From 25ed1188ed970a19675befef12afe68045565c4a Mon Sep 17 00:00:00 2001
From: Julien Dessaux
Date: Sun, 17 Nov 2024 00:05:22 +0100
Subject: chore(tfstated): refactor helpers to their own package

---
 pkg/helpers/crypto.go | 21 +++++++++++++++++++++
 pkg/helpers/error.go  | 17 +++++++++++++++++
 pkg/helpers/json.go   | 25 +++++++++++++++++++++++++
 3 files changed, 63 insertions(+)
 create mode 100644 pkg/helpers/crypto.go
 create mode 100644 pkg/helpers/error.go
 create mode 100644 pkg/helpers/json.go

(limited to 'pkg/helpers')

diff --git a/pkg/helpers/crypto.go b/pkg/helpers/crypto.go
new file mode 100644
index 0000000..ce73cd3
--- /dev/null
+++ b/pkg/helpers/crypto.go
@@ -0,0 +1,21 @@
+package helpers
+
+import (
+	"crypto/sha256"
+
+	"git.adyxax.org/adyxax/tfstated/pkg/scrypto"
+	"golang.org/x/crypto/pbkdf2"
+)
+
+const (
+	PBKDF2Iterations = 600000
+	SaltSize         = 32
+)
+
+func GenerateSalt() []byte {
+	return scrypto.RandomBytes(SaltSize)
+}
+
+func HashPassword(password string, salt []byte) []byte {
+	return pbkdf2.Key([]byte(password), salt, PBKDF2Iterations, 32, sha256.New)
+}
diff --git a/pkg/helpers/error.go b/pkg/helpers/error.go
new file mode 100644
index 0000000..006759d
--- /dev/null
+++ b/pkg/helpers/error.go
@@ -0,0 +1,17 @@
+package helpers
+
+import (
+	"fmt"
+	"net/http"
+)
+
+func ErrorResponse(w http.ResponseWriter, status int, err error) {
+	type errorResponse struct {
+		Msg    string `json:"msg"`
+		Status int    `json:"status"`
+	}
+	_ = Encode(w, status, &errorResponse{
+		Msg:    fmt.Sprintf("%+v", err),
+		Status: status,
+	})
+}
diff --git a/pkg/helpers/json.go b/pkg/helpers/json.go
new file mode 100644
index 0000000..664a984
--- /dev/null
+++ b/pkg/helpers/json.go
@@ -0,0 +1,25 @@
+package helpers
+
+import (
+	"encoding/json"
+	"fmt"
+	"log/slog"
+	"net/http"
+)
+
+func Decode(r *http.Request, data any) error {
+	if err := json.NewDecoder(r.Body).Decode(&data); err != nil {
+		return fmt.Errorf("failed to decode json: %w", err)
+	}
+	return nil
+}
+
+func Encode(w http.ResponseWriter, status int, data any) error {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	if err := json.NewEncoder(w).Encode(data); err != nil {
+		slog.Error("failed to encode json", "err", err)
+		return fmt.Errorf("failed to encode json: %w", err)
+	}
+	return nil
+}
-- 
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