feat(DTCRCMERC-5374): add flex layout support to renderV2Message

src/server/v2/flex.jsx

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+/** @jsx h */
+/** @jsxFrag Fragment */
+import { h, Fragment } from 'preact';
+
+import { buildContentLabel } from './utils/buildContentLabel';
+import { renderBlock } from './utils/renderBlock';
+import flexStyles from './flexStyles';
+
+export default function FlexMessage({ style, v2Content }) {
+    const color = style.color ?? 'black';
+    const ratio = style.ratio ?? '8x1';
+
+    const mainItems = v2Content?.main_items ?? [];
+    const actionItems = v2Content?.action_items ?? [];
+    const disclaimerItems = v2Content?.disclaimer_items ?? [];
+
+    const logoBlock = mainItems.find(item => item.type === 'IMAGE');
+    const mainBlocks = mainItems.filter(item => item.type !== 'IMAGE');
+
+    const mainLabel = buildContentLabel(mainBlocks);
+    const actionLabel = buildContentLabel(actionItems);
+
+    return (
+        <div
+            className={`pp-message pp-flex ${color} r-${ratio}`}
+            data-pp-style-layout="flex"
+            data-pp-style-color={color}
+            data-pp-style-ratio={ratio}
+        >
+            {/* eslint-disable react/no-danger */}
+            <style
+                dangerouslySetInnerHTML={{
+                    __html: flexStyles({
+                        fontFamily: style.text?.fontFamily,
+                        fontSource: style.text?.fontSource
+                    })
+                }}
+            />
+            {/* eslint-enable react/no-danger */}
+            <div className="pp-flex__background" />
+            <div className="pp-flex__content">
+                {logoBlock ? (
+                    <div className="pp-flex__logo-container">
+                        <span role="img" aria-label={logoBlock.alternative_text || 'PayPal'} className="pp-flex__logo">
+                            {renderBlock(logoBlock)}
+                        </span>
+                    </div>
+                ) : null}
+                <div className="pp-flex__messaging">
+                    <div aria-label={mainLabel} className="pp-flex__main">
+                        {mainBlocks.map((item, idx) => (
+                            // eslint-disable-next-line react/no-array-index-key
+                            <Fragment key={idx}>{renderBlock(item)}</Fragment>
+                        ))}
+                    </div>
+                    {actionItems.length > 0 ? (
+                        <div aria-label={actionLabel} className="pp-flex__action">
+                            {actionItems.map((item, idx) => (
+                                // eslint-disable-next-line react/no-array-index-key
+                                <Fragment key={idx}>{renderBlock(item)}</Fragment>
+                            ))}
+                        </div>
+                    ) : null}
+                    {disclaimerItems.length > 0 ? (
+                        <div className="pp-flex__disclaimer">
+                            {disclaimerItems.map((item, idx) => (
+                                // eslint-disable-next-line react/no-array-index-key
+                                <Fragment key={idx}>{renderBlock(item)}</Fragment>
+                            ))}
+                        </div>
+                    ) : null}
+                </div>
+            </div>
+        </div>
+    );
+}

