Use native libpurple HTTP functions

.gitlab-ci.yml

@@ -16,7 +16,7 @@ Debian 9:
     - cd vendor && tar -xvzf deltachat-core-0.41.0.tar.gz && cd deltachat-core-0.41.0 && mkdir builddir && cd builddir && meson && ninja && ninja install && cd ../../..
     - cp /usr/local/lib/x86_64-linux-gnu/libdeltachat.so libdeltachat.so
     # purple-plugin-delta
-    - apt install --no-install-recommends -t stretch-backports -yy libpurple-dev libcurl4-openssl-dev libglib2.0-dev
+    - apt install --no-install-recommends -t stretch-backports -yy libpurple-dev libglib2.0-dev
     - make
   artifacts:
     paths:

Makefile

@@ -11,11 +11,11 @@ $(LIB_TARGET): *.c *.h Makefile
 		-std=c11 \
 		-shared \
 		-fpic \
-		$(shell $(PKG_CONFIG) --cflags purple libcurl deltachat) \
+		$(shell $(PKG_CONFIG) --cflags purple deltachat) \
 		-o $(LIB_TARGET) \
 		*.c \
 		-shared \
-		$(shell $(PKG_CONFIG) --libs purple libcurl deltachat) \
+		$(shell $(PKG_CONFIG) --libs purple deltachat) \
 
 install:
 	install -D $(LIB_TARGET) $(LIB_DEST)

README.md

@@ -19,7 +19,7 @@ you'll need to build and install it according to
 Now, you'll need some other build dependencies:
 
 ```
-sudo apt install build-essential libpurple-dev libcurl4-openssl-dev libglib2.0-dev
+sudo apt install build-essential libpurple-dev libglib2.0-dev
 ```
 
 Finally, run `make` to create a `libdelta.so` file.

delta-connection.c

@@ -5,9 +5,6 @@
 #include <string.h>
 #include <pthread.h>
 
-#include <curl/curl.h>
-#include <curl/easy.h>
-
 #include "delta-connection.h"
 #include "libdelta.h"
 #include "util.h"
@@ -76,78 +73,6 @@ _transpose_config(dc_context_t *mailbox, PurpleAccount *acct)
 	dc_set_config(mailbox, PLUGIN_ACCOUNT_OPT_SMTP_SERVER_PORT, smtp_port);
 }
 
-// This and WriteMemoryCallback are "borrowed" from https://curl.haxx.se/libcurl/c/getinmemory.html
-struct MemoryStruct {
-	char *memory;
-	size_t size;
-};
-
-static size_t
-WriteMemoryCallback(void *contents, size_t size, size_t nmemb, void *userp)
-{
-	size_t realsize = size * nmemb;
-	struct MemoryStruct *mem = (struct MemoryStruct *)userp;
-
-	mem->memory = realloc(mem->memory, mem->size + realsize + 1);
-	if(mem->memory == NULL) {
-		printf("not enough memory (realloc returned NULL)\n");
-		return 0;
-	}
-
-	memcpy(&(mem->memory[mem->size]), contents, realsize);
-	mem->size += realsize;
-	mem->memory[mem->size] = 0;
-
-	return realsize;
-}
-
-uintptr_t
-_http_get(const char *url)
-{
-	long status = 0;
-	uintptr_t out = 0;
-	CURL *curl = curl_easy_init();
-	CURLcode res;
-
-	if (curl == NULL) {
-		return 0;
-	}
-
-	struct MemoryStruct chunk;
-	chunk.memory = malloc(1);  /* will be grown as needed by the realloc above */
-	chunk.size = 0;    /* no data at this point */
-
-	curl_easy_setopt(curl, CURLOPT_URL, url);
-	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
-	curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&chunk);
-
-	res = curl_easy_perform(curl);
-	if (res != CURLE_OK) {
-		printf("Failed to GET %s: %s\n", url, curl_easy_strerror(res));
-		goto err;
-	}
-
-	res = curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &status);
-	if (res != CURLE_OK) {
-		printf("Failed to read response code for %s: %s\n", url, curl_easy_strerror(res));
-		goto err;
-	}
-
-	if (status < 200 || status > 299) {
-		printf("Non-success HTTP response code for %s: %lu\n", url, status);
-		goto err;
-	}
-
-	out = (uintptr_t)chunk.memory;
-
-err:
-	curl_easy_cleanup(curl);
-
-	// Don't free chunk.memory - that will be done by deltachat-core
-
-	return out;
-}
-
 typedef struct {
 	DeltaConnectionData *conn;
 
@@ -156,6 +81,11 @@ typedef struct {
 
 	// Used by delta_process_connection_state
 	int connection_state;
+
+	// Used by delta_process_http_get
+	char *http_url;
+	char *http_response;
+	pthread_cond_t *http_wait;
 } ProcessRequest;
 
 gboolean
@@ -218,8 +148,71 @@ delta_process_fresh_messages(void *data)
 	return FALSE;
 }
 
