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const parseXML = require("xml2js").parseString;
const _ = require("lodash");
const { JSDOM } = require("jsdom");
/**
* Try to load service endpoint with SAP specific SAML authentication
*
* @public
*
* @param {Object} settings - normalized OData library settings. contains
* user creadentials
* @param {agent} agent - instance of HTTP client
* @param {String} endpointUrl - url which is used for testing
*
* @return {Promise} the promise is resolved when endpoint is correctly loaded,
* the promise is rejected othewise
*/
function authenticate(settings, agent, endpointUrl) {
let response;
return new Promise((resolve, reject) => {
agent
.fetch(endpointUrl)
.then((res) => {
response = res;
return authenticate.isPossible(response);
})
.then((isPossible) => {
if (isPossible) {
authenticate
.samlHandshake(settings, agent, response)
.then(resolve, reject);
} else {
let err = new Error(
"OData server does not support SAP - SAML authentification."
);
err.unsupported = true;
reject(err);
}
})
.catch((err) => {
err.unsupported = err.status === 401;
reject(err);
});
});
}
authenticate.authenticatorName = "SAML SAP";
/**
* Main function which goes thru SAML redirects to login form. Fill login form
* and check result from its. Redirects SAML response back to destinatioin system
* and resolve endpoint response after authentification.
*
* @private
*
* @param {Object} settings - normalized OData library settings. contains
* user creadentials
* @param {agent} agent - instance of agent HTTP client
* @param {Object} responseFromEndpointUrl - structure which contains all information
* about request and response from endpoint url before authentication
*
* @returns {Promise} promise which is resolve by response from endpont url after
* authentication or rejected for invalid credentials.
*/
authenticate.samlHandshake = function (
settings,
agent,
responseFromEndpointUrl
) {
return authenticate
.submitRedirectToLoginForm(settings, agent, responseFromEndpointUrl)
.then((responseWithLoginForm) => {
return authenticate.submitLoginForm(
settings,
agent,
responseWithLoginForm
);
})
.then((responseFromLoginForm) => {
if (authenticate.checkResponseFromLoginPage(responseFromLoginForm)) {
return new Promise((resolve, reject) => {
authenticate
.submitRedirectFromLoginForm(settings, agent, responseFromLoginForm)
.then(resolve)
.catch(
authenticate.processDestinationSystemError.bind(null, reject)
);
});
} else {
return Promise.reject(
new Error(
`SAML Identify provider rejected authentification for ${_.get(
settings,
"auth.username",
""
)}.`
)
);
}
});
};
/**
* Process and reject error from endpointurl after SAML authentication.
* Destination service could reject authorization or it could be down ...
*
* @private
*
* @param {Function} callBackError - reject function from new promise
* it is called with error
* @param {Function} errorHttp - http error with response which contains
* error details
*/
authenticate.processDestinationSystemError = function (
callBackError,
errorHttp
) {
if (
_.get(errorHttp, "response.header.content-type", "").match(
"application/xml"
)
) {
parseXML(
_.get(errorHttp, "response.res.text", ""),
(errorParseXML, parsedXML) => {
let customizedError = errorHttp;
let messages = _.get(parsedXML, "error.message");
if (_.isArray(messages) && messages.length > 0) {
customizedError = new Error(
_.chain(_.get(parsedXML, "error.message"))
.map((message) => _.get(message, "_"))
.join("\n")
.value()
);
}
callBackError(customizedError);
}
);
} else {
callBackError(errorHttp);
}
};
/**
* Go thru SAML request/responses which is implemented as chain of the
* requests/responses with HTML pages with forms
*
* @private
*
* @param {Function} requestGenerator - function which generates promise
* for next HTTP request or return null if previous requests was
* last in the request chain
* @param {Promise} previousRequestPromise - promise which is resolved/rejected
* from previous requests in requests chain
* @param {Function} callBack - resolve function from Promise object constructor
* it is called when requests chain is done
* @param {Function} callBackError - reject function from new promise
* it is called with error on any request in chain
