feat(integration): add Discord integration

internal/integration/discord/discord.go

@@ -0,0 +1,109 @@
+// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+// Discord Webhooks documentation: https://discord.com/developers/docs/resources/webhook
+
+package discord // import "miniflux.app/v2/internal/integration/discord"
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"log/slog"
+	"net/http"
+	"time"
+
+	"miniflux.app/v2/internal/model"
+	"miniflux.app/v2/internal/urllib"
+	"miniflux.app/v2/internal/version"
+)
+
+const defaultClientTimeout = 10 * time.Second
+const discordMsgColor = 5793266
+
+type Client struct {
+	webhookURL string
+}
+
+func NewClient(webhookURL string) *Client {
+	return &Client{webhookURL: webhookURL}
+}
+
+func (c *Client) SendDiscordMsg(feed *model.Feed, entries model.Entries) error {
+	for _, entry := range entries {
+		requestBody, err := json.Marshal(&discordMessage{
+			Embeds: []discordEmbed{
+				{
+					Title: "RSS feed update from Miniflux",
+					Color: discordMsgColor,
+					Fields: []discordFields{
+						{
+							Name:  "Updated feed",
+							Value: feed.Title,
+						},
+						{
+							Name:  "Article link",
+							Value: "[" + entry.Title + "]" + "(" + entry.URL + ")",
+						},
+						{
+							Name:   "Author",
+							Value:  entry.Author,
+							Inline: true,
+						},
+						{
+							Name:   "Source website",
+							Value:  urllib.RootURL(feed.SiteURL),
+							Inline: true,
+						},
+					},
+				},
+			},
+		})
+		if err != nil {
+			return fmt.Errorf("discord: unable to encode request body: %v", err)
+		}
+
+		request, err := http.NewRequest(http.MethodPost, c.webhookURL, bytes.NewReader(requestBody))
+		if err != nil {
+			return fmt.Errorf("discord: unable to create request: %v", err)
+		}
+
+		request.Header.Set("Content-Type", "application/json")
+		request.Header.Set("User-Agent", "Miniflux/"+version.Version)
+
+		slog.Debug("Sending Discord notification",
+			slog.String("webhookURL", c.webhookURL),
+			slog.String("title", feed.Title),
+			slog.String("entry_url", entry.URL),
+		)
+
+		httpClient := &http.Client{Timeout: defaultClientTimeout}
+		response, err := httpClient.Do(request)
+		if err != nil {
+			return fmt.Errorf("discord: unable to send request: %v", err)
+		}
+		defer response.Body.Close()
+
+		if response.StatusCode >= 400 {
+			return fmt.Errorf("discord: unable to send a notification: url=%s status=%d", c.webhookURL, response.StatusCode)
+		}
+	}
+
+	return nil
+}
+
+type discordFields struct {
+	Name   string `json:"name"`
+	Value  string `json:"value"`
+	Inline bool   `json:"inline,omitempty"`
+}
+
+type discordEmbed struct {
+	Title  string          `json:"title"`
+	Color  int             `json:"color"`
+	Fields []discordFields `json:"fields"`
+}
+
+type discordMessage struct {
+	Embeds []discordEmbed `json:"embeds"`
+}