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annotate m-toolbox/classes/+utils/@credentials/credentials.m @ 24:056f8e1e995e database-connection-manager

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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
parents 18e956c96a1b
children
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2
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 classdef credentials
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2
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3 properties
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4
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5 hostname = [];
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6 database = [];
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7 username = [];
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8 password = [];
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9 expiry = 0;
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10
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11 end % properties
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12
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13 methods
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14
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15 function obj = credentials(hostname, database, username, password)
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16 % CREDENTIALS Constructor for credentials objects.
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17 %
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18 % Those are simple container objects to hold credentials required for
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19 % establishing a connection to a database server, in addition to an
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20 % expiry time.
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21 %
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22 % CREDENTIALS(hostname, database, username, password) The constructor can
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23 % be called with any number of arguments. The default value for the object
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24 % properties is the empty vector.
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25
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26 switch nargin
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27 case 1
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28 obj.hostname = hostname;
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29 case 2
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30 obj.hostname = hostname;
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31 obj.database = database;
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32 case 3
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33 obj.hostname = hostname;
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34 obj.database = database;
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35 obj.username = username;
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36 case 4
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37 obj.hostname = hostname;
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38 obj.database = database;
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39 obj.username = username;
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40 obj.password = password;
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41 end
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42 end
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43
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44 function str = char(obj, mode)
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45 % CHAR Convert a credentials object to string representation.
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46 %
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47 % It takes an optional second argument that defines the representation to
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48 % use. The default is to replace the password, if present, with the YES
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49 % string, other possible modes are SHORT where password is omitted, or FULL
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50 % where the password is shown at it is.
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51
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52 if nargin < 2
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53 mode = '';
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54 end
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55 switch mode
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56 case 'short'
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57 % do not show password
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58 frm = 'mysql://%s/%s username=%s';
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59 str = sprintf(frm, obj.hostname, obj.database, obj.username);
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60 case 'full'
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61 % show password
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62 frm = 'mysql://%s/%s username=%s password=%s';
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63 str = sprintf(frm, obj.hostname, obj.database, obj.username, obj.password);
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64 otherwise
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65 % by default only show if a password is known
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66 passwd = [];
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67 if ischar(obj.password)
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68 passwd = 'YES';
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69 end
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70 frm = 'mysql://%s/%s username=%s password=%s';
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71 str = sprintf(frm, obj.hostname, obj.database, obj.username, passwd);
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72 end
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73 end
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74
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75 function disp(objs)
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76 % DISP Overloaded display method for credentials objects.
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77 %
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78 % Uses the default string representation of the char() method where the
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79 % password, if present, is replaced with the string YES.
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80
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81 for obj = objs
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82 disp([' ' char(obj) char(10)]);
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83 end
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84 end
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85
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86 function len = length(obj)
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87 % LENGTH Returns the number of not null fields in the object.
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88
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89 len = 0;
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90 if ~isempty(obj.hostname)
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91 len = len + 1;
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92 end
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93 if ~isempty(obj.database)
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94 len = len + 1;
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95 end
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96 if ~isempty(obj.username)
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97 len = len + 1;
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98 end
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99 if ~isempty(obj.password)
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100 len = len + 1;
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101 end
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102 end
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103
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104 function rv = complete(obj)
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105 % COMPLETE Checks if the credentials are complete.
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106 %
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107 % Credentials object are complete when they contains all the required
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108 % information to connect to a database. Namely the HOSTNAME, DATABASE
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109 % and USERNAME properties should not be empty, the PASSWORD property is
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110 % allowed to be an empty string '' but not [].
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111
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112 info = {'hostname', 'database', 'username'};
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113 for kk = 1:numel(info)
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114 if isempty(obj.(info{kk}))
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115 rv = false;
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116 return;
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117 end
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118 end
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119 if ~ischar(obj.password)
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120 rv = false;
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121 return;
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122 end
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123 rv = true;
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124 end
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125
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126 function rv = expired(obj)
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127 % EXPIRED Checks if the credentials are expired.
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128 %
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129 % Credential objects expire when their expiry time is smaller than the
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130 % current time in seconds since the epoch, as obtained by the time()
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131 % function. Credentials with zero or negative expiry time never expire.
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132
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133 rv = false;
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134 if obj.expiry > 0 && double(time()) > obj.expiry
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135 rv = true;
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136 end
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137 end
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138
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139 function rv = match(obj, hostname, database, username)
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140 % MATCH Check if the credentials object matches the given information.
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141 %
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142 % MATCH(obj, hostname) Returns true when HOSTANAME parameter match
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143 % the object properties.
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144 %
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145 % MATCH(obj, hostname, database) Returns true when HOSTANAME and
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146 % DATABASE parameters match the object properties.
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147 %
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148 % MATCH(obj, hostname, database, username) Returns true when
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149 % HOSTANAME, DATABASE, and USERNAME parameters match the object
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150 % properties.
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151
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152 % default arguments
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153 switch nargin
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154 case 4
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155 case 3
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156 username = [];
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157 case 2
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158 username = [];
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159 database = [];
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160 otherwise
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161 error('### wrong number of parameters');
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162 end
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163
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164 % default return value
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165 rv = true;
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166
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167 if ~strcmp(obj.hostname, hostname)
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168 rv = false;
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169 return;
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170 end
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171 if ischar(database) && ~strcmp(obj.database, database)
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172 rv = false;
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173 return;
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174 end
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175 if ischar(username) && ~strcmp(obj.username, username)
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176 rv = false;
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177 return;
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178 end
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179 end
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180
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181 end % methods
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182
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183 end