548 lines
15 KiB
JavaScript
548 lines
15 KiB
JavaScript
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dojo.provide("dojox.sql._base");
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dojo.require("dojox.sql._crypto");
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dojo.mixin(dojox.sql, {
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// summary:
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// Executes a SQL expression.
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// description:
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// There are four ways to call this:
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// 1) Straight SQL: dojox.sql("SELECT * FROM FOOBAR");
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// 2) SQL with parameters: dojox.sql("INSERT INTO FOOBAR VALUES (?)", someParam)
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// 3) Encrypting particular values:
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// dojox.sql("INSERT INTO FOOBAR VALUES (ENCRYPT(?))", someParam, "somePassword", callback)
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// 4) Decrypting particular values:
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// dojox.sql("SELECT DECRYPT(SOMECOL1), DECRYPT(SOMECOL2) FROM
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// FOOBAR WHERE SOMECOL3 = ?", someParam,
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// "somePassword", callback)
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//
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// For encryption and decryption the last two values should be the the password for
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// encryption/decryption, and the callback function that gets the result set.
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//
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// Note: We only support ENCRYPT(?) statements, and
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// and DECRYPT(*) statements for now -- you can not have a literal string
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// inside of these, such as ENCRYPT('foobar')
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//
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// Note: If you have multiple columns to encrypt and decrypt, you can use the following
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// convenience form to not have to type ENCRYPT(?)/DECRYPT(*) many times:
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//
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// dojox.sql("INSERT INTO FOOBAR VALUES (ENCRYPT(?, ?, ?))",
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// someParam1, someParam2, someParam3,
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// "somePassword", callback)
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//
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// dojox.sql("SELECT DECRYPT(SOMECOL1, SOMECOL2) FROM
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// FOOBAR WHERE SOMECOL3 = ?", someParam,
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// "somePassword", callback)
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dbName: null,
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// summary:
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// If true, then we print out any SQL that is executed
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// to the debug window
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debug: (dojo.exists("dojox.sql.debug") ? dojox.sql.debug:false),
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open: function(dbName){
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if(this._dbOpen && (!dbName || dbName == this.dbName)){
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return;
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}
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if(!this.dbName){
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this.dbName = "dot_store_"
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+ window.location.href.replace(/[^0-9A-Za-z_]/g, "_");
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// database names in Gears are limited to 64 characters long
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if(this.dbName.length > 63){
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this.dbName = this.dbName.substring(0, 63);
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}
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}
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if(!dbName){
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dbName = this.dbName;
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}
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try{
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this._initDb();
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this.db.open(dbName);
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this._dbOpen = true;
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}catch(exp){
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throw exp.message||exp;
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}
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},
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close: function(dbName){
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// on Internet Explorer, Google Gears throws an exception
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// "Object not a collection", when we try to close the
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// database -- just don't close it on this platform
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// since we are running into a Gears bug; the Gears team
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// said it's ok to not close a database connection
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if(dojo.isIE){ return; }
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if(!this._dbOpen && (!dbName || dbName == this.dbName)){
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return;
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}
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if(!dbName){
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dbName = this.dbName;
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}
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try{
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this.db.close(dbName);
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this._dbOpen = false;
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}catch(exp){
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throw exp.message||exp;
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}
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},
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_exec: function(params){
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try{
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// get the Gears Database object
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this._initDb();
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// see if we need to open the db; if programmer
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// manually called dojox.sql.open() let them handle
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// it; otherwise we open and close automatically on
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// each SQL execution
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if(!this._dbOpen){
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this.open();
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this._autoClose = true;
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}
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// determine our parameters
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var sql = null;
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var callback = null;
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var password = null;
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var args = dojo._toArray(params);
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sql = args.splice(0, 1)[0];
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// does this SQL statement use the ENCRYPT or DECRYPT
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// keywords? if so, extract our callback and crypto
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// password
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if(this._needsEncrypt(sql) || this._needsDecrypt(sql)){
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callback = args.splice(args.length - 1, 1)[0];
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password = args.splice(args.length - 1, 1)[0];
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}
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// 'args' now just has the SQL parameters
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// print out debug SQL output if the developer wants that
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if(this.debug){
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this._printDebugSQL(sql, args);
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}
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// handle SQL that needs encryption/decryption differently
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// do we have an ENCRYPT SQL statement? if so, handle that first
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var crypto;
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if(this._needsEncrypt(sql)){
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crypto = new dojox.sql._SQLCrypto("encrypt", sql,
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password, args,
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callback);
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return null; // encrypted results will arrive asynchronously
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}else if(this._needsDecrypt(sql)){ // otherwise we have a DECRYPT statement
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crypto = new dojox.sql._SQLCrypto("decrypt", sql,
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password, args,
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callback);
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return null; // decrypted results will arrive asynchronously
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}
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// execute the SQL and get the results
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var rs = this.db.execute(sql, args);
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// Gears ResultSet object's are ugly -- normalize
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// these into something JavaScript programmers know
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// how to work with, basically an array of
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// JavaScript objects where each property name is
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// simply the field name for a column of data
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rs = this._normalizeResults(rs);
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if(this._autoClose){
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this.close();
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}
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return rs;
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}catch(exp){
