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app_lib_router-utils.js.html
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<!DOCTYPE html>
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<title>app/lib/router-utils.js - Enketo Express</title>
<meta name="description" content="The full-fledged Enketo web application for the ODK ecosystem" />
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<h2><a href="index.html">Home</a></h2><h2><a href="https://github.com/enketo/enketo-express" target="_blank" class="menu-item" id="repository" >Github repo</a></h2><h2><a href="https://github.com/enketo/enketo-express/blob/master/CHANGELOG.md" target="_blank" class="menu-item" id="change-log" >Change log</a></h2><h3>Tutorials</h3><ul><li><a href="tutorial-00-getting-started.html">Getting started</a></li><li><a href="tutorial-10-configure.html">Configure</a></li><li><a href="tutorial-20-update.html">Update</a></li><li><a href="tutorial-30-develop.html">Develop</a></li><li><a href="tutorial-60-authentication-and-security.html">Authentication and Security</a></li><li><a href="tutorial-70-browser-support.html">Browser support</a></li><li><a href="tutorial-80-comments.html">Comment Feature</a></li><li><a href="tutorial-90-duplicates.html">Duplicate Bug</a></li></ul><h3>Modules</h3><ul><li><a href="module-account-model.html">account-model</a><ul class='methods'><li data-type='method'><a href="module-account-model.html#.check">check</a></li><li data-type='method'><a href="module-account-model.html#.get">get</a></li><li data-type='method'><a href="module-account-model.html#~_getAccount">_getAccount</a></li><li data-type='method'><a href="module-account-model.html#~_getHardcodedAccount">_getHardcodedAccount</a></li><li data-type='method'><a href="module-account-model.html#~_getServer">_getServer</a></li><li data-type='method'><a href="module-account-model.html#~_isAllowed">_isAllowed</a></li><li data-type='method'><a href="module-account-model.html#~_stripProtocol">_stripProtocol</a></li></ul></li><li><a href="module-api-controller.html">api-controller</a></li><li><a href="module-api-v1-controller.html">api-v1-controller</a><ul class='methods'><li data-type='method'><a href="module-api-v1-controller.html#~_generateQueryString">_generateQueryString</a></li><li data-type='method'><a href="module-api-v1-controller.html#~_generateWebformUrls">_generateWebformUrls</a></li><li data-type='method'><a href="module-api-v1-controller.html#~_render">_render</a></li><li data-type='method'><a href="module-api-v1-controller.html#~_setIframe">_setIframe</a></li><li data-type='method'><a href="module-api-v1-controller.html#~_setQuotaUsed">_setQuotaUsed</a></li><li data-type='method'><a href="module-api-v1-controller.html#~_setReturnQueryParam">_setReturnQueryParam</a></li><li data-type='method'><a href="module-api-v1-controller.html#~authCheck">authCheck</a></li><li data-type='method'><a href="module-api-v1-controller.html#~cacheInstance">cacheInstance</a></li><li data-type='method'><a href="module-api-v1-controller.html#~deactivateSurvey">deactivateSurvey</a></li><li data-type='method'><a href="module-api-v1-controller.html#~getExistingSurvey">getExistingSurvey</a></li><li data-type='method'><a href="module-api-v1-controller.html#~getList">getList</a></li><li data-type='method'><a href="module-api-v1-controller.html#~getNewOrExistingSurvey">getNewOrExistingSurvey</a></li><li data-type='method'><a href="module-api-v1-controller.html#~getNumber">getNumber</a></li><li data-type='method'><a href="module-api-v1-controller.html#~removeInstance">removeInstance</a></li></ul></li><li><a href="module-api-v2-controller.html">api-v2-controller</a><ul class='methods'><li data-type='method'><a href="module-api-v2-controller.html#~_generateQueryString">_generateQueryString</a></li><li data-type='method'><a