PLT-1649: add response_url support for custom slash commands (#6739)

* add response_url support for custom slash commands

* pr suggestions

* pr update / suggestion

* test fix

6 files changed, 210 insertions, 0 deletions

diff --git a/store/layered_store.go b/store/layered_store.go
index 4eb908659..d215cb2f0 100644
--- a/store/layered_store.go
+++ b/store/layered_store.go
@@ -107,6 +107,10 @@ func (s *LayeredStore) Command() CommandStore {
 	return s.DatabaseLayer.Command()
 }
 
+func (s *LayeredStore) CommandWebhook() CommandWebhookStore {
+	return s.DatabaseLayer.CommandWebhook()
+}
+
 func (s *LayeredStore) Preference() PreferenceStore {
 	return s.DatabaseLayer.Preference()
 }
diff --git a/store/sql_command_webhook_store.go b/store/sql_command_webhook_store.go
new file mode 100644
index 000000000..af4b298b1
--- /dev/null
+++ b/store/sql_command_webhook_store.go
@@ -0,0 +1,125 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package store
+
+import (
+	"net/http"
+
+	"database/sql"
+
+	l4g "github.com/alecthomas/log4go"
+
+	"github.com/mattermost/platform/model"
+)
+
+type SqlCommandWebhookStore struct {
+	SqlStore
+}
+
+func NewSqlCommandWebhookStore(sqlStore SqlStore) CommandWebhookStore {
+	s := &SqlCommandWebhookStore{sqlStore}
+
+	for _, db := range sqlStore.GetAllConns() {
+		tablec := db.AddTableWithName(model.CommandWebhook{}, "CommandWebhooks").SetKeys(false, "Id")
+		tablec.ColMap("Id").SetMaxSize(26)
+		tablec.ColMap("CommandId").SetMaxSize(26)
+		tablec.ColMap("UserId").SetMaxSize(26)
+		tablec.ColMap("ChannelId").SetMaxSize(26)
+		tablec.ColMap("RootId").SetMaxSize(26)
+		tablec.ColMap("ParentId").SetMaxSize(26)
+	}
+
+	return s
+}
+
+func (s SqlCommandWebhookStore) CreateIndexesIfNotExists() {
+	s.CreateIndexIfNotExists("idx_command_webhook_create_at", "CommandWebhooks", "CreateAt")
+}
+
+func (s SqlCommandWebhookStore) Save(webhook *model.CommandWebhook) StoreChannel {
+	storeChannel := make(StoreChannel, 1)
+
+	go func() {
+		result := StoreResult{}
+
+		if len(webhook.Id) > 0 {
+			result.Err = model.NewLocAppError("SqlCommandWebhookStore.Save", "store.sql_command_webhooks.save.existing.app_error", nil, "id="+webhook.Id)
+			storeChannel <- result
+			close(storeChannel)
+			return
+		}
+
+		webhook.PreSave()
+		if result.Err = webhook.IsValid(); result.Err != nil {
+			storeChannel <- result
+			close(storeChannel)
+			return
+		}
+
+		if err := s.GetMaster().Insert(webhook); err != nil {
+			result.Err = model.NewLocAppError("SqlCommandWebhookStore.Save", "store.sql_command_webhooks.save.app_error", nil, "id="+webhook.Id+", "+err.Error())
+		} else {
+			result.Data = webhook
+		}
+
+		storeChannel <- result
+		close(storeChannel)
+	}()
+
+	return storeChannel
+}
+
+func (s SqlCommandWebhookStore) Get(id string) StoreChannel {
+	storeChannel := make(StoreChannel, 1)
+
+	go func() {
+		result := StoreResult{}
+
+		var webhook model.CommandWebhook
+
+		exptime := model.GetMillis() - model.COMMAND_WEBHOOK_LIFETIME
+		if err := s.GetReplica().SelectOne(&webhook, "SELECT * FROM CommandWebhooks WHERE Id = :Id AND CreateAt > :ExpTime", map[string]interface{}{"Id": id, "ExpTime": exptime}); err != nil {
