojiPickerPopper = usePopper(referenceElement, popperElement, {
+    placement: 'bottom',
+    modifiers: [
+      offsetDistanceModifier(8),
+      {
+        name: 'preventOverflow',
+        options: { altAxis: true },
+      },
+    ],
+  });
+
+  const isSomethingSelected = selectedDraftEmojiIndex !== undefined;
+
+  useEffect(() => {
+    if (!isSomethingSelected) {
+      return noop;
+    }
+
+    const onBodyClick = (event: MouseEvent) => {
+      const { target } = event;
+      if (!(target instanceof HTMLElement) || !popperElement) {
+        return;
+      }
+
+      const isClickOutsidePicker = !popperElement.contains(target);
+      if (isClickOutsidePicker) {
+        deselectDraftEmoji();
+      }
+    };
+
+    document.body.addEventListener('click', onBodyClick);
+    return () => {
+      document.body.removeEventListener('click', onBodyClick);
+    };
+  }, [isSomethingSelected, popperElement, deselectDraftEmoji]);
+
+  const emojis = draftPreferredReactions.map(shortName =>
+    convertShortName(shortName, skinTone)
+  );
+
+  const selected =
+    typeof selectedDraftEmojiIndex === 'number'
+      ? emojis[selectedDraftEmojiIndex]
+      : undefined;
+
+  const onPick = isSaving
+    ? noop
+    : (pickedEmoji: string) => {
+        selectDraftEmojiToBeReplaced(
+          emojis.findIndex(emoji => emoji === pickedEmoji)
+        );
+      };
+
+  const hasChanged = !isEqual(
+    originalPreferredReactions,
+    draftPreferredReactions
+  );
+  const canReset =
+    !isSaving &&
+    !isEqual(DEFAULT_PREFERRED_REACTION_EMOJI, draftPreferredReactions);
+  const canSave = !isSaving && hasChanged;
+
+  return (
+    <Modal
+      hasXButton
+      i18n={i18n}
+      onClose={() => {
+        cancelCustomizePreferredReactionsModal();
+      }}
+      title={i18n('CustomizingPreferredReactions__title')}
+    >
+      <div className="module-CustomizingPreferredReactionsModal__reaction-picker-wrapper">
+        <ReactionPicker
+          hasMoreButton={false}
+          i18n={i18n}
+          onPick={onPick}
+          ref={setReferenceElement}
+          preferredReactionEmoji={draftPreferredReactions}
+          selected={selected}
+          selectionStyle={ReactionPickerSelectionStyle.Menu}
+          renderEmojiPicker={shouldNotBeCalled}
+          skinTone={skinTone}
+        />
+        {hadSaveError
+          ? i18n('CustomizingPreferredReactions__had-save-error')
+          : i18n('CustomizingPreferredReactions__subtitle')}
+      </div>
+      {isSomethingSelected && (
+        <div
+          className="module-CustomizingPreferredReactionsModal__emoji-picker-wrapper"
+          ref={setPopperElement}
+          style={emojiPickerPopper.styles.popper}
+          {...emojiPickerPopper.attributes.popper}
+        >
+          <EmojiPicker
+            i18n={i18n}
+            onPickEmoji={({ shortName }) => {
+              replaceSelectedDraftEmoji(shortName);
+            }}
+            skinTone={skinTone}
+            onSetSkinTone={onSetSkinTone}
+            onClose={() => {
+              deselectDraftEmoji();
+            }}
+          />
+        </div>
+      )}
+      <Modal.ButtonFooter>
+        <Button
+          disabled={!canReset}
+          onClick={() => {
+            resetDraftEmoji();
+          }}
+          variant={ButtonVariant.SecondaryAffirmative}
+        >
+          {i18n('reset')}
+        </Button>
+        <Button
+          disabled={!canSave}
+          onClick={() => {
+            savePreferredReactions();
+          }}
+        >
+          {i18n('save')}
+        </Button>
+      </Modal.ButtonFooter>
+    </Modal>
+  );
+}
+
+function shouldNotBeCalled(): React.ReactElement {
+  throw new Error('This should not be called');
+}
--- a/ts/components/Inbox.tsx
+++ b/ts/components/Inbox.tsx
@ -24,7 +24,9 @@ export type PropsType = {
  conversationsStoppingMessageSendBecauseOfVerification: Array<ConversationType>;
  hasInitialLoadCompleted: boolean;
  i18n: LocalizerType;
+  isCustomizingPreferredReactions: boolean;
  numberOfMessagesPendingBecauseOfVerification: number;
+  renderCustomizingPreferredReactionsModal: () => JSX.Element;
  renderSafetyNumber: (props: SafetyNumberProps) => JSX.Element;
  verifyConversationsStoppingMessageSend: () => void;
 };
@ -34,7 +36,9 @@ export const Inbox = ({
  conversationsStoppingMessageSendBecauseOfVerification,
  hasInitialLoadCompleted,
  i18n,
+  isCustomizingPreferredReactions,
  numberOfMessagesPendingBecauseOfVerification,
+  renderCustomizingPreferredReactionsModal,
  renderSafetyNumber,
  verifyConversationsStoppingMessageSend,
 }: PropsType): JSX.Element => {
@ -67,7 +71,7 @@ export const Inbox = ({
    }
  }, [hasInitialLoadCompleted, viewRef]);

-  let safetyNumberChangeDialog: ReactNode;
+  let activeModal: ReactNode;
  if (conversationsStoppingMessageSendBecauseOfVerification.length) {
    const confirmText: string =
      numberOfMessagesPendingBecauseOfVerification === 1
@ -75,7 +79,7 @@ export const Inbox = ({
        : i18n('safetyNumberChangeDialog__pending-messages--many', [
            numberOfMessagesPendingBecauseOfVerification.toString(),
          ]);
-    safetyNumberChangeDialog = (
+    activeModal = (
      <SafetyNumberChangeDialog
        confirmText={confirmText}
        contacts={conversationsStoppingMessageSendBecauseOfVerification}
@ -86,11 +90,14 @@ export const Inbox = ({
      />
    );
  }
+  if (!activeModal && isCustomizingPreferredReactions) {
+    activeModal = renderCustomizingPreferredReactionsModal();
+  }

  return (
    <>
      <div className="inbox index" ref={hostRef} />
-      {safetyNumberChangeDialog}
+      {activeModal}
    </>
  );
 };
--- a/ts/components/conversation/ReactionPicker.stories.tsx
+++ b/ts/components/conversation/ReactionPicker.stories.tsx
@ -1,4 +1,4 @@
-// Copyright 2020 Signal Messenger, LLC
+// Copyright 2020-2021 Signal Messenger, LLC
 // SPDX-License-Identifier: AGPL-3.0-only

 import * as React from 'react';
@ -9,11 +9,24 @@ import { action } from '@storybook/addon-actions';
 import { select } from '@storybook/addon-knobs';
 import { setup as setupI18n } from '../../../js/modules/i18n';
 import enMessages from '../../../_locales/en/messages.json';
-import { Props as ReactionPickerProps, ReactionPicker } from './ReactionPicker';
+import {
+  Props as ReactionPickerProps,
+  ReactionPicker,
+  ReactionPickerSelectionStyle,
+} from './ReactionPicker';
 import { EmojiPicker } from '../emoji/EmojiPicker';

 const i18n = setupI18n('en', enMessages);

+const preferredReactionEmoji = [
+  'heart',
+  'thumbsup',
+  'thumbsdown',
+  'joy',
+  'open_mouth',
+  'cry',
+];
+
 const renderEmojiPicker: ReactionPickerProps['renderEmojiPicker'] = ({
  onClose,
  onPickEmoji,
@ -35,7 +48,12 @@ storiesOf('Components/Conversation/ReactionPicker', module)
      <ReactionPicker
        i18n={i18n}
        onPick={action('onPick')}
+        openCustomizePreferredReactionsModal={action(
+          'openCustomizePreferredReactionsModal'
+        )}
+        preferredReactionEmoji={preferredReactionEmoji}
        renderEmojiPicker={renderEmojiPicker}
+        selectionStyle={ReactionPickerSelectionStyle.Picker}
        skinTone={0}
      />
    );
@ -47,7 +65,12 @@ storiesOf('Components/Conversation/ReactionPicker', module)
          i18n={i18n}
          selected={e}
          onPick={action('onPick')}
+          openCustomizePreferredReactionsModal={action(
+            'openCustomizePreferredReactionsModal'
+          )}
+          preferredReactionEmoji={preferredReactionEmoji}
          renderEmojiPicker={renderEmojiPicker}
+          selectionStyle={ReactionPickerSelectionStyle.Picker}
          skinTone={0}
        />
      </div>
@ -60,7 +83,12 @@ storiesOf('Components/Conversation/ReactionPicker', module)
          i18n={i18n}
          selected={e}
          onPick={action('onPick')}
+          openCustomizePreferredReactionsModal={action(
+            'openCustomizePreferredReactionsModal'
+          )}
+          preferredReactionEmoji={preferredReactionEmoji}
          renderEmojiPicker={renderEmojiPicker}
+          selectionStyle={ReactionPickerSelectionStyle.Picker}
          skinTone={select(
            'skinTone',
            { 0: 0, 1: 1, 2: 2, 3: 3, 4: 4, 5: 5 },
--- a/ts/components/conversation/ReactionPicker.tsx
+++ b/ts/components/conversation/ReactionPicker.tsx
@ -1,39 +1,41 @@
-// Copyright 2020 Signal Messenger, LLC
+// Copyright 2020-2021 Signal Messenger, LLC
 // SPDX-License-Identifier: AGPL-3.0-only

 import * as React from 'react';
 import classNames from 'classnames';
+import * as log from '../../logging/log';
 import { Emoji } from '../emoji/Emoji';
 import { convertShortName } from '../emoji/lib';
 import { Props as EmojiPickerProps } from '../emoji/EmojiPicker';
+import { missingCaseError } from '../../util/missingCaseError';
 import { useRestoreFocus } from '../../util/hooks/useRestoreFocus';
 import { LocalizerType } from '../../types/Util';