href="module-api-v2-controller.html#~_generateWebformUrls">_generateWebformUrls</a></li><li data-type='method'><a href="module-api-v2-controller.html#~_render">_render</a></li><li data-type='method'><a href="module-api-v2-controller.html#~_renderPdf">_renderPdf</a></li><li data-type='method'><a href="module-api-v2-controller.html#~_setDefaultsQueryParam">_setDefaultsQueryParam</a></li><li data-type='method'><a href="module-api-v2-controller.html#~_setGoToHash">_setGoToHash</a></li><li data-type='method'><a href="module-api-v2-controller.html#~_setIframe">_setIframe</a></li><li data-type='method'><a href="module-api-v2-controller.html#~_setPage">_setPage</a></li><li data-type='method'><a href="module-api-v2-controller.html#~_setQuotaUsed">_setQuotaUsed</a></li><li data-type='method'><a href="module-api-v2-controller.html#~_setReturnQueryParam">_setReturnQueryParam</a></li><li data-type='method'><a href="module-api-v2-controller.html#~authCheck">authCheck</a></li><li data-type='method'><a href="module-api-v2-controller.html#~cacheInstance">cacheInstance</a></li><li data-type='method'><a href="module-api-v2-controller.html#~deactivateSurvey">deactivateSurvey</a></li><li data-type='method'><a href="module-api-v2-controller.html#~emptySurveyCache">emptySurveyCache</a></li><li data-type='method'><a href="module-api-v2-controller.html#~getExistingSurvey">getExistingSurvey</a></li><li data-type='method'><a href="module-api-v2-controller.html#~getList">getList</a></li><li data-type='method'><a href="module-api-v2-controller.html#~getNewOrExistingSurvey">getNewOrExistingSurvey</a></li><li data-type='method'><a href="module-api-v2-controller.html#~getNumber">getNumber</a></li><li data-type='method'><a href="module-api-v2-controller.html#~getVersion">getVersion</a></li><li data-type='method'><a href="module-api-v2-controller.html#~removeInstance">removeInstance</a></li></ul></li><li><a href="module-authentication-controller.html">authentication-controller</a><ul class='methods'><li data-type='method'><a href="module-authentication-controller.html#~login">login</a></li><li data-type='method'><a href="module-authentication-controller.html#~logout">logout</a></li><li data-type='method'><a href="module-authentication-controller.html#~setToken">setToken</a></li></ul></li><li><a href="module-cache-model.html">cache-model</a><ul class='methods'><li data-type='method'><a href="module-cache-model.html#.check">check</a></li><li data-type='method'><a href="module-cache-model.html#.flush">flush</a></li><li data-type='method'><a href="module-cache-model.html#.flushAll">flushAll</a></li><li data-type='method'><a href="module-cache-model.html#.get">get</a></li><li data-type='method'><a href="module-cache-model.html#.getHashes">getHashes</a></li><li data-type='method'><a href="module-cache-model.html#.set">set</a></li><li data-type='method'><a href="module-cache-model.html#~_addHashes">_addHashes</a></li><li data-type='method'><a href="module-cache-model.html#~_getKey">_getKey</a></li></ul></li><li><a href="module-communicator.html">communicator</a><ul class='methods'><li data-type='method'><a href="module-communicator.html#.authenticate">authenticate</a></li><li data-type='method'><a href="module-communicator.html#.getAuthHeader">getAuthHeader</a></li><li data-type='method'><a href="module-communicator.html#.getFormListUrl">getFormListUrl</a></li><li data-type='method'><a href="module-communicator.html#.getManifest">getManifest</a></li><li data-type='method'><a href="module-communicator.html#.getMaxSize">getMaxSize</a></li><li data-type='method'><a href="module-communicator.html#.getSubmissionUrl">getSubmissionUrl</a></li><li data-type='method'><a href="module-communicator.html#.getUpdatedRequestOptions">getUpdatedRequestOptions</a></li><li data-type='method'><a