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You can use the monop utility (short for mono print) to display the C# definition of a given type within a specified assembly. As you might suspect, this tool can be quite helpful when you wish to view a method signature quickly, rather than digging through the formal documentation. As a quick test, try entering the following command at a Mono command prompt: monop System.Object You should see the definition of your good friend, System.Object: [Serializable] public class Object { public Object (); public static bool Equals (object objA, object objB); public static bool ReferenceEquals (object objA, object objB); public virtual bool Equals (object obj); protected override void Finalize (); public virtual int GetHashCode (); public Type GetType (); protected object MemberwiseClone (); public virtual string ToString (); }

Now let s look at Mono in action. You begin by building a code library named CoreLibDumper.dll. This assembly contains a single class type named CoreLibDumper that supports a static method named DumpTypeToFile(). The method takes a string parameter that represents the fully qualified name of any type within mscorlib.dll and obtains the related type information through the reflection API (see 15), dumping the class member signatures to a local file on the hard drive.

That way, you are assured that the form API has protected you Finally, you can also protect GET requests if necessary by using a token (generated by drupal_get_token()) in the URL and verifying the token with drupal_valid_token()..

Create a new folder on your C: drive named MonoCode. Within this new folder, create a subfolder named CorLibDumper that contains the following C# file (named CorLibDumper.cs):

// CorLibDumper.cs using System; using System.Reflection; using System.IO; // Define assembly version. [assembly:AssemblyVersion("1.0.0.0")] namespace CorLibDumper { public class TypeDumper { public static bool DumpTypeToFile(string typeToDisplay) { // Attempt to load type into memory. Type theType = null; try { // Second parameter to GetType() controls if an // exception should be thrown if the type is not found. theType = Type.GetType(typeToDisplay, true); } catch { return false; } // Create local *.txt file. using(StreamWriter sw = File.CreateText(string.Format("{0}.txt", theType.FullName))) { // Now dump type to file. sw.WriteLine("Type Name: {0}", theType.FullName); sw.WriteLine("Members:"); foreach(MemberInfo mi in theType.GetMembers()) sw.WriteLine("\t-> {0}", mi.ToString()); } return true; } } } Like the Microsoft C# compiler, Mono s C# compilers support the use of response files (see 2). While you could compile this file by specifying each required argument manually at the command line, you can instead create a new file named LibraryBuild.rsp (in the same location as CorLibDumper.cs) that contains the following command set: /target:library /out:CorLibDumper.dll CorLibDumper.cs You can now compile your library at the command line, as follows: mcs @LibraryBuild.rsp

The dangers faced by Drupal when handling files and file paths are the same as with other web applications.

This approach is functionally equivalent to the following (more verbose) command set: mcs /target:library /out:CorLibDumper.dll CorLibDumper.cs

Mono supports the notion of deploying strongly named assemblies (see 15) to the Mono GAC. To generate the necessary public/private key data, Mono provides the sn command-line utility, which functions more or less identically to Microsoft s tool of the same name. For example, the following command generates a new *.snk file (specify the - option to view all possible commands): sn -k myTestKeyPair.snk You can tell the C# compiler to use this key data to assign a strong name to CorLibDumper.dll by updating your LibraryBuild.rsp file with the following additional command: /target:library /out:CorLibDumper.dll /keyfile:myTestKeyPair.snk CorLibDumper.cs Now recompile your assembly: mcs @LibraryBuild.rsp

File permissions should be set in such a way that the user cannot manipulate (add, rename, or delete) files. The web server should have read-only access to Drupal files and directories. The exception is the file system paths. Clearly, the web server must have access to those directories so it can write uploaded files.

Before you deploy the assembly to the Mono GAC, you should familiarize yourself with the monodis command-line tool, which is the functional equivalent of Microsoft s ildasm.exe (without the GUI front end). Using monodis, you can view the CIL code, manifest, and type metadata for a specified assembly. In this case, you want to view the core details of your (now strongly named) assembly using the --assembly flag. Figure B-5 shows the result of the following command set: monodis --assembly CorLibDumper.dll

Figure B-5. Viewing the CIL Code, Metadata, and Manifest of an Assembly with monodis The assembly s manifest now exposes the public key value defined in myTestKeyPair.snk.