diff --git a/server/parser/bolle.js b/server/parser/bolle.js
new file mode 100644
index 0000000..a5e32e6
--- /dev/null
+++ b/server/parser/bolle.js
@@ -0,0 +1,85 @@
+import axios from "axios";
+import crypto from "node:crypto";
+import { log } from "../logs.js";
+
+/* 
+This BOLLE (https://bolle-software.de/) parser tries to download
+the latest substitution plan HTML files from the "Pinnwand".
+
+It uses the same API that the mobile app (v0.3.6) uses. 
+To get your login credentials you need to log into your BOLLE account
+and register a new device in the settings (/einstellungen/geraete_personal).
+Click on "Manuelle Logindaten Einblenden" and use "ID" as apiUser
+and "Token" as apiKey. You need to make at least one request with
+this API token before closing the registration window or else the
+token will be invalidated immediately.
+*/
+
+// Files to download from the "Pinnwand"
+const filenames = ["vp_heute", "vp_morgen"];
+
+export class BolleClient {
+  constructor(bolleInstance, apiUser, apiKey) {
+    this.bolleInstance = bolleInstance;
+    this.apiUser = apiUser;
+    this.apiKey = apiKey;
+  }
+
+  async getFiles() {
+    try {
+      let contents = [];
+      for (let file of filenames) {
+        contents.push(await this.getFile(file));
+      }
+      return contents;
+    } catch (error) {
+      log("Parser / Bolle", "Error getting data: " + error);
+      return [];
+    }
+  }
+
+  async getFile(filename) {
+    // Generate the BOLLE api payload
+    let payload = {
+      api_payload: JSON.stringify({
+        method: "vertretungsplan_html",
+        payload: { content: filename },
+      }),
+    };
+    // Generate request headers
+    let headers = this.buildRequestHeaders(payload.api_payload);
+    // Send the POST request
+    let response = await axios.post(this.getRequestUrl(), payload, {
+      headers,
+    });
+    // The server responds with a json object
+    // containing the base64 encoded html data
+    let base64 = response.data["html_base64"];
+    // Decode the base64 data using the latin1 (ISO 8859-1) character set
+    return Buffer.from(base64, "base64").toString("latin1");
+  }
+  getRequestUrl() {
+    // The API that the bolle mobile app uses is available at /app/basic
+    return `https://${this.bolleInstance}/app/basic`;
+  }
+  buildRequestHeaders(payload) {
+    // Bolle needs the sha1 hash of the payload
+    // to be set as the "b-hash" header
+    let hash = crypto.createHash("sha1");
+    hash.update(payload);
+
+    return {
+      Accept: "application/json",
+      // Set the auth headers
+      "X-Auth-User": this.apiUser,
+      "X-Auth-Token": this.apiKey,
+      "App-Version": "4",
+      // Set the hash
+      "B-Hash": hash.digest("hex"),
+      "Content-Type": "application/json",
+      Connection: "Keep-Alive",
+      "Accept-Encoding": "gzip",
+      "User-Agent": "okhttp/4.9.2",
+    };
+  }
+}