+export enum ReactionPickerSelectionStyle {
+  Picker,
+  Menu,
+}
+
 export type RenderEmojiPickerProps = Pick<Props, 'onClose' | 'style'> &
-  Pick<EmojiPickerProps, 'onPickEmoji'> & {
+  Pick<EmojiPickerProps, 'onClickSettings' | 'onPickEmoji'> & {
    ref: React.Ref<HTMLDivElement>;
  };

 export type OwnProps = {
+  hasMoreButton?: boolean;
  i18n: LocalizerType;
  selected?: string;
+  selectionStyle: ReactionPickerSelectionStyle;
  onClose?: () => unknown;
  onPick: (emoji: string) => unknown;
+  openCustomizePreferredReactionsModal?: () => unknown;
+  preferredReactionEmoji: Array<string>;
  renderEmojiPicker: (props: RenderEmojiPickerProps) => React.ReactElement;
  skinTone: number;
 };

 export type Props = OwnProps & Pick<React.HTMLProps<HTMLDivElement>, 'style'>;

-const DEFAULT_EMOJI_LIST = [
-  'heart',
-  'thumbsup',
-  'thumbsdown',
-  'joy',
-  'open_mouth',
-  'cry',
-];
-
 const EmojiButton = React.forwardRef<
  HTMLButtonElement,
  {
@ -64,7 +66,19 @@ const EmojiButton = React.forwardRef<

 export const ReactionPicker = React.forwardRef<HTMLDivElement, Props>(
  (
-    { i18n, selected, onClose, skinTone, onPick, renderEmojiPicker, style },
+    {
+      hasMoreButton = true,
+      i18n,
+      onClose,
+      onPick,
+      openCustomizePreferredReactionsModal,
+      preferredReactionEmoji,
+      renderEmojiPicker,
+      selected,
+      selectionStyle,
+      skinTone,
+      style,
+    },
    ref
  ) => {
    const [pickingOther, setPickingOther] = React.useState(false);
@ -96,17 +110,25 @@ export const ReactionPicker = React.forwardRef<HTMLDivElement, Props>(
    const [focusRef] = useRestoreFocus();

    if (pickingOther) {
-      return renderEmojiPicker({ onPickEmoji, onClose, style, ref });
+      return renderEmojiPicker({
+        onClickSettings: openCustomizePreferredReactionsModal,
+        onClose,
+        onPickEmoji,
+        ref,
+        style,
+      });
    }

-    const emojis = DEFAULT_EMOJI_LIST.map(shortName =>
+    const emojis = preferredReactionEmoji.map(shortName =>
      convertShortName(shortName, skinTone)
    );

    const otherSelected = selected && !emojis.includes(selected);

    let moreButton: React.ReactNode;
-    if (otherSelected) {
+    if (!hasMoreButton) {
+      moreButton = undefined;
+    } else if (otherSelected) {
      moreButton = (
        <EmojiButton
          emoji={selected}
@ -137,8 +159,30 @@ export const ReactionPicker = React.forwardRef<HTMLDivElement, Props>(
      );
    }

+    let selectionStyleClassName: string;
+    switch (selectionStyle) {
+      case ReactionPickerSelectionStyle.Picker:
+        selectionStyleClassName = 'module-ReactionPicker--picker-style';
+        break;
+      case ReactionPickerSelectionStyle.Menu:
+        selectionStyleClassName = 'module-ReactionPicker--menu-style';
+        break;
+      default:
+        log.error(missingCaseError(selectionStyle));
+        selectionStyleClassName = 'module-ReactionPicker--picker-style';
+        break;
+    }
+
    return (
-      <div ref={ref} style={style} className="module-ReactionPicker">
+      <div
+        ref={ref}
+        style={style}
+        className={classNames(
+          'module-ReactionPicker',
+          selectionStyleClassName,
+          selected ? 'module-ReactionPicker--something-selected' : undefined
+        )}
+      >
        {emojis.map((emoji, index) => {
          const maybeFocusRef = index === 0 ? focusRef : undefined;

--- a/ts/components/emoji/EmojiPicker.stories.tsx
+++ b/ts/components/emoji/EmojiPicker.stories.tsx
@ -1,4 +1,4 @@
-// Copyright 2020 Signal Messenger, LLC
+// Copyright 2020-2021 Signal Messenger, LLC
 // SPDX-License-Identifier: AGPL-3.0-only

 import * as React from 'react';
@ -70,4 +70,17 @@ storiesOf('Components/Emoji/EmojiPicker', module)
        recentEmojis={[]}
      />
    );
+  })
+  .add('With settings button', () => {
+    return (
+      <EmojiPicker
+        i18n={i18n}
+        onPickEmoji={action('onPickEmoji')}
+        onSetSkinTone={action('onSetSkinTone')}
+        onClickSettings={action('onClickSettings')}
+        onClose={action('onClose')}
+        skinTone={0}
+        recentEmojis={[]}
+      />
+    );
  });
--- a/ts/components/emoji/EmojiPicker.tsx
+++ b/ts/components/emoji/EmojiPicker.tsx
@ -1,4 +1,4 @@
-// Copyright 2019-2020 Signal Messenger, LLC
+// Copyright 2019-2021 Signal Messenger, LLC
 // SPDX-License-Identifier: AGPL-3.0-only

 import * as React from 'react';
@ -34,6 +34,7 @@ export type OwnProps = {
  readonly skinTone?: number;
  readonly onSetSkinTone?: (tone: number) => unknown;
  readonly recentEmojis?: Array<string>;
+  readonly onClickSettings?: () => unknown;
  readonly onClose?: () => unknown;
 };

@ -70,6 +71,7 @@ export const EmojiPicker = React.memo(
        onSetSkinTone,
        recentEmojis = [],
        style,
+        onClickSettings,
        onClose,
      }: Props,
      ref
@ -383,24 +385,38 @@ export const EmojiPicker = React.memo(
            </div>
          )}
          <footer className="module-emoji-picker__footer">
-            {[0, 1, 2, 3, 4, 5].map(tone => (
+            {Boolean(onClickSettings) && (
              <button
+                aria-label={i18n('CustomizingPreferredReactions__title')}
+                className="module-emoji-picker__button module-emoji-picker__button--footer module-emoji-picker__button--settings"
+                onClick={onClickSettings}
+                title={i18n('CustomizingPreferredReactions__title')}
                type="button"
-                key={tone}
-                data-tone={tone}
-                onClick={handlePickTone}
-                title={i18n('EmojiPicker--skin-tone', [`${tone}`])}
-                className={classNames(
-                  'module-emoji-picker__button',
-                  'module-emoji-picker__button--footer',
-                  selectedTone === tone
-                    ? 'module-emoji-picker__button--selected'
-                    : null
-                )}
-              >
-                <Emoji shortName="hand" skinTone={tone} size={20} />
-              </button>
-            ))}
+              />
+            )}
+            <div className="module-emoji-picker__footer__skin-tones">
+              {[0, 1, 2, 3, 4, 5].map(tone => (
+                <button
+                  type="button"
+                  key={tone}
+                  data-tone={tone}
+                  onClick={handlePickTone}
+                  title={i18n('EmojiPicker--skin-tone', [`${tone}`])}
+                  className={classNames(
+                    'module-emoji-picker__button',
+                    'module-emoji-picker__button--footer',
+                    selectedTone === tone
+                      ? 'module-emoji-picker__button--selected'
+                      : null
+                  )}
+                >
+                  <Emoji shortName="hand" skinTone={tone} size={20} />
+                </button>
+              ))}
+            </div>
+            {Boolean(onClickSettings) && (
+              <div className="module-emoji-picker__footer__settings-spacer" />
+            )}
          </footer>
        </div>
      );
--- a/ts/reactions/constants.ts
+++ b/ts/reactions/constants.ts
@ -0,0 +1,11 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+export const DEFAULT_PREFERRED_REACTION_EMOJI = [
+  'heart',
+  'thumbsup',
+  'thumbsdown',
+  'joy',
+  'open_mouth',
+  'cry',
+];
--- a/ts/reactions/getPreferredReactionEmoji.ts
+++ b/ts/reactions/getPreferredReactionEmoji.ts
@ -0,0 +1,20 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { DEFAULT_PREFERRED_REACTION_EMOJI } from './constants';
+import * as emoji from '../components/emoji/lib';
+
+const PREFERRED_REACTION_EMOJI_COUNT = DEFAULT_PREFERRED_REACTION_EMOJI.length;
+
+export function getPreferredReactionEmoji(storedValue: unknown): Array<string> {
+  const isStoredValueValid =
+    Array.isArray(storedValue) &&
+    storedValue.length === PREFERRED_REACTION_EMOJI_COUNT &&
+    storedValue.every(emoji.isShortName) &&
+    !hasDuplicates(storedValue);
+  return isStoredValueValid ? storedValue : DEFAULT_PREFERRED_REACTION_EMOJI;
+}
+
+function hasDuplicates(arr: ReadonlyArray<unknown>): boolean {
+  return new Set(arr).size !== arr.length;
+}
--- a/ts/state/ducks/items.ts
+++ b/ts/state/ducks/items.ts
@ -29,6 +29,8 @@ export type ItemsStateType = {
  readonly defaultConversationColor?: DefaultConversationColorType;

