Merge pull request #93 from adnanh/development

Development

.gitignore

@@ -0,0 +1,4 @@
+.idea
+.cover
+coverage
+webhook

README.md

@@ -1,4 +1,4 @@
-[![Join the chat at https://gitter.im/adnanh/webhook](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/adnanh/webhook?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [![Flattr this](https://button.flattr.com/flattr-badge-large.png)](https://flattr.com/submit/auto?user_id=adnanh&url=https%3A%2F%2Fwww.github.com%2Fadnanh%2Fwebhook) 
+[![ghit.me](https://ghit.me/badge.svg?repo=adnanh/webhook)](https://ghit.me/repo/adnanh/webhook)[![Join the chat at https://gitter.im/adnanh/webhook](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/adnanh/webhook?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [![Flattr this](https://button.flattr.com/flattr-badge-large.png)](https://flattr.com/submit/auto?user_id=adnanh&url=https%3A%2F%2Fwww.github.com%2Fadnanh%2Fwebhook)
 
 # What is webhook?
 [webhook](https://github.com/adnanh/webhook/) is a lightweight configurable tool written in Go, that allows you to easily create HTTP endpoints (hooks) on your server, which you can use to execute configured commands. You can also pass data from the HTTP request (such as headers, payload or query variables) to your commands. [webhook](https://github.com/adnanh/webhook/) also allows you to specify rules which have to be satisfied in order for the hook to be triggered.
@@ -59,6 +59,12 @@ However, hook defined like that could pose a security threat to your system, bec
 # Using HTTPS
 [webhook](https://github.com/adnanh/webhook/) by default serves hooks using http. If you want [webhook](https://github.com/adnanh/webhook/) to serve secure content using https, you can use the `-secure` flag while starting [webhook](https://github.com/adnanh/webhook/). Files containing a certificate and matching private key for the server must be provided using the `-cert /path/to/cert.pem` and `-key /path/to/key.pem` flags. If the certificate is signed by a certificate authority, the cert file should be the concatenation of the server's certificate followed by the CA's certificate.
 
+# CORS Headers
+If you want to set CORS headers, you can use the `-header name=value` flag while starting [webhook](https://github.com/adnanh/webhook/) to set the appropriate CORS headers that will be returned with each response.
+
+# Interested in running webhook inside of a Docker container?
+You can use [almir/webhook](https://hub.docker.com/r/almir/webhook/) docker image, or create your own (please read [this discussion](https://github.com/adnanh/webhook/issues/63)).
+
 # Examples
 Check out [Hook examples page](https://github.com/adnanh/webhook/wiki/Hook-Examples) for more complex examples of hooks.
 

hook/hook.go

@@ -5,6 +5,7 @@ import (
 	"crypto/sha1"
 	"encoding/hex"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io/ioutil"
 	"reflect"
@@ -92,7 +93,7 @@ func CheckPayloadSignature(payload []byte, secret string, signature string) (str
 	expectedMAC := hex.EncodeToString(mac.Sum(nil))
 
 	if !hmac.Equal([]byte(signature), []byte(expectedMAC)) {
-		return expectedMAC, &SignatureError{expectedMAC}
+		return expectedMAC, &SignatureError{signature}
 	}
 	return expectedMAC, err
 }
@@ -195,8 +196,9 @@ func ExtractParameterAsString(s string, params interface{}) (string, bool) {
 // Argument type specifies the parameter key name and the source it should
 // be extracted from
 type Argument struct {
-	Source string `json:"source"`
-	Name   string `json:"name"`
+	Source  string `json:"source,omitempty"`
+	Name    string `json:"name,omitempty"`
+	EnvName string `json:"envname,omitempty"`
 }
 
 // Get Argument method returns the value for the Argument's key name
@@ -246,17 +248,54 @@ func (ha *Argument) Get(headers, query, payload *map[string]interface{}) (string
 	return "", false
 }
 
