Only stage some metadata changes for now, not the vendor update

default.yaml

@@ -364,6 +364,50 @@ server:
     # the default value of 512. DO NOT change this on a public server:
     # max-line-len: 512
 
+# metadata options
+metadata:
+    # maximum number of keys users can have set.
+    # this excludes admin-set keys which users cannot set or view
+    max-keys: 16
+
+    # maximum number of keys users can subscribe to at one time.
+    # opers can subscribe to more than this though
+    max-subs: 16
+
+    users:
+        # uncomment this if you ONLY want these keys to be settable
+        # allowed-keys:
+        #     - avatar
+        #     - color
+        #     - display-name
+        #     - homepage
+        #     - status
+
+        # uncomment this if you want all BUT these keys to be settable
+        # blocked-keys:
+        #     - example-bad-key
+        #     - another-bad-example
+
+        # these keys are restricted to opers
+        restricted-keys:
+            - admin:*
+            - server:*
+
+    channels:
+        # uncomment this if you ONLY want these keys to be settable
+        # allowed-keys:
+        #     - url
+
+        # uncomment this if you want all BUT these keys to be settable
+        # blocked-keys:
+        #     - example-bad-key
+        #     - another-bad-example
+
+        # these keys are restricted to opers
+        restricted-keys:
+            - admin:*
+            - server:*
+
 # account options
 accounts:
     # is account authentication enabled, i.e., can users log into existing accounts?

irc/client.go

@@ -20,6 +20,7 @@ import (
 	"github.com/ergochat/irc-go/ircfmt"
 	"github.com/ergochat/irc-go/ircmsg"
 	"github.com/ergochat/irc-go/ircreader"
+	"github.com/soroushj/menge"
 	"github.com/xdg-go/scram"
 
 	"github.com/ergochat/ergo/irc/caps"
@@ -174,6 +175,9 @@ type Session struct {
 	capState     caps.State
 	capVersion   caps.Version
 
+	stateMutex             sync.RWMutex // tier 1
+	subscribedMetadataKeys menge.StringSet
+
 	registrationMessages int
 
 	zncPlaybackTimes      *zncPlaybackTimes
@@ -359,6 +363,7 @@ func (server *Server) RunClient(conn IRCConn) {
 		proxiedIP:              proxiedIP,
 		isTor:                  wConn.Config.Tor,
 		hideSTS:                wConn.Config.Tor || wConn.Config.HideSTS,
+		subscribedMetadataKeys: menge.NewStringSet(),
 	}
 	client.sessions = []*Session{session}
 

irc/commands.go

@@ -178,6 +178,10 @@ func init() {
 			handler:   lusersHandler,
 			minParams: 0,
 		},
+		"METADATA": {
+			handler:   metadataHandler,
+			minParams: 2,
+		},
 		"MODE": {
 			handler:   modeHandler,
 			minParams: 1,

irc/config.go

@@ -300,6 +300,38 @@ func (t *ThrottleConfig) UnmarshalYAML(unmarshal func(interface{}) error) (err e
 	return
 }
 
+type MetadataKeyConfig struct {
+	AllowedKeys           []string `yaml:"allowed-keys"`
+	AllowedKeysMatcher    *regexp.Regexp
+	BlockedKeys           []string `yaml:"blocked-keys"`
+	BlockedKeysMatcher    *regexp.Regexp
+	RestrictedKeys        []string `yaml:"restricted-keys"`
+	RestrictedKeysMatcher *regexp.Regexp
+}
+
+func (mkc *MetadataKeyConfig) compileMatchers() (err error) {
+	mkc.AllowedKeysMatcher, err = utils.CompileMasks(mkc.AllowedKeys)
+	if err != nil {
+		err = errors.New("allowed-keys")
+	}
+	mkc.BlockedKeysMatcher, err = utils.CompileMasks(mkc.BlockedKeys)
+	if err != nil {
+		err = errors.New("blocked-keys")
+	}
+	mkc.RestrictedKeysMatcher, err = utils.CompileMasks(mkc.RestrictedKeys)
+	if err != nil {
+		err = errors.New("restricted-keys")
+	}
+	return err
+}
+
+type MetadataConfig struct {
+	MaxKeys  int `yaml:"max-keys"`
+	MaxSubs  int `yaml:"max-subs"`
+	Users    MetadataKeyConfig
+	Channels MetadataKeyConfig
+}
+
 type AccountConfig struct {
 	Registration          AccountRegistrationConfig
 	AuthenticationEnabled bool `yaml:"authentication-enabled"`
@@ -621,6 +653,8 @@ type Config struct {
 		MySQL       mysql.Config
 	}
 