  readonly customColors?: CustomColorsItemType;
+
+  readonly preferredReactionEmoji?: Array<string>;
 };

 // Actions
--- a/ts/state/ducks/preferredReactions.ts
+++ b/ts/state/ducks/preferredReactions.ts
@ -0,0 +1,315 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { ThunkAction } from 'redux-thunk';
+import { omit } from 'lodash';
+import * as log from '../../logging/log';
+import * as Errors from '../../types/errors';
+import { replaceIndex } from '../../util/replaceIndex';
+import { useBoundActions } from '../../util/hooks';
+import type { StateType as RootStateType } from '../reducer';
+import { DEFAULT_PREFERRED_REACTION_EMOJI } from '../../reactions/constants';
+import { getPreferredReactionEmoji } from '../../reactions/getPreferredReactionEmoji';
+
+// State
+
+export type PreferredReactionsStateType = {
+  customizePreferredReactionsModal?: {
+    draftPreferredReactions: Array<string>;
+    originalPreferredReactions: Array<string>;
+    selectedDraftEmojiIndex: undefined | number;
+  } & (
+    | { isSaving: true; hadSaveError: false }
+    | { isSaving: false; hadSaveError: boolean }
+  );
+};
+
+// Actions
+
+const CANCEL_CUSTOMIZE_PREFERRED_REACTIONS_MODAL =
+  'preferredReactions/CANCEL_CUSTOMIZE_PREFERRED_REACTIONS_MODAL';
+const DESELECT_DRAFT_EMOJI = 'preferredReactions/DESELECT_DRAFT_EMOJI';
+const OPEN_CUSTOMIZE_PREFERRED_REACTIONS_MODAL =
+  'preferredReactions/OPEN_CUSTOMIZE_PREFERRED_REACTIONS_MODAL';
+const REPLACE_SELECTED_DRAFT_EMOJI =
+  'preferredReactions/REPLACE_SELECTED_DRAFT_EMOJI';
+const RESET_DRAFT_EMOJI = 'preferredReactions/RESET_DRAFT_EMOJI';
+const SAVE_PREFERRED_REACTIONS_FULFILLED =
+  'preferredReactions/SAVE_PREFERRED_REACTIONS_FULFILLED';
+const SAVE_PREFERRED_REACTIONS_PENDING =
+  'preferredReactions/SAVE_PREFERRED_REACTIONS_PENDING';
+const SAVE_PREFERRED_REACTIONS_REJECTED =
+  'preferredReactions/SAVE_PREFERRED_REACTIONS_REJECTED';
+const SELECT_DRAFT_EMOJI_TO_BE_REPLACED =
+  'preferredReactions/SELECT_DRAFT_EMOJI_TO_BE_REPLACED';
+
+type CancelCustomizePreferredReactionsModalActionType = {
+  type: typeof CANCEL_CUSTOMIZE_PREFERRED_REACTIONS_MODAL;
+};
+
+type DeselectDraftEmojiActionType = { type: typeof DESELECT_DRAFT_EMOJI };
+
+type OpenCustomizePreferredReactionsModalActionType = {
+  type: typeof OPEN_CUSTOMIZE_PREFERRED_REACTIONS_MODAL;
+  payload: {
+    originalPreferredReactions: Array<string>;
+  };
+};
+
+type ReplaceSelectedDraftEmojiActionType = {
+  type: typeof REPLACE_SELECTED_DRAFT_EMOJI;
+  payload: string;
+};
+
+type ResetDraftEmojiActionType = { type: typeof RESET_DRAFT_EMOJI };
+
+type SavePreferredReactionsFulfilledActionType = {
+  type: typeof SAVE_PREFERRED_REACTIONS_FULFILLED;
+};
+
+type SavePreferredReactionsPendingActionType = {
+  type: typeof SAVE_PREFERRED_REACTIONS_PENDING;
+};
+
+type SavePreferredReactionsRejectedActionType = {
+  type: typeof SAVE_PREFERRED_REACTIONS_REJECTED;
+};
+
+type SelectDraftEmojiToBeReplacedActionType = {
+  type: typeof SELECT_DRAFT_EMOJI_TO_BE_REPLACED;
+  payload: number;
+};
+
+// Action creators
+
+export const actions = {
+  cancelCustomizePreferredReactionsModal,
+  deselectDraftEmoji,
+  openCustomizePreferredReactionsModal,
+  replaceSelectedDraftEmoji,
+  resetDraftEmoji,
+  savePreferredReactions,
+  selectDraftEmojiToBeReplaced,
+};
+
+export const useActions = (): typeof actions => useBoundActions(actions);
+
+function cancelCustomizePreferredReactionsModal(): CancelCustomizePreferredReactionsModalActionType {
+  return { type: CANCEL_CUSTOMIZE_PREFERRED_REACTIONS_MODAL };
+}
+
+function deselectDraftEmoji(): DeselectDraftEmojiActionType {
+  return { type: DESELECT_DRAFT_EMOJI };
+}
+
+function openCustomizePreferredReactionsModal(): ThunkAction<
+  void,
+  RootStateType,
+  unknown,
+  OpenCustomizePreferredReactionsModalActionType
+> {
+  return (dispatch, getState) => {
+    const originalPreferredReactions = getPreferredReactionEmoji(
+      getState().items.preferredReactionEmoji
+    );
+    dispatch({
+      type: OPEN_CUSTOMIZE_PREFERRED_REACTIONS_MODAL,
+      payload: { originalPreferredReactions },
+    });
+  };
+}
+
+function replaceSelectedDraftEmoji(
+  newEmoji: string
+): ReplaceSelectedDraftEmojiActionType {
+  return {
+    type: REPLACE_SELECTED_DRAFT_EMOJI,
+    payload: newEmoji,
+  };
+}
+
+function resetDraftEmoji(): ResetDraftEmojiActionType {
+  return { type: RESET_DRAFT_EMOJI };
+}
+
+function savePreferredReactions(): ThunkAction<
+  void,
+  RootStateType,
+  unknown,
+  | SavePreferredReactionsFulfilledActionType
+  | SavePreferredReactionsPendingActionType
+  | SavePreferredReactionsRejectedActionType
+> {
+  return async (dispatch, getState) => {
+    const { draftPreferredReactions } =
+      getState().preferredReactions.customizePreferredReactionsModal || {};
+    if (!draftPreferredReactions) {
+      log.error(
+        "savePreferredReactions won't work because the modal is not open"
+      );
+      return;
+    }
+
+    dispatch({ type: SAVE_PREFERRED_REACTIONS_PENDING });
+    try {
+      await window.storage.put(
+        'preferredReactionEmoji',
+        draftPreferredReactions
+      );
+      dispatch({ type: SAVE_PREFERRED_REACTIONS_FULFILLED });
+    } catch (err: unknown) {
+      log.warn(Errors.toLogFormat(err));
+      dispatch({ type: SAVE_PREFERRED_REACTIONS_REJECTED });
+    }
+  };
+}
+
+function selectDraftEmojiToBeReplaced(
+  index: number
+): SelectDraftEmojiToBeReplacedActionType {
+  return {
+    type: SELECT_DRAFT_EMOJI_TO_BE_REPLACED,
+    payload: index,
+  };
+}
+
+// Reducer
+
+export function getInitialState(): PreferredReactionsStateType {
+  return {};
+}
+
+export function reducer(
+  state: Readonly<PreferredReactionsStateType> = getInitialState(),
+  action: Readonly<
+    | CancelCustomizePreferredReactionsModalActionType
+    | DeselectDraftEmojiActionType
+    | OpenCustomizePreferredReactionsModalActionType
+    | ReplaceSelectedDraftEmojiActionType
+    | ResetDraftEmojiActionType
+    | SavePreferredReactionsFulfilledActionType
+    | SavePreferredReactionsPendingActionType
+    | SavePreferredReactionsRejectedActionType
+    | SelectDraftEmojiToBeReplacedActionType
+  >
+): PreferredReactionsStateType {
+  switch (action.type) {
+    case CANCEL_CUSTOMIZE_PREFERRED_REACTIONS_MODAL:
+    case SAVE_PREFERRED_REACTIONS_FULFILLED:
+      return omit(state, ['customizePreferredReactionsModal']);
+    case DESELECT_DRAFT_EMOJI:
+      if (!state.customizePreferredReactionsModal) {
+        return state;
+      }
+      return {
+        ...state,
+        customizePreferredReactionsModal: {
+          ...state.customizePreferredReactionsModal,
+          selectedDraftEmojiIndex: undefined,
+        },
+      };
+    case OPEN_CUSTOMIZE_PREFERRED_REACTIONS_MODAL: {
+      const { originalPreferredReactions } = action.payload;
+      return {
+        ...state,
+        customizePreferredReactionsModal: {
+          draftPreferredReactions: originalPreferredReactions,
+          originalPreferredReactions,
+          selectedDraftEmojiIndex: undefined,
+          isSaving: false,
+          hadSaveError: false,
+        },
+      };
+    }
+    case REPLACE_SELECTED_DRAFT_EMOJI: {
+      const newEmoji = action.payload;
+
+      const { customizePreferredReactionsModal } = state;
+      if (!customizePreferredReactionsModal) {
+        return state;
+      }
+
+      const {
+        draftPreferredReactions,
+        selectedDraftEmojiIndex,
+      } = customizePreferredReactionsModal;
+      if (
+        selectedDraftEmojiIndex === undefined ||
+        draftPreferredReactions.includes(newEmoji)
+      ) {
+        return state;
+      }
+
+      return {
+        ...state,
+        customizePreferredReactionsModal: {
+          ...customizePreferredReactionsModal,
+          draftPreferredReactions: replaceIndex(
+            draftPreferredReactions,
+            selectedDraftEmojiIndex,
+            newEmoji
+          ),
+          selectedDraftEmojiIndex: undefined,
+        },
+      };
+    }
+    case RESET_DRAFT_EMOJI:
+      if (!state.customizePreferredReactionsModal) {
+        return state;
+      }
+      return {
+        ...state,
+        customizePreferredReactionsModal: {
+          ...state.customizePreferredReactionsModal,
+          draftPreferredReactions: DEFAULT_PREFERRED_REACTION_EMOJI,
+          selectedDraftEmojiIndex: undefined,
+        },
+      };
+    case SAVE_PREFERRED_REACTIONS_PENDING:
+      if (!state.customizePreferredReactionsModal) {
+        return state;
+      }
+      return {
+        ...state,
+        customizePreferredReactionsModal: {
+          ...state.customizePreferredReactionsModal,
+          selectedDraftEmojiIndex: undefined,
+          isSaving: true,
+          hadSaveError: false,
+        },
+      };
+    case SAVE_PREFERRED_REACTIONS_REJECTED:
+      if (!state.customizePreferredReactionsModal) {
+        return state;
+      }
+      return {
+        ...state,
+        customizePreferredReactionsModal: {
+          ...state.customizePreferredReactionsModal,
+          isSaving: false,
+          hadSaveError: true,
+        },
+      };
+    case SELECT_DRAFT_EMOJI_TO_BE_REPLACED: {
+      const index = action.payload;
+      if (
+        !state.customizePreferredReactionsModal ||
+        !(
+          index in
+          state.customizePreferredReactionsModal.draftPreferredReactions
+        )
+      ) {
+        return state;
+      }
+      return {
+        ...state,
+        customizePreferredReactionsModal: {
+          ...state.customizePreferredReactionsModal,
+          selectedDraftEmojiIndex: index,
+        },
+      };
+    }
+    default:
+      return state;
+  }
+}
--- a/ts/state/reducer.ts
+++ b/ts/state/reducer.ts
@ -1,4 +1,4 @@
-// Copyright 2019-2020 Signal Messenger, LLC
+// Copyright 2019-2021 Signal Messenger, LLC
 // SPDX-License-Identifier: AGPL-3.0-only

