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256 lines (226 loc) · 5.92 KB
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'use strict';
/**
* Module Dependencies
*/
var async = require('async'),
stream = require('getstream');
/**
* Get all likes (optionally for a specific user and/or upload)
* URL: /likes
* Method: GET
* Auth Required: Yes
* @param {string} user_id This required param specifies the user id to filter by
* @param {string} upload_id This required param specifies the upload id to filter by
* @returns {object} Returns a 200 status code with an array of like objects
*/
server.get('/likes', function(req, res, next) {
// extract query params
var params = req.params || {};
// empty array to hold onto our params for sql query
var bindings = [];
// base sql query
var userSql = '';
// if a user id was passed in, get all of the likes for that user
if (params.user_id) {
userSql += `,IF((SELECT 1 AS liked FROM likes WHERE user_id = ? AND upload_id = ?), true, false) AS liked`;
bindings.push(params.user_id);
bindings.push(params.upload_id);
}
// create like count sql
var sql = `
SELECT
COUNT(*) AS likes
${userSql}
FROM likes
`;
// if upload id was passed, append query and push upload id into bindings array
if (params.upload_id) {
sql += ' WHERE upload_id = ? ';
bindings.push(params.upload_id);
}
db.query(sql, bindings, function(err, result) {
if (err) {
log.error(err);
return next(new restify.InternalError(err.message));
}
res.send(200, result[0]);
return next();
});
});
/**
* Create a likes for a specific upload
* URL: /likes
* Method: POST
* Auth Required: Yes
* @param {string} user_id This required param specifies the user id to associate with
* @param {string} upload_id This required param specifies the upload id to associate with
* @returns {object} Returns a 201 status code with the created object
*/
server.post('/likes', function(req, res, next) {
// extract params from body
var data = req.body || {};
data['created_at'] = new Date();
// async waterfall (see: https://github.com/caolan/async)
async.waterfall(
[
// insert like into database
function(cb) {
// execute query and use data passed in via body
db.query('INSERT INTO likes SET ?', data, function(err, like) {
if (err) {
log.error(err);
return next(new restify.InternalError(err.message));
}
// use object assign to merge row id
like = Object.assign({ id: like.insertId }, data);
cb(null, like);
});
},
// get user id from upload
function(like, cb) {
db.query(
'SELECT * FROM uploads WHERE id = ?',
[like.upload_id],
function(err, upload) {
if (err) {
cb(err);
}
cb(null, like, upload);
},
);
},
// send back in response
function(like, upload, cb) {
db.query(
'SELECT COUNT(*) AS total FROM likes WHERE upload_id = ?',
[like.upload_id],
function(err, count) {
if (err) {
cb(err);
}
var result = Object.assign(
{ id: like.id },
{ user_id: upload.user_id },
{ likes: count[0].total },
data,
);
cb(null, result);
},
);
},
function(result, cb) {
db.query(
'SELECT user_id FROM uploads WHERE id = ?',
[result.upload_id],
function(err, row) {
if (err) {
return cb(err);
}
cb(null, Object.assign(result, { to: row[0].user_id }));
},
);
},
// last cb function
function(result, cb) {
// instantiate a new client (server side)
var streamClient = stream.connect(
config.stream.key,
config.stream.secret,
);
// instantiate a feed using feed class 'user' and the user id from the database
var userFeed = streamClient.feed('user', data.user_id);
// build activity object for stream feed
var activity = {
actor: `user:${data.user_id}`,
verb: 'like',
object: `upload:${data.upload_id}`,
foreign_id: `like:${result.id}`,
time: data['created_at'],
to: [`notification:${result.to}`],
};
// add activity to the feed
userFeed
.addActivity(activity)
.then(function(response) {
cb(null, result);
})
.catch(function(err) {
cb(err);
});
},
// final cb callback
],
function(err, result) {
// catch all errors
if (err) {
// use global logger to log to console
log.error(err);
// return error message to client
return next(new restify.InternalError(err));
}
// send response to client
res.send(201, result);
return next();
},
);
});
/**
* Delete a like for a specific upload
* URL: /likes
* Method: DELETE
* Auth Required: Yes
* @param {string} user_id This required param specifies the user id to filter by
* @param {string} upload_id This required param specifies the upload id to filter by
* @returns {object} Returns a 201 status code
*/
server.del('/likes', function(req, res, next) {
// extract query params
var params = req.params || {};
// async waterfall (see: https://github.com/caolan/async)
async.waterfall(
[
// delete like form database
function(cb) {
// execute query
db.query(
'DELETE FROM likes WHERE user_id = ? AND upload_id = ?',
[params.user_id, params.upload_id],
function(err, like) {
if (err) {
cb(err);
}
cb(null, like);
},
);
},
// get like count for response
function(like, cb) {
// execute query
db.query(
'SELECT COUNT(*) AS likes FROM likes WHERE upload_id = ?',
[params.upload_id],
function(err, count) {
if (err) {
cb(err);
}
var result = Object.assign(like, count);
cb(null, result);
},
);
},
// last cb callback
],
function(err, result) {
// catch all errors
if (err) {
// use global logger to log to console
log.error(err);
// return error message to client
return next(new restify.InternalError(err));
}
// send response to client
res.send(200, result[0]);
return next();
},
);
});