From 27ecc7f384bbfc98b28dc73881968897fb8c9a8a Mon Sep 17 00:00:00 2001
From: dev <navdgo@gmail.com>
Date: Wed, 3 Apr 2019 11:47:27 -0400
Subject: Protocol and Caddyscript matchers

* Added matcher to determine what protocol the request is being made by
  - grpc, tls, http
* Added ability to run caddyscript in a matcher to evaluate the http request
* Added TLS field to caddyscript request time
* Added a library to manipulate and compare a new caddyscript time type
* Library for regex in starlark
---
 internal/caddyscript/lib/regex.go | 50 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 internal/caddyscript/lib/regex.go

(limited to 'internal/caddyscript/lib/regex.go')

diff --git a/internal/caddyscript/lib/regex.go b/internal/caddyscript/lib/regex.go
new file mode 100644
index 0000000..a06a410
--- /dev/null
+++ b/internal/caddyscript/lib/regex.go
@@ -0,0 +1,50 @@
+package caddyscript
+
+import (
+	"fmt"
+	"regexp"
+
+	"go.starlark.net/starlark"
+)
+
+// Regexp represents a regexp type for caddyscript.
+type Regexp struct{}
+
+// AttrNames defines what properties and methods are available on the Time type.
+func (r Regexp) AttrNames() []string {
+	return []string{"match_string"}
+}
+
+// Attr defines what happens when props or methods are called on the Time type.
+func (r Regexp) Attr(name string) (starlark.Value, error) {
+	switch name {
+	case "match_string":
+		b := starlark.NewBuiltin("match_string", r.MatchString)
+		b = b.BindReceiver(r)
+		return b, nil
+	}
+
+	return nil, nil
+}
+
+// MatchString reports whether the string s contains any match of the regular expression pattern. More complicated queries need to use Compile and the full Regexp interface.
+func (r Regexp) MatchString(thread *starlark.Thread, fn *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+	var pattern, match string
+	err := starlark.UnpackPositionalArgs(fn.Name(), args, kwargs, 2, &pattern, &match)
+	if err != nil {
+		return starlark.None, fmt.Errorf("could not unpack args: %v", err.Error())
+	}
+
+	matched, err := regexp.MatchString(pattern, match)
+	if err != nil {
+		return starlark.False, fmt.Errorf("matchstring: %v", err.Error())
+	}
+
+	return starlark.Bool(matched), nil
+}
+
+func (r Regexp) Freeze()               {}
+func (r Regexp) Hash() (uint32, error) { return 0, fmt.Errorf("unhashable: Regexp") }
+func (r Regexp) String() string        { return fmt.Sprint(r) }
+func (r Regexp) Type() string          { return "Regexp" }
+func (r Regexp) Truth() starlark.Bool  { return true }
-- 
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