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index.js
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index.js
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const args = process.argv.slice(2),
crypto = require('crypto'),
restify = require('restify'),
got = require('got'),
showdown = require('showdown'),
redis = require("redis"),
converter = new showdown.Converter(),
rds = redis.createClient(args[0] || 6379, args[1] || '127.0.0.1');
/**
* Section Init
*/
// restify
const server = restify.createServer();
server.use(restify.plugins.bodyParser({}));
// showdown
converter.setFlavor('github');
// redis
rds.on("error", (error) => {
console.error(error);
});
// staticpage
const staticPageKey = args[2] || 'ALL';
// client.set("key", "value", redis.print);
// client.get("key", redis.print);
// API 1: markdown to html
server.post('/mdToHtml', (req, res, next) => {
if (req.body.md !== undefined) {
const cacheKey = 'md:html:' + crypto.createHash('md5').update(req.body.md).digest('hex');
rds.get(cacheKey, (err, cacheVal) => {
if (!cacheVal) {
const htmlRaw = converter.makeHtml(req.body.md);
rds.set(cacheKey, htmlRaw, () => {
rds.expire(cacheKey, 600);
});
res.send(htmlRaw);
} else {
res.send(cacheVal);
rds.expire(cacheKey, 600);
}
next();
});
} else {
res.send('');
next();
}
});
const cache_tmp_prefix = 'cache:tmp:';
// API 2: set 60 seconds temp cache
server.post('/cache', (req, res, next) => {
if (req.body.raw !== undefined && req.body.raw !== '') {
const cacheKey = crypto.createHash('md5').update(req.body.raw).digest('hex');
const rdKey = cache_tmp_prefix + cacheKey;
rds.set(rdKey, req.body.raw, () => {
rds.expire(rdKey, 60);
});
res.send(cacheKey);
} else {
res.send('');
}
next();
});
// API 3: get temp cache
server.get('/cache/:key', (req, res, next) => {
const rdKey = cache_tmp_prefix + req.params.key;
rds.get(rdKey, (err, cacheVal) => {
if (cacheVal) {
res.send(cacheVal);
} else {
res.send('');
}
next();
});
});
const patternTitle = /<title>(.*?)<\/title>/i;
const patternDesc = /<meta[^<]*?name="description".*?content="(.*?)"[^<]*?>/i;
const patternKeys = /<meta[^<]*?name="keywords".*?content="(.*?)"[^<]*?>/i;
const patternNoJs = /<noscript>(.*?)<\/noscript>/i;
const tplMetaTimestamp = '<meta name="static:time" content="{}">';
// API 4: set page html cache
server.post('/staticpage*', (req, res, next) => {
const siteName = req.header('sp-site-name', '');
if (siteName && req.header('sp-key', 'ALL') === staticPageKey) {
try {
const pageUrl = req.body.pageUrl;
const title = req.body.title; // <= 70 chars
const description = req.body.description; // <= 150 chars
const keywords = req.body.keywords;
let htmlRaw = req.body.htmlRaw; // document.documentElement.outerHTML
if (htmlRaw) {
const headPos = htmlRaw.indexOf('<head>') + 6;
htmlRaw = htmlRaw.slice(0, headPos) +
tplMetaTimestamp.replace('{}', '' + new Date().getTime()) +
htmlRaw.slice(headPos);
if (description) {
if (htmlRaw.search(patternDesc) > 0) {
htmlRaw = htmlRaw.replace(patternDesc, '<meta name="description" content="' + description + '">');
} else {
htmlRaw = htmlRaw.slice(0, headPos) + '<meta name="description" content="' + description + '">' + htmlRaw.slice(headPos);
}
if (htmlRaw.search(patternNoJs) > 0) {
htmlRaw = htmlRaw.replace(patternNoJs, '<noscript>' + description + '</noscript>');
}
}
if (keywords) {
if (htmlRaw.search(patternKeys) > 0) {
htmlRaw = htmlRaw.replace(patternKeys, '<meta name="keywords" content="' + keywords + '">');
} else {
htmlRaw = htmlRaw.slice(0, headPos) + '<meta name="keywords" content="' + keywords + '">' + htmlRaw.slice(headPos);
}
}
if (title) {
if (htmlRaw.search(patternTitle) > 0) {
htmlRaw = htmlRaw.replace(patternTitle, '<title>' + title + '</title>');
} else {
htmlRaw = htmlRaw.slice(0, headPos) + '<title>' + title + '</title>' + htmlRaw.slice(headPos);
}
}
const rdKey = 'SP:' + siteName + ':' + pageUrl;
rds.set(rdKey, htmlRaw, () => {
res.send('success');
next();
});
} else {
res.send('invalid');
next();
}
} catch (e) {
res.send('invalid');
next();
}
} else {
res.send('invalid');
next();
}
});
/* Headers SP
sp-site-name
sp-dynamic
sp-key
*/
// API 5: get page html cache
server.get('/staticpage/*', (req, res, next) => {
const host = req.header('host');
const siteName = req.header('sp-site-name', '');
const toDynamic = req.header('sp-dynamic', host + '/index.html');
const rdKey = 'SP:' + siteName + ':' + req.url.split('/staticpage/')[1];
console.log(rdKey);
rds.get(rdKey, (err, cacheVal) => {
res.header('content-type', 'text/html; charset=utf-8');
if (cacheVal) {
res.end(cacheVal);
next();
} else {
got(toDynamic).then(response => {
res.end(response.body);
next();
}).catch(error => {
if (error.response) {
res.end(error.response.body);
} else {
res.end('invalid');
}
next();
});
}
});
});
// API 6: delete page html cache
server.del('/staticpage/*', (req, res, next) => {
const siteName = req.header('sp-site-name', '');
if (siteName && req.header('sp-key', 'ALL') === staticPageKey) {
const rdKey = 'SP:' + siteName + ':' + req.url.split('/staticpage/')[1];
console.log('del: ' + rdKey);
rds.del(rdKey);
res.send('');
} else {
res.send('invalid');
}
next();
});
// API 7: get all page html cache keys
server.get('/staticpage/keys', (req, res, next) => {
const siteName = req.header('sp-site-name', '');
if (siteName && req.header('sp-key', 'ALL') === staticPageKey) {
const rdKeyPrefix = 'SP:' + siteName + ':*';
rds.keys(rdKeyPrefix, (err, keys) => {
if (err) {
res.send('invalid');
next();
} else {
res.send(keys.map(i => i.substring(rdKeyPrefix.length - 1)));
next();
}
});
} else {
res.send('invalid');
next();
}
});
// TODO 站点基础js更新接口？
server.listen(3068, () => {
console.log('%s listening at %s:', server.name, server.url);
});