~singpolyma/biboumi

ref: 0b51e3828116f6847865fae93893eb97a10d1cc2 biboumi/src/xmpp/xmpp_parser.cpp -rw-r--r-- 4.6 KiB
0b51e382 — louiz’ MaxHistoryLength now has some sensible default value if the user set a negative one 4 years ago
                                                                                
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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
#include <xmpp/xmpp_parser.hpp>
#include <xmpp/xmpp_stanza.hpp>

#include <logger/logger.hpp>

/**
 * Expat handlers. Called by the Expat library, never by ourself.
 * They just forward the call to the XmppParser corresponding methods.
 */

static void start_element_handler(void* user_data, const XML_Char* name, const XML_Char** atts)
{
  static_cast<XmppParser*>(user_data)->start_element(name, atts);
}

static void end_element_handler(void* user_data, const XML_Char* name)
{
  static_cast<XmppParser*>(user_data)->end_element(name);
}

static void character_data_handler(void *user_data, const XML_Char *s, int len)
{
  static_cast<XmppParser*>(user_data)->char_data(s, len);
}

/**
 * XmppParser class
 */

XmppParser::XmppParser():
  level(0),
  current_node(nullptr),
  root(nullptr)
{
  this->init_xml_parser();
}

void XmppParser::init_xml_parser()
{
  // Create the expat parser
  this->parser = XML_ParserCreateNS("UTF-8", ':');
  XML_SetUserData(this->parser, static_cast<void*>(this));

  // Install Expat handlers
  XML_SetElementHandler(this->parser, &start_element_handler, &end_element_handler);
  XML_SetCharacterDataHandler(this->parser, &character_data_handler);
}

XmppParser::~XmppParser()
{
  XML_ParserFree(this->parser);
}

int XmppParser::feed(const char* data, const int len, const bool is_final)
{
  int res = XML_Parse(this->parser, data, len, is_final);
  if (res == XML_STATUS_ERROR &&
      (XML_GetErrorCode(this->parser) != XML_ERROR_FINISHED))
    log_error("Xml_Parse encountered an error: ",
              XML_ErrorString(XML_GetErrorCode(this->parser)));
  return res;
}

int XmppParser::parse(const int len, const bool is_final)
{
  int res = XML_ParseBuffer(this->parser, len, is_final);
  if (res == XML_STATUS_ERROR)
    log_error("Xml_Parsebuffer encountered an error: ",
              XML_ErrorString(XML_GetErrorCode(this->parser)));
  return res;
}

void XmppParser::reset()
{
  XML_ParserFree(this->parser);
  this->init_xml_parser();
  this->current_node = nullptr;
  this->root.reset(nullptr);
  this->level = 0;
}

void* XmppParser::get_buffer(const size_t size) const
{
  return XML_GetBuffer(this->parser, static_cast<int>(size));
}

void XmppParser::start_element(const XML_Char* name, const XML_Char** attribute)
{
  this->level++;

  auto new_node = std::make_unique<XmlNode>(name, this->current_node);
  auto new_node_ptr = new_node.get();
  if (this->current_node)
    this->current_node->add_child(std::move(new_node));
  else
    this->root = std::move(new_node);
  this->current_node = new_node_ptr;
  for (size_t i = 0; attribute[i]; i += 2)
    this->current_node->set_attribute(attribute[i], attribute[i+1]);
  if (this->level == 1)
    this->stream_open_event(*this->current_node);
}

void XmppParser::end_element(const XML_Char*)
{
  this->level--;
  if (this->level == 0)
    { // End of the whole stream
      this->stream_close_event(*this->current_node);
      this->current_node = nullptr;
      this->root.reset();
    }
  else
    {
      auto parent = this->current_node->get_parent();
      if (this->level == 1)
        { // End of a stanza
          this->stanza_event(*this->current_node);
          // Note: deleting all the children of our parent deletes ourself,
          // so current_node is an invalid pointer after this line
          parent->delete_all_children();
        }
      this->current_node = parent;
    }
}

void XmppParser::char_data(const XML_Char* data, const size_t len)
{
  if (this->current_node->has_children())
    this->current_node->get_last_child()->add_to_tail({data, len});
  else
    this->current_node->add_to_inner({data, len});
}

void XmppParser::stanza_event(const Stanza& stanza) const
{
  for (const auto& callback: this->stanza_callbacks)
    {
      try {
        callback(stanza);
      } catch (const std::exception& e) {
        log_error("Unhandled exception: ", e.what());
      }
    }
}

void XmppParser::stream_open_event(const XmlNode& node) const
{
  for (const auto& callback: this->stream_open_callbacks)
    callback(node);
}

void XmppParser::stream_close_event(const XmlNode& node) const
{
  for (const auto& callback: this->stream_close_callbacks)
    callback(node);
}

void XmppParser::add_stanza_callback(std::function<void(const Stanza&)>&& callback)
{
  this->stanza_callbacks.emplace_back(std::move(callback));
}

void XmppParser::add_stream_open_callback(std::function<void(const XmlNode&)>&& callback)
{
  this->stream_open_callbacks.emplace_back(std::move(callback));
}

void XmppParser::add_stream_close_callback(std::function<void(const XmlNode&)>&& callback)
{
  this->stream_close_callbacks.emplace_back(std::move(callback));
}