fixing #319 & #318

lib/notification/adapter/telegram.js

@@ -9,6 +9,7 @@ import fetch from 'node-fetch';
 import pThrottle from 'p-throttle';
 import { normalizeImageUrl } from '../../utils.js';
 import logger from '../../services/logger.js';
+import { shouldUseMultipart, buildPhotoFormData } from './telegramPhotoUploader.js';
 
 const RATE_LIMIT_INTERVAL = 1000;
 const chatThrottleMap = new Map();
@@ -177,11 +178,13 @@ export const send = ({ serviceName, newListings = [], notificationConfig, jobKey
   const jobName = job == null ? jobKey : job.name;
 
   const throttledCall = getThrottled(chatId, async function (endpoint, body) {
-    const res = await fetch(`https://api.telegram.org/bot${token}/${endpoint}`, {
-      method: 'post',
-      body: JSON.stringify(body),
-      headers: { 'Content-Type': 'application/json' },
-    });
+    // FormData (multipart) vs JSON. node-fetch sets its own multipart boundary
+    // header, so we must NOT supply Content-Type ourselves in that case.
+    const isFormData = body instanceof FormData;
+    const opts = isFormData
+      ? { method: 'post', body }
+      : { method: 'post', body: JSON.stringify(body), headers: { 'Content-Type': 'application/json' } };
+    const res = await fetch(`https://api.telegram.org/bot${token}/${endpoint}`, opts);
 
     if (!res.ok) {
       const errorBody = await res.text();
@@ -208,16 +211,28 @@ export const send = ({ serviceName, newListings = [], notificationConfig, jobKey
       });
     }
 
-    return await throttledCall('sendPhoto', {
-      chat_id: chatId,
-      photo: img,
-      caption: plainText
-        ? buildCaptionPlain(jobName, serviceName, o, baseUrl)
-        : buildCaption(jobName, serviceName, o, baseUrl),
-      ...(plainText ? {} : { parse_mode: 'HTML' }),
-      ...(message_thread_id ? { message_thread_id } : {}),
-    }).catch(async (e) => {
-      logger.error(`Error sending photo to Telegram and use a fallback: ${e.message}`);
+    const caption = plainText
+      ? buildCaptionPlain(jobName, serviceName, o, baseUrl)
+      : buildCaption(jobName, serviceName, o, baseUrl);
+    const parseMode = plainText ? undefined : 'HTML';
+
+    // .webp URLs (Immowelt/Cloudimage) fail Telegram's URL-based sendPhoto with
+    // "failed to get HTTP URL content". Upload the bytes via multipart instead;
+    // the rendered chat message is identical.
+    const photoCall = shouldUseMultipart(img)
+      ? buildPhotoFormData({ chatId, imageUrl: img, caption, parseMode, messageThreadId: message_thread_id }).then(
+          (fd) => throttledCall('sendPhoto', fd),
+        )
+      : throttledCall('sendPhoto', {
+          chat_id: chatId,
+          photo: img,
+          caption,
+          ...(parseMode ? { parse_mode: parseMode } : {}),
+          ...(message_thread_id ? { message_thread_id } : {}),
+        });
+
+    return await photoCall.catch(async (e) => {
+      logger.warn(`Error sending photo to Telegram and use a fallback: ${e.message}`);
       return await throttledCall('sendMessage', textPayload).catch((e) => {
         logger.error(`Error sending message to Telegram: ${e.message}`);
         throw e;