+// Header is a structure containing header name and it's value
+type Header struct {
+	Name  string `json:"name"`
+	Value string `json:"value"`
+}
+
+// ResponseHeaders is a slice of Header objects
+type ResponseHeaders []Header
+
+func (h *ResponseHeaders) String() string {
+	// a 'hack' to display name=value in flag usage listing
+	if len(*h) == 0 {
+		return "name=value"
+	}
+
+	result := make([]string, len(*h))
+
+	for idx, responseHeader := range *h {
+		result[idx] = fmt.Sprintf("%s=%s", responseHeader.Name, responseHeader.Value)
+	}
+
+	return fmt.Sprint(strings.Join(result, ", "))
+}
+
+// Set method appends new Header object from header=value notation
+func (h *ResponseHeaders) Set(value string) error {
+	splitResult := strings.SplitN(value, "=", 2)
+
+	if len(splitResult) != 2 {
+		return errors.New("header flag must be in name=value format")
+	}
+
+	*h = append(*h, Header{Name: splitResult[0], Value: splitResult[1]})
+	return nil
+}
+
 // Hook type is a structure containing details for a single hook
 type Hook struct {
-	ID                       string     `json:"id"`
-	ExecuteCommand           string     `json:"execute-command"`
-	CommandWorkingDirectory  string     `json:"command-working-directory"`
-	ResponseMessage          string     `json:"response-message"`
-	CaptureCommandOutput     bool       `json:"include-command-output-in-response"`
-	PassEnvironmentToCommand []Argument `json:"pass-environment-to-command"`
-	PassArgumentsToCommand   []Argument `json:"pass-arguments-to-command"`
-	JSONStringParameters     []Argument `json:"parse-parameters-as-json"`
-	TriggerRule              *Rules     `json:"trigger-rule"`
+	ID                       string          `json:"id,omitempty"`
+	ExecuteCommand           string          `json:"execute-command,omitempty"`
+	CommandWorkingDirectory  string          `json:"command-working-directory,omitempty"`
+	ResponseMessage          string          `json:"response-message,omitempty"`
+	ResponseHeaders          ResponseHeaders `json:"response-headers,omitempty"`
+	CaptureCommandOutput     bool            `json:"include-command-output-in-response,omitempty"`
+	PassEnvironmentToCommand []Argument      `json:"pass-environment-to-command,omitempty"`
+	PassArgumentsToCommand   []Argument      `json:"pass-arguments-to-command,omitempty"`
+	JSONStringParameters     []Argument      `json:"parse-parameters-as-json,omitempty"`
+	TriggerRule              *Rules          `json:"trigger-rule,omitempty"`
 }
 
 // ParseJSONParameters decodes specified arguments to JSON objects and replaces the
@@ -326,7 +365,13 @@ func (h *Hook) ExtractCommandArgumentsForEnv(headers, query, payload *map[string
 
 	for i := range h.PassEnvironmentToCommand {
 		if arg, ok := h.PassEnvironmentToCommand[i].Get(headers, query, payload); ok {
-			args = append(args, EnvNamespace+h.PassEnvironmentToCommand[i].Name+"="+arg)
+			if h.PassEnvironmentToCommand[i].EnvName != "" {
+				// first try to use the EnvName if specified
+				args = append(args, EnvNamespace+h.PassEnvironmentToCommand[i].EnvName+"="+arg)
+			} else {
+				// then fallback on the name
+				args = append(args, EnvNamespace+h.PassEnvironmentToCommand[i].Name+"="+arg)
+			}
 		} else {
 			return args, &ArgumentError{h.PassEnvironmentToCommand[i]}
 		}
@@ -367,29 +412,12 @@ func (h *Hooks) Match(id string) *Hook {
 	return nil
 }
 
-// MatchAll iterates through Hooks and returns all of the hooks that match the
-// given ID, if no hook matches the given ID, nil is returned
-func (h *Hooks) MatchAll(id string) []*Hook {
-	var matchedHooks []*Hook
-	for i := range *h {
-		if (*h)[i].ID == id {
-			matchedHooks = append(matchedHooks, &(*h)[i])
-		}
-	}
-
-	if len(matchedHooks) > 0 {
-		return matchedHooks
-	}
-
-	return nil
-}
-
 // Rules is a structure that contains one of the valid rule types
 type Rules struct {
-	And   *AndRule   `json:"and"`
-	Or    *OrRule    `json:"or"`
-	Not   *NotRule   `json:"not"`
-	Match *MatchRule `json:"match"`
+	And   *AndRule   `json:"and,omitempty"`
+	Or    *OrRule    `json:"or,omitempty"`
+	Not   *NotRule   `json:"not,omitempty"`
+	Match *MatchRule `json:"match,omitempty"`
 }
 
 // Evaluate finds the first rule property that is not nil and returns the value
@@ -464,11 +492,11 @@ func (r NotRule) Evaluate(headers, query, payload *map[string]interface{}, body
 
