You can set a bucket policy as detailed in this blog post:

http://ariejan.net/2010/12/24/public-readable-amazon-s3-bucket-policy/

---

As per @robbyt&#39;s suggestion, create a bucket policy with the following JSON:
```json
{
    &quot;Version&quot;: &quot;2008-10-17&quot;,
    &quot;Statement&quot;: [
        {
            &quot;Sid&quot;: &quot;AllowPublicRead&quot;,
            &quot;Effect&quot;: &quot;Allow&quot;,
            &quot;Principal&quot;: {
                &quot;AWS&quot;: &quot;*&quot;
            },
            &quot;Action&quot;: [
                &quot;s3:GetObject&quot;
            ],
            &quot;Resource&quot;: [
                &quot;arn:aws:s3:::bucket/*&quot;
            ]
        }
    ]
}
```

**Important**: replace `bucket` in the `Resource` line with the name of your bucket.

Amazon provides a policy generator tool:

https://awspolicygen.s3.amazonaws.com/policygen.html

After that, you can enter the policy requirements for the bucket on the AWS console:

https://console.aws.amazon.com/s3/home

How to pass parameters to `Thread.ThreadStart()` method in C#?

Suppose I have method called &#39;download&#39;

    public void download(string filename)
    {
        // download code
    }

Now I have created one thread in the main method:

    Thread thread = new Thread(new ThreadStart(download(filename));

&gt; error method type expected.

How can I pass parameters to `ThreadStart` with target method with parameters?

How to pass parameters to ThreadStart method in Thread?

I have frequent problem in android view, `Error parsing XML: unbound prefix on Line 2`.

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;LinearLayout android:orientation=&quot;vertical&quot; android:id=&quot;@+id/myScrollLayout&quot; 
    android:layout_width=&quot;fill_parent&quot;  android:layout_height=&quot;wrap_content&quot;&gt;
    	&lt;TextView android:layout_height=&quot;wrap_content&quot; android:layout_width=&quot;fill_parent&quot; 
    	android:text=&quot;Family&quot; android:id=&quot;@+id/Family&quot; 
    	android:textSize=&quot;16px&quot; android:padding=&quot;5px&quot; 
    	android:textStyle=&quot;bold&quot; android:gravity=&quot;center_horizontal&quot;&gt;
    	&lt;/TextView&gt;
    	
    	&lt;ScrollView xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
    	    android:layout_width=&quot;fill_parent&quot; android:layout_height=&quot;wrap_content&quot;
    	    android:orientation=&quot;vertical&quot; android:scrollbars=&quot;vertical&quot;&gt;
    		&lt;LinearLayout android:orientation=&quot;vertical&quot; android:id=&quot;@+id/myMainLayout&quot; 
    		android:layout_width=&quot;fill_parent&quot;  android:layout_height=&quot;wrap_content&quot;&gt;
    		&lt;/LinearLayout&gt;
    	&lt;/ScrollView&gt;
    
    &lt;/LinearLayout&gt;

frequent issues arising in android view, Error parsing XML: unbound prefix

How can I set a bucket in Amazon S3 so all the files are publicly read-only by default?

Make a bucket public in Amazon S3

<p>How can I set a bucket in Amazon S3 so all the files are publicly read-only by default?</p>


Bit confused here, I have an on-demand instance but do I get charged even when I stop the instance?

Do you get charged for a &#39;stopped&#39; instance on EC2?

I have files stored on S3 with a GUID as the key name.

I am using a pre signed URL to download as per [S3 REST API][1]

I store the original file name in my own Database.  When a user clicks to download a file from my web application **I want to return their original file name, but currently all they get is a GUID**. How can I achieve this?

 My web app is in salesforce so I do not have much control to do response.redirects all download the file to the web server then rename it due to governor limitations. 

Is there some HTML redirect, meta refresh, Javascript I can use?  Is there some way to change the download file name for S3 (the only thing I can think of is coping the object to a new name, downloading it, then deleting it). 

