c# code 128 font Figure 9.2 Validation of the authorization key when the signature matches the Authorization header in C#.NET

Maker Code 128B in C#.NET Figure 9.2 Validation of the authorization key when the signature matches the Authorization header

Figure 9.2 Validation of the authorization key when the signature matches the Authorization header
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Tampered request
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Uploading and downloading BLOBs
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List storage account containers Uri: http://127.0.0.1:10000/devstoreaccount2 comp=list x-ms-date: Fri, 03 Jul 2009 19:22:17 GMT x-ms-version: 2009-04-14 Authorization: SharedKey devstoreaccount1:J5xkbSz7/7Xf8sCNY3RJlzyUEfnj1SJ3cclBNpDzsq4= 400 (Bad request) BLOB storage service Generates authorization key from request Authorization: SharedKey devstoreaccount2:y0iAUPJEWY7T4tLDeSQOjsd6r61bat09P7VU1Am2apE=
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Figure 9.3 Validation result when the signature doesn t match the Authorization header. The server generates a different authorization key and the request is denied.
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were to intercept your previous request, then the generated Authorization header server-side would change and the request would be denied. Figure 9.3 shows the validation process between the client and the BLOB storage service when the original request from figure 9.2 has been tampered with. In figure 9.3, we ve tampered with the original request from figure 9.2 to return any containers from devstoreaccount2. Notice that the server generated a different authorization key from the tampered request and therefore the server returns a 400 response code (Bad Request). Now that you understand how the REST API authentication process works, take a break and have a quick beer. Just think, if you had to implement that code yourself rather than Microsoft providing it, you d probably prefer to have a longer break and drown your sorrows.
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Managing BLOBs using the StorageClient library
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Now that you ve finished your break and you re rested enough to read this, let s look at how you can use the StorageClient library to list BLOBs in a container, rather than using the REST API directly. In chapter 8, you developed a sample management application that would allow you to upload podcasts in an MP3 format that were ready to be converted to WMA. You made an ASP.NET page that displayed a grid of all the containers in your storage account. Included in the grid was a hyperlink that would redirect you to another page called blobs.aspx, passing in the name of the selected container in the query string. We re going to extend that example now to develop the page blobs.aspx, shown in figure 9.4. This page is similar to the page that you developed for listing containers in chapter 8. You can perform the following actions with the page shown in figure 9.4: List all BLOBs in the selected container Upload a new file Delete an existing BLOB Download an existing BLOB
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Managing BLOBs using the StorageClient library
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Figure 9.4 An ASP.NET web page that displays all the BLOBs that are in the selected container in a grid control
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Let s look at each of these actions in detail.
Listing BLOBs using the storage client
In this section, we ll look at how to generate the grid that displays the list of BLOBs. We ll explain how to upload, delete, and view BLOBs later in the chapter. The following listing contains the markup required for the blobs.aspx page shown in figure 9.3.
Listing 9.3 ASPX page that lists the BLOBs in a container
<div> <asp:GridView ID="gvBlobs" runat="server" onrowcommand="gvBlobs_RowCommand" Grid of BLOBs onrowdeleting="gvBlobs_RowDeleting"> <Columns> <asp:TemplateField> <ItemTemplate> <asp:LinkButton ID="btnDelete" runat="server" Text="Delete" CommandName="Delete" CommandArgument='<%#Eval("Uri")%>'/> </ItemTemplate> </asp:TemplateField> <asp:TemplateField> <ItemTemplate> <asp:LinkButton ID="btnView" runat="server" Text="View" CommandName="View" CommandArgument='<%#Eval("Uri")%>'/> View BLOB </ItemTemplate> button </asp:TemplateField> <asp:BoundField HeaderText="File" DataField="Uri"/> </Columns> </asp:GridView> <div> <div style="padding: 10px;"> <div> Upload: <asp:FileUpload ID="fu" runat="server" /> File upload </div> control <div>
Uploading and downloading BLOBs
<asp:Button ID="btnUpload" runat="server" Text="Upload" OnClick="btnUpload_Click" /> </div> </div> </div> </div>
Upload button
The ASPX code for displaying the BLOBs is similar to the ASPX we used in chapter 8 to list containers, so this shouldn t be too alien to you. At q a GridView is displayed that lists all the BLOBs in its data source. At w you re defining a hyperlink button that you ll use to download the BLOB, and at e is the standard ASP.NET FileUpload control to upload the file.
THE CODE-BEHIND FOR THE WEB PAGE
You ve defined how your web page will look. Now you need to bind the grid to the data source on page load. Listing 9.4 shows the code-behind required to display a list of BLOBs for the selected container in your grid.
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