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getNarrative.js
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getNarrative.js
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const fetch = require('node-fetch');
const queryString = require("query-string");
const utils = require("./utils");
const helpers = require("./getDatasetHelpers");
const auspice = require("auspice");
const getNarrative = async (req, res) => {
let prefix;
try {
prefix = queryString.parse(req.url.split("?")[1]).prefix;
} catch (err) {
return helpers.handleError(res, "No prefix in narrative URL query");
}
/*
* "inrb-drc" was the first of the Nextstrain groups. Groups now live at
* `nextstrain.org/groups`, but we want to support old URLs for INRB DRC by
* redirecting requests from "/inrb-drc" to "/groups/inrb-drc".
*/
if (prefix.startsWith('/inrb-drc')) {
return res.redirect("getNarrative?prefix=/groups" + prefix);
}
const {source, prefixParts} = helpers.splitPrefixIntoParts(prefix);
// Authorization
if (!source.visibleToUser(req.user)) {
return helpers.unauthorized(req, res);
}
// Remove 'en' from nCoV narrative prefixParts
if (prefixParts[0] === 'ncov') {
const index = prefixParts.indexOf('en');
if (index >= 0) {
prefixParts.splice(index, 1);
}
}
// Generate the narrative's origin URL for fetching.
const narrative = source.narrative(prefixParts);
const fetchURL = narrative.url();
utils.log(`trying to fetch & parse narrative file: ${fetchURL}`);
try {
const response = await fetch(fetchURL);
if (!response.ok) {
throw new Error(`Failed to fetch ${fetchURL}: ${response.status} ${response.statusText}`);
}
const fileContents = await response.text();
const blocks = auspice.parseNarrativeFile(fileContents);
const blocksForClient = JSON.stringify(blocks).replace(/</g, '\\u003c');
utils.verbose("SUCCESS");
return res.send(blocksForClient);
} catch (err) {
return helpers.handleError(res, `Narratives couldn't be served -- ${err.message}`);
}
};
module.exports = {
default: getNarrative
};