lib/notification/adapter/telegramPhotoUploader.js

@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2026 by Christian Kellner.
+ * Licensed under Apache-2.0 with Commons Clause and Attribution/Naming Clause
+ */
+
+/**
+ * Helpers for sending photos to Telegram via `multipart/form-data` instead of
+ * the HTTP-URL path. Used when the URL is one that Telegram's URL-fetcher will
+ * reject - notably `.webp` images from Cloudimage (mms.immowelt.de), which
+ * Telegram refuses with "Bad Request: failed to get HTTP URL content".
+ *
+ * The HTTP-URL path is faster and is still the default in telegram.js; this
+ * module is the fallback for URLs whose extension makes Telegram fail.
+ */
+
+/** Telegram's sendPhoto limit when uploading bytes via multipart/form-data. */
+const TELEGRAM_MULTIPART_MAX_BYTES = 10 * 1024 * 1024;
+
+/** Accept header used when re-fetching the image ourselves.
+ *  Deliberately excludes `image/webp` so CDNs that content-negotiate
+ *  (like Cloudimage on mms.immowelt.de) transcode WEBP to JPEG. */
+const NON_WEBP_ACCEPT = 'image/jpeg,image/png,image/*;q=0.8';
+
+/**
+ * Returns true if the URL's path ends in a `.webp` extension. Such URLs need
+ * multipart upload because Telegram identifies media types from the URL path
+ * and rejects `.webp` in sendPhoto via HTTP URL.
+ *
+ * Conservative: returns false for null/empty/non-string input, malformed URLs,
+ * and non-https schemes.
+ *
+ * @param {string|null|undefined} url
+ * @returns {boolean}
+ */
+export function shouldUseMultipart(url) {
+  if (typeof url !== 'string' || url.length === 0) return false;
+  let parsed;
+  try {
+    parsed = new URL(url);
+  } catch {
+    return false;
+  }
+  if (parsed.protocol !== 'https:') return false;
+  return /\.webp$/i.test(parsed.pathname);
+}
+
+/**
+ * Fetch an image from `imageUrl` and build a `FormData` body suitable for
+ * POSTing to `https://api.telegram.org/bot<token>/sendPhoto`.
+ *
+ * - Sends an `Accept` header that excludes `image/webp` so origin/CDN servers
+ *   that content-negotiate return JPEG bytes.
+ * - Rejects images larger than Telegram's 10 MB multipart limit, both
+ *   advertised via `Content-Length` and (defensively) after download.
+ * - The `photo` field is named with a `.jpg` extension because Telegram
+ *   identifies file type from the filename.
+ *
+ * Throws if the image fetch fails, the size limit is exceeded, or the URL is
+ * unreachable. The caller is responsible for catching and falling back.
+ *
+ * @param {Object} args
+ * @param {string|number} args.chatId
+ * @param {string} args.imageUrl
+ * @param {string} args.caption
+ * @param {string} [args.parseMode]      - Telegram parse_mode, e.g. 'HTML'.
+ * @param {number} [args.messageThreadId] - Telegram supergroup topic id.
+ * @returns {Promise<FormData>}
+ */
+export async function buildPhotoFormData({ chatId, imageUrl, caption, parseMode, messageThreadId }) {
+  const res = await fetch(imageUrl, {
+    method: 'GET',
+    headers: { Accept: NON_WEBP_ACCEPT },
+  });
+
+  if (!res.ok) {
+    throw new Error(`Failed to fetch image for multipart upload (${res.status}): ${imageUrl}`);
+  }
+
+  const advertised = Number(res.headers.get('content-length'));
+  if (Number.isFinite(advertised) && advertised > TELEGRAM_MULTIPART_MAX_BYTES) {
+    throw new Error(
+      `Image exceeds Telegram multipart size limit (advertised ${advertised} bytes, max ${TELEGRAM_MULTIPART_MAX_BYTES}): ${imageUrl}`,
+    );
+  }
+
+  const buf = await res.arrayBuffer();
+  if (buf.byteLength > TELEGRAM_MULTIPART_MAX_BYTES) {
+    throw new Error(
+      `Image exceeds Telegram multipart size limit (downloaded ${buf.byteLength} bytes, max ${TELEGRAM_MULTIPART_MAX_BYTES}): ${imageUrl}`,
+    );
+  }
+
+  // Telegram identifies the media type from the filename extension. We always
+  // upload as .jpg because the Accept header forces JPEG bytes from CDNs that
+  // honor it; for the rare CDN that ignores Accept and still returns WEBP, the
+  // .jpg filename is a small lie but Telegram's image pipeline accepts it.
+  const blob = new Blob([buf], { type: 'image/jpeg' });
+
+  const fd = new FormData();
+  fd.append('chat_id', String(chatId));
+  fd.append('caption', caption);
+  if (parseMode) fd.append('parse_mode', parseMode);
+  if (messageThreadId != null) fd.append('message_thread_id', String(messageThreadId));
+  fd.append('photo', blob, 'photo.jpg');
+  return fd;
+}

lib/services/immoscout/immoscout-web-translator.js

@@ -141,6 +141,43 @@ const WEB_PATH_TO_APARTMENT_EQUIPMENT_MAP = {
   'barrierefreie-wohnung-mieten': { equipment: ['handicappedaccessible'] },
 };
 
