Add Sprig templating capability to transforms and CombineFromComposite

example/composition.yaml

@@ -24,10 +24,60 @@ spec:
               region: us-east-2
         patches:
         - type: FromCompositeFieldPath
-          fromFieldPath: "location"
+          fromFieldPath: "spec.location"
           toFieldPath: "spec.forProvider.region"
           transforms:
           - type: map
             map: 
               EU: "eu-north-1"
-              US: "us-east-2"
+              US: "us-east-2"
+
+      - name: bucket-policy
+        base:
+          apiVersion: s3.aws.upbound.io/v1beta1
+          kind: BucketPolicy
+          spec:
+            forProvider:
+              region: us-east-2
+              bucketSelector:
+                matchControllerRef: true
+        patches:
+        - type: FromCompositeFieldPath
+          fromFieldPath: "spec.location"
+          toFieldPath: "metadata.labels.location"
+          transforms:
+          - type: string
+            string: 
+              type: Template
+              template: '{{ . | lower }}'
+        - type: CombineFromComposite
+          toFieldPath: "spec.forProvider.policy"
+          combine:
+            strategy: template
+            variables:
+              - fromFieldPath: spec.writeAccessPrincipalArns
+                variableName: writeAccessPrincipalArns
+              - fromFieldPath: spec.readAccessPrincipalArns
+            template:
+              template: |
+                {
+                  "Version":"2012-10-17",
+                  "Statement":[
+                    {
+                      "Sid":"PolicyForAllowUploadWithACL",
+                      "Effect":"Allow",
+                      "Principal":{"AWS": {{ .writeAccessPrincipalArns | toJson }}  },
+                      "Action":"s3:PutObject",
+                      "Resource":"arn:aws:s3:::DOC-EXAMPLE-BUCKET/*",
+                      "Condition": {
+                        "StringEquals": {"s3:x-amz-acl":"bucket-owner-full-control"}
+                      },
+                    {
+                      "Sid":"PolicyForAllowedRead",
+                      "Effect":"Allow",
+                      "Principal":{"AWS": {{ index . "1" | toJson }}  },
+                      "Action":"s3:GetObject",
+                      "Resource":"*",
+                    }
+                  ]
+                }

example/functions.yaml

@@ -3,5 +3,5 @@ apiVersion: pkg.crossplane.io/v1beta1
 kind: Function
 metadata:
   name: function-patch-and-transform
-spec:
-  package: xpkg.upbound.io/crossplane-contrib/function-patch-and-transform:v0.1.4
+  annotations:
+    render.crossplane.io/runtime: Development

example/xr.yaml

@@ -5,3 +5,9 @@ metadata:
   name: example-xr
 spec:
   location: US
+  writeAccessPrincipalArns:
+  - "111122223333"
+  - "444455556666"
+  readAccessPrincipalArns:
+  - "123456789012"
+  - "987654321098"

go.mod

@@ -5,6 +5,7 @@ go 1.21
 toolchain go1.21.3
 
 require (
+	github.com/Masterminds/sprig/v3 v3.2.3
 	github.com/alecthomas/kong v0.8.1
 	github.com/crossplane/crossplane-runtime v1.14.3
 	github.com/crossplane/function-sdk-go v0.1.0
@@ -20,6 +21,10 @@ require (
 
 require (
 	dario.cat/mergo v1.0.0 // indirect
+	github.com/Masterminds/goutils v1.1.1 // indirect
+	github.com/Masterminds/semver v1.5.0 // indirect
+	github.com/Masterminds/semver/v3 v3.2.0 // indirect
+	github.com/Masterminds/sprig v2.22.0+incompatible // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
@@ -40,26 +45,36 @@ require (
 	github.com/google/gnostic-models v0.6.8 // indirect
 	github.com/google/gofuzz v1.2.0 // indirect
 	github.com/google/uuid v1.3.1 // indirect
+	github.com/huandu/xstrings v1.3.3 // indirect
+	github.com/imdario/mergo v0.3.16 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/labstack/gommon v0.4.1 // indirect
 	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
+	github.com/mitchellh/copystructure v1.2.0 // indirect
+	github.com/mitchellh/reflectwalk v1.0.2 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/prometheus/client_golang v1.16.0 // indirect
 	github.com/prometheus/client_model v0.4.0 // indirect
 	github.com/prometheus/common v0.44.0 // indirect
 	github.com/prometheus/procfs v0.10.1 // indirect
+	github.com/shopspring/decimal v1.2.0 // indirect
 	github.com/spf13/afero v1.10.0 // indirect
+	github.com/spf13/cast v1.3.1 // indirect
 	github.com/spf13/cobra v1.8.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/stretchr/testify v1.8.4 // indirect
+	github.com/valyala/bytebufferpool v1.0.0 // indirect
+	github.com/valyala/fasttemplate v1.2.2 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	go.uber.org/zap v1.26.0 // indirect
+	golang.org/x/crypto v0.14.0 // indirect
 	golang.org/x/exp v0.0.0-20231006140011-7918f672742d // indirect
 	golang.org/x/mod v0.14.0 // indirect
 	golang.org/x/net v0.19.0 // indirect