 import { combineReducers } from 'redux';
@ -15,6 +15,7 @@ import { reducer as globalModals } from './ducks/globalModals';
 import { reducer as items } from './ducks/items';
 import { reducer as linkPreviews } from './ducks/linkPreviews';
 import { reducer as network } from './ducks/network';
+import { reducer as preferredReactions } from './ducks/preferredReactions';
 import { reducer as safetyNumber } from './ducks/safetyNumber';
 import { reducer as search } from './ducks/search';
 import { reducer as stickers } from './ducks/stickers';
@ -34,6 +35,7 @@ export const reducer = combineReducers({
  items,
  linkPreviews,
  network,
+  preferredReactions,
  safetyNumber,
  search,
  stickers,
--- a/ts/state/selectors/items.ts
+++ b/ts/state/selectors/items.ts
@ -2,6 +2,7 @@
 // SPDX-License-Identifier: AGPL-3.0-only

 import { createSelector } from 'reselect';
+import { isInteger } from 'lodash';

 import { ITEM_NAME as UNIVERSAL_EXPIRE_TIMER_ITEM } from '../../util/universalExpireTimer';

@ -12,6 +13,7 @@ import {
  CustomColorType,
  DEFAULT_CONVERSATION_COLOR,
 } from '../../types/Colors';
+import { getPreferredReactionEmoji as getPreferredReactionEmojiFromStoredValue } from '../../reactions/getPreferredReactionEmoji';

 export const getItems = (state: StateType): ItemsStateType => state.items;

@ -49,3 +51,20 @@ export const getCustomColors = createSelector(
  (state: ItemsStateType): Record<string, CustomColorType> | undefined =>
    state.customColors?.colors
 );
+
+export const getEmojiSkinTone = createSelector(
+  getItems,
+  ({ skinTone }: Readonly<ItemsStateType>): number =>
+    typeof skinTone === 'number' &&
+    isInteger(skinTone) &&
+    skinTone >= 0 &&
+    skinTone <= 5
+      ? skinTone
+      : 0
+);
+
+export const getPreferredReactionEmoji = createSelector(
+  getItems,
+  (state: Readonly<ItemsStateType>): Array<string> =>
+    getPreferredReactionEmojiFromStoredValue(state.preferredReactionEmoji)
+);
--- a/ts/state/selectors/preferredReactions.ts
+++ b/ts/state/selectors/preferredReactions.ts
@ -0,0 +1,22 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { createSelector } from 'reselect';
+
+import type { StateType } from '../reducer';
+import type { PreferredReactionsStateType } from '../ducks/preferredReactions';
+
+const getPreferredReactionsState = (
+  state: Readonly<StateType>
+): PreferredReactionsStateType => state.preferredReactions;
+
+export const getCustomizeModalState = createSelector(
+  getPreferredReactionsState,
+  (state: Readonly<PreferredReactionsStateType>) =>
+    state.customizePreferredReactionsModal
+);
+
+export const getIsCustomizingPreferredReactions = createSelector(
+  getCustomizeModalState,
+  (customizeModal): boolean => Boolean(customizeModal)
+);
--- a/ts/state/smart/App.tsx
+++ b/ts/state/smart/App.tsx
@ -6,6 +6,7 @@ import { connect } from 'react-redux';

 import { App } from '../../components/App';
 import { SmartCallManager } from './CallManager';
+import { SmartCustomizingPreferredReactionsModal } from './CustomizingPreferredReactionsModal';
 import { SmartGlobalModalContainer } from './GlobalModalContainer';
 import { SmartSafetyNumberViewer } from './SafetyNumberViewer';
 import { StateType } from '../reducer';
@ -14,6 +15,7 @@ import {
  getConversationsStoppingMessageSendBecauseOfVerification,
  getNumberOfMessagesPendingBecauseOfVerification,
 } from '../selectors/conversations';
+import { getIsCustomizingPreferredReactions } from '../selectors/preferredReactions';
 import { mapDispatchToProps } from '../actions';
 import type { SafetyNumberProps } from '../../components/SafetyNumberChangeDialog';