href="module-communicator.html#.getXForm">getXForm</a></li><li data-type='method'><a href="module-communicator.html#.getXFormInfo">getXFormInfo</a></li><li data-type='method'><a href="module-communicator.html#~_findFormAddInfo">_findFormAddInfo</a></li><li data-type='method'><a href="module-communicator.html#~_request">_request</a></li><li data-type='method'><a href="module-communicator.html#~_simplifyFormObj">_simplifyFormObj</a></li><li data-type='method'><a href="module-communicator.html#~_xmlToJson">_xmlToJson</a></li></ul></li><li><a href="module-config-model.html">config-model</a><ul class='members'><li data-type='member'><a href="module-config-model.html#.client">client</a></li><li data-type='member'><a href="module-config-model.html#.server">server</a></li></ul><ul class='methods'><li data-type='method'><a href="module-config-model.html#.getThemesSupported">getThemesSupported</a></li><li data-type='method'><a href="module-config-model.html#~_convertNumbers">_convertNumbers</a></li><li data-type='method'><a href="module-config-model.html#~_convertType">_convertType</a></li><li data-type='method'><a href="module-config-model.html#~_emptyObjectProperties">_emptyObjectProperties</a></li><li data-type='method'><a href="module-config-model.html#~_extractRedisConfigFromUrl">_extractRedisConfigFromUrl</a></li><li data-type='method'><a href="module-config-model.html#~_findNumberIndex">_findNumberIndex</a></li><li data-type='method'><a href="module-config-model.html#~_findSetting">_findSetting</a></li><li data-type='method'><a href="module-config-model.html#~_getEmptyClone">_getEmptyClone</a></li><li data-type='method'><a href="module-config-model.html#~_setRedisConfigFromEnv">_setRedisConfigFromEnv</a></li><li data-type='method'><a href="module-config-model.html#~_updateConfigFromEnv">_updateConfigFromEnv</a></li><li data-type='method'><a href="module-config-model.html#~_updateConfigItemFromEnv">_updateConfigItemFromEnv</a></li></ul></li><li><a href="module-custom-error.html">custom-error</a><ul class='members'><li data-type='member'><a href="module-custom-error.html#.Error">Error</a></li></ul><ul class='methods'><li data-type='method'><a href="module-custom-error.html#.TranslatedError">TranslatedError</a></li></ul></li><li><a href="module-duplicates.html">duplicates</a><ul class='methods'><li data-type='method'><a href="module-duplicates.html#~checkDuplicateEnketoIds">checkDuplicateEnketoIds</a></li><li data-type='method'><a href="module-duplicates.html#~getAllKeys">getAllKeys</a></li><li data-type='method'><a href="module-duplicates.html#~getDuplicates">getDuplicates</a></li><li data-type='method'><a href="module-duplicates.html#~getId">getId</a></li><li data-type='method'><a href="module-duplicates.html#~getSurveyOpenRosaId">getSurveyOpenRosaId</a></li><li data-type='method'><a href="module-duplicates.html#~remove">remove</a></li><li data-type='method'><a href="module-duplicates.html#~removeCache">removeCache</a></li><li data-type='method'><a href="module-duplicates.html#~removeDuplicateEnketoIds">removeDuplicateEnketoIds</a></li></ul></li><li><a href="module-error-handler.html">error-handler</a><ul class='methods'><li data-type='method'><a href="module-error-handler.html#.404">404</a></li><li data-type='method'><a href="module-error-handler.html#.development">development</a></li><li data-type='method'><a href="module-error-handler.html#.production">production</a></li><li data-type='method'><a href="module-error-handler.html#~getErrorMessage">getErrorMessage</a></li></ul></li><li><a href="module-instance-model.html">instance-model</a><ul class='methods'><li data-type='method'><a href="module-instance-model.html#.get">get</a></li><li data-type='method'><a href="module-instance-model.html#.remove">remove</a></li><li data-type='method'><a href="module-instance-model.html#.set">set</a></li></ul></li><li><a