Palak Handa / startUpJalsa-Backend

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node_modules/helmet-csp/lib/get-header-keys-for-browser.js 1.94 KB
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f7563de62   Palak Handa   first commit 
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  var ALL_HEADERS = require('./all-headers')
  
  function goodBrowser () {
    return ['Content-Security-Policy']
  }
  
  var handlers = {
    'Android Browser': function (browser, options) {
      if (parseFloat(browser.os.version) < 4.4 || options.disableAndroid) {
        return []
      } else {
        return ['Content-Security-Policy']
      }
    },
  
    Chrome: function (browser) {
      var version = parseFloat(browser.version)
  
      if (version >= 14 && version < 25) {
        return ['X-WebKit-CSP']
      } else if (version >= 25) {
        return ['Content-Security-Policy']
      } else {
        return []
      }
    },
  
    'Chrome Mobile': function (browser) {
      if (browser.os.family === 'iOS') {
        return ['Content-Security-Policy']
      } else {
        return handlers['Android Browser'].apply(this, arguments)
      }
    },
  
    Firefox: function (browser) {
      var version = parseFloat(browser.version)
  
      if (version >= 23) {
        return ['Content-Security-Policy']
      } else if (version >= 4 && version < 23) {
        return ['X-Content-Security-Policy']
      } else {
        return []
      }
    },
  
    IE: function (browser) {
      var version = parseFloat(browser.version)
      var header = version < 12 ? 'X-Content-Security-Policy' : 'Content-Security-Policy'
  
      return [header]
    },
  
    'Microsoft Edge': goodBrowser,
  
    'Microsoft Edge Mobile': goodBrowser,
  
    Opera: function (browser) {
      if (parseFloat(browser.version) >= 15) {
        return ['Content-Security-Policy']
      } else {
        return []
      }
    },
  
    Safari: function (browser) {
      var version = parseFloat(browser.version)
  
      if (version >= 7) {
        return ['Content-Security-Policy']
      } else if (version >= 6) {
        return ['X-WebKit-CSP']
      } else {
        return []
      }
    }
  }
  
  handlers['IE Mobile'] = handlers.IE
  
  module.exports = function getHeaderKeysForBrowser (browser, options) {
    var handler = handlers[browser.name]
  
    if (handler) {
      return handler(browser, options)
    } else {
      return ALL_HEADERS
    }
  }