129 lines
3.8 KiB
Dart
129 lines
3.8 KiB
Dart
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part of angel_framework.http;
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/// A function that asynchronously generates a view from the given path and data.
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typedef Future<String> ViewGenerator(String path, {Map data});
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/// A convenience wrapper around an outgoing HTTP request.
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class ResponseContext {
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/// The [Angel] instance that is sending a response.
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Angel app;
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God god = new God();
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/// Can we still write to this response?
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bool isOpen = true;
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/// A set of UTF-8 encoded bytes that will be written to the response.
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List<List<int>> responseData = [];
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/// Sets the status code to be sent with this response.
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status(int code) {
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underlyingResponse.statusCode = code;
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}
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/// The underlying [HttpResponse] under this instance.
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HttpResponse underlyingResponse;
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ResponseContext(this.underlyingResponse);
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/// Any and all cookies to be sent to the user.
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List<Cookie> get cookies => underlyingResponse.cookies;
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/// Set this to true if you will manually close the response.
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bool willCloseItself = false;
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/// Sends a download as a response.
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download(File file, {String filename}) {
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header("Content-Disposition",
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'Content-Disposition: attachment; filename="${filename ?? file.path}"');
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header(HttpHeaders.CONTENT_TYPE, lookupMimeType(file.path));
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header(HttpHeaders.CONTENT_LENGTH, file.lengthSync().toString());
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responseData.add(file.readAsBytesSync());
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}
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/// Prevents more data from being written to the response.
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end() => isOpen = false;
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/// Sets a response header to the given value, or retrieves its value.
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header(String key, [String value]) {
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if (value == null) return underlyingResponse.headers[key];
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else underlyingResponse.headers.set(key, value);
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}
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/// Serializes JSON to the response.
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json(value) {
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write(god.serialize(value));
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header(HttpHeaders.CONTENT_TYPE, ContentType.JSON.toString());
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end();
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}
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/// Returns a JSONP response.
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jsonp(value, {String callbackName: "callback"}) {
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write("$callbackName(${god.serialize(value)})");
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header(HttpHeaders.CONTENT_TYPE, "application/javascript");
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end();
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}
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/// Renders a view to the response stream, and closes the response.
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Future render(String view, {Map data}) async {
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/// TODO: app.viewGenerator
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var generator = app.viewGenerator(view, data: data);
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write(await generator);
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header(HttpHeaders.CONTENT_TYPE, ContentType.HTML.toString());
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end();
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}
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/// Redirects to user to the given URL.
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redirect(String url, {int code: 301}) {
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header(HttpHeaders.LOCATION, url);
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status(code);
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write('''
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<!DOCTYPE html>
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<html>
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<head>
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<title>Redirecting...</title>
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<meta http-equiv="refresh" content="0; url=$url">
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</head>
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<body>
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<h1>Currently redirecting you...</h1>
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<br />
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Click <a href="$url"></a> if you are not automatically redirected...
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<script>
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window.location = "$url";
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</script>
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</body>
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</html>
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''');
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end();
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}
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/// Streams a file to this response as chunked data.
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///
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/// Useful for video sites.
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streamFile(File file,
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{int chunkSize, int sleepMs: 0, bool resumable: true}) async {
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if (!isOpen) return;
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header(HttpHeaders.CONTENT_TYPE, lookupMimeType(file.path));
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willCloseItself = true;
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await file.openRead().pipe(underlyingResponse);
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/*await chunked(file.openRead(), chunkSize: chunkSize,
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sleepMs: sleepMs,
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resumable: resumable);*/
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}
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/// Writes data to the response.
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write(value) {
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if (isOpen)
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responseData.add(UTF8.encode(value.toString()));
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}
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/// Magically transforms an [HttpResponse] object into a ResponseContext.
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static Future<ResponseContext> from
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(HttpResponse response, Angel app) async
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{
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ResponseContext context = new ResponseContext(response);
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context.app = app;
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return context;
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}
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}
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