add MetaMaskTranslation component (#10405)

* add MetaMaskTranslation component

* add stories

* Update ui/app/components/app/metamask-translation/metamask-translation.js

Co-authored-by: Mark Stacey <markjstacey@gmail.com>

* Update ui/app/components/app/metamask-translation/metamask-translation.js

Co-authored-by: Mark Stacey <markjstacey@gmail.com>

* fix regex

Co-authored-by: Mark Stacey <markjstacey@gmail.com>

development/verify-locale-strings.js

@@ -22,9 +22,9 @@
 // //////////////////////////////////////////////////////////////////////////////
 
 const fs = require('fs');
-const path = require('path');
 const { promisify } = require('util');
 const log = require('loglevel');
+const glob = require('fast-glob');
 const matchAll = require('string.prototype.matchall').getPolyfill();
 const localeIndex = require('../app/_locales/index.json');
 const {
@@ -34,7 +34,6 @@ const {
   getLocalePath,
 } = require('./lib/locales');
 
-const readdir = promisify(fs.readdir);
 const readFile = promisify(fs.readFile);
 const writeFile = promisify(fs.writeFile);
 
@@ -168,15 +167,18 @@ async function verifyLocale(code) {
 
 async function verifyEnglishLocale() {
   const englishLocale = await getLocale('en');
-  const uiJSFiles = await findJavascriptFiles(
-    path.resolve(__dirname, '..', 'ui'),
-  );
-  const sharedJSFiles = await findJavascriptFiles(
-    path.resolve(__dirname, '..', 'shared'),
-  );
-
-  const javascriptFiles = sharedJSFiles.concat(uiJSFiles);
+  // As time allows we'll switch to only performing the strict search.
+  // In the meantime we'll use glob to specify which paths can be strict searched
+  // and gradually phase out the key based search
+  const globsToStrictSearch = [
+    'ui/app/components/app/metamask-translation/*.js',
+  ];
+  const javascriptFiles = await glob(['ui/**/*.js', 'shared/**/*.js'], {
+    ignore: globsToStrictSearch,
+  });
+  const javascriptFilesToStrictSearch = await glob(globsToStrictSearch);
 
+  const strictSearchRegex = /\bt\(\s*'(\w+)'\s*\)|\btranslationKey:\s*'(\w+)'/gu;
   // match "t(`...`)" because constructing message keys from template strings
   // prevents this script from finding the messages, and then inappropriately
   // deletes them
@@ -190,10 +192,21 @@ async function verifyEnglishLocale() {
     for (const match of matchAll.call(fileContents, keyRegex)) {
       usedMessages.add(match[1] || match[2]);
     }
+    const templateMatches = fileContents.match(templateStringRegex);
+    if (templateMatches) {
+      templateMatches.forEach((match) => templateUsage.push(match));
+    }
+  }
+
+  for await (const fileContents of getFileContents(
+    javascriptFilesToStrictSearch,
+  )) {
+    for (const match of matchAll.call(fileContents, strictSearchRegex)) {
+      usedMessages.add(match[1] || match[2] || match[3] || match[4]);
+    }
 
     const templateMatches = fileContents.match(templateStringRegex);
     if (templateMatches) {
-      // concat doesn't work here for some reason
       templateMatches.forEach((match) => templateUsage.push(match));
     }
   }
@@ -237,21 +250,6 @@ async function verifyEnglishLocale() {
   return true; // failed === true
 }
 
-async function findJavascriptFiles(rootDir) {
-  const javascriptFiles = [];
-  const contents = await readdir(rootDir, { withFileTypes: true });
-  for (const file of contents) {
-    if (file.isDirectory()) {
-      javascriptFiles.push(
-        ...(await findJavascriptFiles(path.join(rootDir, file.name))),
-      );
-    } else if (file.isFile() && file.name.endsWith('.js')) {
-      javascriptFiles.push(path.join(rootDir, file.name));
-    }
-  }
-  return javascriptFiles;
-}
-
 async function* getFileContents(filenames) {
   for (const filename of filenames) {
     yield readFile(filename, 'utf8');

ui/app/components/app/metamask-template-renderer/metamask-template-renderer.js

@@ -77,7 +77,7 @@ const MetaMaskTemplateRenderer = ({ sections }) => {
   );
 };
 
