service/DavXmlHelper.h
| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | #pragma once | ||
| 2 | |||
| 3 | #include <QDomDocument> | ||
| 4 | #include <QDomElement> | ||
| 5 | #include <QDomNodeList> | ||
| 6 | #include <QString> | ||
| 7 | #include <QXmlStreamReader> | ||
| 8 | #include <optional> | ||
| 9 | |||
| 10 | // ═══════════════════════════════════════════════════════ | ||
| 11 | // Shared DAV XML helpers (Sprint 32 – T-331) | ||
| 12 | // Extracted from CardDavClient.cpp for reuse in CalDavClient. | ||
| 13 | // ═══════════════════════════════════════════════════════ | ||
| 14 | |||
| 15 | namespace DavXmlHelper { | ||
| 16 | |||
| 17 | struct Limits { | ||
| 18 | qint64 maxBytes = 10 * 1024 * 1024; | ||
| 19 | int maxDepth = 64; | ||
| 20 | qint64 maxElements = 500000; | ||
| 21 | int maxAttributes = 64; | ||
| 22 | }; | ||
| 23 | |||
| 24 | // Streaming admission precedes DOM construction and its recursive destruction. | ||
| 25 | 1158 | inline std::optional<QDomDocument> parse(const QByteArray &bytes, const Limits &limits = {}) { | |
| 26 |
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1158 | if (bytes.size() > limits.maxBytes) |
| 27 | 1 | return std::nullopt; | |
| 28 |
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1157 | QXmlStreamReader reader(bytes); |
| 29 | 1157 | int depth = 0; | |
| 30 | 1157 | qint64 elements = 0; | |
| 31 | // Each iteration consumes one token from the bounded input byte array. | ||
| 32 |
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798048 | while (!reader.atEnd()) { |
| 33 |
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796900 | const auto token = reader.readNext(); |
| 34 |
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796900 | if (token == QXmlStreamReader::DTD || token == QXmlStreamReader::EntityReference) |
| 35 | 1 | return std::nullopt; | |
| 36 |
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796899 | if (token == QXmlStreamReader::StartElement) { |
| 37 |
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610373 | if (++depth > limits.maxDepth || ++elements > limits.maxElements || |
| 38 |
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610373 | reader.attributes().size() > limits.maxAttributes) |
| 39 | 8 | return std::nullopt; | |
| 40 |
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491709 | } else if (token == QXmlStreamReader::EndElement) { |
| 41 | 304795 | --depth; | |
| 42 | } | ||
| 43 | } | ||
| 44 |
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1148 | if (reader.hasError()) |
| 45 | 23 | return std::nullopt; | |
| 46 |
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1125 | QDomDocument document; |
| 47 |
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1125 | if (!document.setContent(bytes)) |
| 48 | ✗ | return std::nullopt; | |
| 49 |
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1125 | return document; |
| 50 | 1157 | } | |
| 51 | |||
| 52 | 1141 | inline bool parseInto(QDomDocument &document, const QByteArray &bytes, const Limits &limits = {}) { | |
| 53 |
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1141 | auto parsed = parse(bytes, limits); |
| 54 |
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1141 | if (!parsed) return false; |
| 55 |
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1121 | document = *parsed; |
| 56 | 1121 | return true; | |
| 57 | 1141 | } | |
| 58 | |||
| 59 | /// Elements found by local name, in document order. Offers the read API of | ||
| 60 | /// QDomNodeList (size/count/length/isEmpty/at/item), which Qt cannot build. | ||
| 61 | class ElementList { | ||
| 62 | public: | ||
| 63 | 28316 | void append(const QDomElement &element) { m_items.append(element); } | |
| 64 | 30007 | int size() const { return int(m_items.size()); } | |
| 65 | 29717 | int count() const { return size(); } | |
| 66 | int length() const { return size(); } | ||
| 67 | 5298 | bool isEmpty() const { return m_items.isEmpty(); } | |
| 68 |
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28304 | QDomNode at(int index) const { return m_items.value(index); } |
| 69 | QDomNode item(int index) const { return at(index); } | ||
| 70 | |||
| 71 | private: | ||
| 72 | QList<QDomElement> m_items; | ||
| 73 | }; | ||
| 74 | |||
| 75 | /// Every descendant element of `parent` whose local name is `localName`, | ||
| 76 | /// whatever its namespace prefix. The documents are parsed WITHOUT namespace | ||
| 77 | /// processing, so the local name is the tag after the first ':'. | ||
| 78 | /// S106-047: the former version tried the bare name and a fixed list of | ||
| 79 | /// common prefixes and returned an empty list for any other legal prefix | ||
| 80 | /// (x1:, ns0:, …) — callers took "empty" for success, and through the F-59 | ||
| 81 | /// prune that meant silent local data loss. | ||