 // MatchRule will evaluate to true based on the type
 type MatchRule struct {
-	Type      string   `json:"type"`
-	Regex     string   `json:"regex"`
-	Secret    string   `json:"secret"`
-	Value     string   `json:"value"`
-	Parameter Argument `json:"parameter"`
+	Type      string   `json:"type,omitempty"`
+	Regex     string   `json:"regex,omitempty"`
+	Secret    string   `json:"secret,omitempty"`
+	Value     string   `json:"value,omitempty"`
+	Parameter Argument `json:"parameter,omitempty"`
 }
 
 // Constants for the MatchRule type

hook/hook_test.go

@@ -2,6 +2,7 @@ package hook
 
 import (
 	"reflect"
+	"strings"
 	"testing"
 )
 
@@ -25,6 +26,10 @@ func TestCheckPayloadSignature(t *testing.T) {
 		if (err == nil) != tt.ok || mac != tt.mac {
 			t.Errorf("failed to check payload signature {%q, %q, %q}:\nexpected {mac:%#v, ok:%#v},\ngot {mac:%#v, ok:%#v}", tt.payload, tt.secret, tt.signature, tt.mac, tt.ok, mac, (err == nil))
 		}
+
+		if err != nil && strings.Contains(err.Error(), tt.mac) {
+			t.Errorf("error message should not disclose expected mac: %s", err)
+		}
 	}
 }
 
@@ -80,7 +85,7 @@ var argumentGetTests = []struct {
 
 func TestArgumentGet(t *testing.T) {
 	for _, tt := range argumentGetTests {
-		a := Argument{tt.source, tt.name}
+		a := Argument{tt.source, tt.name, ""}
 		value, ok := a.Get(tt.headers, tt.query, tt.payload)
 		if ok != tt.ok || value != tt.value {
 			t.Errorf("failed to get {%q, %q}:\nexpected {value:%#v, ok:%#v},\ngot {value:%#v, ok:%#v}", tt.source, tt.name, tt.value, tt.ok, value, ok)
@@ -94,14 +99,14 @@ var hookParseJSONParametersTests = []struct {
 	rheaders, rquery, rpayload *map[string]interface{}
 	ok                         bool
 }{
-	{[]Argument{Argument{"header", "a"}}, &map[string]interface{}{"a": `{"b": "y"}`}, nil, nil, &map[string]interface{}{"a": map[string]interface{}{"b": "y"}}, nil, nil, true},
-	{[]Argument{Argument{"url", "a"}}, nil, &map[string]interface{}{"a": `{"b": "y"}`}, nil, nil, &map[string]interface{}{"a": map[string]interface{}{"b": "y"}}, nil, true},
-	{[]Argument{Argument{"payload", "a"}}, nil, nil, &map[string]interface{}{"a": `{"b": "y"}`}, nil, nil, &map[string]interface{}{"a": map[string]interface{}{"b": "y"}}, true},
-	{[]Argument{Argument{"header", "z"}}, &map[string]interface{}{"z": `{}`}, nil, nil, &map[string]interface{}{"z": map[string]interface{}{}}, nil, nil, true},
+	{[]Argument{Argument{"header", "a", ""}}, &map[string]interface{}{"a": `{"b": "y"}`}, nil, nil, &map[string]interface{}{"a": map[string]interface{}{"b": "y"}}, nil, nil, true},
+	{[]Argument{Argument{"url", "a", ""}}, nil, &map[string]interface{}{"a": `{"b": "y"}`}, nil, nil, &map[string]interface{}{"a": map[string]interface{}{"b": "y"}}, nil, true},
+	{[]Argument{Argument{"payload", "a", ""}}, nil, nil, &map[string]interface{}{"a": `{"b": "y"}`}, nil, nil, &map[string]interface{}{"a": map[string]interface{}{"b": "y"}}, true},
+	{[]Argument{Argument{"header", "z", ""}}, &map[string]interface{}{"z": `{}`}, nil, nil, &map[string]interface{}{"z": map[string]interface{}{}}, nil, nil, true},
 	// failures
-	{[]Argument{Argument{"header", "z"}}, &map[string]interface{}{"z": ``}, nil, nil, &map[string]interface{}{"z": ``}, nil, nil, false},     // empty string
-	{[]Argument{Argument{"header", "y"}}, &map[string]interface{}{"X": `{}`}, nil, nil, &map[string]interface{}{"X": `{}`}, nil, nil, false}, // missing parameter
-	{[]Argument{Argument{"string", "z"}}, &map[string]interface{}{"z": ``}, nil, nil, &map[string]interface{}{"z": ``}, nil, nil, false},     // invalid argument source
+	{[]Argument{Argument{"header", "z", ""}}, &map[string]interface{}{"z": ``}, nil, nil, &map[string]interface{}{"z": ``}, nil, nil, false},     // empty string
+	{[]Argument{Argument{"header", "y", ""}}, &map[string]interface{}{"X": `{}`}, nil, nil, &map[string]interface{}{"X": `{}`}, nil, nil, false}, // missing parameter
+	{[]Argument{Argument{"string", "z", ""}}, &map[string]interface{}{"z": ``}, nil, nil, &map[string]interface{}{"z": ``}, nil, nil, false},     // invalid argument source
 }
 
