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var pull = require('pull-stream')
var cat = require('pull-cat')
var h = require('hyperscript')
var b64url = require('base64-url')
var u = exports
u.ssbRefRegex = /((?:@|%|&|ssb:\/\/%)[A-Za-z0-9\/+]{43}=\.[\w\d]+)/g
u.ssbRefRegexOnly = /^(?:@|%|&|ssb:\/\/%)[A-Za-z0-9\/+]{43}=\.[\w\d]+$/
u.ssbRefEncRegex = /((?:ssb:\/\/)?(?:[@%&]|%26|%40|%25)(?:[A-Za-z0-9\/+]|%2[fF]|%2[bB]){43}(?:=|%3[dD])\.[\w\d]+)/g
u.channelRegex = /^#[^\s#]+$/
u.ssbURIRegex = /^(ssb:(message|blob|feed)([:\/])([^:?]*?)([:/])([^?]*)(\\?.*)?)$/
u.gitSsbRepoIdRegex = /^ssb:\/\/(%[A-Za-z0-9\/+]{43}=\.sha256)(\?.*)?$/
u.isRef = function (str) {
if (!str) return false
u.ssbRefRegexOnly.lastIndex = 0
return u.ssbRefRegexOnly.test(str)
}
u.isChannel = function (value) {
return typeof value === 'string'
&& value.length < 30
&& u.channelRegex.test(value)
}
u.readNext = function (fn) {
var next
return function (end, cb) {
if (next) return next(end, cb)
fn(function (err, _next) {
if (err) return cb(err)
next = _next
next(null, cb)
})
}
}
u.pullReverse = function () {
return function (read) {
return u.readNext(function (cb) {
pull(read, pull.collect(function (err, items) {
cb(err, items && pull.values(items.reverse()))
}))
})
}
}
u.toHTML = function (el) {
if (!el) return ''
if (typeof el === 'string' || Array.isArray(el)) {
return h('div', el).innerHTML
}
var html = el.outerHTML || String(el)
if (el.nodeName === 'html') html = '<!doctype html>' + html + '\n'
return html
}
u.hyperwrap = function (fn) {
var token = '__HYPERWRAP_' + Math.random() + '__'
return function (read) {
return u.readNext(function (cb) {
fn(token, function (err, el) {
if (err) return cb(err)
var parts = u.toHTML(el).split(token)
switch (parts.length) {
case 0: return cb(null, pull.empty())
case 1: return cb(null, pull.once(parts[0]))
case 2: return cb(null,
cat([pull.once(parts[0]), read, pull.once(parts[1])]))
default: return cb(new Error('duplicate wrap'))
}
})
})
}
}
u.ifString = function (str) {
if (typeof str === 'string') return str
}
u.ifNumber = function (num) {
if (!isNaN(num)) return num
}
u.toLink = function (link) {
return typeof link === 'string' ? {link: link} : link || null
}
u.linkDest = function (link) {
return link && (u.ifString(link) || u.ifString(link.link))
}
u.toArray = function (x) {
return x == null ? [] : Array.isArray(x) ? x : [x]
}
u.fromArray = function (arr) {
return Array.isArray(arr) && arr.length === 1 ? arr[0] : arr
}
u.toLinkArray = function (x) {
return u.toArray(x).map(u.toLink).filter(u.linkDest)
}
u.toString = function (str) {
switch (typeof str) {
case 'string': return str
case 'object':
if (str !== null) return JSON.stringify(str)
default:
return String(str)
}
}
u.renderError = function(err) {
return h('div.error',
h('h3', err.name),
h('pre', err.stack))
}
u.pullLength = function (cb) {
var len = 0
return pull.through(function (data) {
len += data.length
}, function (err) {
cb(err, len)
})
}
u.tryDecodeJSON = function (json) {
try {
return JSON.parse(json)
} catch(e) {
return null
}
}
u.extractRefs = function (str) {
var ids = []
String(str).replace(u.ssbRefRegex, function (id) {
ids.push(id)
})
return ids
}
u.extractFeedIds = function (str) {
return u.extractRefs(str).filter(function (ref) {
return ref[0] === '@'
})
}
u.extractBlobIds = function (str) {
return u.extractRefs(str).filter(function (ref) {
return ref[0] === '&'
})
}
u.isMsgReadable = function (msg) {
var c = msg && msg.value && msg.value.content
return typeof c === 'object' && c !== null
}
u.isMsgEncrypted = function (msg) {
var value = msg && msg.value
return value && (value.private || typeof value.content === 'string')
}
u.pullConcat = function (cb) {
return pull.collect(function (err, bufs) {
if (err) return cb(err)
cb(null, Buffer.concat(bufs))