+	Metadata MetadataConfig
+
 	Accounts AccountConfig
 
 	Channels struct {
@@ -1228,6 +1262,26 @@ func LoadConfig(filename string) (config *Config, err error) {
 		config.Server.capValues[caps.Multiline] = multilineCapValue
 	}
 
+	// confirm that we don't have both allowed and blocked metadata keys set
+	config.Server.capValues[caps.Metadata] = fmt.Sprintf("maxsub=%d,maxkey=%d", config.Metadata.MaxSubs, config.Metadata.MaxKeys)
+
+	if len(config.Metadata.Users.AllowedKeys) > 0 && len(config.Metadata.Users.BlockedKeys) > 0 {
+		return nil, errors.New("You can only set either allowed-keys or blocked-keys in metadata.users, not both")
+	}
+	if len(config.Metadata.Channels.AllowedKeys) > 0 && len(config.Metadata.Channels.BlockedKeys) > 0 {
+		return nil, errors.New("You can only set either allowed-keys or blocked-keys in metadata.channels, not both")
+	}
+
+	err = config.Metadata.Users.compileMatchers()
+	if err != nil {
+		return nil, fmt.Errorf("Could not compile metadata.users.%s", err.Error())
+	}
+
+	err = config.Metadata.Channels.compileMatchers()
+	if err != nil {
+		return nil, fmt.Errorf("Could not compile metadata.channels.%s", err.Error())
+	}
+
 	// handle legacy name 'bouncer' for 'multiclient' section:
 	if config.Accounts.Bouncer != nil {
 		config.Accounts.Multiclient = *config.Accounts.Bouncer

irc/handlers.go

@@ -12,6 +12,7 @@ import (
 	"fmt"
 	"net"
 	"os"
+	"regexp"
 	"runtime"
 	"runtime/debug"
 	"runtime/pprof"
@@ -1709,6 +1710,95 @@ func lusersHandler(server *Server, client *Client, msg ircmsg.Message, rb *Respo
 	return false
 }
 
