feat: port upstream OPDS improvements (PRs #1207, #1209)

Port two upstream PRs:

- PR #1207: Replace manual chunked download loop with
  HTTPClient::writeToStream via a FileWriteStream adapter, improving
  reliability for OPDS file downloads including chunked transfers.

- PR #1209: Add support for multiple OPDS servers with a new
  OpdsServerStore (JSON persistence with MAC-based password obfuscation),
  OpdsServerListActivity and OpdsSettingsActivity UIs, per-server
  credentials passed to HttpDownloader, web UI management endpoints,
  and migration from legacy single-server settings.

Made-with: Cursor

lib/I18n/I18nKeys.h

@@ -416,6 +416,12 @@ enum class StrId : uint16_t {
   STR_ACTION_FAILED,
   STR_BACK_TO_BEGINNING,
   STR_CLOSE_MENU,
+  STR_ADD_SERVER,
+  STR_SERVER_NAME,
+  STR_NO_SERVERS,
+  STR_DELETE_SERVER,
+  STR_DELETE_CONFIRM,
+  STR_OPDS_SERVERS,
   // Sentinel - must be last
   _COUNT
 };

lib/I18n/translations/czech.yaml

@@ -344,3 +344,9 @@ STR_INDEXING_STATUS_ICON: "Ikona stavového řádku"
 STR_SYNC_CLOCK: "Sync Clock"
 STR_TIME_SYNCED: "Time synced!"
 STR_AUTO_NTP_SYNC: "Auto Sync on Boot"
+STR_ADD_SERVER: "Přidat server"
+STR_SERVER_NAME: "Název serveru"
+STR_NO_SERVERS: "Žádné OPDS servery nejsou nakonfigurovány"
+STR_DELETE_SERVER: "Smazat server"
+STR_DELETE_CONFIRM: "Smazat tento server?"
+STR_OPDS_SERVERS: "OPDS servery"

lib/I18n/translations/english.yaml

@@ -380,3 +380,9 @@ STR_BOOK_REINDEXED: "Book reindexed"
 STR_ACTION_FAILED: "Action failed"
 STR_BACK_TO_BEGINNING: "Back to Beginning"
 STR_CLOSE_MENU: "Close Menu"
+STR_ADD_SERVER: "Add Server"
+STR_SERVER_NAME: "Server Name"
+STR_NO_SERVERS: "No OPDS servers configured"
+STR_DELETE_SERVER: "Delete Server"
+STR_DELETE_CONFIRM: "Delete this server?"
+STR_OPDS_SERVERS: "OPDS Servers"

lib/I18n/translations/french.yaml

@@ -344,3 +344,9 @@ STR_INDEXING_STATUS_ICON: "Icône barre d'état"
 STR_SYNC_CLOCK: "Sync Clock"
 STR_TIME_SYNCED: "Time synced!"
 STR_AUTO_NTP_SYNC: "Auto Sync on Boot"
+STR_ADD_SERVER: "Ajouter un serveur"
+STR_SERVER_NAME: "Nom du serveur"
+STR_NO_SERVERS: "Aucun serveur OPDS configuré"
+STR_DELETE_SERVER: "Supprimer le serveur"
+STR_DELETE_CONFIRM: "Supprimer ce serveur ?"
+STR_OPDS_SERVERS: "Serveurs OPDS"

lib/I18n/translations/german.yaml

@@ -344,3 +344,9 @@ STR_INDEXING_STATUS_ICON: "Statusleistensymbol"
 STR_SYNC_CLOCK: "Sync Clock"
 STR_TIME_SYNCED: "Time synced!"
 STR_AUTO_NTP_SYNC: "Auto Sync on Boot"
+STR_ADD_SERVER: "Server hinzufügen"
+STR_SERVER_NAME: "Servername"
+STR_NO_SERVERS: "Keine OPDS-Server konfiguriert"
+STR_DELETE_SERVER: "Server löschen"
+STR_DELETE_CONFIRM: "Diesen Server löschen?"
+STR_OPDS_SERVERS: "OPDS-Server"

lib/I18n/translations/portuguese.yaml

@@ -344,3 +344,9 @@ STR_INDEXING_STATUS_ICON: "Ícone da barra"
 STR_SYNC_CLOCK: "Sync Clock"
 STR_TIME_SYNCED: "Time synced!"
 STR_AUTO_NTP_SYNC: "Auto Sync on Boot"
+STR_ADD_SERVER: "Adicionar servidor"
+STR_SERVER_NAME: "Nome do servidor"
+STR_NO_SERVERS: "Nenhum servidor OPDS configurado"
+STR_DELETE_SERVER: "Excluir servidor"
+STR_DELETE_CONFIRM: "Excluir este servidor?"
+STR_OPDS_SERVERS: "Servidores OPDS"

lib/I18n/translations/romanian.yaml

@@ -319,3 +319,9 @@ STR_OPDS_SERVER_URL: "URL server OPDS"
 STR_SYNC_CLOCK: "Sync Clock"
 STR_TIME_SYNCED: "Time synced!"
 STR_AUTO_NTP_SYNC: "Auto Sync on Boot"
+STR_ADD_SERVER: "Adaugă server"
+STR_SERVER_NAME: "Numele serverului"
+STR_NO_SERVERS: "Niciun server OPDS configurat"
+STR_DELETE_SERVER: "Șterge serverul"
+STR_DELETE_CONFIRM: "Ștergi acest server?"
+STR_OPDS_SERVERS: "Servere OPDS"

lib/I18n/translations/russian.yaml

@@ -344,3 +344,9 @@ STR_INDEXING_STATUS_ICON: "Иконка в строке"
 STR_SYNC_CLOCK: "Sync Clock"
 STR_TIME_SYNCED: "Time synced!"
 STR_AUTO_NTP_SYNC: "Auto Sync on Boot"
+STR_ADD_SERVER: "Добавить сервер"
+STR_SERVER_NAME: "Имя сервера"
+STR_NO_SERVERS: "Нет настроенных серверов OPDS"
+STR_DELETE_SERVER: "Удалить сервер"
+STR_DELETE_CONFIRM: "Удалить этот сервер?"
+STR_OPDS_SERVERS: "Серверы OPDS"

lib/I18n/translations/spanish.yaml

@@ -344,3 +344,9 @@ STR_INDEXING_STATUS_ICON: "Icono barra estado"
 STR_SYNC_CLOCK: "Sync Clock"
 STR_TIME_SYNCED: "Time synced!"
 STR_AUTO_NTP_SYNC: "Auto Sync on Boot"
+STR_ADD_SERVER: "Añadir servidor"
+STR_SERVER_NAME: "Nombre del servidor"
+STR_NO_SERVERS: "No hay servidores OPDS configurados"
+STR_DELETE_SERVER: "Eliminar servidor"
+STR_DELETE_CONFIRM: "¿Eliminar este servidor?"
+STR_OPDS_SERVERS: "Servidores OPDS"

lib/I18n/translations/swedish.yaml

@@ -344,3 +344,9 @@ STR_INDEXING_STATUS_ICON: "Statusfältsikon"
 STR_SYNC_CLOCK: "Sync Clock"
 STR_TIME_SYNCED: "Time synced!"
 STR_AUTO_NTP_SYNC: "Auto Sync on Boot"
+STR_ADD_SERVER: "Lägg till server"
+STR_SERVER_NAME: "Servernamn"
+STR_NO_SERVERS: "Inga OPDS-servrar konfigurerade"
+STR_DELETE_SERVER: "Ta bort server"
+STR_DELETE_CONFIRM: "Ta bort denna server?"
+STR_OPDS_SERVERS: "OPDS-servrar"

