1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
#include "http_request.hpp"
#include "http_file_source.hpp"
#include <mbgl/storage/response.hpp>
#include <mbgl/util/chrono.hpp>
#include <mbgl/util/optional.hpp>
#include <mbgl/util/http_header.hpp>
#include <mbgl/util/string.hpp>
#include <mbgl/util/version.hpp>
#include <QByteArray>
#include <QNetworkReply>
#include <QPair>
namespace mbgl {
HTTPRequest::HTTPRequest(HTTPFileSource::Impl* context, const Resource& resource, FileSource::Callback callback)
: m_context(context)
, m_resource(resource)
, m_callback(callback)
{
m_context->request(this);
}
HTTPRequest::~HTTPRequest()
{
if (!m_handled) {
m_context->cancel(this);
}
}
QUrl HTTPRequest::requestUrl() const
{
return QUrl::fromPercentEncoding(QByteArray(m_resource.url.data(), m_resource.url.size()));
}
QNetworkRequest HTTPRequest::networkRequest() const
{
QNetworkRequest req = QNetworkRequest(requestUrl());
req.setAttribute(QNetworkRequest::CacheLoadControlAttribute, QNetworkRequest::PreferCache);
static const QByteArray agent = QString("MapboxGL/%1 (Qt %2)").arg(version::revision).arg(QT_VERSION_STR).toLatin1();
req.setRawHeader("User-Agent", agent);
if (m_resource.priorEtag) {
const auto etag = m_resource.priorEtag;
req.setRawHeader("If-None-Match", QByteArray(etag->data(), etag->size()));
} else if (m_resource.priorModified) {
req.setRawHeader("If-Modified-Since", util::rfc1123(*m_resource.priorModified).c_str());
}
return req;
}
void HTTPRequest::handleNetworkReply(QNetworkReply *reply)
{
m_handled = true;
// Calling `callback` may result in deleting `this`.
// Copy data to temporaries first.
auto callback = m_callback;
mbgl::Response response;
using Error = Response::Error;
// Handle non-HTTP errors (i.e. like connection).
if (reply->error() && reply->error() < 100) {
response.error = std::make_unique<Error>(
Error::Reason::Connection, reply->errorString().toStdString());
callback(response);
return;
}
QPair<QByteArray, QByteArray> line;
optional<std::string> retryAfter;
optional<std::string> xRateLimitReset;
foreach(line, reply->rawHeaderPairs()) {
QString header = QString(line.first).toLower();
if (header == "last-modified") {
response.modified = util::parseTimestamp(line.second.constData());
} else if (header == "etag") {
response.etag = std::string(line.second.constData(), line.second.size());
} else if (header == "cache-control") {
const auto cc = http::CacheControl::parse(line.second.constData());
response.expires = cc.toTimePoint();
response.mustRevalidate = cc.mustRevalidate;
} else if (header == "expires") {
response.expires = util::parseTimestamp(line.second.constData());
} else if (header == "retry-after") {
retryAfter = std::string(line.second.constData(), line.second.size());
} else if (header == "x-rate-limit-reset") {
xRateLimitReset = std::string(line.second.constData(), line.second.size());
}
}
int responseCode = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
switch(responseCode) {
case 200: {
QByteArray bytes = reply->readAll();
if (bytes.isEmpty()) {
response.data = std::make_shared<std::string>();
} else {
response.data = std::make_shared<std::string>(bytes.constData(), bytes.size());
}
break;
}
case 204:
response.noContent = true;
break;
case 304:
response.notModified = true;
break;
case 404: {
if (m_resource.kind == Resource::Kind::Tile) {
response.noContent = true;
} else {
response.error = std::make_unique<Error>(
Error::Reason::NotFound, "HTTP status code 404");
}
break;
}
case 429:
response.error = std::make_unique<Error>(
Error::Reason::RateLimit, "HTTP status code 429",
http::parseRetryHeaders(retryAfter, xRateLimitReset));
break;
default:
Response::Error::Reason reason = (responseCode >= 500 && responseCode < 600) ?
Error::Reason::Server : Error::Reason::Other;
response.error = std::make_unique<Error>(
reason, "HTTP status code " + util::toString(responseCode));
}
callback(response);
}
} // namespace mbgl
|
