Mercurial > hg > rlgwebd
annotate shterm.js @ 39:e8ac0e3d2614
RLG-Web: separate logging in and starting a game.
The user now logs in with a username and password, receiving a token
which is then used for any actions requiring authentication. Starting
a game is one such action. Games use a different set of id keys.
This allows users to supply their passwords once and then play any
number of successive games. Also, newly registered users do not need
to supply their passwords again.
author | John "Elwin" Edwards <elwin@sdf.org> |
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date | Thu, 07 Jun 2012 15:43:06 -0700 |
parents | 155f3c104759 |
children | 7a50b4412fea |
rev | line source |
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1 | 1 /* shterm.js: browser-side JavaScript to handle I/O for termemu.js when it |
2 * is running a shell via the webtty.js server. | |
3 */ | |
4 | |
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5 var nsend = 0; // The number of the next packet to send. |
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6 var nrecv = 0; // The next packet expected. |
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7 var msgQ = []; // Queue for out-of-order messages. |
13
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8 |
0
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9 // A state machine that keeps track of polling the server. |
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10 var ajaxstate = { |
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11 state: 0, |
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12 timerID: null, |
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13 clear: function () { |
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14 if (this.timerID != null) { |
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15 window.clearTimeout(this.timerID); |
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16 this.timerID = null; |
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17 } |
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18 }, |
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19 set: function (ms) { |
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20 this.clear(); |
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21 this.timerID = window.setTimeout(getData, ms); |
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22 }, |
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23 gotdata: function () { |
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24 this.set(100); |
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25 this.state = 0; |
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26 }, |
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27 gotnothing: function () { |
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28 if (this.state == 0) { |
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29 this.set(100); |
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30 this.state = 1; |
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31 } |
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32 else if (this.state == 1) { |
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33 this.set(300); |
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34 this.state = 2; |
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35 } |
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36 else if (this.state == 2) { |
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37 this.set(1000); |
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38 this.state = 3; |
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39 } |
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40 else { |
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41 this.set(5000); |
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42 this.state = 3; |
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43 } |
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44 }, |
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45 posted: function () { |
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46 this.set(100); |
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47 this.state = 0; |
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48 } |
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49 }; |
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50 |
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51 function writeData(hexstr) { |
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52 var codenum; |
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53 var codes = []; |
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54 var nc; |
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55 var u8wait = 0; /* Stores bits from previous bytes of multibyte sequences. */ |
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56 var expect = 0; /* The number of 10------ bytes expected. */ |
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57 /* UTF-8 translation. */ |
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58 for (var i = 0; i < hexstr.length; i += 2) { |
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59 nc = Number("0x" + hexstr.substr(i, 2)); |
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60 if (nc < 0x7F) { |
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61 /* 0------- */ |
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62 codes.push(nc); |
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63 /* Any incomplete sequence will be discarded. */ |
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64 u8wait = 0; |
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65 expect = 0; |
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66 } |
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67 else if (nc < 0xC0) { |
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68 /* 10------ : part of a multibyte sequence */ |
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69 if (expect > 0) { |
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70 u8wait <<= 6; |
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71 u8wait += (nc & 0x3F); |
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72 expect--; |
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73 if (expect == 0) { |
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74 codes.push(u8wait); |
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75 u8wait = 0; |
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76 } |
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77 } |
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78 else { |
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79 /* Assume an initial byte was missed. */ |
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80 u8wait = 0; |
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81 } |
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82 } |
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83 /* These will all discard any incomplete sequence. */ |
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84 else if (nc < 0xE0) { |
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85 /* 110----- : introduces 2-byte sequence */ |
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86 u8wait = (nc & 0x1F); |
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87 expect = 1; |
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88 } |
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89 else if (nc < 0xF0) { |
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90 /* 1110---- : introduces 3-byte sequence */ |
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91 u8wait = (nc & 0x0F); |
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92 expect = 2; |
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93 } |
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94 else if (nc < 0xF8) { |
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95 /* 11110--- : introduces 4-byte sequence */ |
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96 u8wait = (nc & 0x07); |
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97 expect = 3; |
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98 } |
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99 else if (nc < 0xFC) { |
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100 /* 111110-- : introduces 5-byte sequence */ |
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101 u8wait = (nc & 0x03); |
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102 expect = 4; |
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103 } |
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104 else if (nc < 0xFE) { |
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105 /* 1111110- : introduces 6-byte sequence */ |
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106 u8wait = (nc & 0x01); |
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107 expect = 5; |
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108 } |
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109 else { |
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110 /* 1111111- : should never appear */ |
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111 u8wait = 0; |
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112 expect = 0; |
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113 } |
