/
hnapi.js
289 lines (257 loc) · 7.99 KB
/
hnapi.js
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var firebase = require('firebase');
var moment = require('moment');
var extend = require('extend');
var url = require('url');
firebase.initializeApp({
databaseURL: 'https://hacker-news.firebaseio.com',
});
var hn = firebase.database().ref('/v0');
var hnRecentItems = hn.child('updates/items');
var typeMapping = {
story: 'link'
};
var cleanText = function(html){
if (!html) return;
// yea yea regex to clean HTML is lame yada yada
html = html.replace(/<\/p>/ig, ''); // remove trailing </p>s
if (!html.match(/^<p>/i)) html = '<p>' + html; // prepend <p>
return html;
}
var api = {
stories: function(base, options, fn){
var opts = extend({
page: 1
}, options);
var page = opts.page;
var limit = 30;
var startIndex = (page-1) * limit;
var endIndex = startIndex + limit;
var stories = hn.child(base).limitToFirst(limit * page);
stories.once('value', function(snapshot){
// Grab all items from the IDs
var items = snapshot.val().slice(startIndex, endIndex);
var itemFetches = items.map(function(itemID){
return new Promise(function(resolve, reject){
var item = hn.child('item/' + itemID);
item.once('value', function(snap){
resolve(snap.val());
}, function(err){
reject(err);
});
});
});
// Throw them all into an array
Promise.all(itemFetches).then(function(res){
var apiRes = res.filter(Boolean).map(function(item){
var commentsCount = item.descendants || 0;
var output = {
id: item.id,
title: item.title,
points: item.score,
user: item.by,
time: item.time, // Unix timestamp
time_ago: moment(item.time*1000).fromNow(),
comments_count: commentsCount,
type: typeMapping[item.type] || item.type
};
if (item.url){
output.url = item.url;
output.domain = url.parse(item.url).hostname.replace(/^www\./i, '');
} else {
output.url = 'item?id=' + item.id; // Simulate "local" links
}
// If it's a job, username and points are useless
if (item.type == 'job'){
output.user = output.points = null;
}
// Identify type=ask
if (item.type == 'story' && output.url.match(/^item/i) && item.title.match(/^ask/i)){
output.type = 'ask';
}
return output;
});
fn(null, apiRes);
}).catch(function(err){
fn(err);
});
});
},
news: function(options, fn){
api.stories('topstories', options, fn);
},
newest: function(options, fn){
api.stories('newstories', options, fn);
},
ask: function(options, fn){
api.stories('askstories', options, fn);
},
show: function(options, fn){
api.stories('showstories', options, fn);
},
jobs: function(options, fn){
api.stories('jobstories', options, fn);
},
newComments: function(fn){ // Not-so-complete 'newComments' too
var recent = hnRecentItems.limitToFirst(30);
recent.once('value', function(snapshot){
var items = snapshot.val();
var itemFetches = items.map(function(itemID){
return new Promise(function(resolve, reject){
var item = hn.child('item/' + itemID);
item.once('value', function(snap){
resolve(snap.val());
}, function(err){
reject(err);
});
});
});
Promise.all(itemFetches).then(function(res){
var stories = res.filter(function(r){
return r.type == 'comment';
});
fn(null, stories);
});
});
},
_item: function(id, isComment){
return new Promise(function(resolve, reject){
var item = hn.child('item/' + id);
var timeout;
var onValue = function(snap){
var val = snap.val();
if (!val){ // Silently resolve with nothing if null
resolve();
clearTimeout(timeout);
return;
}
// Comments
var kidsPromises = Promise.resolve();
if (val.kids && val.kids.length){
kidsPromises = Promise.all(val.kids.map(function(kid){
return api._item(kid, true);
}));
}
// Poll
var partsPromises = Promise.resolve();
if (val.type == 'poll' && val.parts && val.parts.length){
partsPromises = Promise.all(val.parts.map(function(part){
return new Promise(function(res, rej){
var p = hn.child('item/' + part);
p.once('value', function(v){
res(v.val());
}, function(err){
rej(err);
});
});
}));
}
partsPromises.then(function(parts){
clearTimeout(timeout);
if (parts && parts.length) val._parts = parts;
kidsPromises.then(function(kids){
if (kids && kids.length) val._kids = kids;
resolve(val);
}).catch(reject);
}).catch(reject);
};
item.once('value', onValue, function(err){
console.log('Error', id, err);
// Silently resolve because of stupid 'PERMISSION_DENIED' bug from Firebase
if (isComment) resolve();
reject(err);
});
if (isComment) timeout = setTimeout(function(){
console.log('Timeout for #' + id);
item.off('value', onValue);
resolve(); // Silently resolve with nothing if timeout
}, 1000); // Give chance for only 1s
});
},
item: function(id, fn){
api._item(id).then(function(item){
var apiRes = {
id: item.id,
title: item.title,
points: item.score,
user: item.by,
time: item.time, // Unix timestamp
time_ago: moment(item.time*1000).fromNow(),
type: typeMapping[item.type] || item.type,
content: item.deleted ? '[deleted]' : cleanText(item.text),
deleted: item.deleted,
dead: item.dead
};
if (item.url){
apiRes.url = item.url;
apiRes.domain = url.parse(item.url).hostname.replace(/^www\./i, '')
} else {
apiRes.url = 'item?id=' + item.id; // Simulate "local" links
}
// If it's a job, username and points are useless
if (item.type == 'job'){
apiRes.user = apiRes.points = null;
}
// Poll
if (item._parts && item._parts.length){
apiRes.poll = item._parts.map(function(part){
return {
item: part.title,
points: part.score
};
});
}
// Comments
var commentsCount = 0;
var formatComments = function(obj, kids, level){
if (kids && kids.length){
kids = kids.filter(function(kid){
return !!kid;
});
if (!kids.length){
obj.comments = [];
return;
}
commentsCount += kids.length;
obj.comments = kids.map(function(kid){
var res = {
id: kid.id,
level: level,
user: kid.by,
time: kid.time,
time_ago: moment(kid.time*1000).fromNow(),
content: kid.deleted ? '[deleted]' : cleanText(kid.text),
deleted: kid.deleted,
dead: kid.dead
};
formatComments(res, kid._kids, level+1);
return res;
});
} else {
obj.comments = [];
}
};
formatComments(apiRes, item._kids, 0);
apiRes.comments_count = commentsCount;
fn(null, apiRes);
}, function(err){
fn(err);
});
},
user: function(id, fn){
var u = hn.child('user/' + id);
u.once('value', function(snap){
var val = snap.val();
fn(null, {
id: val.id,
created_time: val.created,
created: moment(val.created*1000).fromNow(),
karma: val.karma,
avg: null, // No average yo
about: cleanText(val.about)
});
}, function(err){
fn(err);
});
}
};
module.exports = api;