+// SEO-optimized rental paths used by the ImmoScout web UI when the user
+// configures a maximum warmrent. Example: "wohnung-bis-800-euro-warm" means
+// "apartment for rent up to 800 EUR warmrent". The web UI generates these
+// paths instead of explicit `price` / `pricetype` query parameters.
+// Note: only the warmrent variant uses an SEO slug; max coldrent searches
+// use the regular "wohnung-mieten" path with explicit `price` and
+// `pricetype=rentpermonth` query params, which the existing translator
+// already handles.
+const SEO_RENT_TYPE_TO_REAL_ESTATE_TYPE = {
+  wohnung: 'apartmentrent',
+  haus: 'houserent',
+};
+const SEO_MAX_WARMRENT_PATH_PATTERN = /^(?<type>wohnung|haus)-bis-(?<price>\d+)-euro-warm$/;
+
+/**
+ * Parses SEO-optimized ImmoScout web paths that encode a maximum warmrent, such
+ * as "wohnung-bis-800-euro-warm". Returns the corresponding mobile API real
+ * estate type and the implicit price/pricetype parameters, or null if the path
+ * does not match the known SEO max-warmrent pattern.
+ *
+ * @param {string} realTypeKey The last segment of the URL path.
+ * @returns {{ realType: string, additionalParams: Record<string, string> } | null}
+ */
+function parseSeoMaxWarmrentPath(realTypeKey) {
+  const match = realTypeKey.match(SEO_MAX_WARMRENT_PATH_PATTERN);
+  if (!match) return null;
+
+  const { type, price } = match.groups;
+  return {
+    realType: SEO_RENT_TYPE_TO_REAL_ESTATE_TYPE[type],
+    additionalParams: {
+      price: `-${price}`,
+      pricetype: 'calculatedtotalrent',
+    },
+  };
+}
+
 export function convertWebToMobile(webUrl) {
   let url;
   try {
@@ -164,7 +201,14 @@ export function convertWebToMobile(webUrl) {
       additionalParamsFromWebPath = WEB_PATH_TO_APARTMENT_EQUIPMENT_MAP[realTypeKey];
       realType = REAL_ESTATE_TYPE['wohnung-mieten'];
     } else {
-      throw new Error(`Real estate type not found: ${realTypeKey}`);
+      // Test for SEO max-warmrent path, e.g. "wohnung-bis-800-euro-warm"
+      const seoMaxWarmrent = parseSeoMaxWarmrentPath(realTypeKey);
+      if (seoMaxWarmrent) {
+        realType = seoMaxWarmrent.realType;
+        additionalParamsFromWebPath = seoMaxWarmrent.additionalParams;
+      } else {
+        throw new Error(`Real estate type not found: ${realTypeKey}`);
+      }
     }
   }
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "fredy",
-  "version": "22.2.1",
+  "version": "22.2.2",
   "description": "[F]ind [R]eal [E]states [d]amn eas[y].",
   "scripts": {
     "prepare": "husky",