@ -24,10 +26,14 @@ const mapStateToProps = (state: StateType) => {
      state
    ),
    i18n: getIntl(state),
+    isCustomizingPreferredReactions: getIsCustomizingPreferredReactions(state),
    numberOfMessagesPendingBecauseOfVerification: getNumberOfMessagesPendingBecauseOfVerification(
      state
    ),
    renderCallManager: () => <SmartCallManager />,
+    renderCustomizingPreferredReactionsModal: () => (
+      <SmartCustomizingPreferredReactionsModal />
+    ),
    renderGlobalModalContainer: () => <SmartGlobalModalContainer />,
    renderSafetyNumber: (props: SafetyNumberProps) => (
      <SmartSafetyNumberViewer {...props} />
--- a/ts/state/smart/CompositionArea.tsx
+++ b/ts/state/smart/CompositionArea.tsx
@ -10,6 +10,7 @@ import { isConversationSMSOnly } from '../../util/isConversationSMSOnly';

 import { selectRecentEmojis } from '../selectors/emojis';
 import { getIntl, getUserConversationId } from '../selectors/user';
+import { getEmojiSkinTone } from '../selectors/items';
 import {
  getConversationSelector,
  getGroupAdminsSelector,
@ -100,7 +101,7 @@ const mapStateToProps = (state: StateType, props: ExternalProps) => {
    },
    // Emojis
    recentEmojis,
-    skinTone: get(state, ['items', 'skinTone'], 0),
+    skinTone: getEmojiSkinTone(state),
    // Stickers
    receivedPacks,
    installedPack,
--- a/ts/state/smart/CustomizingPreferredReactionsModal.tsx
+++ b/ts/state/smart/CustomizingPreferredReactionsModal.tsx
@ -0,0 +1,46 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import * as React from 'react';
+import { useSelector } from 'react-redux';
+
+import type { StateType } from '../reducer';
+import type { LocalizerType } from '../../types/Util';
+import { useActions as usePreferredReactionsActions } from '../ducks/preferredReactions';
+import { useActions as useItemsActions } from '../ducks/items';
+import { getIntl } from '../selectors/user';
+import { getEmojiSkinTone } from '../selectors/items';
+import { getCustomizeModalState } from '../selectors/preferredReactions';
+
+import { CustomizingPreferredReactionsModal } from '../../components/CustomizingPreferredReactionsModal';
+
+export function SmartCustomizingPreferredReactionsModal(): JSX.Element {
+  const preferredReactionsActions = usePreferredReactionsActions();
+  const { onSetSkinTone } = useItemsActions();
+
+  const i18n = useSelector<StateType, LocalizerType>(getIntl);
+
+  const customizeModalState = useSelector<
+    StateType,
+    ReturnType<typeof getCustomizeModalState>
+  >(state => getCustomizeModalState(state));
+  if (!customizeModalState) {
+    throw new Error(
+      '<SmartCustomizingPreferredReactionsModal> requires a modal'
+    );
+  }
+
+  const skinTone = useSelector<StateType, number>(state =>
+    getEmojiSkinTone(state)
+  );
+
+  return (
+    <CustomizingPreferredReactionsModal
+      i18n={i18n}
+      onSetSkinTone={onSetSkinTone}
+      skinTone={skinTone}
+      {...preferredReactionsActions}
+      {...customizeModalState}
+    />
+  );
+}
--- a/ts/state/smart/EmojiPicker.tsx
+++ b/ts/state/smart/EmojiPicker.tsx
@ -1,9 +1,8 @@
-// Copyright 2020 Signal Messenger, LLC
+// Copyright 2020-2021 Signal Messenger, LLC
 // SPDX-License-Identifier: AGPL-3.0-only

 import * as React from 'react';
 import { useSelector } from 'react-redux';
-import { get } from 'lodash';
 import { StateType } from '../reducer';
 import { useRecentEmojis } from '../selectors/emojis';
 import { useActions as useEmojiActions } from '../ducks/emojis';
@ -13,15 +12,19 @@ import {
  Props as EmojiPickerProps,
 } from '../../components/emoji/EmojiPicker';
 import { getIntl } from '../selectors/user';
+import { getEmojiSkinTone } from '../selectors/items';
 import { LocalizerType } from '../../types/Util';

 export const SmartEmojiPicker = React.forwardRef<
  HTMLDivElement,
-  Pick<EmojiPickerProps, 'onPickEmoji' | 'onSetSkinTone' | 'onClose' | 'style'>
->(({ onPickEmoji, onSetSkinTone, onClose, style }, ref) => {
+  Pick<
+    EmojiPickerProps,
+    'onClickSettings' | 'onPickEmoji' | 'onSetSkinTone' | 'onClose' | 'style'
+  >
+>(({ onClickSettings, onPickEmoji, onSetSkinTone, onClose, style }, ref) => {
  const i18n = useSelector<StateType, LocalizerType>(getIntl);
  const skinTone = useSelector<StateType, number>(state =>
-    get(state, ['items', 'skinTone'], 0)
+    getEmojiSkinTone(state)
  );

  const recentEmojis = useRecentEmojis();
@ -41,6 +44,7 @@ export const SmartEmojiPicker = React.forwardRef<
      ref={ref}
      i18n={i18n}
      skinTone={skinTone}
+      onClickSettings={onClickSettings}
      onSetSkinTone={onSetSkinTone}
      onPickEmoji={handlePickEmoji}
      recentEmojis={recentEmojis}
--- a/ts/state/smart/ForwardMessageModal.tsx
+++ b/ts/state/smart/ForwardMessageModal.tsx
@ -2,7 +2,6 @@
 // SPDX-License-Identifier: AGPL-3.0-only

 import { connect } from 'react-redux';
-import { get } from 'lodash';
 import { mapDispatchToProps } from '../actions';
 import {
  ForwardMessageModal,
@ -14,6 +13,7 @@ import { LinkPreviewType } from '../../types/message/LinkPreviews';
 import { getAllComposableConversations } from '../selectors/conversations';
 import { getLinkPreview } from '../selectors/linkPreviews';
 import { getIntl } from '../selectors/user';
+import { getEmojiSkinTone } from '../selectors/items';
 import { selectRecentEmojis } from '../selectors/emojis';
 import { AttachmentType } from '../../types/Attachment';

@ -52,7 +52,7 @@ const mapStateToProps = (

  const candidateConversations = getAllComposableConversations(state);
  const recentEmojis = selectRecentEmojis(state);
-  const skinTone = get(state, ['items', 'skinTone'], 0);
+  const skinTone = getEmojiSkinTone(state);
  const linkPreview = getLinkPreview(state);

  return {
--- a/ts/state/smart/ProfileEditorModal.ts
+++ b/ts/state/smart/ProfileEditorModal.ts
@ -2,7 +2,6 @@
 // SPDX-License-Identifier: AGPL-3.0-only

 import { connect } from 'react-redux';
-import { get } from 'lodash';
 import { mapDispatchToProps } from '../actions';
 import {
  ProfileEditorModal,
@ -11,6 +10,7 @@ import {
 import { PropsDataType } from '../../components/ProfileEditor';
 import { StateType } from '../reducer';
 import { getIntl } from '../selectors/user';
+import { getEmojiSkinTone } from '../selectors/items';
 import { getMe } from '../selectors/conversations';
 import { selectRecentEmojis } from '../selectors/emojis';

@ -28,7 +28,7 @@ function mapStateToProps(
    id: conversationId,
  } = getMe(state);
  const recentEmojis = selectRecentEmojis(state);
-  const skinTone = get(state, ['items', 'skinTone'], 0);
+  const skinTone = getEmojiSkinTone(state);

  return {
    aboutEmoji,
--- a/ts/state/smart/ReactionPicker.tsx
+++ b/ts/state/smart/ReactionPicker.tsx
@ -1,32 +1,62 @@
-// Copyright 2020 Signal Messenger, LLC
+// Copyright 2020-2021 Signal Messenger, LLC
 // SPDX-License-Identifier: AGPL-3.0-only

 import * as React from 'react';
 import { useSelector } from 'react-redux';
-import { get } from 'lodash';
 import { StateType } from '../reducer';
+import { useActions as usePreferredReactionsActions } from '../ducks/preferredReactions';

 import { getIntl } from '../selectors/user';
+import {
+  getEmojiSkinTone,
+  getPreferredReactionEmoji,
+} from '../selectors/items';

 import { LocalizerType } from '../../types/Util';
 import {
  ReactionPicker,
+  ReactionPickerSelectionStyle,
  Props,
 } from '../../components/conversation/ReactionPicker';

-type ExternalProps = Omit<Props, 'skinTone' | 'i18n'>;
+type ExternalProps = Omit<
+  Props,
+  | 'i18n'
+  | 'openCustomizePreferredReactionsModal'
+  | 'preferredReactionEmoji'
+  | 'selectionStyle'
+  | 'skinTone'
+>;

 export const SmartReactionPicker = React.forwardRef<
  HTMLDivElement,
  ExternalProps
 >((props, ref) => {
+  const {
+    openCustomizePreferredReactionsModal,
+  } = usePreferredReactionsActions();
+
  const i18n = useSelector<StateType, LocalizerType>(getIntl);