 func TestHookParseJSONParameters(t *testing.T) {
@@ -121,9 +126,9 @@ var hookExtractCommandArgumentsTests = []struct {
 	value                   []string
 	ok                      bool
 }{
-	{"test", []Argument{Argument{"header", "a"}}, &map[string]interface{}{"a": "z"}, nil, nil, []string{"test", "z"}, true},
+	{"test", []Argument{Argument{"header", "a", ""}}, &map[string]interface{}{"a": "z"}, nil, nil, []string{"test", "z"}, true},
 	// failures
-	{"fail", []Argument{Argument{"payload", "a"}}, &map[string]interface{}{"a": "z"}, nil, nil, []string{"fail", ""}, false},
+	{"fail", []Argument{Argument{"payload", "a", ""}}, &map[string]interface{}{"a": "z"}, nil, nil, []string{"fail", ""}, false},
 }
 
 func TestHookExtractCommandArguments(t *testing.T) {
@@ -136,6 +141,67 @@ func TestHookExtractCommandArguments(t *testing.T) {
 	}
 }
 
+// Here we test the extraction of env variables when the user defined a hook
+// with the "pass-environment-to-command" directive
+// we test both cases where the name of the data is used as the name of the
+// env key & the case where the hook definition sets the env var name to a
+// fixed value using the envname construct like so::
+//    [
+//      {
+//        "id": "push",
+//        "execute-command": "bb2mm",
+//        "command-working-directory": "/tmp",
+//        "pass-environment-to-command":
+//        [
+//          {
+//            "source": "entire-payload",
+//            "envname": "PAYLOAD"
+//          },
+//        ]
+//      }
+//    ]
+var hookExtractCommandArgumentsForEnvTests = []struct {
+	exec                    string
+	args                    []Argument
+	headers, query, payload *map[string]interface{}
+	value                   []string
+	ok                      bool
+}{
+	// successes
+	{
+		"test",
+		[]Argument{Argument{"header", "a", ""}},
+		&map[string]interface{}{"a": "z"}, nil, nil,
+		[]string{"HOOK_a=z"},
+		true,
+	},
+	{
+		"test",
+		[]Argument{Argument{"header", "a", "MYKEY"}},
+		&map[string]interface{}{"a": "z"}, nil, nil,
+		[]string{"HOOK_MYKEY=z"},
+		true,
+	},
+	// failures
+	{
+		"fail",
+		[]Argument{Argument{"payload", "a", ""}},
+		&map[string]interface{}{"a": "z"}, nil, nil,
+		[]string{},
+		false,
+	},
+}
+
+func TestHookExtractCommandArgumentsForEnv(t *testing.T) {
+	for _, tt := range hookExtractCommandArgumentsForEnvTests {
+		h := &Hook{ExecuteCommand: tt.exec, PassEnvironmentToCommand: tt.args}
+		value, err := h.ExtractCommandArgumentsForEnv(tt.headers, tt.query, tt.payload)
+		if (err == nil) != tt.ok || !reflect.DeepEqual(value, tt.value) {
+			t.Errorf("failed to extract args for env {cmd=%q, args=%v}:\nexpected %#v, ok: %v\ngot %#v, ok: %v", tt.exec, tt.args, tt.value, tt.ok, value, (err == nil))
+		}
+	}
+}
+
 var hooksLoadFromFileTests = []struct {
 	path string
 	ok   bool
@@ -182,16 +248,16 @@ var matchRuleTests = []struct {
 	ok                        bool
 	err                       bool
 }{
-	{"value", "", "", "z", Argument{"header", "a"}, &map[string]interface{}{"a": "z"}, nil, nil, []byte{}, true, false},
-	{"regex", "^z", "", "z", Argument{"header", "a"}, &map[string]interface{}{"a": "z"}, nil, nil, []byte{}, true, false},
-	{"payload-hash-sha1", "", "secret", "", Argument{"header", "a"}, &map[string]interface{}{"a": "b17e04cbb22afa8ffbff8796fc1894ed27badd9e"}, nil, nil, []byte(`{"a": "z"}`), true, false},
+	{"value", "", "", "z", Argument{"header", "a", ""}, &map[string]interface{}{"a": "z"}, nil, nil, []byte{}, true, false},
+	{"regex", "^z", "", "z", Argument{"header", "a", ""}, &map[string]interface{}{"a": "z"}, nil, nil, []byte{}, true, false},
+	{"payload-hash-sha1", "", "secret", "", Argument{"header", "a", ""}, &map[string]interface{}{"a": "b17e04cbb22afa8ffbff8796fc1894ed27badd9e"}, nil, nil, []byte(`{"a": "z"}`), true, false},
 	// failures
-	{"value", "", "", "X", Argument{"header", "a"}, &map[string]interface{}{"a": "z"}, nil, nil, []byte{}, false, false},
-	{"regex", "^X", "", "", Argument{"header", "a"}, &map[string]interface{}{"a": "z"}, nil, nil, []byte{}, false, false},
-	{"value", "", "2", "X", Argument{"header", "a"}, &map[string]interface{}{"y": "z"}, nil, nil, []byte{}, false, false}, // reference invalid header
+	{"value", "", "", "X", Argument{"header", "a", ""}, &map[string]interface{}{"a": "z"}, nil, nil, []byte{}, false, false},
+	{"regex", "^X", "", "", Argument{"header", "a", ""}, &map[string]interface{}{"a": "z"}, nil, nil, []byte{}, false, false},
+	{"value", "", "2", "X", Argument{"header", "a", ""}, &map[string]interface{}{"y": "z"}, nil, nil, []byte{}, false, false}, // reference invalid header
 	// errors
-	{"regex", "*", "", "", Argument{"header", "a"}, &map[string]interface{}{"a": "z"}, nil, nil, []byte{}, false, true},                 // invalid regex
-	{"payload-hash-sha1", "", "secret", "", Argument{"header", "a"}, &map[string]interface{}{"a": ""}, nil, nil, []byte{}, false, true}, // invalid hmac
+	{"regex", "*", "", "", Argument{"header", "a", ""}, &map[string]interface{}{"a": "z"}, nil, nil, []byte{}, false, true},                 // invalid regex
+	{"payload-hash-sha1", "", "secret", "", Argument{"header", "a", ""}, &map[string]interface{}{"a": ""}, nil, nil, []byte{}, false, true}, // invalid hmac
 }
 
