Merge 111d4b8b16 into f67c544e16

## Summary

Resolves #562 

Implements regex change to support valid characters discussed by
@daveallie in issue
[here](https://github.com/crosspoint-reader/crosspoint-reader/issues/562#issuecomment-3830809156).

Also rejects `.` and `..` as folder names which are invalid in FAT32 and
exFAT filesystems

## Additional Context
- Unsure on the wording for the alert, it feels overly explicit, but
that might be a good thing. Happy to change.

---

### AI Usage

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? _**< PARTIALLY >**_

docs/webserver.md

@@ -153,7 +153,7 @@ Click **File Manager** to access file management features.
 
 1. Click the **+ Add** button in the top-right corner
 2. Select **New Folder** from the dropdown menu
-3. Enter a folder name (letters, numbers, underscores, and hyphens only)
+3. Enter a folder name (must not contain characters \" * : < > ? / \\ | and must not be . or ..)
 4. Click **Create Folder**
 
 This is useful for organizing your ebooks by genre, author, or series.

src/RecentBooksStore.cpp

@@ -1,11 +1,15 @@
 #include "RecentBooksStore.h"
 
+#include <Epub.h>
 #include <HardwareSerial.h>
 #include <SDCardManager.h>
 #include <Serialization.h>
+#include <Xtc.h>
 
 #include <algorithm>
 
+#include "util/StringUtils.h"
+
 namespace {
 constexpr uint8_t RECENT_BOOKS_FILE_VERSION = 3;
 constexpr char RECENT_BOOKS_FILE[] = "/.crosspoint/recent.bin";
@@ -59,6 +63,34 @@ bool RecentBooksStore::saveToFile() const {
   return true;
 }
 
+RecentBook RecentBooksStore::getDataFromBook(std::string path) const {
+  std::string lastBookFileName = "";
+  const size_t lastSlash = path.find_last_of('/');
+  if (lastSlash != std::string::npos) {
+    lastBookFileName = path.substr(lastSlash + 1);
+  }
+
+  Serial.printf("Loading recent book: %s\n", path.c_str());
+
+  // If epub, try to load the metadata for title/author and cover
+  if (StringUtils::checkFileExtension(lastBookFileName, ".epub")) {
+    Epub epub(path, "/.crosspoint");
+    epub.load(false);
+    return RecentBook{path, epub.getTitle(), epub.getAuthor(), epub.getThumbBmpPath()};
+  } else if (StringUtils::checkFileExtension(lastBookFileName, ".xtch") ||
+             StringUtils::checkFileExtension(lastBookFileName, ".xtc")) {
+    // Handle XTC file
+    Xtc xtc(path, "/.crosspoint");
+    if (xtc.load()) {
+      return RecentBook{path, xtc.getTitle(), xtc.getAuthor(), xtc.getThumbBmpPath()};
+    }
+  } else if (StringUtils::checkFileExtension(lastBookFileName, ".txt") ||
+             StringUtils::checkFileExtension(lastBookFileName, ".md")) {
+    return RecentBook{path, lastBookFileName, "", ""};
+  }
+  return RecentBook{path, "", "", ""};
+}
+
 bool RecentBooksStore::loadFromFile() {
   FsFile inputFile;
   if (!SdMan.openFileForRead("RBS", RECENT_BOOKS_FILE, inputFile)) {
@@ -68,7 +100,7 @@ bool RecentBooksStore::loadFromFile() {
   uint8_t version;
   serialization::readPod(inputFile, version);
   if (version != RECENT_BOOKS_FILE_VERSION) {
-    if (version == 1) {
+    if (version == 1 || version == 2) {
       // Old version, just read paths
       uint8_t count;
       serialization::readPod(inputFile, count);
@@ -77,24 +109,18 @@ bool RecentBooksStore::loadFromFile() {
       for (uint8_t i = 0; i < count; i++) {
         std::string path;
         serialization::readString(inputFile, path);
-        // Title and author will be empty, they will be filled when the book is
+
-        // opened again
+        // load book to get missing data
-        recentBooks.push_back({path, "", "", ""});
+        RecentBook book = getDataFromBook(path);
-      }
+        if (book.title.empty() && book.author.empty() && version == 2) {
-    } else if (version == 2) {
+          // Fall back to loading what we can from the store
-      // Old version, just read paths, titles and authors
+          std::string title, author;
-      uint8_t count;
-      serialization::readPod(inputFile, count);
-      recentBooks.clear();
-      recentBooks.reserve(count);
-      for (uint8_t i = 0; i < count; i++) {
-        std::string path, title, author;
-        serialization::readString(inputFile, path);
           serialization::readString(inputFile, title);
           serialization::readString(inputFile, author);
-        // Title and author will be empty, they will be filled when the book is
-        // opened again
           recentBooks.push_back({path, title, author, ""});
+        } else {
+          recentBooks.push_back(book);
+        }
       }
     } else {
       Serial.printf("[%lu] [RBS] Deserialization failed: Unknown version %u\n", millis(), version);

src/RecentBooksStore.h

@@ -36,6 +36,7 @@ class RecentBooksStore {
   bool saveToFile() const;
 
   bool loadFromFile();
+  RecentBook getDataFromBook(std::string path) const;
 };
 
 // Helper macro to access recent books store

src/activities/reader/TxtReaderActivity.cpp

@@ -58,9 +58,11 @@ void TxtReaderActivity::onEnter() {
   txt->setupCacheDir();
 
   // Save current txt as last opened file and add to recent books
-  APP_STATE.openEpubPath = txt->getPath();
+  auto filePath = txt->getPath();
+  auto fileName = filePath.substr(filePath.rfind('/') + 1);
+  APP_STATE.openEpubPath = filePath;
   APP_STATE.saveToFile();
-  RECENT_BOOKS.addBook(txt->getPath(), "", "", "");
+  RECENT_BOOKS.addBook(filePath, fileName, "", "");
 
   // Trigger first update
   updateRequired = true;

src/network/html/FilesPage.html

@@ -1146,10 +1146,10 @@ function retryAllFailedUploads() {
       return;
     }
 
-    // Validate folder name (no special characters except underscore and hyphen)
+    // Validate folder name
-    const validName = /^[a-zA-Z0-9_\-]+$/.test(folderName);
+    const validName = /^(?!\.{1,2}$)[^"*:<>?\/\\|]+$/.test(folderName);
     if (!validName) {
-      alert('Folder name can only contain letters, numbers, underscores, and hyphens.');
+      alert('Folder name cannot contain \" * : < > ? / \\ | and must not be . or ..');
       return;
     }