added support for groups

* added possibility to add groups, list groups, delete groups
  and send a messages to a groups.

see #12

src/main.go

@@ -16,16 +16,42 @@ import (
 	"strings"
 )
 
+
+type GroupEntry struct{
+	Name string `json:"name"`
+	Id string `json:"id"`
+	InternalId string `json:"internal_id"`
+	Members []string `json:"members"`
+	Active bool `json:"active"`
+	Blocked bool `json:"blocked"`
+}
+
 func cleanupTmpFiles(paths []string) {
 	for _, path := range paths {
 		os.Remove(path)
 	}
 }
 
-func send(c *gin.Context, attachmentTmpDir string, signalCliConfig string, number string, message string, recipients []string, base64Attachments []string) {
+func send(c *gin.Context, attachmentTmpDir string, signalCliConfig string, number string, message string, 
+		recipients []string, base64Attachments []string, base64EncodedGroupId string) {
 	cmd := []string{"--config", signalCliConfig, "-u", number, "send", "-m", message}
-	cmd = append(cmd, recipients...)
+	
+	if base64EncodedGroupId != "" && len(recipients) > 0 {
+		c.JSON(400, gin.H{"error": "Please specify either a group id or recipient(s) - but not both"})
+		return
+	}
 
+	if len(recipients) > 0 {
+		cmd = append(cmd, recipients...)
+	} else {
+		groupId, err := base64.StdEncoding.DecodeString(base64EncodedGroupId)
+		if err != nil {
+			c.JSON(400, gin.H{"error": "Invalid group id"})
+			return
+		}
+		
+		cmd = append(cmd, []string{"-g", string(groupId)}...)
+	}
 	
 
 	attachmentTmpPaths := []string{}
@@ -86,6 +112,66 @@ func send(c *gin.Context, attachmentTmpDir string, signalCliConfig string, numbe
 	c.JSON(201, nil)
 }
 
+func getGroups(number string, signalCliConfig string) ([]GroupEntry, error) {
+	groupEntries := []GroupEntry{}
+
+	out, err := runSignalCli([]string{"--config", signalCliConfig, "-u", number, "listGroups", "-d"})
+	if err != nil {
+		return groupEntries, err
+	}
+
+	lines := strings.Split(out, "\n")
+	for _, line := range lines {
+		var groupEntry GroupEntry
+		if line == "" {
+			continue
+		}
+		
+		idIdx := strings.Index(line, " Name: ")
+		idPair := line[:idIdx]
+		groupEntry.InternalId = strings.TrimPrefix(idPair, "Id: ")
+		groupEntry.Id = base64.StdEncoding.EncodeToString([]byte(groupEntry.InternalId))
+		lineWithoutId := strings.TrimLeft(line[idIdx:], " ")
+
+		nameIdx := strings.Index(lineWithoutId, " Active: ")
+		namePair := lineWithoutId[:nameIdx]
+		groupEntry.Name = strings.TrimRight(strings.TrimPrefix(namePair, "Name: "), " ")
+		lineWithoutName := strings.TrimLeft(lineWithoutId[nameIdx:], " ")
+
+		activeIdx := strings.Index(lineWithoutName, " Blocked: ")
+		activePair := lineWithoutName[:activeIdx]
+		active := strings.TrimPrefix(activePair, "Active: ")
+		if active == "true" {
+			groupEntry.Active = true
+		} else {
+			groupEntry.Active = false
+		}
+		lineWithoutActive := strings.TrimLeft(lineWithoutName[activeIdx:], " ")
+
+		blockedIdx := strings.Index(lineWithoutActive, " Members: ")
+		blockedPair := lineWithoutActive[:blockedIdx]
+		blocked := strings.TrimPrefix(blockedPair, "Blocked: ")
+		if blocked == "true" {
+			groupEntry.Blocked = true
+		} else {
+			groupEntry.Blocked = false
+		}
+		lineWithoutBlocked := strings.TrimLeft(lineWithoutActive[blockedIdx:], " ")
+
+		membersPair := lineWithoutBlocked
+		members := strings.TrimPrefix(membersPair, "Members: ")
+		trimmedMembers := strings.TrimRight(strings.TrimLeft(members, "["), "]")
+		trimmedMembersList := strings.Split(trimmedMembers, ",")
+		for _, member := range trimmedMembersList {
+			groupEntry.Members = append(groupEntry.Members, strings.Trim(member, " "))
+		}
+
+		groupEntries = append(groupEntries, groupEntry)
+	}
+
+	return groupEntries, nil
+}
+
 func runSignalCli(args []string) (string, error) {
 	cmd := exec.Command("signal-cli", args...)
 	var errBuffer bytes.Buffer
@@ -204,6 +290,7 @@ func main() {
 			Recipients []string `json:"recipients"`
 			Message string `json:"message"`
 			Base64Attachment string `json:"base64_attachment"`
+			GroupId string `json:"group_id"`
 		}
 		var req Request
 		err := c.BindJSON(&req)
@@ -217,7 +304,7 @@ func main() {
 			base64Attachments = append(base64Attachments, req.Base64Attachment)
 		}
 