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114 /* Supporting all 31 bits is probably overkill... */ |
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115 } |
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116 termemu.write(codes); |
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117 return; |
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118 } |
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119 |
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120 function processMsg(response) { |
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121 if (response.t != "d" || typeof(response.d) != "string") |
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122 return; |
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123 if (response.n === nrecv) { |
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124 writeData(response.d); |
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125 nrecv++; |
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126 var next; |
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127 /* msgQ must be shifted every time nrecv is incremented, but the process |
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128 * stops whenever an empty space, corresponding to an unarrived message, |
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129 * is encountered. |
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130 */ |
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131 while ((next = msgQ.shift()) !== undefined) { |
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132 writeData(next.d); |
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133 nrecv++; |
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134 } |
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135 } |
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136 else if (response.n > nrecv) { |
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137 /* The current message comes after one still missing. Queue this one |
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138 * for later use. |
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139 */ |
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140 debug(1, "Got packet " + response.n + ", expected " + nrecv); |
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141 msgQ[response.n - nrecv - 1] = response; |
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142 } |
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143 else { |
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144 /* This message's number was encountered previously. */ |
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145 debug(1, "Discarding packet " + response.n + ", expected " + nrecv); |
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146 } |
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147 } |
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148 |
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149 function getData() { |
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150 if (!termemu.alive) |
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151 return; |
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152 var datareq = new XMLHttpRequest(); |
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153 datareq.onreadystatechange = function () { |
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154 if (datareq.readyState == 4 && datareq.status == 200) { |
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155 var response = JSON.parse(this.responseText); |
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156 if (!response.t) |
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157 return; |
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158 else if (response.t == "E") { |
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159 if (response.c == 1) { |
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160 termemu.alive = false; |
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161 debug(1, "Server error: " + response.s); |
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162 } |
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163 } |
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164 else if (response.t == "n") |
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165 ajaxstate.gotnothing(); |
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166 else if (response.t == "d") { |
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167 processMsg(response); |
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168 ajaxstate.gotdata(); |
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169 } |
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170 return; |
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171 } |
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172 }; |
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173 datareq.open('GET', '/feed', true); |
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174 datareq.send(null); |
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175 return; |
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176 } |
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177 |
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178 function postResponseHandler() { |
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179 if (this.readyState == 4 && this.status == 200) { |
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180 var response = JSON.parse(this.responseText); |
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181 if (!response.t || response.t == "n") |
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182 return; |
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183 else if (response.t == "E") { |
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184 if (response.c == 1) { |
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185 termemu.alive = false; |
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186 debug(1, "Server error: " + response.s); |
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187 } |
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188 return; |
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189 } |
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190 else if (response.t != "d") |
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191 return; |
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192 /* It is a data message */ |
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193 if (response.d) { |
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194 processMsg(response); |
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195 //debug(1, "Got packet " + response.n); |
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196 } |
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197 ajaxstate.posted(); |
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198 return; |
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199 } |
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200 } |
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201 |
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202 function sendback(str) { |
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203 /* For responding to terminal queries. */ |
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204 var formdata = {"t": "d", "n": nsend++, "d": str}; |
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205 var datareq = new XMLHttpRequest(); |
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206 datareq.onreadystatechange = postResponseHandler; |
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207 datareq.open('POST', '/feed', true); |
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208 datareq.send(JSON.stringify(formdata)); |
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209 return; |
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210 } |
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211 |
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212 function sendkey(ev) { |
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213 var keynum = ev.keyCode; |
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214 var code; |
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215 if (keynum >= ev.DOM_VK_A && keynum <= ev.DOM_VK_Z) { |
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216 /* Letters. This assumes the codes are 65-90. */ |
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217 if (ev.ctrlKey) |
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218 keynum -= 64; |
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219 else if (!ev.shiftKey) |
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220 keynum += 32; |
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221 code = keynum.toString(16); |
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222 if (code.length < 2) |
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223 code = "0" + code; |
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224 } |
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225 else if (keynum >= ev.DOM_VK_0 && keynum <= ev.DOM_VK_9) { |
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226 /* The number row. */ |
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227 if (ev.shiftKey) { |
