hackernews2nntp/lib/message.js

Post Hacker News Stories & Comments to an NNTP Server

// Generated by CoffeeScript 1.8.0
(function() {
  var Message, Mustache, Q, crypto, fs, json_schema, mimelib, os, path, spawn;

  fs = require('fs');

  path = require('path');

  crypto = require('crypto');

  os = require('os');

  spawn = require('child_process').spawn;

  Mustache = require('mustache');

  json_schema = require('jjv')();

  Q = require('q');

  mimelib = require('mimelib');

  Message = (function() {
    Message.NEWSGROUP_DEFAULT = 'news.ycombinator';

    Message.SCHEMA = JSON.parse(fs.readFileSync(path.join(__dirname, 'schema.json')).toString());

    Message.TemplateGet = function(name, alt_dir) {
      var dirs, e, err, idx, result, _i, _len;
      if (alt_dir == null) {
        alt_dir = '';
      }
      dirs = [path.resolve(__dirname, '..', 'template')];
      if (alt_dir) {
        dirs.unshift(alt_dir);
      }
      result = null;
      err = null;
      for (_i = 0, _len = dirs.length; _i < _len; _i++) {
        idx = dirs[_i];
        try {
          result = fs.readFileSync(path.join(idx, "" + name + ".txt")).toString();
          err = null;
          break;
        } catch (_error) {
          e = _error;
          err = e;
        }
      }
      if (!err) {
        return result;
      }
      throw err;
    };

    function Message(json_data, parts) {
      var err, idx, _i, _len, _ref;
      this.json_data = json_data;
      this.parts = parts != null ? parts : [];
      this.opt = {};
      _ref = this.parts.concat(this.json_data);
      for (_i = 0, _len = _ref.length; _i < _len; _i++) {
        idx = _ref[_i];
        err = json_schema.validate(Message.SCHEMA, idx);
        if (err) {
          throw new Error('invalid json input: ' + JSON.stringify(err));
        }
      }
    }

    Message.prototype.id = function() {
      return "<" + this.json_data.id + "@news.ycombinator.com>";
    };

    Message.prototype.parent_id = function() {
      if (!this.json_data.parent) {
        return '';
      }
      return "<" + this.json_data.parent + "@news.ycombinator.com>";
    };

    Message.prototype.date = function() {
      var d;
      d = new Date(this.json_data.time * 1000);
      return d.toUTCString();
    };

    Message.prototype.content_id = function() {
      var r;
      r = "" + this.json_data.time + "_" + (crypto.pseudoRandomBytes(8).toString('hex')) + "@" + (os.hostname());
      return {
        global: "<" + r + ">",
        text: "<text_" + r + ">",
        html: "<html_" + r + ">"
      };
    };

    Message.prototype.headers = function() {
      return {
        newsgroup: Message.NEWSGROUP_DEFAULT,
        message_id: this.id(),
        boundary: crypto.pseudoRandomBytes(16).toString('hex'),
        parent_msgid: this.parent_id(),
        content_id: this.content_id(),
        permalink: "https://news.ycombinator.com/item?id=" + this.json_data.id,
        from: "" + this.json_data.by + " <" + this.json_data.by + "@example.com>",
        date: this.date(),
        path: os.hostname(),
        profile: "https://news.ycombinator.com/user?id=" + this.json_data.by,
        subject: !this.json_data.title ? '' : mimelib.encodeMimeWord(this.json_data.title)
      };
    };

    Message.HTML_filter = function(html) {
      var deferred, stderr, text, w3m;
      deferred = Q.defer();
      text = '';
      stderr = '';
      if ((html == null) || html === "") {
        deferred.resolve(text);
        return deferred.promise;
      }
      w3m = spawn('w3m', ['-T', 'text/html', '-dump', '-I', 'UTF-8', '-O', 'UTF-8', '-cols', '72', '-no-graph']);
      w3m.on('error', function(err) {
        return deferred.reject(new Error("w3m exec failed: " + err.message));
      });
      w3m.stdout.on('data', function(data) {
        return text += data;
      });
      w3m.stderr.on('data', function(data) {
        return stderr += data;
      });
      w3m.on('close', function(code) {
        if (code === 0) {
          return deferred.resolve(text);
        } else {
          return deferred.reject(new Error("w3m failed w/ exit code " + code + "\nw3m stderr: " + stderr));
        }
      });
      w3m.stdin.write(html);
      w3m.stdin.end();
      return deferred.promise;
    };

    Message.prototype.polparts_collect = function() {
      var deferred, idx, item, parts, _i, _len, _ref;
      deferred = Q.defer();
      if (this.parts.length === 0) {
        deferred.resolve([]);
        return deferred.promise;
      }
      parts = [];
      idx = 0;
      _ref = this.parts;
      for (_i = 0, _len = _ref.length; _i < _len; _i++) {
        item = _ref[_i];
        Message.HTML_filter(item.text).then((function(_this) {
          return function(r) {
            ++idx;
            parts.push(r.trim());
            if (idx === _this.parts.length) {
              return deferred.resolve(parts);
            }
          };
        })(this));
      }
      return deferred.promise;
    };

    Message.prototype.render = function(_tdd_hash) {
      var json;
      json = JSON.parse(JSON.stringify(this.json_data));
      json.mail = this.headers();
      if (this.json_data.type === 'poll') {
        return this.polparts_collect().then((function(_this) {
          return function(r) {
            json.mail.polparts = r;
            if (_tdd_hash) {
              _tdd_hash.polparts = r;
            }
            return Mustache.render(Message.TemplateGet(json.type, _this.opt.alt_dir), json);
          };
        })(this));
      } else {
        return Message.HTML_filter(this.json_data.text).then((function(_this) {
          return function(r) {
            json.mail.body_text = r.trim();
            if (_tdd_hash) {
              _tdd_hash.body_text = r.trim();
            }
            return Mustache.render(Message.TemplateGet(json.type, _this.opt.alt_dir), json);
          };
        })(this));
      }
    };

    Message.prototype.toString = function() {
      return this.render();
    };

    return Message;

  })();

  module.exports = Message;

}).call(this);