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fulfiller.js
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fulfiller.js
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'use strict';
const algoliasearch = require('algoliasearch');
const WORDINGS = {one: 1, two: 2, three: 3, several: 4};
const OPTIONS = {};
OPTIONS[WORDINGS.one] = ["a", "one", "a single"];
OPTIONS[WORDINGS.two] = ["two", "a couple", "a pair of"];
OPTIONS[WORDINGS.three] = ["three", "a few"];
OPTIONS[WORDINGS.several] = ["several", "quite a few", "various"];
const NAMES = ["song", "tune", "track"];
class Fulfiller {
constructor(server) {
this.server = server;
this.version = process.env.HEROKU_RELEASE_VERSION !== undefined ?
process.env.HEROKU_RELEASE_VERSION : 6;
this.client = algoliasearch("TDNMRH8LS3", "ec222292c9b89b658fe00b34ff341194");
this.index = this.client.initIndex("songs");
this.resetResponse();
}
resetResponse() {
this.parameters = {backendVersion: this.version};
this.response = {
'source': "Algolia",
'followupEventInput': {name: "RESULTS", parameters /*TODO:data?*/: this.parameters}
};
}
log(message) {
this.server.log("Fulfiller", message);
}
sendReply(errorMessage, code) {
if (errorMessage !== undefined) {
this.parameters["error"] = errorMessage;
}
if (code === undefined) {
code = 200;
}
this.log("Reply(" + code + "):" + JSON.stringify(this.response, (key, value) => {
switch (key) {
case 'hits':
return '[...]';
case 'source':
return
}
return value;
}, 1));
this.reply(this.response).code(code);
}
serve(req, reply) {
this.resetResponse();
this.reply = reply;
let artist = '', theme = '';
let artistNames = [], songs = [];
this.log("Request: " + JSON.stringify(req.payload, undefined, 1));
if (!(req.mime && req.mime === "application/json")) {
this.sendReply("Your request MUST be application/json.", 400);
return;
}
if (!req.payload.queryResult.intent.displayName.startsWith("Search")) {
this.log("Action requested is not search (" + req.payload.queryResult.action + ").");
this.log("Request: " + JSON.stringify(req.payload, undefined, 1));
this.sendReply(undefined, 200);
return;
}
if (req.payload.queryResult.parameters['artistName']) {
artist = req.payload.queryResult.parameters['artistName'];
this.log("Artist: " + artist);
}
if (req.payload.queryResult.parameters['theme']) {
theme = req.payload.queryResult.parameters['theme'];
this.parameters['theme'] = theme;
this.log("Theme: " + theme);
}
let searchQuery = artist + ' ' + theme;
const searchOptions = {};
if (theme === '') {
if (artist !== '') {
searchOptions['restrictSearchableAttributes'] = ['artistName'];
searchQuery = artist;
} else {
this.log("No artist nor theme -> nothing to search. Req: " + JSON.stringify(req.payload, undefined, 1));
this.sendReply("I can't search for nothing. Please ask me about music by an artist or about a theme!");
return;
}
}
this.index.search(searchQuery, searchOptions, (err, content) => {
if (err) {
this.log(err);
return;
}
this.log("Searching for \"" + searchQuery + "\" returned " + content.nbHits + " results.");
if (content.nbHits > 0) {
for (let i in content.hits) {
let hit = content.hits[i];
if (artistNames.indexOf(hit.artistName) === -1) {
artistNames.push(hit.artistName);
}
this.log('Hit(' + hit.objectID + '): ' + hit.trackName);
songs.push(hit);
}
const artistIsFoundExact = artistNames
.map(it => it.toLowerCase()).indexOf(artist.toLowerCase()) !== -1;
if (artistNames.length === 1) {
if (artistIsFoundExact) { // We found the expected artist
this.parameters["artist"] = artistNames[0];
} else { // We found another artist
this.parameters["artistOther"] = artistNames[0];
}
} else { // We found several artists
this.parameters["artistNames"] = artistNames;
}
}
this.parameters['artistName'] = artist;
this.parameters['songCount'] = undefined;
this.parameters['songTitles'] = undefined;
switch (songs.length) {
case 0:
break;
case 1:
this.parameters['songCount'] = Fulfiller.randomWording(WORDINGS.one);
this.parameters['songTitles'] = songs[0].trackName;
break;
case 2:
this.parameters['songCount'] = Fulfiller.randomWording(WORDINGS.two);
this.parameters['songTitles'] = songs.map(hit => hit.trackName).join(" and ");
break;
case 3:
this.parameters['songCount'] = Fulfiller.randomWording(WORDINGS.three);
this.parameters['songTitles'] = songs.map(hit => hit.trackName).join(", ");
break;
default:
this.parameters['songCount'] = Fulfiller.randomWording(WORDINGS.several);
this.parameters['songTitles'] = songs.slice(0, 3).map(hit => hit.trackName).join(", ") + "..";
break;
}
this.parameters['data'] = content;
this.sendReply();
}
);
};
static randomWording(keyword) {
const quantifiers = OPTIONS[keyword];
const quantifier = quantifiers[Math.floor(Math.random() * quantifiers.length)];
const name = NAMES[Math.floor(Math.random() * NAMES.length)];
const plural = keyword > 1 ? "s" : "";
return quantifier + " " + name + plural;
}
}
let fulfiller = undefined;
module.exports = function (request, reply) {
if (fulfiller === undefined) {
fulfiller = new Fulfiller(require("./server"));
fulfiller.log("New fulfiller!");
}
fulfiller.serve(request, reply);
};