test/notification/telegram.test.js

@@ -0,0 +1,360 @@
+/*
+ * Copyright (c) 2026 by Christian Kellner.
+ * Licensed under Apache-2.0 with Commons Clause and Attribution/Naming Clause
+ */
+
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+
+// Mock external deps BEFORE importing the module under test.
+vi.mock('node-fetch', () => ({ default: vi.fn() }));
+vi.mock('../../lib/services/storage/jobStorage.js', () => ({
+  getJob: (jobKey) => ({ id: jobKey, name: jobKey }),
+}));
+vi.mock('../../lib/services/markdown.js', () => ({
+  markdown2Html: () => '',
+}));
+
+// Helpers to build mock fetch responses.
+function jsonOk(body = { ok: true }) {
+  return {
+    ok: true,
+    status: 200,
+    text: async () => JSON.stringify(body),
+  };
+}
+
+function jsonErr(status, body) {
+  return {
+    ok: false,
+    status,
+    text: async () => JSON.stringify(body),
+  };
+}
+
+function imageOk(bytes = new Uint8Array([0xff, 0xd8, 0xff])) {
+  return {
+    ok: true,
+    status: 200,
+    headers: {
+      get: (h) => {
+        const k = h.toLowerCase();
+        if (k === 'content-type') return 'image/jpeg';
+        if (k === 'content-length') return String(bytes.byteLength);
+        return null;
+      },
+    },
+    arrayBuffer: async () => bytes.buffer.slice(bytes.byteOffset, bytes.byteOffset + bytes.byteLength),
+  };
+}
+
+// Globals are mocked too so buildPhotoFormData (which uses global fetch) can be
+// intercepted by the same single mock.
+let mockNodeFetch;
+let mockGlobalFetch;
+let send;
+
+beforeEach(async () => {
+  // Reset modules to get a fresh import with our mocks applied.
+  vi.resetModules();
+  const nodeFetchMod = await import('node-fetch');
+  mockNodeFetch = nodeFetchMod.default;
+  mockNodeFetch.mockReset();
+
+  mockGlobalFetch = vi.fn();
+  vi.stubGlobal('fetch', mockGlobalFetch);
+
+  ({ send } = await import('../../lib/notification/adapter/telegram.js'));
+});
+
+afterEach(() => {
+  vi.unstubAllGlobals();
+  vi.useRealTimers();
+});
+
+const baseConfig = {
+  id: 'telegram',
+  fields: { token: 'TKN', chatId: '999' },
+};
+
+describe('telegram send() - HTTP URL path (default for .jpg / .png)', () => {
+  it('POSTs JSON to sendPhoto for a .jpg image URL', async () => {
+    mockNodeFetch.mockResolvedValueOnce(jsonOk());
+
+    await send({
+      serviceName: 'immowelt',
+      newListings: [
+        {
+          id: 'a',
+          title: 'Listing',
+          link: 'https://example.com/a',
+          address: 'Addr',
+          price: '500€',
+          size: '50m²',
+          image: 'https://mms.immowelt.de/x/y/z/w/abc.jpg?ci_seal=hash&w=525&h=394',
+        },
+      ],
+      notificationConfig: [baseConfig],
+      jobKey: 'Berlin',
+    });
+
+    expect(mockNodeFetch).toHaveBeenCalledTimes(1);
+    const [url, opts] = mockNodeFetch.mock.calls[0];
+    expect(url).toBe('https://api.telegram.org/botTKN/sendPhoto');
+    expect(opts.method).toBe('post');
+    expect(opts.headers?.['Content-Type']).toBe('application/json');
+    const body = JSON.parse(opts.body);
+    expect(body.chat_id).toBe('999');
+    expect(body.photo).toBe('https://mms.immowelt.de/x/y/z/w/abc.jpg?ci_seal=hash&w=525&h=394');
+    expect(body.parse_mode).toBe('HTML');
+  });
+
+  it('does NOT pre-fetch the image when using HTTP URL path', async () => {
+    mockNodeFetch.mockResolvedValueOnce(jsonOk());
+
+    await send({
+      serviceName: 'immowelt',
+      newListings: [
+        {
+          id: 'a',
+          title: 't',
+          link: 'l',
+          address: 'a',
+          price: '',
+          size: '',
+          image: 'https://example.com/x.jpg',
+        },
+      ],
+      notificationConfig: [baseConfig],
+      jobKey: 'Berlin',
+    });
+
+    // global fetch (used by buildPhotoFormData) must not be called
+    expect(mockGlobalFetch).not.toHaveBeenCalled();
+  });
+
+  it('falls back to sendMessage when sendPhoto fails', async () => {
+    mockNodeFetch
+      .mockResolvedValueOnce(jsonErr(400, { ok: false, description: 'boom' }))
+      .mockResolvedValueOnce(jsonOk());
+
+    await send({
+      serviceName: 'immowelt',
+      newListings: [
+        {
+          id: 'a',
+          title: 't',
+          link: 'l',
+          address: 'a',
+          price: '',
+          size: '',
+          image: 'https://example.com/x.jpg',
+        },
+      ],
+      notificationConfig: [baseConfig],
+      jobKey: 'Berlin',
+    });
+
+    expect(mockNodeFetch).toHaveBeenCalledTimes(2);
+    expect(mockNodeFetch.mock.calls[0][0]).toBe('https://api.telegram.org/botTKN/sendPhoto');
+    expect(mockNodeFetch.mock.calls[1][0]).toBe('https://api.telegram.org/botTKN/sendMessage');
+  });
+});
+
+describe('telegram send() - multipart path (.webp URLs)', () => {
+  it('pre-fetches the image then POSTs FormData to sendPhoto for a .webp URL', async () => {
+    // 1st: GET image via global fetch
+    mockGlobalFetch.mockResolvedValueOnce(imageOk());
+    // 2nd: POST sendPhoto via node-fetch
+    mockNodeFetch.mockResolvedValueOnce(jsonOk());
+
+    await send({
+      serviceName: 'immowelt',
+      newListings: [
+        {
+          id: 'a',
+          title: 'Listing',
+          link: 'https://example.com/a',
+          address: 'Addr',
+          price: '500€',
+          size: '50m²',
+          image: 'https://mms.immowelt.de/1/1/6/5/abc.webp?ci_seal=hash&w=525&h=394',
+        },
+      ],
+      notificationConfig: [baseConfig],
+      jobKey: 'Berlin',
+    });
