[ADD/WIP] Bridge media Matrix->XMPP

We're on that Reverse Ideology phase.

src/Routes/Media.c

@@ -0,0 +1,49 @@
+#include <Routes.h>
+
+#include <Cytoplasm/Memory.h>
+#include <Cytoplasm/Str.h>
+
+#include <Matrix.h>
+#include <Parsee.h>
+#include <AS.h>
+
+RouteHead(RouteMedia, arr, argp)
+{
+    ParseeHttpArg *args = argp;
+    HttpClientContext *cctx;
+    HashMap *reqh;
+    char *server = ArrayGet(arr, 0);
+    char *identi = ArrayGet(arr, 1);
+    char *path, *key, *val;
+
+    /* TODO: Make it check the DB for its validicity. "Purging" would be useful.
+     */
+    if (!server || !identi)
+    {
+        HttpResponseStatus(args->ctx, HTTP_BAD_REQUEST);
+        return MatrixCreateError("M_NOT_YET_UPLOADED", "No server/identifier");
+    }
+    
+    server = HttpUrlEncode(server);
+    identi = HttpUrlEncode(identi);
+    path = StrConcat(4, "/_matrix/media/v3/download/", server, "/", identi);
+    cctx = ParseeCreateRequest(args->data->config, HTTP_GET, path);
+    ASAuthenticateRequest(args->data->config, cctx);
+    Free(path);
+
+    HttpRequestSendHeaders(cctx);
+    HttpRequestSend(cctx);
+    reqh = HttpResponseHeaders(cctx);
+    while (HashMapIterate(reqh, &key, (void **) &val))
+    {
+        HttpResponseHeader(args->ctx, key, val);
+    }
+    HttpSendHeaders(args->ctx);
+    StreamCopy(HttpClientStream(cctx), HttpServerStream(args->ctx));
+
+    HttpClientContextFree(cctx);
+    Free(server);
+    Free(identi);
+
+    return NULL;
+}