-// Do not call any libpurple functions in here, as it is not thread-safe and
-// events may be dispatched from any delta thread. Use
+void
+delta_process_http_get_cb(
+	PurpleUtilFetchUrlData *url_data,
+	gpointer user_data,
+	const gchar *url_text,
+	gsize len,
+	const gchar *error_message
+)
+{
+	UNUSED(url_data);
+
+	ProcessRequest *pr = (ProcessRequest *)user_data;
+	g_assert(pr != NULL);
+	g_assert(pr->http_wait != NULL);
+
+	if (len == 0) {
+		printf("Failed to GET %s: %s\n", pr->http_url, error_message);
+		pr->http_response = NULL;
+		goto out;
+	}
+
+	pr->http_response = g_malloc(len);
+	g_assert(pr->http_response != NULL);
+
+	strncpy(pr->http_response, url_text, len);
+
+out:
+	pthread_cond_broadcast(pr->http_wait);
+	return;
+}
+
+gboolean
+delta_process_http_get(void *data)
+{
+	ProcessRequest *pr = (ProcessRequest *)data;
+	g_assert(pr != NULL);
+	g_assert(pr->http_url != NULL);
+
+	purple_util_fetch_url(
+		pr->http_url,
+		TRUE,
+		NULL,
+		TRUE,
+		delta_process_http_get_cb,
+		data
+	);
+
+	return FALSE;
+}
+
+ProcessRequest *
+delta_build_process_request(DeltaConnectionData *conn)
+{
+	g_assert(conn != NULL);
+
+	ProcessRequest *pr = g_malloc(sizeof(ProcessRequest));
+	g_assert(pr != NULL);
+
+	pr->conn = conn;
+
+	return pr;
+}
+
+// Do not call any libpurple or delta functions in here, as it is not
+// thread-safe and events may be dispatched from any delta thread. Use
 // purple_timeout_add(0, callback, data) to run on the main thread instead
 uintptr_t
 my_delta_handler(dc_context_t* mailbox, int event, uintptr_t data1, uintptr_t data2)
@@ -227,8 +220,10 @@ my_delta_handler(dc_context_t* mailbox, int event, uintptr_t data1, uintptr_t da
 	DeltaConnectionData *conn = (DeltaConnectionData *)dc_get_userdata(mailbox);
 	g_assert(conn != NULL);
 
-	ProcessRequest *pr;
+	ProcessRequest *pr = NULL;
 	uintptr_t out = 0;
+	pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+	pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
 
 	printf("my_delta_handler(mailbox, %d, %lu, %lu)\n", event, data1, data2);
 
@@ -248,20 +243,14 @@ my_delta_handler(dc_context_t* mailbox, int event, uintptr_t data1, uintptr_t da
 		break;
 
 	case DC_EVENT_MSGS_CHANGED:
-		pr = g_malloc(sizeof(ProcessRequest));
-		g_assert(pr != NULL);
-
-		pr->conn = conn;
+		pr = delta_build_process_request(conn);
 		purple_timeout_add(0, delta_process_fresh_messages, pr);
 		break;
 
 	case DC_EVENT_INCOMING_MSG:
 		// data1 is chat_id, which we don't seem to need yet.
 		// TODO: It may be needed for group chats
-		pr = g_malloc(sizeof(ProcessRequest));
-		g_assert(pr != NULL);
-
-		pr->conn = conn;
+		pr = delta_build_process_request(conn);
 		pr->msg_id = (uint32_t)data2;
 		purple_timeout_add(0, delta_process_incoming_message, pr);
 		break;
@@ -276,16 +265,34 @@ my_delta_handler(dc_context_t* mailbox, int event, uintptr_t data1, uintptr_t da
 		break;
 
 	case DC_EVENT_CONFIGURE_PROGRESS:
-		pr = g_malloc(sizeof(ProcessRequest));
-		g_assert(pr != NULL);
-
-		pr->conn = conn;
+		pr = delta_build_process_request(conn);
 		pr->connection_state = (int)data1;
 		purple_timeout_add(0, delta_process_connection_state, pr);
 		break;
+
 	case DC_EVENT_HTTP_GET:
 		printf("HTTP GET requested: %s\n", (char *)data1);
-		out = _http_get((char *)data1);
+
+		pthread_mutex_lock(&mutex);
+
+		pr = delta_build_process_request(conn);
+		g_assert(pr != NULL);
+
+		pr->http_url = (char *)data1;
+		pr->http_wait = &cond;
+
+		purple_timeout_add(0, delta_process_http_get, pr);
+
+		// Wait patiently for the HTTP GET to complete
+		pthread_cond_wait(pr->http_wait, &mutex);
+		out = (uintptr_t)pr->http_response;
+
+		pthread_mutex_unlock(&mutex);
+
+		pthread_cond_destroy(&cond);
+		pthread_mutex_destroy(&mutex);
+		free(pr);
+
 		break;
 	case DC_EVENT_IS_OFFLINE:
 		if ( conn->pc == NULL || !PURPLE_CONNECTION_IS_CONNECTED(conn->pc) ) {