I want to avoid creating a bucket per user as we will have a lot of users and still no guarantee each file with in each bucket will have a unique name

Any other solutions?

  [1]: http://docs.amazonwebservices.com/AmazonS3/latest/dev/index.html?RESTAuthentication.html#RESTAuthenticationQueryStringAuth

Amazon S3 Change file download name

Getting the following error message from https://mws.amazonservices.com/:

    &lt;Type&gt;Sender&lt;/Type&gt;
    &lt;Code&gt;SignatureDoesNotMatch&lt;/Code&gt;
    −
    &lt;Message&gt;
    The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details.
    &lt;/Message&gt;

Here is the VB.net code I am using to calculate the request.  I have removed the SecretKey and AWSAccessKeyId for security reasons.

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
            Dim sURL As String = &quot;https://mws.amazonservices.com/&quot;
    
            Dim sRequest As String = &quot;&quot;
            sRequest &amp;= &quot;Acknowledged=&quot; &amp; Server.UrlEncode(&quot;false&quot;)
            sRequest &amp;= &quot;&amp;Action=&quot; &amp; Server.UrlEncode(&quot;GetReportList&quot;)
            sRequest &amp;= &quot;&amp;AWSAccessKeyId=&quot; &amp; Server.UrlEncode(&quot;REMOVED-FOR-SECURITY&quot;)
            sRequest &amp;= &quot;&amp;Marketplace=&quot; &amp; Server.UrlEncode(&quot;REMOVED-FOR-SECURITY&quot;)
            sRequest &amp;= &quot;&amp;Merchant=&quot; &amp; Server.UrlEncode(&quot;REMOVED-FOR-SECURITY&quot;)
            sRequest &amp;= &quot;&amp;SignatureMethod=&quot; &amp; Server.UrlEncode(&quot;HmacSHA256&quot;)
            sRequest &amp;= &quot;&amp;SignatureVersion=&quot; &amp; Server.UrlEncode(&quot;2&quot;)
            sRequest &amp;= &quot;&amp;Timestamp=&quot; &amp; Server.UrlEncode(DateTime.Now.ToString(&quot;yyyy-MM-ddTHH:mm:ssCST&quot;))
            sRequest &amp;= &quot;&amp;Version=&quot; &amp; Server.UrlEncode(&quot;2009-01-01&quot;)
    
            Dim StringToSign As String = &quot;GET\n&quot; &amp; &quot;mws.amazonservices.com\n&quot; &amp; &quot;/\n&quot; &amp; sRequest
            sRequest &amp;= &quot;&amp;Signature=&quot; &amp; Server.UrlEncode(HashString(StringToSign))
    
            Response.Write(&quot;&lt;a href=&quot;&quot;&quot; &amp; sURL &amp; &quot;?&quot; &amp; sRequest &amp; &quot;&quot;&quot;&gt;Click here&lt;/a&gt;&quot;)
    
        End Sub
    
        Public Shared Function HashString(ByVal StringToHash As String) As String
            Dim myEncoder As New System.Text.UTF8Encoding
            Dim Key() As Byte = myEncoder.GetBytes(&quot;REMOVED-FOR-SECURITY&quot;)
            Dim XML() As Byte = myEncoder.GetBytes(StringToHash)
            Dim myHMACSHA256 As New System.Security.Cryptography.HMACSHA256(Key)
            Dim HashCode As Byte() = myHMACSHA256.ComputeHash(XML)
            Return Convert.ToBase64String(HashCode)
        End Function

Amazon MWS - request signature calculated does not match the signature provided

I cannot SSH into my instance - Operation timed out. What could be the reasons why, and what can  I do to resolve it? Rebooting normally takes a long time to take effect, and might just makes things worst

UPDATE: It is not about permissions - i can log in normally just fine. I suspect it might be because of memory issues

Possible reasons for timeout when trying to access EC2 instance

Unless I&#39;m missing something, it seems that none of the APIs I&#39;ve looked at will tell you how many objects are in an `&lt;S3 bucket&gt;/&lt;folder&gt;`. Is there any way to get a count?

