feat: add xpath(xpathStr, xmlStr) CEL function

coll/json.go

@@ -5,7 +5,9 @@ import (
 	"encoding/json"
 	"fmt"
 	"reflect"
+	"strings"
 
+	"github.com/antchfx/xmlquery"
 	"github.com/itchyny/gojq"
 	"github.com/jmespath/go-jmespath"
 	"github.com/ohler55/ojg/jp"
@@ -113,6 +115,27 @@ func JSONPath(jsonPath string, in interface{}) (interface{}, error) {
 	return out, nil
 }
 
+// XPath evaluates an XPath expression against an XML string and returns a
+// list of text contents of all matching nodes. Use .first() on the result to
+// get a single value.
+func XPath(xpathStr, xmlStr string) ([]string, error) {
+	doc, err := xmlquery.Parse(strings.NewReader(xmlStr))
+	if err != nil {
+		return nil, fmt.Errorf("xpath: parsing xml: %w", err)
+	}
+
+	nodes, err := xmlquery.QueryAll(doc, xpathStr)
+	if err != nil {
+		return nil, fmt.Errorf("xpath: evaluating expression %q: %w", xpathStr, err)
+	}
+
+	out := make([]string, len(nodes))
+	for i, n := range nodes {
+		out[i] = n.InnerText()
+	}
+	return out, nil
+}
+
 func isSupportableType(in interface{}) bool {
 	switch in.(type) {
 	case map[string]interface{},

funcs/cel_exports.go

@@ -26,6 +26,7 @@ var CelEnvOption = []cel.EnvOption{
 	collMapToKeyValGen,
 	collJmesPathGen,
 	collJsonPathGen,
+	collXPathGen,
 	celLabelsMatch,
 	celCoalesce,
 	celFirst,

funcs/coll.go

@@ -59,6 +59,7 @@ func CreateCollFuncs(ctx context.Context) map[string]interface{} {
 	f["keyValToMap"] = coll.KeyValToMap
 	f["jsonpath"] = coll.JSONPath
 	f["jmespath"] = coll.JMESPath
+	f["xpath"] = coll.XPath
 	return f
 }
 

go.mod

@@ -5,6 +5,7 @@ go 1.25.1
 require (
 	github.com/Masterminds/goutils v1.1.1
 	github.com/Masterminds/semver/v3 v3.4.0
+	github.com/antchfx/xmlquery v1.5.1
 	github.com/flanksource/commons v1.47.2
 	github.com/flanksource/is-healthy v1.0.86
 	github.com/flanksource/kubectl-neat v1.0.4
@@ -42,6 +43,7 @@ require github.com/hairyhenderson/yaml v0.0.0-20220618171115-2d35fca545ce
 
 require (
 	cel.dev/expr v0.25.1 // indirect
+	github.com/antchfx/xpath v1.3.6 // indirect
 	github.com/antlr4-go/antlr/v4 v4.13.1 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/bsm/gomega v1.27.10 // indirect
@@ -58,6 +60,7 @@ require (
 	github.com/go-task/slim-sprig/v3 v3.0.0 // indirect
 	github.com/gobwas/glob v0.2.3 // indirect
 	github.com/goccy/go-yaml v1.19.2 // indirect
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/google/pprof v0.0.0-20260115054156-294ebfa9ad83 // indirect
 	github.com/gosimple/unidecode v1.0.1 // indirect
 	github.com/hexops/gotextdiff v1.0.3 // indirect

