feat: add facebook posting

server/src/modules/announceOnFacebook.ts

@@ -0,0 +1,81 @@
+/**
+ * @copyright nhcarrigan
+ * @license Naomi's Public License
+ * @author Naomi Carrigan
+ */
+
+interface FacebookErrorResponse {
+  error: {
+    code:    number;
+    message: string;
+    type:    string;
+  };
+}
+
+interface FacebookSuccessResponse {
+  id: string;
+}
+
+type FacebookResponse = FacebookErrorResponse | FacebookSuccessResponse;
+
+/**
+ * Forwards an announcement to our Facebook Page.
+ * @param content - The main body of the announcement.
+ * @returns A message indicating the success or failure of the operation.
+ */
+export const announceOnFacebook = async(content: string): Promise<string> => {
+  if (
+    process.env.FACEBOOK_PAGE_TOKEN === undefined
+    || process.env.FACEBOOK_PAGE_ID === undefined
+  ) {
+    return "Facebook credentials are not set.";
+  }
+
+  if (content.trim().length === 0) {
+    return "No content to send to Facebook.";
+  }
+
+  const pageId = process.env.FACEBOOK_PAGE_ID;
+  const accessToken = process.env.FACEBOOK_PAGE_TOKEN;
+
+  try {
+    const response = await fetch(
+      `https://graph.facebook.com/v21.0/${pageId}/feed`,
+      {
+        body: new URLSearchParams({
+          // eslint-disable-next-line @typescript-eslint/naming-convention -- Facebook API requires snake_case.
+          access_token: accessToken,
+          message:      content,
+        }),
+        headers: {
+          // eslint-disable-next-line @typescript-eslint/naming-convention -- HTTP header name.
+          "Content-Type": "application/x-www-form-urlencoded",
+        },
+        method: "POST",
+      },
+    );
+
+    // eslint-disable-next-line @typescript-eslint/consistent-type-assertions -- Fetch does not accept generic.
+    const result = (await response.json()) as FacebookResponse;
+
+    if ("error" in result) {
+      const errorMessage = result.error.message === ""
+        ? JSON.stringify(result.error)
+        : result.error.message;
+      return `Failed to send message to Facebook. ${errorMessage}`;
+    }
+
+    if ("id" in result) {
+      return `Successfully sent post to Facebook. Post ID: ${result.id}`;
+    }
+
+    return `Failed to send message to Facebook. Unexpected response: ${JSON.stringify(result)}`;
+  } catch (error: unknown) {
+    return `Failed to send message to Facebook. ${
+      error instanceof Error
+        ? error.message
+        : String(error)
+    }`;
+  }
+};
+

server/src/routes/announcement.ts

@@ -8,6 +8,7 @@ import { blockedIps } from "../cache/blockedIps.js";
 import { database } from "../db/database.js";
 import { announceOnBluesky } from "../modules/announceOnBluesky.js";
 import { announceOnDiscord } from "../modules/announceOnDiscord.js";
+import { announceOnFacebook } from "../modules/announceOnFacebook.js";
 import { announceOnReddit } from "../modules/announceOnReddit.js";
 import { announceOnTwitter } from "../modules/announceOnTwitter.js";
 import { generateAnnouncements } from "../modules/generateAnnouncements.js";
@@ -86,7 +87,13 @@ export const announcementRoutes: FastifyPluginAsync = async(server) => {
         });
       }
 
-      const { bluesky, discord, reddit, twitter } = announcement.response;
+      const {
+        bluesky,
+        discord,
+        facebook,
+        reddit,
+        twitter,
+      } = announcement.response;
       const { title: discordTitle, content: discordContent } = discord;
       const { title: redditTitle, content: redditContent } = reddit;
 
@@ -110,9 +117,10 @@ export const announcementRoutes: FastifyPluginAsync = async(server) => {
       );
       const blueskyPost = await announceOnBluesky(bluesky);
       const twitterPost = await announceOnTwitter(twitter);
+      const facebookPost = await announceOnFacebook(facebook);
       return await reply.status(201).send({
         cost:    announcement.cost,
-        message: `Announcement processed. Discord: ${discordPost}, Reddit: ${redditPost}, Bluesky: ${blueskyPost}, Twitter: ${twitterPost}`,
+        message: `Announcement processed. Discord: ${discordPost}, Reddit: ${redditPost}, Bluesky: ${blueskyPost}, Twitter: ${twitterPost}, Facebook: ${facebookPost}`,
         rawPost: announcement.response,
       });
     },