feat: adds string definitions - errors and authentication consts

authentication.go

@@ -0,0 +1,26 @@
+package buxmodels
+
+import "time"
+
+const (
+	// AuthHeader is the header to use for authentication (raw xPub)
+	AuthHeader = "bux-auth-xpub"
+
+	// AuthAccessKey is the header to use for access key authentication (access public key)
+	AuthAccessKey = "bux-auth-key"
+
+	// AuthSignature is the given signature (body + timestamp)
+	AuthSignature = "bux-auth-signature"
+
+	// AuthHeaderHash hash of the body coming from the request
+	AuthHeaderHash = "bux-auth-hash"
+
+	// AuthHeaderNonce random nonce for the request
+	AuthHeaderNonce = "bux-auth-nonce"
+
+	// AuthHeaderTime the time of the request, only valid for 30 seconds
+	AuthHeaderTime = "bux-auth-time"
+
+	// AuthSignatureTTL is the max TTL for a signature to be valid
+	AuthSignatureTTL = 20 * time.Second
+)

errors_def.go

@@ -0,0 +1,7 @@
+package buxmodels
+
+import "errors"
+
+var ErrDraftNotFound = errors.New("corresponding draft transaction not found")
+
+var ErrMissingXPriv = errors.New("missing xPriv key")