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exp = exp.message||exp;
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console.debug("SQL Exception: " + exp);
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if(this._autoClose){
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try{
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this.close();
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}catch(e){
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console.debug("Error closing database: "
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+ e.message||e);
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}
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}
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throw exp;
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}
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return null;
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},
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_initDb: function(){
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if(!this.db){
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try{
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this.db = google.gears.factory.create('beta.database', '1.0');
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}catch(exp){
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dojo.setObject("google.gears.denied", true);
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if(dojox.off){
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dojox.off.onFrameworkEvent("coreOperationFailed");
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}
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throw "Google Gears must be allowed to run";
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}
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}
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},
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_printDebugSQL: function(sql, args){
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var msg = "dojox.sql(\"" + sql + "\"";
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for(var i = 0; i < args.length; i++){
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if(typeof args[i] == "string"){
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msg += ", \"" + args[i] + "\"";
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}else{
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msg += ", " + args[i];
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}
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}
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msg += ")";
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console.debug(msg);
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},
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_normalizeResults: function(rs){
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var results = [];
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if(!rs){ return []; }
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while(rs.isValidRow()){
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var row = {};
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for(var i = 0; i < rs.fieldCount(); i++){
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var fieldName = rs.fieldName(i);
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var fieldValue = rs.field(i);
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row[fieldName] = fieldValue;
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}
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results.push(row);
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rs.next();
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}
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rs.close();
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return results;
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},
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_needsEncrypt: function(sql){
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return /encrypt\([^\)]*\)/i.test(sql);
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},
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_needsDecrypt: function(sql){
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return /decrypt\([^\)]*\)/i.test(sql);
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}
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});
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dojo.declare("dojox.sql._SQLCrypto", null, {
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// summary:
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// A private class encapsulating any cryptography that must be done
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// on a SQL statement. We instantiate this class and have it hold
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// it's state so that we can potentially have several encryption
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// operations happening at the same time by different SQL statements.
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constructor: function(action, sql, password, args, callback){
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if(action == "encrypt"){
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this._execEncryptSQL(sql, password, args, callback);
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}else{
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this._execDecryptSQL(sql, password, args, callback);
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}
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},
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_execEncryptSQL: function(sql, password, args, callback){
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// strip the ENCRYPT/DECRYPT keywords from the SQL
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var strippedSQL = this._stripCryptoSQL(sql);
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// determine what arguments need encryption
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var encryptColumns = this._flagEncryptedArgs(sql, args);
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// asynchronously encrypt each argument that needs it
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var self = this;
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this._encrypt(strippedSQL, password, args, encryptColumns, function(finalArgs){
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// execute the SQL
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var error = false;
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var resultSet = [];
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var exp = null;
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try{
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resultSet = dojox.sql.db.execute(strippedSQL, finalArgs);
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}catch(execError){
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error = true;
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exp = execError.message||execError;
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}
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// was there an error during SQL execution?
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if(exp != null){
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if(dojox.sql._autoClose){
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try{ dojox.sql.close(); }catch(e){}
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}
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callback(null, true, exp.toString());
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return;
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}
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// normalize SQL results into a JavaScript object
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// we can work with
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resultSet = dojox.sql._normalizeResults(resultSet);
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if(dojox.sql._autoClose){
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dojox.sql.close();
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}
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// are any decryptions necessary on the result set?
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if(dojox.sql._needsDecrypt(sql)){
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// determine which of the result set columns needs decryption
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var needsDecrypt = self._determineDecryptedColumns(sql);
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// now decrypt columns asynchronously
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// decrypt columns that need it
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self._decrypt(resultSet, needsDecrypt, password, function(finalResultSet){
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callback(finalResultSet, false, null);
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});
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}else{
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callback(resultSet, false, null);
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}
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});
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},
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_execDecryptSQL: function(sql, password, args, callback){
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// strip the ENCRYPT/DECRYPT keywords from the SQL
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var strippedSQL = this._stripCryptoSQL(sql);
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// determine which columns needs decryption; this either
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// returns the value *, which means all result set columns will
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// be decrypted, or it will return the column names that need
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// decryption set on a hashtable so we can quickly test a given
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// column name; the key is the column name that needs
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// decryption and the value is 'true' (i.e. needsDecrypt["someColumn"]
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// would return 'true' if it needs decryption, and would be 'undefined'
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// or false otherwise)
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var needsDecrypt = this._determineDecryptedColumns(sql);
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// execute the SQL
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var error = false;
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var resultSet = [];
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var exp = null;
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try{
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resultSet = dojox.sql.db.execute(strippedSQL, args);
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}catch(execError){
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error = true;
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exp = execError.message||execError;
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}
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// was there an error during SQL execution?