src/server/v2/flexStyles.js

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+import { buildFontRules } from './font';
+
+const DEFAULT_FONT_FAMILY = '"PayPal Pro", Helvetica, Arial, "Liberation Sans", sans-serif';
+const FONT_FALLBACKS = 'Helvetica, Arial, "Liberation Sans", sans-serif';
+
+const FLEX_THEMES = [
+    { name: 'blue', background: '#023188', contentColor: '#fff', logoFilter: 'brightness(0) invert(1)' },
+    { name: 'black', background: '#000', contentColor: '#fff', logoFilter: 'brightness(0) invert(1)' },
+    { name: 'white', background: '#fff', contentColor: '#023187', border: '1px solid #009cde' },
+    { name: 'white-no-border', background: '#fff', contentColor: '#023187' },
+    { name: 'gray', background: '#eaeced', contentColor: '#023187' },
+    {
+        name: 'monochrome',
+        background: '#fff',
+        contentColor: '#000',
+        border: '1px solid #000',
+        logoFilter: 'grayscale(100%) brightness(0)'
+    },
+    { name: 'grayscale', background: '#fff', border: '1px solid #b7bcbf', logoFilter: 'grayscale(100%)' }
+];
+
+const PORTRAIT_RATIOS = [
+    {
+        name: '1x1',
+        padding: '7%',
+        logoWidth: '50%',
+        logoMarginBottom: '7%',
+        mainFontSize: '10vw',
+        mainLineHeight: '1.1em',
+        disclaimerFontSize: '9.5px'
+    },
+    {
+        name: '1x4',
+        padding: '8%',
+        logoWidth: '70%',
+        logoMarginBottom: '12%',
+        mainFontSize: '1.6rem',
+        mainLineHeight: '1.3em',
+        disclaimerFontSize: '0.75rem'
+    }
+];
+
+const LANDSCAPE_RATIOS = ['8x1', '20x1'];
+
+// Joins landscape selectors with an optional indent on continuation lines (for use inside @media blocks).
+const lscpSel = (sub, indent = '') =>
+    LANDSCAPE_RATIOS.map(r => `.pp-message.pp-flex.r-${r} ${sub}`).join(`,\n${indent}`);
+
+function buildThemeRules() {
+    const bgAndContentRules = FLEX_THEMES.flatMap(({ name, background, contentColor, border }) => {
+        const decls = [contentColor && `color: ${contentColor}`, border && `border: ${border}`]
+            .filter(Boolean)
+            .join('; ');
+        return [
+            `.pp-message.pp-flex.${name} .pp-flex__background { background: ${background}; }`,
+            `.pp-message.pp-flex.${name} .pp-flex__content { ${decls}; }`
+        ];
+    }).join('\n');
+
+    // Group themes sharing the same logo filter to produce grouped selectors.
+    const filterGroups = new Map();
+    FLEX_THEMES.filter(({ logoFilter }) => logoFilter).forEach(({ name, logoFilter }) => {
+        if (!filterGroups.has(logoFilter)) filterGroups.set(logoFilter, []);
+        filterGroups.get(logoFilter).push(name);
+    });
+    const logoFilterRules = Array.from(filterGroups.entries())
+        .map(([filter, names]) => {
+            const sels = names.map(n => `.pp-message.pp-flex.${n} .pp-flex__logo img`).join(',\n');
+            return `${sels} { filter: ${filter}; }`;
+        })
+        .join('\n');
+
+    return `${bgAndContentRules}\n\n${logoFilterRules}`;
+}
+
+function buildPortraitRatioRules() {
+    const contentSels = PORTRAIT_RATIOS.map(({ name }) => `.pp-message.pp-flex.r-${name} .pp-flex__content`).join(
+        ',\n'
+    );
+    const messagingSels = PORTRAIT_RATIOS.map(({ name }) => `.pp-message.pp-flex.r-${name} .pp-flex__messaging`).join(
+        ',\n'
+    );
+
+    const sharedColumnLayout = `${contentSels} {\n    display: flex;\n    flex-direction: column;\n}`;
+
+    const contentPadding = PORTRAIT_RATIOS.map(
+        ({ name, padding }) => `.pp-message.pp-flex.r-${name} .pp-flex__content { padding: ${padding}; }`
+    ).join('\n');
+
+    const logoContainers = PORTRAIT_RATIOS.map(
+        ({ name, logoWidth, logoMarginBottom }) =>
+            `.pp-message.pp-flex.r-${name} .pp-flex__logo-container { width: ${logoWidth}; margin-bottom: ${logoMarginBottom}; }`
+    ).join('\n');
+
+    const perRatioBase = [contentPadding, logoContainers].join('\n');
+
+    const sharedMessaging = `${messagingSels} { flex: 1; }`;
+
+    const mainBlocks = PORTRAIT_RATIOS.map(
+        ({ name, mainFontSize, mainLineHeight }) =>
+            `.pp-message.pp-flex.r-${name} .pp-flex__main {\n    font-size: ${mainFontSize};\n    line-height: ${mainLineHeight};\n    font-weight: 400;\n}`
+    ).join('\n');
+
+    const disclaimerRules = PORTRAIT_RATIOS.map(
+        ({ name, disclaimerFontSize }) =>
+            `.pp-message.pp-flex.r-${name} .pp-flex__disclaimer { font-size: ${disclaimerFontSize}; line-height: 1.1; }`
+    ).join('\n');
+
+    return [
+        sharedColumnLayout,
+        [perRatioBase, sharedMessaging].join('\n'),
+        [mainBlocks, disclaimerRules].join('\n')
+    ].join('\n\n');
+}
+
+export default function flexStyles({ fontFamily, fontSource } = {}) {
+    const { fontFaceRules, effectiveFontFamily } = buildFontRules({
+        fontSource,
+        fontFamily,
+        fallbackStack: FONT_FALLBACKS,
+        defaultFontFamily: DEFAULT_FONT_FAMILY,
+        fontNamePrefix: 'PP Merchant Font'
+    });
+    const fontFaceBlock = fontFaceRules ? `${fontFaceRules}\n` : '';
+
+    return `${fontFaceBlock}
+body {
+    height: 100%;
+    margin: 0;
+    padding: 0;
+}
+
+.pp-message.pp-flex {
+    position: relative;
+    width: 100%;
+    height: 100%;
+    font-family: ${effectiveFontFamily};
+    font-weight: 300;
+    cursor: pointer;
+    box-sizing: border-box;
+    overflow: hidden;
+}
+
+.pp-message.pp-flex .pp-flex__background,
+.pp-message.pp-flex .pp-flex__content {
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    overflow: hidden;
+    box-sizing: border-box;
+}
+
+.pp-message.pp-flex .pp-flex__background {
+    z-index: -1;
+}
+
+${buildThemeRules()}
+
+${buildPortraitRatioRules()}
+
+@media (min-width: 170px) {
+    .pp-message.pp-flex.r-1x1 .pp-flex__main { font-size: 8vw; }
+    .pp-message.pp-flex.r-1x1 .pp-flex__disclaimer { font-size: 5.5vw; }
+}
+
+@media (min-width: 220px) {
+    .pp-message.pp-flex.r-1x1 .pp-flex__disclaimer { font-size: 4.5vw; }
+}
+
+${lscpSel('.pp-flex__content')} {
+    display: flex;
+    flex-direction: row;
+    align-items: center;
+    padding-right: 1rem;
+}
+
+${lscpSel('.pp-flex__logo-container')} {
+    flex: 0 0 33%;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+}
+
+${lscpSel('.pp-flex__logo img')} { width: 60%; }
+
+${lscpSel('.pp-flex__messaging')} {
+    flex: 1 1 100%;
+    display: block;
+}
+
+${lscpSel('.pp-flex__main')} {
+    font-size: 5vw;
+    line-height: 1;
+    margin-bottom: 0.2em;
+    font-weight: 400;
+}
+
+${lscpSel('.pp-flex__disclaimer')} {
+    font-size: 10px;
+    line-height: 1.1;
+    display: inline;
+}
+
+@media (max-aspect-ratio: 61/10) and (min-width: 400px) {
+    ${lscpSel('.pp-flex__logo-container', '    ')} { flex: 0 0 25%; }
+    ${lscpSel('.pp-flex__main', '    ')} { font-size: 4vw; margin-bottom: 0.5rem; }
+}
+
+@media (max-aspect-ratio: 61/10) and (min-width: 520px) {
+    ${lscpSel('.pp-flex__disclaimer', '    ')} { font-size: 0.85rem; }
+}
+
+@media (max-aspect-ratio: 61/10) and (min-width: 640px) {
+    ${lscpSel('.pp-flex__main', '    ')} { font-size: 1.7rem; }
+}
+
+@media (min-aspect-ratio: 200/11) {
+    ${lscpSel('.pp-flex__logo-container', '    ')} { flex: 1 0 20%; }
+    ${lscpSel('.pp-flex__logo img', '    ')} { width: 50%; }
+    ${lscpSel('.pp-flex__messaging', '    ')} {
+        flex: 1 1 85%;
+        display: flex;
+        align-items: center;
+    }
+    ${lscpSel('.pp-flex__main', '    ')} { flex: 1 1 60%; font-size: 0.7rem; line-height: 1; }
+    ${lscpSel('.pp-flex__disclaimer', '    ')} { flex: 0 0 auto; font-size: 8px; line-height: 1.1; }
+}
+
+@media (min-aspect-ratio: 200/11) and (min-width: 400px) {
+    ${lscpSel('.pp-flex__main', '    ')} { font-size: 1rem; }
+}
+
+@media (min-aspect-ratio: 200/11) and (min-width: 600px) {
+    ${lscpSel('.pp-flex__logo-container', '    ')} { flex: 1 0 10%; }
+    ${lscpSel('.pp-flex__logo img', '    ')} { width: 60%; }
+    ${lscpSel('.pp-flex__main', '    ')} { font-size: 1.8vw; }
+    ${lscpSel('.pp-flex__disclaimer', '    ')} { font-size: 0.75rem; }
+}
+
+@media (min-aspect-ratio: 200/11) and (min-width: 1000px) {
+    ${lscpSel('.pp-flex__disclaimer', '    ')} { font-size: 0.9rem; }
+}
+`;
+}

