1. module koa-session
   1. object koa-session.util
2. module koa-session.util
   1. function koa-session.util.decode (string)
   2. function koa-session.util.encode (body)
   3. function koa-session.util.hash (sess)

module koa-session

module koa-session.util

function koa-session.util.decode (string)

• description and source-code

  decode(string) {
    const body = new Buffer(string, 'base64').toString('utf8');
    const json = JSON.parse(body);
    return json;
  }

• example usage

  ...
    this.create();
    return;
  }
  
  let json;
  debug('parse %s', cookie);
  try {
    json = opts.decode(cookie);
  } catch (err) {
    // backwards compatibility:
    // create a new session if parsing fails.
    // new Buffer(string, 'base64') does not seem to crash
    // when `string` is not base64-encoded.
    // but `JSON.parse(string)` will crash.
    debug('decode %j error: %s', cookie, err);
  ...

function koa-session.util.encode (body)

• description and source-code

  encode(body) {
    body = JSON.stringify(body);
    return new Buffer(body).toString('base64');
  }

• example usage

  ...
        await this.store.set(externalKey, json, maxAge);
        this.ctx.cookies.set(key, externalKey, opts);
        return;
      }
  
      // save to cookie
      debug('save %j to cookie', json);
      json = opts.encode(json);
      debug('save %s', json);
  
      this.ctx.cookies.set(key, json, opts);
    }
  }
  
  module.exports = ContextSession;
  ...

function koa-session.util.hash (sess)

• description and source-code

  hash(sess) {
    return crc(JSON.stringify(sess));
  }

• example usage

  ...
      // create a new `externalKey`
      this.create();
      return;
    }
  
    // create with original `externalKey`
    this.create(json, externalKey);
    this.prevHash = util.hash(this.session.toJSON());
  }
  
  /**
   * init session from cookie
   * @api private
   */
  ...