如何使用Node.js的模塊中的一些文件

Question

這是我的第三方節點JS模塊：

var knox = require('knox') 
    , Resource = require('deployd/lib/resource') 
    , httpUtil = require('deployd/lib/util/http') 
    , formidable = require('formidable') 
    , fs = require('fs') 
    , util = require('util') 
    , path = require('path'); 

function S3Bucket(name, options) { 
    Resource.apply(this, arguments); 
    if (this.config.key && this.config.secret && this.config.bucket) { 
    this.client = knox.createClient({ 
     key: this.config.key 
     , secret: this.config.secret 
     , bucket: this.config.bucket 
    }); 
    } 
} 
util.inherits(S3Bucket, Resource); 
module.exports = S3Bucket; 
S3Bucket.label = "S3 Bucket"; 

S3Bucket.prototype.clientGeneration = true; 

S3Bucket.events = ["upload", "get", "delete"]; 
S3Bucket.basicDashboard = { 
    settings: [{ 
     name: 'bucket' 
    , type: 'string' 
    }, { 
     name: 'key' 
    , type: 'string' 
    }, { 
     name: 'secret' 
    , type: 'string' 
    }] 
}; 

S3Bucket.prototype.handle = function (ctx, next) { 
    var req = ctx.req 
    , bucket = this 
    , domain = {url: ctx.url}; 

    if (!this.client) return ctx.done("Missing S3 configuration!"); 

    if (req.method === "POST" && !req.internal && req.headers['content-type'].indexOf('multipart/form-data') === 0) { 
    var form = new formidable.IncomingForm(); 
    var remaining = 0; 
    var files = []; 
    var error; 

    var uploadedFile = function(err) { 
     if (err) { 
     error = err; 
     return ctx.done(err); 
     } else if (!err) { 
     remaining--; 
     if (remaining <= 0) { 
      if (req.headers.referer) { 
      httpUtil.redirect(ctx.res, req.headers.referer || '/'); 
      } else { 
      ctx.done(null, files); 
      } 
     } 
     } 
    }; 

    form.parse(req) 
     .on('file', function(name, file) { 
     remaining++; 

     if (bucket.events.upload) { 
      bucket.events.upload.run(ctx, {url: ctx.url, fileSize: file.size, fileName: file.filename}, function(err) { 
      if (err) return uploadedFile(err); 
      bucket.uploadFile(file.filename, file.size, file.mime, fs.createReadStream(file.path), uploadedFile); 
      }); 
     } else { 
      bucket.uploadFile(file.filename, file.size, file.mime, fs.createReadStream(file.path), uploadedFile); 
     } 
     }) 
     .on('error', function(err) { 
     ctx.done(err); 
     error = err; 
     }); 
    req.resume(); 
    return; 
    } 

    if (req.method === "POST" || req.method === "PUT") { 

    domain.fileSize = ctx.req.headers['content-length']; 
    domain.fileName = path.basename(ctx.url); 

    if (this.events.upload) { 
     this.events.upload.run(ctx, domain, function(err) { 
     if (err) return ctx.done(err); 
     bucket.upload(ctx, next); 
     }); 
    } else { 
     this.upload(ctx, next); 
    } 

    } else if (req.method === "GET") { 
    if (ctx.res.internal) return next(); // This definitely has to be HTTP. 

    if (this.events.get) { 
     this.events.get.run(ctx, domain, function(err) { 
     if (err) return ctx.done(err); 
     bucket.get(ctx, next); 
     }); 
    } else { 
     this.get(ctx, next); 
    } 

    } else if (req.method === "DELETE") { 

    if (this.events['delete']) { 
     this.events['delete'].run(ctx, domain, function(err) { 
     if (err) return ctx.done(err); 
     bucket.del(ctx, next); 
     }); 
    } else { 
     this.del(ctx, next); 
    } 
    } else { 
    next(); 
    } 
}; 

S3Bucket.prototype.uploadFile = function(filename, filesize, mime, stream, fn) { 
    var bucket = this; 

    var headers = { 
     'Content-Length': filesize 
    , 'Content-Type': mime 
    }; 

    this.client.putStream(stream, filename, headers, function(err, res) { 
    if (err) return ctx.done(err); 
    if (res.statusCode !== 200) { 
     bucket.readStream(res, function(err, message) { 
     fn(err || message); 
     }); 
    } else { 
     fn(); 
    } 
    }); 
}; 

S3Bucket.prototype.upload = function(ctx, next) { 
    var bucket = this 
    , req = ctx.req; 

    var headers = { 
     'Content-Length': req.headers['content-length'] 
    , 'Content-Type': req.headers['content-type'] 
    }; 

    this.client.putStream(req, ctx.url, headers, function(err, res) { 
    if (err) return ctx.done(err); 
    if (res.statusCode !== 200) { 
     bucket.readStream(res, function(err, message) { 
     ctx.done(err || message); 
     }); 
    } else { 
     ctx.done(); 
    } 
    }); 
    req.resume(); 
}; 

S3Bucket.prototype.get = function(ctx, next) { 
    var bucket = this; 
    var url = 'https://s3.amazonaws.com/' + this.config.bucket + ctx.url; 

    httpUtil.redirect(ctx.res, url); 
}; 

S3Bucket.prototype.del = function(ctx, next) { 
    var bucket = this; 

    this.client.deleteFile(ctx.url, function(err, res) { 
    if (err) ctx.done(err); 
    if (res.statusCode !== 200) { 
     bucket.readStream(res, function(err, message) { 
     ctx.done(err || message); 
     }); 
    } else { 
     ctx.done(); 
    } 
    }); 
}; 

S3Bucket.prototype.readStream = function(stream, fn) { 
    var buffer = ''; 
    stream.on('data', function(data) { 
    buffer += data; 
    }).on('end', function() { 
    fn(null, buffer); 
    }).on('error', function(err) { 
    fn(err); 
    }); 
}; 

內s3-amazon-aws文件夾，因此我做var s3bucket = require('s3-amazon-aws');

但是，現在如果我有打電話給模塊的句柄功能，我該怎麼做？另外它需要2個參數，如ctx，next。我如何獲得這些參數？

任何幫助，將不勝感激。

Answer 1

該模塊導出S3Bucket構造函數。用它來創建一個新的對象。然後你可以在這個對象上調用handle()方法（因爲它是對象原型的一部分）。

var S3Bucket = require('s3-amazon-aws'); 
var bucket = new S3Bucket(name, options); 
bucket.handle(ctx, next) 

關於各種參數，您需要閱讀庫的文檔。