providers/url: Add ability to parse POST form data

providers/url/url.go

@@ -1,5 +1,6 @@
 package url
 
+import "net/http"
 import "net/url"
 import "html/template"
 import "git.tebibyte.media/sashakoshka/step"
@@ -15,6 +16,7 @@ type Provider struct {
 func (this *Provider) FuncMap () template.FuncMap {
 	return template.FuncMap {
 		"parseQuery": funcParseQuery,
+		"parseForm":  funcParseForm,
 	}
 }
 
@@ -23,8 +25,13 @@ func funcParseQuery (query string) url.Values {
 	// and returning an error in a template function causes everything to
 	// stop rather ungracefully
 	values, err := url.ParseQuery(query)
-	if err != nil {
-		values = make(url.Values)
-	}
+	if err != nil { return nil }
 	return values
 }
+
+
+func funcParseForm (req *http.Request) url.Values {
+	err := req.ParseForm()
+	if err != nil { return nil }
+	return req.Form
+}