src/OpdsServerStore.cpp

@@ -0,0 +1,201 @@
+#include "OpdsServerStore.h"
+
+#include <ArduinoJson.h>
+#include <HalStorage.h>
+#include <Logging.h>
+#include <base64.h>
+#include <esp_mac.h>
+#include <mbedtls/base64.h>
+
+#include <cstring>
+
+#include "CrossPointSettings.h"
+
+OpdsServerStore OpdsServerStore::instance;
+
+namespace {
+constexpr char OPDS_FILE_JSON[] = "/.crosspoint/opds.json";
+constexpr size_t HW_KEY_LEN = 6;
+
+const uint8_t* getHwKey() {
+  static uint8_t key[HW_KEY_LEN] = {};
+  static bool initialized = false;
+  if (!initialized) {
+    esp_efuse_mac_get_default(key);
+    initialized = true;
+  }
+  return key;
+}
+
+void xorTransform(std::string& data) {
+  const uint8_t* key = getHwKey();
+  for (size_t i = 0; i < data.size(); i++) {
+    data[i] ^= key[i % HW_KEY_LEN];
+  }
+}
+
+String obfuscateToBase64(const std::string& plaintext) {
+  if (plaintext.empty()) return "";
+  std::string temp = plaintext;
+  xorTransform(temp);
+  return base64::encode(reinterpret_cast<const uint8_t*>(temp.data()), temp.size());
+}
+
+std::string deobfuscateFromBase64(const char* encoded, bool* ok) {
+  if (encoded == nullptr || encoded[0] == '\0') {
+    if (ok) *ok = false;
+    return "";
+  }
+  if (ok) *ok = true;
+  size_t encodedLen = strlen(encoded);
+  size_t decodedLen = 0;
+  int ret = mbedtls_base64_decode(nullptr, 0, &decodedLen, reinterpret_cast<const unsigned char*>(encoded), encodedLen);
+  if (ret != 0 && ret != MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL) {
+    LOG_ERR("OPS", "Base64 decode size query failed (ret=%d)", ret);
+    if (ok) *ok = false;
+    return "";
+  }
+  std::string result(decodedLen, '\0');
+  ret = mbedtls_base64_decode(reinterpret_cast<unsigned char*>(&result[0]), decodedLen, &decodedLen,
+                              reinterpret_cast<const unsigned char*>(encoded), encodedLen);
+  if (ret != 0) {
+    LOG_ERR("OPS", "Base64 decode failed (ret=%d)", ret);
+    if (ok) *ok = false;
+    return "";
+  }
+  result.resize(decodedLen);
+  xorTransform(result);
+  return result;
+}
+}  // namespace
+
+bool OpdsServerStore::saveToFile() const {
+  Storage.mkdir("/.crosspoint");
+
+  JsonDocument doc;
+  JsonArray arr = doc["servers"].to<JsonArray>();
+  for (const auto& server : servers) {
+    JsonObject obj = arr.add<JsonObject>();
+    obj["name"] = server.name;
+    obj["url"] = server.url;
+    obj["username"] = server.username;
+    obj["password_obf"] = obfuscateToBase64(server.password);
+  }
+
+  String json;
+  serializeJson(doc, json);
+  return Storage.writeFile(OPDS_FILE_JSON, json);
+}
+
+bool OpdsServerStore::loadFromFile() {
+  if (Storage.exists(OPDS_FILE_JSON)) {
+    String json = Storage.readFile(OPDS_FILE_JSON);
+    if (!json.isEmpty()) {
+      JsonDocument doc;
+      auto error = deserializeJson(doc, json.c_str());
+      if (error) {
+        LOG_ERR("OPS", "JSON parse error: %s", error.c_str());
+        return false;
+      }
+
+      servers.clear();
+      bool needsResave = false;
+      JsonArray arr = doc["servers"].as<JsonArray>();
+      for (JsonObject obj : arr) {
+        if (servers.size() >= MAX_SERVERS) break;
+        OpdsServer server;
+        server.name = obj["name"] | std::string("");
+        server.url = obj["url"] | std::string("");
+        server.username = obj["username"] | std::string("");
+
+        bool ok = false;
+        server.password = deobfuscateFromBase64(obj["password_obf"] | "", &ok);
+        if (!ok || server.password.empty()) {
+          server.password = obj["password"] | std::string("");
+          if (!server.password.empty()) needsResave = true;
+        }
+        servers.push_back(std::move(server));
+      }
+
+      LOG_DBG("OPS", "Loaded %zu OPDS servers from file", servers.size());
+
+      if (needsResave) {
+        LOG_DBG("OPS", "Resaving JSON with obfuscated passwords");
+        saveToFile();
+      }
+      return true;
+    }
+  }
+
+  // No opds.json found — attempt one-time migration from the legacy single-server
+  // fields in CrossPointSettings (opdsServerUrl/opdsUsername/opdsPassword).
+  if (migrateFromSettings()) {
+    LOG_DBG("OPS", "Migrated legacy OPDS settings");
+    return true;
+  }
+
+  return false;
+}
+
+bool OpdsServerStore::migrateFromSettings() {
+  if (strlen(SETTINGS.opdsServerUrl) == 0) {
+    return false;
+  }
+
+  OpdsServer server;
+  server.name = "OPDS Server";
+  server.url = SETTINGS.opdsServerUrl;
+  server.username = SETTINGS.opdsUsername;
+  server.password = SETTINGS.opdsPassword;
+  servers.push_back(std::move(server));
+
+  if (saveToFile()) {
+    SETTINGS.opdsServerUrl[0] = '\0';
+    SETTINGS.opdsUsername[0] = '\0';
+    SETTINGS.opdsPassword[0] = '\0';
+    SETTINGS.saveToFile();
+    LOG_DBG("OPS", "Migrated single-server OPDS config to opds.json");
+    return true;
+  }
+
+  servers.clear();
+  return false;
+}
+
+bool OpdsServerStore::addServer(const OpdsServer& server) {
+  if (servers.size() >= MAX_SERVERS) {
+    LOG_DBG("OPS", "Cannot add more servers, limit of %zu reached", MAX_SERVERS);
+    return false;
+  }
+
+  servers.push_back(server);
+  LOG_DBG("OPS", "Added server: %s", server.name.c_str());
+  return saveToFile();
+}
+
+bool OpdsServerStore::updateServer(size_t index, const OpdsServer& server) {
+  if (index >= servers.size()) {
+    return false;
+  }
+
+  servers[index] = server;
+  LOG_DBG("OPS", "Updated server: %s", server.name.c_str());
+  return saveToFile();
+}
+
+bool OpdsServerStore::removeServer(size_t index) {
+  if (index >= servers.size()) {
+    return false;
+  }
+
+  LOG_DBG("OPS", "Removed server: %s", servers[index].name.c_str());
+  servers.erase(servers.begin() + static_cast<ptrdiff_t>(index));
+  return saveToFile();
+}
+
+const OpdsServer* OpdsServerStore::getServer(size_t index) const {
+  if (index >= servers.size()) {
+    return nullptr;
+  }
+  return &servers[index];
+}

src/OpdsServerStore.h

@@ -0,0 +1,51 @@
+#pragma once
+#include <string>
+#include <vector>
+
+struct OpdsServer {
+  std::string name;
+  std::string url;
+  std::string username;
+  std::string password;  // Plaintext in memory; obfuscated with hardware key on disk
+};
+
+/**
+ * Singleton class for storing OPDS server configurations on the SD card.
+ * Passwords are XOR-obfuscated with the device's unique hardware MAC address
+ * and base64-encoded before writing to JSON.
+ */
+class OpdsServerStore {
+ private:
+  static OpdsServerStore instance;
+  std::vector<OpdsServer> servers;
+
+  static constexpr size_t MAX_SERVERS = 8;
+
+  OpdsServerStore() = default;
+
+ public:
+  OpdsServerStore(const OpdsServerStore&) = delete;
+  OpdsServerStore& operator=(const OpdsServerStore&) = delete;
+
+  static OpdsServerStore& getInstance() { return instance; }
+
+  bool saveToFile() const;
+  bool loadFromFile();
+
+  bool addServer(const OpdsServer& server);
+  bool updateServer(size_t index, const OpdsServer& server);
+  bool removeServer(size_t index);
+
+  const std::vector<OpdsServer>& getServers() const { return servers; }
+  const OpdsServer* getServer(size_t index) const;
+  size_t getCount() const { return servers.size(); }
+  bool hasServers() const { return !servers.empty(); }
+
+  /**
+   * Migrate from legacy single-server settings in CrossPointSettings.
+   * Called once during first load if no opds.json exists.
+   */
+  bool migrateFromSettings();
+};
+
+#define OPDS_STORE OpdsServerStore::getInstance()

src/SettingsList.h

@@ -191,13 +191,5 @@ inline std::vector<SettingInfo> getSettingsList() {
             KOREADER_STORE.saveToFile();
           },
           "koMatchMethod", StrId::STR_KOREADER_SYNC),
-
-      // --- OPDS Browser (web-only, uses CrossPointSettings char arrays) ---
-      SettingInfo::String(StrId::STR_OPDS_SERVER_URL, SETTINGS.opdsServerUrl, sizeof(SETTINGS.opdsServerUrl),
-                          "opdsServerUrl", StrId::STR_OPDS_BROWSER),
-      SettingInfo::String(StrId::STR_USERNAME, SETTINGS.opdsUsername, sizeof(SETTINGS.opdsUsername), "opdsUsername",
-                          StrId::STR_OPDS_BROWSER),
-      SettingInfo::String(StrId::STR_PASSWORD, SETTINGS.opdsPassword, sizeof(SETTINGS.opdsPassword), "opdsPassword",
-                          StrId::STR_OPDS_BROWSER),
   };
 }

src/activities/browser/OpdsBookBrowserActivity.cpp

@@ -7,7 +7,6 @@
 #include <OpdsStream.h>
 #include <WiFi.h>
 
-#include "CrossPointSettings.h"
 #include "MappedInputManager.h"
 #include "activities/network/WifiSelectionActivity.h"
 #include "components/UITheme.h"
@@ -142,7 +141,8 @@ void OpdsBookBrowserActivity::render(Activity::RenderLock&&) {
   const auto pageWidth = renderer.getScreenWidth();
   const auto pageHeight = renderer.getScreenHeight();
 
