Computer Network Fundamentals
600.444
Project 1: Drop Box

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|  TABLE OF CONTENTS  |
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(1)  Team Members
(2)  Server
(3)  Client
(4)  3rd Party Libraries
(5)  Getting Started


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|    Team Members     |
-----------------------

Jeremy Weiss <[email protected]>
Juneki Hong <[email protected]>
Noah Belcher <[email protected]>

All team members are taking the class at the 600.444 level. 


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|       Server        |
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The server was written in Python. We made use of Tornado (for the web server) 
and Curtain (for digest authentication). Both are included in our project 
source code to make distribution easier.

Running the Server:
To run: ./server.py
-p can be used to specify the port
-w can be used to specify an alternate webroot

Protocol extensions:
To register a new user:
Request:
PUT /register
<Registration>
        <Username>bob</Username>
        <Password>42</Password>
</Registration>

Response on success:
<Response>User Created</Response>

To change the password of the logged-in user:
PUT /password
<Password>1</Password>

Response on success:
<Response>Password Changed</Response>


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|       Client        |
-----------------------

The client was written in Java for Android devices. We have tested it on 
physical devices running Android 2.0, 2.1, and 2.2. We have also tested it 
on the Android emulator for the same OS versions. 

Activities:
 - Login.java
   Enables the user to login or register.
   
 - Password.java
   Enables the user to change their password.
   
 - DirList.java
   Shows a directory listing from the server. From here, the user
   can view or remove other directories or files. The user also 
   has the option of uploading a file to the current directory
   from their SDCard. 
   
 - ViewFile.java
   Shows the information for a given file. The user has the option of
   previewing the file. If the file is a common text/image/audio/document 
   format, we will display a preview of the file for the user. The 
   user also has the option of removing the file.
   
 - Upload.java
   Displays a listing of files in SDCard/Uploads/. The user can choose 
   to upload a file to the server and/or return to the server.

Other Java files:
 - Base64.java
   This is the Android 2.2 Base64 class (exported from android.util.Base64). 
   We included it because it is only available in Android 2.2, and we wanted 
   to support previous versions of Android. (For example, 2.0 and 2.1)
   For more information, please see (2) under "3rd party Libraries." 
   
 - DirListAdapter.java
   A custom adapter (that extends from android.widget.BaseAdapter) written for
   a ListView object (used in DirList.java). This adapter enables us to display 
   icons next to entries in a ListView. 
   
 - HttpException.java
   Custom exception object that gets thrown when a connection problem occurs. 
   This exception would get thrown if the server is down or if the user entered
   an invalid host or port. 
   
 - LoginException.java
   Custom exception object that gets thrown when a problem occurs during login. 
   This exception would be thrown if the server returned 401 Unauthorized.
   
 - Resource.java
   An object that represents the centents of a file/folder resource. It also 
   contains all of the appropriate metadata so that the client and the server 
   can know what to do and where to send the file.
   
 - WebService.java
   Provides static methods for sending and receiving data from the server.
   
 - XmlEngine.java
   Converts XML to Resource objects and Resource objects to XML.

An external JAR file is needed for compilation and is included in our project. 
Please see (1) under "3rd Party Libraries" below. 

-----------------------
| 3rd Party Libraries |
-----------------------

(1) Apache Commons IO   
    Location: client/assets/commons-io-2.0.1.jar
    
    We used the Commons IO for some file operations and input stream to byte
    array conversions. 
    
    
(2) Android Base64
    Location: client/src/com/dbox/client/Base64.java

    Android ships with a Base64 encoded/decoder for SDK versions >= 2.2. 
    To ensure support Android OS versions < 2.2, we checked out the source 
    code for android.util.Base64 and added it to com.dbox.client.Base64.
    This provides the reliability of Android's latest Base64 class, while 
    ensuring that the dbox client will run on previous versions of Android. 
    
(3) Tornado Web Server
    Location: dropboxserver/tornado
    
    Used for the web server.
    
(4) Curtain for Tornado
    Location: dropboxserver/curtain

    Curtain provides digest authentication for Tornado. The Curtain files 
    have been slightly modified by us to fix a couple of bugs.


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|   Getting Started   |
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All you need to do is run "./server.py" in order for the script to start the 
server. By default, the server will listen in on port 8042. If you would like 
to customize this, you need to say "./server.py -p 12345" to listen in on port 
12345 instead. Thats all there is to it! Try connecting or interacting with the 
server on the designated port and the script will display what is happening and 
what is being requested.

If you want to have a good time, we will keep our server running. You can connect 
to "acm.jhu.edu" on port "8042". You can login with username "foo" with the 
password "42". In fact, the webroot that we distribute will have a built-in user 
"foo" with a password "42" and some sample files.

If you want to create a new user, you can directly edit the ".passwd" file and 
directly create the directory in webroot... or you can just try out the client's 
"Registration" functionality and we will do it all automatically for you.