问Google云存储Javascript使用

EN

    function checkAuth() {
  gapi.auth.authorize({
    client_id: clientId,
    scope: scopes,
    immediate: true
  }, handleAuthResult);
}

var http = require('http');
var fs = require('fs');
var crypto = require('crypto');
var express = require('express');
var app = express();
var p12ToPem = require("./node_modules/p12-to-pem/p12ToPem.js");
var p12File = fs.readFileSync("./KEY.p12");
var pemKey = p12ToPem(p12File, "notasecret");
 var policyJson={"expiration": "2050-06-16T11:11:11Z",
"conditions": [["starts-with", "$key", "" ],
{"acl": "bucket-owner-read" },
{"bucket": "my-bucket'name"},
{"success_action_redirect":"http://www.example.com/success_notification.html" },
 ["eq", "$Content-Type", "image/jpeg" ],
 ["content-length-range", 0, 1000000]
 ]
};
var policyJson64 = new Buffer(''+policyJson).toString('base64');
var sign = crypto.createSign('RSA-SHA256');
sign.update(policyJson64);
var sig = sign.sign(pemKey, 'base64')
console.log("policyJson64:"+policyJson64);
console.log("sig:"+sig);

  <form action="http://my-bucket-name.storage.googleapis.com" method="post" enctype="multipart/form-data">
<input type="text" name="key" value="">
<input type="hidden" name="bucket" value="my-bucket-name">
<input type="hidden" name="Content-Type" value="image/jpeg">
<input type="hidden" name="GoogleAccessId" value="884257827820-so77htet9tafrcjjp83m7api9lh12qsn@developer.gserviceaccount.com">
<input type="hidden" name="acl" value="bucket-owner-read">
<input type="hidden" name="success_action_redirect" value="http://www.example.com/success_notification.html">
<input type="hidden" name="policy" value="DONT KNOW WHAT TO PUT HERE">
<input type="hidden" name="signature" value="NEITHER HERE">
<input name="file" type="file">
<input type="submit" value="Upload">

<Error>
<Code>SignatureDoesNotMatch</Code>
<Message>
The request signature we calculated does not match the signature you provided. Check your Google secret key and signing method.
</Message>
<StringToSign>
a/vDHoeJ1jIZibjgLnS/ZfMftmyz8IaISJiVt1b2wDNbDjnSR+0HyEDW9/Lew7ufMjU9xdtX/Uld06IJbeYz3OWGHnH4osJNS614RoDVd7lq2qft+bSCqYPtkagJiUWs9SNOPvuQzISthqloPQOwJ1LLXHYmV52c73OpexAnSR4=
</StringToSign>
</Error>