| 82 | 11887 | inline ElementList findElementsByLocalName(const QDomNode &parent, const QString &localName) { | |
| 83 | 11887 | ElementList result; | |
| 84 | // Iterative pre-order traversal (stack-safe for deep documents). | ||
| 85 |
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11887 | QDomNode node = parent.firstChild(); |
| 86 |
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289173 | while (!node.isNull()) { |
| 87 |
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277286 | const QDomElement element = node.toElement(); |
| 88 |
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277286 | if (!element.isNull()) { |
| 89 |
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179838 | const QString tag = element.tagName(); |
| 90 |
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179838 | if (tag.mid(tag.indexOf(QLatin1Char(':')) + 1) == localName) |
| 91 |
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28316 | result.append(element); |
| 92 | 179838 | } | |
| 93 |
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277286 | if (!node.firstChild().isNull()) { |
| 94 |
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175579 | node = node.firstChild(); |
| 95 | 175579 | continue; | |
| 96 | } | ||
| 97 |
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277286 | while (!node.isNull() && node.nextSibling().isNull() && node.parentNode() != parent) |
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175579 | node = node.parentNode(); |
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101707 | if (node.isNull() || node == parent) break; |
| 100 |
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101707 | node = node.nextSibling(); |
| 101 | 277286 | } | |
| 102 | 11887 | return result; | |
| 103 | 11887 | } | |
| 104 | |||
| 105 | /// Find the first element by local name using namespace-agnostic traversal. | ||
| 106 | /// This handles any arbitrary namespace prefix (x1:, ns0:, etc.). | ||
| 107 | /// Note: the documents here are parsed WITHOUT namespace processing, so | ||
| 108 | /// QDomElement::localName() is always empty — the local name must be | ||
| 109 | /// derived from tagName() by stripping the prefix. QDom also does not | ||
| 110 | /// support the DOM "*" wildcard, so the fallback walks children manually. | ||
| 111 | 28403 | inline QDomElement findFirstElementByLocalName(const QDomElement &parent, | |
| 112 | const QString &localName) { | ||
| 113 | // Iterative pre-order traversal visits every descendant at most once. | ||
| 114 | // It also remains stack-safe if a caller provides an independently built DOM. | ||
| 115 |
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28403 | QDomNode node = parent.firstChild(); |
| 116 |
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422820 | while (!node.isNull()) { |
| 117 |
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421801 | const QDomElement element = node.toElement(); |
| 118 |
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421801 | if (!element.isNull()) { |
| 119 |
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275543 | const QString tag = element.tagName(); |
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275543 | if (tag.mid(tag.indexOf(QLatin1Char(':')) + 1) == localName) |
| 121 | 27384 | return element; | |
| 122 | 275543 | } | |
| 123 |
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394417 | if (!node.firstChild().isNull()) { |
| 124 |
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244008 | node = node.firstChild(); |
| 125 | 244008 | continue; | |
| 126 | } | ||
| 127 |
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361332 | while (!node.isNull() && node.nextSibling().isNull() && node.parentNode() != parent) |
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210923 | node = node.parentNode(); |
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150409 | if (node.isNull() || node == parent) break; |
| 130 |
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150409 | node = node.nextSibling(); |
| 131 | 394417 | } | |
| 132 |
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1019 | return {}; |
| 133 | 28403 | } | |
| 134 | |||
| 135 | /// Same but for the whole document. | ||
| 136 | 880 | inline ElementList findElementsByLocalNameDoc(const QDomDocument &doc, const QString &localName) { | |
| 137 | 880 | return findElementsByLocalName(doc, localName); | |
| 138 | } | ||
| 139 | |||
| 140 | /// Local name of an element of a document parsed without namespace processing. | ||
| 141 | 21659 | inline QString localNameOf(const QDomElement &element) { | |
| 142 |
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21659 | const QString tag = element.tagName(); |
| 143 |
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43318 | return element.localName().isEmpty() ? tag.mid(tag.indexOf(QLatin1Char(':')) + 1) : element.localName(); |