+
+    // image was fetched
+    expect(mockGlobalFetch).toHaveBeenCalledTimes(1);
+    expect(mockGlobalFetch.mock.calls[0][0]).toBe('https://mms.immowelt.de/1/1/6/5/abc.webp?ci_seal=hash&w=525&h=394');
+
+    // sendPhoto called via node-fetch with FormData
+    expect(mockNodeFetch).toHaveBeenCalledTimes(1);
+    const [url, opts] = mockNodeFetch.mock.calls[0];
+    expect(url).toBe('https://api.telegram.org/botTKN/sendPhoto');
+    expect(opts.method).toBe('post');
+    expect(opts.body).toBeInstanceOf(FormData);
+    // No explicit Content-Type header - fetch sets multipart boundary itself
+    expect(opts.headers).toBeUndefined();
+    expect(opts.body.get('chat_id')).toBe('999');
+    expect(opts.body.get('parse_mode')).toBe('HTML');
+    const photo = opts.body.get('photo');
+    expect(photo).toBeTruthy();
+    expect(photo.size).toBeGreaterThan(0);
+  });
+
+  it('falls back to sendMessage when the image pre-fetch fails for a .webp URL', async () => {
+    // image fetch fails (404 from CDN)
+    mockGlobalFetch.mockResolvedValueOnce({
+      ok: false,
+      status: 404,
+      headers: { get: () => null },
+      arrayBuffer: async () => new ArrayBuffer(0),
+    });
+    // then sendMessage succeeds via node-fetch
+    mockNodeFetch.mockResolvedValueOnce(jsonOk());
+
+    await send({
+      serviceName: 'immowelt',
+      newListings: [
+        {
+          id: 'a',
+          title: 't',
+          link: 'l',
+          address: 'a',
+          price: '',
+          size: '',
+          image: 'https://example.com/gone.webp',
+        },
+      ],
+      notificationConfig: [baseConfig],
+      jobKey: 'Berlin',
+    });
+
+    expect(mockNodeFetch).toHaveBeenCalledTimes(1);
+    expect(mockNodeFetch.mock.calls[0][0]).toBe('https://api.telegram.org/botTKN/sendMessage');
+  });
+
+  it('falls back to sendMessage when multipart sendPhoto returns a Telegram error', async () => {
+    mockGlobalFetch.mockResolvedValueOnce(imageOk());
+    mockNodeFetch
+      .mockResolvedValueOnce(jsonErr(400, { description: 'broke' })) // multipart sendPhoto
+      .mockResolvedValueOnce(jsonOk()); // sendMessage fallback
+
+    await send({
+      serviceName: 'immowelt',
+      newListings: [
+        {
+          id: 'a',
+          title: 't',
+          link: 'l',
+          address: 'a',
+          price: '',
+          size: '',
+          image: 'https://example.com/x.webp',
+        },
+      ],
+      notificationConfig: [baseConfig],
+      jobKey: 'Berlin',
+    });
+
+    expect(mockNodeFetch).toHaveBeenCalledTimes(2);
+    expect(mockNodeFetch.mock.calls[1][0]).toBe('https://api.telegram.org/botTKN/sendMessage');
+  });
+});
+
+describe('telegram send() - mixed batch (regression-safety)', () => {
+  it('handles a batch with both .jpg and .webp - jpg uses URL, webp uses multipart', async () => {
+    // .webp image fetch
+    mockGlobalFetch.mockResolvedValueOnce(imageOk());
+    // both sendPhoto calls succeed
+    mockNodeFetch
+      .mockResolvedValueOnce(jsonOk()) // could be either listing first
+      .mockResolvedValueOnce(jsonOk());
+
+    await send({
+      serviceName: 'immowelt',
+      newListings: [
+        {
+          id: 'jpg-listing',
+          title: 'a',
+          link: 'l',
+          address: 'a',
+          price: '',
+          size: '',
+          image: 'https://example.com/a.jpg',
+        },
+        {
+          id: 'webp-listing',
+          title: 'b',
+          link: 'l',
+          address: 'a',
+          price: '',
+          size: '',
+          image: 'https://example.com/b.webp',
+        },
+      ],
+      notificationConfig: [baseConfig],
+      jobKey: 'Berlin',
+    });
+
+    expect(mockGlobalFetch).toHaveBeenCalledTimes(1); // only webp pre-fetches
+    expect(mockNodeFetch).toHaveBeenCalledTimes(2);
+
+    // Verify one call had FormData and one had JSON body
+    const bodies = mockNodeFetch.mock.calls.map((c) => c[1].body);
+    const hasFormData = bodies.some((b) => b instanceof FormData);
+    const hasJson = bodies.some((b) => typeof b === 'string' && b.startsWith('{'));
+    expect(hasFormData).toBe(true);
+    expect(hasJson).toBe(true);
+  });
+
+  it('uses sendMessage (not sendPhoto) when image is null', async () => {
+    mockNodeFetch.mockResolvedValueOnce(jsonOk());
+
+    await send({
+      serviceName: 'immowelt',
+      newListings: [
+        {
+          id: 'a',
+          title: 't',
+          link: 'l',
+          address: 'a',
+          price: '',
+          size: '',
+          image: null,
+        },
+      ],
+      notificationConfig: [baseConfig],
+      jobKey: 'Berlin',
+    });
+
+    expect(mockNodeFetch).toHaveBeenCalledTimes(1);
+    expect(mockNodeFetch.mock.calls[0][0]).toBe('https://api.telegram.org/botTKN/sendMessage');
+    expect(mockGlobalFetch).not.toHaveBeenCalled();
+  });
+});
+
+describe('telegram send() - config validation', () => {
+  it('throws when telegram adapter config is missing', () => {
+    expect(() =>
+      send({
+        serviceName: 's',
+        newListings: [],
+        notificationConfig: [],
+        jobKey: 'k',
+      }),
+    ).toThrow(/configuration missing/);
+  });
+
+  it('throws when token or chatId is missing', () => {
+    expect(() =>
+      send({
+        serviceName: 's',
+        newListings: [],
+        notificationConfig: [{ id: 'telegram', fields: { token: '' } }],
+        jobKey: 'k',
+      }),
+    ).toThrow(/token.*chatId/);
+  });
+});

