Added more methods to process various types of post forms

lib/landline/dsl/methods_probe.rb

@@ -4,6 +4,7 @@ require_relative '../response'
 require_relative '../util/multipart'
 require_relative '../util/parseutils'
 require_relative '../util/html'
+require 'json'
 
 module Landline
   module DSL
@@ -85,18 +86,12 @@ module Landline
       # Checks if current request has multipart/form-data associated with it
       # @return [Boolean]
       def form?
-        value, opts = Landline::Util::ParserCommon.parse_value(
-          request.headers["content-type"]
-        )
-        if value == "multipart/form-data" and
-           opts["boundary"]
-          true
-        else
-          false
-        end
+        value, opts = _verify_content_type('multipart/form-data')
+        !!(value && opts && opts['boundary'])
       end
 
       # Returns formdata
+      # @note reads request.input - may nullify request.body.
       # @return [Hash{String=>(String,Landline::Util::FormPart)}]
       def form
         _, opts = Landline::Util::ParserCommon.parse_value(
@@ -107,6 +102,39 @@ module Landline
         ).to_h
       end
 
+      # Checks if current request has urlencoded query string
+      # @return [Boolean]
+      def query?
+        !!_verify_content_type("application/x-www-form-urlencode")
+      end
+
+      # Returns parsed query hash
+      # @note reads request.body - may nullify .input, .body data is memoized
+      # @return [Hash{String => Object}] query data
+      def query
+        Landline::Util::Query.new(request.body).parse
+      end
+
+      # Returns shallow parsed query hash
+      # @note reads request.body - may nullify .input, .body data is memoized
+      # @return [Hash{String => Object}] query data
+      def query_shallow
+        Landline::Util::Query.new(request.body).parse_shallow
+      end
+
+      # Check if body is a JSON object
+      # @return [Boolean]
+      def json?
+        !!_verify_content_type('application/json')
+      end
+
+      # Return parse JSON object
+      # @note reads request.input - may nullify request.body.
+      # @return [Object]
+      def json
+        JSON.load(request.input)
+      end
+
       # Open a file relative to current filepath
       # @see File.open
       def file(path, mode = "r", *all, &block)
@@ -124,6 +152,22 @@ module Landline
       def unescape_html(text)
         Landline::Util.unescape_html(text)
       end
+
+      private
+
+      def _verify_content_type(type)
+        return false unless request.headers['content-type']
+
+        value, opts = Landline::Util::ParserCommon.parse_value(
+          request.headers["content-type"]
+        )
+        if value == type and
+           request.input
+          [value, opts]
+        else
+          false
+        end
+      end
     end
   end
 end

lib/landline/request.rb

@@ -41,12 +41,14 @@ module Landline
     end
 
     # Returns request body (if POST data exists)
+    # @note reads data from rack.input, which is not rewindable. .body data is memoized.
     # @return [nil, String]
     def body
       @body ||= @rack.input&.read
     end
 
     # Returns raw Rack input object
+    # @note Rack IO is not always rewindable - if it is read once, the data is gone (i.e. request.body will return nothing).
     # @return [IO] (May not entirely be compatible with IO, see Rack/SPEC.rdoc)
     def input
       @rack.input