git ssb

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var BinaryXHR = require('binary-xhr')
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var hasHash = /([A-Za-z0-9\/+]{43}=)\.sha256/
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var isUrl = /^https?:\/\//
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var u = require('./util')
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//before calling this, always check whether you alread have
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//a file with this hash.
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exports = module.exports = function (url, cb) {
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  var id = exports.isSecureUrl(secure_url)
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  if(!id)
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    return cb(new Error('is not a secure url:'+secure_url))
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  BinaryXHR(secure_url, function (err, data) {
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    if(err)
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      return cb(new Error('could not retrive secure url:'+err))
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    if(!data || !data.length)
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      return cb(new Error('empty response from:  '+secure_url))
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    u.hash(data, function (err, _id) {
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      if(_id !== id) cb(u.HashError(_id, id))
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      cb(null, data, id)
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    })
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  })
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}
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exports.isSecureUrl = function (string) {
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  var h = hasHash.exec(string)
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  return isUrl.test(string) && h && h[1]
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}
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