Files: 57449ef94aae666b453579c78a553613cb1e4c8a / index.js
10947 bytesRaw
| 1 | var fs = require('fs') |
| 2 | var http = require('http') |
| 3 | var qs = require('querystring') |
| 4 | var path = require('path') |
| 5 | var crypto = require('crypto') |
| 6 | var cat = require('pull-cat') |
| 7 | var pull = require('pull-stream') |
| 8 | var paramap = require('pull-paramap') |
| 9 | var marked = require('ssb-marked') |
| 10 | var sort = require('ssb-sort') |
| 11 | var toPull = require('stream-to-pull-stream') |
| 12 | var memo = require('asyncmemo') |
| 13 | var lru = require('lrucache') |
| 14 | var htime = require('human-time') |
| 15 | var emojis = require('emoji-named-characters') |
| 16 | var serveEmoji = require('emoji-server')() |
| 17 | |
| 18 | var emojiDir = path.join(require.resolve('emoji-named-characters'), '../pngs') |
| 19 | var appHash = hash([fs.readFileSync(__filename)]) |
| 20 | |
| 21 | var urlIdRegex = /^(?:\/(([%&])[A-Za-z0-9\/+]{43}=\.sha256)(?:\.([^?]*))?|(\/.*?))(?:\?(.*))?$/ |
| 22 | |
| 23 | function MdRenderer(opts) { |
| 24 | marked.Renderer.call(this, {}) |
| 25 | this.opts = opts |
| 26 | } |
| 27 | MdRenderer.prototype = new marked.Renderer() |
| 28 | |
| 29 | MdRenderer.prototype.urltransform = function (href) { |
| 30 | switch (href && href[0]) { |
| 31 | case '%': return this.opts.msg_base + href |
| 32 | case '@': return this.opts.feed_base + href |
| 33 | case '&': return this.opts.blob_base + href |
| 34 | } |
| 35 | return marked.Renderer.prototype.urltransform.call(this, href) |
| 36 | } |
| 37 | |
| 38 | MdRenderer.prototype.image = function (href, title, text) { |
| 39 | return '<img src="' + this.opts.img_base + escape(href) + '"' |
| 40 | + ' alt="' + text + '"' |
| 41 | + (title ? ' title="' + title + '"' : '') |
| 42 | + (this.options.xhtml ? '/>' : '>') |
| 43 | }; |
| 44 | |
| 45 | function renderEmoji(emoji) { |
| 46 | var opts = this.renderer.opts |
| 47 | return emoji in emojis ? |
| 48 | '<img src="' + opts.emoji_base + escape(emoji) + '.png"' |
| 49 | + ' alt=":' + escape(emoji) + ':"' |
| 50 | + ' title=":' + escape(emoji) + ':"' |
| 51 | + ' class="ssb-emoji" height="16" width="16">' |
| 52 | : ':' + emoji + ':' |
| 53 | } |
| 54 | |
| 55 | exports.name = 'viewer' |
| 56 | exports.manifest = {} |
| 57 | exports.version = require('./package').version |
| 58 | |
| 59 | exports.init = function (sbot, config) { |
| 60 | var conf = config.viewer || {} |
| 61 | var port = conf.port || 8807 |
| 62 | var host = conf.host || config.host || '::' |
| 63 | |
| 64 | var base = conf.base || '/' |
| 65 | var defaultOpts = { |
| 66 | msg_base: conf.msg_base || base, |
| 67 | feed_base: conf.feed_base || '#', |
| 68 | blob_base: conf.blob_base || base, |
| 69 | img_base: conf.img_base || base, |
| 70 | emoji_base: conf.emoji_base || (base + 'emoji/'), |
| 71 | } |
| 72 | |
| 73 | var getMsg = memo({cache: lru(100)}, getMsgWithValue, sbot) |
| 74 | var getAbout = memo({cache: lru(100)}, require('./lib/about'), sbot) |
| 75 | |
| 76 | http.createServer(serve).listen(port, host, function () { |
| 77 | console.log('[viewer] Listening on http://' + host + ':' + port) |
| 78 | }) |
| 79 | |
| 80 | function serve(req, res) { |
| 81 | if (req.method !== 'GET' && req.method !== 'HEAD') { |
| 82 | return respond(res, 405, 'Method must be GET or HEAD') |
| 83 | } |
| 84 | var m = urlIdRegex.exec(req.url) |
| 85 | switch (m[2]) { |
