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add OPDS search support & next/prev page navigation (upstream #1462)

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This commit is contained in:
jpirnay
2026-04-12 22:49:33 +02:00
parent 52a754b5e4
commit cf3ab19c77
20 changed files with 186 additions and 211 deletions
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lib/OpdsParser/OpdsParser.cpp
+53 -102
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@@ -25,15 +25,12 @@ OpdsParser::~OpdsParser() {
size_t OpdsParser::write(uint8_t c) { return write(&c, 1); }
size_t OpdsParser::write(const uint8_t* xmlData, const size_t length) {
if (errorOccured) {
return length;
}
if (errorOccured) return length;
XML_SetUserData(parser, this);
XML_SetElementHandler(parser, startElement, endElement);
XML_SetCharacterDataHandler(parser, characterData);
// Parse in chunks to avoid large buffer allocations
const char* currentPos = reinterpret_cast<const char*>(xmlData);
size_t remaining = length;
constexpr size_t chunkSize = 1024;
@@ -42,9 +39,7 @@ size_t OpdsParser::write(const uint8_t* xmlData, const size_t length) {
void* const buf = XML_GetBuffer(parser, chunkSize);
if (!buf) {
errorOccured = true;
LOG_DBG("OPDS", "Couldn't allocate memory for buffer");
XML_ParserFree(parser);
parser = nullptr;
return length;
}
@@ -53,13 +48,9 @@ size_t OpdsParser::write(const uint8_t* xmlData, const size_t length) {
if (XML_ParseBuffer(parser, static_cast<int>(toRead), 0) == XML_STATUS_ERROR) {
errorOccured = true;
LOG_DBG("OPDS", "Parse error at line %lu: %s", XML_GetCurrentLineNumber(parser),
XML_ErrorString(XML_GetErrorCode(parser)));
XML_ParserFree(parser);
parser = nullptr;
return length;
}
currentPos += toRead;
remaining -= toRead;
}
@@ -78,30 +69,25 @@ bool OpdsParser::error() const { return errorOccured; }
void OpdsParser::clear() {
entries.clear();
searchTemplate.clear();
nextPageUrl.clear();
prevPageUrl.clear();
currentEntry = OpdsEntry{};
currentText.clear();
inEntry = false;
inTitle = false;
inAuthor = false;
inAuthorName = false;
inId = false;
inEntry = inTitle = inAuthor = inAuthorName = inId = false;
}
std::vector<OpdsEntry> OpdsParser::getBooks() const {
std::vector<OpdsEntry> books;
for (const auto& entry : entries) {
if (entry.type == OpdsEntryType::BOOK) {
books.push_back(entry);
}
if (entry.type == OpdsEntryType::BOOK) books.push_back(entry);
}
return books;
}
const char* OpdsParser::findAttribute(const XML_Char** atts, const char* name) {
for (int i = 0; atts[i]; i += 2) {
if (strcmp(atts[i], name) == 0) {
return atts[i + 1];
}
if (strcmp(atts[i], name) == 0) return atts[i + 1];
}
return nullptr;
}
@@ -109,7 +95,38 @@ const char* OpdsParser::findAttribute(const XML_Char** atts, const char* name) {
void XMLCALL OpdsParser::startElement(void* userData, const XML_Char* name, const XML_Char** atts) {
auto* self = static_cast<OpdsParser*>(userData);
// Check for entry element (with or without namespace prefix)
if (strcmp(name, "link") == 0 || strstr(name, ":link") != nullptr) {
const char* href = findAttribute(atts, "href");
if (href) {
const char* rel = findAttribute(atts, "rel");
const char* type = findAttribute(atts, "type");
if (rel && strcmp(rel, "search") == 0) {
std::string sHref(href);
if (sHref.find("{searchTerms}") != std::string::npos) {
self->searchTemplate = sHref;
}
} else if (rel && strcmp(rel, "next") == 0 && !self->inEntry) {
self->nextPageUrl = href;
} else if (rel && strcmp(rel, "previous") == 0 && !self->inEntry) {
self->prevPageUrl = href;
}
if (self->inEntry) {
if (rel && type && strstr(rel, "opds-spec.org/acquisition") != nullptr &&
strcmp(type, "application/epub+zip") == 0) {
self->currentEntry.type = OpdsEntryType::BOOK;
self->currentEntry.href = href;
} else if (type && strstr(type, "application/atom+xml") != nullptr) {
if (self->currentEntry.type != OpdsEntryType::BOOK) {
self->currentEntry.type = OpdsEntryType::NAVIGATION;
self->currentEntry.href = href;
}
}
}
}
}
if (strcmp(name, "entry") == 0 || strstr(name, ":entry") != nullptr) {