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if(exp != null){
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if(dojox.sql._autoClose){
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try{ dojox.sql.close(); }catch(e){}
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}
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callback(resultSet, true, exp.toString());
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return;
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}
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// normalize SQL results into a JavaScript object
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// we can work with
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resultSet = dojox.sql._normalizeResults(resultSet);
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if(dojox.sql._autoClose){
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dojox.sql.close();
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}
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// decrypt columns that need it
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this._decrypt(resultSet, needsDecrypt, password, function(finalResultSet){
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callback(finalResultSet, false, null);
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});
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},
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_encrypt: function(sql, password, args, encryptColumns, callback){
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//console.debug("_encrypt, sql="+sql+", password="+password+", encryptColumns="+encryptColumns+", args="+args);
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this._totalCrypto = 0;
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this._finishedCrypto = 0;
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this._finishedSpawningCrypto = false;
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this._finalArgs = args;
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for(var i = 0; i < args.length; i++){
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if(encryptColumns[i]){
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// we have an encrypt() keyword -- get just the value inside
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// the encrypt() parantheses -- for now this must be a ?
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var sqlParam = args[i];
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var paramIndex = i;
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// update the total number of encryptions we know must be done asynchronously
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this._totalCrypto++;
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// FIXME: This currently uses DES as a proof-of-concept since the
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// DES code used is quite fast and was easy to work with. Modify dojox.sql
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// to be able to specify a different encryption provider through a
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// a SQL-like syntax, such as dojox.sql("SET ENCRYPTION BLOWFISH"),
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// and modify the dojox.crypto.Blowfish code to be able to work using
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// a Google Gears Worker Pool
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// do the actual encryption now, asychronously on a Gears worker thread
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dojox.sql._crypto.encrypt(sqlParam, password, dojo.hitch(this, function(results){
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// set the new encrypted value
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this._finalArgs[paramIndex] = results;
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this._finishedCrypto++;
|
||
|
|
// are we done with all encryption?
|
||
|
|
if(this._finishedCrypto >= this._totalCrypto
|
||
|
|
&& this._finishedSpawningCrypto){
|
||
|
|
callback(this._finalArgs);
|
||
|
|
}
|
||
|
|
}));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
this._finishedSpawningCrypto = true;
|
||
|
|
},
|
||
|
|
|
||
|
|
_decrypt: function(resultSet, needsDecrypt, password, callback){
|
||
|
|
//console.debug("decrypt, resultSet="+resultSet+", needsDecrypt="+needsDecrypt+", password="+password);
|
||
|
|
|
||
|
|
this._totalCrypto = 0;
|
||
|
|
this._finishedCrypto = 0;
|
||
|
|
this._finishedSpawningCrypto = false;
|
||
|
|
this._finalResultSet = resultSet;
|
||
|
|
|
||
|
|
for(var i = 0; i < resultSet.length; i++){
|
||
|
|
var row = resultSet[i];
|
||
|
|
|
||
|
|
// go through each of the column names in row,
|
||
|
|
