Move urlhandlers out of skiaserve.cpp

tools/skiaserve/urlhandlers/PostHandler.cpp

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "UrlHandler.h"
+
+#include "microhttpd.h"
+#include "../Request.h"
+#include "../Response.h"
+
+using namespace Response;
+
+static const size_t kBufferSize = 1024;
+
+static int process_upload_data(void* cls, enum MHD_ValueKind kind,
+                               const char* key, const char* filename,
+                               const char* content_type, const char* transfer_encoding,
+                               const char* data, uint64_t off, size_t size) {
+    struct UploadContext* uc = reinterpret_cast<UploadContext*>(cls);
+
+    if (0 != size) {
+        uc->fStream.write(data, size);
+    }
+    return MHD_YES;
+}
+
+bool PostHandler::canHandle(const char* method, const char* url) {
+    return 0 == strcmp(method, MHD_HTTP_METHOD_POST) &&
+           0 == strcmp(url, "/new");
+}
+
+int PostHandler::handle(Request* request, MHD_Connection* connection,
+                        const char* url, const char* method,
+                        const char* upload_data, size_t* upload_data_size) {
+    UploadContext* uc =  request->fUploadContext;
+
+    // New connection
+    if (!uc) {
+        // TODO make this a method on request
+        uc = new UploadContext;
+        uc->connection = connection;
+        uc->fPostProcessor = MHD_create_post_processor(connection, kBufferSize,
+                                                       &process_upload_data, uc);
+        SkASSERT(uc->fPostProcessor);
+
+        request->fUploadContext = uc;
+        return MHD_YES;
+    }
+
+    // in process upload
+    if (0 != *upload_data_size) {
+        SkASSERT(uc->fPostProcessor);
+        MHD_post_process(uc->fPostProcessor, upload_data, *upload_data_size);
+        *upload_data_size = 0;
+        return MHD_YES;
+    }
+
+    // end of upload
+    MHD_destroy_post_processor(uc->fPostProcessor);
+    uc->fPostProcessor = nullptr;
+
+    // parse picture from stream
+    request->fPicture.reset(
+        SkPicture::CreateFromStream(request->fUploadContext->fStream.detachAsStream()));
+    if (!request->fPicture.get()) {
+        fprintf(stderr, "Could not create picture from stream.\n");
+        return MHD_NO;
+    }
+
+    // pour picture into debug canvas
+    request->fDebugCanvas.reset(new SkDebugCanvas(Request::kImageWidth,
+                                                  Request::kImageHeight));
+    request->fDebugCanvas->drawPicture(request->fPicture);
+
+    // clear upload context
+    delete request->fUploadContext;
+    request->fUploadContext = nullptr;
+
+    return SendTemplate(connection, true, "/");
+}
+