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228 code = numShifts[keynum - 48].toString(16); |
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229 } |
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230 else { |
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231 code = keynum.toString(16); |
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232 } |
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233 } |
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234 else if (keynum in keyHexCodes) { |
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235 if (ev.shiftKey) |
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236 code = keyHexCodes[keynum][1]; |
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237 else |
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238 code = keyHexCodes[keynum][0]; |
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239 } |
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240 else if (keynum == ev.DOM_VK_SHIFT || keynum == ev.DOM_VK_CONTROL || |
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241 keynum == ev.DOM_VK_ALT || keynum == ev.DOM_VK_CAPS_LOCK) { |
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242 return; |
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243 } |
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244 else { |
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245 debug(1, "Ignoring keycode " + keynum); |
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246 return; |
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247 } |
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248 if (termemu.alive) |
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249 ev.preventDefault(); |
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250 var formdata = {"t": "d", "n": nsend++, "d": code}; |
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251 var datareq = new XMLHttpRequest(); |
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252 datareq.onreadystatechange = postResponseHandler; |
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253 datareq.open('POST', '/feed', true); |
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254 datareq.send(JSON.stringify(formdata)); |
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255 //dkey(code); |
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256 return; |
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257 } |
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258 |
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259 var charshifts = { '-': "5f", '=': "2b", '[': "7b", ']': "7d", '\\': "7c", |
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260 ';': "3a", '\'': "22", ',': "3c", '.': "3e", '/': "3f", '`': "7e" |
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261 } |
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262 |
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263 function vkey(c) { |
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264 var keystr; |
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265 if (c.match(/^[a-z]$/)) { |
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266 if (termemu.ctrlp()) { |
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267 var n = c.charCodeAt(0) - 96; |
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268 keystr = n.toString(16); |
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269 if (keystr.length < 2) |
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270 keystr = "0" + keystr; |
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271 } |
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272 else if (termemu.shiftp()) |
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273 keystr = c.toUpperCase().charCodeAt(0).toString(16); |
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274 else |
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275 keystr = c.charCodeAt(0).toString(16); |
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276 } |
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277 else if (c.match(/^[0-9]$/)) { |
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278 if (termemu.shiftp()) |
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279 keystr = numShifts[c.charCodeAt(0) - 48].toString(16); |
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280 else |
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281 keystr = c.charCodeAt(0).toString(16); |
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282 } |
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283 else if (c == '\n') |
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284 keystr = "0a"; |
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285 else if (c == '\t') |
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286 keystr = "09"; |
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287 else if (c == '\b') |
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288 keystr = "08"; |
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289 else if (c == ' ') |
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290 keystr = "20"; |
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291 else if (c in charshifts) { |
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292 if (termemu.shiftp()) |
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293 keystr = charshifts[c]; |
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294 else |
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295 keystr = c.charCodeAt(0).toString(16); |
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296 } |
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297 else |
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298 return; |
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299 //writeData("Sending " + keystr); |
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300 var formdata = {"t": "d", "n": nsend++, "d": code}; |
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301 var datareq = new XMLHttpRequest(); |
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302 datareq.onreadystatechange = postResponseHandler; |
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303 datareq.open('POST', '/feed', true); |
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304 datareq.send(JSON.stringify(formdata)); |
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305 return; |
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306 } |
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307 |
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308 function setup() { |
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309 keyHexCodes.init(); |
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310 termemu.init("termwrap", 24, 80); |
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311 setTitle("Not connected."); |
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312 return; |
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313 } |
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314 |
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315 function toggleshift() { |
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316 termemu.toggleshift(); |
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317 keydiv = document.getElementById("shiftkey"); |
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318 if (termemu.shiftp()) |
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319 keydiv.className = "keysel"; |
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320 else |
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321 keydiv.className = "key"; |
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322 return; |
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323 } |
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324 |
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325 function togglectrl() { |
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326 termemu.togglectrl(); |
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327 keydiv = document.getElementById("ctrlkey"); |
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328 if (termemu.ctrlp()) |
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329 keydiv.className = "keysel"; |
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330 else |
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331 keydiv.className = "key"; |
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332 return; |
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333 } |
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334 |
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335 function login(h, w) { |
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336 if (termemu.alive) |
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337 return; |
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338 params = {"login": true, "h": h, "w": w}; |
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339 var req = new XMLHttpRequest(); |
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340 req.onreadystatechange = function () { |
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341 if (req.readyState == 4 && req.status == 200) { |
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342 var logindict = JSON.parse(req.responseText); |
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343 if (logindict.login) { |