-  renderer.drawCenteredText(UI_12_FONT_ID, 15, tr(STR_OPDS_BROWSER), true, EpdFontFamily::BOLD);
+  const char* headerTitle = server.name.empty() ? tr(STR_OPDS_BROWSER) : server.name.c_str();
+  renderer.drawCenteredText(UI_12_FONT_ID, 15, headerTitle, true, EpdFontFamily::BOLD);
 
   if (state == BrowserState::CHECK_WIFI) {
     renderer.drawCenteredText(UI_10_FONT_ID, pageHeight / 2, statusMessage.c_str());
@@ -171,7 +171,9 @@ void OpdsBookBrowserActivity::render(Activity::RenderLock&&) {
 
   if (state == BrowserState::DOWNLOADING) {
     renderer.drawCenteredText(UI_10_FONT_ID, pageHeight / 2 - 40, tr(STR_DOWNLOADING));
-    renderer.drawCenteredText(UI_10_FONT_ID, pageHeight / 2 - 10, statusMessage.c_str());
+    const auto maxWidth = pageWidth - 40;
+    auto title = renderer.truncatedText(UI_10_FONT_ID, statusMessage.c_str(), maxWidth);
+    renderer.drawCenteredText(UI_10_FONT_ID, pageHeight / 2 - 10, title.c_str());
     if (downloadTotal > 0) {
       const int barWidth = pageWidth - 100;
       constexpr int barHeight = 20;
@@ -225,22 +227,21 @@ void OpdsBookBrowserActivity::render(Activity::RenderLock&&) {
 }
 
 void OpdsBookBrowserActivity::fetchFeed(const std::string& path) {
-  const char* serverUrl = SETTINGS.opdsServerUrl;
+  if (server.url.empty()) {
-  if (strlen(serverUrl) == 0) {
     state = BrowserState::ERROR;
     errorMessage = tr(STR_NO_SERVER_URL);
     requestUpdate();
     return;
   }
 
-  std::string url = UrlUtils::buildUrl(serverUrl, path);
+  std::string url = UrlUtils::buildUrl(server.url, path);
   LOG_DBG("OPDS", "Fetching: %s", url.c_str());
 
   OpdsParser parser;
 
   {
     OpdsParserStream stream{parser};
-    if (!HttpDownloader::fetchUrl(url, stream)) {
+    if (!HttpDownloader::fetchUrl(url, stream, server.username, server.password)) {
       state = BrowserState::ERROR;
       errorMessage = tr(STR_FETCH_FEED_FAILED);
       requestUpdate();
@@ -311,7 +312,7 @@ void OpdsBookBrowserActivity::downloadBook(const OpdsEntry& book) {
   requestUpdate();
 
   // Build full download URL
-  std::string downloadUrl = UrlUtils::buildUrl(SETTINGS.opdsServerUrl, book.href);
+  std::string downloadUrl = UrlUtils::buildUrl(server.url, book.href);
 
   // Create sanitized filename: "Title - Author.epub" or just "Title.epub" if no author
   std::string baseName = book.title;
@@ -322,12 +323,14 @@ void OpdsBookBrowserActivity::downloadBook(const OpdsEntry& book) {
 
   LOG_DBG("OPDS", "Downloading: %s -> %s", downloadUrl.c_str(), filename.c_str());
 
-  const auto result =
+  const auto result = HttpDownloader::downloadToFile(
-      HttpDownloader::downloadToFile(downloadUrl, filename, [this](const size_t downloaded, const size_t total) {
+      downloadUrl, filename,
+      [this](const size_t downloaded, const size_t total) {
         downloadProgress = downloaded;
         downloadTotal = total;
         requestUpdate();
-      });
+      },
+      server.username, server.password);
 
   if (result == HttpDownloader::OK) {
     LOG_DBG("OPDS", "Download complete: %s", filename.c_str());

src/activities/browser/OpdsBookBrowserActivity.h

@@ -6,6 +6,7 @@
 #include <vector>
 
 #include "../ActivityWithSubactivity.h"
+#include "OpdsServerStore.h"
 #include "util/ButtonNavigator.h"
 
 /**
@@ -25,8 +26,8 @@ class OpdsBookBrowserActivity final : public ActivityWithSubactivity {
   };
 
   explicit OpdsBookBrowserActivity(GfxRenderer& renderer, MappedInputManager& mappedInput,
-                                   const std::function<void()>& onGoHome)
+                                   const std::function<void()>& onGoHome, const OpdsServer& server)
-      : ActivityWithSubactivity("OpdsBookBrowser", renderer, mappedInput), onGoHome(onGoHome) {}
+      : ActivityWithSubactivity("OpdsBookBrowser", renderer, mappedInput), onGoHome(onGoHome), server(server) {}
 
   void onEnter() override;
   void onExit() override;
@@ -46,6 +47,7 @@ class OpdsBookBrowserActivity final : public ActivityWithSubactivity {
   size_t downloadTotal = 0;
 
   const std::function<void()> onGoHome;
+  OpdsServer server;  // Copied at construction — safe even if the store changes during browsing
 
   void checkAndConnectWifi();
   void launchWifiSelection();

src/activities/home/HomeActivity.cpp

@@ -17,6 +17,7 @@
 #include "CrossPointSettings.h"
 #include "CrossPointState.h"
 #include "MappedInputManager.h"
+#include "OpdsServerStore.h"
 #include "RecentBooksStore.h"
 #include "components/UITheme.h"
 #include "fontIds.h"
@@ -28,7 +29,7 @@ int HomeActivity::getMenuItemCount() const {
   if (!recentBooks.empty()) {
     count += recentBooks.size();
   }
-  if (hasOpdsUrl) {
+  if (hasOpdsServers) {
     count++;
   }
   return count;
@@ -128,8 +129,7 @@ void HomeActivity::loadRecentCovers(int coverHeight) {
 void HomeActivity::onEnter() {
   ActivityWithSubactivity::onEnter();
 
-  // Check if OPDS browser URL is configured
+  hasOpdsServers = OPDS_STORE.hasServers();
-  hasOpdsUrl = strlen(SETTINGS.opdsServerUrl) > 0;
 
   selectorIndex = 0;
 
@@ -238,7 +238,7 @@ void HomeActivity::loop() {
     int menuSelectedIndex = selectorIndex - static_cast<int>(recentBooks.size());
     const int myLibraryIdx = idx++;
     const int recentsIdx = idx++;
-    const int opdsLibraryIdx = hasOpdsUrl ? idx++ : -1;
+    const int opdsLibraryIdx = hasOpdsServers ? idx++ : -1;
     const int fileTransferIdx = idx++;
     const int settingsIdx = idx;
 
@@ -277,7 +277,7 @@ void HomeActivity::render(Activity::RenderLock&&) {
                                         tr(STR_SETTINGS_TITLE)};
   std::vector<UIIcon> menuIcons = {Folder, Recent, Transfer, Settings};
 
-  if (hasOpdsUrl) {
+  if (hasOpdsServers) {
     // Insert OPDS Browser after My Library
     menuItems.insert(menuItems.begin() + 2, tr(STR_OPDS_BROWSER));
     menuIcons.insert(menuIcons.begin() + 2, Library);

src/activities/home/HomeActivity.h

@@ -15,7 +15,7 @@ class HomeActivity final : public ActivityWithSubactivity {
   bool recentsLoading = false;
   bool recentsLoaded = false;
   bool firstRenderDone = false;
-  bool hasOpdsUrl = false;
+  bool hasOpdsServers = false;
   bool coverRendered = false;      // Track if cover has been rendered once
   bool coverBufferStored = false;  // Track if cover buffer is stored
   uint8_t* coverBuffer = nullptr;  // HomeActivity's own buffer for cover image

