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qwen/nodejs/node_modules/pgpass/lib/helper.js

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+'use strict';
+
+var path = require('path')
+  , Stream = require('stream').Stream
+  , split = require('split2')
+  , util = require('util')
+  , defaultPort = 5432
+  , isWin = (process.platform === 'win32')
+  , warnStream = process.stderr
+;
+
+
+var S_IRWXG = 56     //    00070(8)
+  , S_IRWXO = 7      //    00007(8)
+  , S_IFMT  = 61440  // 00170000(8)
+  , S_IFREG = 32768  //  0100000(8)
+;
+function isRegFile(mode) {
+    return ((mode & S_IFMT) == S_IFREG);
+}
+
+var fieldNames = [ 'host', 'port', 'database', 'user', 'password' ];
+var nrOfFields = fieldNames.length;
+var passKey = fieldNames[ nrOfFields -1 ];
+
+
+function warn() {
+    var isWritable = (
+        warnStream instanceof Stream &&
+          true === warnStream.writable
+    );
+
+    if (isWritable) {
+        var args = Array.prototype.slice.call(arguments).concat("\n");
+        warnStream.write( util.format.apply(util, args) );
+    }
+}
+
+
+Object.defineProperty(module.exports, 'isWin', {
+    get : function() {
+        return isWin;
+    } ,
+    set : function(val) {
+        isWin = val;
+    }
+});
+
+
+module.exports.warnTo = function(stream) {
+    var old = warnStream;
+    warnStream = stream;
+    return old;
+};
+
+module.exports.getFileName = function(rawEnv){
+    var env = rawEnv || process.env;
+    var file = env.PGPASSFILE || (
+        isWin ?
+          path.join( env.APPDATA || './' , 'postgresql', 'pgpass.conf' ) :
+          path.join( env.HOME || './', '.pgpass' )
+    );
+    return file;
+};
+
+module.exports.usePgPass = function(stats, fname) {
+    if (Object.prototype.hasOwnProperty.call(process.env, 'PGPASSWORD')) {
+        return false;
+    }
+
+    if (isWin) {
+        return true;
+    }
+
+    fname = fname || '<unkn>';
+
+    if (! isRegFile(stats.mode)) {
+        warn('WARNING: password file "%s" is not a plain file', fname);
+        return false;
+    }
+
+    if (stats.mode & (S_IRWXG | S_IRWXO)) {
+        /* If password file is insecure, alert the user and ignore it. */
+        warn('WARNING: password file "%s" has group or world access; permissions should be u=rw (0600) or less', fname);
+        return false;
+    }
+
+    return true;
+};
+
+
+var matcher = module.exports.match = function(connInfo, entry) {
+    return fieldNames.slice(0, -1).reduce(function(prev, field, idx){
+        if (idx == 1) {
+            // the port
+            if ( Number( connInfo[field] || defaultPort ) === Number( entry[field] ) ) {
+                return prev && true;
+            }
+        }
+        return prev && (
+            entry[field] === '*' ||
+              entry[field] === connInfo[field]
+        );
+    }, true);
+};
+
+
+module.exports.getPassword = function(connInfo, stream, cb) {
+    var pass;
+    var lineStream = stream.pipe(split());
+
+    function onLine(line) {
+        var entry = parseLine(line);
+        if (entry && isValidEntry(entry) && matcher(connInfo, entry)) {
+            pass = entry[passKey];
+            lineStream.end(); // -> calls onEnd(), but pass is set now
+        }
+    }
+
+    var onEnd = function() {
+        stream.destroy();
+        cb(pass);
+    };
+
+    var onErr = function(err) {
+        stream.destroy();
+        warn('WARNING: error on reading file: %s', err);
+        cb(undefined);
+    };
+
+    stream.on('error', onErr);
+    lineStream
+        .on('data', onLine)
+        .on('end', onEnd)
+        .on('error', onErr)
+    ;
+
+};
+
+
+var parseLine = module.exports.parseLine = function(line) {
+    if (line.length < 11 || line.match(/^\s+#/)) {
+        return null;
+    }
+
+    var curChar = '';
+    var prevChar = '';
+    var fieldIdx = 0;
+    var startIdx = 0;
+    var endIdx = 0;
+    var obj = {};
+    var isLastField = false;
+    var addToObj = function(idx, i0, i1) {
+        var field = line.substring(i0, i1);
+
+        if (! Object.hasOwnProperty.call(process.env, 'PGPASS_NO_DEESCAPE')) {
+            field = field.replace(/\\([:\\])/g, '$1');
+        }
+
+        obj[ fieldNames[idx] ] = field;
+    };
+
+    for (var i = 0 ; i < line.length-1 ; i += 1) {
+        curChar = line.charAt(i+1);
+        prevChar = line.charAt(i);
+
+        isLastField = (fieldIdx == nrOfFields-1);
+
+        if (isLastField) {
+            addToObj(fieldIdx, startIdx);
+            break;
+        }
+
+        if (i >= 0 && curChar == ':' && prevChar !== '\\') {
+            addToObj(fieldIdx, startIdx, i+1);
+
+            startIdx = i+2;
+            fieldIdx += 1;
+        }
+    }
+
+    obj = ( Object.keys(obj).length === nrOfFields ) ? obj : null;
+
+    return obj;
+};
+
+
+var isValidEntry = module.exports.isValidEntry = function(entry){
+    var rules = {
+        // host
+        0 : function(x){
+            return x.length > 0;
+        } ,
+        // port
+        1 : function(x){
+            if (x === '*') {
+                return true;
+            }
+            x = Number(x);
+            return (
+                isFinite(x) &&
+                  x > 0 &&
+                  x < 9007199254740992 &&
+                  Math.floor(x) === x
+            );
+        } ,
+        // database
+        2 : function(x){
+            return x.length > 0;
+        } ,
+        // username
+        3 : function(x){
+            return x.length > 0;
+        } ,
+        // password
+        4 : function(x){
+            return x.length > 0;
+        }
+    };
+
+    for (var idx = 0 ; idx < fieldNames.length ; idx += 1) {
+        var rule = rules[idx];
+        var value = entry[ fieldNames[idx] ] || '';
+
+        var res = rule(value);
+        if (!res) {
+            return false;
+        }
+    }
+
+    return true;
+};
+