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344 /* Success */ |
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345 termemu.resize(logindict.h, logindict.w); |
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346 termemu.alive = true; |
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347 nsend = 0; |
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348 nrecv = 0; |
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349 setTitle("Logged in"); |
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350 debug(1, "Logged in with id " + logindict.id); |
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351 getData(); |
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352 return; |
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353 } |
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354 return; |
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355 } |
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356 }; |
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357 req.open('POST', '/login', true); |
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358 req.send(JSON.stringify(params)); |
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359 //req.send("login=login&h=" + String(h) + "&w=" + String(w)); |
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360 return; |
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361 } |
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362 |
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363 function stop() { |
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364 var req = new XMLHttpRequest(); |
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365 req.onreadystatechange = function () { |
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366 if (req.readyState == 4 && req.status == 200) { |
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367 /* Figure out whether or not it worked. */ |
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368 /* FIXME the server might respond with output. */ |
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369 termemu.alive = false; |
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370 return; |
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371 } |
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372 }; |
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373 req.open('POST', '/feed', true); |
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374 req.send(JSON.stringify({"t": "q", "n": nsend++})); |
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375 return; |
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376 } |
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377 |
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378 function setTitle(tstr) { |
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379 var titlespan = document.getElementById("ttitle"); |
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380 var tnode = document.createTextNode(tstr); |
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381 if (titlespan.childNodes.length == 0) |
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382 titlespan.appendChild(tnode); |
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383 else |
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384 titlespan.replaceChild(tnode, titlespan.childNodes[0]); |
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385 return; |
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386 } |
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387 |
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388 function debug(level, msg) { |
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389 if (level < debugSuppress) |
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390 return; |
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391 var msgdiv = document.createElement("div"); |
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392 var msgtext = document.createTextNode(msg); |
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393 msgdiv.appendChild(msgtext); |
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394 document.getElementById("debug").appendChild(msgdiv); |
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395 return; |
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396 } |
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397 |
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398 /* This should be a termemu method. */ |
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399 function textsize(larger) { |
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400 var cssSize = document.getElementById("term").style.fontSize; |
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401 if (!cssSize) |
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402 return; |
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403 var match = cssSize.match(/\d*/); |
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404 if (!match) |
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405 return; |
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406 var csize = Number(match[0]); |
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407 var nsize; |
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408 if (larger) { |
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409 if (csize >= 48) |
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410 nsize = 48; |
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411 else if (csize >= 20) |
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412 nsize = csize + 4; |
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413 else if (csize >= 12) |
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414 nsize = csize + 2; |
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415 else if (csize >= 8) |
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416 nsize = csize + 1; |
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417 else |
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418 nsize = 8; |
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419 } |
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420 else { |
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421 if (csize <= 8) |
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422 nsize = 8; |
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423 else if (csize <= 12) |
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424 nsize = csize - 1; |
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425 else if (csize <= 20) |
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426 nsize = csize - 2; |
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427 else if (csize <= 48) |
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428 nsize = csize - 4; |
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429 else |
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430 nsize = 48; |
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431 } |
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432 document.getElementById("term").style.fontSize = nsize.toString() + "px"; |
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433 termemu.fixsize(); |
0
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434 debug(1, "Changing font size to " + nsize.toString()); |
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435 return; |
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436 } |
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437 |
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438 function bell(on) { |
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439 var imgnode = document.getElementById("bell"); |
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440 if (on) { |
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441 imgnode.style.visibility = "visible"; |
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442 window.setTimeout(bell, 1500, false); |
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443 } |
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444 else |
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445 imgnode.style.visibility = "hidden"; |
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446 return; |
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447 } |
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448 |
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449 function dkey(codestr) { |
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450 var dstr = "Keystring: "; |
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451 for (var i = 0; i < codestr.length; i += 2) { |
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452 code = Number("0x" + codestr.substr(i, 2)); |
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453 if (code < 32 || (code >= 127 && code < 160)) |
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454 dstr += "\\x" + code.toString(16); |
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455 else |
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456 dstr += String.fromCharCode(code); |
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457 } |
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458 debug(1, dstr); |
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459 return; |
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460 } |