src/activities/settings/CalibreSettingsActivity.cpp

@@ -1,149 +0,0 @@
-#include "CalibreSettingsActivity.h"
-
-#include <GfxRenderer.h>
-#include <I18n.h>
-
-#include <cstring>
-
-#include "CrossPointSettings.h"
-#include "MappedInputManager.h"
-#include "activities/util/KeyboardEntryActivity.h"
-#include "components/UITheme.h"
-#include "fontIds.h"
-
-namespace {
-constexpr int MENU_ITEMS = 3;
-const StrId menuNames[MENU_ITEMS] = {StrId::STR_CALIBRE_WEB_URL, StrId::STR_USERNAME, StrId::STR_PASSWORD};
-}  // namespace
-
-void CalibreSettingsActivity::onEnter() {
-  ActivityWithSubactivity::onEnter();
-
-  selectedIndex = 0;
-  requestUpdate();
-}
-
-void CalibreSettingsActivity::onExit() { ActivityWithSubactivity::onExit(); }
-
-void CalibreSettingsActivity::loop() {
-  if (subActivity) {
-    subActivity->loop();
-    return;
-  }
-
-  if (mappedInput.wasPressed(MappedInputManager::Button::Back)) {
-    onBack();
-    return;
-  }
-
-  if (mappedInput.wasPressed(MappedInputManager::Button::Confirm)) {
-    handleSelection();
-    return;
-  }
-
-  // Handle navigation
-  buttonNavigator.onNext([this] {
-    selectedIndex = (selectedIndex + 1) % MENU_ITEMS;
-    requestUpdate();
-  });
-
-  buttonNavigator.onPrevious([this] {
-    selectedIndex = (selectedIndex + MENU_ITEMS - 1) % MENU_ITEMS;
-    requestUpdate();
-  });
-}
-
-void CalibreSettingsActivity::handleSelection() {
-  if (selectedIndex == 0) {
-    // OPDS Server URL
-    exitActivity();
-    enterNewActivity(new KeyboardEntryActivity(
-        renderer, mappedInput, tr(STR_CALIBRE_WEB_URL), SETTINGS.opdsServerUrl,
-        127,    // maxLength
-        false,  // not password
-        [this](const std::string& url) {
-          strncpy(SETTINGS.opdsServerUrl, url.c_str(), sizeof(SETTINGS.opdsServerUrl) - 1);
-          SETTINGS.opdsServerUrl[sizeof(SETTINGS.opdsServerUrl) - 1] = '\0';
-          SETTINGS.saveToFile();
-          exitActivity();
-          requestUpdate();
-        },
-        [this]() {
-          exitActivity();
-          requestUpdate();
-        }));
-  } else if (selectedIndex == 1) {
-    // Username
-    exitActivity();
-    enterNewActivity(new KeyboardEntryActivity(
-        renderer, mappedInput, tr(STR_USERNAME), SETTINGS.opdsUsername,
-        63,     // maxLength
-        false,  // not password
-        [this](const std::string& username) {
-          strncpy(SETTINGS.opdsUsername, username.c_str(), sizeof(SETTINGS.opdsUsername) - 1);
-          SETTINGS.opdsUsername[sizeof(SETTINGS.opdsUsername) - 1] = '\0';
-          SETTINGS.saveToFile();
-          exitActivity();
-          requestUpdate();
-        },
-        [this]() {
-          exitActivity();
-          requestUpdate();
-        }));
-  } else if (selectedIndex == 2) {
-    // Password
-    exitActivity();
-    enterNewActivity(new KeyboardEntryActivity(
-        renderer, mappedInput, tr(STR_PASSWORD), SETTINGS.opdsPassword,
-        63,     // maxLength
-        false,  // not password mode
-        [this](const std::string& password) {
-          strncpy(SETTINGS.opdsPassword, password.c_str(), sizeof(SETTINGS.opdsPassword) - 1);
-          SETTINGS.opdsPassword[sizeof(SETTINGS.opdsPassword) - 1] = '\0';
-          SETTINGS.saveToFile();
-          exitActivity();
-          requestUpdate();
-        },
-        [this]() {
-          exitActivity();
-          requestUpdate();
-        }));
-  }
-}
-
-void CalibreSettingsActivity::render(Activity::RenderLock&&) {
-  renderer.clearScreen();
-
-  auto metrics = UITheme::getInstance().getMetrics();
-  const auto pageWidth = renderer.getScreenWidth();
-  const auto pageHeight = renderer.getScreenHeight();
-  GUI.drawHeader(renderer, Rect{0, metrics.topPadding, pageWidth, metrics.headerHeight}, tr(STR_OPDS_BROWSER));
-  GUI.drawSubHeader(renderer, Rect{0, metrics.topPadding + metrics.headerHeight, pageWidth, metrics.tabBarHeight},
-                    tr(STR_CALIBRE_URL_HINT));
-
-  const int contentTop = metrics.topPadding + metrics.headerHeight + metrics.verticalSpacing + metrics.tabBarHeight;
-  const int contentHeight = pageHeight - contentTop - metrics.buttonHintsHeight - metrics.verticalSpacing * 2;
-  GUI.drawList(
-      renderer, Rect{0, contentTop, pageWidth, contentHeight}, static_cast<int>(MENU_ITEMS),
-      static_cast<int>(selectedIndex), [](int index) { return std::string(I18N.get(menuNames[index])); }, nullptr,
-      nullptr,
-      [this](int index) {
-        // Draw status for each setting
-        if (index == 0) {
-          return (strlen(SETTINGS.opdsServerUrl) > 0) ? std::string(SETTINGS.opdsServerUrl)
-                                                      : std::string(tr(STR_NOT_SET));
-        } else if (index == 1) {
-          return (strlen(SETTINGS.opdsUsername) > 0) ? std::string(SETTINGS.opdsUsername)
-                                                     : std::string(tr(STR_NOT_SET));
-        } else if (index == 2) {
-          return (strlen(SETTINGS.opdsPassword) > 0) ? std::string("******") : std::string(tr(STR_NOT_SET));
-        }
-        return std::string(tr(STR_NOT_SET));
-      },
-      true);
-
-  const auto labels = mappedInput.mapLabels(tr(STR_BACK), tr(STR_SELECT), tr(STR_DIR_UP), tr(STR_DIR_DOWN));
-  GUI.drawButtonHints(renderer, labels.btn1, labels.btn2, labels.btn3, labels.btn4);
-
-  renderer.displayBuffer();
-}

src/activities/settings/CalibreSettingsActivity.h

@@ -1,29 +0,0 @@
-#pragma once
-
-#include <functional>
-
-#include "activities/ActivityWithSubactivity.h"
-#include "util/ButtonNavigator.h"
-
-/**
- * Submenu for OPDS Browser settings.
- * Shows OPDS Server URL and HTTP authentication options.
- */
-class CalibreSettingsActivity final : public ActivityWithSubactivity {
- public:
-  explicit CalibreSettingsActivity(GfxRenderer& renderer, MappedInputManager& mappedInput,
-                                   const std::function<void()>& onBack)
-      : ActivityWithSubactivity("CalibreSettings", renderer, mappedInput), onBack(onBack) {}
-
-  void onEnter() override;
-  void onExit() override;
-  void loop() override;
-  void render(Activity::RenderLock&&) override;
-
- private:
-  ButtonNavigator buttonNavigator;
-
-  size_t selectedIndex = 0;
-  const std::function<void()> onBack;
-  void handleSelection();
-};

src/activities/settings/OpdsServerListActivity.cpp

@@ -0,0 +1,131 @@
+#include "OpdsServerListActivity.h"
+
+#include <GfxRenderer.h>
+#include <I18n.h>
+
+#include "MappedInputManager.h"
+#include "OpdsServerStore.h"
+#include "OpdsSettingsActivity.h"
+#include "components/UITheme.h"
+#include "fontIds.h"
+
+int OpdsServerListActivity::getItemCount() const {
+  int count = static_cast<int>(OPDS_STORE.getCount());
+  // In settings mode, append a virtual "Add Server" item; in picker mode, only show real servers
+  if (!isPickerMode()) {
+    count++;
+  }
+  return count;
+}
+
+void OpdsServerListActivity::onEnter() {
+  ActivityWithSubactivity::onEnter();
+
+  // Reload from disk in case servers were added/removed by a subactivity or the web UI
+  OPDS_STORE.loadFromFile();
+  selectedIndex = 0;
+  requestUpdate();
+}
+
+void OpdsServerListActivity::onExit() { ActivityWithSubactivity::onExit(); }
+
+void OpdsServerListActivity::loop() {
+  if (subActivity) {
+    subActivity->loop();
+    return;
+  }
+
+  if (mappedInput.wasPressed(MappedInputManager::Button::Back)) {
+    onBack();
+    return;
+  }
+
+  if (mappedInput.wasPressed(MappedInputManager::Button::Confirm)) {
+    handleSelection();
+    return;
+  }
+
+  const int itemCount = getItemCount();
+  if (itemCount > 0) {
+    buttonNavigator.onNext([this, itemCount] {
+      selectedIndex = ButtonNavigator::nextIndex(selectedIndex, itemCount);
+      requestUpdate();
+    });
+
+    buttonNavigator.onPrevious([this, itemCount] {
+      selectedIndex = ButtonNavigator::previousIndex(selectedIndex, itemCount);
+      requestUpdate();
+    });
+  }
+}
+
+void OpdsServerListActivity::handleSelection() {
+  const auto serverCount = static_cast<int>(OPDS_STORE.getCount());
+
+  if (isPickerMode()) {
+    // Picker mode: selecting a server triggers the callback instead of opening the editor
+    if (selectedIndex < serverCount) {
+      onServerSelected(static_cast<size_t>(selectedIndex));
+    }
+    return;
+  }
+
+  // Settings mode: open editor for selected server, or create a new one
+  auto onEditDone = [this] {
+    exitActivity();
+    selectedIndex = 0;
+    requestUpdate();
+  };
+
+  if (selectedIndex < serverCount) {
+    exitActivity();
+    enterNewActivity(new OpdsSettingsActivity(renderer, mappedInput, onEditDone, selectedIndex));
+  } else {
+    exitActivity();
+    enterNewActivity(new OpdsSettingsActivity(renderer, mappedInput, onEditDone, -1));
+  }
+}
+
+void OpdsServerListActivity::render(Activity::RenderLock&&) {
+  renderer.clearScreen();
+
+  const auto& metrics = UITheme::getInstance().getMetrics();
+  const auto pageWidth = renderer.getScreenWidth();
+  const auto pageHeight = renderer.getScreenHeight();
+
+  GUI.drawHeader(renderer, Rect{0, metrics.topPadding, pageWidth, metrics.headerHeight}, tr(STR_OPDS_SERVERS));
+
+  const int contentTop = metrics.topPadding + metrics.headerHeight + metrics.verticalSpacing;
+  const int contentHeight = pageHeight - contentTop - metrics.buttonHintsHeight - metrics.verticalSpacing * 2;
+  const int itemCount = getItemCount();
+
+  if (itemCount == 0) {
+    renderer.drawCenteredText(UI_10_FONT_ID, pageHeight / 2, tr(STR_NO_SERVERS));
+  } else {
+    const auto& servers = OPDS_STORE.getServers();
+    const auto serverCount = static_cast<int>(servers.size());
+
+    // Primary label: server name (falling back to URL if unnamed).
+    // Secondary label: server URL (shown as subtitle when name is set).
+    GUI.drawList(
+        renderer, Rect{0, contentTop, pageWidth, contentHeight}, itemCount, selectedIndex,
+        [&servers, serverCount](int index) {
+          if (index < serverCount) {
+            const auto& server = servers[index];
+            return server.name.empty() ? server.url : server.name;
+          }
+          return std::string(I18n::getInstance().get(StrId::STR_ADD_SERVER));
+        },
+        [&servers, serverCount](int index) {
+          if (index < serverCount && !servers[index].name.empty()) {
+            return servers[index].url;
+          }
+          return std::string("");
+        });
+  }
+
+  const auto labels = mappedInput.mapLabels(tr(STR_BACK), tr(STR_SELECT), tr(STR_DIR_UP), tr(STR_DIR_DOWN));
+  GUI.drawButtonHints(renderer, labels.btn1, labels.btn2, labels.btn3, labels.btn4);
+
+  renderer.displayBuffer();
+}