// seeing if they need decryption
|
||
|
|
for(var columnName in row){
|
||
|
|
if(needsDecrypt == "*" || needsDecrypt[columnName]){
|
||
|
|
this._totalCrypto++;
|
||
|
|
var columnValue = row[columnName];
|
||
|
|
|
||
|
|
// forming a closure here can cause issues, with values not cleanly
|
||
|
|
// saved on Firefox/Mac OS X for some of the values above that
|
||
|
|
// are needed in the callback below; call a subroutine that will form
|
||
|
|
// a closure inside of itself instead
|
||
|
|
this._decryptSingleColumn(columnName, columnValue, password, i,
|
||
|
|
function(finalResultSet){
|
||
|
|
callback(finalResultSet);
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
this._finishedSpawningCrypto = true;
|
||
|
|
},
|
||
|
|
|
||
|
|
_stripCryptoSQL: function(sql){
|
||
|
|
// replace all DECRYPT(*) occurrences with a *
|
||
|
|
sql = sql.replace(/DECRYPT\(\*\)/ig, "*");
|
||
|
|
|
||
|
|
// match any ENCRYPT(?, ?, ?, etc) occurrences,
|
||
|
|
// then replace with just the question marks in the
|
||
|
|
// middle
|
||
|
|
var matches = sql.match(/ENCRYPT\([^\)]*\)/ig);
|
||
|
|
if(matches != null){
|
||
|
|
for(var i = 0; i < matches.length; i++){
|
||
|
|
var encryptStatement = matches[i];
|
||
|
|
var encryptValue = encryptStatement.match(/ENCRYPT\(([^\)]*)\)/i)[1];
|
||
|
|
sql = sql.replace(encryptStatement, encryptValue);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// match any DECRYPT(COL1, COL2, etc) occurrences,
|
||
|
|
// then replace with just the column names
|
||
|
|
// in the middle
|
||
|
|
matches = sql.match(/DECRYPT\([^\)]*\)/ig);
|
||
|
|
if(matches != null){
|
||
|
|
for(i = 0; i < matches.length; i++){
|
||
|
|
var decryptStatement = matches[i];
|
||
|
|
var decryptValue = decryptStatement.match(/DECRYPT\(([^\)]*)\)/i)[1];
|
||
|
|
sql = sql.replace(decryptStatement, decryptValue);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return sql;
|
||
|
|
},
|
||
|
|
|
||
|
|
_flagEncryptedArgs: function(sql, args){
|
||
|
|
// capture literal strings that have question marks in them,
|
||
|
|
// and also capture question marks that stand alone
|
||
|
|
var tester = new RegExp(/([\"][^\"]*\?[^\"]*[\"])|([\'][^\']*\?[^\']*[\'])|(\?)/ig);
|
||
|
|
var matches;
|
||
|
|
var currentParam = 0;
|
||
|
|
var results = [];
|
||
|
|
while((matches = tester.exec(sql)) != null){
|
||
|
|
var currentMatch = RegExp.lastMatch+"";
|
||
|
|
|
||
|
|
// are we a literal string? then ignore it
|
||
|
|
if(/^[\"\']/.test(currentMatch)){
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
// do we have an encrypt keyword to our left?
|
||
|
|
var needsEncrypt = false;
|
||
|
|
if(/ENCRYPT\([^\)]*$/i.test(RegExp.leftContext)){
|
||
|
|
needsEncrypt = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
// set the encrypted flag
|
||
|
|
results[currentParam] = needsEncrypt;
|
||
|
|
|
||
|
|
currentParam++;
|
||
|
|
}
|
||
|
|
|
||
|
|
return results;
|
||
|
|
},
|
||
|
|
|
||
|
|
_determineDecryptedColumns: function(sql){
|
||
|
|
var results = {};
|
||
|
|
|
||
|
|
if(/DECRYPT\(\*\)/i.test(sql)){
|
||
|
|
results = "*";
|
||
|
|
}else{
|
||
|
|
var tester = /DECRYPT\((?:\s*\w*\s*\,?)*\)/ig;
|
||
|
|
var matches = tester.exec(sql);
|
||
|
|
while(matches){
|
||
|
|
var lastMatch = new String(RegExp.lastMatch);
|
||
|
|
var columnNames = lastMatch.replace(/DECRYPT\(/i, "");
|
||
|
|
columnNames = columnNames.replace(/\)/, "");
|
||
|
|
columnNames = columnNames.split(/\s*,\s*/);
|
||
|
|
dojo.forEach(columnNames, function(column){
|
||
|
|
if(/\s*\w* AS (\w*)/i.test(column)){
|
||
|
|
column = column.match(/\s*\w* AS (\w*)/i)[1];
|
||
|
|
}
|
||
|
|
results[column] = true;
|
||
|
|
});
|
||
|
|
|
||
|
|
matches = tester.exec(sql)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return results;
|
||
|
|
},
|
||
|
|
|
||
|
|
_decryptSingleColumn: function(columnName, columnValue, password, currentRowIndex,
|
||
|
|
callback){
|
||
|
|
//console.debug("decryptSingleColumn, columnName="+columnName+", columnValue="+columnValue+", currentRowIndex="+currentRowIndex)
|
||
|
|
dojox.sql._crypto.decrypt(columnValue, password, dojo.hitch(this, function(results){
|
||
|
|
// set the new decrypted value
|
||
|
|
this._finalResultSet[currentRowIndex][columnName] = results;
|
||
|
|
this._finishedCrypto++;
|
||
|
|
|
||
|
|
// are we done with all encryption?
|
||
|
|
if(this._finishedCrypto >= this._totalCrypto
|
||
|
|
&& this._finishedSpawningCrypto){
|
||
|
|
//console.debug("done with all decrypts");
|
||
|
|
callback(this._finalResultSet);
|
||
|
|
}
|
||
|
|
}));
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
(function(){
|
||
|
|
|
||
|
|
var orig_sql = dojox.sql;
|
||
|
|
dojox.sql = new Function("return dojox.sql._exec(arguments);");
|
||
|
|
dojo.mixin(dojox.sql, orig_sql);
|
||
|
|
|
||
|
|
})();
|