*/
authenticate.followRequests = function (
requestGenerator,
previousRequestPromise,
callBack,
callBackError
) {
previousRequestPromise.then(authenticate.readDom).then((response) => {
let nextRequestPromise = requestGenerator(response);
if (!nextRequestPromise) {
callBack(response);
} else {
nextRequestPromise.then(() => {
authenticate.followRequests(
requestGenerator,
nextRequestPromise,
callBack,
callBackError
);
}, callBackError);
}
}, callBackError);
};
/**
* Generates handler which process SAML requests and responses
*
* @private
*
* @param {String} actionFunctionName - name of the function which
* creates requests for specified SAML chain (SAMLRequest,
* SAMLResponse or login form)
*
* @returns {Function} generated handler
*/
authenticate.generateFormHandler = function (actionFunctionName) {
return function (settings, localAgent, responseFromEndpointUrl) {
return new Promise((resolve, reject) => {
authenticate.followRequests(
authenticate[actionFunctionName].bind(null, settings, localAgent),
Promise.resolve(responseFromEndpointUrl),
resolve,
reject
);
});
};
};
authenticate.submitRedirectToLoginForm = authenticate.generateFormHandler(
"submitRedirectToLoginFormAction"
);
authenticate.submitLoginForm = authenticate.generateFormHandler(
"submitLoginFormAction"
);
authenticate.submitRedirectFromLoginForm = authenticate.generateFormHandler(
"submitRedirectFromLoginFormAction"
);
/**
* Convert parameter defined by object to urlencoded form parameter
*
* @param {URLSearchParams} urlParametersToSend parameters to send via fetch
* @param {Object} formParameter object with keys name and value which
* corresponds with the form input
*
* @returns {agent} updated agent request
*/
function reduceFormParameter(urlParametersToSend, formParameter) {
urlParametersToSend.append(formParameter.name, formParameter.value);
return urlParametersToSend;
}
/**
* Filter for inputs which has name parameter
*
* @param {Object} formParameter object with keys name and value which
* corresponds with the form input
*
* @returns {Boolean} true if parameter name is correct
*/
function filterFormInputs(formParameter) {
return formParameter.name;
}
/**
* Filter for inputs which has name parameter
*
* @param {HTMLFormElement} samlForm object which represents SAML form
* @param {*} placeholder just follow lodash API
* @param {Number} index index of element in the form
*
* @returns {Object} object with name and value keys which corresponds
* with input element
*/
function mapFormInputs(samlForm, placeholder, index) {
let input = samlForm.elements[index];
return {
value: input.getAttribute("value"),
name: input.getAttribute("name"),
};
}
/**
* Follow SAML from redirects to login form
*
* @private
*
* @param {Object} settings - normalized OData library settings. contains
* user creadentials
* @param {agent} localAgent - instance of agent HTTP client
* @param {Object} response from endpointUrl which is starting point for SAML authentificaton
* @param {String} contentText content of response
*
* @return {agent} request (which mimic Promise) and is is resolved/rejected when login page
* is found
*/
authenticate.submitRedirectToLoginFormAction = function (
settings,
localAgent,
response
) {
let samlForm;
let postAction;
let formParameters;
let samlRequest = response.dom.window.document.querySelector(
'input[name="SAMLRequest"]'
);
let loginForm = false;
if (samlRequest) {
samlForm = samlRequest.form;
formParameters = _.chain(new Array(samlForm.elements.length))
.map(mapFormInputs.bind(null, samlForm))
.filter(filterFormInputs)
.map((formParameter) => {
if (
formParameter.name.match(
/username$/ || formParameter.name.match(/password$/)
)
) {
loginForm = true;
}
formParameter.value = formParameter.value || "";
return formParameter;
})
.reduce(reduceFormParameter, new URLSearchParams())
.value();
if (loginForm) {
postAction = null;
} else {
postAction = localAgent.fetch(
localAgent.nextRequestUrl(samlForm.getAttribute("action"), response),
{
method: "POST",
body: formParameters,
}
);
}
}
return postAction;
};
/**
* Submit SAP SAML login form
*
* @private
*
* @param {Object} settings - normalized OData library settings. contains
* user creadentials
* @param {agent} localAgent - instance of agent HTTP client