src/activities/settings/OpdsServerListActivity.h

@@ -0,0 +1,41 @@
+#pragma once
+
+#include <functional>
+
+#include "activities/ActivityWithSubactivity.h"
+#include "util/ButtonNavigator.h"
+
+/**
+ * Activity showing the list of configured OPDS servers.
+ * Allows adding new servers and editing/deleting existing ones.
+ * Used from Settings and also as a server picker from the home screen.
+ */
+class OpdsServerListActivity final : public ActivityWithSubactivity {
+ public:
+  using OnServerSelected = std::function<void(size_t serverIndex)>;
+
+  /**
+   * @param onBack Called when user presses Back
+   * @param onServerSelected If set, acts as a picker: selecting a server calls this instead of opening editor.
+   */
+  explicit OpdsServerListActivity(GfxRenderer& renderer, MappedInputManager& mappedInput,
+                                  const std::function<void()>& onBack, OnServerSelected onServerSelected = nullptr)
+      : ActivityWithSubactivity("OpdsServerList", renderer, mappedInput),
+        onBack(onBack),
+        onServerSelected(std::move(onServerSelected)) {}
+
+  void onEnter() override;
+  void onExit() override;
+  void loop() override;
+  void render(Activity::RenderLock&&) override;
+
+ private:
+  ButtonNavigator buttonNavigator;
+  int selectedIndex = 0;
+  const std::function<void()> onBack;
+  OnServerSelected onServerSelected;
+
+  bool isPickerMode() const { return onServerSelected != nullptr; }
+  int getItemCount() const;
+  void handleSelection();
+};

src/activities/settings/OpdsSettingsActivity.cpp

@@ -0,0 +1,199 @@
+#include "OpdsSettingsActivity.h"
+
+#include <GfxRenderer.h>
+#include <I18n.h>
+
+#include <cstring>
+
+#include "MappedInputManager.h"
+#include "OpdsServerStore.h"
+#include "activities/util/KeyboardEntryActivity.h"
+#include "components/UITheme.h"
+#include "fontIds.h"
+
+namespace {
+// Editable fields: Name, URL, Username, Password.
+// Existing servers also show a Delete option (BASE_ITEMS + 1).
+constexpr int BASE_ITEMS = 4;
+}  // namespace
+
+int OpdsSettingsActivity::getMenuItemCount() const {
+  return isNewServer ? BASE_ITEMS : BASE_ITEMS + 1;  // +1 for Delete
+}
+
+void OpdsSettingsActivity::onEnter() {
+  ActivityWithSubactivity::onEnter();
+
+  selectedIndex = 0;
+  isNewServer = (serverIndex < 0);
+
+  if (!isNewServer) {
+    const auto* server = OPDS_STORE.getServer(static_cast<size_t>(serverIndex));
+    if (server) {
+      editServer = *server;
+    } else {
+      // Server was deleted between navigation and entering this screen — treat as new
+      isNewServer = true;
+      serverIndex = -1;
+    }
+  }
+
+  requestUpdate();
+}
+
+void OpdsSettingsActivity::onExit() { ActivityWithSubactivity::onExit(); }
+
+void OpdsSettingsActivity::loop() {
+  if (subActivity) {
+    subActivity->loop();
+    return;
+  }
+
+  if (mappedInput.wasPressed(MappedInputManager::Button::Back)) {
+    onBack();
+    return;
+  }
+
+  if (mappedInput.wasPressed(MappedInputManager::Button::Confirm)) {
+    handleSelection();
+    return;
+  }
+
+  const int menuItems = getMenuItemCount();
+  buttonNavigator.onNext([this, menuItems] {
+    selectedIndex = (selectedIndex + 1) % menuItems;
+    requestUpdate();
+  });
+
+  buttonNavigator.onPrevious([this, menuItems] {
+    selectedIndex = (selectedIndex + menuItems - 1) % menuItems;
+    requestUpdate();
+  });
+}
+
+void OpdsSettingsActivity::saveServer() {
+  if (isNewServer) {
+    OPDS_STORE.addServer(editServer);
+    // After the first field is saved, promote to an existing server so
+    // subsequent field edits update in-place rather than creating duplicates.
+    isNewServer = false;
+    serverIndex = static_cast<int>(OPDS_STORE.getCount()) - 1;
+  } else {
+    OPDS_STORE.updateServer(static_cast<size_t>(serverIndex), editServer);
+  }
+}
+
+void OpdsSettingsActivity::handleSelection() {
+  if (selectedIndex == 0) {
+    // Server Name
+    exitActivity();
+    enterNewActivity(new KeyboardEntryActivity(
+        renderer, mappedInput, tr(STR_SERVER_NAME), editServer.name, 63, false,
+        [this](const std::string& name) {
+          editServer.name = name;
+          saveServer();
+          exitActivity();
+          requestUpdate();
+        },
+        [this]() {
+          exitActivity();
+          requestUpdate();
+        }));
+  } else if (selectedIndex == 1) {
+    // Server URL
+    exitActivity();
+    enterNewActivity(new KeyboardEntryActivity(
+        renderer, mappedInput, tr(STR_OPDS_SERVER_URL), editServer.url, 127, false,
+        [this](const std::string& url) {
+          editServer.url = url;
+          saveServer();
+          exitActivity();
+          requestUpdate();
+        },
+        [this]() {
+          exitActivity();
+          requestUpdate();
+        }));
+  } else if (selectedIndex == 2) {
+    // Username
+    exitActivity();
+    enterNewActivity(new KeyboardEntryActivity(
+        renderer, mappedInput, tr(STR_USERNAME), editServer.username, 63, false,
+        [this](const std::string& username) {
+          editServer.username = username;
+          saveServer();
+          exitActivity();
+          requestUpdate();
+        },
+        [this]() {
+          exitActivity();
+          requestUpdate();
+        }));
+  } else if (selectedIndex == 3) {
+    // Password
+    exitActivity();
+    enterNewActivity(new KeyboardEntryActivity(
+        renderer, mappedInput, tr(STR_PASSWORD), editServer.password, 63, false,
+        [this](const std::string& password) {
+          editServer.password = password;
+          saveServer();
+          exitActivity();
+          requestUpdate();
+        },
+        [this]() {
+          exitActivity();
+          requestUpdate();
+        }));
+  } else if (selectedIndex == 4 && !isNewServer) {
+    // Delete server
+    OPDS_STORE.removeServer(static_cast<size_t>(serverIndex));
+    onBack();
+  }
+}
+
+void OpdsSettingsActivity::render(Activity::RenderLock&&) {
+  renderer.clearScreen();
+
+  const auto& metrics = UITheme::getInstance().getMetrics();
+  const auto pageWidth = renderer.getScreenWidth();
+  const auto pageHeight = renderer.getScreenHeight();
+  const char* header = isNewServer ? tr(STR_ADD_SERVER) : tr(STR_OPDS_BROWSER);
+  GUI.drawHeader(renderer, Rect{0, metrics.topPadding, pageWidth, metrics.headerHeight}, header);
+  GUI.drawSubHeader(renderer, Rect{0, metrics.topPadding + metrics.headerHeight, pageWidth, metrics.tabBarHeight},
+                    tr(STR_CALIBRE_URL_HINT));
+
+  const int contentTop = metrics.topPadding + metrics.headerHeight + metrics.verticalSpacing + metrics.tabBarHeight;
+  const int contentHeight = pageHeight - contentTop - metrics.buttonHintsHeight - metrics.verticalSpacing * 2;
+  const int menuItems = getMenuItemCount();
+
+  const StrId fieldNames[] = {StrId::STR_SERVER_NAME, StrId::STR_OPDS_SERVER_URL, StrId::STR_USERNAME,
+                              StrId::STR_PASSWORD};
+
+  GUI.drawList(
+      renderer, Rect{0, contentTop, pageWidth, contentHeight}, menuItems, static_cast<int>(selectedIndex),
+      [this, &fieldNames](int index) {
+        if (index < BASE_ITEMS) {
+          return std::string(I18N.get(fieldNames[index]));
+        }
+        return std::string(tr(STR_DELETE_SERVER));
+      },
+      nullptr, nullptr,
+      [this](int index) {
+        if (index == 0) {
+          return editServer.name.empty() ? std::string(tr(STR_NOT_SET)) : editServer.name;
+        } else if (index == 1) {
+          return editServer.url.empty() ? std::string(tr(STR_NOT_SET)) : editServer.url;
+        } else if (index == 2) {
+          return editServer.username.empty() ? std::string(tr(STR_NOT_SET)) : editServer.username;
+        } else if (index == 3) {
+          return editServer.password.empty() ? std::string(tr(STR_NOT_SET)) : std::string("******");
+        }
+        return std::string("");
+      },
+      true);
+
+  const auto labels = mappedInput.mapLabels(tr(STR_BACK), tr(STR_SELECT), tr(STR_DIR_UP), tr(STR_DIR_DOWN));
+  GUI.drawButtonHints(renderer, labels.btn1, labels.btn2, labels.btn3, labels.btn4);
+
+  renderer.displayBuffer();
+}

