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variables.go
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package expressions
import (
"errors"
"regexp"
"strings"
"github.com/Knetic/govaluate"
"github.com/projectdiscovery/nuclei/v3/pkg/operators/common/dsl"
)
var (
numericalExpressionRegex = regexp.MustCompile(`^[0-9+\-/\W]+$`)
unresolvedVariablesRegex = regexp.MustCompile(`(?:%7[B|b]|\{){2}([^}]+)(?:%7[D|d]|\}){2}["'\)\}]*`)
)
// ContainsUnresolvedVariables returns an error with variable names if the passed
// input contains unresolved {{<pattern-here>}} variables.
func ContainsUnresolvedVariables(items ...string) error {
for _, data := range items {
matches := unresolvedVariablesRegex.FindAllStringSubmatch(data, -1)
if len(matches) == 0 {
return nil
}
var unresolvedVariables []string
for _, match := range matches {
if len(match) < 2 {
continue
}
// Skip if the match is an expression
if numericalExpressionRegex.MatchString(match[1]) {
continue
}
// or if it contains only literals (can be solved from expression engine)
if hasLiteralsOnly(match[1]) {
continue
}
unresolvedVariables = append(unresolvedVariables, match[1])
}
if len(unresolvedVariables) > 0 {
return errors.New("unresolved variables found: " + strings.Join(unresolvedVariables, ","))
}
}
return nil
}
// ContainsVariablesWithNames returns an error with variable names if the passed
// input contains unresolved {{<pattern-here>}} variables within the provided list
func ContainsVariablesWithNames(names map[string]interface{}, items ...string) error {
for _, data := range items {
matches := unresolvedVariablesRegex.FindAllStringSubmatch(data, -1)
if len(matches) == 0 {
return nil
}
var unresolvedVariables []string
for _, match := range matches {
if len(match) < 2 {
continue
}
matchName := match[1]
// Skip if the match is an expression
if numericalExpressionRegex.MatchString(matchName) {
continue
}
// or if it contains only literals (can be solved from expression engine)
if hasLiteralsOnly(match[1]) {
continue
}
if _, ok := names[matchName]; !ok {
unresolvedVariables = append(unresolvedVariables, matchName)
}
}
if len(unresolvedVariables) > 0 {
return errors.New("unresolved variables with values found: " + strings.Join(unresolvedVariables, ","))
}
}
return nil
}
// ContainsVariablesWithIgnoreList returns an error with variable names if the passed
// input contains unresolved {{<pattern-here>}} other than the ones listed in the ignore list
func ContainsVariablesWithIgnoreList(skipNames map[string]interface{}, items ...string) error {
var unresolvedVariables []string
for _, data := range items {
matches := unresolvedVariablesRegex.FindAllStringSubmatch(data, -1)
if len(matches) == 0 {
return nil
}
for _, match := range matches {
if len(match) < 2 {
continue
}
matchName := match[1]
// Skip if the match is an expression
if numericalExpressionRegex.MatchString(matchName) {
continue
}
// or if it contains only literals (can be solved from expression engine)
if hasLiteralsOnly(match[1]) {
continue
}
if _, ok := skipNames[matchName]; ok {
continue
}
unresolvedVariables = append(unresolvedVariables, matchName)
}
}
if len(unresolvedVariables) > 0 {
return errors.New("unresolved variables with values found: " + strings.Join(unresolvedVariables, ","))
}
return nil
}
func hasLiteralsOnly(data string) bool {
expr, err := govaluate.NewEvaluableExpressionWithFunctions(data, dsl.HelperFunctions)
if err != nil {
return false
}
if expr != nil {
_, err = expr.Evaluate(nil)
return err == nil
}
return true
}