| 86 | case '&': return serveBlob(req, res, sbot, m[1]) |
| 87 | case '%': return serveId(req, res, m[1], m[3], m[5]) |
| 88 | default: return servePath(req, res, m[4]) |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | function serveId(req, res, id, ext, query) { |
| 93 | var q = query ? qs.parse(query) : {} |
| 94 | var includeRoot = !('noroot' in q) |
| 95 | var base = q.base || conf.base |
| 96 | var baseToken |
| 97 | if (!base) { |
| 98 | if (ext === 'js') base = baseToken = '__BASE_' + Math.random() + '_' |
| 99 | else base = '/' |
| 100 | } |
| 101 | var opts = { |
| 102 | base: base, |
| 103 | base_token: baseToken, |
| 104 | msg_base: q.msg_base || conf.msg_base || base, |
| 105 | feed_base: q.feed_base || conf.feed_base || '#', |
| 106 | blob_base: q.blob_base || conf.blob_base || base, |
| 107 | img_base: q.img_base || conf.img_base || base, |
| 108 | emoji_base: q.emoji_base || conf.emoji_base || (base + 'emoji/'), |
| 109 | } |
| 110 | opts.marked = { |
| 111 | gfm: true, |
| 112 | mentions: true, |
| 113 | tables: true, |
| 114 | breaks: true, |
| 115 | pedantic: false, |
| 116 | sanitize: true, |
| 117 | smartLists: true, |
| 118 | smartypants: false, |
| 119 | emoji: renderEmoji, |
| 120 | renderer: new MdRenderer(opts) |
| 121 | } |
| 122 | |
| 123 | var format = formatMsgs(id, ext, opts) |
| 124 | if (format === null) return respond(res, 415, 'Invalid format') |
| 125 | |
| 126 | pull( |
| 127 | sbot.links({dest: id, values: true, rel: 'root'}), |
| 128 | includeRoot && prepend(getMsg, id), |
| 129 | pull.unique('key'), |
| 130 | pull.collect(function (err, links) { |
| 131 | if (err) return respond(res, 500, err.stack || err) |
| 132 | var etag = hash(sort.heads(links).concat(appHash, ext, qs)) |
| 133 | if (req.headers['if-none-match'] === etag) return respond(res, 304) |
| 134 | res.writeHead(200, { |
| 135 | 'Content-Type': ctype(ext), |
| 136 | 'etag': etag |
| 137 | }) |
| 138 | pull( |
| 139 | pull.values(sort(links)), |
| 140 | paramap(addAuthorAbout, 8), |
| 141 | format, |
| 142 | toPull(res, function (err) { |
| 143 | if (err) console.error('[viewer]', err) |
| 144 | }) |
| 145 | ) |
| 146 | }) |
| 147 | ) |
| 148 | } |
| 149 | |
| 150 | function addAuthorAbout(msg, cb) { |
| 151 | getAbout(msg.value.author, function (err, about) { |
| 152 | if (err) return cb(err) |
| 153 | msg.author = about |
| 154 | cb(null, msg) |
| 155 | }) |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | function serveBlob(req, res, sbot, id) { |
| 160 | if (req.headers['if-none-match'] === id) return respond(res, 304) |
| 161 | sbot.blobs.has(id, function (err, has) { |
| 162 | if (err && /^invalid/.test(err.message)) return respond(400, err.message) |
| 163 | if (err) return respond(500, err.message || err) |
| 164 | if (!has) return respond(404, 'Not found') |
| 165 | res.writeHead(200, { |
| 166 | 'Cache-Control': 'public, max-age=315360000', |
| 167 | 'etag': id |
| 168 | }) |
| 169 | pull( |
| 170 | sbot.blobs.get(id), |
| 171 | toPull(res, function (err) { |
| 172 | if (err) console.error('[viewer]', err) |
| 173 | }) |
| 174 | ) |
| 175 | }) |
| 176 | } |
| 177 | |
| 178 | function getMsgWithValue(sbot, id, cb) { |
| 179 | sbot.get(id, function (err, value) { |
| 180 | if (err) return cb(err) |
| 181 | cb(null, {key: id, value: value}) |
| 182 | }) |
| 183 | } |
| 184 | |
| 185 | function escape(str) { |
| 186 | return String(str) |
| 187 | .replace(/&/g, '&') |
