[ADD/WIP] Add some HTTP request code

We can now *register* users!

src/AS.c

@@ -0,0 +1,56 @@
+#include <AS.h>
+
+#include <Cytoplasm/Memory.h>
+#include <Cytoplasm/Str.h>
+#include <Cytoplasm/Log.h>
+
+#include <string.h>
+
+#include <Matrix.h>
+
+HashMap *
+ASVerifyRequest(ParseeHttpArg *arg)
+{
+    HashMap *ret = NULL;
+    HashMap *params;
+    char *authorisation;
+    if (!arg)
+    {
+        return NULL;
+    }
+
+    params = HttpRequestHeaders(arg->ctx);
+    authorisation = HashMapGet(params, "authorization");
+
+    if (!authorisation || strncmp(authorisation, "Bearer ", 7))
+    {
+        Log(LOG_INFO, "Bad auth %s", authorisation);
+        HttpResponseStatus(arg->ctx, HTTP_FORBIDDEN);
+        ret = MatrixCreateError("M_MISSING_TOKEN", "No 'hs_token' given in.");
+        goto end;
+    }
+
+    authorisation += 7;
+    if (!StrEquals(authorisation, arg->data->config->hs_token))
+    {
+        HttpResponseStatus(arg->ctx, HTTP_FORBIDDEN);
+        ret = MatrixCreateError("M_FORBIDDEN","Incorrect authorisation given");
+        goto end;
+    }
+end:
+    return ret;
+}
+
+void
+ASAuthenticateRequest(ParseeConfig *data, HttpClientContext *ctx)
+{
+    char *bearer;
+    if (!data || !ctx)
+    {
+        return;
+    }
+
+    bearer = StrConcat(2, "Bearer ", data->as_token);
+    HttpRequestHeader(ctx, "Authorization", bearer);
+    Free(bearer);
+}