src/activities/settings/OpdsSettingsActivity.h

@@ -0,0 +1,40 @@
+#pragma once
+
+#include <functional>
+
+#include "OpdsServerStore.h"
+#include "activities/ActivityWithSubactivity.h"
+#include "util/ButtonNavigator.h"
+
+/**
+ * Edit screen for a single OPDS server.
+ * Shows Name, URL, Username, Password fields and a Delete option.
+ * Used for both adding new servers and editing existing ones.
+ */
+class OpdsSettingsActivity final : public ActivityWithSubactivity {
+ public:
+  /**
+   * @param serverIndex Index into OpdsServerStore, or -1 for a new server
+   */
+  explicit OpdsSettingsActivity(GfxRenderer& renderer, MappedInputManager& mappedInput,
+                                const std::function<void()>& onBack, int serverIndex = -1)
+      : ActivityWithSubactivity("OpdsSettings", renderer, mappedInput), onBack(onBack), serverIndex(serverIndex) {}
+
+  void onEnter() override;
+  void onExit() override;
+  void loop() override;
+  void render(Activity::RenderLock&&) override;
+
+ private:
+  ButtonNavigator buttonNavigator;
+
+  size_t selectedIndex = 0;
+  const std::function<void()> onBack;
+  int serverIndex;
+  OpdsServer editServer;
+  bool isNewServer = false;
+
+  int getMenuItemCount() const;
+  void handleSelection();
+  void saveServer();
+};

src/activities/settings/SettingsActivity.cpp

@@ -7,7 +7,7 @@
 #include <cstdlib>
 
 #include "ButtonRemapActivity.h"
-#include "CalibreSettingsActivity.h"
+#include "OpdsServerListActivity.h"
 #include "ClearCacheActivity.h"
 #include "CrossPointSettings.h"
 #include "KOReaderSettingsActivity.h"
@@ -202,7 +202,7 @@ void SettingsActivity::toggleCurrentSetting() {
         enterSubActivity(new KOReaderSettingsActivity(renderer, mappedInput, onComplete));
         break;
       case SettingAction::OPDSBrowser:
-        enterSubActivity(new CalibreSettingsActivity(renderer, mappedInput, onComplete));
+        enterSubActivity(new OpdsServerListActivity(renderer, mappedInput, onComplete));
         break;
       case SettingAction::Network:
         enterSubActivity(new WifiSelectionActivity(renderer, mappedInput, onCompleteBool, false));

src/main.cpp

@@ -19,6 +19,7 @@
 #include "CrossPointState.h"
 #include "KOReaderCredentialStore.h"
 #include "MappedInputManager.h"
+#include "OpdsServerStore.h"
 #include "RecentBooksStore.h"
 #include "activities/boot_sleep/BootActivity.h"
 #include "activities/boot_sleep/SleepActivity.h"
@@ -28,6 +29,7 @@
 #include "activities/home/RecentBooksActivity.h"
 #include "activities/network/CrossPointWebServerActivity.h"
 #include "activities/reader/ReaderActivity.h"
+#include "activities/settings/OpdsServerListActivity.h"
 #include "activities/settings/SettingsActivity.h"
 #include "activities/util/FullScreenMessageActivity.h"
 #include "components/UITheme.h"
@@ -261,7 +263,18 @@ void onGoToMyLibraryWithPath(const std::string& path, bool initialSkipRelease) {
 
 void onGoToBrowser() {
   exitActivity();
-  enterNewActivity(new OpdsBookBrowserActivity(renderer, mappedInputManager, onGoHome));
+  const auto& servers = OPDS_STORE.getServers();
+  if (servers.size() == 1) {
+    enterNewActivity(new OpdsBookBrowserActivity(renderer, mappedInputManager, onGoHome, servers[0]));
+  } else {
+    enterNewActivity(new OpdsServerListActivity(renderer, mappedInputManager, onGoHome, [](size_t serverIndex) {
+      const auto* server = OPDS_STORE.getServer(serverIndex);
+      if (server) {
+        exitActivity();
+        enterNewActivity(new OpdsBookBrowserActivity(renderer, mappedInputManager, onGoHome, *server));
+      }
+    }));
+  }
 }
 
 void onGoHome() {
@@ -343,6 +356,7 @@ void setup() {
 
   I18N.loadSettings();
   KOREADER_STORE.loadFromFile();
+  OPDS_STORE.loadFromFile();
   BootNtpSync::start();
   UITheme::getInstance().reload();
   ButtonNavigator::setMappedInputManager(mappedInputManager);

src/network/CrossPointWebServer.cpp

@@ -11,6 +11,7 @@
 #include <algorithm>
 
 #include "CrossPointSettings.h"
+#include "OpdsServerStore.h"
 #include "SettingsList.h"
 #include "html/FilesPageHtml.generated.h"
 #include "html/HomePageHtml.generated.h"
@@ -156,6 +157,11 @@ void CrossPointWebServer::begin() {
   server->on("/api/settings", HTTP_GET, [this] { handleGetSettings(); });
   server->on("/api/settings", HTTP_POST, [this] { handlePostSettings(); });
 
+  // OPDS server management endpoints
+  server->on("/api/opds", HTTP_GET, [this] { handleGetOpdsServers(); });
+  server->on("/api/opds", HTTP_POST, [this] { handlePostOpdsServer(); });
+  server->on("/api/opds/delete", HTTP_POST, [this] { handleDeleteOpdsServer(); });
+
   server->onNotFound([this] { handleNotFound(); });
   LOG_DBG("WEB", "[MEM] Free heap after route setup: %d bytes", ESP.getFreeHeap());
 
@@ -1157,6 +1163,116 @@ void CrossPointWebServer::handlePostSettings() {
   server->send(200, "text/plain", String("Applied ") + String(applied) + " setting(s)");
 }
 