 func TestMatchRule(t *testing.T) {
@@ -215,8 +281,8 @@ var andRuleTests = []struct {
 	{
 		"(a=z, b=y): a=z && b=y",
 		AndRule{
-			{Match: &MatchRule{"value", "", "", "z", Argument{"header", "a"}}},
-			{Match: &MatchRule{"value", "", "", "y", Argument{"header", "b"}}},
+			{Match: &MatchRule{"value", "", "", "z", Argument{"header", "a", ""}}},
+			{Match: &MatchRule{"value", "", "", "y", Argument{"header", "b", ""}}},
 		},
 		&map[string]interface{}{"a": "z", "b": "y"}, nil, nil, []byte{},
 		true, false,
@@ -224,8 +290,8 @@ var andRuleTests = []struct {
 	{
 		"(a=z, b=Y): a=z && b=y",
 		AndRule{
-			{Match: &MatchRule{"value", "", "", "z", Argument{"header", "a"}}},
-			{Match: &MatchRule{"value", "", "", "y", Argument{"header", "b"}}},
+			{Match: &MatchRule{"value", "", "", "z", Argument{"header", "a", ""}}},
+			{Match: &MatchRule{"value", "", "", "y", Argument{"header", "b", ""}}},
 		},
 		&map[string]interface{}{"a": "z", "b": "Y"}, nil, nil, []byte{},
 		false, false,
@@ -234,22 +300,22 @@ var andRuleTests = []struct {
 	{
 		"(a=z, b=y, c=x, d=w=, e=X, f=X): a=z && (b=y && c=x) && (d=w || e=v) && !f=u",
 		AndRule{
-			{Match: &MatchRule{"value", "", "", "z", Argument{"header", "a"}}},
+			{Match: &MatchRule{"value", "", "", "z", Argument{"header", "a", ""}}},
 			{
 				And: &AndRule{
-					{Match: &MatchRule{"value", "", "", "y", Argument{"header", "b"}}},
-					{Match: &MatchRule{"value", "", "", "x", Argument{"header", "c"}}},
+					{Match: &MatchRule{"value", "", "", "y", Argument{"header", "b", ""}}},
+					{Match: &MatchRule{"value", "", "", "x", Argument{"header", "c", ""}}},
 				},
 			},
 			{
 				Or: &OrRule{
-					{Match: &MatchRule{"value", "", "", "w", Argument{"header", "d"}}},
-					{Match: &MatchRule{"value", "", "", "v", Argument{"header", "e"}}},
+					{Match: &MatchRule{"value", "", "", "w", Argument{"header", "d", ""}}},
+					{Match: &MatchRule{"value", "", "", "v", Argument{"header", "e", ""}}},
 				},
 			},
 			{
 				Not: &NotRule{
-					Match: &MatchRule{"value", "", "", "u", Argument{"header", "f"}},
+					Match: &MatchRule{"value", "", "", "u", Argument{"header", "f", ""}},
 				},
 			},
 		},
@@ -260,7 +326,7 @@ var andRuleTests = []struct {
 	// failures
 	{
 		"invalid rule",
-		AndRule{{Match: &MatchRule{"value", "", "", "X", Argument{"header", "a"}}}},
+		AndRule{{Match: &MatchRule{"value", "", "", "X", Argument{"header", "a", ""}}}},
 		&map[string]interface{}{"y": "z"}, nil, nil, nil,
 		false, false,
 	},