test/notification/telegramPhotoUploader.test.js

@@ -0,0 +1,287 @@
+/*
+ * Copyright (c) 2026 by Christian Kellner.
+ * Licensed under Apache-2.0 with Commons Clause and Attribution/Naming Clause
+ */
+
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import { shouldUseMultipart, buildPhotoFormData } from '../../lib/notification/adapter/telegramPhotoUploader.js';
+
+describe('shouldUseMultipart', () => {
+  it('returns true for .webp URL with query string', () => {
+    expect(shouldUseMultipart('https://mms.immowelt.de/1/1/6/5/abc.webp?ci_seal=hash&w=525&h=394')).toBe(true);
+  });
+
+  it('returns true for .webp URL without query string', () => {
+    expect(shouldUseMultipart('https://example.com/photo.webp')).toBe(true);
+  });
+
+  it('returns true for uppercase .WEBP extension', () => {
+    expect(shouldUseMultipart('https://example.com/IMG.WEBP?x=1')).toBe(true);
+  });
+
+  it('returns false for .jpg URL with query string', () => {
+    expect(shouldUseMultipart('https://mms.immowelt.de/a/b/c/d/xyz.jpg?ci_seal=hash&w=525&h=394')).toBe(false);
+  });
+
+  it('returns false for .jpeg URL', () => {
+    expect(shouldUseMultipart('https://example.com/photo.jpeg')).toBe(false);
+  });
+
+  it('returns false for .png URL with query string', () => {
+    expect(shouldUseMultipart('https://example.com/photo.png?w=100')).toBe(false);
+  });
+
+  it('returns false for .gif URL', () => {
+    expect(shouldUseMultipart('https://example.com/photo.gif')).toBe(false);
+  });
+
+  it('returns false for null', () => {
+    expect(shouldUseMultipart(null)).toBe(false);
+  });
+
+  it('returns false for undefined', () => {
+    expect(shouldUseMultipart(undefined)).toBe(false);
+  });
+
+  it('returns false for empty string', () => {
+    expect(shouldUseMultipart('')).toBe(false);
+  });
+
+  it('returns false for malformed URL', () => {
+    expect(shouldUseMultipart('not a url')).toBe(false);
+  });
+
+  it('returns false for URL where webp is in the query but not the path', () => {
+    expect(shouldUseMultipart('https://example.com/photo.jpg?format=webp')).toBe(false);
+  });
+
+  it('returns false for URL with no extension at all', () => {
+    expect(shouldUseMultipart('https://example.com/photo')).toBe(false);
+  });
+
+  it('returns false for non-https schemes', () => {
+    // file/data/ftp URLs should not be relevant; safer to skip multipart
+    expect(shouldUseMultipart('http://example.com/photo.webp')).toBe(false);
+  });
+});
+
+describe('buildPhotoFormData', () => {
+  let mockFetch;
+
+  beforeEach(() => {
+    mockFetch = vi.fn();
+    vi.stubGlobal('fetch', mockFetch);
+  });
+
+  afterEach(() => {
+    vi.unstubAllGlobals();
+  });
+
+  function makeImageResponse({ contentType = 'image/jpeg', bytes = new Uint8Array([0xff, 0xd8, 0xff]) } = {}) {
+    const buf = bytes.buffer.slice(bytes.byteOffset, bytes.byteOffset + bytes.byteLength);
+    return {
+      ok: true,
+      status: 200,
+      headers: {
+        get: (h) =>
+          h.toLowerCase() === 'content-type'
+            ? contentType
+            : h.toLowerCase() === 'content-length'
+              ? String(bytes.byteLength)
+              : null,
+      },
+      arrayBuffer: async () => buf,
+    };
+  }
+
+  it('fetches image with Accept header that excludes webp so the CDN transcodes to JPEG', async () => {
+    mockFetch.mockResolvedValueOnce(makeImageResponse());
+
+    await buildPhotoFormData({
+      chatId: '123',
+      imageUrl: 'https://example.com/photo.webp',
+      caption: 'hi',
+      parseMode: 'HTML',
+    });
+
+    expect(mockFetch).toHaveBeenCalledTimes(1);
+    const [url, opts] = mockFetch.mock.calls[0];
+    expect(url).toBe('https://example.com/photo.webp');
+    expect(opts?.headers?.Accept || opts?.headers?.accept).toMatch(/image\/jpeg/);
+    expect(opts?.headers?.Accept || opts?.headers?.accept).not.toMatch(/image\/webp/);
+  });
+
+  it('returns FormData containing chat_id, caption, parse_mode, and photo fields', async () => {
+    mockFetch.mockResolvedValueOnce(makeImageResponse());
+
+    const fd = await buildPhotoFormData({
+      chatId: '12345',
+      imageUrl: 'https://example.com/abc.webp',
+      caption: 'My caption',
+      parseMode: 'HTML',
+    });
+
+    expect(fd).toBeInstanceOf(FormData);
+    expect(fd.get('chat_id')).toBe('12345');
+    expect(fd.get('caption')).toBe('My caption');
+    expect(fd.get('parse_mode')).toBe('HTML');
+    const photo = fd.get('photo');
+    expect(photo).toBeTruthy();
