1 | /***************************************************************************\ |
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2 | * * |
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3 | * BitlBee - An IRC to IM gateway * |
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4 | * libpurple module - File transfer stuff * |
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5 | * * |
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6 | * Copyright 2009-2010 Wilmer van der Gaast <wilmer@gaast.net> * |
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7 | * * |
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8 | * This program is free software; you can redistribute it and/or modify * |
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9 | * it under the terms of the GNU General Public License as published by * |
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10 | * the Free Software Foundation; either version 2 of the License, or * |
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11 | * (at your option) any later version. * |
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12 | * * |
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13 | * This program is distributed in the hope that it will be useful, * |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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16 | * GNU General Public License for more details. * |
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17 | * * |
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18 | * You should have received a copy of the GNU General Public License along * |
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19 | * with this program; if not, write to the Free Software Foundation, Inc., * |
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20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * |
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21 | * * |
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22 | \***************************************************************************/ |
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23 | |
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24 | /* Do file transfers via disk for now, since libpurple was really designed |
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25 | for straight-to/from disk fts and is only just learning how to pass the |
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26 | file contents the the UI instead (2.6.0 and higher it seems, and with |
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27 | varying levels of success). */ |
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28 | |
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29 | #include "bitlbee.h" |
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30 | |
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31 | #include <stdarg.h> |
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32 | |
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33 | #include <glib.h> |
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34 | #include <purple.h> |
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35 | |
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36 | struct prpl_xfer_data |
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37 | { |
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38 | PurpleXfer *xfer; |
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39 | file_transfer_t *ft; |
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40 | int fd; |
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41 | char *fn; |
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42 | gboolean ui_wants_data; |
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43 | }; |
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44 | |
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45 | static file_transfer_t *next_ft; |
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46 | |
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47 | struct im_connection *purple_ic_by_pa( PurpleAccount *pa ); |
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48 | static gboolean prplcb_xfer_new_send_cb( gpointer data, gint fd, b_input_condition cond ); |
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49 | static gboolean prpl_xfer_write_request( struct file_transfer *ft ); |
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50 | |
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51 | |
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52 | /* Receiving files (IM->UI): */ |
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53 | static void prpl_xfer_accept( struct file_transfer *ft ) |
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54 | { |
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55 | struct prpl_xfer_data *px = ft->data; |
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56 | purple_xfer_request_accepted( px->xfer, NULL ); |
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57 | prpl_xfer_write_request( ft ); |
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58 | } |
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59 | |
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60 | static void prpl_xfer_canceled( struct file_transfer *ft, char *reason ) |
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61 | { |
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62 | struct prpl_xfer_data *px = ft->data; |
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63 | purple_xfer_request_denied( px->xfer ); |
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64 | } |
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65 | |
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66 | static void prplcb_xfer_new( PurpleXfer *xfer ) |
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67 | { |
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68 | if( purple_xfer_get_type( xfer ) == PURPLE_XFER_RECEIVE ) |
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69 | { |
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70 | struct prpl_xfer_data *px = g_new0( struct prpl_xfer_data, 1 ); |
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71 | |
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72 | xfer->ui_data = px; |
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73 | px->xfer = xfer; |
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74 | px->fn = mktemp( g_strdup( "/tmp/bitlbee-purple-ft.XXXXXX" ) ); |
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75 | px->fd = -1; |
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76 | |
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77 | purple_xfer_set_local_filename( xfer, px->fn ); |
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78 | |
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79 | /* Sadly the xfer struct is still empty ATM so come back after |
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80 | the caller is done. */ |
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81 | b_timeout_add( 0, prplcb_xfer_new_send_cb, xfer ); |
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82 | } |
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83 | else |
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84 | { |
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85 | /* |
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86 | struct prpl_xfer_data *px = g_new0( struct prpl_xfer_data, 1 ); |
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87 | |
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88 | px->fd = -1; |
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89 | px->ft = next_ft; |
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90 | px->ft->data = px; |
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91 | px->xfer = xfer; |
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92 | px->xfer->ui_data = px; |
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93 | |
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94 | purple_xfer_set_filename( xfer, px->ft->file_name ); |
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95 | purple_xfer_set_size( xfer, px->ft->file_size ); |
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96 | |
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97 | next_ft = NULL; |
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98 | */ |
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99 | } |
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100 | } |
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101 | |
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102 | static gboolean prplcb_xfer_new_send_cb( gpointer data, gint fd, b_input_condition cond ) |
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103 | { |
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104 | PurpleXfer *xfer = data; |
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105 | struct im_connection *ic = purple_ic_by_pa( xfer->account ); |
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106 | struct prpl_xfer_data *px = xfer->ui_data; |
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107 | PurpleBuddy *buddy; |
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108 | const char *who; |
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109 | |
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110 | buddy = purple_find_buddy( xfer->account, xfer->who ); |
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111 | who = buddy ? purple_buddy_get_name( buddy ) : xfer->who; |
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112 | |
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113 | /* TODO(wilmer): After spreading some more const goodness in BitlBee, |
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114 | remove the evil cast below. */ |
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115 | px->ft = imcb_file_send_start( ic, (char*) who, xfer->filename, xfer->size ); |
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116 | px->ft->data = px; |
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117 | |
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118 | px->ft->accept = prpl_xfer_accept; |
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119 | px->ft->canceled = prpl_xfer_canceled; |
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120 | px->ft->write_request = prpl_xfer_write_request; |
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121 | |
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122 | return FALSE; |
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123 | } |
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124 | |
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125 | gboolean try_write_to_ui( gpointer data, gint fd, b_input_condition cond ) |
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126 | { |
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127 | struct file_transfer *ft = data; |