@@ -286,8 +352,8 @@ var orRuleTests = []struct {
 	{
 		"(a=z, b=X): a=z || b=y",
 		OrRule{
-			{Match: &MatchRule{"value", "", "", "z", Argument{"header", "a"}}},
-			{Match: &MatchRule{"value", "", "", "y", Argument{"header", "b"}}},
+			{Match: &MatchRule{"value", "", "", "z", Argument{"header", "a", ""}}},
+			{Match: &MatchRule{"value", "", "", "y", Argument{"header", "b", ""}}},
 		},
 		&map[string]interface{}{"a": "z", "b": "X"}, nil, nil, []byte{},
 		true, false,
@@ -295,8 +361,8 @@ var orRuleTests = []struct {
 	{
 		"(a=X, b=y): a=z || b=y",
 		OrRule{
-			{Match: &MatchRule{"value", "", "", "z", Argument{"header", "a"}}},
-			{Match: &MatchRule{"value", "", "", "y", Argument{"header", "b"}}},
+			{Match: &MatchRule{"value", "", "", "z", Argument{"header", "a", ""}}},
+			{Match: &MatchRule{"value", "", "", "y", Argument{"header", "b", ""}}},
 		},
 		&map[string]interface{}{"a": "X", "b": "y"}, nil, nil, []byte{},
 		true, false,
@@ -304,8 +370,8 @@ var orRuleTests = []struct {
 	{
 		"(a=Z, b=Y): a=z || b=y",
 		OrRule{
-			{Match: &MatchRule{"value", "", "", "z", Argument{"header", "a"}}},
-			{Match: &MatchRule{"value", "", "", "y", Argument{"header", "b"}}},
+			{Match: &MatchRule{"value", "", "", "z", Argument{"header", "a", ""}}},
+			{Match: &MatchRule{"value", "", "", "y", Argument{"header", "b", ""}}},
 		},
 		&map[string]interface{}{"a": "Z", "b": "Y"}, nil, nil, []byte{},
 		false, false,
@@ -314,7 +380,7 @@ var orRuleTests = []struct {
 	{
 		"invalid rule",
 		OrRule{
-			{Match: &MatchRule{"value", "", "", "z", Argument{"header", "a"}}},
+			{Match: &MatchRule{"value", "", "", "z", Argument{"header", "a", ""}}},
 		},
 		&map[string]interface{}{"y": "Z"}, nil, nil, []byte{},
 		false, false,
@@ -338,8 +404,8 @@ var notRuleTests = []struct {
 	ok                      bool
 	err                     bool
 }{
-	{"(a=z): !a=X", NotRule{Match: &MatchRule{"value", "", "", "X", Argument{"header", "a"}}}, &map[string]interface{}{"a": "z"}, nil, nil, []byte{}, true, false},
-	{"(a=z): !a=z", NotRule{Match: &MatchRule{"value", "", "", "z", Argument{"header", "a"}}}, &map[string]interface{}{"a": "z"}, nil, nil, []byte{}, false, false},
+	{"(a=z): !a=X", NotRule{Match: &MatchRule{"value", "", "", "X", Argument{"header", "a", ""}}}, &map[string]interface{}{"a": "z"}, nil, nil, []byte{}, true, false},
+	{"(a=z): !a=z", NotRule{Match: &MatchRule{"value", "", "", "z", Argument{"header", "a", ""}}}, &map[string]interface{}{"a": "z"}, nil, nil, []byte{}, false, false},
 }
 