href="module-media-controller.html">media-controller</a><ul class='methods'><li data-type='method'><a href="module-media-controller.html#~_extractMediaUrl">_extractMediaUrl</a></li><li data-type='method'><a href="module-media-controller.html#~getMedia">getMedia</a></li></ul></li><li><a href="module-offline-resources-controller.html">offline-resources-controller</a><ul class='methods'><li data-type='method'><a href="module-offline-resources-controller.html#~getScriptContent">getScriptContent</a></li></ul></li><li><a href="module-pages-controller.html">pages-controller</a></li><li><a href="module-pdf.html">pdf</a><ul class='methods'><li data-type='method'><a href="module-pdf.html#.get">get</a></li></ul></li><li><a href="module-router-utils.html">router-utils</a><ul class='members'><li data-type='member'><a href="module-router-utils.html#.idEncryptionKeys">idEncryptionKeys</a></li></ul><ul class='methods'><li data-type='method'><a href="module-router-utils.html#.encryptedEnketoIdSingle">encryptedEnketoIdSingle</a></li><li data-type='method'><a href="module-router-utils.html#.encryptedEnketoIdView">encryptedEnketoIdView</a></li><li data-type='method'><a href="module-router-utils.html#.enketoId">enketoId</a></li><li data-type='method'><a href="module-router-utils.html#~_encryptedEnketoIdParam">_encryptedEnketoIdParam</a></li></ul></li><li><a href="module-submission-model.html">submission-model</a><ul class='methods'><li data-type='method'><a href="module-submission-model.html#.add">add</a></li><li data-type='method'><a href="module-submission-model.html#.isNew">isNew</a></li><li data-type='method'><a href="module-submission-model.html#~_alreadyRecorded">_alreadyRecorded</a></li><li data-type='method'><a href="module-submission-model.html#~_formatter">_formatter</a></li><li data-type='method'><a href="module-submission-model.html#~_getLatestSubmissionIds">_getLatestSubmissionIds</a></li></ul></li><li><a href="module-submissions-controller.html">submissions-controller</a><ul class='methods'><li data-type='method'><a href="module-submissions-controller.html#~_logSubmission">_logSubmission</a></li><li data-type='method'><a href="module-submissions-controller.html#~getInstance">getInstance</a></li><li data-type='method'><a href="module-submissions-controller.html#~maxSize">maxSize</a></li><li data-type='method'><a href="module-submissions-controller.html#~submit">submit</a></li></ul></li><li><a href="module-survey-controller.html">survey-controller</a><ul class='methods'><li data-type='method'><a href="module-survey-controller.html#~_renderWebform">_renderWebform</a></li><li data-type='method'><a href="module-survey-controller.html#~edit">edit</a></li><li data-type='method'><a href="module-survey-controller.html#~offlineWebform">offlineWebform</a></li><li data-type='method'><a href="module-survey-controller.html#~preview">preview</a></li><li data-type='method'><a href="module-survey-controller.html#~redirect">redirect</a></li><li data-type='method'><a href="module-survey-controller.html#~single">single</a></li><li data-type='method'><a href="module-survey-controller.html#~view">view</a></li><li data-type='method'><a href="module-survey-controller.html#~webform">webform</a></li><li data-type='method'><a href="module-survey-controller.html#~xform">xform</a></li></ul></li><li><a href="module-survey-model.html">survey-model</a><ul class='methods'><li data-type='method'><a href="module-survey-model.html#.createNewEnketoId">createNewEnketoId</a></li><li data-type='method'><a href="module-survey-model.html#.get">get</a></li><li data-type='method'><a href="module-survey-model.html#.getId">getId</a></li><li data-type='method'><a href="module-survey-model.html#.getList">getList</a></li><li data-type='method'><a href="module-survey-model.html#.getNumber">getNumber</a></li><li