sbot/ui/lib/markdown.js

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'use strict'
var emojiNamedCharacters = require('emoji-named-characters')
var marked = require('ssb-marked')
var ssbref = require('ssb-ref')
var mlib = require('ssb-msgs')
var renderer = new marked.Renderer();
// override to only allow external links or hashes, and correctly link to ssb objects
renderer.urltransform = function (url) {
var c = url.charAt(0)
var hasSigil = (c == '@' || c == '&' || c == '%')
if (this.options.sanitize && !hasSigil) {
try {
var prot = decodeURIComponent(unescape(url))
.replace(/[^\w:]/g, '')
.toLowerCase();
} catch (e) {
return false;
}
if (prot.indexOf('javascript:') === 0) {
return false;
}
}
var islink = ssbref.isLink(url)
if (hasSigil && !islink && this.options.mentionNames) {
// do a name lookup
url = this.options.mentionNames[url.slice(1)]
if (!url)
return false
islink = true
}
if (islink) {
if (ssbref.isFeedId(url))
return '#/profile/'+url
else if (ssbref.isMsgId(url))
return '#/msg/'+url
else if (ssbref.isBlobId(url))
return '#/webview/'+url
}
else if (url.indexOf('http') !== 0) {
return false;
}
return url
}
// override to make http/s links external
renderer.link = function(href, title, text) {
href = this.urltransform(href)
var out
if (href !== false)
out = '<a href="' + href + '"';
else
out = '<a class="bad"'
if (title) {
out += ' title="' + title + '"';
}
// make a popup if http/s
if (href && href.indexOf('http') === 0)
out += ' target="_blank"'
out += '>' + text + '</a>';
return out;
};
// override to support <video> tags (HACK)
renderer.image = function (href, title, text) {
href = href.replace(/^&amp;/, '&')
if (ssbref.isLink(href)) {
if ((''+text).indexOf('.webm') >= 0) {
var out = '<video autoplay=1 loop=1 muted=1 src="http://localhost:7777/' + href + '?fallback=video" alt="' + text + '"'
if (title) {
out += ' title="' + title + '"'
}
out += '></video>'
} else {
var out = '<a href="#/webview/' + href + '"><img src="http://localhost:7777/' + href + '?fallback=img" alt="' + text + '"'
if (title) {
out += ' title="' + title + '"'
}
out += '></a>'
}
return out
}
return text
}
marked.setOptions({
gfm: true,
mentions: true,
tables: true,
breaks: true,
pedantic: false,
sanitize: true,
smartLists: true,
smartypants: false,
emoji: renderEmoji,
renderer: renderer
});
exports.block = function(text, mentionNames) {
if (mentionNames && mentionNames.key && mentionNames.value) {
// is a message, get the mentions links
mentionNames = mlib.links(mentionNames.value.content.mentions, 'feed')
}
if (Array.isArray(mentionNames)) {
// is an array of links, turn into an object map
var n = {}
mentionNames.forEach(function (link) {
n[link.name] = link.link
})
mentionNames = n
}
return marked(''+(text||''), { mentionNames: mentionNames })
}
var emojiRegex = /(\s|>|^)?:([A-z0-9_]+):(\s|<|$)/g;
exports.emojis = function (str) {
return str.replace(emojiRegex, function(full, $1, $2, $3) {
return ($1||'') + renderEmoji($2) + ($3||'')
})
}
function renderEmoji (emoji) {
return emoji in emojiNamedCharacters ?
'<img src="./img/emoji/' + encodeURI(emoji) + '.png"'
+ ' alt=":' + escape(emoji) + ':"'
+ ' title=":' + escape(emoji) + ':"'
+ ' class="emoji" align="absmiddle" height="20" width="20">'
: ':' + emoji + ':'
}