api,frontend: add Akismet spam flagging integration

api/Gopkg.lock

@@ -9,6 +9,14 @@
   revision = "64a2037ec6be8a4b0c1d1f706ed35b428b989239"
   version = "v0.26.0"
 
+[[projects]]
+  branch = "master"
+  digest = "1:9769b231d8f5ff406a012aa7f293e45ed69d11617832a1c3c7b8c6ce1558a2a1"
+  name = "github.com/adtac/go-akismet"
+  packages = ["akismet"]
+  pruneopts = "UT"
+  revision = "0ca9e1023047c869ecd4bd3c20780511597a4a77"
+
 [[projects]]
   digest = "1:15042ad3498153684d09f393bbaec6b216c8eec6d61f63dff711de7d64ed8861"
   name = "github.com/golang/protobuf"
@@ -143,6 +151,7 @@
   analyzer-name = "dep"
   analyzer-version = 1
   input-imports = [
+    "github.com/adtac/go-akismet/akismet",
     "github.com/gorilla/handlers",
     "github.com/gorilla/mux",
     "github.com/lib/pq",

api/akismet.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"github.com/adtac/go-akismet/akismet"
+	"os"
+)
+
+func isSpam(domain string, userIp string, userAgent string, name string, email string, url string, markdown string) bool {
+	akismetKey := os.Getenv("AKISMET_KEY")
+	if akismetKey == "" {
+		return false
+	}
+
+	res, err := akismet.Check(&akismet.Comment{
+		Blog:               domain,
+		UserIP:             userIp,
+		UserAgent:          userAgent,
+		CommentType:        "comment",
+		CommentAuthor:      name,
+		CommentAuthorEmail: email,
+		CommentAuthorURL:   url,
+		CommentContent:     markdown,
+	}, akismetKey)
+
+	if err != nil {
+		logger.Errorf("error: cannot validate commenet using Akismet: %v", err)
+		return true
+	}
+
+	return res
+}

api/comment_new.go

@@ -89,8 +89,12 @@ func commentNewHandler(w http.ResponseWriter, r *http.Request) {
 	var state string
 
 	if *x.CommenterToken == "anonymous" {
-		state = "unapproved"
 		commenterHex = "anonymous"
+		if isSpam(*x.Domain, getIp(r), getUserAgent(r), "Anonymous", "", "", *x.Markdown) {
+			state = "flagged"
+		} else {
+			state = "unapproved"
+		}
 	} else {
 		c, err := commenterGetByCommenterToken(*x.CommenterToken)
 		if err != nil {
@@ -111,6 +115,9 @@ func commentNewHandler(w http.ResponseWriter, r *http.Request) {
 
 		if isModerator {
 			state = "approved"
+		} else {
+			if isSpam(*x.Domain, getIp(r), getUserAgent(r), c.Name, c.Email, c.Link, *x.Markdown) {
+				state = "flagged"
 			} else {
 				if d.RequireModeration {
 					state = "unapproved"
@@ -119,6 +126,7 @@ func commentNewHandler(w http.ResponseWriter, r *http.Request) {
 				}
 			}
 		}
+	}
 
 	commentHex, err := commentNew(commenterHex, domain, path, *x.ParentHex, *x.Markdown, state, time.Now().UTC())
 	if err != nil {
@@ -126,5 +134,5 @@ func commentNewHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	bodyMarshal(w, response{"success": true, "commentHex": commentHex, "approved": state == "approved"})
+	bodyMarshal(w, response{"success": true, "commentHex": commentHex, "state": state})
 }

api/config.go

@@ -43,6 +43,8 @@ func configParse() error {
 		"SMTP_PORT":         "",
 		"SMTP_FROM_ADDRESS": "",
 
+		"AKISMET_KEY": "",
+
 		"GOOGLE_KEY":    "",
 		"GOOGLE_SECRET": "",
 	}

api/utils_http.go

@@ -43,3 +43,16 @@ func bodyMarshal(w http.ResponseWriter, x map[string]interface{}) error {
 	w.Write(resp)
 	return nil
 }
+
+func getIp(r *http.Request) string {
+	ip := r.RemoteAddr
+	if r.Header.Get("X-Forwarded-For") != "" {
+		ip = r.Header.Get("X-Forwarded-For")
+	}
+
+	return ip
+}
+
+func getUserAgent(r *http.Request) string {
+	return r.Header.Get("User-Agent")
+}

frontend/js/commento.js

@@ -51,6 +51,7 @@
   var ID_REMOVE = "commento-comment-remove-";
   var ID_STICKY = "commento-comment-sticky-";
   var ID_CONTENTS = "commento-comment-contents-";
+  var ID_NAME = "commento-comment-name-";
   var ID_SUBMIT_BUTTON = "commento-submit-button-";
   var ID_FOOTER = "commento-footer";
 
@@ -519,14 +520,17 @@
         $(ID_COMMENTS_AREA).innerHTML = "";
         commentsRender();
 
-        if (!resp.approved) {
+        var message = "";
-          if (id == "root") {
+        if (resp.state == "unapproved")
-            var body = $(ID_SUPER_CONTAINER + id);
+          message = "Your comment is under moderation.";
-            prepend(body, messageCreate("Your comment is under moderation."));
+        else if (resp.state == "flagged")
-          } else {
+          message = "Your comment was flagged as spam and is under moderation.";
-            var body = $(ID_BODY + id);
+
-            append(body, messageCreate("Your comment is under moderation."));
+        if (message != "") {
-          }
+          if (id == "root")
+            prepend($(ID_SUPER_CONTAINER + id), messageCreate(message));
+          else
+            append($(ID_BODY + id), messageCreate(message));
         }
       });
     });
@@ -652,6 +656,7 @@
       remove.id = ID_REMOVE + comment.commentHex;
       sticky.id = ID_STICKY + comment.commentHex;
       contents.id = ID_CONTENTS + comment.commentHex;
+      name.id = ID_NAME + comment.commentHex;
 
       collapse.title = "Collapse";
       upvote.title = "Upvote";
@@ -692,8 +697,10 @@
       }
 
       classAdd(card, "card");
-      if (isModerator && comment.state == "unapproved")
+      if (isModerator && comment.state != "approved")
         classAdd(card, "dark-card");
+      if (comment.state == "flagged")
+        classAdd(name, "flagged");
       classAdd(header, "header");
       classAdd(name, "name");
       classAdd(subtitle, "subtitle");
@@ -773,7 +780,7 @@
         if (parentHex == "root")
           append(options, sticky);
         append(options, remove);
-        if (comment.state == "unapproved")
+        if (comment.state != "approved")
           append(options, approve);
       }
       else {
@@ -823,10 +830,12 @@
       }
 
       var card = $(ID_CARD + commentHex);
+      var name = $(ID_NAME + commentHex);
       var options = $(ID_OPTIONS + commentHex);
       var tick = $(ID_APPROVE + commentHex);
 
       classRemove(card, "dark-card");
+      classRemove(name, "flagged");
       remove(tick);
     });
   }

frontend/sass/commento.scss

@@ -124,6 +124,17 @@
       width: fit-content;
     }
 
+    .commento-flagged::after {
+      content: "Flagged";
+      text-transform: uppercase;
+      font-size: 10px;
+      background: $red-7;
+      color: white;
+      margin-left: 8px;
+      padding: 2px 6px 2px 6px;
+      border-radius: 100px;
+    }
+
     .commento-subtitle {
       display: block;
       color: #999;