api, frontend: add comment editing

api/comment_edit.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"net/http"
+)
+
+func commentEdit(commentHex string, markdown string) (string, error) {
+	if commentHex == "" {
+		return "", errorMissingField
+	}
+
+	html := markdownToHtml(markdown)
+
+	statement := `
+		UPDATE comments
+		SET markdown = $2, html = $3
+		WHERE commentHex=$1;
+	`
+	_, err := db.Exec(statement, commentHex, markdown, html)
+
+	if err != nil {
+		// TODO: make sure this is the error is actually non-existant commentHex
+		return "", errorNoSuchComment
+	}
+
+	return html, nil
+}
+
+func commentEditHandler(w http.ResponseWriter, r *http.Request) {
+	type request struct {
+		CommenterToken *string `json:"commenterToken"`
+		CommentHex     *string `json:"commentHex"`
+		Markdown       *string `json:"markdown"`
+	}
+
+	var x request
+	if err := bodyUnmarshal(r, &x); err != nil {
+		bodyMarshal(w, response{"success": false, "message": err.Error()})
+		return
+	}
+
+	c, err := commenterGetByCommenterToken(*x.CommenterToken)
+	if err != nil {
+		bodyMarshal(w, response{"success": false, "message": err.Error()})
+		return
+	}
+
+	cm, err := commentGetByCommentHex(*x.CommentHex)
+	if err != nil {
+		bodyMarshal(w, response{"success": false, "message": err.Error()})
+		return
+	}
+
+	if cm.CommenterHex != c.CommenterHex {
+		bodyMarshal(w, response{"success": false, "message": errorNotAuthorised.Error()})
+		return
+	}
+
+	html, err := commentEdit(*x.CommentHex, *x.Markdown)
+	if err != nil {
+		bodyMarshal(w, response{"success": false, "message": err.Error()})
+		return
+	}
+
+	bodyMarshal(w, response{"success": true, "html": html})
+}

api/router_api.go

@@ -51,6 +51,7 @@ func apiRouterInit(router *mux.Router) error {
 	router.HandleFunc("/api/oauth/sso/callback", ssoCallbackHandler).Methods("GET")
 
 	router.HandleFunc("/api/comment/new", commentNewHandler).Methods("POST")
+	router.HandleFunc("/api/comment/edit", commentEditHandler).Methods("POST")
 	router.HandleFunc("/api/comment/list", commentListHandler).Methods("POST")
 	router.HandleFunc("/api/comment/count", commentCountHandler).Methods("POST")
 	router.HandleFunc("/api/comment/vote", commentVoteHandler).Methods("POST")