+  const preferredReactionEmoji = useSelector<StateType, Array<string>>(
+    getPreferredReactionEmoji
+  );
+
  const skinTone = useSelector<StateType, number>(state =>
-    get(state, ['items', 'skinTone'], 0)
+    getEmojiSkinTone(state)
  );

  return (
-    <ReactionPicker ref={ref} skinTone={skinTone} i18n={i18n} {...props} />
+    <ReactionPicker
+      i18n={i18n}
+      openCustomizePreferredReactionsModal={
+        openCustomizePreferredReactionsModal
+      }
+      preferredReactionEmoji={preferredReactionEmoji}
+      ref={ref}
+      selectionStyle={ReactionPickerSelectionStyle.Picker}
+      skinTone={skinTone}
+      {...props}
+    />
  );
 });
--- a/ts/state/smart/renderEmojiPicker.tsx
+++ b/ts/state/smart/renderEmojiPicker.tsx
@ -8,6 +8,7 @@ import { SmartEmojiPicker } from './EmojiPicker';

 export function renderEmojiPicker({
  ref,
+  onClickSettings,
  onPickEmoji,
  onClose,
  style,
@ -15,6 +16,7 @@ export function renderEmojiPicker({
  return (
    <SmartEmojiPicker
      ref={ref}
+      onClickSettings={onClickSettings}
      onPickEmoji={onPickEmoji}
      onClose={onClose}
      style={style}
--- a/ts/test-both/reactions/getPreferredReactionEmoji_test.ts
+++ b/ts/test-both/reactions/getPreferredReactionEmoji_test.ts
@ -0,0 +1,46 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+import { DEFAULT_PREFERRED_REACTION_EMOJI } from '../../reactions/constants';
+
+import { getPreferredReactionEmoji } from '../../reactions/getPreferredReactionEmoji';
+
+describe('getPreferredReactionEmoji', () => {
+  it('returns the default set if passed anything invalid', () => {
+    [
+      // Invalid types
+      undefined,
+      null,
+      DEFAULT_PREFERRED_REACTION_EMOJI.join(','),
+      // Invalid lengths
+      [],
+      DEFAULT_PREFERRED_REACTION_EMOJI.slice(0, 3),
+      [...DEFAULT_PREFERRED_REACTION_EMOJI, 'sparkles'],
+      // Non-strings in the array
+      ['heart', 'thumbsdown', undefined, 'joy', 'open_mouth', 'cry'],
+      ['heart', 'thumbsdown', 99, 'joy', 'open_mouth', 'cry'],
+      // Invalid emoji
+      ['heart', 'thumbsdown', 'gorbage!!', 'joy', 'open_mouth', 'cry'],
+      // Has duplicates
+      ['heart', 'thumbsdown', 'joy', 'joy', 'open_mouth', 'cry'],
+    ].forEach(input => {
+      assert.deepStrictEqual(
+        getPreferredReactionEmoji(input),
+        DEFAULT_PREFERRED_REACTION_EMOJI
+      );
+    });
+  });
+
+  it('returns a custom set if passed a valid value', () => {
+    const input = [
+      'sparkles',
+      'sparkle',
+      'sparkler',
+      'shark',
+      'sparkling_heart',
+      'parking',
+    ];
+    assert.deepStrictEqual(getPreferredReactionEmoji(input), input);
+  });
+});
--- a/ts/test-both/state/ducks/preferredReactions_test.ts
+++ b/ts/test-both/state/ducks/preferredReactions_test.ts
@ -0,0 +1,424 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+import * as sinon from 'sinon';
+import { reducer as rootReducer } from '../../../state/reducer';
+import { noopAction } from '../../../state/ducks/noop';
+import { DEFAULT_PREFERRED_REACTION_EMOJI } from '../../../reactions/constants';
+
+import {
+  PreferredReactionsStateType,
+  actions,
+  getInitialState,
+  reducer,
+} from '../../../state/ducks/preferredReactions';
+
+describe('preferred reactions duck', () => {
+  const getEmptyRootState = () => rootReducer(undefined, noopAction());
+
+  const getRootState = (preferredReactions: PreferredReactionsStateType) => ({
+    ...getEmptyRootState(),
+    preferredReactions,
+  });
+
+  const stateWithOpenCustomizationModal = {
+    ...getInitialState(),
+    customizePreferredReactionsModal: {
+      draftPreferredReactions: [
+        'sparkles',
+        'sparkle',
+        'sparkler',
+        'shark',
+        'sparkling_heart',
+        'parking',
+      ],
+      originalPreferredReactions: [
+        'blue_heart',
+        'thumbsup',
+        'thumbsdown',
+        'joy',
+        'open_mouth',
+        'cry',
+      ],
+      selectedDraftEmojiIndex: undefined,
+      isSaving: false as const,
+      hadSaveError: false,
+    },
+  };
+
+  const stateWithOpenCustomizationModalAndSelectedEmoji = {
+    ...stateWithOpenCustomizationModal,
+    customizePreferredReactionsModal: {
+      ...stateWithOpenCustomizationModal.customizePreferredReactionsModal,
+      selectedDraftEmojiIndex: 1,
+    },
+  };
+
+  let sinonSandbox: sinon.SinonSandbox;
+
+  beforeEach(() => {
+    sinonSandbox = sinon.createSandbox();
+  });
+
+  afterEach(() => {
+    sinonSandbox.restore();
+  });
+
+  describe('cancelCustomizePreferredReactionsModal', () => {
+    const { cancelCustomizePreferredReactionsModal } = actions;
+
+    it("does nothing if the modal isn't open", () => {
+      const action = cancelCustomizePreferredReactionsModal();
+      const result = reducer(getInitialState(), action);
+
+      assert.notProperty(result, 'customizePreferredReactionsModal');
+    });
+
+    it('closes the modal if open', () => {
+      const action = cancelCustomizePreferredReactionsModal();
+      const result = reducer(stateWithOpenCustomizationModal, action);
+
+      assert.notProperty(result, 'customizePreferredReactionsModal');
+    });
+  });
+
+  describe('deselectDraftEmoji', () => {
+    const { deselectDraftEmoji } = actions;
+
+    it('is a no-op if the customization modal is not open', () => {
+      const state = getInitialState();
+      const action = deselectDraftEmoji();
+      const result = reducer(state, action);
+
+      assert.strictEqual(result, state);
+    });
+
+    it('is a no-op if no emoji is selected', () => {
+      const action = deselectDraftEmoji();
+      const result = reducer(stateWithOpenCustomizationModal, action);
+
+      assert.isUndefined(
+        result.customizePreferredReactionsModal?.selectedDraftEmojiIndex
+      );
+    });
+
+    it('deselects a currently-selected emoji', () => {
+      const action = deselectDraftEmoji();
+      const result = reducer(
+        stateWithOpenCustomizationModalAndSelectedEmoji,
+        action
+      );
+
+      assert.isUndefined(
+        result.customizePreferredReactionsModal?.selectedDraftEmojiIndex
+      );
+    });
+  });
+
+  describe('openCustomizePreferredReactionsModal', () => {
+    const { openCustomizePreferredReactionsModal } = actions;
+
+    it('opens the customization modal with defaults if no value was stored', () => {
+      const dispatch = sinon.spy();
+      openCustomizePreferredReactionsModal()(dispatch, getEmptyRootState, null);
+      const [action] = dispatch.getCall(0).args;
+
+      const result = reducer(getEmptyRootState().preferredReactions, action);
+
+      assert.deepEqual(result.customizePreferredReactionsModal, {
+        draftPreferredReactions: DEFAULT_PREFERRED_REACTION_EMOJI,
+        originalPreferredReactions: DEFAULT_PREFERRED_REACTION_EMOJI,
+        selectedDraftEmojiIndex: undefined,
+        isSaving: false,
+        hadSaveError: false,
+      });
+    });
+
+    it('opens the customization modal with stored values', () => {
+      const storedPreferredReactionEmoji = [
+        'sparkles',
+        'sparkle',
+        'sparkler',
+        'shark',
+        'sparkling_heart',
+        'parking',
+      ];
+
+      const emptyRootState = getEmptyRootState();
+      const state = {
+        ...emptyRootState,
+        items: {
+          ...emptyRootState.items,
+          preferredReactionEmoji: storedPreferredReactionEmoji,
+        },
+      };
+
+      const dispatch = sinon.spy();
+      openCustomizePreferredReactionsModal()(dispatch, () => state, null);
+      const [action] = dispatch.getCall(0).args;
+
+      const result = reducer(state.preferredReactions, action);
+
+      assert.deepEqual(result.customizePreferredReactionsModal, {
+        draftPreferredReactions: storedPreferredReactionEmoji,
+        originalPreferredReactions: storedPreferredReactionEmoji,
+        selectedDraftEmojiIndex: undefined,
+        isSaving: false,
+        hadSaveError: false,
+      });
+    });
+  });
+
+  describe('replaceSelectedDraftEmoji', () => {
+    const { replaceSelectedDraftEmoji } = actions;
+
+    it('is a no-op if the customization modal is not open', () => {
+      const state = getInitialState();
+      const action = replaceSelectedDraftEmoji('cat');
+      const result = reducer(state, action);
+
+      assert.strictEqual(result, state);
+    });
+
+    it('is a no-op if no emoji is selected', () => {
+      const action = replaceSelectedDraftEmoji('cat');
+      const result = reducer(stateWithOpenCustomizationModal, action);
+
+      assert.strictEqual(result, stateWithOpenCustomizationModal);
+    });
+
+    it('is a no-op if the new emoji is already in the list', () => {
+      const action = replaceSelectedDraftEmoji('shark');
+      const result = reducer(
