Acl parser + unit tests
This commit is contained in:
eelke
parent
b846a60f25
commit
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6 changed files with 181 additions and 0 deletions
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@ -19,5 +19,10 @@
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<PackageVersion Include="Npgsql" Version="8.0.5" />
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<PackageVersion Include="Pure.DI" Version="2.1.38" />
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<PackageVersion Include="Xamarin.AndroidX.Core.SplashScreen" Version="1.0.1.1" />
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<PackageVersion Include="coverlet.collector" Version="6.0.2"/>
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<PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.11.1"/>
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<PackageVersion Include="xunit" Version="2.9.2"/>
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<PackageVersion Include="xunit.runner.visualstudio" Version="2.8.2"/>
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</ItemGroup>
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</Project>
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17
pgLabII.PgUtils.Tests/Acls/AclParserTests.cs
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17
pgLabII.PgUtils.Tests/Acls/AclParserTests.cs
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@ -0,0 +1,17 @@
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namespace pgLabII.PgUtils.Tests;
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public class AclParserTests
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{
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[Theory]
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[InlineData("foo=rw/postgres", "foo", "rw", "postgres")]
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[InlineData("\"Test\"\"=\"=rw/postgres", "Test\"=", "rw", "postgres")]
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[InlineData("foo=rw/\"Test\"\"=\"", "foo", "rw", "Test\"=")]
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public void Test1(string aclString, string expectedGrantee, string expectedRights, string expectedGrantor)
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{
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AclParser parser = new();
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Acl acl = parser.Parse(aclString);
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Assert.Equal(expectedGrantee, acl.Grantee);
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Assert.Equal(expectedRights, acl.Rights);
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Assert.Equal(expectedGrantor, acl.Grantor);
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}
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}
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25
pgLabII.PgUtils.Tests/pgLabII.PgUtils.Tests.csproj
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25
pgLabII.PgUtils.Tests/pgLabII.PgUtils.Tests.csproj
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@ -0,0 +1,25 @@
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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net9.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<IsPackable>false</IsPackable>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="coverlet.collector" />
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<PackageReference Include="Microsoft.NET.Test.Sdk" />
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<PackageReference Include="xunit" />
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<PackageReference Include="xunit.runner.visualstudio" />
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</ItemGroup>
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<ItemGroup>
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<Using Include="Xunit" />
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</ItemGroup>
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<ItemGroup>
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<ProjectReference Include="..\pgLabII.PgUtils\pgLabII.PgUtils.csproj" />
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</ItemGroup>
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</Project>
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113
pgLabII.PgUtils/Acls/AclParser.cs
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113
pgLabII.PgUtils/Acls/AclParser.cs
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@ -0,0 +1,113 @@
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using System.Text;
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namespace pgLabII.PgUtils;
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public class Acl(string grantee, string rights, string grantor)
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{
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public string Grantee { get; } = grantee;
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public string Rights { get; } = rights;
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public string Grantor { get; } = grantor;
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}
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/// <summary>
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/// Parser for acl's. Acl's have a fairly simple structure grantee=right/grantor see also https://www.postgresql.org/docs/current/ddl-priv.html
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/// When the grantee is empty it is "PUBLIC" which you can see as a wildcard that matches everybody that can authenticate.
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/// Because the grantee and grantor name can contain special characters there is an escape mechinism in place.
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/// When the name contains a conflicting character it is quoted. If the name contains a quote it is doubles.
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/// </summary>
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public class AclParser
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{
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private int _position = 0;
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private string _input = null!;
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public Acl Parse(string acl)
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{
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_input = acl;
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_position = 0;
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ConsumeWhitespace();
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string grantee = ConsumeRoleName();
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string rights = ConsumeRights();
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if (Current() != '/')
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throw new ArgumentException("Unexpected symbol in acl string");
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_position++;
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string grantor = ConsumeRoleName();
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return new Acl(grantee, rights, grantor);
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}
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/// <summary>
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/// There is a limited set of possible characters for the rights
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/// </summary>
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/// <returns></returns>
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/// <exception cref="NotImplementedException"></exception>
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private string ConsumeRights()
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{
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if (Current() != '=')
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throw new ArgumentException("Unexpected symbol in acl string");
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_position++;
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int start = _position;
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while (NotAtEnd() && Current() != '/')
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_position++;
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return _input.Substring(start, _position - start);
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}
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// Whitespace should have been consumed
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// There should be either a " in which case the name is quoted
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// a = in which case there is no name ie PUBLIC
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// all other cases it is an unquoted name
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private string ConsumeRoleName() =>
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_input[_position] switch
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{
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'=' => "",
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'"' => ParseQuotedName(),
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_ => ParseUnquotedName()
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};
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private string ParseQuotedName()
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{
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_position++; // consume opening quote
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int start = _position;
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StringBuilder sb = new();
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while (true)
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{
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while (NotAtEnd() && Current() != '"')
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_position++;
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char peek = _position + 1 < _input.Length ? _input[_position + 1] : '\0';
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if (peek == '"')
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{
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_position++;
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sb.Append(_input.AsSpan(start, _position - start));
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_position++;
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start = _position;
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}
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else
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{
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sb.Append(_input.AsSpan(start, _position - start));
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_position++;
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break;
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}
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}
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return sb.ToString();
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}
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private string ParseUnquotedName()
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{
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int start = _position;
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while (NotAtEnd() && Current() != '=')
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_position++;
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return _input.Substring(start, _position - start);
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}
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private void ConsumeWhitespace()
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{
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while (NotAtEnd() && char.IsWhiteSpace(Current()))
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++_position;
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}
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private bool NotAtEnd() => _position < _input.Length;
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private char Current() => _input[_position];
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}
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9
pgLabII.PgUtils/pgLabII.PgUtils.csproj
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9
pgLabII.PgUtils/pgLabII.PgUtils.csproj
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@ -0,0 +1,9 @@
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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net9.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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</Project>
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12
pgLabII.sln
12
pgLabII.sln
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@ -18,6 +18,10 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
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EndProject
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Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "UI", "UI", "{EBBC2081-5061-4843-B420-AB4C48A5C283}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "pgLabII.PgUtils", "pgLabII.PgUtils\pgLabII.PgUtils.csproj", "{6694EE99-3AEA-4823-B2C3-02F28F575D14}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "pgLabII.PgUtils.Tests", "pgLabII.PgUtils.Tests\pgLabII.PgUtils.Tests.csproj", "{915C5439-4CF5-4625-AB7B-24F0E34E5B5F}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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@ -41,6 +45,14 @@ Global
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{7AD1DAC8-7FBE-49D5-8614-7321233DB82E}.Debug|Any CPU.Deploy.0 = Debug|Any CPU
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{7AD1DAC8-7FBE-49D5-8614-7321233DB82E}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{7AD1DAC8-7FBE-49D5-8614-7321233DB82E}.Release|Any CPU.Build.0 = Release|Any CPU
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{6694EE99-3AEA-4823-B2C3-02F28F575D14}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{6694EE99-3AEA-4823-B2C3-02F28F575D14}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{6694EE99-3AEA-4823-B2C3-02F28F575D14}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{6694EE99-3AEA-4823-B2C3-02F28F575D14}.Release|Any CPU.Build.0 = Release|Any CPU
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{915C5439-4CF5-4625-AB7B-24F0E34E5B5F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{915C5439-4CF5-4625-AB7B-24F0E34E5B5F}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{915C5439-4CF5-4625-AB7B-24F0E34E5B5F}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{915C5439-4CF5-4625-AB7B-24F0E34E5B5F}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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