mirror of https://github.com/daffainfo/nuclei.git
40 lines
1.3 KiB
Go
40 lines
1.3 KiB
Go
package expressions
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import (
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"regexp"
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"github.com/Knetic/govaluate"
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"github.com/projectdiscovery/nuclei/v2/pkg/operators/common/dsl"
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"github.com/projectdiscovery/nuclei/v2/pkg/protocols/common/generators"
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"github.com/projectdiscovery/nuclei/v2/pkg/protocols/common/replacer"
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)
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var templateExpressionRegex = regexp.MustCompile(`(?m)\{\{[^}]+\}\}`)
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// Evaluate checks if the match contains a dynamic variable, for each
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// found one we will check if it's an expression and can
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// be compiled, it will be evaluated and the results will be returned.
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//
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// The provided keys from finalValues will be used as variable names
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// for substitution inside the expression.
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func Evaluate(data string, base map[string]interface{}) (string, error) {
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data = replacer.Replace(data, base)
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dynamicValues := make(map[string]interface{})
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for _, match := range templateExpressionRegex.FindAllString(data, -1) {
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expr := generators.TrimDelimiters(match)
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compiled, err := govaluate.NewEvaluableExpressionWithFunctions(expr, dsl.HelperFunctions())
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if err != nil {
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return "", err
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}
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result, err := compiled.Evaluate(base)
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if err != nil {
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return "", err
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}
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dynamicValues[expr] = result // convert x(<payload_name>) => <x-representation>
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}
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// Replacer dynamic values if any in raw request and parse it
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return replacer.Replace(data, dynamicValues), nil
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}
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