v0.5: (BREAKING) new syntax for set_headers and hide_headers, updated label parser, error.Nil().String() will now return 'nil', better readme

src/docker/label_parser.go

@@ -0,0 +1,64 @@
+package docker
+
+import (
+	"net/http"
+	"strings"
+
+	E "github.com/yusing/go-proxy/error"
+	"gopkg.in/yaml.v3"
+)
+
+func yamlParser[T any](value string) (any, E.NestedError) {
+	var data T
+	err := E.From(yaml.Unmarshal([]byte(value), &data))
+	return data, err
+}
+
+func setHeadersParser(value string) (any, E.NestedError) {
+	value = strings.TrimSpace(value)
+	lines := strings.Split(value, "\n")
+	h := make(http.Header)
+	for _, line := range lines {
+		parts := strings.SplitN(line, ":", 2)
+		if len(parts) != 2 {
+			return nil, E.Invalid("set header statement", line)
+		}
+		key := strings.TrimSpace(parts[0])
+		vals := strings.Split(parts[1], ",")
+		for i := range vals {
+			h.Add(key, strings.TrimSpace(vals[i]))
+		}
+	}
+	return h, E.Nil()
+}
+
+func commaSepParser(value string) (any, E.NestedError) {
+	v := strings.Split(value, ",")
+	for i := range v {
+		v[i] = strings.TrimSpace(v[i])
+	}
+	return v, E.Nil()
+}
+
+func boolParser(value string) (any, E.NestedError) {
+	switch strings.ToLower(value) {
+	case "true", "yes", "1":
+		return true, E.Nil()
+	case "false", "no", "0":
+		return false, E.Nil()
+	default:
+		return nil, E.Invalid("boolean value", value)
+	}
+}
+
+const NSProxy = "proxy"
+
+var _ = func() int {
+	RegisterNamespace(NSProxy, ValueParserMap{
+		"aliases":       commaSepParser,
+		"set_headers":   setHeadersParser,
+		"hide_headers":  yamlParser[[]string],
+		"no_tls_verify": boolParser,
+	})
+	return 0
+}()