self->inEntry = true;
self->currentEntry = OpdsEntry{};
@@ -118,112 +135,46 @@ void XMLCALL OpdsParser::startElement(void* userData, const XML_Char* name, cons
if (!self->inEntry) return;
// Check for title element
if (strcmp(name, "title") == 0 || strstr(name, ":title") != nullptr) {
self->inTitle = true;
self->currentText.clear();
return;
}
// Check for author element
if (strcmp(name, "author") == 0 || strstr(name, ":author") != nullptr) {
} else if (strcmp(name, "author") == 0 || strstr(name, ":author") != nullptr) {
self->inAuthor = true;
return;
}
// Check for author name element
if (self->inAuthor && (strcmp(name, "name") == 0 || strstr(name, ":name") != nullptr)) {
} else if (self->inAuthor && (strcmp(name, "name") == 0 || strstr(name, ":name") != nullptr)) {
self->inAuthorName = true;
self->currentText.clear();
return;
}
// Check for id element
if (strcmp(name, "id") == 0 || strstr(name, ":id") != nullptr) {
} else if (strcmp(name, "id") == 0 || strstr(name, ":id") != nullptr) {
self->inId = true;
self->currentText.clear();
return;
}
// Check for link element
if (strcmp(name, "link") == 0 || strstr(name, ":link") != nullptr) {
const char* rel = findAttribute(atts, "rel");
const char* type = findAttribute(atts, "type");
const char* href = findAttribute(atts, "href");
if (href) {
// Check for acquisition link with epub type (this is a downloadable book)
if (rel && type && strstr(rel, "opds-spec.org/acquisition") != nullptr &&
strcmp(type, "application/epub+zip") == 0) {
self->currentEntry.type = OpdsEntryType::BOOK;
self->currentEntry.href = href;
}
// Check for navigation link (subsection or no rel specified with atom+xml type)
else if (type && strstr(type, "application/atom+xml") != nullptr) {
// Only set navigation link if we don't already have an epub link
if (self->currentEntry.type != OpdsEntryType::BOOK) {
self->currentEntry.type = OpdsEntryType::NAVIGATION;
self->currentEntry.href = href;
}
}
}
}
}
void XMLCALL OpdsParser::endElement(void* userData, const XML_Char* name) {
auto* self = static_cast<OpdsParser*>(userData);
// Check for entry end
if (strcmp(name, "entry") == 0 || strstr(name, ":entry") != nullptr) {
// Only add entry if it has required fields (title and href)
if (!self->currentEntry.title.empty() && !self->currentEntry.href.empty()) {
self->entries.push_back(self->currentEntry);
}
self->inEntry = false;
self->currentEntry = OpdsEntry{};
return;
}
if (!self->inEntry) return;
// Check for title end
if (strcmp(name, "title") == 0 || strstr(name, ":title") != nullptr) {
if (self->inTitle) {
self->currentEntry.title = self->currentText;
}
self->inTitle = false;
return;
}
// Check for author end
if (strcmp(name, "author") == 0 || strstr(name, ":author") != nullptr) {
self->inAuthor = false;
return;
}
// Check for author name end
if (self->inAuthor && (strcmp(name, "name") == 0 || strstr(name, ":name") != nullptr)) {
if (self->inAuthorName) {
} else if (self->inEntry) {
if (strcmp(name, "title") == 0 || strstr(name, ":title") != nullptr) {
if (self->inTitle) self->currentEntry.title = self->currentText;
self->inTitle = false;
} else if (strcmp(name, "author") == 0 || strstr(name, ":author") != nullptr) {
self->inAuthor = false;
} else if (self->inAuthorName && (strcmp(name, "name") == 0 || strstr(name, ":name") != nullptr)) {
self->currentEntry.author = self->currentText;
self->inAuthorName = false;
} else if (strcmp(name, "id") == 0 || strstr(name, ":id") != nullptr) {
if (self->inId) self->currentEntry.id = self->currentText;
self->inId = false;
}
self->inAuthorName = false;
return;
}
// Check for id end
if (strcmp(name, "id") == 0 || strstr(name, ":id") != nullptr) {
if (self->inId) {
self->currentEntry.id = self->currentText;
}
self->inId = false;
return;
}
}
void XMLCALL OpdsParser::characterData(void* userData, const XML_Char* s, const int len) {
auto* self = static_cast<OpdsParser*>(userData);
// Only accumulate text when in a text element
if (self->inTitle || self->inAuthorName || self->inId) {
self->currentText.append(s, len);
}