+// ---- OPDS Server Management API ----
+
+void CrossPointWebServer::handleGetOpdsServers() const {
+  const auto& servers = OPDS_STORE.getServers();
+
+  server->setContentLength(CONTENT_LENGTH_UNKNOWN);
+  server->send(200, "application/json", "");
+  server->sendContent("[");
+
+  constexpr size_t outputSize = 512;
+  char output[outputSize];
+  bool first = true;
+
+  for (size_t i = 0; i < servers.size(); i++) {
+    JsonDocument doc;
+    doc["name"] = servers[i].name;
+    doc["url"] = servers[i].url;
+    doc["username"] = servers[i].username;
+    doc["hasPassword"] = !servers[i].password.empty();
+
+    const size_t written = serializeJson(doc, output, outputSize);
+    if (written >= outputSize) continue;
+
+    if (!first) server->sendContent(",");
+    server->sendContent(output);
+    first = false;
+  }
+
+  server->sendContent("]");
+  LOG_DBG("WEB", "Served OPDS servers API (%zu servers)", servers.size());
+}
+
+void CrossPointWebServer::handlePostOpdsServer() {
+  if (!server->hasArg("plain")) {
+    server->send(400, "text/plain", "Missing JSON body");
+    return;
+  }
+
+  const String body = server->arg("plain");
+  JsonDocument doc;
+  const DeserializationError err = deserializeJson(doc, body);
+  if (err) {
+    server->send(400, "text/plain", String("Invalid JSON: ") + err.c_str());
+    return;
+  }
+
+  OpdsServer opdsServer;
+  opdsServer.name = doc["name"] | std::string("");
+  opdsServer.url = doc["url"] | std::string("");
+  opdsServer.username = doc["username"] | std::string("");
+
+  bool hasPasswordField = doc["password"].is<const char*>() || doc["password"].is<std::string>();
+  std::string password = doc["password"] | std::string("");
+
+  if (doc["index"].is<int>()) {
+    int idx = doc["index"].as<int>();
+    if (idx < 0 || idx >= static_cast<int>(OPDS_STORE.getCount())) {
+      server->send(400, "text/plain", "Invalid server index");
+      return;
+    }
+    if (!hasPasswordField) {
+      const auto* existing = OPDS_STORE.getServer(static_cast<size_t>(idx));
+      if (existing) password = existing->password;
+    }
+    opdsServer.password = password;
+    OPDS_STORE.updateServer(static_cast<size_t>(idx), opdsServer);
+    LOG_DBG("WEB", "Updated OPDS server at index %d", idx);
+  } else {
+    opdsServer.password = password;
+    if (!OPDS_STORE.addServer(opdsServer)) {
+      server->send(400, "text/plain", "Cannot add server (limit reached)");
+      return;
+    }
+    LOG_DBG("WEB", "Added new OPDS server: %s", opdsServer.name.c_str());
+  }
+
+  server->send(200, "text/plain", "OK");
+}
+
+// Uses POST (not HTTP DELETE) because ESP32 WebServer doesn't support DELETE with body.
+void CrossPointWebServer::handleDeleteOpdsServer() {
+  if (!server->hasArg("plain")) {
+    server->send(400, "text/plain", "Missing JSON body");
+    return;
+  }
+
+  const String body = server->arg("plain");
+  JsonDocument doc;
+  const DeserializationError err = deserializeJson(doc, body);
+  if (err) {
+    server->send(400, "text/plain", String("Invalid JSON: ") + err.c_str());
+    return;
+  }
+
+  if (!doc["index"].is<int>()) {
+    server->send(400, "text/plain", "Missing index");
+    return;
+  }
+
+  int idx = doc["index"].as<int>();
+  if (idx < 0 || idx >= static_cast<int>(OPDS_STORE.getCount())) {
+    server->send(400, "text/plain", "Invalid server index");
+    return;
+  }
+
+  OPDS_STORE.removeServer(static_cast<size_t>(idx));
+  LOG_DBG("WEB", "Deleted OPDS server at index %d", idx);
+  server->send(200, "text/plain", "OK");
+}
+
 // WebSocket callback trampoline
 void CrossPointWebServer::wsEventCallback(uint8_t num, WStype_t type, uint8_t* payload, size_t length) {
   if (wsInstance) {

src/network/CrossPointWebServer.h

@@ -105,4 +105,9 @@ class CrossPointWebServer {
   void handleSettingsPage() const;
   void handleGetSettings() const;
   void handlePostSettings();
+
+  // OPDS server handlers
+  void handleGetOpdsServers() const;
+  void handlePostOpdsServer();
+  void handleDeleteOpdsServer();
 };

src/network/HttpDownloader.cpp

@@ -9,12 +9,49 @@
 
 #include <cstring>
 #include <memory>
+#include <utility>
 
-#include "CrossPointSettings.h"
 #include "util/UrlUtils.h"
 
-bool HttpDownloader::fetchUrl(const std::string& url, Stream& outContent) {
+namespace {
-  // Use WiFiClientSecure for HTTPS, regular WiFiClient for HTTP
+class FileWriteStream final : public Stream {
+ public:
+  FileWriteStream(FsFile& file, size_t total, HttpDownloader::ProgressCallback progress)
+      : file_(file), total_(total), progress_(std::move(progress)) {}
+
+  size_t write(uint8_t byte) override { return write(&byte, 1); }
+
+  size_t write(const uint8_t* buffer, size_t size) override {
+    const size_t written = file_.write(buffer, size);
+    if (written != size) {
+      writeOk_ = false;
+    }
+    downloaded_ += written;
+    if (progress_ && total_ > 0) {
+      progress_(downloaded_, total_);
+    }
+    return written;
+  }
+
+  int available() override { return 0; }
+  int read() override { return -1; }
+  int peek() override { return -1; }
+  void flush() override { file_.flush(); }
+
+  size_t downloaded() const { return downloaded_; }
+  bool ok() const { return writeOk_; }
+
+ private:
+  FsFile& file_;
+  size_t total_;
+  size_t downloaded_ = 0;
+  bool writeOk_ = true;
+  HttpDownloader::ProgressCallback progress_;
+};
+}  // namespace
+
+bool HttpDownloader::fetchUrl(const std::string& url, Stream& outContent, const std::string& username,
+                              const std::string& password) {
   std::unique_ptr<WiFiClient> client;
   if (UrlUtils::isHttpsUrl(url)) {
     auto* secureClient = new WiFiClientSecure();
@@ -31,9 +68,8 @@ bool HttpDownloader::fetchUrl(const std::string& url, Stream& outContent) {
   http.setFollowRedirects(HTTPC_STRICT_FOLLOW_REDIRECTS);
   http.addHeader("User-Agent", "CrossPoint-ESP32-" CROSSPOINT_VERSION);
 
-  // Add Basic HTTP auth if credentials are configured
+  if (!username.empty() && !password.empty()) {
-  if (strlen(SETTINGS.opdsUsername) > 0 && strlen(SETTINGS.opdsPassword) > 0) {
+    std::string credentials = username + ":" + password;
-    std::string credentials = std::string(SETTINGS.opdsUsername) + ":" + SETTINGS.opdsPassword;
     String encoded = base64::encode(credentials.c_str());
     http.addHeader("Authorization", "Basic " + encoded);
   }
@@ -53,9 +89,10 @@ bool HttpDownloader::fetchUrl(const std::string& url, Stream& outContent) {
   return true;
 }
 
-bool HttpDownloader::fetchUrl(const std::string& url, std::string& outContent) {
+bool HttpDownloader::fetchUrl(const std::string& url, std::string& outContent, const std::string& username,
+                              const std::string& password) {
   StreamString stream;
-  if (!fetchUrl(url, stream)) {
+  if (!fetchUrl(url, stream, username, password)) {
     return false;
   }
   outContent = stream.c_str();
@@ -63,8 +100,8 @@ bool HttpDownloader::fetchUrl(const std::string& url, std::string& outContent) {
 }
 
 HttpDownloader::DownloadError HttpDownloader::downloadToFile(const std::string& url, const std::string& destPath,
-                                                             ProgressCallback progress) {
+                                                             ProgressCallback progress, const std::string& username,
-  // Use WiFiClientSecure for HTTPS, regular WiFiClient for HTTP
+                                                             const std::string& password) {
   std::unique_ptr<WiFiClient> client;
   if (UrlUtils::isHttpsUrl(url)) {
     auto* secureClient = new WiFiClientSecure();
@@ -82,9 +119,8 @@ HttpDownloader::DownloadError HttpDownloader::downloadToFile(const std::string&
   http.setFollowRedirects(HTTPC_STRICT_FOLLOW_REDIRECTS);
   http.addHeader("User-Agent", "CrossPoint-ESP32-" CROSSPOINT_VERSION);
 
-  // Add Basic HTTP auth if credentials are configured
+  if (!username.empty() && !password.empty()) {
-  if (strlen(SETTINGS.opdsUsername) > 0 && strlen(SETTINGS.opdsPassword) > 0) {
+    std::string credentials = username + ":" + password;
-    std::string credentials = std::string(SETTINGS.opdsUsername) + ":" + SETTINGS.opdsPassword;
     String encoded = base64::encode(credentials.c_str());
     http.addHeader("Authorization", "Basic " + encoded);
   }
@@ -96,8 +132,13 @@ HttpDownloader::DownloadError HttpDownloader::downloadToFile(const std::string&
     return HTTP_ERROR;
   }
 
-  const size_t contentLength = http.getSize();
+  const int64_t reportedLength = http.getSize();
-  LOG_DBG("HTTP", "Content-Length: %zu", contentLength);
+  const size_t contentLength = reportedLength > 0 ? static_cast<size_t>(reportedLength) : 0;
+  if (contentLength > 0) {
+    LOG_DBG("HTTP", "Content-Length: %zu", contentLength);
+  } else {
+    LOG_DBG("HTTP", "Content-Length: unknown");
+  }
 
   // Remove existing file if present
   if (Storage.exists(destPath.c_str())) {
@@ -112,56 +153,29 @@ HttpDownloader::DownloadError HttpDownloader::downloadToFile(const std::string&
     return FILE_ERROR;
   }
 
