gm:イメージ構成のメイン処理

image.js

//モジュール読込
var http = require('http');
var url = require('url');
var gm = require('gm');
var gmcomposite = require('./gmcomposite');
var fs = require('fs');
var argv = require('argv');

//コマンドオプション定義
argv.option([{
  name: 'facebook_id',
  short: 'f',
  type : 'string',
  description :'your facebook_id',
  example: "'script --facebook_id=value' or 'script -f value'"
},
{
  name: 'url',
  short: 'u',
  type: 'string',
  description: 'your picture url',
  example: "'script --url=value or 'script -u value''"
}]);
var config = argv.run();


//画像パス定義
var base_path = './assets/frame.png';
var mask_path = './assets/frame.png';
var down_path = './rslt/download/'+config.options.facebook_id+".jpg";
var convert_path = './rslt/convert/'+config.options.facebook_id+".jpg";
var composite_path = './rslt/composite/'+config.options.facebook_id+'.jpg';
var target_url = url.parse(config.options.url);
target_url.protocol = 'http:';
target_url.path = target_url.pathname;
config.base_path = base_path;
config.mask_path = mask_path;
config.down_path = down_path;
config.convert_path = convert_path;
config.composite_path = composite_path;


/**
 * URLの画像を指定ディレクトリにダウンロード
 * @param {string} target_url:ダウンロード対象のURL
 * @param {string} save_path:保存先
 * @param {string} fn:コールバック関数
 */
function get(target_url, save_path, fn) {
  var callee = arguments.callee;
  var opts = url.parse(target_url);
  var req = (opts.protocol.match(/https/) ? https : http).request({
    host: opts.hostname,
    port: opts.port,
    path: opts.pathname + (opts.search || ''),
    method: 'GET',
  });
  req.on('response', function(res){
    if(res.statusCode == 301 ||res.statusCode == 302) {
      callee(res.headers.location, destPath, fn);
    } else if(res.statusCode == 200) {
      var writableStream = fs.createWriteStream(save_path);
      writableStream.on('error', fn);
      writableStream.on('close', fn);
      res.on('data', function(chunk){
        writableStream.write(chunk, 'binary');
      });
      res.on('end', function(){
        writableStream.end();
      });
    } else {
      fn(new Error('statusCode is ' + res.statusCode));
    }
  });
  req.on('error', fn);
  req.end();
}

/**
 * ダウンロードした画像をマスク合成
 */
get(target_url, down_path, function(err){
  //エラーなら出力して終了
  if(err){console.log(err);return;}

  //画像処理
  gm(down_path)
  .extent(800,800)//リサイズ
  .quality(100)//画質
  .write(convert_path, (function(data){ return function(err){//写真1次加工
    //エラーなら終了
    if(err){console.log(err);return;}
    //合成処理
    gmcomposite(data.base_path, data.convert_path, data.mask_path, data.composite_path, (function(data){ return function(err){
      if(err){console.log(err);return;}
      console.log("create complete !");
    }})(data))
  }})(config))
});