added new permissions model

handlers.go

@@ -44,20 +44,11 @@ func (b *bot) chatHandler(m chat1.MsgSummary) {
 		}
 		// then check if this is the root command
 		if isRootCommand(m.Content.Text.Body, b.cmd(), b.k.Username) {
-			b.handleMeeting(m)
-			return
-		}
-		// then check sub-command variants
-		// meet
-		if hasCommandPrefix(m.Content.Text.Body, b.cmd(), b.k.Username, "meet") {
-			b.handleMeeting(m)
-			return
-		}
-		// feedback
-		if hasCommandPrefix(m.Content.Text.Body, b.cmd(), b.k.Username, "feedback") {
-			b.handleFeedback(m)
+			b.checkPermissionAndExecute("reader", m, b.handleMeeting)
 			return
 		}
+
+		// then check help and welcome (non-permissions)
 		// help
 		if hasCommandPrefix(m.Content.Text.Body, b.cmd(), b.k.Username, "help") {
 			b.handleWelcome(m.ConvID)
@@ -68,9 +59,21 @@ func (b *bot) chatHandler(m chat1.MsgSummary) {
 			b.handleWelcome(m.ConvID)
 			return
 		}
+
+		// then check sub-command variants (permissions)
+		// meet
+		if hasCommandPrefix(m.Content.Text.Body, b.cmd(), b.k.Username, "meet") {
+			b.checkPermissionAndExecute("reader", m, b.handleMeeting)
+			return
+		}
+		// feedback
+		if hasCommandPrefix(m.Content.Text.Body, b.cmd(), b.k.Username, "feedback") {
+			b.checkPermissionAndExecute("reader", m, b.handleFeedback)
+			return
+		}
 		// config commands
 		if hasCommandPrefix(m.Content.Text.Body, b.cmd(), b.k.Username, "config") {
-			b.handleConfigCommand(m)
+			b.checkPermissionAndExecute("admin", m, b.handleConfigCommand)
 			return
 		}
 	}

permissions.go

@@ -0,0 +1,90 @@
+package main
+
+import (
+	"strings"
+
+	"samhofi.us/x/keybase/types/chat1"
+)
+
+// checkPermissionAndExecute will check the minimum required role for the permission and execute the handler function if allowed
+func (b *bot) checkPermissionAndExecute(requiredRole string, m chat1.MsgSummary, f func(chat1.MsgSummary)) {
+	// get the members of the conversation
+	b.debug("Executing permissions check")
+	// currently this doesn't work due to a keybase bug
+	// the workaround is to check the general channel the old way
+	//conversation, err := b.k.ListMembersOfConversation(m.ConvID)
+
+	// **** <workaround>
+	channel := chat1.ChatChannel{
+		Name:        m.Channel.Name,
+		MembersType: m.Channel.MembersType,
+		TopicName:   "general",
+	}
+	conversation, err := b.k.ListMembersOfChannel(channel)
+	/// **** </workaround>
+
+	if err != nil {
+		eid := b.logError(err)
+		b.k.ReactByConvID(m.ConvID, m.Id, "Error ID %s", eid)
+		return
+	}
+	// create a map of valid roles, according to @dxb struc
+	memberTypes := make(map[string]struct{})
+	memberTypes["owner"] = struct{}{}
+	memberTypes["admin"] = struct{}{}
+	memberTypes["writer"] = struct{}{}
+	memberTypes["reader"] = struct{}{}
+
+	// if the role is not in the map, its an invalid role
+	if _, ok := memberTypes[strings.ToLower(requiredRole)]; !ok {
+		// the role passed was not valid, so bail
+		b.log("ERROR: %s is not a valid permissions level", requiredRole)
+		return
+	}
+
+	// then descend permissions from top down
+	for _, member := range conversation.Members.Owners {
+		if strings.ToLower(member.Username) == strings.ToLower(m.Sender.Username) {
+			f(m)
+			return
+		}
+		b.debug("no")
+	}
+	// if the required role was owner, return and don't evaluate the rest
+	if strings.ToLower(requiredRole) == "owner" {
+		b.debug("user does not have required permission of: owner")
+		return
+	}
+	// admins
+	for _, member := range conversation.Members.Admins {
+		if strings.ToLower(member.Username) == strings.ToLower(m.Sender.Username) {
+			f(m)
+			return
+		}
+	}
+	if strings.ToLower(requiredRole) == "admin" {
+		b.debug("user does not have required permission of: admin")
+		return
+	}
+	// writers
+	for _, member := range conversation.Members.Writers {
+		if strings.ToLower(member.Username) == strings.ToLower(m.Sender.Username) {
+			f(m)
+			return
+		}
+	}
+	if strings.ToLower(requiredRole) == "writer" {
+		b.debug("user does not have required permission of: writer")
+		return
+	}
+	// readers
+	for _, member := range conversation.Members.Readers {
+		if strings.ToLower(member.Username) == strings.ToLower(m.Sender.Username) {
+			f(m)
+			return
+		}
+	}
+	// just return - restricted bots shouldn't be able to run commands
+	b.debug("user does not have required permission of: reader")
+	return
+}