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react-code-dataset / spectrum /shared /generate-meta-info.js
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/**
* This file is shared between server and client.
* 鈿狅笍 DON'T PUT ANY NODE.JS OR BROWSER-SPECIFIC CODE IN HERE 鈿狅笍
*
* Note: This uses Flow comment syntax so this whole file is actually valid JS without any transpilation
* The reason I did that is because create-react-app doesn't transpile files outside the source folder,
* so it chokes on the Flow syntax.
* More info: https://flow.org/en/docs/types/comments/
*/
var truncate = require('./truncate');
var striptags = require('striptags');
var toPlainText = require('./clients/draft-js/utils/plaintext').toPlainText;
var DEFAULT_META = {
title: 'Spectrum',
description: 'Where communities live.',
};
var HIDE_FROM_CRAWLERS = '<meta name="robots" content="noindex, nofollow">';
/*::
type MaybeMeta = {
title?: string,
description?: string,
extra?: string,
};
type Meta = {
title: string,
description: string,
extra: string,
};
type OtherInput = {
type?: string,
data?: void,
};
type ThreadInput = {
type: 'thread',
data?: { title: string, body?: ?string, communityName?: string, privateChannel?: ?boolean type?: ?string },
};
type UserInput = {
type: 'user',
data?: { name: string, username: string, description?: string },
};
type ChannelInput = {
type: 'channel',
data?: { name: string, description?: string, communityName?: string, private?: ?boolean },
};
type CommunityInput = {
type: 'community',
data?: { name: string, description?: string },
};
type DirectMessageInput = {
type: 'directMessage',
data?: { title: string, description?: string },
};
type Input =
| ThreadInput
| UserInput
| ChannelInput
| CommunityInput
| OtherInput;
*/
function setDefault(input /*: MaybeMeta */) /*: Meta */ {
var title = input.title || DEFAULT_META.title;
var description = input.description || DEFAULT_META.description;
// If theres a custom title but no custom description
// prefix "On spectrum" to the description
// Otherwise you end up with "SpecFM | Where communities live"
if (input.title && !input.description) {
description = 'on Spectrum, ' + DEFAULT_META.description.toLowerCase();
}
return {
title: title,
description: cleanDescription(description),
extra: input.extra || '',
};
}
function cleanDescription(input /*: string */) /*: string */ {
return truncate(striptags(input), 160);
}
function generateMetaInfo(input /*: Input */) /*: Meta */ {
var exists = input || {};
var type = exists.type;
var data = exists.data;
switch (type) {
case 'explore': {
return {
title: 'Explore',
description: 'Explore some of the communities on Spectrum',
};
}
case 'thread': {
if (data.privateChannel)
return setDefault({
extra: HIDE_FROM_CRAWLERS,
});
var body =
data &&
data.body &&
(data.type === 'DRAFTJS'
? toPlainText(JSON.parse(data.body))
: data.body);
return setDefault({
title: data && data.title + ' 路 ' + data.communityName,
description: body,
});
}
case 'user': {
return setDefault({
title: data && data.name + ' 路 @' + data.username,
description: data && data.description,
});
}
case 'channel': {
if (data.private)
return setDefault({
extra: HIDE_FROM_CRAWLERS,
});
return setDefault({
title: data && data.communityName + ' 路 ' + data.name,
description: data && data.description,
});
}
case 'community': {
return setDefault({
title: data && data.name,
description: data && data.description,
});
}
case 'directMessage': {
return setDefault({
title: data && data.title,
description: data && data.description,
});
}
case 'notifications': {
return setDefault({
title: 'Notifications',
description: 'Notifications on Spectrum',
});
}
default: {
return DEFAULT_META;
}
}
}
module.exports = generateMetaInfo;