go.sum

@@ -4,6 +4,10 @@ github.com/Masterminds/goutils v1.1.1 h1:5nUrii3FMTL5diU80unEVvNevw1nH4+ZV4DSLVJ
 github.com/Masterminds/goutils v1.1.1/go.mod h1:8cTjp+g8YejhMuvIA5y2vz3BpJxksy863GQaJW2MFNU=
 github.com/Masterminds/semver/v3 v3.4.0 h1:Zog+i5UMtVoCU8oKka5P7i9q9HgrJeGzI9SA1Xbatp0=
 github.com/Masterminds/semver/v3 v3.4.0/go.mod h1:4V+yj/TJE1HU9XfppCwVMZq3I84lprf4nC11bSS5beM=
+github.com/antchfx/xmlquery v1.5.1 h1:T9I4Ns1EXiWHy0IqKupGhnfTQtJwlGrpXtauYOoNv78=
+github.com/antchfx/xmlquery v1.5.1/go.mod h1:bVqnl7TaDXSReKINrhZz+2E/PbCu2tUahb+wZ7WZNT8=
+github.com/antchfx/xpath v1.3.6 h1:s0y+ElRRtTQdfHP609qFu0+c6bglDv20pqOViQjjdPI=
+github.com/antchfx/xpath v1.3.6/go.mod h1:i54GszH55fYfBmoZXapTHN8T8tkcHfRgLyVwwqzXNcs=
 github.com/antlr4-go/antlr/v4 v4.13.1 h1:SqQKkuVZ+zWkMMNkjy5FZe5mr5WURWnlpmOuzYWrPrQ=
 github.com/antlr4-go/antlr/v4 v4.13.1/go.mod h1:GKmUxMtwp6ZgGwZSva4eWPC5mS6vUAmOABFgjdkM7Nw=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
@@ -56,8 +60,11 @@ github.com/gobwas/glob v0.2.3 h1:A4xDbljILXROh+kObIiy5kIaPYD8e96x1tgBhUI5J+Y=
 github.com/gobwas/glob v0.2.3/go.mod h1:d3Ez4x06l9bZtSvzIay5+Yzi0fmZzPgnTbPcKjJAkT8=
 github.com/goccy/go-yaml v1.19.2 h1:PmFC1S6h8ljIz6gMRBopkjP1TVT7xuwrButHID66PoM=
 github.com/goccy/go-yaml v1.19.2/go.mod h1:XBurs7gK8ATbW4ZPGKgcbrY1Br56PdM69F7LkFRi1kA=
+github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da h1:oI5xCqsCo564l8iNU+DwB5epxmsaqB+rhGL0m5jtYqE=
+github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
 github.com/google/cel-go v0.27.0 h1:e7ih85+4qVrBuqQWTW4FKSqZYokVuc3HnhH5keboFTo=
 github.com/google/cel-go v0.27.0/go.mod h1:tTJ11FWqnhw5KKpnWpvW9CJC3Y9GK4EIS0WXnBbebzw=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
 github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
@@ -184,6 +191,7 @@ github.com/ugorji/go/codec v1.3.1 h1:waO7eEiFDwidsBN6agj1vJQ4AG7lh2yqXyOXqhgQuyY
 github.com/ugorji/go/codec v1.3.1/go.mod h1:pRBVtBSKl77K30Bv8R2P+cLSGaTtex6fsA2Wjqmfxj4=
 github.com/x448/float16 v0.8.4 h1:qLwI1I70+NjRFUR3zs1JPUCgaCXSh3SW62uAKT1mSBM=
 github.com/x448/float16 v0.8.4/go.mod h1:14CWIYCyZA/cWjXOioeEpHeN/83MdbZDRQHoFcYsOfg=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 github.com/yuin/gopher-lua v1.1.1 h1:kYKnWBjvbNP4XLT3+bPEwAXJx262OhaHDWDVOPjL46M=
 github.com/yuin/gopher-lua v1.1.1/go.mod h1:GBR0iDaNXjAgGg9zfCvksxSRnQx76gclCIb7kdAd1Pw=
 go.opentelemetry.io/auto/sdk v1.2.1 h1:jXsnJ4Lmnqd11kwkBV2LgLoFMZKizbCi5fNZ/ipaZ64=
@@ -204,21 +212,84 @@ go.yaml.in/yaml/v2 v2.4.3 h1:6gvOSjQoTB3vt1l+CU+tSyi/HOjfOjRLJ4YwYZGwRO0=
 go.yaml.in/yaml/v2 v2.4.3/go.mod h1:zSxWcmIDjOzPXpjlTTbAsKokqkDNAVtZO0WOMiT90s8=
 go.yaml.in/yaml/v3 v3.0.4 h1:tfq32ie2Jv2UxXFdLJdh3jXuOzWiL1fo0bu/FbuKpbc=
 go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/crypto v0.13.0/go.mod h1:y6Z2r+Rw4iayiXXAIxJIDAJ1zMW4yaTpebo8fPOliYc=
+golang.org/x/crypto v0.19.0/go.mod h1:Iy9bg/ha4yyC70EfRS8jz+B6ybOBKMaSxLj6P6oBDfU=
+golang.org/x/crypto v0.23.0/go.mod h1:CKFgDieR+mRhux2Lsu27y0fO304Db0wZe70UKqHu0v8=
+golang.org/x/crypto v0.31.0/go.mod h1:kDsLvtWBEx7MV9tJOj9bnXsPbxwJQ6csT/x4KIN4Ssk=
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 golang.org/x/exp v0.0.0-20260218203240-3dfff04db8fa/go.mod h1:K79w1Vqn7PoiZn+TkNpx3BUWUQksGO3JcVX6qIjytmA=
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tests/cel_test.go

@@ -279,6 +279,12 @@ func TestCelJSON(t *testing.T) {
 		{map[string]interface{}{"i": person}, "jq('.Address.city_name', i)", "Kathmandu"},
 		{map[string]interface{}{"i": person}, "jq('.Address.country', i)", ""},
 		{map[string]interface{}{"i": personJSONString}, "jq('.Address.city_name', i)", "Kathmandu"},
+
+		// XPath always returns a list; use .first() for a single value
+		{nil, `xpath('//name/text()', '<root><name>Alice</name></root>').first()`, "Alice"},
+		{nil, `xpath('//item/@id', '<root><item id="42"/></root>').first()`, "42"},
+		{nil, `xpath('//item/@id', '<root><item id="1"/><item id="2"/></root>')`, "[1 2]"},
+		{nil, `xpath('//missing', '<root><name>Alice</name></root>')`, "[]"},
 	})
 }