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Viewing file:     context-matcher.js (2.1 KB)      -rw-r--r--

var _ = require('lodash')
var url = require('url')
var isGlob = require('is-glob')
var micromatch = require('micromatch')
var ERRORS = require('./errors')

module.exports = {
  match: matchContext
}

function matchContext(context, uri, req) {
  // single path
  if (isStringPath(context)) {
    return matchSingleStringPath(context, uri)
  }

  // single glob path
  if (isGlobPath(context)) {
    return matchSingleGlobPath(context, uri)
  }

  // multi path
  if (Array.isArray(context)) {
    if (context.every(isStringPath)) {
      return matchMultiPath(context, uri)
    }
    if (context.every(isGlobPath)) {
      return matchMultiGlobPath(context, uri)
    }

    throw new Error(ERRORS.ERR_CONTEXT_MATCHER_INVALID_ARRAY)
  }

  // custom matching
  if (_.isFunction(context)) {
    var pathname = getUrlPathName(uri)
    return context(pathname, req)
  }

  throw new Error(ERRORS.ERR_CONTEXT_MATCHER_GENERIC)
}

/**
 * @param  {String} context '/api'
 * @param  {String} uri     'http://example.org/api/b/c/d.html'
 * @return {Boolean}
 */
function matchSingleStringPath(context, uri) {
  var pathname = getUrlPathName(uri)
  return pathname.indexOf(context) === 0
}

function matchSingleGlobPath(pattern, uri) {
  var pathname = getUrlPathName(uri)
  var matches = micromatch(pathname, pattern)
  return matches && matches.length > 0
}

function matchMultiGlobPath(patternList, uri) {
  return matchSingleGlobPath(patternList, uri)
}

/**
 * @param  {String} contextList ['/api', '/ajax']
 * @param  {String} uri     'http://example.org/api/b/c/d.html'
 * @return {Boolean}
 */
function matchMultiPath(contextList, uri) {
  for (var i = 0; i < contextList.length; i++) {
    var context = contextList[i]
    if (matchSingleStringPath(context, uri)) {
      return true
    }
  }
  return false
}

/**
 * Parses URI and returns RFC 3986 path
 *
 * @param  {String} uri from req.url
 * @return {String}     RFC 3986 path
 */
function getUrlPathName(uri) {
  return uri && url.parse(uri).pathname
}

function isStringPath(context) {
  return _.isString(context) && !isGlob(context)
}

function isGlobPath(context) {
  return isGlob(context)
}