Check for referrers

4 Message(s) by 4 Author(s) originally posted in advanced cfml techniques

From: v_roma

Date: Saturday, October 27, 2007

Hi,

Is it possible to check where a visitor is coming from and only allow that
visitor to view a page if coming from a specific domain? This domain'd be
outside my website. Also, I'm using ColdFusion

<World-Wide Web, database, tool> {Allaire Corporation}'s
	commercial {database} application development tool that allows
	{databases} to have a {World-Wide Web} {interface}, so a
	database can be queried and updated using a {web browser}.

	The ColdFusion Server application runs on the {web server} and
	has access to a {database}.  ColdFusion files on the web
	server are {HTML} pages with additional ColdFusion commands to
	{query} or {update} the database, written in {CFML}.  When the
	page is requested by the user, the {web server} passes the
	page to the Cold Fusion application, which executes the {CFML}
	commands, places the results of the {CFML} commands in the
	{HTML} file, and returns the page to the {web server}.  The
	page returned to the {web server} is now an ordinary {HTML}
	file, and it is sent to the user.

	Examples of ColdFusion applications include order entry, event
	registration, catalogue search, directories, calendars, and
	interactive training.  ColdFusion applications are robust
	because all database interactions are encapsulated in a single
	industrial-strength {CGI} script.  The formatting and
	presentation can be modified and revised at any time (as
	opposed to having to edit and recompile {source code}).

	ColdFusion Server can connect with any database that supports
	{ODBC} or {OLE DB} or one that has a native database driver.
	Native database drivers are available for {Oracle} and
	{Sybase} databases.

	ColdFusion is available for {Windows}, {Solaris}, and {HP-UX}.
	A {development environment} for creating ColdFusion files,
	called ColdFusion Studio, is also available for {Windows}.

	Current version: MX(6), as of 2003-07-11.

	The {filename extension} for ColdFusion files is .cfm

	{Home (http://www.coldfusion.com/)}.

	(2003-07-27)

5.

Thanks much!

From: Adam Cameron

Date: Saturday, October 27, 2007

CGI.HTTP_REFERER is the variable

<programming> (Sometimes "var" /veir/ or /var/) A named memory
	location in which a program can store intermediate results and
	from which it can read it them.  Each {programming language}
	has different rules about how variables can be named, typed,
	and used.  Typically, a value is "assigned" to a variable in
	an {assignment} statement.  The value is obtained by
	evaluating an expression and then stored in the variable.  For
	example, the assignment

		x = y + 1

	means "add one to y and store the result in x".  This may look
	like a mathematical equation but the mathematical equality is
	only true in the program until the value of x or y changes.
	Furthermore, statements like

		x = x + 1

	are common.  This means "add one to x", which only makes sense
	as a state changing operation, not as a mathematical equality.

	The simplest form of variable corresponds to a single-{word}
	of {memory} or a {CPU} {register} and an assignment to a
	{load} or {store} {machine code} operation.

	A variable is usually defined to have a {type}, which never
	changes, and which defines the set of values the variable can
	hold.  A type may specify a single ("atomic") value or a
	collection ("aggregate") of values of the same or different
	types.  A common aggregate type is the {array} - a set of
	values, one of which can be selected by supplying a numerical
	{index}.

	Languages may be {untyped}, {weakly typed}, {strongly typed},
	or some combination.  {Object-oriented programming} languages
	extend this to {object} types or {classes}.

	A variable's {scope} is the region of the program source
	within which it represents a certain thing.  Scoping rules are
	also highly language dependent but most serious languages
	support both {local variables} and {global variables}.
	{Subroutine} and {function} {formal arguments} are special
	variables which are set automatically by the language runtime
	on entry to the subroutine.

	In a {functional programming} language, a variable's value
	never changes and change of state is handled as recursion over
	lists of values.

	(2004-11-16)

you are looking for. Note that sometimes it isn't present, so you must first do <CFIF IsDefined(CGI.HTTP_REFERER)>.

That's not going to get you too far: ColdFusion always returns "YES" for
isDefined("CGI.anythingYouLikeHere").

You'd want to do:
structKeyExists(CGI, "anythingYouLikeHere")

EG:
structKeyExists(CGI, "http_referer")

But in the case of CGI.http_referer, it ALWAYS exists. It might just be
blank.

--
Adam

From: jdeline

Date: Saturday, October 27, 2007

CGI.HTTP_REFERER is the variable you are looking for. Note that sometimes it isn't present, so you must first do <CFIF IsDefined(CGI.HTTP_REFERER)>.

From: Dan Bracuk

Date: Saturday, October 27, 2007

The variable you want is cgi.http_referer, as stated by jdeline. The function

1. <mathematics> (Or "map", "mapping") If D and C are sets
	(the domain and codomain) then a function f from D to C,
	normally written "f : D -> C" is a subset of D x C such that:

	1. For each d in D there exists some c in C such that (d,c) is
	an element of f.  I.e. the function is defined for every
	element of D.

	2. For each d in D, c1 and c2 in C, if both (d,c1) and (d,c2)
	are elements of f then c1 = c2.  I.e. the function is uniquely
	defined for every element of D.

	See also {image}, {inverse}, {partial function}.

	2. <programming> Computing usage derives from the mathematical
	term but is much less strict.  In programming (except in
	{functional programming}), a function may return different
	values each time it is called with the same argument values
	and may have {side effects}.

	A {procedure} is a function which returns no value but has
	only {side-effects}.  The {C} language, for example, has no
	procedures, only functions.  {ANSI C} even defines a {type},
	{void}, for the result of a function that has no result.

	(1996-09-01)

you want is contains.

Next Message: Creating Web Service - Repeating data structure

Blogs related to Check for referrers

Makes, markets and sells components and accessories.
the mangers troubleshooter hardees restaurant. ss calypso gluten content in food northmoor pomeranian night shift differential laws parker check valves icu convergance board for samsung 4298hd tv carrie underwood nude self help group 31 ...

Biometric Time System eliminates buddy punching. Installed on any ...
... driver michigan teacher salaries kawasaki disease brides house kenneth cole reaction cologne calibration dentures problem death row records over sink shelf bugs bunny dvd celexa household indianapolis coldfusion grey wolf chinese ...

Makes, markets and sells components and accessories.
... z400 inmatesontheweb More place space music stores in west virginia estetica del bonsai, guia practica top ten bittorrent sites hydroxycut weight loss formula stories archive. coldfusion credit card check Stamford park homes ...

Everywhere you look these days there is information.
kidney stones treatment asahab colleges in florida computer animation. introduction to risk management training eico fc-100 9234 522 708 30. craiglist pittsburgh coldfusion dreamweaver beaver damwi newspaper were dinosaur bones have ...

Search
... ranking newform research speakers search results pd cp lolita preteen netscape com livelocalsearch technology/research/kids/gaming/history/video anita chakrapani researchindex document query cfmentor coldfusion italian resource icq ...

subdirectories
The most important criteria subdieectories to determine subdirectoroes your Sending Limit. Generally, accounts that are otherwise unable to present metadata. Ferris uses a partial transcript of the subdirectorties FreeBSD Operating ...