+        stateWithOpenCustomizationModalAndSelectedEmoji,
+        action
+      );
+
+      assert.strictEqual(
+        result,
+        stateWithOpenCustomizationModalAndSelectedEmoji
+      );
+    });
+
+    it('replaces the selected draft emoji and deselects', () => {
+      const action = replaceSelectedDraftEmoji('cat');
+      const result = reducer(
+        stateWithOpenCustomizationModalAndSelectedEmoji,
+        action
+      );
+
+      assert.deepStrictEqual(
+        result.customizePreferredReactionsModal?.draftPreferredReactions,
+        ['sparkles', 'cat', 'sparkler', 'shark', 'sparkling_heart', 'parking']
+      );
+      assert.isUndefined(
+        result.customizePreferredReactionsModal?.selectedDraftEmojiIndex
+      );
+    });
+  });
+
+  describe('resetDraftEmoji', () => {
+    const { resetDraftEmoji } = actions;
+
+    it('is a no-op if the customization modal is not open', () => {
+      const state = getInitialState();
+      const action = resetDraftEmoji();
+      const result = reducer(state, action);
+
+      assert.strictEqual(result, state);
+    });
+
+    it('resets the draft emoji to the defaults', () => {
+      const action = resetDraftEmoji();
+      const result = reducer(stateWithOpenCustomizationModal, action);
+
+      assert.deepEqual(
+        result.customizePreferredReactionsModal?.draftPreferredReactions,
+        DEFAULT_PREFERRED_REACTION_EMOJI
+      );
+    });
+
+    it('deselects any selected emoji', () => {
+      const action = resetDraftEmoji();
+      const result = reducer(
+        stateWithOpenCustomizationModalAndSelectedEmoji,
+        action
+      );
+
+      assert.isUndefined(
+        result.customizePreferredReactionsModal?.selectedDraftEmojiIndex
+      );
+    });
+  });
+
+  describe('savePreferredReactions', () => {
+    const { savePreferredReactions } = actions;
+
+    let storagePutStub: sinon.SinonStub;
+    beforeEach(() => {
+      storagePutStub = sinonSandbox.stub(window.storage, 'put').resolves();
+    });
+
+    describe('thunk', () => {
+      it('saves the preferred reaction emoji to storage', async () => {
+        await savePreferredReactions()(
+          sinon.spy(),
+          () => getRootState(stateWithOpenCustomizationModal),
+          null
+        );
+
+        sinon.assert.calledWith(
+          storagePutStub,
+          'preferredReactionEmoji',
+          stateWithOpenCustomizationModal.customizePreferredReactionsModal
+            .draftPreferredReactions
+        );
+      });
+
+      it('on success, dispatches a pending action followed by a fulfilled action', async () => {
+        const dispatch = sinon.spy();
+        await savePreferredReactions()(
+          dispatch,
+          () => getRootState(stateWithOpenCustomizationModal),
+          null
+        );
+
+        sinon.assert.calledTwice(dispatch);
+        sinon.assert.calledWith(dispatch, {
+          type: 'preferredReactions/SAVE_PREFERRED_REACTIONS_PENDING',
+        });
+        sinon.assert.calledWith(dispatch, {
+          type: 'preferredReactions/SAVE_PREFERRED_REACTIONS_FULFILLED',
+        });
+      });
+
+      it('on failure, dispatches a pending action followed by a rejected action', async () => {
+        storagePutStub.rejects(new Error('something went wrong'));
+
+        const dispatch = sinon.spy();
+        await savePreferredReactions()(
+          dispatch,
+          () => getRootState(stateWithOpenCustomizationModal),
+          null
+        );
+
+        sinon.assert.calledTwice(dispatch);
+        sinon.assert.calledWith(dispatch, {
+          type: 'preferredReactions/SAVE_PREFERRED_REACTIONS_PENDING',
+        });
+        sinon.assert.calledWith(dispatch, {
+          type: 'preferredReactions/SAVE_PREFERRED_REACTIONS_REJECTED',
+        });
+      });
+    });
+
+    describe('SAVE_PREFERRED_REACTIONS_FULFILLED', () => {
+      const action = {
+        type: 'preferredReactions/SAVE_PREFERRED_REACTIONS_FULFILLED' as const,
+      };
+
+      it("does nothing if the modal isn't open", () => {
+        const result = reducer(getInitialState(), action);
+
+        assert.notProperty(result, 'customizePreferredReactionsModal');
+      });
+
+      it('closes the modal if open', () => {
+        const result = reducer(stateWithOpenCustomizationModal, action);
+
+        assert.notProperty(result, 'customizePreferredReactionsModal');
+      });
+    });
+
+    describe('SAVE_PREFERRED_REACTIONS_PENDING', () => {
+      const action = {
+        type: 'preferredReactions/SAVE_PREFERRED_REACTIONS_PENDING' as const,
+      };
+
+      it('marks the modal as "saving"', () => {
+        const result = reducer(stateWithOpenCustomizationModal, action);
+
+        assert.isTrue(result.customizePreferredReactionsModal?.isSaving);
+      });
+
+      it('clears any previous errors', () => {
+        const state = {
+          ...stateWithOpenCustomizationModal,
+          customizePreferredReactionsModal: {
+            ...stateWithOpenCustomizationModal.customizePreferredReactionsModal,
+            hadSaveError: true,
+          },
+        };
+        const result = reducer(state, action);
+
+        assert.isFalse(result.customizePreferredReactionsModal?.hadSaveError);
+      });
+
+      it('deselects any selected emoji', () => {
+        const result = reducer(
+          stateWithOpenCustomizationModalAndSelectedEmoji,
+          action
+        );
+
+        assert.isUndefined(
+          result.customizePreferredReactionsModal?.selectedDraftEmojiIndex
+        );
+      });
+    });
+
+    describe('SAVE_PREFERRED_REACTIONS_REJECTED', () => {
+      const action = {
+        type: 'preferredReactions/SAVE_PREFERRED_REACTIONS_REJECTED' as const,
+      };
+
+      it("does nothing if the modal isn't open", () => {
+        const state = getInitialState();
+        const result = reducer(state, action);
+
+        assert.strictEqual(result, state);
+      });
+
+      it('stops loading', () => {
+        const result = reducer(stateWithOpenCustomizationModal, action);
+
+        assert.isFalse(result.customizePreferredReactionsModal?.isSaving);
+      });
+
+      it('saves that there was an error', () => {
+        const result = reducer(stateWithOpenCustomizationModal, action);
+
+        assert.isTrue(result.customizePreferredReactionsModal?.hadSaveError);
+      });
+    });
+  });
+
+  describe('selectDraftEmojiToBeReplaced', () => {
+    const { selectDraftEmojiToBeReplaced } = actions;
+
+    it('is a no-op if the customization modal is not open', () => {
+      const state = getInitialState();
+      const action = selectDraftEmojiToBeReplaced(2);
+      const result = reducer(state, action);
+
+      assert.strictEqual(result, state);
+    });
+
+    it('is a no-op if the index is out of range', () => {
+      const action = selectDraftEmojiToBeReplaced(99);
+      const result = reducer(stateWithOpenCustomizationModal, action);
+
+      assert.strictEqual(result, stateWithOpenCustomizationModal);
+    });
+
+    it('sets the index as the selected one', () => {
+      const action = selectDraftEmojiToBeReplaced(3);
+      const result = reducer(stateWithOpenCustomizationModal, action);
+
+      assert.strictEqual(
+        result.customizePreferredReactionsModal?.selectedDraftEmojiIndex,
+        3
+      );
+    });
+  });
+});
--- a/ts/test-both/state/selectors/items_test.ts
+++ b/ts/test-both/state/selectors/items_test.ts
@ -1,29 +1,62 @@
-// Copyright 2020 Signal Messenger, LLC
+// Copyright 2020-2021 Signal Messenger, LLC
 // SPDX-License-Identifier: AGPL-3.0-only

 import { assert } from 'chai';
-import { getPinnedConversationIds } from '../../../state/selectors/items';
+import {
+  getEmojiSkinTone,
+  getPinnedConversationIds,
+  getPreferredReactionEmoji,
+} from '../../../state/selectors/items';
 import type { StateType } from '../../../state/reducer';
+import type { ItemsStateType } from '../../../state/ducks/items';
+import { DEFAULT_PREFERRED_REACTION_EMOJI } from '../../../reactions/constants';

 describe('both/state/selectors/items', () => {
-  describe('#getPinnedConversationIds', () => {
-    // Note: we would like to use the full reducer here, to get a real empty state object
-    //   but we cannot load the full reducer inside of electron-mocha.
-    function getDefaultStateType(): StateType {
-      return {
-        items: {},
-        // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      } as any;
-    }
+  // Note: we would like to use the full reducer here, to get a real empty state object
+  //   but we cannot load the full reducer inside of electron-mocha.
+  function getRootState(items: ItemsStateType): StateType {
+    return {
+      items,
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    } as any;
+  }