| 188 | .replace(/</g, '<') |
| 189 | .replace(/>/g, '>') |
| 190 | .replace(/"/g, '"') |
| 191 | } |
| 192 | |
| 193 | function respond(res, status, message) { |
| 194 | res.writeHead(status) |
| 195 | res.end(message) |
| 196 | } |
| 197 | |
| 198 | function ctype(name) { |
| 199 | switch (name && /[^.\/]*$/.exec(name)[0] || 'html') { |
| 200 | case 'html': return 'text/html' |
| 201 | case 'js': return 'text/javascript' |
| 202 | case 'css': return 'text/css' |
| 203 | case 'json': return 'application/json' |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | function servePath(req, res, url) { |
| 208 | switch (url) { |
| 209 | case '/robots.txt': return res.end('User-agent: *') |
| 210 | } |
| 211 | var m = /^(\/?[^\/]*)(\/.*)?$/.exec(url) |
| 212 | switch (m[1]) { |
| 213 | case '/static': return serveStatic(req, res, m[2]) |
| 214 | case '/emoji': return serveEmoji(req, res, m[2]) |
| 215 | } |
| 216 | return respond(res, 404, 'Not found') |
| 217 | } |
| 218 | |
| 219 | function ifModified(req, lastMod) { |
| 220 | var ifModSince = req.headers['if-modified-since'] |
| 221 | if (!ifModSince) return false |
| 222 | var d = new Date(ifModSince) |
| 223 | return d && Math.floor(d/1000) >= Math.floor(lastMod/1000) |
| 224 | } |
| 225 | |
| 226 | function serveStatic(req, res, file) { |
| 227 | serveFile(req, res, path.join(__dirname, 'static', file)) |
| 228 | } |
| 229 | |
| 230 | function serveFile(req, res, file) { |
| 231 | fs.stat(file, function (err, stat) { |
| 232 | if (err && err.code === 'ENOENT') return respond(res, 404, 'Not found') |
| 233 | if (err) return respond(res, 500, err.stack || err) |
| 234 | if (!stat.isFile()) return respond(res, 403, 'May only load files') |
| 235 | if (ifModified(req, stat.mtime)) return respond(res, 304, 'Not modified') |
| 236 | res.writeHead(200, { |
| 237 | 'Content-Type': ctype(file), |
| 238 | 'Content-Length': stat.size, |
| 239 | 'Last-Modified': stat.mtime.toGMTString() |
| 240 | }) |
| 241 | fs.createReadStream(file).pipe(res) |
| 242 | }) |
| 243 | } |
| 244 | |
| 245 | function prepend(fn, arg) { |
| 246 | return function (read) { |
| 247 | return function (abort, cb) { |
| 248 | if (fn && !abort) { |
| 249 | var _fn = fn |
| 250 | fn = null |
| 251 | return _fn(arg, function (err, value) { |
| 252 | if (err) return read(err, function (err) { |
| 253 | cb(err || true) |
| 254 | }) |
| 255 | cb(null, value) |
| 256 | }) |
| 257 | } |
| 258 | read(abort, cb) |
| 259 | } |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | function formatMsgs(id, ext, opts) { |
| 264 | switch (ext || 'html') { |
| 265 | case 'html': return pull(renderThread(opts), wrapPage(id)) |
| 266 | case 'js': return pull(renderThread(opts), wrapJSEmbed(opts)) |
| 267 | case 'json': return wrapJSON() |
| 268 | default: return null |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | function wrap(before, after) { |
| 273 | return function (read) { |
| 274 | return cat([pull.once(before), read, pull.once(after)]) |
| 275 | } |
| 276 | } |
| 277 | |
| 278 | function renderThread(opts) { |
| 279 | return pull( |
| 280 | pull.map(renderMsg.bind(this, opts)), |
| 281 | wrap('<div class="ssb-thread">', '</div>') |
| 282 | ) |
| 283 | } |
| 284 | |
| 285 | function wrapPage(id) { |
| 286 | return wrap('<!doctype html><html><head>' |
| 287 | + '<meta charset=utf-8>' |
| 288 | + '<title>' + id + '</title>' |