data-type='method'><a href="module-survey-model.html#.incrementSubmissions">incrementSubmissions</a></li><li data-type='method'><a href="module-survey-model.html#.set">set</a></li><li data-type='method'><a href="module-survey-model.html#.update">update</a></li><li data-type='method'><a href="module-survey-model.html#~_404Empty">_404Empty</a></li><li data-type='method'><a href="module-survey-model.html#~_addSurvey">_addSurvey</a></li><li data-type='method'><a href="module-survey-model.html#~_ascendingLaunchDate">_ascendingLaunchDate</a></li><li data-type='method'><a href="module-survey-model.html#~_getActiveSurveys">_getActiveSurveys</a></li><li data-type='method'><a href="module-survey-model.html#~_getEnketoId">_getEnketoId</a></li><li data-type='method'><a href="module-survey-model.html#~_nonEmpty">_nonEmpty</a></li><li data-type='method'><a href="module-survey-model.html#~_updateProperties">_updateProperties</a></li></ul></li><li><a href="module-transformation-controller.html">transformation-controller</a><ul class='methods'><li data-type='method'><a href="module-transformation-controller.html#~_addMediaHash">_addMediaHash</a></li><li data-type='method'><a href="module-transformation-controller.html#~_authenticate">_authenticate</a></li><li data-type='method'><a href="module-transformation-controller.html#~_checkQuota">_checkQuota</a></li><li data-type='method'><a href="module-transformation-controller.html#~_getCombinedHash">_getCombinedHash</a></li><li data-type='method'><a href="module-transformation-controller.html#~_getFormDirectly">_getFormDirectly</a></li><li data-type='method'><a href="module-transformation-controller.html#~_getFormFromCache">_getFormFromCache</a></li><li data-type='method'><a href="module-transformation-controller.html#~_getSurveyParams">_getSurveyParams</a></li><li data-type='method'><a href="module-transformation-controller.html#~_respond">_respond</a></li><li data-type='method'><a href="module-transformation-controller.html#~_setCookieAndCredentials">_setCookieAndCredentials</a></li><li data-type='method'><a href="module-transformation-controller.html#~_updateCache">_updateCache</a></li><li data-type='method'><a href="module-transformation-controller.html#~getSurveyHash">getSurveyHash</a></li><li data-type='method'><a href="module-transformation-controller.html#~getSurveyParts">getSurveyParts</a></li></ul></li><li><a href="module-user-model.html">user-model</a><ul class='methods'><li data-type='method'><a href="module-user-model.html#.getCredentials">getCredentials</a></li></ul></li><li><a href="module-utils.html">utils</a><ul class='methods'><li data-type='method'><a href="module-utils.html#.areOwnPropertiesEqual">areOwnPropertiesEqual</a></li><li data-type='method'><a href="module-utils.html#.cleanUrl">cleanUrl</a></li><li data-type='method'><a href="module-utils.html#.getOpenRosaKey">getOpenRosaKey</a></li><li data-type='method'><a href="module-utils.html#.getXformsManifestHash">getXformsManifestHash</a></li><li data-type='method'><a href="module-utils.html#.insecureAes192Decrypt">insecureAes192Decrypt</a></li><li data-type='method'><a href="module-utils.html#.insecureAes192Encrypt">insecureAes192Encrypt</a></li><li data-type='method'><a href="module-utils.html#.isValidUrl">isValidUrl</a></li><li data-type='method'><a href="module-utils.html#.md5">md5</a></li><li data-type='method'><a href="module-utils.html#.pickRandomItemFromArray">pickRandomItemFromArray</a></li><li data-type='method'><a href="module-utils.html#.randomString">randomString</a></li><li data-type='method'><a href="module-utils.html#~_getKeyIv">_getKeyIv</a></li></ul></li></ul><h3>Global</h3><ul><li><a href="global.html#EnketoRecord">EnketoRecord</a></li><li><a href="global.html#escapeMarkupEntities">escapeMarkupEntities</a></li><li><a href="global.html#ManifestItem">ManifestItem</a></li><li><a href="global.html#replaceMediaSources">replaceMediaSources</a></li><li><a href="global.html#toLocalMediaUrl">toLocalMediaUrl</a></li><li><a href="global.html#toMediaMap">toMediaMap</a></li></ul>