+  describe('#getEmojiSkinTone', () => {
+    it('returns 0 if passed anything invalid', () => {
+      [
+        // Invalid types
+        undefined,
+        null,
+        '2',
+        [2],
+        // Numbers out of range
+        -1,
+        6,
+        Infinity,
+        // Invalid numbers
+        0.1,
+        1.2,
+        NaN,
+      ].forEach(skinTone => {
+        const state = getRootState({ skinTone });
+        assert.strictEqual(getEmojiSkinTone(state), 0);
+      });
+    });
+
+    it('returns all valid skin tones', () => {
+      [0, 1, 2, 3, 4, 5].forEach(skinTone => {
+        const state = getRootState({ skinTone });
+        assert.strictEqual(getEmojiSkinTone(state), skinTone);
+      });
+    });
+  });
+
+  describe('#getPinnedConversationIds', () => {
    it('returns pinnedConversationIds key from items', () => {
      const expected = ['one', 'two'];
-      const state: StateType = {
-        ...getDefaultStateType(),
-        items: {
-          pinnedConversationIds: expected,
-        },
-      };
+      const state: StateType = getRootState({
+        pinnedConversationIds: expected,
+      });

      const actual = getPinnedConversationIds(state);
      assert.deepEqual(actual, expected);
@ -31,10 +64,43 @@ describe('both/state/selectors/items', () => {

    it('returns empty array if no saved data', () => {
      const expected: Array<string> = [];
-      const state = getDefaultStateType();
+      const state = getRootState({});

      const actual = getPinnedConversationIds(state);
      assert.deepEqual(actual, expected);
    });
  });
+
+  describe('#getPreferredReactionEmoji', () => {
+    // See also: the tests for the `getPreferredReactionEmoji` helper.
+
+    it('returns the default set if no value is stored', () => {
+      const state = getRootState({});
+      const actual = getPreferredReactionEmoji(state);
+
+      assert.deepStrictEqual(actual, DEFAULT_PREFERRED_REACTION_EMOJI);
+    });
+
+    it('returns the default set if the stored value is invalid', () => {
+      const state = getRootState({ preferredReactionEmoji: ['garbage!!'] });
+      const actual = getPreferredReactionEmoji(state);
+
+      assert.deepStrictEqual(actual, DEFAULT_PREFERRED_REACTION_EMOJI);
+    });
+
+    it('returns a custom set of emoji', () => {
+      const preferredReactionEmoji = [
+        'sparkles',
+        'sparkle',
+        'sparkler',
+        'shark',
+        'sparkling_heart',
+        'parking',
+      ];
+      const state = getRootState({ preferredReactionEmoji });
+      const actual = getPreferredReactionEmoji(state);
+
+      assert.deepStrictEqual(actual, preferredReactionEmoji);
+    });
+  });
 });
--- a/ts/test-both/state/selectors/preferredReactions_test.ts
+++ b/ts/test-both/state/selectors/preferredReactions_test.ts
@ -0,0 +1,56 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+import { reducer as rootReducer } from '../../../state/reducer';
+import { noopAction } from '../../../state/ducks/noop';
+import type { StateType } from '../../../state/reducer';
+import type { PreferredReactionsStateType } from '../../../state/ducks/preferredReactions';
+
+import { getIsCustomizingPreferredReactions } from '../../../state/selectors/preferredReactions';
+
+describe('both/state/selectors/preferredReactions', () => {
+  const getEmptyRootState = (): StateType =>
+    rootReducer(undefined, noopAction());
+
+  const getRootState = (preferredReactions: PreferredReactionsStateType) => ({
+    ...getEmptyRootState(),
+    preferredReactions,
+  });
+
+  describe('getIsCustomizingPreferredReactions', () => {
+    it('returns false if the modal is closed', () => {
+      assert.isFalse(getIsCustomizingPreferredReactions(getEmptyRootState()));
+    });
+
+    it('returns true if the modal is open', () => {
+      assert.isTrue(
+        getIsCustomizingPreferredReactions(
+          getRootState({
+            customizePreferredReactionsModal: {
+              draftPreferredReactions: [
+                'sparkles',
+                'sparkle',
+                'sparkler',
+                'shark',
+                'sparkling_heart',
+                'parking',
+              ],
+              originalPreferredReactions: [
+                'blue_heart',
+                'thumbsup',
+                'thumbsdown',
+                'joy',
+                'open_mouth',
+                'cry',
+              ],
+              selectedDraftEmojiIndex: undefined,
+              isSaving: false as const,
+              hadSaveError: false,
+            },
+          })
+        )
+      );
+    });
+  });
+});
--- a/ts/test-both/util/replaceIndex_test.ts
+++ b/ts/test-both/util/replaceIndex_test.ts
@ -0,0 +1,32 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+
+import { replaceIndex } from '../../util/replaceIndex';
+
+describe('replaceIndex', () => {
+  it('returns a new array with an index replaced', () => {
+    const original = ['a', 'b', 'c', 'd'];
+    const replaced = replaceIndex(original, 2, 'X');
+
+    assert.deepStrictEqual(replaced, ['a', 'b', 'X', 'd']);
+  });
+
+  it("doesn't modify the original array", () => {
+    const original = ['a', 'b', 'c', 'd'];
+    replaceIndex(original, 2, 'X');
+
+    assert.deepStrictEqual(original, ['a', 'b', 'c', 'd']);
+  });
+
+  it('throws if the index is out of range', () => {
+    const original = ['a', 'b', 'c'];
+
+    [-1, 1.2, 4, Infinity, NaN].forEach(index => {
+      assert.throws(() => {
+        replaceIndex(original, index, 'X');
+      });
+    });
+  });
+});
--- a/ts/types/Storage.d.ts
+++ b/ts/types/Storage.d.ts
@ -110,6 +110,7 @@ export type StorageAccessType = {
  unidentifiedDeliveryIndicators: boolean;
  groupCredentials: Array<GroupCredentialType>;
  lastReceivedAtCounter: number;
+  preferredReactionEmoji: Array<string>;
  skinTone: number;
  unreadCount: number;
  'challenge:retry-message-ids': ReadonlyArray<{
--- a/ts/types/StorageUIKeys.ts
+++ b/ts/types/StorageUIKeys.ts
@ -25,6 +25,7 @@ export const STORAGE_UI_KEYS: ReadonlyArray<keyof StorageAccessType> = [
  'preferred-video-input-device',
  'preferred-audio-input-device',
  'preferred-audio-output-device',
+  'preferredReactionEmoji',
  'skinTone',
  'zoomFactor',
 ];
--- a/ts/util/replaceIndex.ts
+++ b/ts/util/replaceIndex.ts
@ -0,0 +1,16 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+export function replaceIndex<T>(
+  arr: ReadonlyArray<T>,
+  index: number,
+  newItem: T
+): Array<T> {
+  if (!(index in arr)) {
+    throw new RangeError(`replaceIndex: ${index} out of range`);
+  }
+
+  const result = [...arr];
+  result[index] = newItem;
+  return result;
+}
--- a/ts/views/conversation_view.ts
+++ b/ts/views/conversation_view.ts
@ -39,6 +39,7 @@ import {
 import { MessageModel } from '../models/messages';
 import { strictAssert } from '../util/assert';
 import { maybeParseUrl } from '../util/url';
+import { replaceIndex } from '../util/replaceIndex';
 import { addReportSpamJob } from '../jobs/helpers/addReportSpamJob';
 import { reportSpamJobQueue } from '../jobs/reportSpamJobQueue';
 import { GroupNameCollisionsWithIdsByTitle } from '../util/groupMemberNameCollisions';
@ -1925,10 +1926,8 @@ export class ConversationView extends window.Backbone.View<ConversationModel> {
        draftAttachments: [...draftAttachments, onDisk],
      });
    } else {
-      const toUpdate = [...draftAttachments];
-      toUpdate.splice(index, 1, onDisk);
      this.model.set({
-        draftAttachments: toUpdate,
+        draftAttachments: replaceIndex(draftAttachments, index, onDisk),
      });
    }
    this.updateAttachmentsView();