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128 | struct prpl_xfer_data *px = ft->data; |
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129 | struct stat fs; |
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130 | off_t tx_bytes; |
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131 | |
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132 | /* If we don't have the file opened yet, there's no data so wait. */ |
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133 | if( px->fd < 0 || !px->ui_wants_data ) |
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134 | return FALSE; |
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135 | |
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136 | tx_bytes = lseek( px->fd, 0, SEEK_CUR ); |
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137 | fstat( px->fd, &fs ); |
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138 | |
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139 | if( fs.st_size > tx_bytes ) |
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140 | { |
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141 | char buf[1024]; |
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142 | size_t n = MIN( fs.st_size - tx_bytes, sizeof( buf ) ); |
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143 | |
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144 | if( read( px->fd, buf, n ) == n && ft->write( ft, buf, n ) ) |
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145 | { |
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146 | px->ui_wants_data = FALSE; |
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147 | } |
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148 | else |
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149 | { |
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150 | purple_xfer_cancel_local( px->xfer ); |
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151 | imcb_file_canceled( ft, "Read error" ); |
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152 | } |
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153 | } |
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154 | |
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155 | if( lseek( px->fd, 0, SEEK_CUR ) == px->xfer->size ) |
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156 | { |
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157 | purple_xfer_end( px->xfer ); |
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158 | imcb_file_finished( ft ); |
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159 | } |
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160 | |
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161 | return FALSE; |
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162 | } |
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163 | |
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164 | /* UI calls this when its buffer is empty and wants more data to send to the user. */ |
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165 | static gboolean prpl_xfer_write_request( struct file_transfer *ft ) |
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166 | { |
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167 | struct prpl_xfer_data *px = ft->data; |
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168 | |
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169 | px->ui_wants_data = TRUE; |
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170 | try_write_to_ui( ft, 0, 0 ); |
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171 | |
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172 | return FALSE; |
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173 | } |
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174 | |
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175 | |
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176 | /* Generic (IM<>UI): */ |
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177 | static void prplcb_xfer_destroy( PurpleXfer *xfer ) |
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178 | { |
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179 | struct prpl_xfer_data *px = xfer->ui_data; |
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180 | |
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181 | g_free( px->fn ); |
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182 | if( px->fd >= 0 ) |
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183 | close( px->fd ); |
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184 | g_free( px ); |
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185 | } |
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186 | |
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187 | static void prplcb_xfer_progress( PurpleXfer *xfer, double percent ) |
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188 | { |
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189 | struct prpl_xfer_data *px = xfer->ui_data; |
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190 | |
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191 | if( px->fd == -1 && percent > 0 ) |
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192 | { |
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193 | /* Weeeeeeeee, we're getting data! That means the file exists |
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194 | by now so open it and start sending to the UI. */ |
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195 | px->fd = open( px->fn, O_RDONLY ); |
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196 | |
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197 | /* Unlink it now, because we don't need it after this. */ |
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198 | unlink( px->fn ); |
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199 | } |
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200 | |
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201 | if( percent < 1 ) |
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202 | try_write_to_ui( px->ft, 0, 0 ); |
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203 | else |
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204 | /* Another nice problem: If we have the whole file, it only |
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205 | gets closed when we return. Problem: There may still be |
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206 | stuff buffered and not written, we'll only see it after |
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207 | the caller close()s the file. So poll the file after that. */ |
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208 | b_timeout_add( 0, try_write_to_ui, px->ft ); |
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209 | } |
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210 | |
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211 | static void prplcb_xfer_cancel_remote( PurpleXfer *xfer ) |
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212 | { |
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213 | struct prpl_xfer_data *px = xfer->ui_data; |
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214 | |
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215 | imcb_file_canceled( px->ft, "Canceled by remote end" ); |
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216 | } |
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217 | |
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218 | static void prplcb_xfer_dbg( PurpleXfer *xfer ) |
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219 | { |
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220 | fprintf( stderr, "prplcb_xfer_dbg 0x%p\n", xfer ); |
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221 | } |
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222 | |
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223 | |
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224 | /* Sending files (UI->IM): */ |
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225 | static gboolean prpl_xfer_write( struct file_transfer *ft, char *buffer, unsigned int len ) |
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226 | { |
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227 | return FALSE; |
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228 | } |
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229 | |
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230 | void purple_transfer_request( struct im_connection *ic, file_transfer_t *ft, char *handle ) |
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231 | { |
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232 | PurpleAccount *pa = ic->proto_data; |
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233 | struct prpl_xfer_data *px; |
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234 | |
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235 | /* xfer_new() will pick up this variable. It's a hack but we're not |
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236 | multi-threaded anyway. */ |
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237 | next_ft = ft; |
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238 | serv_send_file( purple_account_get_connection( pa ), handle, ft->file_name ); |
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239 | |
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240 | ft->write = prpl_xfer_write; |
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241 | |
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242 | px = ft->data; |
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243 | imcb_file_recv_start( ft ); |
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244 | } |
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245 | |
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246 | |
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247 | |
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248 | |
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249 | PurpleXferUiOps bee_xfer_uiops = |
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250 | { |
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251 | prplcb_xfer_new, |
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252 | prplcb_xfer_destroy, |
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253 | prplcb_xfer_dbg, |
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254 | prplcb_xfer_progress, |
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255 | prplcb_xfer_dbg, |
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256 | prplcb_xfer_cancel_remote, |
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257 | NULL, |
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258 | NULL, |
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259 | prplcb_xfer_dbg, |
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260 | }; |
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