* @param {Object} response from endpointUrl which is starting point for SAML authentificaton
*
* @return {agent} request (which mimic Promise) and is is resolved/rejected when login page
* is found
*/
authenticate.submitLoginFormAction = function (settings, localAgent, response) {
let samlForm;
let submitLoginFormAction;
let samlRequest = response.dom.window.document.querySelector(
'input[name="SAMLRequest"]'
);
let errorDiv =
response.dom.window.document.querySelector('div[role="alert"]');
if (errorDiv) {
submitLoginFormAction = Promise.reject(new Error(errorDiv.textContent));
} else if (samlRequest) {
samlForm = samlRequest.form;
submitLoginFormAction = localAgent.fetch(
localAgent.nextRequestUrl(samlForm.getAttribute("action"), response),
{
method: "POST",
body: _.chain(new Array(samlForm.elements.length))
.map(mapFormInputs.bind(null, samlForm))
.filter(filterFormInputs)
.map((formParameter) => {
if (formParameter.name.match(/username$/)) {
formParameter.value = _.get(settings, "auth.username", "");
}
if (formParameter.name.match(/password$/)) {
formParameter.value = _.get(settings, "auth.password", "");
}
formParameter.value = formParameter.value || "";
return formParameter;
})
.reduce(reduceFormParameter, new URLSearchParams())
.value(),
}
);
}
return submitLoginFormAction;
};
/**
* Process SAML response redirects by forms
*
* @private
*
* @param {Object} settings - normalized OData library settings. contains
* user creadentials
* @param {agent} agent - instance of agent HTTP client
* @param {Object} response from login page request
*
* @return {agent} request (which mimic Promise) and is is resolved/rejected when all SAML response
* forms are processed
*/
authenticate.submitRedirectFromLoginFormAction = function (
settings,
agent,
response
) {
let samlForm;
let postAction;
let samlRequest = response.dom.window.document.querySelector(
'input[name="SAMLResponse"]'
);
if (samlRequest) {
samlForm = samlRequest.form;
postAction = agent.fetch(
agent.nextRequestUrl(samlForm.getAttribute("action"), response),
{
method: "POST",
body: _.chain(new Array(samlForm.elements.length))
.map(mapFormInputs.bind(null, samlForm))
.filter(filterFormInputs)
.map((formParameter) => {
formParameter.value = formParameter.value || "";
return formParameter;
})
.reduce(reduceFormParameter, new URLSearchParams())
.value(),
}
);
}
return postAction;
};
/**
* Check valid response from login page. If response contains SAMLRequests
* (sumbit from login page returns login page again) credentials is invalid.
*
* @private
*
* @param {Object} responseAfterLoginSubmit from login page request
*
* @return {Boolean} credentials are correct/incorrect true/false
*/
authenticate.checkResponseFromLoginPage = function (responseAfterLoginSubmit) {
let dom = new JSDOM(responseAfterLoginSubmit.body);
let samlRequest = dom.window.document.querySelector(
'input[name="SAMLRequest"]'
);
return !samlRequest;
};
/**
* Try to load service endpoint with SAP specific SAML authentication
*
* @private
*
* @param {Object} response - object generated by HTTP Client which
* contains all informations about HTTP response and HTTP request
* to OData endpoint
*
* @return {Promise} the promise is resolved when endpoint is correctly loaded,
* the promise is rejected othewise
*/
authenticate.isPossible = function (response) {
let promise = Promise.resolve(false, response);
let contentType = response.headers.get("content-type");
if (
response.status === 200 &&
_.isString(contentType) &&
contentType.match(/text\/html/)
) {
promise = authenticate.readDom(response).then(() => {
return !!response.dom.window.document.querySelector(
'input[name="SAMLRequest"'
);
});
}
return promise;
};
/**
* Parse text from HTTP response to DOM
*
* @private
*
* @param {Object} response - object generated by fetch with HTTP response
*
* @return {Promise} the promise is resolved when DOM is parsed
*/
authenticate.readDom = function (response) {
let promise;
if (!response.dom) {
promise = response.text().then((textContent) => {
response.dom = new JSDOM(textContent);
return response;
});
} else {
promise = Promise.resolve(response);
}
return promise;
};
module.exports = authenticate;
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