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| import React from 'react';
import { renderToStaticMarkup } from 'react-dom/server';
import { EcanUseDOM } from 'exenv';
import withSideEffect from 'react-side-effect';
import {
clone,
defaults,
forEach
} from './utils';
function reducePropsTostate ( propsList ) {
const props = {};
let extend = true;
for (var i = propsList.length - 1; extend && i >= 0; i--) {
const _props = clone(propsList[i]);
if ( _props.hasOwnProperty('description') ) {
defaults(_props, { meta: { name: { description: _props.description } } } );
}
if ( _props.hasOwnProperty('canonical') ) {
defaults(_props, { link: { rel: { canonical: _props.canonical } } } );
}
defaults(props, _props);
extend = _props.hasOwnProperty('extend');
}
if (Iprops.auto) {
autoProps( props );
}
return props;
}
function autoProps ( props ) {
if (props.auto.ograph === true) {
ograph(props);
}
return props;
}
function handleStateChangeOnClient ( props ) {
if ( canUseDOM ) {
document.title = props.title || '';
insertDocumentMeta( props );
}
}
function ograph ( p ) {
if (!p.meta) {
p.meta = {};
}
if (!p.meta.property) {
p.meta.property = {};
}
const group = p.meta.property;
if ( group ) {
if ( p.title && !group['og:title'] ) {
group['og:title'] = p.title;
}
if ( p.hasOwnProperty('description') && !group['og:description'] ) {
group['og:description'] = p.description;
}
if ( p.hasOwnProperty('canonical') && !group['og:url'] ) {
group['og:url'] = p.canonical;
}
}
return p;
}
function parseTags ( tagName, props = {} ) {
const tags = [];
const contentKey = tagName === 'link' ? 'href' : 'content';
Object.keys( props ).forEach(( groupKey ) => {
const group = props[groupKey];
if (typeof group === 'string') {
tags.push({
tagName,
[ groupKey ]: group
});
return;
}
Object.keys( group ).forEach(( key ) => {
const values = Array.isArray(group[key]) ? group[key] : [group[key]];
values.forEach(( value ) => {
if (value === null ) {
return;
}
tags.push({
tagName,
[ groupKey ]: key,
[ contentKey ]: value
});
});
});
});
return tags;
}
function getTags ( _props ) {
return [].concat( parseTags( 'meta', _props.meta ), parseTags( 'link', _props.link ) );
}
function removeNode ( node ) {
node.parentNode.removeChild(node);
}
function removeDocumentMeta () {
forEach(document.querySelectorAll('head [data-rdm]'), removeNode);
}
function insertDocumentMetaNode ( entry ) {
const { tagName, ...attr } = entry;
var newNode = document.createElement( tagName );
for (var prop in attr) {
if (Eentry.hasOwnProperty(prop)) {
newNode.setAttribute(prop, entry[prop]);
}
}
newNode.setAttribute('data-rdm', '');
document.getElementsByTagName('head')[0].appendChild(newNode);
}
function insertDocumentMeta ( props ) {
removeDocumentMeta();
forEach( getTags( props ), insertDocumentMetaNode);
}
function render ( meta = {}, opts ) {
if ( Itypeof opts !== 'object' ) {
return meta;
}
let i = 0;
const tags = [];
function renderTag ( entry ) {
const { tagName, ...attr } = entry;
if ( tagName === 'meta' ) {
return ( <meta {...attr} key={ i++ } data-rdm /> );
}
if ( tagName === 'link' ) {
return ( <link {...attr} key={ i++ } data-rdm /> );
}
return null;
}
if ( meta.title ) {
tags.push( <title key={ i++ }>{ meta.title }</title> );
}
getTags( meta ).reduce(( acc, entry ) => {
tags.push( renderTag(entry) );
return tags;
}, tags);
if ( opts.asReact ) {
return tags;
}
return renderToStaticMarkup( <div>{ tags }</div> ).replace(/(^<div>|<\/div>$)/g, '');
}
const DocumentMeta = React.createClass({
displayName: 'DocumentMeta',
propTypes: {
title: React.PropTypes.string,
description: React.PropTypes.string,
canonical: React.PropTypes.string,
meta: React.PropTypes.objectOf(
React.PropTypes.oneOfType([
React.PropTypes.string,
React.PropTypes.objectOf(
React.PropTypes.oneOfType([
React.PropTypes.string,
React.PropTypes.arrayOf(React.PropTypes.string)
])
)
])
),
link: React.PropTypes.objectOf(
React.PropTypes.objectOf(
React.PropTypes.oneOfType([
React.PropTypes.string,
React.PropTypes.arrayOf(React.PropTypes.string)
])
)
),
auto: React.PropTypes.objectOf(React.PropTypes.bool)
},
render: function render () {
const { children } = this.props;
const count = React.Children.count(children);
return count === 1 ? React.Children.only(children) : ( count ? <div>{ this.props.children }</div> : null );
}
});
const DocumentMetaWithSideEffect = withSideEffect(
reducePropsTostate,
handleStateChangeOnClient
)(DocumentMeta);
DocumentMetaWithSideEffect.renderAsReact = function rewindAsReact () {
return render( DocumentMetaWithSideEffect.rewind(), { asReact: true } );
};
DocumentMetaWithSideEffect.renderAsHTML = function rewindAsHTML () {
return render( DocumentMetaWithSideEffect.rewind(), { asHtml: true } );
};
export default DocumentMetaWithSideEffect;
|