Added form POSTing and HTTP error code handling to Webternet (bug 3530, r=pred).

extensions/curl/curlapi.cpp

@@ -2,6 +2,32 @@
 
 Webternet g_webternet;
 
+WebForm::WebForm() : first(NULL), last(NULL), lastError(CURL_FORMADD_OK)
+{
+}
+
+bool WebForm::AddString(const char *name, const char *data)
+{
+	lastError = curl_formadd(&first,
+		&last,
+		CURLFORM_COPYNAME,
+		name,
+		CURLFORM_COPYCONTENTS,
+		data,
+		CURLFORM_END);
+	return lastError == CURL_FORMADD_OK;
+}
+
+curl_httppost *WebForm::GetFormData()
+{
+	return first;
+}
+
+WebForm::~WebForm()
+{
+	curl_formfree(first);
+}
+
 WebTransfer *WebTransfer::CreateWebSession()
 {
 	CURL *curl;
@@ -46,6 +72,12 @@ bool WebTransfer::SetHeaderReturn(bool recv_hdr)
 	return lastError == 0;
 }
 
+bool WebTransfer::SetFailOnHTTPError(bool fail)
+{
+	lastError = curl_easy_setopt(curl, CURLOPT_FAILONERROR, fail ? 1 : 0);
+	return lastError == 0;
+}
+
 static size_t curl_write_to_sm(void *ptr, size_t bytes, size_t nmemb, void *stream)
 {
 	void **userdata = (void **)stream;
@@ -81,6 +113,52 @@ bool WebTransfer::Download(const char *url, ITransferHandler *handler, void *dat
 		return false;
 	}
 
+	lastError = curl_easy_setopt(curl, CURLOPT_HTTPPOST, NULL);
+	if (lastError)
+	{
+		return false;
+	}
+
+	lastError = curl_easy_setopt(curl, CURLOPT_URL, url);
+	if (lastError)
+	{
+		return false;
+	}
+
+	lastError = curl_easy_perform(curl);
+	
+	return (lastError == 0);
+}
+
+bool WebTransfer::PostAndDownload(const char *url,
+								  IWebForm *form,
+								  ITransferHandler *handler,
+								  void *data)
+{
+	WebForm *realform = (WebForm*)form;
+
+	lastError = curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_write_to_sm);
+	if (lastError)
+	{
+		return false;
+	}
+
+	void *userdata[3];
+	userdata[0] = this;
+	userdata[1] = handler;
+	userdata[2] = data;
+	lastError = curl_easy_setopt(curl, CURLOPT_WRITEDATA, userdata);
+	if (lastError)
+	{
+		return false;
+	}
+
+	lastError = curl_easy_setopt(curl, CURLOPT_HTTPPOST, realform->GetFormData());
+	if (lastError)
+	{
+		return false;
+	}
+
 	lastError = curl_easy_setopt(curl, CURLOPT_URL, url);
 	if (lastError)
 	{
@@ -112,3 +190,7 @@ IWebTransfer *Webternet::CreateSession()
 	return WebTransfer::CreateWebSession();
 }
 
+IWebForm *Webternet::CreateForm()
+{
+	return new WebForm();
+}

extensions/curl/curlapi.h

@@ -37,6 +37,21 @@
 
 using namespace SourceMod;
 
+class WebForm : public IWebForm
+{
+public:
+	WebForm();
+	~WebForm();
+public:
+	bool AddString(const char *name, const char *data);
+public:
+	curl_httppost *GetFormData();
+private:
+	curl_httppost *first;
+	curl_httppost *last;
+	CURLFORMcode lastError;
+};
+
 class WebTransfer : public IWebTransfer
 {
 public:
@@ -48,6 +63,11 @@ public:
 	int LastErrorCode();
 	bool SetHeaderReturn(bool recv_hdr);
 	bool Download(const char *url, ITransferHandler *handler, void *data);
+	bool SetFailOnHTTPError(bool fail);
+	bool PostAndDownload(const char *url,
+		IWebForm *form,
+		ITransferHandler *handler,
+		void *data);
 private:
 	CURL *curl;
 	char errorBuffer[CURL_ERROR_SIZE];
@@ -61,6 +81,7 @@ public:
 	const char *GetInterfaceName();
 public:
 	IWebTransfer *CreateSession();
+	IWebForm *CreateForm();
 };
 
 extern Webternet g_webternet;

public/extensions/IWebternet.h

@@ -40,7 +40,7 @@
  */
 
 #define SMINTERFACE_WEBTERNET_NAME		"IWebternet"
-#define SMINTERFACE_WEBTERNET_VERSION	1
+#define SMINTERFACE_WEBTERNET_VERSION	3
 
 namespace SourceMod
 {
@@ -56,6 +56,31 @@ namespace SourceMod
 	class IWebTransfer;
 	class IWebternet;
 
+	/**
+	 * @brief Form for POSTing data.
+	 */
+	class IWebForm
+	{
+	public:
+		/**
+		 * @brief Free with delete.
+		 */
+		virtual ~IWebForm()
+		{
+		}
+	public:
+		/**
+		 * @brief Adds raw data to the form.
+		 *
+		 * All data is copied locally and may go out of scope.
+		 *
+		 * @param name				Field name (null terminated).
+		 * @param data				Field data (null terminated).
+		 * @return					True on success, false on failure.
+		 */
+		virtual bool AddString(const char *name, const char *data) = 0;
+	};
+
 	/**
 	 * @brief Transfer handler interface.
 	 */
@@ -139,6 +164,30 @@ namespace SourceMod
 		 * @return					True on success, false on failure.
 		 */
 		virtual bool Download(const char *url, ITransferHandler *handler, void *data) = 0;
+
+		/**
+		 * @brief Downloads a URL with POST options.
+		 *
+		 * @param url				URL to download.
+		 * @param form				Form to read POST info from.
+		 * @param handler			Handler object.
+		 * @param userdata			User data pointer.
+		 * @return					True on success, false on failure.
+		 */
+		virtual bool PostAndDownload(const char *url,
+			IWebForm *form,
+			ITransferHandler *handler,
+			void *data) = 0;
+
+		/**
+		 * @brief Sets whether an HTTP failure (>= 400) returns false from Download().
+		 *
+		 * Note: defaults to false.
+		 *
+		 * @param fail				True to fail, false otherwise.
+		 * @return					True on success, false otherwise.
+		 */
+		virtual bool SetFailOnHTTPError(bool fail) = 0;
 	};
 
 	/**
@@ -156,6 +205,13 @@ namespace SourceMod
 		 * @return				Object, or NULL on failure.
 		 */
 		virtual IWebTransfer *CreateSession() = 0;
+
+		/**
+		 * @brief Creates a form for building POST data.
+		 *
+		 * @return				New form, or NULL on failure.
+		 */
+		virtual IWebForm *CreateForm() = 0;
 	};
 }