| 289 | + '<meta name=viewport content="width=device-width,initial-scale=1">' |
| 290 | + '<link rel=stylesheet href="/static/base.css">' |
| 291 | + '<link rel=stylesheet href="/static/nicer.css">' |
| 292 | + '</head><body>', |
| 293 | '</body></html>' |
| 294 | ) |
| 295 | } |
| 296 | |
| 297 | function wrapJSON() { |
| 298 | var first = true |
| 299 | return pull( |
| 300 | pull.map(JSON.stringify), |
| 301 | join(','), |
| 302 | wrap('[', ']') |
| 303 | ) |
| 304 | } |
| 305 | |
| 306 | function wrapJSEmbed(opts) { |
| 307 | return pull( |
| 308 | wrap('<link rel=stylesheet href="' + opts.base + 'static/base.css">', ''), |
| 309 | pull.map(docWrite), |
| 310 | opts.base_token && rewriteBase(new RegExp(opts.base_token, 'g')) |
| 311 | ) |
| 312 | } |
| 313 | |
| 314 | |
| 315 | function rewriteBase(token) { |
| 316 | // detect the origin of the script and rewrite the js/html to use it |
| 317 | return pull( |
| 318 | replace(token, '" + SSB_VIEWER_ORIGIN + "/'), |
| 319 | wrap('var SSB_VIEWER_ORIGIN = (function () {' |
| 320 | + 'var scripts = document.getElementsByTagName("script")\n' |
| 321 | + 'var script = scripts[scripts.length-1]\n' |
| 322 | + 'if (!script) return location.origin\n' |
| 323 | + 'return script.src.replace(/\\/%.*$/, "")\n' |
| 324 | + '}())\n', '') |
| 325 | ) |
| 326 | } |
| 327 | |
| 328 | function join(delim) { |
| 329 | var first = true |
| 330 | return pull.map(function (val) { |
| 331 | if (!first) return delim + String(val) |
| 332 | first = false |
| 333 | return val |
| 334 | }) |
| 335 | } |
| 336 | |
| 337 | function replace(re, rep) { |
| 338 | return pull.map(function (val) { |
| 339 | return String(val).replace(re, rep) |
| 340 | }) |
| 341 | } |
| 342 | |
| 343 | function docWrite(str) { |
| 344 | return 'document.write(' + JSON.stringify(str) + ')\n' |
| 345 | } |
| 346 | |
| 347 | function hash(arr) { |
| 348 | return arr.reduce(function (hash, item) { |
| 349 | return hash.update(String(item)) |
| 350 | }, crypto.createHash('sha256')).digest('base64') |
| 351 | } |
| 352 | |
| 353 | function renderMsg(opts, msg) { |
| 354 | var c = msg.value.content || {} |
| 355 | var name = encodeURIComponent(msg.key) |
| 356 | return '<div class="ssb-message" id="' + name + '">' |
| 357 | + '<img class="ssb-avatar-image" alt=""' |
| 358 | + ' src="' + opts.img_base + escape(msg.author.image) + '"' |
| 359 | + ' height="32" width="32">' |
| 360 | + '<a class="ssb-avatar-name"' |
| 361 | + ' href="' + opts.feed_base + escape(msg.value.author) + '"' |
| 362 | + '>' + msg.author.name + '</a>' |
| 363 | + msgTimestamp(msg, name) |
| 364 | + (c.type === 'post' ? renderPost(opts, c) : renderDefault(c)) |
| 365 | + '</div>' |
| 366 | } |
| 367 | |
| 368 | function msgTimestamp(msg, name) { |
| 369 | var date = new Date(msg.value.timestamp) |
| 370 | return '<time class="ssb-timestamp" datetime="' + date.toISOString() + '">' |
| 371 | + '<a href="#' + name + '">' |
| 372 | + formatDate(date) + '</a></time>' |
| 373 | } |
| 374 | |
| 375 | function formatDate(date) { |
| 376 | // return date.toISOString().replace('T', ' ') |
| 377 | return htime(date) |
| 378 | } |
| 379 | |
| 380 | function renderPost(opts, c) { |
| 381 | return '<div class="ssb-post">' + marked(c.text, opts.marked) + '</div>' |
| 382 | } |
| 383 | |
| 384 | function renderDefault(c) { |
| 385 | return '<pre>' + JSON.stringify(c, 0, 2) + '</pre>' |
| 386 | } |
| 387 |
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