-		send(c, *signalCliConfig, *signalCliConfig, req.Number, req.Message, req.Recipients, base64Attachments)
+		send(c, *signalCliConfig, *signalCliConfig, req.Number, req.Message, req.Recipients, base64Attachments, req.GroupId)
 	})
 
 	router.POST("/v2/send", func(c *gin.Context) {
@@ -226,6 +313,7 @@ func main() {
 			Recipients []string `json:"recipients"`
 			Message string `json:"message"`
 			Base64Attachments []string `json:"base64_attachments"`
+			GroupId string `json:"group_id"`
 		}
 		var req Request
 		err := c.BindJSON(&req)
@@ -235,7 +323,7 @@ func main() {
 			return
 		}
 
-		send(c, *attachmentTmpDir, *signalCliConfig, req.Number, req.Message, req.Recipients, req.Base64Attachments)
+		send(c, *attachmentTmpDir, *signalCliConfig, req.Number, req.Message, req.Recipients, req.Base64Attachments, req.GroupId)
 	})
 
 	router.GET("/v1/receive/:number", func(c *gin.Context) {
@@ -263,5 +351,70 @@ func main() {
 		c.String(200, jsonStr)
 	})
 
+	router.POST("/v1/groups/:number", func(c *gin.Context) {
+		number := c.Param("number")
+		
+		type Request struct{
+			Name string `json:"name"`
+			Members []string `json:"members"`
+		}
+
+		var req Request
+		err := c.BindJSON(&req)
+		if err != nil {
+			c.JSON(400, "Couldn't process request - invalid request")
+			log.Error(err.Error())
+			return
+		}
+
+
+		cmd := []string{"--config", *signalCliConfig, "-u", number, "updateGroup", "-n", req.Name, "-m"}
+		cmd = append(cmd, req.Members...)
+		log.Info(cmd)
+		out, err := runSignalCli(cmd)
+		if err != nil {
+			c.JSON(400, gin.H{"error": err.Error()})
+			return
+		}
+
+		log.Info(out)
+
+	})
+
+	router.GET("/v1/groups/:number", func(c *gin.Context) { 
+		number := c.Param("number")
+		
+		groups, err := getGroups(number, *signalCliConfig)
+		if err != nil {
+			c.JSON(400, gin.H{"error": err.Error()})
+			return
+		}
+
+		c.JSON(200, groups)
+	})
+
+
+	router.DELETE("/v1/groups/:number/:groupid", func(c *gin.Context) {
+		base64EncodedGroupId := c.Param("groupid")
+		number := c.Param("number")
+
+		if base64EncodedGroupId == "" {
+			c.JSON(400, gin.H{"error": "Please specify a group id"})
+			return
+		}
+
+		groupId, err := base64.StdEncoding.DecodeString(base64EncodedGroupId)
+		if err != nil {
+			c.JSON(400, gin.H{"error": "Invalid group id"})
+			return
+		}
+
+		_, err = runSignalCli([]string{"--config", *signalCliConfig, "-u", number, "quitGroup", "-g", string(groupId)})
+		if err != nil {
+			c.JSON(400, gin.H{"error": err.Error()})
+			return
+		}
+	})
+
 	router.Run()
 }