+			result.Err = model.NewLocAppError("SqlCommandWebhookStore.Get", "store.sql_command_webhooks.get.app_error", nil, "id="+id+", err="+err.Error())
+			if err == sql.ErrNoRows {
+				result.Err.StatusCode = http.StatusNotFound
+			}
+		}
+
+		result.Data = &webhook
+
+		storeChannel <- result
+		close(storeChannel)
+	}()
+
+	return storeChannel
+}
+
+func (s SqlCommandWebhookStore) TryUse(id string, limit int) StoreChannel {
+	storeChannel := make(StoreChannel, 1)
+
+	go func() {
+		result := StoreResult{}
+
+		if sqlResult, err := s.GetMaster().Exec("UPDATE CommandWebhooks SET UseCount = UseCount + 1 WHERE Id = :Id AND UseCount < :UseLimit", map[string]interface{}{"Id": id, "UseLimit": limit}); err != nil {
+			result.Err = model.NewLocAppError("SqlCommandWebhookStore.TryUse", "store.sql_command_webhooks.try_use.app_error", nil, "id="+id+", err="+err.Error())
+		} else if rows, _ := sqlResult.RowsAffected(); rows == 0 {
+			result.Err = model.NewAppError("SqlCommandWebhookStore.TryUse", "store.sql_command_webhooks.try_use.invalid.app_error", nil, "id="+id, http.StatusBadRequest)
+		}
+
+		result.Data = id
+
+		storeChannel <- result
+		close(storeChannel)
+	}()
+
+	return storeChannel
+}
+
+func (s SqlCommandWebhookStore) Cleanup() {
+	l4g.Debug("Cleaning up command webhook store.")
+	exptime := model.GetMillis() - model.COMMAND_WEBHOOK_LIFETIME
+	if _, err := s.GetMaster().Exec("DELETE FROM CommandWebhooks WHERE CreateAt < :ExpTime", map[string]interface{}{"ExpTime": exptime}); err != nil {
+		l4g.Error("Unable to cleanup command webhook store.")
+	}
+}
diff --git a/store/sql_command_webhook_store_test.go b/store/sql_command_webhook_store_test.go
new file mode 100644
index 000000000..2215a4263
--- /dev/null
+++ b/store/sql_command_webhook_store_test.go
@@ -0,0 +1,65 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package store
+
+import (
+	"testing"
+
+	"net/http"
+
+	"github.com/mattermost/platform/model"
+)
+
+func TestCommandWebhookStore(t *testing.T) {
+	Setup()
+
+	cws := store.CommandWebhook()
+
+	h1 := &model.CommandWebhook{}
+	h1.CommandId = model.NewId()
+	h1.UserId = model.NewId()
+	h1.ChannelId = model.NewId()
+	h1 = (<-cws.Save(h1)).Data.(*model.CommandWebhook)
+
+	if r1 := <-cws.Get(h1.Id); r1.Err != nil {
+		t.Fatal(r1.Err)
+	} else {
+		if *r1.Data.(*model.CommandWebhook) != *h1 {
+			t.Fatal("invalid returned webhook")
+		}
+	}
+
+	if err := (<-cws.Get("123")).Err; err.StatusCode != http.StatusNotFound {
+		t.Fatal("Should have set the status as not found for missing id")
+	}
+
+	h2 := &model.CommandWebhook{}
+	h2.CreateAt = model.GetMillis() - 2*model.COMMAND_WEBHOOK_LIFETIME
+	h2.CommandId = model.NewId()
+	h2.UserId = model.NewId()
+	h2.ChannelId = model.NewId()
+	h2 = (<-cws.Save(h2)).Data.(*model.CommandWebhook)
+
+	if err := (<-cws.Get(h2.Id)).Err; err == nil || err.StatusCode != http.StatusNotFound {
+		t.Fatal("Should have set the status as not found for expired webhook")
+	}
+
+	cws.Cleanup()
+
+	if err := (<-cws.Get(h1.Id)).Err; err != nil {
+		t.Fatal("Should have no error getting unexpired webhook")
+	}
+
+	if err := (<-cws.Get(h2.Id)).Err; err.StatusCode != http.StatusNotFound {
+		t.Fatal("Should have set the status as not found for expired webhook")
+	}
+
