| 1 | var qs = require('query-string')
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| 2 | var toOsm = require('obj2osm')
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| 3 | var fromArray = require('from2-array')
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| 4 |
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| 5 | var errors = require('../errors')
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| 6 | var cmpFork = require('../lib/util').cmpFork
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| 7 |
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| 8 | module.exports = function (req, res, api, params, next) {
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| 9 | var query = qs.parse(qs.extract(req.url))
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| 10 | if (!query[params.type]) {
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| 11 | return next(new errors.MissingParameter(params.type))
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| 12 | }
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| 13 | var ids = query[params.type].split(',')
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| 14 | var results = []
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| 15 | var pending = 1
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| 16 | var sent = false
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| 17 | ids.forEach(function (id, i) {
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| 18 | pending++
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| 19 | api.getElement(id, function (err, forks) {
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| 20 | if (sent) return
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| 21 | if (err) {
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| 22 | sent = true
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| 23 | return next(err)
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| 24 | }
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| 25 | if (!query.forks) {
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| 26 | forks = forks.sort(cmpFork).slice(0, 1)
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| 27 | }
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| 28 | results[i] = forks
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| 29 | if (--pending === 0) done()
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| 30 | })
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| 31 | })
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| 32 | if (--pending === 0) done()
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| 33 |
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| 34 | function done () {
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| 35 | var flattened = []
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| 36 | results.forEach(function (group) {
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| 37 | group.forEach(function (g) {
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| 38 | flattened.push(g)
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| 39 | })
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| 40 | })
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| 41 | var r = fromArray.obj(flattened).on('error', next)
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| 42 | var t = toOsm().on('error', next)
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| 43 | res.setHeader('content-type', 'text/xml; charset=utf-8')
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| 44 | r.pipe(t).pipe(res)
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| 45 | }
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| 46 | }
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| 47 |
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