How can I tell how many objects I&#39;ve stored in an S3 bucket?

I have a rails application that has multiple models with paperclip attachments that are all uploaded to S3.  This app also has a large test suite that is run quite often. The downside with this is that a ton of files are uploaded to our S3 account on every test run, making the test suite run slowly.  It also slows down development a bit, and requires you to have an internet connection in order to work on the code. 

Is there a reasonable way to set the paperclip storage mechanism based on the Rails environment? Ideally, our test and development environments would use the local filesystem storage, and the production environment would use S3 storage.

I&#39;d also like to extract this logic into a shared module of some kind, since we have several models that will need this behavior. I&#39;d like to avoid a solution like this inside of every model:

    ### We don&#39;t want to do this in our models...
    if Rails.env.production?
      has_attached_file :image, :styles =&gt; {...},
                        :path =&gt; &quot;images/:uuid_partition/:uuid/:style.:extension&quot;,
                        :storage =&gt; :s3,
                        :url =&gt; &#39;:s3_authenticated_url&#39;, # generates an expiring url
                        :s3_credentials =&gt; File.join(Rails.root, &#39;config&#39;, &#39;s3.yml&#39;),
                        :s3_permissions =&gt; &#39;private&#39;,
                        :s3_protocol =&gt; &#39;https&#39;
    else
      has_attached_file :image, :styles =&gt; {...},
                        :storage =&gt; :filesystem
                        # Default :path and :url should be used for dev/test envs.
    end

**Update:** The sticky part is that the attachment&#39;s `:path` and `:url` options need to differ depending on which storage system is being used.

Any advice or suggestions would be greatly appreciated! :-)

How can I set paperclip&#39;s storage mechanism based on the current Rails environment?

I am just starting to think about how api keys and secret keys work.  Just 2 days ago I signed up for Amazon S3 and installed the [S3Fox Plugin](http://www.s3fox.net/).  They asked me for both my Access Key and Secret Access Key, both of which require me to login to access.

So I&#39;m wondering, if they&#39;re asking me for my secret key, they must be storing it somewhere right?  Isn&#39;t that basically the same thing as asking me for my credit card numbers or password and storing that in their own database?

How are secret keys and api keys supposed to work?  How secret do they need to be?  Are these applications that use the secret keys storing it somehow?


How do API Keys and Secret Keys work? Would it be secure if I have to pass my API and secret keys to another application?

I saw a few other questions regarding this without any real answers or information (or so it appeared).

I have an image here:  
http://furniture.retailcatalog.us/products/2061/6262u9665.jpg

Which is redirecting to:  
http://furniture.retailcatalog.us.s3.amazonaws.com/products/2061/6262u9665.jpg

I need it to be (https):  
https://furniture.retailcatalog.us/products/2061/6262u9665.jpg

So I installed a wildcard ssl on retailcatalog.us (we have other subdomains), but it wasn&#39;t working. I went to check  
https://furniture.retailcatalog.us.s3.amazonaws.com/products/2061/6262u9665.jpg

And it wasn&#39;t working, which means on the Amazon S3 website itself the https wasn&#39;t working. 

How do I make this work?


Content Type	Original Author	Original Content on Stackoverflow
Question	Victor	View Question on Stackoverflow
Solution 1 - Amazon Web-Services	Intrications	View Answer on Stackoverflow
Solution 2 - Amazon Web-Services	evaneus	View Answer on Stackoverflow

Make a bucket public in Amazon S3

Amazon Web-Services Problem Overview

Amazon Web-Services Solutions

Solution 1 - Amazon Web-Services

Solution 2 - Amazon Web-Services

frequent issues arising in android view, Error parsing XML: unbound prefix

How to pass parameters to ThreadStart method in Thread?

Attributions