src/server/v2/font.js

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+const isSafeFontName = value => typeof value === 'string' && /^[\w\s-]+$/.test(value.trim());
+const isSafeFontSource = value => typeof value === 'string' && /^https:\/\/[^'")\s]+$/i.test(value);
+
+const formatFontFamilyName = val => {
+    const genericFamilies = {
+        serif: 'serif',
+        'sans-serif': 'sans-serif',
+        monospace: 'monospace',
+        cursive: 'cursive',
+        fantasy: 'fantasy',
+        'system-ui': 'system-ui',
+        'ui-serif': 'ui-serif',
+        'ui-sans-serif': 'ui-sans-serif',
+        'ui-monospace': 'ui-monospace'
+    };
+    return genericFamilies[val] ?? `'${val}'`;
+};
+
+export function buildFontRules({ fontSource, fontFamily, fallbackStack, defaultFontFamily, fontNamePrefix }) {
+    const sources = Array.isArray(fontSource) ? fontSource.filter(isSafeFontSource) : [];
+    const families = Array.isArray(fontFamily) ? fontFamily.filter(isSafeFontName).map(formatFontFamilyName) : [];
+
+    const fontFaceRules = sources
+        .map((url, i) => `@font-face { font-family: '${fontNamePrefix} ${i + 1}'; src: url('${url}'); }`)
+        .join('\n');
+
+    const customSourceNames = sources.map((_, i) => `'${fontNamePrefix} ${i + 1}'`);
+
+    const effectiveFontFamily =
+        customSourceNames.length > 0 || families.length > 0
+            ? [...customSourceNames, ...families, fallbackStack].join(', ')
+            : defaultFontFamily;
+
+    return { fontFaceRules, effectiveFontFamily };
+}