})
}
u.customError = function (name) {
return function (message) {
var error = new Error(message)
error.name = name
error.stack = error.stack.replace(/^ at .*\n/m, '')
return error
}
}
u.escapeHTML = function (html) {
if (!html) return ''
return html.toString('utf8')
.replace(/&/g, '&')
.replace(/"/g, '"')
.replace(/</g, '<')
.replace(/>/g, '>')
.replace(/\n/g, '
')
}
u.unescapeHTML = function (text) {
if (typeof text !== 'string') return text
return text.replace(/&/g, '&')
.replace(/"/g, '"')
.replace(/'/g, '\'')
.replace(/>/g, '>')
.replace(/</g, '<')
}
u.pullSlice = function (start, end) {
if (end == null) end = Infinity
var offset = 0
return function (read) {
return function (abort, cb) {
if (abort) read(abort, cb)
else if (offset >= end) read(true, function (err) {
cb(err || true)
})
else if (offset < start) read(null, function next(err, data) {
if (err) return cb(err)
offset += data.length
if (offset <= start) read(null, next)
else if (offset < end) cb(null,
data.slice(data.length - (offset - start)))
else cb(null, data.slice(data.length - (offset - start),
data.length - (offset - end)))
})
else read(null, function (err, data) {
if (err) return cb(err)
offset += data.length
if (offset <= end) cb(null, data)
else cb(null, data.slice(0, data.length - (offset - end)))
})
}
}
}
u.mergeOpts = function (a, b) {
if (typeof b !== 'object' || b === null) return b
if (typeof a !== 'object' || a === null) return a
var obj = {}, k
for (k in a) obj[k] = k in b ? u.mergeOpts(a[k], b[k]) : a[k]
for (k in b) if (!(k in a) && b[k] != null) obj[k] = b[k]
return obj
}
u.escapeId = function (id) {
return b64url.escape(id)
}
u.unescapeId = function (str) {
var m = /^(.)(.*)(\..*)$/.exec(str)
if (!m) return b64url.unescape(str)
return m[1] + b64url.unescape(m[2]) + m[3]
}
u.rows = function (str) {
return String(str).split(/[^\n]{150}|\n/).length
}
u.token = function () {
return '__' + Math.random().toString(36).substr(2) + '__'
}
u.unwrapP = function(html) {
return String(html).replace(/^<p>(.*)<\/p>\s*$/, function ($0, $1) {
return $1
})
}
u.estimateMessageSize = function (content) {
var draftMsg = {
key: '%0000000000000000000000000000000000000000000=.sha256',
value: {
previous: '%0000000000000000000000000000000000000000000=.sha256',
author: '@0000000000000000000000000000000000000000000=.ed25519',
sequence: 10000,
timestamp: 1000000000000,
hash: 'sha256',
content: content,
signature: '00000000000000000000000000000000000000000000000000000000000000000000000000000000000000==.sig.ed25519'
}
}
return JSON.stringify(draftMsg, null, 2).length
}
u.truncate = function (str, len) {
str = String(str)
return str.length > len ? str.substr(0, len) + '...' : str
}
u.extractHostPort = function (id, addr) {
var i = addr.lastIndexOf(':' + id)
if (i > -1 && addr.length === i + id.length + 1) {
return addr.substr(0, i)
}
var m = /^(?:net|onion):([^~;]*(?::[0-9]*)?)~shs:([0-9a-zA-Z/=+]{44})$/.exec(addr)
if (m && id === '@' + m[2] + '.ed25519') {
return m[1]
}
return addr
}
u.translateFromGitSsbRepoId = function (url) {
var m = u.gitSsbRepoIdRegex.exec(url)
if (!m) return
var id = m[1]
var qs = m[2] || ''
return id + qs
}
u.translateFromURI = function (url) {
var m = u.ssbURIRegex.exec(url)
if (!m) return u.translateFromGitSsbRepoId(url)
var uri = m[1]
var prefix = m[2]
var separator = m[3]
var format = m[4]
var separator2 = m[5]
var hash = m[6]
var qs = m[7] || ''
if (separator !== separator2) return
hash = b64url.unescape(hash)
if (separator === '/') {
// ssb-custom-uri
try { hash = decodeURIComponent(hash) }
catch(e) {}
}
var sigil
switch (prefix) {
case 'message': sigil = '%'; break
case 'blob': sigil = '&'; break
case 'feed': sigil = '@'; break
default: return
}
return sigil + hash + '.' + format + qs
}
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