</nav>
<div id="main">
<h1 class="page-title">app/lib/router-utils.js</h1>
<section>
<article>
<pre class="prettyprint source linenums"><code>/**
* @module router-utils
*/
const utils = require( './utils' );
const config = require( '../models/config-model' ).server;
/**
* @static
* @name idEncryptionKeys
* @constant
* @property { string } singleOnce
* @property { string } view
*/
const keys = {
singleOnce: config[ 'less secure encryption key' ],
view: `${config[ 'less secure encryption key' ]}view`,
};
/**
* @static
* @name enketoId
* @function
* @param {module:api-controller~ExpressRequest} req - HTTP request
* @param {module:api-controller~ExpressResponse} res - HTTP response
* @param {Function} next - Express callback
* @param { string } id - Enketo ID
*/
function enketoIdParam( req, res, next, id ) {
if ( /^[A-z0-9]{4,31}$/.test( id ) ) {
req.enketoId = id;
next();
} else {
next( 'route' );
}
}
/**
* Wrapper function for {@link module:router-utils~_encryptedEnketoIdParam|_encryptedEnketoIdParam}
*
* @static
* @name encryptedEnketoIdSingle
* @function
* @param {module:api-controller~ExpressRequest} req - HTTP request
* @param {module:api-controller~ExpressResponse} res - HTTP response
* @param {Function} next - Express callback
* @param { string } id - Enketo ID
*/
function encryptedEnketoIdParamSingle( req, res, next, id ) {
_encryptedEnketoIdParam( req, res, next, id, keys.singleOnce );
}
/**
* Wrapper function for {@link module:router-utils~_encryptedEnketoIdParam|_encryptedEnketoIdParam}
*
* @static
* @name encryptedEnketoIdView
* @function
* @param {module:api-controller~ExpressRequest} req - HTTP request
* @param {module:api-controller~ExpressResponse} res - HTTP response
* @param {Function} next - Express callback
* @param { string } id - Enketo ID
*/
function encryptedEnketoIdParamView( req, res, next, id ) {
_encryptedEnketoIdParam( req, res, next, id, keys.view );
}
/**
* Returns decrypted Enketo ID
*
* @param {module:api-controller~ExpressRequest} req - HTTP request
* @param {module:api-controller~ExpressResponse} res - HTTP response
* @param {Function} next - Express callback
* @param { string } id - Enketo ID
* @param { string } key - Encryption key
*/
function _encryptedEnketoIdParam( req, res, next, id, key ) {
// Do not do a size check because we now have a configurable id size which can be used on an existing server,
// and therefore old (encrypted) IDs may have different lengths as new (encrypted) IDs.
// Routing takes care of FIRST checking whether the ID is a regular unencrypted ID.
try {
// Just see if it can be decrypted. Storing the encrypted value might
// increases chance of leaking underlying enketo_id but for now this is used
// in the submission controller and transformation controller.
const decrypted = utils.insecureAes192Decrypt( id, key );
// Sometimes decryption by incorrect keys works and results in gobledigook.
// A really terrible way of working around this is to check if the result is
// alphanumeric (as Enketo IDs always are).
if ( /^[a-z0-9]+$/i.test( decrypted ) ) {
req.enketoId = decrypted;
req.encryptedEnketoId = id;
next();
} else {
console.error( `decryption with "${key}" worked but result is not alphanumeric, ignoring result:`, decrypted );
next( 'route' );
}
} catch ( e ) {
// console.error( 'Could not decrypt:', req.encryptedEnketoId );
next( 'route' );
}
}
module.exports = {
enketoId: enketoIdParam,
idEncryptionKeys: keys,
encryptedEnketoIdSingle: encryptedEnketoIdParamSingle,
encryptedEnketoIdView: encryptedEnketoIdParamView
};
</code></pre>
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