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XPath and HTML, XML, or JSON expressions

September 21, 2020

Contributed by:

S S

The Advanced policy infrastructure supports expressions for evaluating and retrieving data from HTML, XML, and JavaScript Object Notation (JSON) files. This enables you to find specific nodes in an HTML, XML, or JSON document, determine if a node exists in the file, locate nodes in XML contexts (for example, nodes that have specific parents or a specific attribute with a given value), and return the contents of such nodes. Additionally, you can use XPath expressions in rewrite expressions.

The Advanced policy expression implementation for XPath comprises an Advanced policy expression prefix (such as “HTTP.REQ.BODY”) that designates HTML or XML text, and the XPATH operator that takes the XPath expression as its argument.

HTML files are a largely free-form collection of tags and text elements. You can use the XPATH_HTML operator, which takes an XPath expression as its argument, to process HTML files. JSON files are either a collection of name/value pairs or an ordered list of values. You can use the XPATH_JSON operator, which takes an XPath expression as its argument, to process JSON files.

• .XPATH(xpathex):Operate on an XML file and return a Boolean value.

  例如,下面的表达式返回一个薄熙来olean TRUE if a node called “creator” exists under the node “Book” within the first 1000 bytes of the XML file.

  HTTP.REQ.BODY(1000).XPATH(xp%boolean(//Book/creator)%)

  Parameters:

  xpathex - XPath Boolean expression

• .XPATH(xpathex):Operate on an XML file and return a value of data type “double.”

  For example, the following expression converts the string “36” (a price value) to a value of data type “double” if the string is in the first 1000 bytes of the XML file:

  HTTP.REQ.BODY(1000).XPATH(xp%number(/Book/price)%)

  Parameters:

  xpathex - XPath numeric expression

• .XPATH(xpathex):Operate on an XML file and return a node-set or a string. Node-sets are converted to corresponding strings by using the standard XPath string conversion routine.

  For example, the following expression selects all the nodes that are enclosed by “/Book/creator” (a node-set) in the first 1000 bytes of the body:

  HTTP.REQ.BODY(1000).XPATH(xp%/Book/creator%)

  Parameters:

  xpathex - XPath expression

• .XPATH_HTML(xpathex)

  Operate on an HTML file and return a text value.

  For example, the following expression operates on an HTML file and returns the text enclosed in

The portion of the HTML body that is selected by the expression is marked for further processing.

Parameters:

xpathex - XPath expression

• .XPATH_JSON(xpathex)

  Operate on a JSON file and return a Boolean value.

  For example, consider the following JSON file:

  {“Book”:{“creator”:{“person”:{“name”:’’} }, “title”:’