+    // File-like (Blob); has a name and a size
+    expect(typeof photo.name).toBe('string');
+    expect(photo.size).toBeGreaterThan(0);
+  });
+
+  it('uses a .jpg filename (Telegram uses URL/filename extension for type detection)', async () => {
+    mockFetch.mockResolvedValueOnce(makeImageResponse());
+
+    const fd = await buildPhotoFormData({
+      chatId: '1',
+      imageUrl: 'https://example.com/source.webp',
+      caption: 'c',
+      parseMode: 'HTML',
+    });
+
+    const photo = fd.get('photo');
+    expect(photo.name).toMatch(/\.jpg$/i);
+  });
+
+  it('includes message_thread_id when provided', async () => {
+    mockFetch.mockResolvedValueOnce(makeImageResponse());
+
+    const fd = await buildPhotoFormData({
+      chatId: '1',
+      imageUrl: 'https://example.com/source.webp',
+      caption: 'c',
+      parseMode: 'HTML',
+      messageThreadId: 42,
+    });
+
+    expect(fd.get('message_thread_id')).toBe('42');
+  });
+
+  it('omits message_thread_id when not provided', async () => {
+    mockFetch.mockResolvedValueOnce(makeImageResponse());
+
+    const fd = await buildPhotoFormData({
+      chatId: '1',
+      imageUrl: 'https://example.com/source.webp',
+      caption: 'c',
+      parseMode: 'HTML',
+    });
+
+    expect(fd.get('message_thread_id')).toBeNull();
+  });
+
+  it('omits parse_mode when not provided (plain text mode)', async () => {
+    mockFetch.mockResolvedValueOnce(makeImageResponse());
+
+    const fd = await buildPhotoFormData({
+      chatId: '1',
+      imageUrl: 'https://example.com/source.webp',
+      caption: 'c',
+    });
+
+    expect(fd.get('parse_mode')).toBeNull();
+  });
+
+  it('throws when the image fetch returns non-200', async () => {
+    mockFetch.mockResolvedValueOnce({
+      ok: false,
+      status: 404,
+      headers: { get: () => null },
+      arrayBuffer: async () => new ArrayBuffer(0),
+    });
+
+    await expect(
+      buildPhotoFormData({
+        chatId: '1',
+        imageUrl: 'https://example.com/gone.webp',
+        caption: 'c',
+        parseMode: 'HTML',
+      }),
+    ).rejects.toThrow(/404/);
+  });
+
+  it('throws when the image fetch throws (network error)', async () => {
+    mockFetch.mockRejectedValueOnce(new Error('ECONNREFUSED'));
+
+    await expect(
+      buildPhotoFormData({
+        chatId: '1',
+        imageUrl: 'https://example.com/x.webp',
+        caption: 'c',
+        parseMode: 'HTML',
+      }),
+    ).rejects.toThrow(/ECONNREFUSED/);
+  });
+
+  it('throws when the image exceeds 10 MB (Telegram multipart limit)', async () => {
+    // 11 MB
+    const big = new Uint8Array(11 * 1024 * 1024);
+    mockFetch.mockResolvedValueOnce(makeImageResponse({ bytes: big }));
+
+    await expect(
+      buildPhotoFormData({
+        chatId: '1',
+        imageUrl: 'https://example.com/huge.webp',
+        caption: 'c',
+        parseMode: 'HTML',
+      }),
+    ).rejects.toThrow(/size|large|10/i);
+  });
+
+  it('rejects early when content-length header advertises > 10 MB (avoids download)', async () => {
+    mockFetch.mockResolvedValueOnce({
+      ok: true,
+      status: 200,
+      headers: {
+        get: (h) => {
+          const k = h.toLowerCase();
+          if (k === 'content-type') return 'image/jpeg';
+          if (k === 'content-length') return String(50 * 1024 * 1024);
+          return null;
+        },
+      },
+      arrayBuffer: async () => {
+        throw new Error('should not be called - size check should reject first');
+      },
+    });
+
+    await expect(
+      buildPhotoFormData({
+        chatId: '1',
+        imageUrl: 'https://example.com/huge.webp',
+        caption: 'c',
+        parseMode: 'HTML',
+      }),
+    ).rejects.toThrow(/size|large|10/i);
+  });
+
+  it('accepts exactly 10 MB images (boundary)', async () => {
+    const bytes = new Uint8Array(10 * 1024 * 1024);
+    mockFetch.mockResolvedValueOnce(makeImageResponse({ bytes }));
+
+    const fd = await buildPhotoFormData({
+      chatId: '1',
+      imageUrl: 'https://example.com/exact.webp',
+      caption: 'c',
+      parseMode: 'HTML',
+    });
+
+    expect(fd.get('photo').size).toBe(10 * 1024 * 1024);
+  });
+
+  it('coerces non-string chatId (number) to string in form data', async () => {
+    mockFetch.mockResolvedValueOnce(makeImageResponse());
+
+    const fd = await buildPhotoFormData({
+      chatId: 999,
+      imageUrl: 'https://example.com/x.webp',
+      caption: 'c',
+      parseMode: 'HTML',
+    });
+
+    expect(fd.get('chat_id')).toBe('999');
+  });
+});

