Implement XEP-0448: Stateless File Sharing

This adds a file sharing manager that is capable of using multiple back
ends. Currently implemented are a normal HTTP File Upload backend and an
encrypted HTTP File Upload. Jingle File Transfer could be implemented
later.

Co-authored-by: Linus Jahn <lnj@kaidan.im>

4 files changed, 45 insertions, 0 deletions

diff --git a/src/base/QXmppFileShare.cpp b/src/base/QXmppFileShare.cpp
index 9dd4b686..28276b0c 100644
--- a/src/base/QXmppFileShare.cpp
+++ b/src/base/QXmppFileShare.cpp
@@ -125,6 +125,29 @@ void QXmppFileShare::setEncryptedSourecs(const QVector<QXmppEncryptedFileSource>
 }
 
 /// \cond
+void QXmppFileShare::visitSources(std::function<bool(const std::any &)> &&visitor) const
+{
+    for (const auto &httpSource : d->httpSources) {
+        if (visitor(httpSource)) {
+            return;
+        }
+    }
+    for (const auto &encryptedSource : d->encryptedSources) {
+        if (visitor(encryptedSource)) {
+            return;
+        }
+    }
+}
+
+void QXmppFileShare::addSource(const std::any &source)
+{
+    if (source.type() == typeid(QXmppHttpFileSource)) {
+        d->httpSources.push_back(std::any_cast<QXmppHttpFileSource>(source));
+    } else if (source.type() == typeid(QXmppEncryptedFileSource)) {
+        d->encryptedSources.push_back(std::any_cast<QXmppEncryptedFileSource>(source));
+    }
+}
+
 bool QXmppFileShare::parse(const QDomElement &el)
 {
     if (el.tagName() == "file-sharing" && el.namespaceURI() == ns_sfs) {
diff --git a/src/base/QXmppFileShare.h b/src/base/QXmppFileShare.h
index b0d48bd3..b8506836 100644
--- a/src/base/QXmppFileShare.h
+++ b/src/base/QXmppFileShare.h
@@ -7,6 +7,9 @@
 
 #include "QXmppGlobal.h"
 
+#include <any>
+#include <functional>
+
 #include <QSharedDataPointer>
 
 class QDomElement;
@@ -43,6 +46,13 @@ public:
     /// \cond
     bool parse(const QDomElement &el);
     void toXml(QXmlStreamWriter *writer) const;
+
+protected:
+    friend class QXmppFileSharingManager;
+
+    // Private, internally used API:
+    void visitSources(std::function<bool(const std::any &)> &&visitor) const;
+    void addSource(const std::any &source);
     /// \endcond
 
 private:
diff --git a/src/base/QXmppUtils.cpp b/src/base/QXmppUtils.cpp
index 7ae74ba3..e0225d77 100644
--- a/src/base/QXmppUtils.cpp
+++ b/src/base/QXmppUtils.cpp
@@ -403,4 +403,15 @@ void QXmpp::Private::generateRandomBytes(uint8_t *bytes, uint32_t byteCount)
 #endif
 }
 
+float QXmpp::Private::calculateProgress(qint64 transferred, qint64 total)
+{
+    if (total > 0) {
+        if (transferred > total) {
+            return 1;
+        }
+        return float(transferred) / total;
+    }
+
+    return 0;
+}
 /// \endcond
diff --git a/src/base/QXmppUtils_p.h b/src/base/QXmppUtils_p.h
index 9a7b6103..17a24634 100644
--- a/src/base/QXmppUtils_p.h
+++ b/src/base/QXmppUtils_p.h
@@ -16,6 +16,7 @@ namespace QXmpp::Private {
 
 QXMPP_EXPORT QByteArray generateRandomBytes(uint32_t minimumByteCount, uint32_t maximumByteCount);
 QXMPP_EXPORT void generateRandomBytes(uint8_t *bytes, uint32_t byteCount);
+float calculateProgress(qint64 transferred, qint64 total);
 
 }  // namespace QXmpp::Private