| 144 | 21659 | } | |
| 145 | |||
| 146 | /// The DAV:href inside the first `property` element (current-user-principal, | ||
| 147 | /// calendar-home-set, addressbook-home-set …); empty when missing. | ||
| 148 | 12 | inline QString hrefOfProperty(const QDomElement &root, const QString &property) { | |
| 149 |
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12 | const QDomElement element = findFirstElementByLocalName(root, property); |
| 150 |
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12 | if (element.isNull()) |
| 151 | 3 | return {}; | |
| 152 |
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9 | return findFirstElementByLocalName(element, QStringLiteral("href")).text().trimmed(); |
| 153 | 12 | } | |
| 154 | |||
| 155 | /// RFC 3744: a collection without write, write-content or all privilege is | ||
| 156 | /// read-only; servers that do not report privileges stay writable | ||
| 157 | /// (Sprint 93 S93.5.8, shared with CardDAV in Sprint 97). | ||
| 158 | 312 | inline bool readOnlyFromPrivileges(const QDomElement &response) { | |
| 159 |
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312 | const QDomElement privileges = findFirstElementByLocalName(response, QStringLiteral("current-user-privilege-set")); |
| 160 |
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361 | if (privileges.isNull() || findFirstElementByLocalName(privileges, QStringLiteral("privilege")).isNull()) |
| 161 | 263 | return false; | |
| 162 |
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98 | return findFirstElementByLocalName(privileges, QStringLiteral("write")).isNull() && |
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157 | findFirstElementByLocalName(privileges, QStringLiteral("write-content")).isNull() && |
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54 | findFirstElementByLocalName(privileges, QStringLiteral("all")).isNull(); |
| 165 | 312 | } | |
| 166 | |||
| 167 | /// RFC 6578 sync-collection answer: the collection-level sync-token and the | ||
| 168 | /// hrefs answered with a response-level 404 (removed since the token). | ||
| 169 | /// Changed members are read by the caller (they carry a propstat). | ||
| 170 | 52 | inline bool parseSyncCollectionStatus(const QByteArray &xml, QStringList *removed, QString *token) { | |
| 171 |
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52 | QDomDocument doc; |
| 172 |
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52 | if (!parseInto(doc, xml)) |
| 173 | 1 | return false; | |
| 174 |
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51 | const QDomElement root = doc.documentElement(); |
| 175 |
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5420 | for (QDomNode node = root.firstChild(); !node.isNull(); node = node.nextSibling()) { |
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5369 | const QDomElement element = node.toElement(); |
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5369 | if (element.localName() == QLatin1String("sync-token") || element.tagName().endsWith(QLatin1String("sync-token"))) |
| 178 |
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50 | *token = element.text().trimmed(); |
| 179 | 5420 | } | |
| 180 |
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51 | const auto responses = findElementsByLocalNameDoc(doc, QStringLiteral("response")); |
| 181 |
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5370 | for (int i = 0; i < responses.count(); ++i) { |
| 182 |
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5319 | const QDomElement response = responses.at(i).toElement(); |
| 183 | // A removed member has a response-level status and no propstat. | ||
| 184 | 5319 | QString status; | |
| 185 |
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15957 | for (QDomNode child = response.firstChild(); !child.isNull(); child = child.nextSibling()) { |
| 186 |
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10638 | const QDomElement element = child.toElement(); |
| 187 |
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10638 | if (localNameOf(element) == QLatin1String("status")) |
| 188 |
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10 | status = element.text(); |
| 189 | 15957 | } | |
| 190 |
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5319 | if (!status.contains(QLatin1String(" 404"))) |
| 191 | 5313 | continue; | |
| 192 |
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6 | const auto hrefs = findElementsByLocalName(response, QStringLiteral("href")); |
| 193 |
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6 | if (!hrefs.isEmpty()) |
| 194 |
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6 | removed->append(hrefs.at(0).toElement().text().trimmed()); |
| 195 | 10632 | } | |
| 196 | 51 | return true; | |
| 197 | 52 | } | |
| 198 | |||
| 199 | } // namespace DavXmlHelper | ||
| 200 |