test/services/immoscout/immoscout-web-translator.test.js

@@ -46,6 +46,60 @@ describe('#immoscout-mobile URL conversion', () => {
     expect(queryParams.get('equipment').split(',')).toEqual(expect.arrayContaining(['garden', 'balcony']));
   });
 
+  // Test URL conversion of SEO web path for max warmrent. The ImmoScout web UI
+  // generates this special SEO slug instead of explicit price/pricetype params
+  // when the user configures a "Warmmiete" filter (real-world URL).
+  it('should convert a SEO apartment max warmrent path to rent + price + pricetype', () => {
+    const webUrl =
+      'https://www.immobilienscout24.de/Suche/de/nordrhein-westfalen/duesseldorf/wohnung-bis-800-euro-warm?livingspace=-800.0&enteredFrom=result_list';
+
+    const converted = convertWebToMobile(webUrl);
+    const queryParams = new URL(converted).searchParams;
+    expect(queryParams.get('realestatetype')).toBe('apartmentrent');
+    expect(queryParams.get('price')).toBe('-800');
+    expect(queryParams.get('pricetype')).toBe('calculatedtotalrent');
+    expect(queryParams.get('geocodes')).toBe('/de/nordrhein-westfalen/duesseldorf');
+    expect(queryParams.get('livingspace')).toBe('-800.0');
+  });
+
+  // Same SEO pattern for houses ("haus-bis-X-euro-warm" → houserent).
+  it('should convert a SEO house max warmrent path to rent + price + pricetype', () => {
+    const webUrl = 'https://www.immobilienscout24.de/Suche/de/berlin/berlin/haus-bis-1500-euro-warm';
+
+    const converted = convertWebToMobile(webUrl);
+    const queryParams = new URL(converted).searchParams;
+    expect(queryParams.get('realestatetype')).toBe('houserent');
+    expect(queryParams.get('price')).toBe('-1500');
+    expect(queryParams.get('pricetype')).toBe('calculatedtotalrent');
+  });
+
+  // Sanity check: max coldrent ("Kaltmiete") does NOT use an SEO slug. The web
+  // UI keeps the regular "wohnung-mieten" path and passes explicit
+  // price + pricetype query params, which the existing translator already
+  // handles (real-world URL).
+  it('should convert a max coldrent search via the regular wohnung-mieten path', () => {
+    const webUrl =
+      'https://www.immobilienscout24.de/Suche/de/nordrhein-westfalen/duesseldorf/wohnung-mieten?price=-800.0&livingspace=-800.0&pricetype=rentpermonth&enteredFrom=result_list';
+
+    const converted = convertWebToMobile(webUrl);
+    const queryParams = new URL(converted).searchParams;
+    expect(queryParams.get('realestatetype')).toBe('apartmentrent');
+    expect(queryParams.get('price')).toBe('-800.0');
+    expect(queryParams.get('pricetype')).toBe('rentpermonth');
+    expect(queryParams.get('geocodes')).toBe('/de/nordrhein-westfalen/duesseldorf');
+  });
+
+  // Explicit query params win over the SEO slug's implicit defaults.
+  it('should let explicit query params override SEO path price defaults', () => {
+    const webUrl = 'https://www.immobilienscout24.de/Suche/de/berlin/berlin/wohnung-bis-800-euro-warm?price=100-500';
+
+    const converted = convertWebToMobile(webUrl);
+    const queryParams = new URL(converted).searchParams;
+    expect(queryParams.get('realestatetype')).toBe('apartmentrent');
+    expect(queryParams.get('price')).toBe('100-500');
+    expect(queryParams.get('pricetype')).toBe('calculatedtotalrent');
+  });
+
   // Test URL conversion with unsupported query parameters
   it('should remove unsupported query parameters', () => {
     const webUrl = 'https://www.immobilienscout24.de/Suche/de/berlin/berlin/wohnung-mieten?minimuminternetspeed=100000';