+// METADATA <Target> <Subcommand> [<Param 1> ... [<Param n>]]
+func metadataHandler(server *Server, client *Client, msg ircmsg.Message, rb *ResponseBuffer) bool {
+	// target := msg.Params[0]
+	subCommand := strings.ToUpper(msg.Params[1])
+
+	config := server.Config().Metadata
+
+	//TODO: do this once when the server boots?
+	keyNameMatcher, _ := regexp.Compile(`^[a-z0-9_.-][a-z0-9_.\-:]*$`)
+
+	switch subCommand {
+	// these subcommands affect the client itself, or other targets
+	//
+
+	// these subcommands affect the current session
+	//
+	case "SUB":
+		var addedKeys []string
+
+		rb.session.stateMutex.Lock()
+		defer rb.session.stateMutex.Unlock()
+		for i, key := range msg.Params {
+			if i < 2 {
+				// skip target and subcommand
+				continue
+			}
+
+			if len(rb.session.subscribedMetadataKeys)+len(addedKeys) > config.MaxSubs {
+				rb.Add(nil, server.name, ERR_METADATATOOMANYSUBS, client.nick, key)
+				break
+			}
+
+			if !keyNameMatcher.MatchString(key) {
+				rb.Add(nil, server.name, ERR_KEYINVALID, client.nick, key)
+				continue
+			}
+
+			// see if key is restricted
+			if client.Oper() == nil && (config.Users.RestrictedKeysMatcher.MatchString(key) || config.Channels.RestrictedKeysMatcher.MatchString(key)) {
+				rb.Add(nil, server.name, ERR_KEYNOPERMISSION, client.nick, "*", key, "permission denied")
+				// still let the user subscribe to the key, don't continue on to the next one
+			}
+
+			addedKeys = append(addedKeys, key)
+		}
+		rb.session.subscribedMetadataKeys.Add(addedKeys...)
+
+		if len(addedKeys) > 0 {
+			rb.Add(nil, server.name, RPL_METADATASUBOK, client.nick, strings.Join(addedKeys, " "))
+		}
+		rb.Add(nil, server.name, RPL_METADATAEND, client.nick, "end of metadata")
+
+	case "UNSUB":
+		var removedKeys []string
+
+		rb.session.stateMutex.Lock()
+		defer rb.session.stateMutex.Unlock()
+		for i, key := range msg.Params {
+			if i < 2 {
+				// skip target and subcommand
+				continue
+			}
+
+			if !keyNameMatcher.MatchString(key) {
+				rb.Add(nil, server.name, ERR_KEYINVALID, client.nick, key)
+				continue
+			}
+
+			removedKeys = append(removedKeys, key)
+		}
+		rb.session.subscribedMetadataKeys.Remove(removedKeys...)
+
+		if len(removedKeys) > 0 {
+			rb.Add(nil, server.name, RPL_METADATAUNSUBOK, client.nick, strings.Join(removedKeys, " "))
+		}
+		rb.Add(nil, server.name, RPL_METADATAEND, client.nick, "end of metadata")
+
+	case "SUBS":
+		rb.session.stateMutex.RLock()
+		defer rb.session.stateMutex.RUnlock()
+		if rb.session.subscribedMetadataKeys.Size() > 0 {
+			//TODO: loop and return subscriptions with multiple numerics if we need to
+			rb.Add(nil, server.name, RPL_METADATASUBS, client.nick, strings.Join(rb.session.subscribedMetadataKeys.AsSlice(), " "))
+		}
+		rb.Add(nil, server.name, RPL_METADATAEND, client.nick, "end of metadata")
+	}
+	return false
+}
+
 // MODE <target> [<modestring> [<mode arguments>...]]
 func modeHandler(server *Server, client *Client, msg ircmsg.Message, rb *ResponseBuffer) bool {
 	if 0 < len(msg.Params[0]) && msg.Params[0][0] == '#' {

irc/help.go

@@ -347,6 +347,14 @@ Lists all the nicknames you are currently monitoring.
 
     MONITOR S
 Lists whether each nick in your MONITOR list is online or offline.`,
+	},
+	"metadata": {
+		text: `METADATA <target> <subcmd>
+
+Lets you add metadata to yourself and channels, as well as subscribe
+to metadata changes. The subcommands are:
+
+//TODO`,
 	},
 	"motd": {
 		text: `MOTD [server]

irc/metadata.go

@@ -0,0 +1,4 @@
+// Copyright (c) 2021 Daniel Oaks <daniel@danieloaks.net>
+// released under the MIT license
+
+package irc

traditional.yaml

@@ -337,6 +337,50 @@ server:
     # the default value of 512. DO NOT change this on a public server:
     # max-line-len: 512
 
+# metadata options
+metadata:
+    # maximum number of keys users can have set.
+    # this excludes admin-set keys which users cannot set or view
+    max-keys: 16
+
+    # maximum number of keys users can subscribe to at one time.
+    # opers can subscribe to more than this though
+    max-subs: 16
+
+    users:
+        # uncomment this if you ONLY want these keys to be settable
+        # allowed-keys:
+        #     - avatar
+        #     - color
+        #     - display-name
+        #     - homepage
+        #     - status
+
+        # uncomment this if you want all BUT these keys to be settable
+        # blocked-keys:
+        #     - example-bad-key
+        #     - another-bad-example
+
+        # these keys are restricted to opers
+        restricted-keys:
+            - admin:*
+            - server:*
+
+    channels:
+        # uncomment this if you ONLY want these keys to be settable
+        # allowed-keys:
+        #     - url
+
+        # uncomment this if you want all BUT these keys to be settable
+        # blocked-keys:
+        #     - example-bad-key
+        #     - another-bad-example
+
+        # these keys are restricted to opers
+        restricted-keys:
+            - admin:*
+            - server:*
+
 # account options
 accounts:
     # is account authentication enabled, i.e., can users log into existing accounts?