 func TestNotRule(t *testing.T) {

hooks.json.example

@@ -4,6 +4,13 @@
     "execute-command": "/home/adnan/redeploy-go-webhook.sh",
     "command-working-directory": "/home/adnan/go",
     "response-message": "I got the payload!",
+    "response-headers":
+    [
+      {
+        "name": "Access-Control-Allow-Origin",
+        "value": "*"
+      }
+    ],
     "pass-arguments-to-command":
     [
       {

webhook.go

@@ -21,11 +21,11 @@ import (
 )
 
 const (
-	version = "2.3.6"
+	version = "2.4.0"
 )
 
 var (
-	ip             = flag.String("ip", "", "ip the webhook should serve hooks on")
+	ip             = flag.String("ip", "0.0.0.0", "ip the webhook should serve hooks on")
 	port           = flag.Int("port", 9000, "port the webhook should serve hooks on")
 	verbose        = flag.Bool("verbose", false, "show verbose output")
 	noPanic        = flag.Bool("nopanic", false, "do not panic if hooks cannot be loaded when webhook is not running in verbose mode")
@@ -36,6 +36,8 @@ var (
 	cert           = flag.String("cert", "cert.pem", "path to the HTTPS certificate pem file")
 	key            = flag.String("key", "key.pem", "path to the HTTPS certificate private key pem file")
 
+	responseHeaders hook.ResponseHeaders
+
 	watcher *fsnotify.Watcher
 	signals chan os.Signal
 
@@ -45,6 +47,8 @@ var (
 func main() {
 	hooks = hook.Hooks{}
 
+	flag.Var(&responseHeaders, "header", "response header to return, specified in format name=value, use multiple times to set multiple headers")
+
 	flag.Parse()
 
 	log.SetPrefix("[webhook] ")
@@ -72,10 +76,16 @@ func main() {
 
 		log.Printf("couldn't load hooks from file! %+v\n", err)
 	} else {
-		log.Printf("loaded %d hook(s) from file\n", len(hooks))
+		seenHooksIds := make(map[string]bool)
+
+		log.Printf("found %d hook(s) in file\n", len(hooks))
 
 		for _, hook := range hooks {
-			log.Printf("\t> %s\n", hook.ID)
+			if seenHooksIds[hook.ID] == true {
+				log.Fatalf("error: hook with the id %s has already been loaded!\nplease check your hooks file for duplicate hooks ids!\n", hook.ID)
+			}
+			seenHooksIds[hook.ID] = true
+			log.Printf("\tloaded: %s\n", hook.ID)
 		}
 	}
 
@@ -101,10 +111,10 @@ func main() {
 	}
 
 	l := negroni.NewLogger()
-	l.Logger = log.New(os.Stderr, "[webhook] ", log.Ldate|log.Ltime)
+	l.ALogger = log.New(os.Stderr, "[webhook] ", log.Ldate|log.Ltime)
 
 	negroniRecovery := &negroni.Recovery{
-		Logger:     l.Logger,
+		Logger:     l.ALogger,
 		PrintStack: true,
 		StackAll:   false,
 		StackSize:  1024 * 8,
@@ -127,22 +137,24 @@ func main() {
 	n.UseHandler(router)
 
 	if *secure {
-		log.Printf("starting secure (https) webhook on %s:%d", *ip, *port)
+		log.Printf("serving hooks on https://%s:%d%s", *ip, *port, hooksURL)
 		log.Fatal(http.ListenAndServeTLS(fmt.Sprintf("%s:%d", *ip, *port), *cert, *key, n))
 	} else {
-		log.Printf("starting insecure (http) webhook on %s:%d", *ip, *port)
+		log.Printf("serving hooks on http://%s:%d%s", *ip, *port, hooksURL)
 		log.Fatal(http.ListenAndServe(fmt.Sprintf("%s:%d", *ip, *port), n))
 	}
 
 }
 
 func hookHandler(w http.ResponseWriter, r *http.Request) {
+	for _, responseHeader := range responseHeaders {
+		w.Header().Set(responseHeader.Name, responseHeader.Value)
+	}
+
 	id := mux.Vars(r)["id"]
 