+	if err := (<-cws.TryUse(h1.Id, 1)).Err; err != nil {
+		t.Fatal("Should be able to use webhook once")
+	}
+
+	if err := (<-cws.TryUse(h1.Id, 1)).Err; err == nil || err.StatusCode != http.StatusBadRequest {
+		t.Fatal("Should be able to use webhook once")
+	}
+}
diff --git a/store/sql_store.go b/store/sql_store.go
index 817f3fb0f..488b44522 100644
--- a/store/sql_store.go
+++ b/store/sql_store.go
@@ -72,6 +72,7 @@ type SqlStore interface {
 	System() SystemStore
 	Webhook() WebhookStore
 	Command() CommandStore
+	CommandWebhook() CommandWebhookStore
 	Preference() PreferenceStore
 	License() LicenseStore
 	Token() TokenStore
diff --git a/store/sql_supplier.go b/store/sql_supplier.go
index 5997a1339..5b9c268bb 100644
--- a/store/sql_supplier.go
+++ b/store/sql_supplier.go
@@ -70,6 +70,7 @@ type SqlSupplierOldStores struct {
 	system          SystemStore
 	webhook         WebhookStore
 	command         CommandStore
+	commandWebhook  CommandWebhookStore
 	preference      PreferenceStore
 	license         LicenseStore
 	token           TokenStore
@@ -111,6 +112,7 @@ func NewSqlSupplier() *SqlSupplier {
 	supplier.oldStores.system = NewSqlSystemStore(supplier)
 	supplier.oldStores.webhook = NewSqlWebhookStore(supplier)
 	supplier.oldStores.command = NewSqlCommandStore(supplier)
+	supplier.oldStores.commandWebhook = NewSqlCommandWebhookStore(supplier)
 	supplier.oldStores.preference = NewSqlPreferenceStore(supplier)
 	supplier.oldStores.license = NewSqlLicenseStore(supplier)
 	supplier.oldStores.token = NewSqlTokenStore(supplier)
@@ -142,6 +144,7 @@ func NewSqlSupplier() *SqlSupplier {
 	supplier.oldStores.system.(*SqlSystemStore).CreateIndexesIfNotExists()
 	supplier.oldStores.webhook.(*SqlWebhookStore).CreateIndexesIfNotExists()
 	supplier.oldStores.command.(*SqlCommandStore).CreateIndexesIfNotExists()
+	supplier.oldStores.commandWebhook.(*SqlCommandWebhookStore).CreateIndexesIfNotExists()
 	supplier.oldStores.preference.(*SqlPreferenceStore).CreateIndexesIfNotExists()
 	supplier.oldStores.license.(*SqlLicenseStore).CreateIndexesIfNotExists()
 	supplier.oldStores.token.(*SqlTokenStore).CreateIndexesIfNotExists()
@@ -732,6 +735,10 @@ func (ss *SqlSupplier) Command() CommandStore {
 	return ss.oldStores.command
 }
 
+func (ss *SqlSupplier) CommandWebhook() CommandWebhookStore {
+	return ss.oldStores.commandWebhook
+}
+
 func (ss *SqlSupplier) Preference() PreferenceStore {
 	return ss.oldStores.preference
 }
diff --git a/store/store.go b/store/store.go
index d883ea5a2..e86b5f116 100644
--- a/store/store.go
+++ b/store/store.go
@@ -41,6 +41,7 @@ type Store interface {
 	System() SystemStore
 	Webhook() WebhookStore
 	Command() CommandStore
+	CommandWebhook() CommandWebhookStore
 	Preference() PreferenceStore
 	License() LicenseStore
 	Token() TokenStore
@@ -326,6 +327,13 @@ type CommandStore interface {
 	AnalyticsCommandCount(teamId string) StoreChannel
 }
 
+type CommandWebhookStore interface {
+	Save(webhook *model.CommandWebhook) StoreChannel
+	Get(id string) StoreChannel
+	TryUse(id string, limit int) StoreChannel
+	Cleanup()
+}
+
 type PreferenceStore interface {
 	Save(preferences *model.Preferences) StoreChannel
 	Get(userId string, category string, name string) StoreChannel