feat: Add Harness provider (#348)

Signed-off-by: liran2000 <liran2000@gmail.com>

.github/component_owners.yml

@@ -28,6 +28,9 @@ components:
   providers/unleash:
     - liran2000
     - sighphyre
+  providers/harness:
+    - liran2000
+    - davejohnston
 
 ignored-authors:
   - renovate-bot

.release-please-manifest.json

@@ -9,5 +9,6 @@
     "providers/flagsmith": "0.1.4",
     "providers/launchdarkly": "0.1.3",
     "providers/unleash": "0.0.2-alpha",
+    "providers/harness": "0.0.1-alpha",
     "tests/flagd": "1.3.1"
 }

providers/harness/README.md

@@ -0,0 +1,74 @@
+# Unofficial Harness OpenFeature GO Provider
+
+ [Harness](https://developer.harness.io/docs/feature-flags) OpenFeature Provider can provide usage for Harness via OpenFeature GO SDK.
+
+# Installation
+
+To use the Harness provider, you'll need to install [Harness Go client](github.com/harness/ff-golang-server-sdk) and Harness provider. You can install the packages using the following command
+
+```shell
+go get github.com/harness/ff-golang-server-sdk
+go get github.com/open-feature/go-sdk-contrib/providers/harness
+```
+
+## Concepts
+* Provider Object evaluation gets Harness JSON evaluation.
+* Other provider types evaluation gets Harness matching type evaluation.
+
+## Usage
+Harness OpenFeature Provider is using Harness GO SDK.
+
+### Evaluation Context
+Evaluation Context is mapped to Harness [target](https://developer.harness.io/docs/feature-flags/ff-sdks/server-sdks/feature-flag-sdks-go-application/#add-a-target).
+OpenFeature targetingKey is mapped to _Identifier_, _Name_ is mapped to _Name_ and other fields are mapped to Attributes 
+fields.
+
+### Usage Example
+
+```go
+import (
+  harness "github.com/harness/ff-golang-server-sdk/client"
+  harnessProvider "github.com/open-feature/go-sdk-contrib/providers/harness/pkg"
+)
+
+providerConfig := harnessProvider.ProviderConfig{
+    Options: []harness.ConfigOption{
+        harness.WithWaitForInitialized(true),
+        harness.WithURL(URL),
+        harness.WithStreamEnabled(false),
+        harness.WithHTTPClient(http.DefaultClient),
+        harness.WithStoreEnabled(false),
+    },
+    SdkKey: ValidSDKKey,
+}
+
+provider, err := harnessProvider.NewProvider(providerConfig)
+if err != nil {
+    t.Fail()
+}
+err = provider.Init(of.EvaluationContext{})
+if err != nil {
+    t.Fail()
+}
+
+ctx := context.Background()
+
+of.SetProvider(provider)
+ofClient := of.NewClient("my-app")
+
+evalCtx := of.NewEvaluationContext(
+    "john",
+    map[string]interface{}{
+        "Firstname": "John",
+        "Lastname":  "Doe",
+        "Email":     "john@doe.com",
+    },
+)
+enabled, err := ofClient.BooleanValue(context.Background(), "TestTrueOn", false, evalCtx)
+if enabled == false {
+    t.Fatalf("Expected feature to be enabled")
+}
+
+```
+See [provider_test.go](./pkg/provider_test.go) for more information.
+

providers/harness/go.mod

@@ -0,0 +1,50 @@
+module github.com/open-feature/go-sdk-contrib/providers/harness
+
+go 1.19
+
+require (
+	github.com/harness/ff-golang-server-sdk v0.1.13
+	github.com/open-feature/go-sdk v1.7.0
+	github.com/stretchr/testify v1.8.4
+	github.com/jarcoal/httpmock v1.0.8
+)
+
+require (
+	github.com/Masterminds/semver/v3 v3.1.1 // indirect
+	github.com/blang/semver/v4 v4.0.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/deepmap/oapi-codegen v1.11.0 // indirect
+	github.com/getkin/kin-openapi v0.94.0 // indirect
+	github.com/ghodss/yaml v1.0.0 // indirect
+	github.com/go-logr/logr v1.2.4 // indirect
+	github.com/go-openapi/jsonpointer v0.19.5 // indirect
+	github.com/go-openapi/swag v0.21.1 // indirect
+	github.com/go-resty/resty/v2 v2.7.0 // indirect
+	github.com/golang-jwt/jwt v3.2.2+incompatible // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/hashicorp/go-cleanhttp v0.5.1 // indirect
+	github.com/hashicorp/go-retryablehttp v0.6.8 // indirect
+	github.com/hashicorp/golang-lru v0.5.4 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/kr/pretty v0.3.1 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/mitchellh/go-homedir v1.1.0 // indirect
+	github.com/mitchellh/mapstructure v1.3.3 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/r3labs/sse v0.0.0-20201126193848-34e640891548 // indirect
+	github.com/spaolacci/murmur3 v1.1.0 // indirect
+	github.com/stretchr/objx v0.5.0 // indirect
+	github.com/twmb/murmur3 v1.1.5 // indirect
+	go.uber.org/atomic v1.7.0 // indirect
+	go.uber.org/multierr v1.6.0 // indirect
+	go.uber.org/zap v1.16.0 // indirect
+	golang.org/x/exp v0.0.0-20230905200255-921286631fa9 // indirect
+	golang.org/x/net v0.12.0 // indirect
+	gopkg.in/cenkalti/backoff.v1 v1.1.0 // indirect
+	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)