-  // Get the stream for chunked reading
+  // Let HTTPClient handle chunked decoding and stream body bytes into the file.
-  WiFiClient* stream = http.getStreamPtr();
-  if (!stream) {
-    LOG_ERR("HTTP", "Failed to get stream");
-    file.close();
-    Storage.remove(destPath.c_str());
-    http.end();
-    return HTTP_ERROR;
-  }
-
-  // Download in chunks
-  uint8_t buffer[DOWNLOAD_CHUNK_SIZE];
-  size_t downloaded = 0;
   const size_t total = contentLength > 0 ? contentLength : 0;
-
+  FileWriteStream fileStream(file, total, progress);
-  while (http.connected() && (contentLength == 0 || downloaded < contentLength)) {
+  http.writeToStream(&fileStream);
-    const size_t available = stream->available();
-    if (available == 0) {
-      delay(1);
-      continue;
-    }
-
-    const size_t toRead = available < DOWNLOAD_CHUNK_SIZE ? available : DOWNLOAD_CHUNK_SIZE;
-    const size_t bytesRead = stream->readBytes(buffer, toRead);
-
-    if (bytesRead == 0) {
-      break;
-    }
-
-    const size_t written = file.write(buffer, bytesRead);
-    if (written != bytesRead) {
-      LOG_ERR("HTTP", "Write failed: wrote %zu of %zu bytes", written, bytesRead);
-      file.close();
-      Storage.remove(destPath.c_str());
-      http.end();
-      return FILE_ERROR;
-    }
-
-    downloaded += bytesRead;
-
-    if (progress && total > 0) {
-      progress(downloaded, total);
-    }
-  }
 
   file.close();
   http.end();
 
+  const size_t downloaded = fileStream.downloaded();
   LOG_DBG("HTTP", "Downloaded %zu bytes", downloaded);
 
+  if (!fileStream.ok()) {
+    LOG_ERR("HTTP", "Write failed during download");
+    Storage.remove(destPath.c_str());
+    return FILE_ERROR;
+  }
+
+  if (contentLength == 0 && downloaded == 0) {
+    LOG_ERR("HTTP", "Download failed: no data received");
+    Storage.remove(destPath.c_str());
+    return HTTP_ERROR;
+  }
+
   // Verify download size if known
   if (contentLength > 0 && downloaded != contentLength) {
     LOG_ERR("HTTP", "Size mismatch: got %zu, expected %zu", downloaded, contentLength);

src/network/HttpDownloader.h

@@ -20,24 +20,20 @@ class HttpDownloader {
   };
 
   /**
-   * Fetch text content from a URL.
+   * Fetch text content from a URL with optional credentials.
-   * @param url The URL to fetch
-   * @param outContent The fetched content (output)
-   * @return true if fetch succeeded, false on error
    */
-  static bool fetchUrl(const std::string& url, std::string& outContent);
+  static bool fetchUrl(const std::string& url, std::string& outContent, const std::string& username = "",
+                       const std::string& password = "");
 
-  static bool fetchUrl(const std::string& url, Stream& stream);
+  static bool fetchUrl(const std::string& url, Stream& stream, const std::string& username = "",
+                       const std::string& password = "");
 
   /**
-   * Download a file to the SD card.
+   * Download a file to the SD card with optional credentials.
-   * @param url The URL to download
-   * @param destPath The destination path on SD card
-   * @param progress Optional progress callback
-   * @return DownloadError indicating success or failure type
    */
   static DownloadError downloadToFile(const std::string& url, const std::string& destPath,
-                                      ProgressCallback progress = nullptr);
+                                      ProgressCallback progress = nullptr, const std::string& username = "",
+                                      const std::string& password = "");
 
  private:
   static constexpr size_t DOWNLOAD_CHUNK_SIZE = 1024;

src/network/html/SettingsPage.html

@@ -180,6 +180,48 @@
       from { transform: rotate(0deg); }
       to { transform: rotate(360deg); }
     }
+    .opds-server {
+      border: 1px solid var(--border-color);
+      border-radius: 6px;
+      padding: 12px;
+      margin: 10px 0;
+    }
+    .opds-server .setting-row:last-child {
+      border-bottom: none;
+    }
+    .opds-actions {
+      display: flex;
+      gap: 8px;
+      margin-top: 8px;
+    }
+    .btn-small {
+      padding: 6px 14px;
+      border: none;
+      border-radius: 4px;
+      cursor: pointer;
+      font-size: 0.9em;
+    }
+    .btn-add {
+      background-color: var(--accent-color);
+      color: white;
+    }
+    .btn-add:hover {
+      background-color: var(--accent-hover-color);
+    }
+    .btn-delete {
+      background-color: #e74c3c;
+      color: white;
+    }
+    .btn-delete:hover {
+      background-color: #c0392b;
+    }
+    .btn-save-server {
+      background-color: #27ae60;
+      color: white;
+    }
+    .btn-save-server:hover {
+      background-color: #219a52;
+    }
     @media (max-width: 600px) {
       body {
         padding: 10px;
@@ -231,6 +273,8 @@
     <button class="save-btn" id="saveBtn" onclick="saveSettings()">Save Settings</button>
   </div>
 
+  <div id="opds-container"></div>
+
   <div class="card">
     <p style="text-align: center; color: #95a5a6; margin: 0;">
       CrossPoint E-Reader • Open Source
@@ -409,6 +453,116 @@
   }
 
   loadSettings();
+
+  // --- OPDS Server Management ---
+  let opdsServers = [];
+
+  function renderOpdsServer(srv, idx) {
+    const isNew = idx === -1;
+    const id = isNew ? 'new' : idx;
+    return '<div class="opds-server" id="opds-' + id + '">' +
+      '<div class="setting-row">' +
+        '<span class="setting-name">Server Name</span>' +
+        '<span class="setting-control"><input type="text" id="opds-name-' + id + '" value="' + escapeHtml(srv.name || '') + '"></span>' +
+      '</div>' +
+      '<div class="setting-row">' +
+        '<span class="setting-name">URL</span>' +
+        '<span class="setting-control"><input type="text" id="opds-url-' + id + '" value="' + escapeHtml(srv.url || '') + '"></span>' +
+      '</div>' +
+      '<div class="setting-row">' +
+        '<span class="setting-name">Username</span>' +
+        '<span class="setting-control"><input type="text" id="opds-user-' + id + '" value="' + escapeHtml(srv.username || '') + '"></span>' +
+      '</div>' +
+      '<div class="setting-row">' +
+        '<span class="setting-name">Password</span>' +
+        '<span class="setting-control"><input type="password" id="opds-pass-' + id + '" placeholder="' + (srv.hasPassword ? '(unchanged)' : '') + '"></span>' +
+      '</div>' +
+      '<div class="opds-actions">' +
+        '<button class="btn-small btn-save-server" onclick="saveOpdsServer(' + idx + ')">Save</button>' +
+        (isNew ? '' : '<button class="btn-small btn-delete" onclick="deleteOpdsServer(' + idx + ')">Delete</button>') +
+      '</div>' +
+    '</div>';
+  }
+
+  function renderOpdsSection() {
+    const container = document.getElementById('opds-container');
+    let html = '<div class="card"><h2>OPDS Servers</h2>';
+
+    if (opdsServers.length === 0) {
+      html += '<p style="color:var(--label-color);text-align:center;">No OPDS servers configured</p>';
+    } else {
+      opdsServers.forEach(function(srv, idx) {
+        html += renderOpdsServer(srv, idx);
+      });
+    }
+
+    html += '<div style="margin-top:12px;text-align:center;">' +
+      '<button class="btn-small btn-add" onclick="addOpdsServer()">+ Add Server</button>' +
+    '</div></div>';
+    container.innerHTML = html;
+  }
+
+  async function loadOpdsServers() {
+    try {
+      const resp = await fetch('/api/opds');
+      if (!resp.ok) throw new Error('Failed to load');
+      opdsServers = await resp.json();
+      renderOpdsSection();
+    } catch (e) {
+      console.error('OPDS load error:', e);
+    }
+  }
+
+  function addOpdsServer() {
+    const container = document.getElementById('opds-container');
+    const card = container.querySelector('.card');
+    const addBtn = card.querySelector('.btn-add').parentElement;
+    if (document.getElementById('opds-new')) return;
+    addBtn.insertAdjacentHTML('beforebegin', renderOpdsServer({name:'',url:'',username:'',hasPassword:false}, -1));
+  }
+
+  async function saveOpdsServer(idx) {
+    const id = idx === -1 ? 'new' : idx;
+    const data = {
+      name: document.getElementById('opds-name-' + id).value,
+      url: document.getElementById('opds-url-' + id).value,
+      username: document.getElementById('opds-user-' + id).value,
+    };
+    const pass = document.getElementById('opds-pass-' + id).value;
+    if (pass) data.password = pass;
+    if (idx >= 0) data.index = idx;
+
+    try {
+      const resp = await fetch('/api/opds', {
+        method: 'POST',
+        headers: {'Content-Type': 'application/json'},
+        body: JSON.stringify(data)
+      });
+      if (!resp.ok) throw new Error(await resp.text());
+      showMessage('OPDS server saved!', false);
+      await loadOpdsServers();
+    } catch (e) {
+      showMessage('Error: ' + e.message, true);
+    }
+  }
+
+  async function deleteOpdsServer(idx) {
+    if (!confirm('Delete this OPDS server?')) return;
+    try {
+      const resp = await fetch('/api/opds/delete', {
+        method: 'POST',
+        headers: {'Content-Type': 'application/json'},
+        body: JSON.stringify({index: idx})
+      });
+      if (!resp.ok) throw new Error(await resp.text());
+      showMessage('OPDS server deleted', false);
+      await loadOpdsServers();
+    } catch (e) {
+      showMessage('Error: ' + e.message, true);
+    }
+  }
+
+  loadOpdsServers();
 </script>
 </body>
 </html>