-const SectionShape = {
+export const SectionShape = {
   props: PropTypes.object,
   element: PropTypes.oneOf(Object.keys(safeComponentList)).isRequired,
   key: PropTypes.string,

ui/app/components/app/metamask-template-renderer/safe-component-list.js

@@ -5,8 +5,10 @@ import TruncatedDefinitionList from '../../ui/truncated-definition-list';
 import Popover from '../../ui/popover';
 import Typography from '../../ui/typography';
 import Box from '../../ui/box';
+import MetaMaskTranslation from '../metamask-translation';
 
 export const safeComponentList = {
+  MetaMaskTranslation,
   b: 'b',
   p: 'p',
   div: 'div',

ui/app/components/app/metamask-translation/index.js

@@ -0,0 +1 @@
+export { default } from './metamask-translation';

ui/app/components/app/metamask-translation/metamask-translation.js

@@ -0,0 +1,80 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { useI18nContext } from '../../../hooks/useI18nContext';
+import MetaMaskTemplateRenderer, {
+  SectionShape,
+} from '../metamask-template-renderer/metamask-template-renderer';
+
+/**
+ * MetaMaskTranslation is a simple helper Component for adding full translation
+ * support to the template system. We do pass the translation function to the
+ * template getValues function, but passing it React components as variables
+ * would require React to be in scope, and breaks the object pattern paradigm.
+ *
+ * This component gets around that by converting variables that are templates
+ * themselves into tiny React trees. This component does additional validation
+ * to make sure that the tree has a single root node, with maximum two leaves.
+ * Each subnode can have a maximum of one child that must be a string.
+ *
+ * This enforces a maximum recursion depth of 2, preventing translation strings
+ * from being performance hogs. We could further limit this, and also attenuate
+ * the safeComponentList for what kind of components we allow these special
+ * trees to contain.
+ */
+export default function MetaMaskTranslation({ translationKey, variables }) {
+  const t = useI18nContext();
+
+  return t(
+    translationKey,
+    variables?.map((variable) => {
+      if (
+        typeof variable === 'object' &&
+        !Array.isArray(variable) &&
+        variable.element
+      ) {
+        if (!variable.key) {
+          throw new Error(
+            `When using MetaMask Template Language in a MetaMaskTranslation variable, you must provide a key for the section regardless of syntax.
+            Section with element '${variable.element}' for translationKey: '${translationKey}' has no key property`,
+          );
+        }
+        if (
+          variable.children &&
+          Array.isArray(variable.children) &&
+          variable.children.length > 2
+        ) {
+          throw new Error(
+            'MetaMaskTranslation only renders templates with a single section and maximum two children',
+          );
+        } else if (
+          (variable.children?.[0]?.children !== undefined &&
+            typeof variable.children[0].children !== 'string') ||
+          (variable.children?.[1]?.children !== undefined &&
+            typeof variable.children[1].children !== 'string')
+        ) {
+          throw new Error(
+            'MetaMaskTranslation does not allow for component trees of non trivial depth',
+          );
+        }
+        return (
+          <MetaMaskTemplateRenderer
+            key={`${translationKey}-${variable.key}`}
+            sections={variable}
+          />
+        );
+      }
+      return variable;
+    }),
+  );
+}
+
+MetaMaskTranslation.propTypes = {
+  translationKey: PropTypes.string.isRequired,
+  variables: PropTypes.arrayOf(
+    PropTypes.oneOfType([
+      PropTypes.string,
+      PropTypes.number,
+      PropTypes.shape(SectionShape),
+    ]),
+  ),
+};

ui/app/components/app/metamask-translation/metamask-translation.stories.js

@@ -0,0 +1,66 @@
+import React from 'react';
+import { select, object } from '@storybook/addon-knobs';
+import { groupBy } from 'lodash';
+import en from '../../../../../app/_locales/en/messages.json';
+import MetaMaskTranslation from './metamask-translation';
+
+export default {
+  title: 'MetaMaskTranslation',
+};
+
+const { keysWithSubstitution, keysWithoutSubstitution } = groupBy(
+  Object.keys(en),
+  (key) => {
+    if (en[key].message.includes('$1')) {
+      return 'keysWithSubstitution';
+    }
+    return 'keysWithoutSubstitution';
+  },
+);
+
+export const withoutSubstitutions = () => (
+  <MetaMaskTranslation
+    translationKey={select(
+      'translationKey',
+      keysWithoutSubstitution,
+      keysWithoutSubstitution[0],
+    )}
+  />
+);
+
+export const withSubstitutions = () => (
+  <MetaMaskTranslation
+    translationKey={select(
+      'translationKey',
+      keysWithSubstitution,
+      keysWithSubstitution[0],
+    )}
+    variables={object('variables', [])}
+  />
+);
+
+export const withTemplate = () => (
+  <MetaMaskTranslation
+    translationKey={select(
+      'translationKey',
+      keysWithSubstitution,
+      keysWithSubstitution[0],
+    )}
+    variables={[
+      {
+        element: 'span',
+        key: 'link',
+        children: {
+          element: 'MetaMaskTranslation',
+          props: {
+            translationKey: select(
+              'innerTranslationKey',
+              keysWithoutSubstitution,
+              keysWithoutSubstitution[0],
+            ),
+          },
+        },
+      },
+    ]}
+  />
+);