feat(flagsmith-provider): Add flagsmith provider (open-feature#128)

Signed-off-by: Gagan Trivedi <gagandeeptrivedi47@gmail.com>

Author: gagantrivedi

.release-please-manifest.json

@@ -4,5 +4,6 @@
     "providers/flagd": "0.1.10",
     "providers/from-env": "0.1.2",
     "providers/go-feature-flag": "0.1.4",
+    "provider/flagsmith": "0.1.0",
     "tests/flagd": "1.2.1"
-}
+}

providers/flagsmith/README.md

@@ -0,0 +1,57 @@
+# Flagsmith OpenFeature GO Provider
+
+[Flagsmith](https://flagsmith.com/) provides an all-in-one platform for developing, implementing, and managing your feature flags.
+
+# Installation
+
+To use the Flagsmith provider, you'll need to install [flagsmith Go client](https://github.com/Flagsmith/flagsmith-go-client) and flagsmith provider. You can install the packages using the following command
+
+```shell
+go get github.com/Flagsmith/flagsmith-go-client/v2
+go get github.com/open-feature/go-sdk-contrib/providers/flagsmith
+```
+
+## Usage
+Here's an example of how you can use the Flagsmith provider:
+
+```go
+import (
+    flagsmithClient "github.com/Flagsmith/flagsmith-go-client/v2"
+    of "github.com/open-feature/go-sdk/pkg/openfeature"
+    flagsmith "github.com/open-feature/go-sdk-contrib/providers/flagsmith/pkg"
+)
+    ...
+    // Initialize the flagsmith client
+	client := flagsmithClient.NewClient(os.Getenv("FLAGSMITH_ENVIRONMENT_KEY"))
+
+    // Initialize the flagsmith provider
+	provider := flagsmith.NewProvider(client, flagsmith.WithUsingBooleanConfigValue())
+
+	of.SetProvider(provider)
+
+    // Create open feature client
+	ofClient := of.NewClient("my-app")
+
+    // Start interacting with the client
+	Value, err := ofClient.BooleanValue(context.Background(), "bool_feature", defaultboolValue,  evalCtx)
+    ....
+
+    // With traits
+    traitKey := "some_key"
+    traitValue := "some_value"
+
+	evalCtx := of.NewEvaluationContext(
+            "openfeature_user",
+            map[string]interface{}{
+                 traitKey:traitValue
+            },
+        )
+	valueForIdentity, err := ofClient.BooleanValue(context.Background(), "bool_feature", defaultboolValue,  evalCtx)
+    ...
+
+```
+You can find the flagsmith client document [here](https://docs.flagsmith.com/clients/server-side)
+
+### Options
+- `WithUsingBooleanConfigValue`: Determines whether to resolve a feature value as a boolean or use the isFeatureEnabled as the flag itself.
+i.e: if the flag is enabled, the value will be true, otherwise it will be false

providers/flagsmith/go.mod

@@ -0,0 +1,19 @@
+module github.com/open-feature/go-sdk-contrib/providers/flagsmith
+
+go 1.18
+
+require (
+	github.com/Flagsmith/flagsmith-go-client/v2 v2.2.1
+	github.com/open-feature/go-sdk v1.2.0
+	github.com/stretchr/testify v1.8.1
+)
+
+require (
+	github.com/blang/semver/v4 v4.0.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/go-logr/logr v1.2.3 // indirect
+	github.com/go-resty/resty/v2 v2.7.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	golang.org/x/net v0.6.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

providers/flagsmith/go.sum

@@ -0,0 +1,38 @@
+github.com/Flagsmith/flagsmith-go-client/v2 v2.2.1 h1:OB7zfunmX7aiLoBmnrFvL1p/CMDvv57S39HyibUSxCI=
+github.com/Flagsmith/flagsmith-go-client/v2 v2.2.1/go.mod h1:er+u9YfuARNsCA3wk9rXWPjE4dgdhPJrLLOVsRJbJgo=
+github.com/blang/semver/v4 v4.0.0 h1:1PFHFE6yCCTv8C1TeyNNarDzntLi7wMI5i/pzqYIsAM=
+github.com/blang/semver/v4 v4.0.0/go.mod h1:IbckMUScFkM3pff0VJDNKRiT6TG/YpiHIM2yvyW5YoQ=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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