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var pull = require('pull-stream')
var multicb = require('multicb')
var cat = require('pull-cat')
var u = require('./util')
module.exports = About
function About(app, myId, follows) {
this.app = app
this.myId = myId
this.follows = follows
}
About.prototype.createAboutOpStream = function (id) {
return pull(
this.app.sbot.links({dest: id, rel: 'about', values: true, reverse: true, private: true, meta: false}),
this.app.unboxMessages(),
pull.map(function (msg) {
var c = msg.value.content
if (typeof c !== 'object' || c === null) return []
return Object.keys(c).filter(function (key) {
return key !== 'about'
&& key !== 'type'
&& key !== 'recps'
&& key !== 'reason'
}).map(function (key) {
var value = c[key]
return {
id: msg.key,
author: msg.value.author,
timestamp: msg.value.timestamp,
prop: key,
value: value,
remove: value && value.remove,
}
})
}),
pull.flatten()
)
}
About.prototype.createAboutStreams = function (id) {
var ops = this.createAboutOpStream(id)
var scalars = {/* author: {prop: value} */}
var sets = {/* author: {prop: {link}} */}
var setsDone = multicb({pluck: 1, spread: true})
setsDone()(null, pull.values([]))
return {
scalars: pull(
ops,
pull.unique(function (op) {
return op.author + '-' + op.prop + '-'
}),
pull.filter(function (op) {
return !op.remove
})
),
sets: u.readNext(setsDone)
}
}
function computeTopAbout(aboutByFeed) {
var propValueCounts = {/* prop: {value: count} */}
var topValues = {/* prop: value */}
var topValueCounts = {/* prop: count */}
for (var feed in aboutByFeed) {
var feedAbout = aboutByFeed[feed]
for (var prop in feedAbout) {
var value = feedAbout[prop]
var valueCounts = propValueCounts[prop] || (propValueCounts[prop] = {})
var count = (valueCounts[value] || 0) + 1
valueCounts[value] = count
if (count > (topValueCounts[prop] || 0)) {
topValueCounts[prop] = count
topValues[prop] = value
}
}
}
return topValues
}
About.prototype.get = function (dest, cb) {
var self = this
var myAbout = []
var aboutByFeed = {}
var aboutByFeedFollowed = {}
this.follows.getFollows(this.myId, function (err, follows) {
if (err) return cb(err)
pull(
cat([
dest[0] === '%' && self.app.pullGetMsg(dest),
self.app.sbot.links({
rel: 'about',
dest: dest,
values: true,
private: true,
meta: false
})
]),
self.app.unboxMessages(),
pull.drain(function (msg) {
var author = msg.value.author
var c = msg.value.content
if (!c) return
if (msg.key === dest && c.type === 'about') {
// don't describe an about message with itself
return
}
var about = author === self.myId ? myAbout :
follows[author] ?
aboutByFeedFollowed[author] || (aboutByFeedFollowed[author] = {}) :
aboutByFeed[author] || (aboutByFeed[author] = {})
if (c.name) about.name = c.name
if (c.title) about.title = c.title
if (c.image) {
about.image = u.linkDest(c.image)
about.imageLink = u.toLink(c.image)
}
if (c.description) about.description = c.description
if (c.publicWebHosting) about.publicWebHosting = c.publicWebHosting
}, function (err) {
if (err) return cb(err)
var destAbout = aboutByFeedFollowed[dest] || aboutByFeed[dest]
// bias the author's choices by giving them an extra vote
if (destAbout) {
if (follows[dest]) aboutByFeedFollowed._author = destAbout
else aboutByFeed._author = destAbout
}
var about = {}
var followedAbout = computeTopAbout(aboutByFeedFollowed)
var topAbout = computeTopAbout(aboutByFeed)
for (var k in topAbout) about[k] = topAbout[k]
// prefer followed feeds' choices
for (var k in followedAbout) about[k] = followedAbout[k]
// if we follow the destination/author feed, prefer its choices
if (follows[dest]) for (var k in destAbout) about[k] = destAbout[k]
// always prefer own choices
for (var k in myAbout) about[k] = myAbout[k]
cb(null, about)
})
)
})
}
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