-	matchedHooks := hooks.MatchAll(id)
-
-	if matchedHooks != nil {
-		log.Printf("%s got matched (%d time(s))\n", id, len(matchedHooks))
+	if matchedHook := hooks.Match(id); matchedHook != nil {
+		log.Printf("%s got matched\n", id)
 
 		body, err := ioutil.ReadAll(r.Body)
 		if err != nil {
@@ -179,48 +191,48 @@ func hookHandler(w http.ResponseWriter, r *http.Request) {
 		}
 
 		// handle hook
-		for _, h := range matchedHooks {
-			err := h.ParseJSONParameters(&headers, &query, &payload)
+		if err = matchedHook.ParseJSONParameters(&headers, &query, &payload); err != nil {
+			msg := fmt.Sprintf("error parsing JSON parameters: %s", err)
+			log.Printf(msg)
+			w.WriteHeader(http.StatusBadRequest)
+			fmt.Fprintf(w, "Unable to parse JSON parameters.")
+			return
+		}
+
+		var ok bool
+
+		if matchedHook.TriggerRule == nil {
+			ok = true
+		} else {
+			ok, err = matchedHook.TriggerRule.Evaluate(&headers, &query, &payload, &body)
 			if err != nil {
-				msg := fmt.Sprintf("error parsing JSON: %s", err)
+				msg := fmt.Sprintf("error evaluating hook: %s", err)
 				log.Printf(msg)
-				w.WriteHeader(http.StatusBadRequest)
-				fmt.Fprintf(w, msg)
-				return
-			}
-
-			var ok bool
-
-			if h.TriggerRule == nil {
-				ok = true
-			} else {
-				ok, err = h.TriggerRule.Evaluate(&headers, &query, &payload, &body)
-				if err != nil {
-					msg := fmt.Sprintf("error evaluating hook: %s", err)
-					log.Printf(msg)
-					w.WriteHeader(http.StatusInternalServerError)
-					fmt.Fprintf(w, msg)
-					return
-				}
-			}
-
-			if ok {
-				log.Printf("%s hook triggered successfully\n", h.ID)
-
-				if h.CaptureCommandOutput {
-					response := handleHook(h, &headers, &query, &payload, &body)
-					fmt.Fprintf(w, response)
-				} else {
-					go handleHook(h, &headers, &query, &payload, &body)
-					fmt.Fprintf(w, h.ResponseMessage)
-				}
-
+				w.WriteHeader(http.StatusInternalServerError)
+				fmt.Fprintf(w, "Error occurred while evaluating hook rules.")
 				return
 			}
 		}
 
+		if ok {
+			log.Printf("%s hook triggered successfully\n", matchedHook.ID)
+
+			for _, responseHeader := range matchedHook.ResponseHeaders {
+				w.Header().Set(responseHeader.Name, responseHeader.Value)
+			}
+
+			if matchedHook.CaptureCommandOutput {
+				response := handleHook(matchedHook, &headers, &query, &payload, &body)
+				fmt.Fprintf(w, response)
+			} else {
+				go handleHook(matchedHook, &headers, &query, &payload, &body)
+				fmt.Fprintf(w, matchedHook.ResponseMessage)
+			}
+			return
+		}
+
 		// if none of the hooks got triggered
-		log.Printf("%s got matched (%d time(s)), but didn't get triggered because the trigger rules were not satisfied\n", matchedHooks[0].ID, len(matchedHooks))
+		log.Printf("%s got matched, but didn't get triggered because the trigger rules were not satisfied\n", matchedHook.ID)
 
 		fmt.Fprintf(w, "Hook rules were not satisfied.")
 	} else {
@@ -284,10 +296,18 @@ func reloadHooks() {
 	if err != nil {
 		log.Printf("couldn't load hooks from file! %+v\n", err)
 	} else {
-		log.Printf("loaded %d hook(s) from file\n", len(hooks))
+		seenHooksIds := make(map[string]bool)
 
-		for _, hook := range hooks {
-			log.Printf("\t> %s\n", hook.ID)
+		log.Printf("found %d hook(s) in file\n", len(newHooks))
+
+		for _, hook := range newHooks {
+			if seenHooksIds[hook.ID] == true {
+				log.Printf("error: hook with the id %s has already been loaded!\nplease check your hooks file for duplicate hooks ids!", hook.ID)
+				log.Println("reverting hooks back to the previous configuration")
+				return
+			}
+			seenHooksIds[hook.ID] = true
+			log.Printf("\tloaded: %s\n", hook.ID)
 		}
 
 		hooks = newHooks